CN100345392C - Radio communication system, device, method and computer program - Google Patents

Abstract

The invention provides radio communication system, device, method and computer program to reduce delay of communication by shortening an unstable period of communication in which communication of a channel other than a channel in scanning operation is continuously interrupted. Single scanning operation is completed in a period 1/N time as long as a transmission frame cycle and scanning for one transmission frame cycle on one channel is realized by scanning operation which is performed dispersedly N times in all channel scanning cycles. For example, (k)th scanning operation on some channel in all the channel scanning cycles is started at a temporal position (k-1)/N from the head of the transmission frame period (where, 1<k<N).

Description

Wireless communication system, radio communication device and wireless communications method

Technical field

The present invention relates to resemble wireless communication system, radio communication device and wireless communications method and the computer program that the so a plurality of air station of WLAN (local area network (LAN)) communicate each other, relate in particular to and do not dispose especially as the device of control desk but disperse to move wireless communication system, radio communication device and wireless communications method and the computer program of constructing wireless network by each called station is autonomous.

More specifically say, the present invention relates in having the communication environment of a plurality of channels, specific control desk be need not get involved and wireless communication system, radio communication device and wireless communications method and the computer program of the wireless network of autonomous decentralized formed, especially relate to the report that each called station exists assurance and network state to change by the transmission beacon, and form wireless communication system, radio communication device and wireless communications method and the computer program of the autonomous decentralized wireless network of multichannel by the scanning motion that on channel, carries out beacon.

Background technology

By with the construction of computer network headed by the LAN, can effectively realize sharing of sharing of information resource and device resource.Here, as the system of liberation user from the LAN wiring of original wired mode, WLAN receives much concern.According to WLAN, in the working space of office etc., can save a greater part of wired cable, thus the communication terminal of mobile personal computer (PC) etc. with comparalive ease.

In recent years, along with high speed, cheapization of Wireless LAN system, its demand is obviously increased.Especially, wireless network carries out information communication in order to construct on a small scale between a plurality of electronic equipments that exist around the person, and the introducing of PAN (Personal Area Network) (PAN) is discussed.For example, utilize 2.4GHz frequency band, 5GHz frequency band etc. not to need the frequency band of supervisory organ's permission to come different wireless communication system of regulation and radio communication device.

About one of standard specification of wireless network, can enumerate IEEE (The Institute ofElectrical and Electronics Engineers) 802.11 (for example with reference to non-patent literatures 1), HiperLAN/2 (for example with reference to non-patent literature 2 or 3), IEEE302.15.3, Bluetooth communication etc.About the IEEE802.11 specification,, there are various communications such as IEEE802.11a specification, IEEE802.11b specification because the frequency band of communication and use is not equal.

Usually, constitute local area network (LAN), use the device as control desk of 1 table scale for " accessing points " or " telegon (coordinator) " is set in the zone, under the unified control of this control desk, form the method for network for using wireless technology.

In the wireless network of configuration access point, when certain communicator carries out message transmission, extensively adopt at first and preengage the frequency band that this message transmission needs in accessing points, carry out the utilization of transmission path, to avoid producing the such access control method that conflicts with the message transmission of other communicators based on the frequency band reservation.That is,, carry out the communicator radio communication synchronized with each other in the wireless network by the configuration access point.

But, exist in the wireless communication system of accessing points, when between the communicator of transmitter side and receiver side, carrying out asynchronous communication, owing to need necessarily insert the radio communication of accessing points, the problem that therefore exists the utilization ratio of transmission path to reduce by half.

Different therewith, as the additive method that constitutes wireless network, consider directly non-synchronously to carry out between the terminal " special (Ad-hoc) communication " of radio communication.That is to say, think in the small-scale wireless network that the adjacent comparison minority customer facility in position becomes that do not utilize specific accessing points, the Ad-hoc communication that can carry out direct asynchronous radio communication arbitrarily between the terminal is suitable.

For example, in the Wireless LAN system according to IEEE802.11, do not dispose control desk even if having, also can autonomy the Ad-hoc pattern of equity (Peer to Peer) action dispersedly.Under this pattern, arrive the beacon transmitting time after, count each terminal at random during, under the situation of the beacon that finishes not receive before other-end during this period, self sends beacon.

On the other hand, popularize at personal computer information equipments such as (PC), mix under the operating environment of plurality of devices in the office, suppose that called station is at random, a plurality of to construct network overlappedly.Under this situation, when using the wireless network of single channel, owing to have other system incision or interference etc. to make communication quality reduce, do not repair the leeway of this state of affairs in the communication.

Therefore, in the Radio Network System originally, be applicable to, select 1 to become the multichannel mode that the frequency channels that utilizes in the radio communication device of accessing points begins to move for network coexisted and have a plurality of frequency channels with other.For example, in the standard specification of IEEE802.11h etc., the structure (DFS:Dynamic Frequency Select) of dynamic change channel is discussed.

According to this multichannel communication mode, when reducing communication quality owing to other system incision or interference etc. in the communication,, keep network action by switching the frequency channels of utilization, can realize coexistence with other networks.

Here, Ad-hoc communication waits under the wireless communications environment that each called station autonomy moves dispersedly, need each called station in accordance with regulations transmission frame period send beacon and exist and hold and the report of network state variation.That is, carry out beacon and send, on the other hand, the reception that called station regularly carries out beacon through beacon period is handled, and promptly scanning motion must receive the beacon from peripheral platform.

But, divide in the autonomous decentralized multichannel communication system of group selection communication channel by each by each called station or called station, need the time-division to receive each channel.At this moment, called station can not send reception on other channels during a certain channel of reception.Therefore, the problem that midway disconnected through the communication of being everlasting appears during this scanning motion.

Each called station only carries out in the communication system of 1 beacon transmission in each transmission frame period, if carry out scanning motion without 1 transmission frame period on each channel, then may leak and listen a beacon.

But when only carrying out the scanning motion during transmission frame continuously through a plurality of channels, the common communication during this scanning motion has disconnected midway, therefore becomes between the communication amphibolia, has increased to sending beginning expense (overhead) before.

[non-patent literature 1] International StandardISO/IEC8802-11:1999 (E) ANSI/IEEEStd802.11,1999Edition, Part11:Wireless LAN Medium AccessControl (MAC) and Physical Layer (PHY) Specifications

[non-patent literature 2] ETSI Standard ETSI TS 101761-1V1.3.1Broadband Radio Access Networks (BRAN); HIPERLANType 2; DataLink Control (DLC) Layer; Part1:Basic Data TransportFunctions

[non-patent literature 3] ETSI TS 101 761-2V1.3.1Broadband RadioAccess Networks (BRAN); HIPERLAN Type 2; DataLink Control (DLC) Layer; Part2:Radio Link Control (RLC) sublayer

Summary of the invention

The purpose of this invention is to provide a kind of device that is not configured as control desk especially, and by autonomous wireless communication system, radio communication device and wireless communications method and the computer program that disperses action to construct the excellence of wireless network of each called station.

Another object of the present invention provides a kind ofly need not insert wireless communication system, radio communication device and wireless communications method and the computer program of excellence that specific control desk just can form the wireless network of autonomous decentralized having under the communication environment of a plurality of channels.

A further object of the present invention provides and a kind ofly sends beacon by each called station and exist and hold and report that network state changes, forms wireless communication system, radio communication device and wireless communications method and the computer program of excellence of the wireless network of multichannel autonomy decentralized simultaneously by the scanning motion that carries out beacon on channel.

Another purpose of the present invention provide beyond the channel of a kind of shortening in scanning motion communication continuously, between the what is called communication amphibolia that midway disconnects, reduce wireless communication system, radio communication device and wireless communications method and the computer program of the excellence of communication delay.

To achieve these goals, the invention provides a kind of wireless communication system, in having the communication environment of a plurality of channels, the a plurality of called stations that do not have the relation of control desk and Be Controlled platform disperse to form network autonomously, it is characterized in that: each called station sends existence and the reporting ent state that beacon is held peripheral platform by transmission frame period in accordance with regulations, and, at the scanning motion of attempting dispersedly in time in the scan period on each channel, receiving than all channel that above-mentioned transmission frame period * all the number of channel is also long from the beacon signal of peripheral platform.

The present invention also provides a kind of wireless communication system, in having the communication environment of a plurality of channels, the a plurality of called stations that do not have the relation of control desk and Be Controlled platform disperse to form network autonomously, it is characterized in that: each called station sends existence and the reporting ent state that beacon is held peripheral platform by transmission frame period in accordance with regulations, on the other hand, attempt on each channel, receiving scanning motion from the beacon signal of peripheral platform, and, when being in situation about being scanned, in response to having found the other side's platform, send scan request regularly and send the beacon transmitting channel and the beacon that record this TV station, in response to receiving scan request, regularly and in the channel carrying out scanning motion by the beacon transmission of this scan request appointment.

The present invention also provides a kind of wireless communication system, in having the communication environment of a plurality of channels, the a plurality of called stations that do not have the relation of control desk and Be Controlled platform disperse to form network autonomously, it is characterized in that: each called station is held the existence of peripheral platform and the beacon that report records scanning information every the transmission frame period of regulation, and attempt receiving on each channel the scanning motion from the beacon signal of peripheral platform, wherein said scanning information comprises the channel of network state, scanning next time and scans the zero hour.

The present invention also provides a kind of and disperses the radio communication device that moves under the wireless communications environment of a plurality of channels having autonomously, it is characterized in that comprising: the communication unit that sends receiving radio data in each channel; Generation records the beacon signal generation unit of the beacon signal of the information relevant with this TV station; Analyze by the beacon signal analytic unit of above-mentioned communication unit from the beacon signal of peripheral platform reception; Set the communication channel setup unit of the communication channel of above-mentioned communication unit; The communication operation timing control unit regularly of the above-mentioned communication unit of control on the channel of being set by above-mentioned communication channel setup unit, wherein above-mentioned timing control unit is being set the scanning motion of attempting receiving the beacon signal on each channel in time dispersedly than all channel that above-mentioned transmission frame period * all the number of channel is also long in the scan period.

The present invention also provides a kind of and disperses the radio communication device that moves under the wireless communications environment of a plurality of channels having autonomously, it is characterized in that comprising: the communication unit that sends receiving radio data in each channel; Generation records the beacon signal generation unit of the beacon signal of the information relevant with this TV station; Analyze by the beacon signal analytic unit of above-mentioned communication unit from the beacon signal of peripheral platform reception; Set the communication channel setup unit of the communication channel of above-mentioned communication unit; The communication operation timing control unit regularly of the above-mentioned communication unit of control on the channel of setting by above-mentioned communication channel setup unit; Transmission records beacon transmitting channel of this TV station and the scan request unit that beacon sends scan request regularly, wherein above-mentioned communication channel setup unit and above-mentioned timing control unit regularly and in the channel are being set scanning motion respectively in response to receiving scan request by the beacon transmission of this scan request appointment.

The present invention also provides a kind of and disperses the radio communication device that moves under the wireless communications environment of a plurality of channels having autonomously, it is characterized in that comprising: the communication control unit that sends receiving radio data in each channel; Generation records the information relevant with this TV station and comprises the channel of scanning next time and the beacon signal generation unit of the beacon signal of the scanning information that scans the zero hour; Analyze by the beacon signal analytic unit of above-mentioned communication unit from the beacon signal of peripheral platform reception; Set the communication channel setup unit of the communication channel of above-mentioned communication unit; The communication operation timing control unit regularly of the above-mentioned communication unit of control on the channel of being set by above-mentioned communication channel setup unit, wherein above-mentioned timing control unit is set the timing of the scanning motion on each channel.

The present invention also provides a kind of being used for to disperse the wireless communications method that moves under the wireless communications environment of a plurality of channels having autonomously, it is characterized in that comprising: the beacon signal generation step that generates the beacon signal that records the information relevant with this TV station; Analysis is from the beacon signal analytical procedure of the beacon signal of peripheral platform reception; Set the communication channel of communication channel and set step; Be controlled at above-mentioned communication channel and set the timing controlled step of the communication operation timing on the channel of setting in the step, wherein in above-mentioned timing controlled step, setting the scanning motion of attempting receiving the beacon signal on each channel in the scan period in time dispersedly than all channel that transmission frame period * all the number of channel is also long.

The present invention also provides a kind of being used for to disperse the wireless communications method that moves under the wireless communications environment of a plurality of channels having autonomously, it is characterized in that comprising: the beacon signal generation step that generates the beacon signal that records the information relevant with this TV station; Analysis is from the beacon signal analytical procedure of the beacon signal of peripheral platform reception; Set the communication channel of communication channel and set step; Be controlled at above-mentioned communication channel and set the timing controlled step of the communication operation timing on the channel of setting in the step; Transmission records beacon transmitting channel of this TV station and the scan request step that beacon sends scan request regularly, wherein set in step and the above-mentioned timing controlled step in above-mentioned communication channel, in response to receiving scan request, regularly and in the channel setting scanning motion respectively by the beacon transmission of this scan request appointment.

The present invention also provides a kind of being used for to disperse the wireless communications method that moves under the wireless communications environment of a plurality of channels having autonomously, it is characterized in that comprising: generate and record the information relevant with this TV station and comprise the channel of scanning next time and the beacon signal generation step of the beacon signal of the scanning information of scanning zero hour; Analysis is from the beacon signal analytical procedure of the beacon signal of peripheral platform reception; Set the communication channel of communication channel and set step; Be controlled at above-mentioned communication channel and set the timing controlled step of the communication operation timing on the channel of setting in the step, wherein in above-mentioned timing controlled step, on each channel, set the timing of scanning motion.

The present invention is with reference to above-mentioned problem, its first aspect is a kind of wireless communication system, in having the communication environment of a plurality of channels, do not dispose control desk ground and form network by the autonomous dispersion of a plurality of called stations, it is characterized in that: each called station transmission frame period in accordance with regulations sends existence and the reporting ent state that beacon is held peripheral platform, and, after disperseing by the time scan period in, attempt on each channel reception from the scanning motion of the beacon signal of peripheral platform than all channel that above-mentioned transmission frame period * all the numbers of channel are long.

Wherein, said here " system " is meant multiple arrangement (or realize specific function functional module) object of set in logic, no matter whether each device and functional module be in single housing.

Under the communication environment of autonomous decentralized, each called station comprises the neighboring devices information regularly relevant with the beacon transmission with the beacon transmitting channel of peripheral platform and sends in beacon signal.That is, by the report beacon message, to the own existence of other called stations notices of adjacent (that is, communication range in), while informing network structure.Called station by receiving beacon signal, detects the communication range that has entered adjacent stations in the enterprising line scanning action of each channel, by understanding the information of putting down in writing in the beacon, can know network configuration simultaneously.

Each called station comprises the neighboring devices information regularly relevant with the beacon transmission with the beacon transmitting channel of peripheral platform and sends in beacon signal.In this case, called station is not only obtained the network information that can directly receive the adjacent stations of beacon, can obtain also that this TV station can not receive beacon but receivable adjacent stations of adjacent stations, the i.e. beacon message of (concealed terminal).

In the autonomous wireless communication system that disperses to move of each called station, need find scanning motion from the beacon signal of peripheral platform.In the multichannel environment, must carry out scanning motion by each channel time-division ground.But called station can not receive transmission on other channels during receiving a certain channel.Therefore, the problem that communication usually disconnects midway appears during this scanning motion.

Each transmission frame period of each called station only carries out must carrying out scanning motion through 1 transmission frame period on each channel in the communication system of transmission of a beacon.At this moment, when only carrying out the scanning motion during transmission frame continuously through a plurality of channels, during this scanning motion, common communication disconnects midway, has therefore increased to sending beginning expense before.

Therefore, in the wireless communication system of the present invention, after disperseing by the time in the scan period, attempt receiving the scanning motion of the beacon signal on each channel than all channel that above-mentioned transmission frame period * all the numbers of channel are long.

Therefore, during the scanning motion on each channel of all channel decentralized configuration called station in the scan period, carry out common reception standby or visit action during beyond the scanning motion.Communication beyond the channel in the scanning motion continuously, disconnect midway during shorten, disperse Tong Xin delay simultaneously (expense) minimizing between the amphibolia of communication.

According to the present invention, utilize scanning motion can measure the interference of each channel, can obtain simultaneously also being impartial effect between the test period of each channel.

Here, called station can carry out decentralized configuration at all channel with the each scanning motion on each channel as 1 transmission frame period in the scan period.

Perhaps called station is by the each scanning motion that carries out during lacking than 1 transmission frame period on each channel.At this moment, during N/one of each scanning motion, be implemented on 1 channel scanning by the scanning motion that disperses for N time in the scan period to 1 transmission frame period at above-mentioned all channel as above-mentioned transmission frame period.For example, the position after time of beginning process (k-1)/N in transmission frame period begins the k time scanning motion (wherein, the 1＜k＜N) on all channel certain channel in the scan period.

According to second side of the present invention, it is a kind of wireless communication system, in having the communication environment of a plurality of channels, do not dispose control desk ground and form network by the autonomous dispersion of a plurality of called stations, it is characterized in that: each called station transmission frame period in accordance with regulations sends existence and the reporting ent state that beacon is held peripheral platform, on the other hand, on each channel, attempt receiving scanning motion from the beacon signal of peripheral platform, simultaneously, when being in the position that is scanned, in response to finding the other side's platform, beacon transmitting channel and beacon that transmission records this TV station send scan request regularly, in response to receiving scan request, regularly and in the channel carrying out scanning motion by the beacon transmission of this scan request appointment.

The scanning motion establishing method of first side according to the present invention, by after disperseing by the time in the scan period, attempting the scanning motion of the reception of the beacon signal on each channel than all channel that transmission frame period * all the numbers of channel are long, communication beyond the channel in the scanning motion continuously, disconnect midway during shorten, disperse between the amphibolia of communication, the delay of communication simultaneously reduces.

But,, exist to begin till in fact receiving beacon, will pass through long problem from produce new beacon according to this situation disperseing under the scan condition by the time like this.

Therefore, in the wireless communication system of second side of the present invention, issue and refer to the signal of asking scanning newly adding the situation of called station by discovery the other side platforms such as reception of beacon, other groupings that fashionable grade is in the position of scanning this TV station.

The called station that is in the position that is scanned sends the beacon channel and the beacon that record this TV station and sends scan request signal regularly.And the terminal that receives this scan request signal scans in channel appointed in during the beacon delivery time that comprises the appointment of scan request signal.When carrying out scanning motion in response to scan request, beacon sends regularly clear and definite, does not therefore need to scan through 1 transmission frame, and short scan period also can.

Transmission by starting the scan request signal and peripheral platform be in response to this scanning motion like this, can be effectively scanning for beacon position only.Need not wait by the time receive, can hold beacon message earlier by regular dispersion scanning.To knowing the time shortening before of correct peripheral terminal situation, can converge to stable communications status quickly.

The 3rd side of the present invention is a kind of wireless communication system, in having the communication environment of a plurality of channels, do not dispose control desk ground and form network by the autonomous dispersion of a plurality of called stations, it is characterized in that: the transmission frame period existence of the carrying out peripheral platform report of beacon of holding and recording the scanning information of the channel that comprises network state, scanning next time and scanning zero hour in accordance with regulations of each called station, on each channel, attempt receiving simultaneously scanning motion from the beacon signal of peripheral platform.

In this case, each called station can be held each other information sweep time by the exchange beacon message.And called station is in each these information of not only upgrading when receiving beacon, and also the next scanning position of the scanning information of each called station being held by each beacon period changes to next scanning position.

Each called station upgrades the scanning information of peripheral platform one by one.And when the specific communications platform is begun to send,, at first confirm this scanning information based on this scanning information.Here, under the situation about in be judged as the channel that the other side's platform will send in scanning, can not visit, cancel this transmission, according to circumstances other called stations are begun communication.

Like this, suppressed useless visit by scanning information during the communication beginning, can prevent to occupy communication medium by unwanted signal with reference to peripheral platform.Consequently can carry out more effective communication, improve the throughput of entire system.

The 4th side of the present invention is a kind of computer program of recording and narrating with computer-reader form, disperse the processing of moving under the wireless communications environment be used for having a plurality of channels carrying out on the computer system autonomously, it is characterized in that comprising: the beacon signal generation step that generates the beacon signal that records the information relevant with this TV station; Analysis is from the beacon signal analytical procedure of the beacon signal of peripheral platform reception; Set the communication channel of communication channel and set step; The communication operation timing controlled step regularly on the channel of setting in the step is set in control by above-mentioned communication channel, in the above-mentioned timing controlled step, set the scanning motion of attempting the reception of beacon signal on each channel in the scan period on the time dispersedly at all channel longer than above-mentioned transmission frame period * whole channels.

The 5th side of the present invention is a kind of computer program of recording and narrating with computer-reader form, disperse the processing of moving under the wireless communications environment be used for having a plurality of channels carrying out on the computer system autonomously, it is characterized in that comprising: the beacon signal generation step that generates the beacon signal that records the information relevant with this TV station; Analysis is from the beacon signal analytical procedure of the beacon signal of peripheral platform reception; Set the communication channel of communication channel and set step; Control above-mentioned communication channel and set the timing controlled step of the communication operation timing on the channel of setting in the step; Transmission records beacon transmitting channel of this TV station and the scan request step that beacon sends scan request regularly, above-mentioned communication channel is set in step and the above-mentioned timing controlled step, in response to receiving scan request, regularly and in the channel setting scanning motion respectively by the beacon transmission of this scan request appointment.

The 6th side of the present invention is a kind of computer program of recording and narrating with computer-reader form, disperse the processing of moving under the wireless communications environment be used for having a plurality of channels carrying out on the computer system autonomously, it is characterized in that comprising: generate and record the information relevant and comprise the channel of scanning next time and the beacon signal generation step of the beacon signal of the scanning information of scanning zero hour with this TV station; Analysis is from the beacon signal analytical procedure of the beacon signal of peripheral platform reception; Set the communication channel of communication channel and set step; Be controlled at above-mentioned communication channel and set the timing controlled step of the communication operation timing on the channel of setting in the step, set the timing of the scanning motion on each channel in the above-mentioned timing controlled step.

The computer program of the 4th to the 6th side of the present invention is defined as the computer program that computer-reader form is recorded and narrated, so that realize predetermined processing on computer system.In other words, be installed on the computer system by the computer program with the 4th to the 6th side of the present invention, the performance synergy is moved as radio communication device on computer system.Construct wireless network by starting a plurality of such radio communication devices, can obtain the action effect identical with the wireless communication system of first to the 3rd side of the present invention.

According to the present invention, can provide each called station to send beacon and exist and hold and report that network state changes, can form wireless communication system, radio communication device and wireless communications method and the computer program of excellence of the wireless network of multichannel autonomy decentralized simultaneously by the scanning motion that on channel, carries out beacon.

In addition, according to the present invention, can provide beyond the channel that shortens in the scanning motion communication continuously, between the communication amphibolia that midway disconnects, reduce wireless communication system, radio communication device and wireless communications method and the computer program of the excellence of communication delay.

According to the present invention, even if use to disperse in the scanning communication beyond the channel continuously, the mode of off period midway, by sending scan request, can only scan specific beacon position earlier, with only find that by periodic scanning beacon compares, the beacon that can hold all mid-side nodes earlier exists.

According to the present invention, adjacent stations can be held the channel of being with and scanning sweep time each other.Consequently called station does not need the other side's platform to attempt communication on other channel in scanning, can suppress useless action.

Of the present invention have purpose, feature and advantage to be able to clearly by embodiments of the invention described later with based on the detailed description of accompanying drawing again.

Description of drawings

Fig. 1 is the figure of configuration example of the communicator of the expression wireless communication system that constitutes one embodiment of the present of invention;

Fig. 2 is the figure that modal representation constitutes as the function of the radio communication device of called station action in the wireless network of one embodiment of the present of invention;

Fig. 3 is the figure of beacon sending order of each called station of expression one embodiment of the present of invention;

Fig. 4 is the figure that the beacon on 1 channel of expression sends an example regularly;

Fig. 5 is the figure of the definition of expression class interval;

Fig. 6 is that expression is given the figure of the situation of priority to the beacon sending station;

Fig. 7 is the figure of the structure of expression transmission frame period (T_SF);

Fig. 8 is the figure of the formation example of expression beacon signal form;

Fig. 9 is that to utilize the number of channel be the figure of record example of 1 o'clock NBOI in expression;

Figure 10 is illustrated on certain frequency channels the new platform that adds to avoid the figure that sends the situation of timing with the beacon of the limit configuration self that conflicts that has beacon now according to the record limit of NBOI;

Figure 11 is that the new platform that adds of expression determines that in the roughly centre of beacon interval beacon sends the figure of situation regularly;

Figure 12 is the figure of structure of the wireless communication system of modal representation multichannel structure;

Figure 13 be illustrated in only have 4 called station A～D in the communication range, wherein called station A selects the figure of the situation of transmitting channel;

Figure 14 is illustrated in the multichannel communication system that 4 channels by channel 1～channel 4 constitute, and called station A～D disposes the figure that beacon sends situation regularly on each channel;

Figure 15 is the figure of the beacon position information under the situation of expression beacon delivery time shown in Figure 14, relative channel configuration;

Figure 16 is the figure of the beacon configuration example of each called station on the expression multichannel;

Figure 17 is the figure of expression called station at the order example of the enterprising line scanning action of each channel;

Figure 18 is the figure of expression called station at the order example of the enterprising line scanning action of each channel;

Figure 19 is the figure of expression called station at the order example of the enterprising line scanning action of each channel;

Figure 20 is the structure of scanning motion is carried out in explanation by the transmission of scan request signal figure;

Figure 21 is the figure that the expression beacon sends the relation of cycle and scan period;

Figure 22 is the figure of formation example that expression comprises the beacon message form of scanning information;

Figure 23 is that expression is used for peripheral platform upgrades the processing sequence of scanning information according to the reception of beacon message shown in Figure 22 flow chart;

Figure 24 is that expression is used for called station carries out the processing sequence of the judgement that could visit according to scanning information flow chart.

Embodiment

Explain embodiments of the invention in detail below with reference to accompanying drawing.

A. system constitutes

The communication transmission path of supposing among the present invention is wireless, and uses a plurality of frequency channels, and promptly the transmission medium of multichannel formation is constructed network between a plurality of called stations.The communication of supposing among the present invention is the communication service (traffic) that stores crossover, with the unit's of being grouped into transmission information.

Radio Network System of the present invention is the system configuration that does not dispose the autonomous decentralized of telegon (coordinator), effectively utilizes the transmission control of a plurality of channels by transmission (MAC) frame that has the time-division multiple access (TDMA) structure slowly.Each called station is according to (the carrier sense multiple access: access order Carrier Sense Multiple Access) also carries out directly non-synchronously transmitting the Ad-hoc communication of information based on CSMA.

Like this, do not dispose especially in the wireless communication system of control desk, each called station is informed the existence of oneself by report beacon message on the beacon transmitting channel of suitably selecting to adjacent (being in the communication range) other called stations, and informing network constitutes simultaneously.Each called station simultaneously, constitutes (or adding network) by understanding the information aware networks of putting down in writing in the beacon by detecting peripheral platform utilizing on the channel scanning motion and receive beacon signal.Called station sends beacon in the beginning of transmission frame period, so the transmission frame period of each channel of each called station utilization is defined by beacon interval.

Each called station is autonomous to be disperseed in the wireless communication system of action, is the beacon signal of finding from peripheral platform, need be used to attempt on channel received signal and confirm " scanning motion " of the existence of the beacon that peripheral platform sends.Called station receives during a certain channel, can not send reception on other channels.Therefore, the problem that common communication disconnects midway during this scanning motion appears.For in transmission frame period, detecting beacon, must on each channel, carry out scanning motion through 1 transmission frame period, but when only carrying out continuously the scanning motion during transmission frame through a plurality of channels, communication common during this scanning motion disconnects midway, has therefore increased to sending beginning expense before.

Therefore, in the wireless communication system of the present invention, after disperseing by the time in the scan period, attempt the scanning motion of the beacon signal on each channel than all channel that above-mentioned transmission frame period * all the numbers of channel are long.The details of this structure illustrates in the back.

Among Fig. 1, express the configuration example of the communicator of the wireless communication system that constitutes one embodiment of the present of invention.In this wireless communication system, do not dispose the specific control utmost point, autonomous action, the formation Ad-hoc network of disperseing of each communicator.Among this figure, express the situation that communicator #0 distributes at the same space to communicator #6.

Among this figure, dot the communication range of each communicator, not only can with other communication in this scope, also definition produces the scope of interference as the own signal that sends.Promptly, communicator #0 be in can with the communicator #1 that closes on, the scope of #4 communication, communicator #1 be in can with the communicator #0 that closes on, #2, the scope of #4 communication, communicator #2 be in can with the communicator #1 that closes on, #3, the scope of #6 communication, communicator #3 is in the scope that can communicate by letter with the communicator #2 that closes on, communicator #4 be in can with the communicator #0 that closes on, #1, the scope of #5 communication, communicator #5 is in the scope that can communicate by letter with the communicator #4 that closes on, and communicator #6 is in the scope that can communicate by letter with the communicator #2 that closes on.

When between certain particular communication device, communicating, exist from a communicator that becomes communication counterpart and can hear but the communicator that can not hear from another communicator i.e. " concealed terminal ".

Pattern list illustrates in the wireless network of one embodiment of the present of invention the functional structure as the radio communication device of called station action among Fig. 2.The radio communication device of this figure has under the communication environment of a plurality of channels, by carry out channel access effectively in this wireless system, can form not the network that the autonomy interfered with other wireless systems disperses.

As shown in the figure, radio communication device 100 is made of interface 101, data buffer 102, central control unit 103, beacon generation unit 104, wireless transmission unit 106, timing control unit 107, channel setting unit 108, antenna 109, radio receiving unit 110, beacon analytic unit 112 and information memory cell 113.

Interface 101 carries out the exchange of various information between the external equipment that is connected in this radio communication device 100 (for example (not shown) such as personal computer).

Before data buffer 102 is used for sending via interface 101 in the data that will send from the equipment that connects via interface 101 with via the data that wireless propagation path receives with its temporary transient storage.

The a series of information that central control unit 103 carries out radio communication device 100 one-dimensionally sends and receives the management of processing and the access control (multi channel cancellation setting and channel setting etc.) of transmission path.

The beacon signal of cycle exchange between the radio communication device of 104 generations of beacon generation unit and vicinity.Radio communication device 100 is in order to use wireless network, stipulates self self self scanning motion cycle etc. of the beacon receiving slot position from the adjacent communication device, each channel of receiving slot position, each channel of beacon sending time slots position, each channel of each channel.These information stores are at information memory cell 113, and are documented in the beacon signal with peripherad radio communication device report.About the formation of beacon signal, explanation in the back.Radio communication device 100 sends beacon signal in the beginning of transmission frame period, so the transmission frame period of each channel of radio communication device 100 utilizations is defined by beacon interval.

The modulation treatment that wireless transmission unit 106 is stipulated for the data of wireless transmission temporary transient storage in data buffer 102 and beacon signal.

Antenna 109 wireless transmission on the frequency channels of selecting is issued the signal of other radio communication devices or is collected the signal of sending here from other radio communication devices.In the present embodiment, comprise individual antenna, can walk abreast together to send receives.Can not handle a plurality of frequency channels at synchronization.

The signal of information of sending here from other radio communication devices during radio receiving unit 110 receives and handles at the appointed time and beacon etc.The wireless transmission receive mode of wireless transmission unit 106 and radio receiving unit 110 for example can adopt applicable to WLAN, be suitable for more in-plant various communication modes of communicating by letter.Specifically, can adopt UWB (ultra broadband: Ultra WideBand) mode, OFDM (Orthodoxy Frequency Division Multiplex) mode, CDMA (Code Division Multiple Access) mode etc.

When selecting the actual wireless signal that sends multichannel modes such as receiving beacon signals, packet, channel setting unit 108 utilizes channel.

Send and receive the timing controlled of wireless signal on the channel that timing control unit 107 carries out setting in channel setting unit 108.For example, self beacon of the beginning of the transmission frame period of the beacon transmitting channel of control this TV station sends regularly, the beacon from other communicators of each channel receives regularly, send with the data of other communicators and receive regularly and scanning motion cycle of each channel etc.Explain in detail the back that is set in of scanning motion.

Beacon analytic unit 112 is analyzed and can be analyzed the existence of adjacent radio communication device etc. from the beacon signal of adjacent stations reception.For example, the beacon of adjacent stations receives regularly and information such as initial channel information, neighbor beacon reception timing as the neighboring devices information stores in information memory cell 113.

Information memory cell 113 is stored in the central control unit 103 the beacon transmission timing, neighboring devices information of execution sequence order (scan and set and the program of channel setting etc.), other called stations of a series of access control action carried out etc. etc.

B. the action of the visit on the channel

In the present embodiment, the radio communication device 100 that moves as called station has a plurality of channels, is not disposing under the communication environment of specific control desk, effectively utilizes the transmission control of a plurality of channels or carries out communication operation based on the random access of CSMA/CA etc. by transmission (MAC) frame that has the time-division multiple access (TDMA) structure slowly.

Here, CSMA detects the connected mode of carrying out multiple access according to carrier wave.In the radio communication, owing to be difficult to receive the signal that self information sends, begin the self information transmission after therefore confirming not have the information of other communicators to send with the CSMA/CA mode, avoid conflict thus without CSMA/CD.

In the autonomous decentralized network of present embodiment, each called station is informed the existence of oneself by report beacon message with specific time interval on particular channel to adjacent (being in the communication range) other called stations, and informing network constitutes simultaneously.The transmission period definition of beacon is transmission frame (T_SF), for example is 40 milliseconds.The beacon transmitting channel is undertaken by channel setting unit 108.

The called station that newly enters the communication range of certain called station can detect by the reception beacon signal and enter communication range, but constitutes by understanding the information aware networks of putting down in writing in the beacon simultaneously.And regularly the beacon of this TV station is sent timing setting be can not be from the timing of peripheral platform transmission beacon on the limit synchronously with the reception of beacon lentamente on the limit.

With reference to the beacon sending order of figure 3 explanations about each called station of present embodiment.The situation of the beacon of each called station of configuration on individual channel at first is described here.

When the information that sends by beacon was 100 bits, sending the time that needs was 18 microseconds.Because 40 milliseconds are carried out 1 time and send, so the medium occupation rate of the beacon of each called station is 1/2222nd, and is very little.

Each edge of table of communicating by letter is listened to the beacon limit of periphery transmission and is slowly carried out synchronously.When newly called station occurring, the beacon that the new traffic platform is set self sends regularly, conflicts not send regularly with the beacon of existing communication platform.

When periphery did not have called station, called station 01 can suitable timing begin to send beacon.The transmission of beacon is spaced apart 40 microseconds (as mentioned above).In the example that the epimere of Fig. 2 is represented, B01 represents the beacon that sends from called station 01.

After, the beacon that the initiate called station in the communication range is set self sends regularly, with not with existing beacon configuration conflict.At this moment, each called station sends the back at beacon and just obtains the preferential zone (TGP) that utilizes at once, and therefore the beacon of each called station sends regularly and preferably disperses equably in transmission frame period on 1 channel, rather than more intensive, and efficiency of transmission is better like this.Therefore, in the present embodiment, the centre at the longest time band of beacon interval begins the beacon transmission in the scope that self can hear basically.

For example shown in the epimere among Fig. 3, only exist on the channel of called station 01 and new called station 02 occurs.At this moment, called station 02 is discerned its existence and beacon position by receiving from the beacon of called station 01, shown in second section of Fig. 3, sets own beacon in the centre of the beacon interval of called station 01 and sends regularly the transmission of beginning beacon.

In addition, new called station 03 appears.At this moment, called station 03 receive from the beacon that called station 01 and called station 02 send respectively one of at least, recognize the existence of these existing called stations.Then, shown in the 3rd section of Fig. 3, begin to send by the Centromedian timing of the beacon interval that sends from called station 01 and called station 02.

Below, according to same algorithm, when newly adding called station nearby, beacon interval narrows down at every turn.For example shown in the hypomere of Fig. 3, then the called station 04 that the occurs Centromedian timing setting beacon of press the beacon interval that called station 02 and called station 01 set respectively sends regularly, and the called station 05 of Chu Xianing is pressed the Centromedian timing setting beacon transmission timing of the beacon interval that called station 02 and called station 04 set respectively subsequently.

But for the interior beacon of frequency band (transmission frame period) does not overflow, the regulation minimum beacon is Bmin at interval, does not allow in Bmin configuration to equal or sends regularly more than 2 beacon.For example, minimum beacon interval Bmin is defined as under 2.5 milliseconds the situation in 40 milliseconds transmission frame period, and maximum only can be held 16 called stations in the scope that electric wave arrives.

Express the transmission of the beacon in a transmission frame example regularly on 1 channel among Fig. 4.Wherein shown in this figure in the example, express the effluxion of the transmission frame period of 40 milliseconds of formations, the clock and watch of turning right and taking the needle as hour hands on annulus.Configurable beacon sends position regularly and is also referred to as time slot in the transmission frame.Each called station is sending TBTT regularly (target beacon transmitting time: Target Beacon Transmission Time) deliberately depart from the some time moment of (TBTT departs from) and send from the beacon as self.

In the example shown in Figure 4,16 called stations altogether from called station 0 to called station F constitute as the node of network.As illustrating with reference to figure 3, the beacon of setting new adding platform in proper order by the Centromedian timing of the beacon interval of setting according to existing called station sends algorithm regularly, carries out beacon and disposes.When regulation Bmin is 5 milliseconds, follow 1 only configurable 16 beacon of super frame maximum.That is, the called station more than 16 can not add network.

In the present embodiment, same with the situation of IEEE802.11 mode etc., define a plurality of class intervals.As shown in Figure 5, as the class interval, frame period (Short InterFrame Space:SIFS) and long intermediate frame interval (Long Inter Frame Space:LIFS) between the definition brachymedial.

Here, when common grouping sends according to the order of CSMA, after several groupings send and finish, at first only monitor the LIFS media state,, promptly do not have the transmission signal therebetween if medium are removed, then carry out random back-off (back off), in addition, do not exist therebetween when sending signal yet, the transmission right is provided.The computational methods of random back-off value adopt method well known in the prior art.

Different therewith, when sending the high grouping of relative importance value or urgency, permission sends behind the class interval of the SIFS shorter than LIFS.Thus, the packet priority ground transmission that sends of the order of the common CSMA of the comparable basis of the grouping that urgency is high.

Importantly by the different types of class interval of definition, the length of the corresponding class interval transmission route priority of dividing into groups is additional.

In addition, in the present embodiment, except that " SIFS " and " the LIFS+ grouping retreats " as above-mentioned class interval, definition " LIFS " and " FIFS+ retreats " (FIFS: frame period Far InterFrame Space between far away).Common class interval of adopting " SIFS " and " LIFS+ retreats ", but providing to certain called station in the time band that sends priority, the class interval that other use " FIFS+ retreats " provides the platform use SIFS of priority or the class interval of LIFS mode.

Each called station sends beacon at regular intervals, but sends behind the beacon priority that transmission was provided to the platform that sends this beacon in for a moment time.Express the situation that priority is provided to the beacon sending station among Fig. 6.In this specification, this preferential section definition is the transmission assurance cycle (Transmission Guaranteed Period:TGP).

Section definition beyond the TGP is Fairly Access Period (FAP), communicates by common CSMA/CA mode between called station.Express the formation of transmission frame period (T_SF) among Fig. 7.As shown in the drawing, follow transmission from the beacon of each called station, distribute the TGP of the called station that sends this beacon, after the time through TGP length, become FAP, from FAP end in the beacon transmission of next called station.Here, express beacon and send the example of TGP that will begin in a minute afterwards, but be not limited to this, for example can begin to set the zero hour of TGP from the beacon delivery time by relative position (constantly).

Here, if investigate 1 class interval on the channel once again, each called station is for the transmission of the grouping in beacon and this TV station TGP, by the send priority that provides higher of permission by the SIFS interval.That is, when sending beacon, preferentially sent the chance of data at every turn.Among the FAP grouping FAP in addition, the interval that permission retreats by LIFS+ sends.In addition, send about the grouping in the TGP of other called stations, the interval that retreats by FIFS+ sends, and lower priority is provided.In the IEEE802.11 mode, usually FIFS+ is retreated as the class interval, but, can take this interval, can more effectively carry out transmitted in packets according to the structure of present embodiment.

In the above-mentioned explanation, illustrated that only the called station in TGP provides preferential transmission route, but the called station of also can the called station in TGP breathing out provides priority.Basically in TGP, the preferential transmission, but be not the information that maintenance sends to this called station being judged as, but from other under the situation of the information that this TV station sends, can call out (Paging) information or poll (Polling) information to these " other " input.

On the contrary, called station sent beacon, do not send under the situation of any information and do not knowing and keep other will be under the situation of the information that this TV station sends to this TV station, this called station does not communicate action, and the transmission priority that provides at TGP is provided, and does not send whatever.Like this, other called stations that TGP is not provided also can begin to send at this time band after retreating through LIFS+ or FIFS+ retreats.

As shown in Figure 7, consider that beacon sends the back at once then during the structure of TGP, it is intensive with it regularly that the beacon of each called station sends, and it would be better to that equalization scatter in transmission frame period to make efficiency of transmission better.Therefore, in the present embodiment, the centre at the longest time band of beacon interval begins the beacon transmission in scope itself that can hear basically.Certainly, also have the beacon of each called station of centralized configuration to send regularly, in remaining transmission frame period, stop to receive action, reduce device power consumption utilize method.

Express the formation example of beacon signal form among Fig. 8.As shown in the drawing, beacon signal goes up then title, the PSDU of pay(useful) load portion in the presynchronization (Preamble) of the existence that is used to inform this signal.This grouping of record expression is the information of beacon in the Title area.Record will be by the following information of beacon report in the PSDU.

TX.ADDR: the MAC Address of sending station (TX)

TOIS:TBTT departs from designator (TBTT Offser Indication Sequence)

NBOI: the runout information of neighbor beacon (Neighbor Beacon OffsetInformation)

TIM: traffic indication map (Traffic Indication Map)

PAGE: call out (Paging)

Storage decision TBTT departs from the information (for example pseudorandom series) of (above-mentioned) in the TOIS field, and what kind of TBTT depart from transmission with to represent to send regularly by the relative beacon of this beacon.By being set, departs from TBTT, 2 called stations are sending under the situation regularly at identical time slot configuration beacon on the super frame, can reduce actual beacon delivery time staggers, even if conflict with certain super frame cycle, other super frame in the cycle each called station can inquire each other beacon (or the adjacent communication platform is heard both sides' beacon), i.e. conflict of qualification.

TIM is that present this called station has the report information to the information of which called station, and by reference TIM field, receiving platform can must receive in identification itself.Paging is the predetermined field that sends among the TGP after being illustrated in the receiving platform of TIM record, and the platform of this field appointment must have the reception of TGP.Also have other fields (ETC field).

The NBOI field is to record and narrate the information of the position (time of reception) of the beacon of the receivable adjacent stations of this TV station in the transmission frame.In the present embodiment, as shown in Figure 4, owing to have the time slot of 16 beacons of maximum configured in 1 transmission frame, therefore record and narrate by the bitmap form of 16 bit long about the information of the configuration of receivable beacon.That is, be the beginning position (MSB) that benchmark is mapped to the NBOI field with the time slot of the delivery time TBTT of the regular beacon of this TV station, each time slot with other is mapped to respectively on the position, position corresponding with the relative position (departing from) of the TBTT that leaves this TV station simultaneously.Then, writing 1 on the bit position of each time slot of the transmission beacon of distributing to this TV station and receivable beacon, still is 0 on the bit position in addition.

It is the record example of the NBOI under 1 the situation that Fig. 9 represents to utilize the number of channel.In the example of this figure, called station 0 generates " 1100,0000,0100,0000 " such NBOI field.It passes on the following meaning: as shown in Figure 4, can hold in maximum that called station 0～F sets respectively under the communication environment of TBTT in each time slot of 16, called station 0 shown in Figure 3 " can receive the beacon from called station 1 and called station 9 ".That is,, under the situation that can receive beacon, mark allocation space under the situation that can not receive about corresponding to everybody of the NBOI of the relative position that receives beacon.MSB is 1 to be owing to send beacon by this TV station, is equivalent to the place that this TV station sends the moment of beacon and also is labeled.

When each called station received each other beacon signal on certain channel, based on the record of the NBOI that wherein comprises, the beacon of avoiding beacon collision and configurable beacon itself to send regularly or detect from peripheral platform on each frequency channels applicatory received regularly.

The present invention relates to the autonomous scatternet of multichannel type, the NBOI information of recording and narrating about the beacon configuration of available frequency channels is necessary, but this point has been omitted in the back.

Figure 10 is illustrated on certain frequency channels, newly adds platform and avoids and have now the situation that the beacon of the conflict limit configuration of beacon itself sends timing according to the record limit of NBOI.Each segment table among this figure illustrates the adding state of called station STA0～STA2.And the configuration status of each called station is represented in the left side of each section, and its right side is represented from the configuration of the beacon of each transmission.

Express the situation that only has called station STA0 in Figure 10 epimere.At this moment, STA0 attempts receiving beacon, but can not receive, and therefore sets suitable beacon and sends regularly, can begin beacon in response to the arrival of this timing and send.Beacon sends by per 40 milliseconds (transmission frames).At this moment, whole positions of the NBOI field of putting down in writing in the beacon that STA0 sends are 0.

The situation of the interior STA1 of adding of communication range of called station STA0 is represented in the stage casing of Figure 10.STA1 attempts receiving beacon, receives the beacon of SAT0.In addition, the position in the NBOI field of the beacon of STA0 except that the transmission position regularly of expression this TV station all is 0, therefore according to above-mentioned processing sequence, in the beacon transmission timing of the centre setting of the beacon interval of STA0 itself.

The transmission that the NBOI field of the beacon that STA1 sends will represent this TV station position and expression regularly is made as 1 from the position that the beacon of STA0 receives regularly, in addition all be 0.After STA0 also discerns beacon from STA1, be 1 with this bit position set of NBOI field.

The situation that has STA2 to add in the communication range of called station STA1 after the hypomere of Figure 10 is represented.In the example among the figure, STA0 is concealed terminal for STA2.Therefore STA2 can not discern the beacon of STA1 reception from STA0, shown in the right side, by the timed sending beacon identical with STA0, may produce conflict.

The NBOI field is used to avoid this phenomenon.At first, the NBOI field of the beacon of STA1 will represent that also the position of the timing of STA0 transmission beacon also is set at 1 except that the transmission position regularly of expression this TV station.Therefore, STA2 can not directly receive the beacon that sends as the STA0 of concealed terminal, but sends regularly according to the beacon that the beacon that receives from STA1 identifies STA0, avoids by this timed sending beacon.

Then, as shown in figure 11, at this moment, SAT2 determines that in the centre of the beacon interval of STA0 and STA1 beacon sends regularly.Certainly, will represent among the NBOI in the transmission beacon of STA2 that the position that the beacon of STA2 and STA1 sends regularly is set at 1.Avoid function by the beacon collision based on the record of this NBOI field, can hold concealed terminal, promptly the beacon position of 2 destination adjacent stations can be avoided beacon collision.

C. the action of the visit under the multichannel environment

As mentioned above, in the wireless communication system of autonomous decentralized, each called station reports in transmission frame period in the beacon message, can identify 1 network on the channel and constitute the scanning motion of beacon signal from other by carrying out.But, under the situation of the autonomous decentralized network of the multichannel of present embodiment, for shown in Figure 4 on frequency axis the structure (with reference to Figure 12) of a configuration using channel number transmission frame only.Therefore, called station carries out in exploitable channel in the scanning motion, and the beacon that needs to obtain peripheral platform sends neighboring devices information such as timing.

Under the situation of single-channel autonomous decentralized system, be included in the beacon signal by the NBOI information with bitmap form shown in Figure 9 and report, the beacon that each called station can avoid conflict and configurable self beacon sends regularly or detect peripheral platform (adjacent stations and time adjacent stations) receives regularly (above-mentioned).To this, illustrate that in multichannel communication system each called station obtains the structure of neighboring devices information.

Here, as shown in figure 13, in the multichannel communication system that 4 channels of channel 1～channel 4 constitute, only there are 4 called station A～D in the communication range, consider the wherein situation of called station A selection transmitting channel.And called station A～D disposes beacon as shown in figure 14 and sends regularly on each channel 1～4.

As shown in figure 14, each called station A～D configuration of staggering does not each other conflict with other beacon so that beacon sends regularly.Sending the channel that receives beacon for example sets respectively according to the channel quality information of peripheral platform by each called station.

On the contrary, when the minimum pitch of the channel spacing of each terminal is T_SF/8, under the situation of beacon delivery time shown in Figure 14, relative channel configuration, can hold the beacon position information into as described in Figure 15.

In the example shown in Figure 15, beacon position information has the row of configurable beacon number in transmission frame period T_SF.Its beginning row distribute the beacon of this TV station to send the position, write the beacon transmitting channel.And the beacon transmission position TBTT that each later row are distributed to this TV station is the delivery time every T_SF/8 (time slot) of benchmark, writes the channel information that sends the beacon that can not receive the relative position (departing from) of position TBTT correspondence from the beacon of this TV station.

The reception beacon of the delivery time (time slot) that beacon position information shown in Figure 15 record is suitable with each row have or not, have receivable beacon the time transmit the channel of this reception beacon, be equivalent to the adjacent communication device information NBOI under the multichannel communication environment.Each called station makes beacon position information according to this TV station receivable beacon on each channel, writes it simultaneously in beacon and reports to peripheral platform, thereby can hold adjacent communication environment.Take out beacon position information from the beacon that receives, upgrade the content of the beacon position information of this TV station.

Called station is obtained the beacon transmitting channel according to the record content of this beacon position information in each transmission frame period, after having arrived beacon and sending the time of reception, switch to this channel, and the transmission of attempting beacon receives.

Wish that beacon is configured to the delivery time separation as much as possible each other of each beacon.Why like this, to be because beacon send to receive during the preferential transmission that the back obtains the data communication of TGP carries out on the channel of beacon, but to make beacon separate the call duration time that can prolong separately as much as possible.Express the beacon configuration example of each called station on the multichannel among Figure 16.

D. the scanning motion on the multichannel

In the wireless communication system that each called station autonomy is moved dispersedly, need be used to find scanning motion from the beacon signal of peripheral platform.In the multichannel environment, must carry out scanning motion by the time-division mode on each channel.But, receive some channels during, therefore called station can not send reception on other channels, occur the problem that common communication disconnects midway.

Therefore, among the present invention, after disperseing by the time scan period in, carry out on each channel, attempting the scanning motion of reception beacon signal than all channel that transmission frame period * all the numbers of channel are also long.Consequently the communication beyond the channel in the scanning motion continuously, disconnect midway during shorten, when disperseing between the amphibolia of communication, the delay of communication reduces.The following describes the establishing method of this scanning motion.

C-1. the establishing method 1 of scanning motion:

Under the communication environment of autonomous decentralized shown in Figure 13, suppose that each called station A～D regularly sends beacon at interval with the transmission frame period T_SF of regulation respectively.Here, each called station A～D disposes beacon by timing shown in Figure 14 on each channel.

Record and narrate the information of the situation of each peripheral platform of expression from the beacon that called station sends, by the reception of this beacon, peripheral terminal is held the existence of this terminal, can know configuration state (above-mentioned) simultaneously.

Called station carries out MIN transmission by the dormancy action usually and receives action, on the other hand, by carrying out the reception action of beacon period, i.e. scanning motion termly, there is 1 time ratio to receive beacon in every several, upgrades neighboring devices information from peripheral platform.The interval that any called station is all pressed transmission frame period T_SF sends beacon, therefore receive action only continue T_SF during, can receive whole beacon that can receive.Called station in order to know initiate called station and to disappear from communication range needs this regular scanning motion.

Here, under the situation of the system that can utilize a plurality of channels, certain channel can not send reception on other channels in scanning motion problem appears.

Figure 17 represents the example of called station in the order of the enterprising line scanning action of each channel.In the example of this figure, in the multichannel of 4 channel formations, carry out scanning motion on each channel continuously.At this moment, continue the labile state of communication in only during transmission frame period (T_SF) * number of channel (4).

The expression called station is at another example of the order of the enterprising line scanning action of each channel among Figure 18.In the example, in than all channel scan period (All Channel Scan Interval) that transmission frame period * all the number of channel is also long, disperse, during configuration scanning motion on each channel shown in this figure by the time.At this moment, the scanning motion each time on each channel is as 1 transmission frame period, and all channel carries out decentralized configuration in the scan period.

According to scanning motion shown in Figure 180 collocation method regularly, the reception frequency of beacon, peripheral terminal information are upgraded identical at interval, and scanning produces communication can be scatter between amphibolia.The delay of communication also reduces.

C-2. the establishing method 2 of scanning motion:

Identical with above-mentioned C-1 item, suppose Figure 13 and communication environment shown in Figure 14.

In than all channel scan period (AllChannel Scan Interval) that transmission frame period * all the number of channel is also long, disperse by the time, during configuration scanning motion on each channel, thereby, the reception frequency of beacon, peripheral terminal information upgrade identical at interval, and scanning produces communication can be scatter between amphibolia.

In the above-mentioned example, as 1 transmission frame period, but scanning motion each time can be undertaken by the time shorter than 1 transmission frame period called station with the each scanning motion on each channel.At this moment, therefore the scanning motion on the distributed channel more can further be scatter between the communication amphibolia that scanning produces, and communication delay further reduces.

For example, during N/one of scanning motion each time as transmission frame period, all channel scan period, interior scanning motion by N dispersion carried out the scanning motion to 1 transmission frame period on 1 channel.Begin the k time the scanning motion (1＜k＜N) wherein on all channel certain channel in the scan period from the position after time of beginning process (k-1)/N in transmission frame period.

Express the another example of called station among Figure 19 in the order of the enterprising line scanning action of each channel.Shown in this figure in the example, the scanning motion on the N=2,1 channel is divided into later half 2 parts of preceding half-sum of transmission frame period.Cut apart by this, the communication on other channels disconnect continuously, midway during can shorten.Thus, discrete communication can reduce communication delay between amphibolia the time.

C-3. the establishing method 3 of scanning motion:

Establishing method according to above-mentioned scanning motion, with the scanning motion that attempt to receive the beacon signal on each channel after disperseing by the time in the scan period than all channel that transmission frame period * all the numbers of channel are also long, communication in the scanning motion beyond the channel continuously, disconnect midway during shorten, discrete communication can reduce communication delay between amphibolia the time.

But when disperseing to scan by the time like this, owing to produce new beacon, thinking has the situation of process long period before the actual reception beacon.For example, according to beacon delivery time and channel, under the poorest situation, before finishing, the scanning of not waiting until whole channels of whole period sometimes just found beacon.

Therefore, in the present embodiment, newly add called station that platform etc. is in the position that the is scanned reception by beacon and other groupings etc. and find under the situation of the other side's platform, send the signal of request scanning.

Be in the called station that is scanned position and send beacon transmitting channel and the beacon transmission scan request signal regularly that records this TV station.And, the terminal that receives this scan request signal during the beacon delivery time that comprises the appointment of scan request signal in the enterprising line scanning of channel appointed.

Here, when carrying out scanning motion in response to scan request, beacon sends regularly clear and definite, does not therefore need to scan through 1 transmission frame, can be short scan period.

Express called station among Figure 20 in response to scan request signal, carry out the situation of scanning motion by new timing from peripheral platform.

As shown in the figure, existing platform in the transmission frame of 0～3999 microsecond as 1 cycle, is set at the scanning scheduled period with the time interval of knotting in channel CH0.

Here, newly add beacon signal or other groupings that platform receives this existing platform, find to exist.New adding platform sends the beacon transmitting channel (being CH0 in the example among the figure) and the beacon that record this TV station and sends the regularly scan request signal of (example among the figure is 3500 microseconds from the beginning of transmission frame).

The other side's platform that receives this scan request signal comprising on the scan request signal channel appointed CH0 beacon delivery time (from 3500 microseconds of the beginning of transmission frame) during carry out scanning motion.Because it is clear and definite that beacon sends regularly, do not need to scan through 1 transmission frame, can set short scan period.

Like this, transmission by starting the scan request signal and peripheral platform be in response to this scanning motion, can be effectively scanning for beacon position only.In addition, need not wait, can hold beacon message earlier by the time receive by regular dispersion scanning.To knowing the time shortening before of correct peripheral terminal situation, can rapidly converge to stable communications status.

C-4. the establishing method 4 of scanning motion:

Same with above-mentioned C-3, in the multiple channel wireless communication system of autonomous decentralized control, suppose the system that carries out periodic scanning by the time dispersedly.And, as shown in figure 21, carry out 4 as beacon transmission 1 transmission frame period at interval and cut apart, in each cycle, scan by per 1/4 cycle.Therefore, the time of 4 transmission frame period of use is finished the scanning of 1 transmission frame period on 1 channel.In addition, because 4 channels are arranged,, need the time in 16 cycles for finishing whole scannings.

The beacon message form that exchanges between called station has been described, but has also added that the periodic scanning zero hour of next time and the information of other channel send here in the information that beacon sends with reference to figure 8.

Figure 22 represents to comprise the formation example of the beacon message form of scanning information.Wherein, among this figure, the field that is recited as beacon message (Beacon Information) is and the identical structure of Fig. 8 record that therefore explanation is omitted here.

The additional periodic scanning zero hour of next time and the scanning information of channel information thereof of comprising in the beacon message shown in this figure.In the illustrated embodiment,, use scanning time slot sequence number as the information that is equivalent to scan the zero hour.Scanning time slot sequence number among the corresponding Figure 21 of this sequence number.This time slot sequence number is that benchmark is considered with self beacon delivery time, therefore is engraved in the actual time of corresponding sequence number in each called station different.Therefore, the time slot sequence number of reception can consider that correct scan regularly with poor (the departing from) in relative moment of distant terminal.

Like this, each called station is held information sweep time each other, in information memory cell 113 as the adjacent position information management.In each these information of not only upgrading when receiving beacon, each called station also is altered to next scanning position by each beacon period with the next scanning position of the scanning information held.

Upgrade the processing sequence of scanning information among Figure 23 according to the reception of beacon message shown in Figure 22 with flowcharting periphery platform.This processing action realizes with the put rules into practice form of fill order program of the central control units 103 in the radio communication device 100 in practice.

When receiving beacon from peripheral platform (step S1), in beacon analytic unit 112, analyze the record content of beacon message by scanning motion etc.Then, according to the scanning information that comprises in the beacon message, the scanning information (step S2) of this periphery platform of storage in the lastest imformation memory cell 113.

Then, when the scanning of this periphery platform arrives constantly (step S3), the scanning position of next time of the scanning information held is changed to next scanning position (step S4).

Then, called station upgrades the scanning information of peripheral platform one by one, when the particular communication platform is begun to send, according to this scanning information, at first, confirms this scanning information.Here, be judged as the other side's platform in scanning, in the time of can not visiting the channel that will send, cancel this transmission, according to circumstances begin other called station communication.

Represent that with the flow chart form called station carries out visiting the processing sequence of judgement according to scanning information among Figure 24.In fact this processing action realizes with the put rules into practice form of fill order program of the central control units 103 in the radio communication device 100.

When generation requires the transmission of certain specific communications platform, at first confirm this scanning information (step S11) according to scanning information.

Here, the other side's platform begins to send (step S14) not in scanning.

On the other hand, be judged as the other side's platform in scanning, can not visit under the situation of the channel that will send, disapprove transmission, cancel this transmission (step S12).According to circumstances begin communication (step S13) to other called stations.

Like this,, suppress useless visit, can prevent to occupy communication medium by useless signal by the scanning information with reference to peripheral platform in when beginning communication.Thus, can carry out more effective communication, improve the throughput of whole system.

Abovely describe the present invention in detail with reference to specific embodiment.But those skilled in the art can carry out the correction of embodiment certainly and substitute in the scope that does not deviate from aim of the present invention.That is, under illustrative form, disclose the present invention, do not explained the record content of this specification with limiting.For judging aim of the present invention, should be with reference to the scope of the claim of putting down in writing in beginning.

Claims (24)

1. wireless communication system, in having the communication environment of a plurality of channels, a plurality of called stations that do not have the relation of control desk and Be Controlled platform disperse to form network autonomously, it is characterized in that:

Each called station sends existence and the reporting ent state that beacon is held peripheral platform by transmission frame period in accordance with regulations, and, at the scanning motion of attempting dispersedly in time in the scan period on each channel, receiving than all channel that above-mentioned transmission frame period * all the number of channel is also long from the beacon signal of peripheral platform.

2. wireless communication system according to claim 1 is characterized in that:

Called station with the each scanning motion on each channel during as 1 transmission frame period, and carry out decentralized configuration in the scan period at above-mentioned all channel.

3. wireless communication system according to claim 1 is characterized in that:

Called station carries out the each scanning motion on each channel in during shorter than 1 transmission frame period.

4. wireless communication system according to claim 3 is characterized in that:

Called station with each scanning motion during as during N/one of above-mentioned transmission frame period, and, realize the scanning of 1 transmission frame period on 1 channel at above-mentioned all channel scanning motion by having carried out disperseing for N time in the scan period.

5. wireless communication system according to claim 4 is characterized in that:

Called station begins the k time scanning motion on above-mentioned all channel certain channel in the scan period, wherein 1＜k＜N from the position after the time of beginning process (k-1)/N transmission frame period of transmitting the frame period.

6. wireless communication system, in having the communication environment of a plurality of channels, a plurality of called stations that do not have the relation of control desk and Be Controlled platform disperse to form network autonomously, it is characterized in that:

Each called station sends existence and the reporting ent state that beacon is held peripheral platform by transmission frame period in accordance with regulations, on the other hand, attempts receiving the scanning motion from the beacon signal of peripheral platform on each channel, and,

When being in situation about being scanned, in response to having found the other side's platform, send scan request regularly and send the beacon transmitting channel and the beacon that record this TV station,

In response to receiving scan request, regularly and in the channel carrying out scanning motion by the beacon transmission of this scan request appointment.

7. wireless communication system, in having the communication environment of a plurality of channels, a plurality of called stations that do not have the relation of control desk and Be Controlled platform disperse to form network autonomously, it is characterized in that:

Each called station is held the existence of peripheral platform and the beacon that report records scanning information every the transmission frame period of regulation, and attempt receiving on each channel the scanning motion from the beacon signal of peripheral platform, wherein said scanning information comprises the channel of network state, scanning next time and scans the zero hour.

8. wireless communication system according to claim 7 is characterized in that:

Called station upgrades the scanning information of peripheral platform one by one,

Confirm the scanning information of this other side's platform when the particular communication platform is begun to send, be judged as this other side's platform in scanning, under the situation that can not conduct interviews in the channel that will send, cancellation sends.

9. one kind has the radio communication device that disperses under the wireless communications environment of a plurality of channels to move autonomously, it is characterized in that comprising:

In each channel, send the communication unit of receiving radio data;

Generation records the beacon signal generation unit of the beacon signal of the information relevant with this TV station;

Analyze by the beacon signal analytic unit of above-mentioned communication unit from the beacon signal of peripheral platform reception;

Set the communication channel setup unit of the communication channel of above-mentioned communication unit;

The communication operation timing control unit regularly of the above-mentioned communication unit of control on the channel of setting by above-mentioned communication channel setup unit,

Wherein above-mentioned timing control unit is being set the scanning motion of attempting receiving the beacon signal on each channel in time dispersedly than all channel that above-mentioned transmission frame period * all the number of channel is also long in the scan period.

10. radio communication device according to claim 9 is characterized in that:

Above-mentioned timing control unit with the each scanning motion on each channel during as 1 transmission frame period, and carry out decentralized configuration in the scan period at above-mentioned all channel.

11. radio communication device according to claim 9 is characterized in that:

Above-mentioned timing control unit with the each scanning motion on each channel during as than 1 transmission frame period short during, and carry out decentralized configuration in the scan period at above-mentioned all channel.

12. radio communication device according to claim 11 is characterized in that:

Above-mentioned timing control unit with each scanning motion during as during N/one of above-mentioned transmission frame period, and set the timing of having carried out the scanning motion that disperses for N time in the scan period at above-mentioned all channel.

13. radio communication device according to claim 12 is characterized in that:

Above-mentioned timing control unit is at the k time scanning motion setting on the position after the time of beginning process (k-1)/N transmission frame period of transmitting the frame period on above-mentioned all channel certain channel in the scan period, wherein 1＜k＜N.

14. one kind has the radio communication device that disperses under the wireless communications environment of a plurality of channels to move, it is characterized in that comprising autonomously:

In each channel, send the communication unit of receiving radio data;

Generation records the beacon signal generation unit of the beacon signal of the information relevant with this TV station;

Analyze by the beacon signal analytic unit of above-mentioned communication unit from the beacon signal of peripheral platform reception;

Set the communication channel setup unit of the communication channel of above-mentioned communication unit;

The communication operation timing control unit regularly of the above-mentioned communication unit of control on the channel of setting by above-mentioned communication channel setup unit;

Transmission records beacon transmitting channel of this TV station and the scan request unit that beacon sends scan request regularly,

Wherein above-mentioned communication channel setup unit and above-mentioned timing control unit regularly and in the channel are being set scanning motion respectively in response to receiving scan request by the beacon transmission of this scan request appointment.

15. one kind has the radio communication device that disperses under the wireless communications environment of a plurality of channels to move, it is characterized in that comprising autonomously:

In each channel, send the communication control unit of receiving radio data;

Generation records the information relevant with this TV station and comprises the channel of scanning next time and the beacon signal generation unit of the beacon signal of the scanning information that scans the zero hour;

Analyze by the beacon signal analytic unit of above-mentioned communication unit from the beacon signal of peripheral platform reception;

Set the communication channel setup unit of the communication channel of above-mentioned communication unit;

The communication operation timing control unit regularly of the above-mentioned communication unit of control on the channel of setting by above-mentioned communication channel setup unit,

Wherein above-mentioned timing control unit is set the timing of the scanning motion on each channel.

16. radio communication device according to claim 15 is characterized in that:

Above-mentioned beacon signal analytic unit analysis package is contained in the scanning information in the beacon signal,

Above-mentioned communication control unit is confirmed the scanning information of this other side's platform when the particular communication platform is begun to send, be judged as this other side's platform in scanning, under the situation that can not conduct interviews in the channel that will send, and cancellation sends.

17. one kind is used for the wireless communications method that disperses under the wireless communications environment of a plurality of channels to move having, it is characterized in that comprising autonomously:

The beacon signal that generation records the beacon signal of the information relevant with this TV station generates step;

Analysis is from the beacon signal analytical procedure of the beacon signal of peripheral platform reception;

Set the communication channel of communication channel and set step;

Be controlled at above-mentioned communication channel and set the timing controlled step of the communication operation timing on the channel of setting in the step,

Wherein in above-mentioned timing controlled step, setting the scanning motion of attempting receiving the beacon signal on each channel in the scan period in time dispersedly than all channel that transmission frame period * all the number of channel is also long.

18. wireless communications method according to claim 17 is characterized in that:

In above-mentioned timing controlled step, with during the each scanning motion on each channel as 1 transmission frame period, and carry out decentralized configuration in the scan period at above-mentioned all channel.

19. wireless communications method according to claim 17 is characterized in that:

In above-mentioned timing controlled step, with during the each scanning motion on each channel as than 1 transmission frame period short during, and carry out decentralized configuration in the scan period at above-mentioned all channel.

20. wireless communications method according to claim 19 is characterized in that:

In above-mentioned timing controlled step, with during each scanning motion as during N/one of above-mentioned transmission frame period, and set the timing of having carried out the scanning motion that disperses for N time in the scan period at above-mentioned all channel.

21. wireless communications method according to claim 20 is characterized in that:

In above-mentioned timing controlled step, at the k time scanning motion setting on the position after the time of beginning process (k-1)/N transmission frame period of transmitting the frame period on above-mentioned all channel certain channel in the scan period, wherein 1＜k＜N.

22. one kind is used for the wireless communications method that disperses under the wireless communications environment of a plurality of channels to move having, it is characterized in that comprising autonomously:

The beacon signal that generation records the beacon signal of the information relevant with this TV station generates step;

Analysis is from the beacon signal analytical procedure of the beacon signal of peripheral platform reception;

Set the communication channel of communication channel and set step;

Be controlled at above-mentioned communication channel and set the timing controlled step of the communication operation timing on the channel of setting in the step;

Transmission records beacon transmitting channel of this TV station and the scan request step that beacon sends scan request regularly,

Wherein set in step and the above-mentioned timing controlled step,, regularly and in the channel setting scanning motion respectively by the beacon transmission of this scan request appointment in response to receiving scan request in above-mentioned communication channel.

23. one kind is used for the wireless communications method that disperses under the wireless communications environment of a plurality of channels to move having, it is characterized in that comprising autonomously:

Generation records the information relevant with this TV station and comprises the channel of scanning next time and the beacon signal generation step of the beacon signal of the scanning information that scans the zero hour;

Analysis is from the beacon signal analytical procedure of the beacon signal of peripheral platform reception;

Set the communication channel of communication channel and set step;

Be controlled at above-mentioned communication channel and set the timing controlled step of the communication operation timing on the channel of setting in the step,

Wherein in above-mentioned timing controlled step, on each channel, set the timing of scanning motion.

24. wireless communications method according to claim 23 is characterized in that:

Analysis package is contained in the scanning information in the beacon signal in above-mentioned beacon signal analytical procedure,

Also be included in the scanning information of confirming this other side's platform when the particular communication platform begun to send, be judged as this other side's platform Control on Communication step that cancellation sends in scanning, under the situation that can not conduct interviews in the channel that will send.

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