CN103312466A - Transmission method and receiving station for null feedback frame - Google Patents
Transmission method and receiving station for null feedback frame Download PDFInfo
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- CN103312466A CN103312466A CN2012100709911A CN201210070991A CN103312466A CN 103312466 A CN103312466 A CN 103312466A CN 2012100709911 A CN2012100709911 A CN 2012100709911A CN 201210070991 A CN201210070991 A CN 201210070991A CN 103312466 A CN103312466 A CN 103312466A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0026—Transmission of channel quality indication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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Abstract
The invention discloses a transmission method and a receiving station for a null feedback frame. The transmission method comprises the step that the receiving station transmits a wireless frame carrying channel measurement information to a transmitting station after receiving a channel measurement information request frame from the transmitting station. When the wireless frame is the null feedback frame, the null feedback frame only comprises a short training sequence domain, a long training sequence domain and a signaling domain. By applying the transmission method and the receiving station disclosed by the invention, the problems that the load transmission is greater in overhead and is higher in power consumption due to the fact that the transmission of the null feedback frame is limited by a general frame format in the relevant art are solved and further the overhead of the load transmission is effectively reduced, the power consumption is reduced and the performances of the system are improved while the null feedback frame is enabled to finish corresponding functions.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of transmission method and receiving station of empty feedback frame.
Background technology
Current, in field of wireless, WLAN (wireless local area network) (Wireless Local Area Network abbreviates WLAN as) fast development, it is growing that the right WLAN in the whole world covers demand.Institute of Electrical and Electric Engineers industrial specification IEEE802.11 working group has successively defined 802.11a, 802.11b, and a series of WLAN technical standards such as 802.11g are mainly formulated physical layer (PHY) and media interviews controls (MAC) layer standard.Other task groups have appearred subsequently successively, be devoted to develop the standard that relates to existing 802.11 technological improvements, for example, 802.11ah task groups is primarily aimed at the resource of exempting from licensed band below the 1GHz frequency range and utilizes, be used for supporting intelligent grid, sensor network, new network applications such as Cellular Networks load balancing.
802.11ah task groups is when formulating its technical specification, wish that the technical specification of 802.11ah continues to use the technical specification of existing 802.11 series as far as possible, in order to satisfy the peculiar attribute of 802.11ah itself, also can make suitable modification or formulate new technical specification existing technical specification simultaneously.The 802.11ah task groups determines that the bandwidth of operation of technology can be 1/2/4/8/16MHz at present; adopt OFDM (Orthogonal Frequency Division Multiplexing; abbreviate OFDM as) modulation technique; each OFDM symbol (comprising long protection at interval) duration is 40 μ s, and the required time of holding of each OFDM symbol has enlarged 10 times in these existing relatively 802.11 series standards.In other words, send identical information, the equipment power dissipation that adopts the 802.11ah technical specification will be to meet 10 times of existing 802.11 technical specification equipment, but the equipment that meets the 802.11ah technical specification has high requirements aspect energy-conservation,
Thereby this just need finish corresponding function with the more brief mode of intelligence transmission.Be called short response frame (Short Ack) such as proposing a kind of new radio frames among the 11ah, with empty Frame (Null Data Packet, abbreviate NDP as) frame structure identical, indicating the frame type of radio frames by the signaling territory is sky Frame or short response frame, the expense of so just having saved common Ack.
802.11 the basic network architecture be one and insert website (access point, abbreviate AP as) and a plurality of non-access sites (the non-AP Station related with AP, abbreviate STA as) formed a Basic Service Set (basic service set, abbreviate BSS as), each Basic Service Set has a BSSID (basic service set identifier, abbreviate BSSID as), and be that each non-access site that this basic service is concentrated distributes association identification (Association Identifier abbreviates AID as).Carrying out under the defeated situation of closed loop multi-antenna transmitting, if during the Beamforming transmission, send website Beamformer and need know channel information between itself and the receiving station Beamformee, so just need Beamformee to carry out channel measurement and channel measurement information (superelevation throughput compressional wave beam shaping frame VHT Compressed Beamforming frame) is fed back to Beamformer.Be example with superelevation 802.11 technology of (Very High Throughput) of handling up, channel measurement information comprises superelevation throughput multiple-input and multiple-output control domain (VHT MIMO Control Field) and channel measurement information report territory and physics frame head, the mac frame header overhead, when channel measurement information during greater than the packet maximum transmission time, Beamformee will send empty feedback frame to Beamformer, empty feedback frame does not comprise the channel measurement report, only comprises superelevation throughput multiple-input and multiple-output control domain (VHT MIMO Control Field) and physics frame head, the mac frame header overhead.Shown in the superelevation throughput multiple-input and multiple-output control domain accompanying drawing 1, when the feedback frame was sky feedback frame, the information field of only withing a hook at the end (Remaining Segments field) put one entirely at present, and other territories all keep and all zero setting.What as seen empty feedback frame was mainly finished is a function indication, but is subject to the interchangeable frame form, and it has carried many unnecessary information.Therefore, in transmission course, overhead is bigger, has caused resource waste.
Summary of the invention
The invention provides a kind of transmission method of empty feedback frame and the receiving station of empty feedback frame, be subject to general frame format with the transmission that solves correlation technique hollow feedback frame at least, caused the big and power consumption problem of higher of traffic load expense.
According to an aspect of the present invention, a kind of transmission method of empty feedback frame is provided, comprise: after receiving station receives the channel measurement information claim frame of reception from the transmission website, send the radio frames of carrying channel measurement information to described transmission website, when described radio frames was sky feedback frame, described empty feedback frame only comprised: short training sequence territory, long training sequence territory and signaling territory.
Preferably, carry one of following information in the described signaling territory at least: send the identifying information of website, the identifying information of receiving station.
Preferably, the identifying information of described transmission website is the association identification AID that sends website or the MAC Address that sends website, and the identifying information of described receiving station is the MAC Address of association identification AID or the receiving station of receiving station.
Preferably, described signaling territory also comprises cyclic redundancy check information, wherein, described cyclic redundancy check information is the check information to the signaling domain information, or to the associating check information of signaling domain information and additional information, wherein, described additional information is BSSID information or part BSSID information, and wherein said part BSSID information is the BSSID information after compressing.
Preferably, described signaling territory also comprises: receiver address territory and transmission address field, wherein, when described empty feedback frame sends to site STA by access point AP, described receiver address territory is set to the associated designation symbol AID of site STA, and described transmission address field is set to BSSID or part BSSID; When described empty feedback frame sent to access point AP by site STA, described receiver address territory was set to BSSID or part BSSID, and described transmission address field is set to the associated designation symbol AID of site STA.
Preferably, described long training sequence territory is made up of a plurality of OFDM symbols, indicates by two adjacent in the described long training sequence territory intersymbol phase deviations of OFDM whether described radio frames is empty feedback frame.
Preferably, described signaling territory also comprises the reservation information field, indicates the frame type of described radio frames to indicate whether the frame type of described radio frames is empty feedback frame by multiplexing described reservation information field.
Preferably, described reservation information field is the untapped value of MCS subdomain.
Preferably, described empty feedback frame is short response frame, and perhaps described empty feedback frame is the frame that frame structure is identical and frame type is different with described short response frame.
Preferably, indicate by the intersymbol phase deviation of different OFDM of described short response frame whether described radio frames is empty feedback frame, perhaps indicate frame type by the reservation domain information territory of described short response frame.
Preferably, also carry channel in the described signaling territory and insert subscription time.
According to a further aspect in the invention, provide a kind of receiving station, having comprised: receiver module is used for receiving reception from the channel measurement information claim frame that sends website; Sending module is used for sending the radio frames of carrying channel measurement information to described transmission website, and when described radio frames was sky feedback frame, described empty feedback frame only comprised: short training sequence territory, long training sequence territory and signaling territory.
Preferably, carry one of following information in the described signaling territory at least: send the identifying information of website, the identifying information of receiving station.
Preferably, the identifying information of described transmission website is the association identification AID that sends website or the MAC Address that sends website, and the identifying information of described receiving station is the MAC Address of association identification AID or the receiving station of receiving station.
Preferably, described signaling territory also comprises cyclic redundancy check information, wherein, described cyclic redundancy check information is the check information to the signaling domain information, or to the associating check information of signaling domain information and additional information, wherein, described additional information is BSSID information or part BSSID information, and wherein said part BSSID information is the BSSID information after compressing.
Preferably, described signaling territory also comprises: receiver address territory and transmission address field, wherein,
When described empty feedback frame sent to site STA by access point AP, described receiver address territory was set to the associated designation symbol AID of site STA, and described transmission address field is set to BSSID or part BSSID;
When described empty feedback frame sent to access point AP by site STA, described receiver address territory was set to BSSID or part BSSID, and described transmission address field is set to the associated designation symbol AID of site STA.
Preferably, described long training sequence territory is made up of a plurality of OFDM symbols, indicates by two adjacent in the described long training sequence territory intersymbol phase deviations of OFDM whether described radio frames is empty feedback frame.
Preferably, described signaling territory also comprises the reservation information field, indicates by multiplexing described reservation information field whether the frame type of described radio frames is empty feedback frame.
Preferably, described empty feedback frame is short response frame, and perhaps described empty feedback frame is the frame that frame structure is identical and frame type is different with described short response frame.
By the present invention, adopt transmission only to comprise the method for the sky feedback frame in short training sequence territory, long training sequence territory and signaling territory, the transmission that has solved correlation technique hollow feedback frame is subject to general frame format, caused the big and power consumption problem of higher of traffic load expense, and then when guaranteeing that empty feedback frame is finished corresponding function, effectively reduce the traffic load expense, reduce power consumption, promoted the performance of system.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not constitute improper restriction of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation according to the sky feedback frame of correlation technique;
Fig. 2 is the flow chart according to the transmission method of the sky feedback frame of the embodiment of the invention;
Fig. 3 is the structural representation according to the sky feedback frame of the embodiment of the invention;
Fig. 4 is the flow chart according to the transmission method of the sky feedback frame of the embodiment of the invention one;
Fig. 5 is the flow chart according to the transmission method of the sky feedback frame of the embodiment of the invention two;
Fig. 6 is the flow chart according to the transmission method of the sky feedback frame of the embodiment of the invention three;
Fig. 7 is the flow chart according to the transmission method of the sky feedback frame of the embodiment of the invention four;
Fig. 8 is the flow chart according to the transmission method of the sky feedback frame of the embodiment of the invention five; And
Fig. 9 is the structured flowchart according to the receiving station of the embodiment of the invention.
Embodiment
Hereinafter will describe the present invention with reference to the accompanying drawings and in conjunction with the embodiments in detail.Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.
Transmission based on correlation technique hollow feedback frame is subject to general frame format, caused the big and power consumption problem of higher of traffic load expense, the embodiment of the invention provides a kind of transmission method of empty feedback frame, and the flow process of this method comprises that step S202 is to step S204 as shown in Figure 2:
Step S202, receiving station receive reception from the channel measurement information claim frame that sends website;
Step S204, receiving station sends the radio frames of carrying channel measurement information to sending website, and when radio frames was sky feedback frame, empty feedback frame only comprised: short training sequence territory, long training sequence territory and signaling territory.
Pass through the embodiment of the invention, adopt transmission only to comprise the method for the sky feedback frame (Fig. 3 shows the structural representation of above-mentioned empty feedback frame) in short training sequence territory, long training sequence territory and signaling territory, the transmission that has solved correlation technique hollow feedback frame is subject to general frame format, caused the big and power consumption problem of higher of traffic load expense, and then when guaranteeing that empty feedback frame is finished corresponding function, effectively reduce the traffic load expense, reduce power consumption, promoted the performance of system.
In above-mentioned radio frame transmission process, when radio frames is sky feedback frame, carry one of following information in its signaling territory at least: the identifying information, the identifying information of receiving station, the channel that send website insert subscription time.
Wherein, the identifying information that sends website can or be the MAC Address of transmission website for the association identification AID of dispatching station point, and the identifying information of receiving station also can be for being the MAC Address of association identification AID or the receiving station of receiving station.
In the concrete process that arranges, the signaling territory can also comprise cyclic redundancy check information, this information is the check information to the signaling domain information, certainly, it also can be the associating check information to signaling domain information and additional information, wherein, additional information is BSSID information or part BSSID information, and wherein part BSSID information is the BSSID information after compressing.The verification of said additional information can judge also whether radio frames is empty feedback frame.
The signaling territory not only can comprise cyclic redundancy check information, can also comprise the receiver address territory and send address field.Under recipient's situation different with transmit leg, receiver address is also inequality with the setting that sends the address.It arranges and can be divided into following two kinds of situations:
Situation one: when sky feedback frame sent to site STA by access point AP, the receiver address territory was set to the associated designation symbol AID of site STA, sends address field and is set to BSSID or part BSSID.
Situation two: when sky feedback frame sent to access point AP by site STA, the receiver address territory was set to BSSID or part BSSID, sent the associated designation symbol AID that address field is set to site STA.
In the long training sequence territory of sky feedback frame, also comprise a plurality of OFDM symbols, the recipient can judge whether radio frames is empty feedback frame by two adjacent in the long training sequence territory intersymbol phase deviations of OFDM, namely can indicate whether radio frames is empty feedback frame by two adjacent in the long training sequence territory intersymbol phase deviations of OFDM.
The signaling territory is comprising above-mentioned cyclic redundancy check information, receiver address territory and is sending outside the address field, also comprise the reservation information field, wherein, this reservation information field is the reservation territory in the signaling territory in the prior art frame structure, and present embodiment is the frame type of indicating radio frames by multiplexing reservation information field.The transmit leg that sends radio frames can indicate above-mentioned radio frames to be empty feedback frame by the definition different situations in keeping information field, and the recipient who receives radio frames can determine whether this radio frames is empty feedback frame according to different indication situations.
In implementation process, keep information field and can be the MCS subdomain in radio frames signaling territory in the prior art untapped value still.
In the specific implementation process, the radio frames that can also send is set to short response frame, and when then namely empty feedback frame sent as short response frame, the recipient who receives radio frames can determine directly that this radio frames is empty feedback frame.Certainly, empty feedback frame also can be identical with the frame structure of short response frame, but the different frame of frame type, this kind frame also can reach direct and determine that the radio frames that sends is the empty effect of feeding back frame.The transmit leg that sends short response frame can indicate whether radio frames is empty feedback frame by the intersymbol phase deviation of different OFDM of short response frame, perhaps indicates frame type by the reservation domain information territory of short response frame.
In the process that above-mentioned steps is implemented, empty feedback frame can only comprise short training sequence territory, long training sequence territory and signaling territory, the sky that only comprises above-mentioned three territories feeds back the purpose that frame can better be realized saving expense, reduce power consumption, certainly, also can carry out conversion of the same type according to the form in above-mentioned three kinds of territories.
Embodiment one
Present embodiment is set in and carries out the Beamforming transmission in the 802.11ah system.Flow process comprises that step S402 is to step S414 as shown in Figure 4:
Step S402, when needs carried out the Beamforming transmission, transmit leg (Beamformer) was asked Beamformee feedback channel metrical information to recipient (Beamformee) transmitting channel metrical information claim frame.
Step S404, after the Beamformee request of receiving, send empty feedback frame to Beamformer, then this frame only comprises three territories: short training sequence territory, long training sequence territory and signaling territory, wherein, two adjacent in long training sequence territory OFDM symbols have a definite phase deviation, are used to indicate this feedback of channel information frame and are empty feedback frame.At this moment, also carry the associated designation symbol AID of Beamformer, channel turn-on time and the cyclic redundancy check (CRC) sequence of reservation in this frame signaling territory.
After step S406, Beamformer receive above-mentioned frame, detect the cyclic redundancy check (CRC) sequence in this frame signaling territory.If mistake, execution in step S414 then, if verification is correct, execution in step S408 then.
Step S408, by resolving the difference of adjacent OFDM symbol in this frame length training sequence territory, conclude that what receive is empty feedback frame, and receiving the signaling territory is that (the signaling territory of the sky feedback frame that namely receives is different with prior art signaling territory in the signaling territory that is not used in prior art signaling territory, its effect is not the effect in signaling territory in the prior art, and structure is also inequality).If, execution in step S410 then, otherwise execution in step S414.
Step S410 further resolves the address field in the signaling territory that receives, judge in the signaling territory address field whether with the AID coupling of Beamformer self, if mate, execution in step S412 then,, otherwise execution in step S414.
Step S412 determines that the radio frames of carrying channel measurement information of Beamformee feedback is empty feedback frame.
Step S414 abandons this frame.
Embodiment two
Present embodiment is set in and carries out the Beamforming transmission in the 802.11ah system.Flow process comprises that step S502 is to step S514 as shown in Figure 5:
Step S502, when carrying out the Beamforming transmission, transmit leg (Beamformer) is to recipient (Beamformee) transmitting channel metrical information claim frame request Beamformee feedback channel metrical information.
Step S504 sends empty feedback frame to Beamformer after the Beamformee request of receiving, then this frame only comprises three territories: short training sequence territory, long training sequence territory and signaling territory.Central Plains, signaling territory is as the multiplexing frame type indication territory of doing, the territory of MCS indication, and the value that this territory is set represents that this feedback of channel information frame is empty feedback frame.At this moment, carry the associated designation symbol AID of Beamformer, channel turn-on time and the cyclic redundancy check (CRC) sequence of reservation in this frame signaling territory.
Step S506, Beamformer detect the cyclic redundancy check (CRC) sequence after receiving above-mentioned empty feedback frame, if mistake, then execution in step S514 if verification is correct, then represents to receive that radio frames is correct frame, execution in step S508.
Step S508 further resolves the MCS subdomain, in the process that the MCS subdomain is resolved, judges that its value is whether within normal range (NR).If its value is not within normal span, conclude that then what receive is empty feedback frame, and receiving the signaling territory is that (the signaling territory of the sky feedback frame that namely receives is different with prior art signaling territory in the signaling territory that is not used in prior art signaling territory, its effect is not the effect in signaling territory in the prior art), execution in step S510, otherwise execution in step S514.
Step S510, the address field of further resolving in the signaling territory that receives judges whether and self AID coupling.If coupling, execution in step S512 then, otherwise execution in step S514.
Step S512 determines that the radio frames of carrying channel measurement information of Beamformee feedback is empty feedback frame.
Step S514 abandons this frame.
Embodiment three
Present embodiment is set in and carries out the Beamforming transmission in the 802.11ah system.Flow process comprises that step S602 is to step S614 as shown in Figure 6:
Step S602, when carrying out the Beamforming transmission, transmit leg is AP, the recipient is STA-1.AP asks STA-1 feedback channel metrical information to STA-1 transmitting channel metrical information claim frame.
Step S604, after the STA-1 request of receiving, send empty feedback frame to AP, then this frame only comprises three territories: short training sequence territory, long training sequence territory and signaling territory, wherein, two adjacent in long training sequence territory OFDM symbols have a definite phase deviation, represent that this feedback of channel information frame is empty feedback frame.At this moment, carry the associated designation symbol AID of AP, channel turn-on time and the cyclic redundancy check (CRC) sequence of reservation in this frame signaling territory.
Step S606 after AP receives above-mentioned empty feedback frame, detects the cyclic redundancy check (CRC) sequence, judges whether mistake.If mistake, execution in step S614 then, if verification is correct, execution in step S608 then.
Step S608, by resolving the difference of adjacent OFDM symbol in the long training sequence territory, conclude that what receive is empty feedback frame, and receiving the signaling territory is the signaling territory (the signaling territory of the sky feedback frame that namely receives is different with prior art signaling territory, and its effect is not the effect in signaling territory in the prior art) that is not used in prior art signaling territory.If, execution in step S610 then, otherwise, execution in step S614.
Step S610 further resolves the address field in the signaling territory that receives, judge in the signaling territory that receives address field whether with self AID coupling.If coupling, execution in step S612 then, otherwise execution in step S614.
Step S612 determines that the radio frames of carrying channel measurement information of STA-1 feedback is empty feedback frame.
Step S614 abandons this frame.
In implementation process, after all the other websites receive this frame, detect the cyclic redundancy check (CRC) sequence, if mistake is then abandoned this frame, if verification is correct, then further resolve the MCS subdomain.
When other website is resolved the MCS subdomain, if its value is not within normal span, conclude that then receiving the signaling territory is the signaling territory that is not used in prior art signaling territory, value according to MCS territory and/or other territories, conclude that this frame is the frame with request channel measurement feedback function, but the address field in the signaling territory and own AID do not match, and then this receiving station utilizes the channel of preengaging in the signaling territory to make a decision the NAV of back renewal oneself turn-on time, abandons this frame.
Embodiment four
Present embodiment is set in and carries out the Beamforming transmission in the 802.11ah system.Flow process comprises that step S702 is to step S714 as shown in Figure 7:
Step S702, when needs carried out the Beamforming transmission, transmit leg AP asked STA-1 feedback channel metrical information to recipient STA-1 transmitting channel metrical information claim frame.
Step S704, after the STA-1 request of receiving, send empty feedback frame to AP, then this frame only comprises three territories: short training sequence territory, long training sequence territory and signaling territory, Central Plains, signaling territory is as the multiplexing frame type indication territory of doing, the territory of MCS indication, the value that this territory is set represents that this feedback of channel information frame is empty feedback frame, at this moment, carry the associated designation symbol AID of AP, channel turn-on time and the cyclic redundancy check (CRC) sequence of reservation in this frame signaling territory.
Step S706, AP detect the cyclic redundancy check (CRC) sequence after receiving above-mentioned empty feedback frame, if mistake, execution in step S714 then, if verification is correct, execution in step S708 then.
Step S708 further resolves the MCS subdomain, judges that its value is whether in normal span.If its value not within normal span, concludes then that what receive is empty feedback frame, and to receive the signaling territory be the signaling territory that is not used in prior art signaling territory, execution in step S710; Otherwise, execution in step S714.
Step S710, judge in the signaling territory receive address field whether with own AID coupling, if coupling, execution in step S712 then, otherwise execution in step S714.
Step S712 determines that the radio frames of carrying channel measurement information of STA-1 feedback is empty feedback frame.
Step S714 abandons this frame.
In the implementation process, after all the other websites receive this frame, detect the cyclic redundancy check (CRC) sequence, if mistake is then abandoned this frame, if verification is correct, then further resolve the MCS subdomain.
When other website is resolved the MCS subdomain, if its value is not within normal span, conclude that then receiving the signaling territory is that (the signaling territory of the sky feedback frame that namely receives is different with prior art signaling territory in the signaling territory that is not used in prior art signaling territory, its effect is not the effect in signaling territory in the prior art), value according to MCS territory and/or other territories, conclude that this frame is the frame with request channel measurement feedback function, but the address field in the signaling territory and own AID do not match, then abandon this frame.
In specific implementation process, suppose that Beamformee receives that the request back sends empty feedback frame to Beamformer, then can be that Beamformee directly sends a short response frame to Beamformer, or feed back frame with the identical radio frames of short response frame frame structure as sky.
Embodiment five
Present embodiment is set in and carries out the Beamforming transmission in the 802.11ah system.Flow process comprises that step S802 is to step S814 as shown in Figure 8:
Step S802, when needs carried out the Beamforming transmission, AP asked STA feedback channel metrical information to STA transmitting channel metrical information claim frame.
Step S804, after the STA request of receiving, send empty feedback frame to AP, then this frame only comprises three territories: short training sequence territory, long training sequence territory and signaling territory, wherein, two adjacent in long training sequence territory OFDM symbols have a definite phase deviation, represent that this feedback of channel information frame is empty feedback frame.At this moment, receiver address is set to the BSSID of AP in this frame signaling territory, and the associated designation that the transmission address is set to STA accords with channel turn-on time and the cyclic redundancy check (CRC) sequence that also comprises reservation in AID, the signaling territory.
Step S806 detects the cyclic redundancy check (CRC) sequence, if mistake, execution in step S814 then, if verification is correct, execution in step S808.
Step S808, after AP receives above-mentioned empty feedback frame, by resolving the difference of adjacent OFDM symbol in the long training sequence territory, conclude that what receive is empty feedback frame, and receiving the signaling territory is that (the signaling territory of the sky feedback frame that namely receives is different with prior art signaling territory in the signaling territory that is not used in prior art signaling territory, its effect is not the effect in signaling territory in the prior art), execution in step S810 then, otherwise execution in step S814.
Step S810 further resolves the receiver address territory in the signaling territory that receives, judge in the signaling territory that receives the receiver address territory whether with self BSSID coupling.If coupling, execution in step S812 then, otherwise execution in step S814.
Step S812 determines that the radio frames of carrying channel measurement information of STA feedback is empty feedback frame.
Step S814 abandons this frame.
The embodiment of the invention also provides a kind of receiving station of empty feedback frame, as shown in Figure 9, comprising: receiver module 10 is used for receiving reception from the channel measurement information claim frame that sends website; Sending module 20 with receiver module 10 couplings, is used for sending the radio frames of carrying channel measurement information to sending website, and when radio frames was sky feedback frame, empty feedback frame only comprised: short training sequence territory, long training sequence territory and signaling territory.
In the above-mentioned signaling territory, can also carry one of following information: send the identifying information of website, the identifying information of receiving station.Wherein, the identifying information that sends website is the association identification AID that sends website or the MAC Address that sends website, and the identifying information of receiving station is the MAC Address of association identification AID or the receiving station of receiving station.
In implementation process, the signaling territory can also comprise one or more in cyclic redundancy check information or the address field (receiver address territory and transmission address field).Above-mentioned cyclic redundancy check information is the check information to the signaling domain information, or to the associating check information of signaling domain information and additional information, wherein, additional information is BSSID information or part BSSID information, and wherein part BSSID information is the BSSID information after compressing.
In the receiving station process mutual with sending website, receiver address territory and send address field and can carry out different settings according to receiving station and transmission website different.When sky feedback frame sent to site STA by access point AP, the receiver address territory was set to the associated designation symbol AID of site STA, sends address field and is set to BSSID or part BSSID; When sky feedback frame sent to access point AP by site STA, the receiver address territory was set to BSSID or part BSSID, sent the associated designation symbol AID that address field is set to site STA.
In the sky feedback frame that receiving station receives, also comprise the long training sequence territory, it is made up of a plurality of OFDM symbols, indicates by two adjacent in the long training sequence territory intersymbol phase deviations of OFDM whether radio frames is empty feedback frame.That is to say, after receiving station receives radio frames, can judge whether the radio frames of receiving is empty feedback frame by two adjacent in the long training sequence territory intersymbol phase deviations of OFDM.
The signaling territory can also comprise the reservation information field.Receiving station judges by keeping information field whether the frame type of radio frames is empty feedback frame after receiving radio frames.
Preferably, empty feedback frame can be short response frame, and perhaps empty feedback frame is the frame that frame structure is identical and frame type is different with short response frame.After receiving station received radio frames, if this radio frames is that short response frame or structure are identical with it, then receiving station can judge directly that this frame is empty feedback frame.
As can be seen from the above description, the present invention has realized following technique effect:
By the embodiment of the invention, when guaranteeing to finish corresponding function, effectively reduce the traffic load expense, reduce power consumption; In addition, physical layer signaling adopts the most reliable Modulation and Coding Scheme usually, the function indication is positioned in the physical layer signaling transmits, and can improve the reliability of transmission.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and be carried out by calculation element, and in some cases, can carry out step shown or that describe with the order that is different from herein, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (19)
1. the transmission method of an empty feedback frame is characterized in that, comprising:
After receiving station receives the channel measurement information claim frame of reception from the transmission website, send the radio frames of carrying channel measurement information to described transmission website, when described radio frames was sky feedback frame, described empty feedback frame only comprised: short training sequence territory, long training sequence territory and signaling territory.
2. method according to claim 1 is characterized in that, carries one of following information in the described signaling territory at least: send the identifying information of website, the identifying information of receiving station.
3. method according to claim 2, it is characterized in that, the identifying information of described transmission website is the association identification AID that sends website or the MAC Address that sends website, and the identifying information of described receiving station is the MAC Address of association identification AID or the receiving station of receiving station.
4. method according to claim 3, it is characterized in that, described signaling territory also comprises cyclic redundancy check information, wherein, described cyclic redundancy check information is the check information to the signaling domain information, or to the associating check information of signaling domain information and additional information, wherein, described additional information is BSSID information or part BSSID information, and wherein said part BSSID information is the BSSID information after compressing.
5. method according to claim 4 is characterized in that, described signaling territory also comprises: receiver address territory and transmission address field, wherein,
When described empty feedback frame sent to site STA by access point AP, described receiver address territory was set to the associated designation symbol AID of site STA, and described transmission address field is set to BSSID or part BSSID;
When described empty feedback frame sent to access point AP by site STA, described receiver address territory was set to BSSID or part BSSID, and described transmission address field is set to the associated designation symbol AID of site STA.
6. method according to claim 1 is characterized in that, described long training sequence territory is made up of a plurality of OFDM symbols, indicates by two adjacent in the described long training sequence territory intersymbol phase deviations of OFDM whether described radio frames is empty feedback frame.
7. method according to claim 1 is characterized in that, described signaling territory also comprises the reservation information field, indicates by multiplexing described reservation information field whether the frame type of described radio frames is empty feedback frame.
8. method according to claim 7 is characterized in that, described reservation information field is the untapped value of MCS subdomain.
9. method according to claim 1 is characterized in that, described empty feedback frame is short response frame, and perhaps described empty feedback frame is the frame that frame structure is identical and frame type is different with described short response frame.
10. method according to claim 9 is characterized in that, indicates by the intersymbol phase deviation of different OFDM of described short response frame whether described radio frames is empty feedback frame, perhaps indicates frame type by the reservation domain information territory of described short response frame.
11. method according to claim 1 is characterized in that, also carries channel in the described signaling territory and inserts subscription time.
12. a receiving station is characterized in that, comprising:
Receiver module is used for receiving the channel measurement information claim frame from sending website;
Sending module is used for sending the radio frames of carrying channel measurement information to described transmission website, and when described radio frames was sky feedback frame, described empty feedback frame only comprised: short training sequence territory, long training sequence territory and signaling territory.
13. receiving station according to claim 12 is characterized in that, carries one of following information in the described signaling territory at least:
Send the identifying information of website, the identifying information of receiving station.
14. receiving station according to claim 13, it is characterized in that, the identifying information of described transmission website is the association identification AID that sends website or the MAC Address that sends website, and the identifying information of described receiving station is the MAC Address of association identification AID or the receiving station of receiving station.
15. receiving station according to claim 14, it is characterized in that, described signaling territory also comprises cyclic redundancy check information, wherein, described cyclic redundancy check information is the check information to the signaling domain information, or to the associating check information of signaling domain information and additional information, wherein, described additional information is BSSID information or part BSSID information, and wherein said part BSSID information is the BSSID information after compressing.
16. receiving station according to claim 15 is characterized in that, described signaling territory also comprises: receiver address territory and transmission address field, wherein,
When described empty feedback frame sent to site STA by access point AP, described receiver address territory was set to the associated designation symbol AID of site STA, and described transmission address field is set to BSSID or part BSSID;
When described empty feedback frame sent to access point AP by site STA, described receiver address territory was set to BSSID or part BSSID, and described transmission address field is set to the associated designation symbol AID of site STA.
17. receiving station according to claim 12, it is characterized in that, described long training sequence territory is made up of a plurality of OFDM symbols, indicates by two adjacent in the described long training sequence territory intersymbol phase deviations of OFDM whether described radio frames is empty feedback frame.
18. receiving station according to claim 12 is characterized in that, described signaling territory also comprises the reservation information field, indicates by multiplexing described reservation information field whether the frame type of described radio frames is empty feedback frame.
19. receiving station according to claim 12 is characterized in that, described empty feedback frame is short response frame, and perhaps described empty feedback frame is the frame that frame structure is identical and frame type is different with described short response frame.
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| CN2012100709911A CN103312466A (en) | 2012-03-16 | 2012-03-16 | Transmission method and receiving station for null feedback frame |
| PCT/CN2012/088019 WO2013135092A1 (en) | 2012-03-16 | 2012-12-31 | Null feedback frame transmission method and reception station |
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| CN2012100709911A CN103312466A (en) | 2012-03-16 | 2012-03-16 | Transmission method and receiving station for null feedback frame |
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| CN104639228A (en) * | 2013-11-11 | 2015-05-20 | 宇龙计算机通信科技(深圳)有限公司 | Wireless communication method and device |
| CN106376093A (en) * | 2015-07-24 | 2017-02-01 | 中兴通讯股份有限公司 | Transmission control method and device for avoiding data collision |
| WO2017133420A1 (en) * | 2016-02-01 | 2017-08-10 | 华为技术有限公司 | Channel measuring method and device |
| CN107113273A (en) * | 2015-01-08 | 2017-08-29 | 华为技术有限公司 | The method and access point of phase offset correction in WLAN |
| CN107666379A (en) * | 2016-07-28 | 2018-02-06 | 北京信威通信技术股份有限公司 | A kind of method and device for sending data |
| CN107994976A (en) * | 2016-10-26 | 2018-05-04 | 华为技术有限公司 | A kind of rapid answer answering method and device |
| CN108011688A (en) * | 2016-11-01 | 2018-05-08 | 华为技术有限公司 | A kind of method, access point and system for transmitting multi-site control frame |
| WO2018082029A1 (en) * | 2016-11-04 | 2018-05-11 | 华为技术有限公司 | Channel measurement method and apparatus, and terminal |
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| CN104639228B (en) * | 2013-11-11 | 2018-06-15 | 宇龙计算机通信科技(深圳)有限公司 | Wireless communications method and wireless telecom equipment |
| CN107113273A (en) * | 2015-01-08 | 2017-08-29 | 华为技术有限公司 | The method and access point of phase offset correction in WLAN |
| CN106376093B (en) * | 2015-07-24 | 2021-02-09 | 中兴通讯股份有限公司 | Transmission control method and device for avoiding data collision |
| CN106376093A (en) * | 2015-07-24 | 2017-02-01 | 中兴通讯股份有限公司 | Transmission control method and device for avoiding data collision |
| WO2017133420A1 (en) * | 2016-02-01 | 2017-08-10 | 华为技术有限公司 | Channel measuring method and device |
| US10863375B2 (en) | 2016-02-01 | 2020-12-08 | Huawei Technologies Co., Ltd. | Channel measurement method and apparatus |
| CN107666379A (en) * | 2016-07-28 | 2018-02-06 | 北京信威通信技术股份有限公司 | A kind of method and device for sending data |
| CN107994976A (en) * | 2016-10-26 | 2018-05-04 | 华为技术有限公司 | A kind of rapid answer answering method and device |
| CN107994976B (en) * | 2016-10-26 | 2021-06-22 | 华为技术有限公司 | Quick response reply method and device |
| US11025397B2 (en) | 2016-10-26 | 2021-06-01 | Huawei Technologies Co., Ltd. | Quick acknowledgement reply method and apparatus |
| CN108011688A (en) * | 2016-11-01 | 2018-05-08 | 华为技术有限公司 | A kind of method, access point and system for transmitting multi-site control frame |
| CN108011688B (en) * | 2016-11-01 | 2020-07-07 | 华为技术有限公司 | Method, access point and system for transmitting multi-station control frame |
| WO2018082029A1 (en) * | 2016-11-04 | 2018-05-11 | 华为技术有限公司 | Channel measurement method and apparatus, and terminal |
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