CN105611537B - A kind of channel multiplexing method and device of unlicensed frequency band - Google Patents
A kind of channel multiplexing method and device of unlicensed frequency band Download PDFInfo
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- CN105611537B CN105611537B CN201510958506.8A CN201510958506A CN105611537B CN 105611537 B CN105611537 B CN 105611537B CN 201510958506 A CN201510958506 A CN 201510958506A CN 105611537 B CN105611537 B CN 105611537B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
- H04W16/10—Dynamic resource partitioning
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
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Abstract
The embodiment of the invention provides the channel multiplexing methods and device of a kind of unauthorized frequency range.The specific embodiment of the method detects channel energy in the detection frame of sending cycle comprising steps of when there are data to be transmitted；When detecting channel idle, before countdown terminates, when detecting the demand signalling for participating in channel multiplexing and the first transmission time started that other base stations LAA are sent, carried out data transmission in the first transmission time started using frame is sent；If not detecting the demand signalling for the participation channel multiplexing that other base stations LAA are sent, the demand signalling for obtaining the back off time of other base stations LAA is sent to other base stations LAA；It determines the current base station LAA for participating in channel multiplexing and the second transmission time started, is carried out data transmission in the second transmission time started using frame is sent.Using the present embodiment, channel multiplexing of multiple base stations LAA in unauthorized frequency range of same operator can be realized.
Description
Technical field
The present invention relates to field of communication technology, in particular to a kind of the channel multiplexing method and device of unauthorized frequency range.
Background technique
With the sharp increase of customer service demand, the especially rise of video class business, existing LTE system is difficult to meet
User demand, it is necessary to seek new technology.It is to solve the problems, such as frequency spectrum deficiency at present that LTE is coexisted using unauthorized frequency range and with WiFi
Hot discussion object, third generation cooperative partner program 3GPP (the 3rd Generation Partnership Project)
The Realease-13 stage formally propose LAA technology as LTE use unauthorized frequency range and with the main skill of WiFi harmonious coexistence
Art.Existing LTE base station can either normally work in authorized spectrum band after using LAA system, and can shunt partial service
To LAA in unauthorized band transmissions.
Simplicity of explanation to LAA is that it can be with other WiFi fair competitions as a WiFi website, and busy channel
After can efficiently transmit data as a LTE base station.
In the prior art, in order to enable the base station LAA to compete as WiFi website, European Telecommunications Standards Institute ETSI
(European Telecommunications Standards Institute) proposes Listen Before Talk LBT (Listen
Before Talk) key technology as LAA.After LBT technology, LAA system is divided into three rings when carrying out data transmission
Section: clear channel assessment (CCA) CCA, Channel holding time COT and free time (Idle Period).When the base station LAA has data to connect
Enter channel, first by clear channel assessment (CCA) CCA, is examined within the assessment time by energy measuring ED (Energy Detection)
It surveys whether channel energy is more than threshold value, if being no more than threshold value, judges that channel can be occupied, the base station LAA starts to occupy letter
Road transmits data；If channel energy is more than threshold value, it is not take up channel (there may be WiFi website in busy channel at this time),
Just start to transmit data when detecting that channel energy is no more than threshold value.
Further, for the difference in clear channel assessment (CCA) CCA stage, above-mentioned LBT technology can be divided into 4 seed types,
It is respectively: Class1, NO LBT；Type 2, the not LBT of random back；Type 3 has random back but contention window fixed
LBT；Type 4 has the LBT of random back and contention window variation.Wherein, CCA can be divided into ICCA stage and ECCA stage, ICCA
Time span is fixed, and the time span of ECCA is different according to the difference of backoff value BO, and backoff value BO be an integer, it
The maximum value CW of value between 0~CW, this backoff value is exactly contention window.Class1 is i.e. without clear channel assessment (CCA) CCA, the base station LAA
Channel is directly accessed when there are data to need to transmit；The CCA length of type 2 is fixed, i.e., after clear channel assessment (CCA), LAA base
It stands and accesses channel；The CCA length of type 3 and 4 changes, i.e. the length of CCA according to BO value and CW value is not both that can change,
The LAA base station's access channel after clear channel assessment (CCA).
Although the transmission rate of existing LTE system can be improved in LAA technology, there is certain deficiency.For example, when one
After LAA base station's access channel, other base stations LAA of neighbouring same operator may detect that channel busy, thus freeze to detect,
Wait channel idle.And actually nearby multiple base stations LAA of same operator are can to occupy same channel in the same time
Carry out channel multiplexing.That is, existing LAA BTS channel multiplexing method cannot achieve multiple LAA of same operator
Base station concurrent multiplexing channel, channel multiplexing are inefficient.
The application designs the method that channel multiplexing is carried out between multiple base stations LAA of same operator based on type 4.
Summary of the invention
The channel multiplexing method and device for being designed to provide a kind of unauthorized frequency range of the embodiment of the present invention, Neng Goushi
Channel multiplexing of the multiple base stations LAA of existing same operator in unauthorized frequency range.
In order to achieve the above object, the invention discloses a kind of channel multiplexing methods of unauthorized frequency range, are applied to authorization
Assist the access base station LAA, comprising:
When there are data to be transmitted, channel energy is detected in the detection frame of sending cycle；Wherein, week is sent
Phase includes a detection frame, a transmission frame and a blank frame；
When detecting channel idle, back off time is determined, and data transmission countdown is started based on the back off time；
Before the countdown terminates, if receiving the demand signalling for obtaining the back off time, moved back described in transmission
Keep away the time；
When detecting the demand signalling for participating in channel multiplexing and the first transmission time started that other base stations LAA are sent,
Carried out data transmission in the first transmission time started using frame is sent；
If not receiving the demand signalling for obtaining the back off time or not detecting the participation that other base stations LAA are sent
The demand signalling of channel multiplexing sends to other base stations LAA then at the end of the countdown and obtains moving back for other base stations LAA
Keep away the demand signalling of time；
The current LAA for participating in channel multiplexing is determined according to preset rules according to the back off time that other base stations LAA return
Base station and the second transmission time started, and channel multiplexing demand signalling and the are sent to each base station LAA for participating in channel multiplexing
Two transmission time starteds；Carried out data transmission in the second transmission time started using frame is sent.
Preferably, the method also includes:
If detecting channel busy before countdown terminates, freeze the countdown, when detecting channel again
When idle, the countdown of thawing.
Preferably, the method also includes:
After countdown terminates, before the first transmission time started or the second transmission time started, if detecting channel
It is busy, then terminate the channel multiplexing process in the first transmission time started or the second transmission time started, repetition is being sent
The step of channel energy is detected in the detection frame in period.
Preferably, the method also includes:
According to the duration of contention window in a upper sending cycle, after data transmission the confirmation message number that obtains andDetermine the duration of contention window in the currently transmitted period, wherein CWiFor
The duration of contention window, CW in a upper sending cyclei+1For the duration of contention window in the currently transmitted period, α was upper transmission week
It is interim to send the ratio that the sub-frame number in frame is sent in the confirmation message number and the sending cycle obtained after intraframe data transmission
Value.
Preferably, the back off time returned according to other base stations LAA determines that current participate in is believed according to preset rules
The base station LAA of road multiplexing, comprising:
According to the back off time that other base stations LAA return, the median of other base station LAA back off times is identified；
Back off time is less than to other base stations LAA of the median, is determined as currently participating in the LAA base of channel multiplexing
It stands.
Preferably, the method also includes:
The duration for the blank frame that WiFi website carries out data transmission in sending cycle is sent out not less than sending the 5% of frame duration
Send frame duration between 1ms~10ms.
In order to achieve the above object, the invention discloses a kind of channel multiplexing devices of unauthorized frequency range, are applied to authorization
Assist the access base station LAA, comprising:
Channel detection module, for when there are data to be transmitted, in the detection frame of sending cycle to channel energy into
Row detection；Wherein, sending cycle includes a detection frame, a transmission frame and a blank frame；
Countdown module is started for when detecting channel idle, determining back off time, and based on the back off time
Data transmit countdown；
Back off time sending module, for obtaining the back off time if receiving before the countdown terminates
Demand signalling then sends the back off time；
First transmission module, for when the demand signalling and that detect participation channel multiplexing that other base stations LAA are sent
When one transmission time started, carried out data transmission in the first transmission time started using frame is sent；
Back off time asks for module, if obtaining the demand signalling of the back off time for not receiving or not detecting
The demand signalling for the participation channel multiplexing that other base stations LAA are sent is sent out then at the end of the countdown to other base stations LAA
Send the demand signalling for obtaining the back off time of other base stations LAA；
Second transmission module, the back off time for being returned according to other base stations LAA determine current according to preset rules
The base station LAA and the second transmission time started of channel multiplexing are participated in, and sends channel to each base station LAA for participating in channel multiplexing
It is multiplexed demand signalling and the second transmission time started；Carried out data transmission in the second transmission time started using frame is sent.
Preferably, described device further includes that module is freezed in countdown；
Module is freezed in the countdown, if freezed described for detecting channel busy before countdown terminates
Countdown, when detecting channel idle again, the countdown of thawing.
Preferably, described device further includes contention window determining module；
The contention window determining module obtains after data transmission for the duration according to contention window in a upper sending cycle
Confirmation message number andIt determines competing in the currently transmitted period
The duration of window is striven, wherein CWiFor the duration of contention window in a upper sending cycle, CWi+1For contention window in the currently transmitted period
Duration, α are to send in the confirmation message number and the sending cycle obtained after intraframe data transmission to send out in a upper sending cycle
Send the ratio of the sub-frame number in frame.
Preferably, second transmission module includes；
Identify that submodule, the back off time for returning according to other base stations LAA identify that other described base stations LAA are kept out of the way
The median of time；
It determines submodule, for back off time to be less than to other base stations LAA of the median, is determined as currently participating in letter
The base station LAA of road multiplexing.
As seen from the above technical solution, in the embodiment of the present invention, when detecting channel idle, terminate it in countdown
Before, when the base station LAA detects demand signalling and the first transmission time started for the participation channel multiplexing that other base stations LAA are sent
When, carry out data transmission in the first transmission time started；It detects when the demand signalling for not receiving acquisition back off time or not
When the demand signalling of the participation channel multiplexing sent to other base stations LAA, at the end of countdown, sent to other base stations LAA
The demand signalling of the back off time of other base stations LAA is obtained, and is carried out data transmission in the second transmission time started, can be realized
Multiple base stations LAA of same operator unauthorized frequency range channel multiplexing, to improve channel multiplexing efficiency.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described.It should be evident that the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of flow diagram of the channel multiplexing method of unauthorized frequency range provided in an embodiment of the present invention；
Fig. 2 is a kind of structural schematic diagram of sending cycle in the embodiment of the present invention；
The difference of transmission time started determines the schematic diagram of scheme when Fig. 3 is channel multiplexing provided in an embodiment of the present invention；
Fig. 4 is to freeze and the schematic diagram of defrosting countdown in detection process provided in an embodiment of the present invention；
Fig. 5 is another flow diagram of step S106 in Fig. 1 provided in an embodiment of the present invention；
Fig. 6 a is the flow diagram of the channel multiplexing method of another unauthorized frequency range provided in an embodiment of the present invention；
Fig. 6 b is the process schematic that the example of LAA website multipling channel provided in an embodiment of the present invention illustrates；
Fig. 7 is a kind of structural schematic diagram of the channel multiplexing device of unauthorized frequency range provided in an embodiment of the present invention；
Fig. 8 is the structural schematic diagram of the channel multiplexing device of another unauthorized frequency range provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Whole description.Obviously, described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art are obtained all without making creative work
Other embodiments shall fall within the protection scope of the present invention.
The embodiment of the invention provides the channel multiplexing methods and device of a kind of unauthorized frequency range, can be realized same operation
Channel multiplexing of the multiple base stations LAA of quotient in unauthorized frequency range.
Below by specific embodiment, the present invention is described in detail.
Referring to Fig. 1, which is that a kind of process of the channel multiplexing method of unauthorized frequency range provided in an embodiment of the present invention is shown
It is intended to, includes the following steps:
Step S101: when there are data to be transmitted, channel energy is detected in the detection frame of sending cycle.
Wherein, sending cycle includes a detection frame, a transmission frame and a blank frame, as shown in Figure 2.WiFi website
The blank frame that can use in sending cycle carries out data transmission, and in practical applications, the duration of blank frame is not less than transmission frame
The 5% of duration sends frame duration between 1ms~10ms.
Step S102: when detecting channel idle, back off time is determined, and data biography is started based on the back off time
Defeated countdown.
Specifically, when WiFi busy channel, channel energy be will increase.If detecting channel energy no more than certain threshold
Value, then can determine that channel is idle.When detecting channel idle, the base station LAA between 0~contention window obtain a number
Value, the back off time of the base station LAA is determined according to this numerical value.It is assumed that contention window is 50, a number is obtained at random from 0~50
Value 17 can then determine that the back off time of the base station LAA is 170 μ s, and the countdown since the 170 μ s according to numerical value 17.
Step S103: it before the countdown terminates, if receiving the demand signalling for obtaining the back off time, sends out
Send the back off time.
In practical applications, the communication between the different base stations LAA of same operator is carried out by X2 interface.If
The demand signalling for obtaining back off time is received by X2 interface, then explanation there are other base stations LAA to initiate channel multiplexing.
Step S104: when the demand signalling for the participation channel multiplexing for detecting the transmission of other base stations LAA and the first transmission are opened
When time beginning, carried out data transmission in the first transmission time started using frame is sent.
Step S105: if not receiving the demand signalling for obtaining the back off time or not detecting other base stations LAA
The demand signalling of the participation channel multiplexing of transmission sends to other base stations LAA then at the end of the countdown and obtains other
The demand signalling of the back off time of the base station LAA.
Step S106: the back off time returned according to other base stations LAA determines current participation channel according to preset rules
The base station LAA of multiplexing and the second transmission time started, and channel multiplexing request is sent to each base station LAA for participating in channel multiplexing
Signaling and the second transmission time started；Carried out data transmission in the second transmission time started using frame is sent.
Specifically, if the demand signalling for obtaining back off time is not received, at the end of the countdown for illustrating the base station LAA
Between earlier than same group in other base stations LAA the countdown end time；If not detecting the participation letter that other base stations LAA are sent
The demand signalling of road multiplexing then illustrates that the base station LAA does not participate in the channel multiplexing of other base stations LAA initiation.Both of which
It is to judge before countdown terminates.Therefore, meet the base station LAA do not participate in other base stations initiation channel multiplexing, with
And the base station LAA countdown rate two conditions of end first when, at the end of countdown, the base station LAA to other base stations LAA send out
Send the demand signalling for obtaining the back off time of other base stations LAA.
After the back off time for obtaining other base stations LAA, which LAA which will determine according to certain rules
Channel multiplexing is participated in base station, specifically can be there are many mode, for example, back off time can be less than to the LAA of sometime threshold value
Base station is determined as participating in the object of channel multiplexing, or all base stations LAA for returning to back off time are determined as participation channel and are answered
Object.
In order to guarantee that the base station LAA can access channel in time, in another embodiment of the present invention, correspond to Fig. 1
Shown in step S106 in embodiment of the method, determined according to the back off time that other base stations LAA return according to preset rules
The current base station LAA for participating in channel multiplexing, can carry out, detailed process includes the following steps: according to process shown in fig. 5
Step S501: the back off time returned according to other base stations LAA identifies other base station LAA back off times
Median；
Step S502: back off time is less than to other base stations LAA of the median, is determined as currently participating in channel multiplexing
The base station LAA.
In the present embodiment, as a preferable mode, the base station LAA for participating in channel multiplexing should be met certain condition,
I.e. its back off time is answered relatively small.The waiting time can be reduced in this way, accelerated data transfer process.
After the object for participating in channel multiplexing has been determined, the back off time of the object according to the participation channel multiplexing is needed, really
The fixed second transmission time started.The determination of second transmission time started, when will affect the base station LAA and WiFi website to channel occupancy
Fairness.
It is assumed that the countdown end time for the base station LAA for initiating multiplexing is determined as to transmit the time started, other participate in multiple
Data are transmitted in the base station LAA " in advance ", as shown in Figure 3.The time that the base station LAA waits in this mode is shorter, from Fig. 3 institute
The base station LAA known to showing carries out data transmission after the completion of Channel Detection almost without the time of waiting, and WiFi accesses channel
Chance will be reduced, unfair for WiFi.Channel detection process shown in Fig. 3 includes the process for carrying out channel energy detection
And the process of countdown is carried out according to back off time.
It is assumed that by the longest base station LAA of back off time (LAA2 base as shown in Figure 3 in the base station LAA for participating in channel multiplexing
Stand) the countdown end time be determined as transmit the time started, at the end of other base stations LAA need to wait for the countdown of the base station LAA2
Between arrival, thus " delaying " transmit data, as shown in Figure 3.The chance that WiFi accesses channel in this mode will will increase, compared with
A possibility that mostly considering the fairness to WiFi, but being reduction of LAA access channel.
Therefore, the fairness when base station LAA and WiFi website are to channel occupancy in order to balance transmits the time started determining
When can use " compromise " method, i.e., will participate in the average value or median of the back off time of the base station LAA of channel multiplexing,
Or the smaller value in average value and median is as the transmission time started.
As seen from the above-described embodiment, in the embodiment of the present invention, when a base station LAA detects channel idle and countdown
At the end of, channel multiplexing request is issued to other LAA, is then determined according to the back off time of other LAA and participates in channel multiplexing
The base station LAA and transmission time started.The base station LAA is counted with other base stations LAA in the identified transmission time started simultaneously
According to transmission, multiple base stations LAA of same operator are realized in the channel multiplexing of unauthorized frequency range, improve the effect of channel multiplexing
Rate.
In another embodiment of the present invention, further include in embodiment of the method shown in Fig. 1, if in countdown knot
Channel busy is detected before beam, then freezes the countdown, when detecting channel idle again, the countdown of thawing.
In schematic diagram shown in Fig. 4, in the countdown process of the base station LAA, if WiFi carries out data transmission or other operators
The base station LAA carries out data transmission, then the base station LAA detects channel busy, and countdown is freezed in the base station LAA at this time, when WiFi website
When with being channel idle after the base station the LAA completion data transmission of other operators, the base station LAA detects channel idle, then thaws
Countdown.As it can be seen that this avoidance mechanism of the base station LAA is avoided that and causes biggish interference to WiFi website, more to WiFi website
It is fair.
It in another embodiment of the present invention, further include terminating it in countdown in embodiment of the method shown in Fig. 1
Afterwards, first transmission the time started or second transmission the time started before, if detecting channel busy, terminate it is described first pass
The channel multiplexing process of defeated time started or the second transmission time started, repeat in the detection frame of sending cycle to channel energy
The step of being detected.After countdown terminates, before transmitting the time started, if detecting channel busy, letter is not participated in
Road multiplexing, terminates multiplex process, continues step S101, i.e., detect to channel energy.When detecting channel idle,
Determine back off time.From the foregoing, it can be seen that after countdown terminates, the base station LAA is not accounted for when the transmission time started has been determined
When with channel, if detecting channel busy, this channel multiplexing process is not participated in, avoids and WiFi website is interfered,
Keep multiplex process more friendly, it is more fair.
It in another embodiment of the present invention, further include being sent according to upper one in embodiment of the method shown in Fig. 1
The duration of contention window in period, after data transmission the confirmation message number that obtains andDetermine the duration of contention window in the currently transmitted period, wherein CWiFor
The duration of contention window, CW in a upper sending cyclei+1For the duration of contention window in the currently transmitted period, α was upper transmission week
It is interim to send the ratio that the sub-frame number in frame is sent in the confirmation message number and the sending cycle obtained after intraframe data transmission
Value.Contention window is the integer between 16~1024.In practical applications, when LAA access channel carry out data transmission when, in order into
One step guarantees the fairness of WiFi access channel, in embodiments of the present invention according to the confirmation message count obtained in a upper period
Amount, is adjusted the size of contention window, then from a numerical value is randomly selected between 0~contention window, is determined according to the numerical value
Back off time.Therefore, change the value of contention window, the value range of back off time can be adjusted.
In the present embodiment, the confirmation message number obtained after data transmission in a upper sending cycle can reflect user's
Data receiver situation and channel quality.As 0≤α < 0.6, illustrate the confirmation obtained after data transmission in a sending cycle
Message number is less, has the base station LAA of WiFi or other operators also occupying letter in the channel that the base station LAA carries out data transmission
Road, channel quality is poor, and the contention window of the base station LAA should double to which back off time can extend, to delay the base station LAA access letter
Road；As 0.9≤α≤1, show that the confirmation message number obtained after data transmission in a upper sending cycle is more, the base station LAA
There is no the base station the LAA busy channel of WiFi or other operators or the base station LAA to carry out data biography in the channel carried out data transmission
The time of WiFi or the base station the LAA busy channel of other operators is shorter in defeated channel, and channel quality is preferable, and contention window should subtract
Half can shorten to back off time, to accelerate LAA base station's access channel.In such manner, it is possible to improve the effect of LAA station data transmission
Rate promotes service quality, and takes into account the fairness during coexisting with WiFi website.
Referring to Fig. 6 a, which is the process of the channel multiplexing method of another unauthorized frequency range provided in an embodiment of the present invention
Schematic diagram specifically comprises the following steps:
Step S601: when there are data to be transmitted, channel energy is detected in the detection frame of sending cycle.Its
In, sending cycle includes a detection frame, a transmission frame and a blank frame.
Step S602: when detecting channel idle, back off time is determined, and data biography is started based on the back off time
Defeated countdown.
Step S603: before countdown terminates, if detecting channel busy, freeze the countdown, when again
When detecting channel idle, the countdown of thawing.
Step S604: it before the countdown terminates, if receiving the demand signalling for obtaining the back off time, sends out
The back off time is sent, step S605 is executed.
Step S605: when the demand signalling for the participation channel multiplexing for detecting the transmission of other base stations LAA and the first transmission are opened
When time beginning, step S606 is executed.
Step S606: after countdown terminates, before the first transmission time started, whether detection channel is busy, if
It detects channel busy, thens follow the steps S601；If not detecting channel busy, S607 is thened follow the steps.
Step S607: carried out data transmission in the first transmission time started using frame is sent, execute step S612.
Step S608: before countdown terminates, if not receiving the demand signalling for obtaining the back off time, or do not have
The demand signalling for detecting the participation channel multiplexing that other base stations LAA are sent, the then at the end of countdown, to other LAA
Base station sends the demand signalling for obtaining the back off time of other base stations LAA, executes step S609.
Step S609: the back off time returned according to other base stations LAA determines current participation channel according to preset rules
The base station LAA of multiplexing and the second transmission time started, and channel multiplexing request is sent to each base station LAA for participating in channel multiplexing
Signaling and the second transmission time started, execute step S610.
Step S610: after countdown terminates, before the second transmission time started, whether detection channel is busy, if
It detects channel busy, thens follow the steps S601；If not detecting channel busy, S611 is thened follow the steps.
Step S611: carried out data transmission in the second transmission time started using frame is sent, execute step S612.
Step S612: according to the duration of contention window in sending cycle, after data transmission the confirmation message number that obtains and
Preset formulaDetermine contention window in next sending cycle when
It is long.Wherein CWi+1For the duration of contention window in next sending cycle, CWiFor the duration of contention window in the currently transmitted period, α is
The son sent in frame in the confirmation message number and the sending cycle obtained after intraframe data transmission is sent in the currently transmitted period
The ratio of number of frames.Contention window is the integer between 16~1024.
By above content as it can be seen that when a base station LAA detect channel idle and countdown at the end of and other LAA
In determining transmission time started common multipling channel, the multiplexing between multiple LAA of same operator is realized, letter is improved
The multiplexing efficiency in road.Meanwhile the channel detection process and avoidance mechanism of the base station LAA and the adjustment process of contention window effectively avoid
Interference to WiFi makes the base station LAA higher using unauthorized band transmissions data age rates, more friendly.
Below by an example, then the present invention is described in detail, and detailed process is as shown in Figure 6 b.
It is assumed that there are data to be transmitted for 3 base stations LAA, three base stations LAA are indicated with LAA1, LAA2, LAA3 respectively, 3
The initial contention window of a base station LAA is 32.Send the when a length of 10ms of frame, the when a length of 1ms of blank frame.
Stage 1:LAA1, LAA2, LAA3 detect channel, while WiFi is also in detection channel.3 base station LAA inspections at this time
Channel idle is measured, is 100 μ s, 180 μ s, 280 μ s respectively according to the back off time that contention window determines, and is based on the back off time
Start countdown.
LAA1 rate end first countdown, therefore LAA1 is issued to LAA2 and LAA3 by X2 interface and is obtained current back off time
Demand signalling；Two back off times that the LAA2 and LAA3 that LAA1 is obtained are returned are respectively 80 μ s and 180 μ s, according to default rule
Then, the median of the back off time of LAA2, LAA3 is found out, in this example, there are two medians, its average value can be taken as most
Whole median, i.e. (80+180)/2=130 μ s.LAA2 by back off time less than 130 μ s of median is determined as currently participating in
The base station LAA of channel multiplexing, and channel multiplexing demand signalling and transmission time started T are sent to LAA2, T, which takes, currently participates in channel
The average value of the back off time of all LAA of multiplexing starts after i.e. (0+80)/2=40 μ s to transmit data.
LAA1 is waited, and LAA2 and LAA3 continue countdown, and as arrival time T, LAA1 transmits data, and LAA2 countdown is straight
It connects zero and transmits data, start multipling channel.LAA3 does not participate in channel multiplexing, continues to test channel.As LAA1 and LAA2
LAA3 detects channel busy when multipling channel, therefore freezes countdown.
WiFi detects channel busy, does not transmit data.
Stage 2: at the end of LAA1 and LAA2 multipling channel, LAA3 detects channel idle, defrosting countdown.LAA1 and
After LAA2 transmits end of data, into the blank frame stage.In this period, WiFi detects channel idle and transmits data.When
LAA3 detects channel busy when WiFi transmits data, and freezes countdown.
Due to LAA1 and LAA2 multipling channel, the process of data transmission influences each other.The confirmation message that LAA1 is received
Quantity and the ratio for sending the sub-frame number in frame are the confirmation message number and send the subframe in frame that 0.8, LAA2 is received
The ratio of quantity is 0.5, then in next sending cycle of LAA1 and LAA2, the contention window of LAA1 keeps 32 constant, LAA2
Contention window be adjusted to 64 by original 32.
Stage 3:WiFi transmits end of data.LAA3 detects channel idle, defrosting countdown, at this time when keeping out of the way of LAA3
Between be 60 μ s.At the same time, LAA1 and LAA2 detects channel idle in new sending cycle, is based respectively on respective competition
Window 32 and 64 determines that back off time is respectively 120 μ s and 440 μ s.
LAA3 rate end first countdown, and the request for obtaining current back off time is issued to LAA1 and LAA2 by X2 interface
Signaling；Two back off times that the LAA1 and LAA2 that LAA3 is obtained are returned are respectively that 60 μ s and 380 μ s are looked for according to preset rules
The median of the back off time of LAA1, LAA2 out has two medians herein, its average value can be taken as final middle position
Number, i.e. (60+380)/2=220 μ s.LAA1 by back off time less than 220 μ s of median is determined as currently participating in channel multiplexing
The base station LAA, and send channel multiplexing demand signalling and transmission time started T ' to LAA1, T ' takes current channel multiplexing of participating in
The average value of the back off time of all LAA starts after i.e. (0+60)/2=30 μ s to transmit data.
LAA3 is waited, and LAA1 and LAA2 continue countdown, and when reaching T ', LAA3 transmits data, and LAA1 countdown is direct
It is zeroed and transmits data, start multipling channel.LAA2 does not participate in channel multiplexing, continues to test channel.When LAA3 and LAA1 is multiple
Channel busy is detected with LAA2 when channel, therefore freezes countdown.
Due to LAA3 and LAA1 multipling channel, the process of data transmission influences each other.The confirmation message that LAA1 is received
Quantity and the ratio for sending the sub-frame number in frame are the confirmation message number and send the subframe in frame that 0.9, LAA3 is received
The ratio of quantity is 1.According to these numerical value, the contention window of LAA3 and LAA1 halves in next sending cycle, i.e. LAA3 and
The contention window of LAA1 is adjusted to 16 by original 32.Data transmission procedure later is identical as foregoing description, herein no longer
It repeats.
It is understood that in figure 6b, for LAA1 and LAA2, stage 1 and stage 2 constitute a transmission week
Phase, wherein the stage 1 corresponds to the blank frame of LAA1 and LAA2 corresponding to the detection frame of LAA1 and LAA2 and transmission frame, stage 2.
For LAA3, detection frame and send frame that stage 1, stage 2 and stage 3 correspond in a sending cycle.
By above content as it can be seen that at the end of a base station LAA detects channel idle and countdown, to other LAA
Base station issues channel multiplexing request, and the base station LAA and the transmission for participating in channel multiplexing are then determined according to the back off time of other LAA
Time started.The base station LAA carries out data transmission with other base stations LAA in the determining transmission time started simultaneously, realizes same
Channel multiplexing of the multiple base stations LAA of one operator in unauthorized frequency range.It is meanwhile in the present embodiment, back off time is lesser
The base station LAA is determined as participating in the LAA of channel multiplexing, will participate in the average value of the back off time of the base station LAA of channel multiplexing as
The time started is transmitted, the waiting time is reduced, improves the efficiency of data transmission.
Referring to Fig. 7, which is that a kind of structure of the channel multiplexing device of unauthorized frequency range provided in an embodiment of the present invention is shown
It is intended to, corresponding with embodiment of the method shown in Fig. 1, described device includes:
Channel detection module 701, for when there are data to be transmitted, to channel energy in the detection frame of sending cycle
It is detected.
Wherein, sending cycle includes a detection frame, a transmission frame and a blank frame.
Specifically, the duration for the blank frame that WiFi website carries out data transmission in sending cycle is not less than transmission frame duration
5%, frame duration is sent between 1ms~10ms.
Countdown module 702 for when detecting channel idle, determining back off time, and is based on the back off time
Start data and transmits countdown.
Back off time sending module 703, for obtaining the back off time if receiving before the countdown terminates
Demand signalling, then send the back off time.
First transmission module 704, for when detect other base stations LAA send participation channel multiplexing demand signalling and
When the first transmission time started, carried out data transmission in the first transmission time started using frame is sent.
Back off time asks for module 705, if obtaining the demand signalling of the back off time for not receiving or not examining
The demand signalling for measuring the participation channel multiplexing of other base stations LAA transmission, the then at the end of countdown, to other LAA bases
It stands and sends the demand signalling for the back off time for obtaining other base stations LAA.
Second transmission module 706, the back off time for being returned according to other base stations LAA, according to preset rules, determination is worked as
The preceding base station LAA for participating in channel multiplexing and the second transmission time started, and letter is sent to each base station LAA for participating in channel multiplexing
Road is multiplexed demand signalling and the second transmission time started；Data biography is carried out using frame is sent in the second transmission time started
It is defeated.
It in another embodiment of the present invention, further include that module is freezed in countdown in Installation practice shown in Fig. 7
(not shown).
Module is freezed in the countdown, if freezed described for detecting channel busy before countdown terminates
Countdown, when detecting channel idle again, the countdown of thawing.
It in another embodiment of the present invention, further include multiplexing ending module (figure in Installation practice shown in Fig. 7
In be not shown).
The multiplexing ending module, for after countdown terminates, the first transmission time started or the second transmission to start
Before time, if detecting channel busy, terminate the letter in the first transmission time started or the second transmission time started
The step of road multiplex process, repetition detects channel energy in the detection frame of sending cycle.
It in another embodiment of the present invention, further include contention window determining module in Installation practice shown in Fig. 7
(not shown).
The contention window determining module obtains after data transmission for the duration according to contention window in a upper sending cycle
Confirmation message number andIt determines competing in the currently transmitted period
The duration of window is striven, wherein CWiFor the duration of contention window in a upper sending cycle, CWi+1For contention window in the currently transmitted period
Duration, α are to send in the confirmation message number and the sending cycle obtained after intraframe data transmission to send out in a upper sending cycle
Send the ratio of the sub-frame number in frame.
Referring to Fig. 8, which is the structure of the channel multiplexing device of another unauthorized frequency range provided in an embodiment of the present invention
Schematic diagram, in the device, channel detection module 801, countdown module 802, back off time sending module 803, first transmit mould
Block 804, back off time ask for module 805 respectively with the channel detection module 701 in Fig. 7, countdown module 702, back off time
Sending module 703, the first transmission module 704, back off time ask for that module 705 is identical, and details are not described herein.Second transmission module
806 can specifically include:
Identify that submodule 8061, the back off time for returning according to other base stations LAA identify other described base stations LAA
The median of back off time；
It determines submodule 8062, for back off time to be less than to other base stations LAA of the median, is determined as currently joining
Add the base station LAA of channel multiplexing.
Since the embodiment of the method that above-mentioned apparatus embodiment is the channel occupancy based on unauthorized frequency range obtains, with the party
Method technical effect having the same, therefore details are not described herein for the technical effect of Installation practice.
For device embodiment, since it is substantially similar to the method embodiment, related so describing fairly simple
Place illustrates referring to the part of embodiment of the method.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or any other variant be intended to it is non-
It is exclusive to include, so that the process, method, article or equipment for including a series of elements not only includes those elements,
It but also including other elements that are not explicitly listed, or further include solid by this process, method, article or equipment
Some elements.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including
There is also other identical elements in the process, method, article or equipment of the element.
It will appreciated by the skilled person that all or part of the steps in above embodiment is can to pass through journey
What sequence instructed relevant hardware to complete, the program can store in computer-readable storage medium.It is designated herein
Storage medium refers to ROM/RAM, magnetic disk, CD etc..
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the scope of the present invention.It is all
Any modification, equivalent substitution, improvement and etc. done within the spirit and principles in the present invention, are all contained in protection scope of the present invention
It is interior.
Claims (7)
1. a kind of channel multiplexing method of unauthorized frequency range, which is characterized in that be applied to authorization and assist the access base station LAA, comprising:
When there are data to be transmitted, channel energy is detected in the detection frame of sending cycle；Wherein, sending cycle packet
Include a detection frame, a transmission frame and a blank frame；
When detecting channel idle, back off time is determined, and data transmission countdown is started based on the back off time；
Before the countdown terminates, if receiving the demand signalling for obtaining the back off time, when keeping out of the way described in transmission
Between；
When detecting the demand signalling for participating in channel multiplexing and the first transmission time started that other base stations LAA are sent, in institute
The first transmission time started use transmission frame is stated to carry out data transmission；
If not receiving the demand signalling for obtaining the back off time or not detecting the participation channel that other base stations LAA are sent
The demand signalling of multiplexing sends to other base stations LAA then at the end of the countdown and obtains when keeping out of the way of other base stations LAA
Between demand signalling；
The current base station LAA for participating in channel multiplexing is determined according to preset rules according to the back off time that other base stations LAA return
And second transmission the time started, and to participate in channel multiplexing each base station LAA send channel multiplexing demand signalling and second pass
The defeated time started；Carried out data transmission in the second transmission time started using frame is sent；
If detecting channel busy before countdown terminates, freeze the countdown, when detecting channel idle again
When, the countdown of thawing；
After countdown terminates, before the first transmission time started or the second transmission time started, if detecting channel busy,
Then terminate the channel multiplexing process in the first transmission time started or the second transmission time started, repeats in sending cycle
The step of channel energy is detected in detection frame.
2. the method according to claim 1, wherein the method also includes:
According to the duration of contention window in a upper sending cycle, after data transmission the confirmation message number that obtains andDetermine the duration of contention window in the currently transmitted period, wherein CWiFor
The duration of contention window, CW in a upper sending cyclei+1For the duration of contention window in the currently transmitted period, α was upper transmission week
It is interim to send the ratio that the sub-frame number in frame is sent in the confirmation message number and the sending cycle obtained after intraframe data transmission
Value.
3. the method according to claim 1, wherein the back off time returned according to other base stations LAA, is pressed
According to preset rules, the current base station LAA for participating in channel multiplexing is determined, comprising:
According to the back off time that other base stations LAA return, the median of other base station LAA back off times is identified；
Back off time is less than to other base stations LAA of the median, is determined as currently participating in the base station LAA of channel multiplexing.
4. the method according to claim 1, wherein the method also includes:
The duration for the blank frame that WiFi website carries out data transmission in sending cycle sends frame not less than sending the 5% of frame duration
Duration is between 1ms~10ms.
5. a kind of channel multiplexing device of unauthorized frequency range, which is characterized in that be applied to authorization and assist the access base station LAA, comprising:
Channel detection module, for being examined in the detection frame of sending cycle to channel energy when there are data to be transmitted
It surveys；Wherein, sending cycle includes a detection frame, a transmission frame and a blank frame；
Countdown module starts data for when detecting channel idle, determining back off time, and based on the back off time
Transmit countdown；
Back off time sending module, for before the countdown terminates, if receiving the request for obtaining the back off time
Signaling then sends the back off time；
First transmission module, for when the demand signalling for participating in channel multiplexing and the first biography for detecting that other base stations LAA are sent
When the defeated time started, carried out data transmission in the first transmission time started using frame is sent；
Back off time asks for module, if obtaining the demand signalling of the back off time for not receiving or not detecting other
The demand signalling for the participation channel multiplexing that the base station LAA is sent sends to other base stations LAA and obtains then at the end of the countdown
Take the demand signalling of the back off time of other base stations LAA；
Second transmission module, the back off time for being returned according to other base stations LAA determine current participate according to preset rules
The base station LAA of channel multiplexing and the second transmission time started, and channel multiplexing is sent to each base station LAA for participating in channel multiplexing
Demand signalling and the second transmission time started；Carried out data transmission in the second transmission time started using frame is sent；
Module is freezed in countdown, if freezing the countdown for detecting channel busy before countdown terminates, when
When detecting channel idle again, the countdown of thawing；
It is multiplexed ending module, for after countdown terminates, before the first transmission time started or the second transmission time started,
If detecting channel busy, terminate the channel multiplexing mistake in the first transmission time started or the second transmission time started
Journey, repetition detect channel energy in the detection frame of sending cycle.
6. device according to claim 5, which is characterized in that described device further includes contention window determining module；
The contention window determining module obtains after data transmission for the duration according to contention window in a upper sending cycle
Confirmation message quantity andDetermine contention window in the currently transmitted period
Duration, wherein CWiFor the duration of contention window in a upper sending cycle, CWi+1For in the currently transmitted period contention window when
Long, α is to send in the confirmation message number and the sending cycle obtained after intraframe data transmission to send in a upper sending cycle
The ratio of sub-frame number in frame.
7. device according to claim 5, which is characterized in that second transmission module includes；
Identify that submodule, the back off time for returning according to other base stations LAA identify other described base station LAA back off times
Median；
It determines submodule, for back off time to be less than to other base stations LAA of the median, is determined as currently participating in channel and answers
The base station LAA.
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| TWI611681B (en) * | 2015-08-26 | 2018-01-11 | 財團法人資訊工業策進會 | Full-duplex radio receiver network device and full-duplex radio data transmission method thereof |
| CN107645729A (en) * | 2016-07-20 | 2018-01-30 | 中兴通讯股份有限公司 | Authorize collocation method, the apparatus and system of frequency spectrum auxiliary access LAA frequencies |
| KR102278751B1 (en) * | 2016-07-23 | 2021-07-19 | 주식회사 윌러스표준기술연구소 | Channel access method, apparatus and system in unlicensed band |
| WO2019136681A1 (en) * | 2018-01-12 | 2019-07-18 | 南通朗恒通信技术有限公司 | Method and apparatus used in user equipment and base station for wireless communication |
| US20200053798A1 (en) * | 2018-08-10 | 2020-02-13 | Mediatek Inc. | Methods for mitigating impact of listen-before-talk in unlicensed spectrum |
| CN112770324B (en) * | 2019-11-06 | 2023-02-07 | 维沃移动通信有限公司 | Method for sharing channel occupation time, terminal equipment and network equipment |
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