CN105813141A - Downlink multiuser transmission method and device - Google Patents
Downlink multiuser transmission method and device Download PDFInfo
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- CN105813141A CN105813141A CN201410852290.2A CN201410852290A CN105813141A CN 105813141 A CN105813141 A CN 105813141A CN 201410852290 A CN201410852290 A CN 201410852290A CN 105813141 A CN105813141 A CN 105813141A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
Abstract
The invention discloses a downlink multiuser transmission method and device, and the method comprises the steps that a station participating in downlink multiuser transmission adjusts uplink transmission time of sending a wireless frame to an AP (access point), and enables the wireless frame transmitted by the station to be able to reach the AP within the allowed time error; the station transmits the wireless frame to the AP according to the uplink transmission time, wherein the wireless frame transmitted by each station comprises a first part content and a second part content. The first part content comprises conventional station recognizable information, and the second part content comprises the information of the corresponding station.
Description
Technical field
The present invention relates to wireless communication field, particularly relate to a kind of descending multi-user transmission method and device.
Background technology
WLAN (WLAN, WirelessLocalAreaNetworks) in, one access point website (AP, and non-access point website (non-APStation associated plurality of with this AP AccessPoint), it is called for short non-APSTA) constitute a Basic Service Set (BSS, BasicServiceSet), as shown in Figure 1.WLAN is mainly based upon the time divided network of contention access mechanism, and under infrastructure network, synchronization can only be sent data by a sender, and namely when a website carries out data transmission, other websites keep mourning in silence.Wherein, AP sends data to non-APSTA, is referred to as descending transmission；Non-APSTA sends data to AP, is referred to as up transmission.
Along with increasing user uses WLAN to carry out data communication, wlan network load is also constantly increasing the weight of, and increasing along with number of users, and the efficiency of wlan network there will be the trend being decreased obviously.Therefore, Institute of Electrical and Electric Engineers (IEEE, InstituteofElectricalandElectronicsEngineers) normal structure has been set up relevant group of task and is devoted to solve wlan network efficiency, wherein, the transmission of parallel multi-user data is as a kind of alternative technique solving network efficiency.Parallel multi-user data transmission technology includes multi-user multiple-input and multiple-output (MU-MIMO, Multi-UserMultiple-InputMultiple-Output) technology (i.e. special domain multi-access), OFDM (OFDMA, OrthogonalFrequencyDivisionMultipleAccess) technology (i.e. frequency domain multiple) and Interleave Division Multiple Access (IDMA, Interleave-DivisionMultiple-Access) technology (i.e. code division territory multiple access).The transmission of parallel multi-user data can be divided into two kinds of situations, and one is that multiple minor node sends data to host node simultaneously, is called that uplink multi-users transmits, and another kind is that host node sends data to multiple minor nodes simultaneously, is called that descending multi-user transmits.
When adopting downlink OFDMA technical transmission, AP can send the data of different website over different frequency bands, but it is the major issue faced that AP distributes frequency band to obtain the best availability of frequency spectrum how reasonably to different users.Common solution is that signal is measured in AP Whole frequency band transmission one, participates in the channel that the website of OFDMA is current based on measuring signal measurement, then according to preset order is replied AP successively or waits that AP replys AP after dispatching, informs which frequency band of AP can be used.Under this type of scheme, the return information of multiple websites is by the time-division, efficiency is low, and first reply the website of AP, need after waiting last station replies, to receive the AP downlink data sent, within the time waited, owing to the website of AP Yu wait does not do alternately, i.e. not busy channel always, under the Channel Access Mechanism based on competition, channel can be seized by other websites, and until AP sends downlink data, the channel around website now waited has occurred and that change, causes measuring feedback information invalid.
Summary of the invention
For solving the technical problem of existing existence, embodiment of the present invention expectation provides a kind of descending multi-user transmission method and device.
The invention provides a kind of descending multi-user transmission method, described method includes:
Participate in the website of descending multi-user transmission, adjust the up transmission time sending radio frames to access point AP, make the radio frames that described website sends can arrive AP in the time error allowed；
Described website sends radio frames according to the described up transmission time to described AP；
Wherein, the described radio frames that each website sends includes Part I content and the second part, and described Part I content includes the discernible information of conventional station, and described the second part includes the respective information of each website.
It is preferred that described website sends radio frames on self all available sub-channel.
It is preferred that the described Part I content that includes of radio frames that sends of each website participating in descending multi-user transmission carries identical information.
It is preferred that described Part I content includes: traditional short training sequence territory L-STF, traditional long training sequence territory L-LTF and traditional signaling territory L-SIG.
It is preferred that load carrying frame Length Indication information in described L-SIG, described frame length instruction information is for indicating the length of Part I content.
It is preferred that described Part I content also includes traditional data field.
It is preferred that described data field includes: frame type instruction information, sender address information, recipient's address information and Duration sub domain information；
Wherein, the frame type of described frame type information instruction legacy equipment identification or new frame type instruction information, the address information that the instruction of described sender address information is preset, described recipient's address information indicates the address information of described AP, the described Duration subdomain instruction channel booking time.
It is preferred that the second part of described each user is only carried on the portion subcarriers of sub-channel used, and the portion subcarriers that each website uses is pre-assigned.
It is preferred that described the second part carrying information indicate described website can band resource.
It is preferred that the information of described the second part carrying indicates the channel quality information of described available band resource, described channel quality is that signal to noise ratio or Signal to Interference plus Noise Ratio or Modulation and Coding Scheme index.
It is preferred that the orthogonal numeral that described the second part is the website being pre-assigned to the transmission of described participation descending multi-user.
It is preferred that the described moment arriving the AP described radio frames referring to that each user sends arrival AP in the time error allowed meets the synchronization accuracy demand of system multi-user uplink.
Invention further provides a kind of descending multi-user transmitting device, it is characterised in that being applied to participate in the website that descending multi-user transmits, described device includes:
Time adjustment unit, for adjusting the website up transmission time to access point AP transmission radio frames of described participation descending multi-user transmission, makes the radio frames that described website sends can arrive AP in the time error allowed；
Transmitting element, for sending radio frames according to the described up transmission time to described AP；
Wherein, the described radio frames that each website sends includes Part I content and the second part, and described Part I content includes the discernible information of conventional station, and described the second part includes the respective information of each website.
It is preferred that described transmitting element is further used for, all available sub-channels of website send radio frames.
It is preferred that the described Part I content that includes of radio frames that sends of each website participating in descending multi-user transmission carries identical information.
A kind of descending multi-user transmission method that the embodiment of the present invention provides and device, the website adjustment up transmission time participating in descending multi-user transmission sends radio frames to AP, the described radio frames that described website sends is enable to arrive AP in admissible time error, the radio frames that each website sends comprises two parts content, Part I is the information that conventional station may identify which, Part II comprises the respective information of described website.Thus, the website of all participation downlink reception, it is possible to reply oneself available channel resource to AP simultaneously, reduce feedback overhead, improve efficiency of transmission；The conventional station audited can also identify and participate in the radio frames partial information that the website of downlink reception sends, and solves backward compatibility sex chromosome mosaicism.
Accompanying drawing explanation
Fig. 1 is the configuration diagram of Basic Service Set in prior art；
Fig. 2 is the flow chart of the descending multi-user transmission method of the embodiment of the present invention one；
Fig. 3 is the structural representation of the descending multi-user transmitting device of the embodiment of the present invention two；
Fig. 4 is each website schematic diagram one in radio frame sending time in the embodiment of the present invention；
Fig. 5 is STA1 frame structure schematic diagram over the frequency domain in the embodiment of the present invention；
Fig. 6 is STA2 frame structure schematic diagram over the frequency domain in the embodiment of the present invention；
Fig. 7 is each website schematic diagram two in radio frame sending time in the embodiment of the present invention；
Fig. 8 is another STA1 frame structure schematic diagram over the frequency domain in the embodiment of the present invention；
Fig. 9 is another STA2 frame structure schematic diagram over the frequency domain in the embodiment of the present invention；
Figure 10 is another STA1 frame structure schematic diagram over the frequency domain in the embodiment of the present invention；
Figure 11 is another STA2 frame structure schematic diagram over the frequency domain in the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the technical solution of the present invention is further elaborated.
Embodiment one
A kind of descending multi-user transmission method that the embodiment of the present invention one provides, as in figure 2 it is shown, the method specifically includes that
Step 201, participates in the website of descending multi-user transmission, adjusts the up transmission time sending radio frames to AP, makes the radio frames that described website sends can arrive AP in the time error allowed.
Distance AP website farther out compares the nearer website of distance AP, sends radio frames in advance, and lead is measured with website in advance by AP.
Step 202, website sends radio frames according to the described up transmission time to described AP；Wherein, the described radio frames that each website sends includes Part I content and the second part, and described Part I content includes the discernible information of conventional station, and described the second part includes the respective information of each website.
Wherein, described website sends radio frames on self all available sub-channel.
Wherein, the described Part I content that the radio frames that each website of participation descending multi-user transmission sends includes carries identical information.
Wherein, described Part I content includes: traditional short training sequence territory (L-STF), traditional long training sequence territory (L-LTF) and traditional signaling territory (L-SIG).
Load carrying frame Length Indication information in described L-SIG, described frame length instruction information is for indicating the length of Part I content.
Described Part I content also includes traditional data field；Described data field includes: frame type instruction information, sender address information, recipient's address information and Duration sub domain information, wherein, the frame type of described frame type information instruction legacy equipment identification or new frame type instruction information, the address information that the instruction of described sender address information is preset, described recipient's address information indicates the address information of described AP, the described Duration subdomain instruction channel booking time.
Wherein, described the second part only takes up the portion subcarriers of sub-channel used, and the portion subcarriers that each website uses is pre-assigned.
Described the second part carrying information indicate described website can band resource.
The information of described the second part carrying also indicates the channel quality information of described available band resource, and described channel quality is that signal to noise ratio or Signal to Interference plus Noise Ratio or Modulation and Coding Scheme index.
Described the second part can also be the orthogonal numeral of the website being pre-assigned to the transmission of described participation descending multi-user.
Embodiment two
Corresponding descending multi-user transmission method described in above-described embodiment one, the embodiment of the present invention two additionally provides a kind of descending multi-user transmitting device, is applied to participate in the website that descending multi-user transmits, as it is shown on figure 3, this device includes:
Time adjustment unit 10, for adjusting the website up transmission time to AP transmission radio frames of described participation descending multi-user transmission, makes the radio frames that described website sends can arrive AP in the time error allowed；
Transmitting element, for sending radio frames according to the described up transmission time to described AP；
Wherein, the described radio frames that each website sends includes Part I content and the second part, and described Part I content includes the discernible information of conventional station, and described the second part includes the respective information of each website.
Described transmitting element 20 is further used for, and sends radio frames on all available sub-channels of website.
Wherein, the described Part I content that the radio frames that each website of participation descending multi-user transmission sends includes carries identical information.
Described Part I content includes: L-STF, L-LTF and L-SIG.
Load carrying frame Length Indication information in described L-SIG, described frame length instruction information is for indicating the length of Part I content.
Described Part I content also includes traditional data field.
Described data field includes: frame type instruction information, sender address information, recipient's address information and Duration sub domain information；
The frame type of described frame type information instruction legacy equipment identification or new frame type instruction information, the address information that the instruction of described sender address information is preset, described recipient's address information indicates the address information of described AP, the described Duration subdomain instruction channel booking time.
Wherein, described the second part only takes up the portion subcarriers of sub-channel used, and the portion subcarriers that each website uses is pre-assigned.
Described the second part carrying information indicate described website can band resource.
The information of described the second part carrying may further indicate that the channel quality information of described available band resource, and described channel quality is that signal to noise ratio or Signal to Interference plus Noise Ratio or Modulation and Coding Scheme index.
Described the second part can also be the orthogonal numeral of the website being pre-assigned to the transmission of described participation descending multi-user.
Pass through the above embodiment of the present invention, the website adjustment up transmission time participating in descending multi-user transmission sends radio frames to AP, the described radio frames that described website sends is enable to arrive AP in admissible time error, the radio frames that each website sends comprises two parts content, Part I is the information that conventional station may identify which, Part II comprises the respective information of described website.Thus, the website of all participation downlink reception, it is possible to reply oneself available channel resource to AP simultaneously, reduce feedback overhead, improve efficiency of transmission；The conventional station audited can also identify and participate in the radio frames partial information that the website of downlink reception sends, and solves backward compatibility sex chromosome mosaicism.
In conjunction with instantiation, above-mentioned descending multi-user transmission method and device are further elaborated on below.
Embodiment three
In a Basic Service Set, it is assumed that there are 1 AP and 5 websites (being individually identified as STA1, STA2, STA3, STA4 and STA5), and AP and STA1, STA2, STA3, STA4 website are all consistent with the equipment of IEEE802.11ax standard；STA5 is a legacy equipment, and so-called legacy equipment can be consistent with the equipment of IEEE802.11a/g/n/ac standard.Assuming that AP and 4 11ax websites (STA1, STA2, STA3, STA4) all support that the bandwidth of 80MHz sends and receives, AP dispatches STA1, STA2, STA3 and STA4 carry out descending multi-user OFDMA transmission, and the minimum scheduling granularity of frequency domain is 20MHz.In current WLAN standards, 20MHz is a basic subchannel bandwidth, and scheduling granularity 20MHz is equivalent to the scheduling of sub-channel level, and available bandwidth comprises 4 schedulable 20MHz bandwidth；Assuming that first 20MHz bandwidth is referred to as main channel or the first sub-channel, the sub-channel of all the other 20MHz is referred to as the second sub-channel, the 3rd sub-channel and the 4th sub-channel.
AP sends a radio frames in 80MHz bandwidth, and this radio frames uses 20MHz frame format to set up, and each 20MHz bandwidth in 80MHz bandwidth sends with the pattern repeated, namely carries identical and complete information in each 20MHz bandwidth.
After STA1, STA2, STA3 and STA4 receive above-mentioned radio frames, set up feedback radio frames according to current reception condition；The subcarrier that STA1, STA2, STA3 and STA4 use at the Part II of radio frames is allocated in advance, assuming that use t easet ofasubcarriers SC1, SC2, SC3 and SC4 respectively, (number of t easet ofasubcarriers can be predefined good, can also divide according to pre-defined rule according to current scheduling user number), the intersection of 4 t easet ofasubcarriers is all subcarriers or sub-carrier subset on a sub-channel of 20MHz.
STA1 detects that the channel condition around oneself only has the first sub-channels to use, namely the sub-channel of main 20MHz can be used, thus setting up radio frames on this sub-channel, its frame structure is as it is shown in figure 5, the Part I of radio frames comprises L-STF (Legacy practices sequence territory), L-LTF (tradition long training sequence territory) and L-SIG (traditional signaling message territory) this three part；Wherein, the length subdomain in L-SIG fills in the information identical with other websites with speed subdomain, and the two informix indicates this radio frames finish time namely to terminate at L-SIG；The Part II of radio frames, namely only carries information on the subcarrier of t easet ofasubcarriers SC1 instruction, and the information of carrying is a predefined signal, and its remaining sub-carriers does not carry information；STA1 sends radio frames within the time of regulation on the first sub-channel (i.e. the sub-channel of main 20MHz).
STA2 detects that the channel condition around oneself has the first sub-channels and the second sub-channels to use, thus setting up radio frames on two sub-channels, as shown in Figure 6, the information of the radio frames carrying on the sub-channel of the two is consistent for its frame structure；The Part I of radio frames comprises this three part of L-STF, L-LTF and L-SIG；Wherein, the length subdomain in L-SIG fills in the information identical with other websites with speed subdomain, and the two informix indicates this radio frames finish time namely to terminate at L-SIG；The Part II of radio frames, namely only carries information on the subcarrier of t easet ofasubcarriers SC2 instruction, and the information of carrying is a predefined signal, and its remaining sub-carriers does not carry information；STA2 sends radio frames, the identical information of carrying on the sub-channel of the two within the time of regulation on the first sub-channels and the second sub-channels.
STA3 detects that the channel condition around oneself has the 3rd sub-channels to use, thus setting up radio frames on this sub-channel, the Part I of radio frames comprises this three part of L-STF, L-LTF and L-SIG；Wherein, the length subdomain in L-SIG fills in the information identical with other websites with speed subdomain, and the two informix indicates this radio frames finish time namely to terminate at L-SIG；The Part II of radio frames, namely only carries information on the subcarrier of t easet ofasubcarriers SC3 instruction, and the information of carrying is a predefined signal, and its remaining sub-carriers does not carry information；STA3 sends radio frames within the time of regulation on the 3rd sub-channel.
The channel condition loss of fecundity channel that STA4 detects around oneself can be used, thus not setting up radio frames.
After the website of participation descending multi-user OFDMA transmission has sent above-mentioned radio frames, 3 radio frames (radio frames that namely STA1, STA2 and STA3 send) can in the scope that synchronous error allows simultaneously or approximate arrival AP simultaneously, the AP Part II according to the radio frames being superimposed, namely would know that, by analyzing each t easet ofasubcarriers on different sub-channel, the sub-channel that each website participating in descending multi-user OFDMA transmission is currently available；Such as: AP detects predefined information on t easet ofasubcarriers SC1 and the SC2 of the first sub-channel, namely the first sub-channel known around STA1 and STA2 is each in wireless environment can be used, being not detected by predefined information on t easet ofasubcarriers SC3 and the SC4 of the first sub-channel, the first sub-channel that namely would know that around STA3 and STA4 is each in wireless environment is unavailable；AP detects predefined information at the t easet ofasubcarriers SC2 of the second sub-channel, and the second sub-channel namely known around STA2 in wireless environment can be used；Being not detected by predefined information on t easet ofasubcarriers SC1, SC3 and the SC4 of the second sub-channel, the second sub-channel that namely would know that around STA1, STA3 and STA4 are each in wireless environment is unavailable；The rest may be inferred, and AP can know that only STA3 can use the 3rd sub-channel, it does not have website can use the 4th sub-channel.
Legacy equipment STA5 receives any one radio frames of 3 11ax equipment transmissions or the superposition of multiple radio frames, may identify which Part I, and know that namely radio frames arrives L-SIG and terminate by the L-SIG in Part I, thus further not receiving second following portion.
In the present embodiment, each site STA 1, STA2 and STA3 schematic diagram in radio frame sending time is as shown in Figure 4, each website sends the up transmission time of radio frames by adjusting to AP, enable radio frames that each website sends in admissible time error simultaneously or approximate while arrival AP.
Embodiment four
In a Basic Service Set, it is assumed that there are 1 AP and 5 websites (being individually identified as STA1, STA2, STA3, STA4 and STA5), and AP and STA1, STA2, STA3, STA4 website are all consistent with the equipment of IEEE802.11ax standard；STA5 is a legacy equipment, and so-called legacy equipment can be consistent with the equipment of IEEE802.11a/g/n/ac standard.Assuming that AP and 4 11ax websites (STA1, STA2, STA3, STA4) all support that the bandwidth of 80MHz sends and receives, AP dispatches STA1, STA2, STA3 and STA4 carry out descending multi-user OFDMA transmission, and the minimum scheduling granularity of frequency domain is 20MHz.In current WLAN standards, 20MHz is a basic subchannel bandwidth, and scheduling granularity 20MHz is equivalent to the scheduling of sub-channel level, and available bandwidth comprises 4 schedulable 20MHz bandwidth；Assuming that first 20MHz bandwidth is referred to as main channel or the first sub-channel, the sub-channel of all the other 20MHz, it is referred to as the second sub-channel, the 3rd sub-channel and the 4th sub-channel.
AP sends a radio frames in 80MHz bandwidth, and this radio frames uses 20MHz frame format to set up, and each 20MHz bandwidth in 80MHz bandwidth sends with the pattern repeated, namely carries identical and complete information in each 20MHz bandwidth.
After STA1, STA2, STA3 and STA4 receive above-mentioned radio frames, set up feedback radio frames according to current reception condition；The subcarrier that STA1, STA2, STA3 and STA4 use at the Part II of radio frames is allocated in advance, assuming that use t easet ofasubcarriers SC1, SC2, SC3 and SC4 respectively, (number of t easet ofasubcarriers can be predefined good, can also divide according to pre-defined rule according to current scheduling user number), the intersection of 4 t easet ofasubcarriers is all subcarriers or sub-carrier subset on a sub-channel of 20MHz.
STA1 detects that the channel condition around oneself only has the first sub-channels to use, namely the sub-channel of main 20MHz can be used, thus setting up radio frames on this sub-channel, as shown in Figure 8, the Part I of radio frames comprises L-STF, L-LTF, L-SIG and this four part of data field (DATA) to its frame structure；Wherein, length subdomain in L-SIG fills in the information identical with other websites with speed subdomain, the two informix indicates this radio frames finish time namely to terminate at the data field of Part I, the modulation coding mode that speed subdomain instruction Part I data field adopts；Data field part is including at least frame type instruction information, sender address information, recipient's address information and Duration sub domain information, wherein, frame type information can be the frame type of legacy equipment identification can also be a new frame type instruction information, one default address information of sender address information solicitation, recipient's address information fills in AP address, Duration subdomain one the channel booking time of instruction, data field part also carries information identical with other websites, to ensure that each website sends the Part I carrying identical information of radio frames.The Part II of radio frames, namely on the subcarrier of t easet ofasubcarriers SC1 instruction, only carry information, the information of carrying is the channel quality information of the first sub-channel that STA1 measurement obtains, channel quality information is specifically as follows channel SNRs or Signal to Interference plus Noise Ratio or modulating-coding index etc., and its remaining sub-carriers does not carry information；STA1 sends radio frames within the time of regulation on the first sub-channel.
STA2 detects that the channel condition around oneself has the first sub-channels and the second sub-channels to use, thus setting up radio frames on two sub-channels, the information of the radio frames Part I carrying on two sub-channels is consistent, Part II carries the channel quality information of respective sub-channel, and its frame structure is as shown in Figure 9；The Part I of radio frames comprises L-STF, L-LTF and L-SIG and this four part of data field, wherein, length subdomain in L-SIG fills in the information identical with other websites with speed subdomain, the two informix indicates this radio frames finish time namely to terminate at Part I data field, the modulation coding mode that speed subdomain instruction Part I data field adopts；Data field part is including at least frame type instruction information, sender address information, recipient's address information and Duration sub domain information, wherein, frame type information can be the frame type of legacy equipment identification can also be a new frame type instruction information, one default address information of sender address information solicitation, recipient's address information fills in AP address, Duration subdomain one the channel booking time of instruction, data field part also carries information identical with other websites, to ensure that each website sends the Part I carrying identical information of radio frames.The Part II of radio frames, namely on the subcarrier of t easet ofasubcarriers SC2 instruction, only carry information, the information of carrying is the channel quality information of the first sub-channel of obtaining of STA2 measurement and the second sub-channel, and channel quality information is specifically as follows channel SNRs or Signal to Interference plus Noise Ratio or modulating-coding index etc.；STA2 sends radio frames within the time of regulation on the first sub-channels and the second sub-channels.
STA3 detects that the channel condition around oneself has the 3rd sub-channels to use, thus setting up radio frames on this sub-channel, the Part I of radio frames comprises L-STF, L-LTF and L-SIG and this four part of data field, wherein, length subdomain in L-SIG fills in the information identical with other websites with speed subdomain, the two informix indicates this radio frames finish time namely to terminate at Part I data field, the modulation coding mode that speed subdomain instruction Part I data field adopts；Data field part is including at least frame type instruction information, sender address information, recipient's address information and Duration sub domain information, wherein, frame type information can be the frame type of legacy equipment identification can also be a new frame type instruction information, one default address information of sender address information solicitation, recipient's address information fills in AP address, Duration subdomain one the channel booking time of instruction, data field part also carries information identical with other websites, to ensure that each website sends the Part I carrying identical information of radio frames；The Part II of radio frames, namely on the subcarrier of t easet ofasubcarriers SC3 instruction, only carry information, the information of carrying is the channel quality information of the 3rd sub-channel that STA3 measurement obtains, channel quality information is specifically as follows channel SNRs or Signal to Interference plus Noise Ratio or modulating-coding index etc., and its remaining sub-carriers does not carry information；STA3 sends radio frames within the time of regulation on the 3rd sub-channel.
The channel condition loss of fecundity channel that STA4 detects around oneself can be used, thus not setting up radio frames.
After the website of participation descending multi-user OFDMA transmission has sent above-mentioned radio frames, 3 radio frames (radio frames that namely STA1, STA2 and STA3 send) can in the scope that synchronous error allows simultaneously or approximate arrive AP simultaneously, the AP Part II according to the radio frames being superimposed, the sub-channel currently available by each website of analyzing each t easet ofasubcarriers on different sub-channel namely to would know that to participate in descending multi-user OFDMA transmission and channel quality；Such as: AP detects predefined information on t easet ofasubcarriers SC1 and the SC2 of the first sub-channel, namely know that the first sub-channel in STA1 and STA2 each around wireless environment can be used and the channel quality of correspondence, being not detected by predefined information on t easet ofasubcarriers SC3 and the SC4 of the first sub-channel, the first sub-channel that namely would know that around STA3 and STA4 is each in wireless environment is unavailable；AP detects predefined information at the t easet ofasubcarriers SC2 of the second sub-channel, and the second sub-channel namely known around STA2 in wireless environment can be used and the channel quality of correspondence；Being not detected by predefined information on t easet ofasubcarriers SC1, SC3 and the SC4 of the second sub-channel, the second sub-channel that namely would know that around STA1, STA3 and STA4 are each in wireless environment is unavailable；The rest may be inferred, and AP can know that only STA3 can use the channel quality of the 3rd sub-channel and correspondence, it does not have website can use the 4th sub-channel.
Legacy equipment STA5 receives any one radio frames of 3 11ax equipment transmissions or the superposition of multiple radio frames, may identify which Part I, and the length of radio frames is known by the L-SIG in Part I, complete radio frames according to this length and receive (receiving only radio frames Part I), the channel booking time can be known by resolving the Duration in Part I data field.
In the present embodiment, each site STA 1, STA2 and STA3 schematic diagram in radio frame sending time is as shown in Figure 7, each website sends the up transmission time of radio frames by adjusting to AP, enable radio frames that each website sends in admissible time error simultaneously or approximate while arrival AP.
Embodiment five
In a Basic Service Set, it is assumed that there are 1 AP and 5 websites (being individually identified as STA1, STA2, STA3, STA4 and STA5), and AP and STA1, STA2, STA3, STA4 website are all consistent with the equipment of IEEE802.11ax standard；STA5 is a legacy equipment, and so-called legacy equipment can be consistent with the equipment of IEEE802.11a/g/n/ac standard.Assuming that AP and 4 11ax websites (STA1, STA2, STA3, STA4) all support that the bandwidth of 80MHz sends and receives, AP dispatches STA1, STA2, STA3 and STA4 carry out descending multi-user OFDMA transmission, and the minimum scheduling granularity of frequency domain is 20MHz.In current WLAN standards, 20MHz is a basic subchannel bandwidth, scheduling granularity 20MHz is equivalent to the scheduling of sub-channel level, available bandwidth comprises 4 schedulable 20MHz bandwidth, assuming that first 20MHz bandwidth is referred to as main channel or the first sub-channel, the sub-channel of all the other 20MHz is referred to as the second sub-channel, the 3rd sub-channel and the 4th sub-channel.
AP sends a radio frames in 80MHz bandwidth, and this radio frames uses 20MHz frame format to set up, and each 20MHz bandwidth in 80MHz bandwidth sends with the pattern repeated, namely carries identical and complete information in each 20MHz bandwidth.
After STA1, STA2, STA3 and STA4 receive above-mentioned radio frames, set up feedback radio frames according to current reception condition；The numeral that STA1, STA2, STA3 and STA4 use at the Part II of radio frames is predefined, mutually orthogonal or accurate orthogonal between numeral.
STA1 detects that the channel condition around oneself only has the first sub-channels to use, namely the sub-channel of main 20MHz can be used, thus setting up radio frames on this sub-channel, its frame structure is as shown in Figure 10, the Part I of radio frames comprises this three part of L-STF, L-LTF and L-SIG, wherein, the length subdomain in L-SIG fills in the information identical with other websites with speed subdomain, and the two informix indicates this radio frames finish time namely to terminate at L-SIG；The Part II of radio frames, the information of carrying is a preallocated orthogonal numeral；STA1 sends radio frames within the time of regulation on the first sub-channel.
STA2 detects that the channel condition around oneself has the first sub-channels and the second sub-channels to use, thus setting up radio frames on the sub-channel of the two, as shown in figure 11, the information of the radio frames carrying on two sub-channels is consistent for its frame structure；The Part I of radio frames comprises this three part of L-STF, L-LTF and L-SIG, and wherein, the length subdomain in L-SIG fills in the information identical with other websites with speed subdomain, and the two informix indicates this radio frames finish time namely to terminate at L-SIG；The Part II of radio frames, the information of carrying is a preallocated orthogonal numeral, and the numeral on the first sub-channel and the second sub-channel is identical；STA2 sends radio frames, the identical information of carrying on the sub-channel of the two within the time of regulation on the first sub-channels and the second sub-channels.
STA3 detects that the channel condition around oneself has the 3rd sub-channels to use, thus setting up radio frames on this sub-channel, the Part I of radio frames comprises this three part of L-STF, L-LTF and L-SIG, wherein, length subdomain in L-SIG fills in the information identical with other websites with speed subdomain, and the two informix indicates this radio frames finish time namely to terminate at L-SIG；The Part II of radio frames, namely only carries information on the subcarrier of t easet ofasubcarriers SC3 instruction, and the information of carrying is a predefined numeral；STA3 sends radio frames within the time of regulation on the 3rd sub-channel.
The channel condition loss of fecundity channel that STA4 detects around oneself can be used, thus not setting up radio frames.
After the website of participation descending multi-user OFDMA transmission has sent above-mentioned radio frames, 3 radio frames (radio frames that namely STA1, STA2 and STA3 send) can in the scope that synchronous error allows simultaneously or approximate arrive AP simultaneously, the AP Part II according to the radio frames being superimposed, by analyzing the orthogonal numeral on different sub-channel, namely would know that the sub-channel that each website participating in downlink OFDMA transmission is currently available；Such as: AP detects the numeral of numeral and the STA2 distributing to STA1 on the first sub-channel, the first sub-channel namely known around STA1 and STA2 is each in wireless environment can be used；Being not detected by the first sub-channel to the numeral distributing to STA3, STA4, the first sub-channel that namely would know that around STA3 and STA4 is each in wireless environment is unavailable；AP detects, on the second sub-channel, the numeral distributing to STA2, and the second sub-channel namely known around STA2 in wireless environment can be used；Being not detected by distributing to the numeral of STA1, STA3 and STA4 on the second sub-channel, the second sub-channel that namely would know that around STA1, STA3 and STA4 are each in wireless environment is unavailable；The rest may be inferred, and AP can know that only STA3 can use the 3rd sub-channel, it does not have website can use the 4th sub-channel.
Legacy equipment STA5 receives any one radio frames of 3 11ax equipment transmissions or the superposition of multiple radio frames, may identify which Part I, and know that namely radio frames arrives L-SIG and terminate by the L-SIG in Part I, further do not receive second following portion.
Embodiment six
In a Basic Service Set, it is assumed that there are 1 AP and 5 websites (being individually identified as STA1, STA2, STA3, STA4 and STA5), and AP and STA1, STA2, STA3, STA4 website are all consistent with the equipment of IEEE802.11ax standard；STA5 is a legacy equipment, and so-called legacy equipment can be consistent with the equipment of IEEE802.11a/g/n/ac standard.Assuming that AP and 4 11ax websites (STA1, STA2, STA3, STA4) all support that the bandwidth of 80MHz sends and receives, AP dispatches STA1, STA2, STA3 and STA4 carry out descending multi-user OFDMA transmission, the minimum scheduling granularity of frequency domain is nMHz, and every sub-channels is segmented into N number of subband.In current WLAN standards, 20MHz is a basic subchannel bandwidth；Assuming that system available channel bandwidth is 80MHz, first 20MHz bandwidth is referred to as main channel or the first sub-channel, and the sub-channel of all the other 20MHz is referred to as the second sub-channel, the 3rd sub-channel and the 4th sub-channel.
AP sends a radio frames in 80MHz bandwidth, and this radio frames uses 20MHz frame format to set up, and each 20MHz bandwidth in 80MHz bandwidth sends with the pattern repeated, namely carries identical and complete information in each 20MHz bandwidth.
After STA1, STA2, STA3 and STA4 receive above-mentioned radio frames, set up feedback radio frames according to current reception condition；The subcarrier that STA1, STA2, STA3 and STA4 use at the Part II of radio frames is allocated in advance, assuming that use t easet ofasubcarriers SC1, SC2, SC3 and SC4 respectively, (number of t easet ofasubcarriers can be predefined good, can also divide according to pre-defined rule according to current scheduling user number), the intersection of 4 t easet ofasubcarriers is all subcarriers or sub-carrier subset on a sub-channel of 20MHz.
STA1 detects that the channel condition around oneself only has the first sub-channels to use, and namely the sub-channel of main 20MHz can be used, thus setting up radio frames on this sub-channel, the Part I of radio frames comprises L-STF, L-LTF, L-SIG and this four part of data field；Wherein, length subdomain in L-SIG fills in the information identical with other websites with speed subdomain, the two informix indicates this radio frames finish time namely to terminate at Part I data field, the modulation coding mode that speed subdomain instruction Part I data field adopts；Data field part is including at least frame type instruction information, sender address information, recipient's address information and Duration sub domain information, wherein, frame type information can be the frame type of legacy equipment identification can also be a new frame type instruction information, one default address information of sender address information solicitation, recipient's address information fills in AP address, Duration subdomain one the channel booking time of instruction, data field part also carries information identical with other websites, to ensure that each website sends the Part I carrying identical information of radio frames；The Part II of radio frames, namely on the subcarrier of t easet ofasubcarriers SC1 instruction, only carry information, the information of carrying is that the index of the channel quality information of each subband on the first sub-channel of obtaining of STA1 measurements or best x the subband of channel quality indicates and sub-band channel quality information accordingly, channel quality information is specifically as follows channel SNRs or Signal to Interference plus Noise Ratio or modulating-coding index etc., and its remaining sub-carriers does not carry information；STA1 sends radio frames within the time of regulation on the first sub-channel.
STA2 detects that the channel condition around oneself has the first sub-channels and the second sub-channels to use, thus setting up radio frames on the sub-channel of the two, the information of the radio frames Part I carrying on two sub-channels is consistent, and Part II carries the channel quality information of respective sub-channel；nullThe Part I of radio frames comprises L-STF、L-LTF、L-SIG and this four part of data field，Wherein，Length subdomain in L-SIG fills in the information identical with other websites with speed subdomain，The two informix indicates this radio frames finish time namely to terminate at Part I data field，The modulation coding mode that speed subdomain instruction Part I data field adopts，Data field part is including at least frame type instruction information、Sender address information、Recipient's address information and Duration sub domain information，Wherein，Frame type information can be the frame type of legacy equipment identification can also be a new frame type instruction information，One default address information of sender address information solicitation，Recipient's address information fills in AP address，Duration subdomain one the channel booking time of instruction，Data field part also carries information identical with other websites，To ensure that each website sends the Part I carrying identical information of radio frames；The Part II of radio frames, namely on the subcarrier of t easet ofasubcarriers SC2 instruction, only carry information, the information of carrying is that the index of the channel quality information of each subband on the first sub-channel of obtaining of STA2 measurements and the second sub-channel or best x the subband of channel quality indicates and sub-band channel quality information accordingly, channel quality information is specifically as follows channel SNRs or Signal to Interference plus Noise Ratio or modulating-coding index etc., and STA2 sends radio frames within the time of regulation on the first sub-channels and the second sub-channels.
nullSTA3 detects that the channel condition around oneself has the 3rd sub-channels to use，Thus setting up radio frames on this sub-channel，The Part I of radio frames comprises L-STF、L-LTF、L-SIG and this four part of data field，Wherein，Length subdomain in L-SIG fills in the information identical with other websites with speed subdomain，The two informix indicates this radio frames finish time namely to terminate at Part I data field，The modulation coding mode that speed subdomain instruction Part I data field adopts，Data field part is including at least frame type instruction information、Sender address information、Recipient's address information and Duration sub domain information，Wherein，Frame type information can be the frame type of legacy equipment identification can also be a new frame type instruction information，One default address information of sender address information solicitation，Recipient's address information fills in AP address，Duration subdomain one the channel booking time of instruction，Data field part also carries information identical with other websites，To ensure that each website sends the Part I carrying identical information of radio frames；The Part II of radio frames, namely on the subcarrier of t easet ofasubcarriers SC3 instruction, only carry information, the information of carrying is that the index of the channel quality information of each subband upper of the 3rd sub-channel that STA3 measurements obtains or best x the subband of channel quality indicates and sub-band channel quality information accordingly, channel quality information can be channel SNRs or Signal to Interference plus Noise Ratio or modulating-coding index etc., and its remaining sub-carriers does not carry information；STA3 sends radio frames within the time of regulation on the 3rd sub-channel.
The channel condition loss of fecundity channel that STA4 detects around oneself can be used, thus not setting up radio frames.
After the website of participation descending multi-user OFDMA transmission has sent above-mentioned radio frames, 3 radio frames (radio frames that namely STA1, STA2 and STA3 send) can in the scope that synchronous error allows simultaneously or approximate arrive AP simultaneously, the AP Part II according to the radio frames being superimposed, namely would know that the channel quality of each subband or part subband on the sub-channel that each website participating in descending multi-user OFDMA transmission is currently available by analyzing each t easet ofasubcarriers on different sub-channel；Such as: AP has detected carrying information on t easet ofasubcarriers SC1 and the SC2 of the first sub-channel, namely the channel quality of each subband or x best subband on the first sub-channel known around STA1 and STA2 is each in wireless environment, being not detected by predefined information on t easet ofasubcarriers SC3 and the SC4 of the first sub-channel, the first sub-channel that namely would know that around STA3 and STA4 is each in wireless environment is unavailable；AP has detected carrying information at the t easet ofasubcarriers SC2 of the second sub-channel, the channel quality of each subband or x best subband on the second sub-channel namely known around STA2 in wireless environment；Being not detected by predefined information on t easet ofasubcarriers SC1, SC3 and the SC4 of the second sub-channel, the second sub-channel that namely would know that around STA1, STA3 and STA4 are each in wireless environment is unavailable；The rest may be inferred, and AP can know STA3 channel quality of each subband or x best subband on the 3rd sub-channel, and STA2, STA1 and STA4 do not use the 3rd sub-channel, can use the 4th sub-channel also without website.
Legacy equipment STA5 receives any one radio frames of 3 11ax equipment transmissions or the superposition of multiple radio frames, may identify which Part I, and the length of radio frames is known by the L-SIG in Part I, complete radio frames according to this length and receive (receiving only radio frames Part I), the channel booking time can be known by resolving the Duration in Part I data field.
In sum, in the embodiment of the present invention, the website adjustment up transmission time participating in descending multi-user transmission sends radio frames to AP, the described radio frames that described website sends is enable to arrive AP in admissible time error, the radio frames that each website sends comprises two parts content, Part I is the information that conventional station may identify which, Part II comprises the respective information of described website.Thus, the website of all participation downlink reception, it is possible to reply oneself available channel resource to AP simultaneously, reduce feedback overhead, improve efficiency of transmission；The conventional station audited can also identify and participate in the radio frames partial information that the website of downlink reception sends, and solves backward compatibility sex chromosome mosaicism.
Those skilled in the art are it should be appreciated that embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of hardware embodiment, software implementation or the embodiment in conjunction with software and hardware aspect.And, the present invention can adopt the form at one or more upper computer programs implemented of computer-usable storage medium (including but not limited to disk memory and optical memory etc.) wherein including computer usable program code.
The present invention is that flow chart and/or block diagram with reference to method according to embodiments of the present invention, equipment (system) and computer program describe.It should be understood that can by the combination of the flow process in each flow process in computer program instructions flowchart and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can be provided to produce a machine to the processor of general purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device so that the instruction performed by the processor of computer or other programmable data processing device is produced for realizing the device of function specified in one flow process of flow chart or multiple flow process and/or one square frame of block diagram or multiple square frame.
These computer program instructions may be alternatively stored in and can guide in the computer-readable memory that computer or other programmable data processing device work in a specific way, the instruction making to be stored in this computer-readable memory produces to include the manufacture of command device, and this command device realizes the function specified in one flow process of flow chart or multiple flow process and/or one square frame of block diagram or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices provides for realizing the step of function specified in one flow process of flow chart or multiple flow process and/or one square frame of block diagram or multiple square frame.
The above, be only presently preferred embodiments of the present invention, is not intended to limit protection scope of the present invention.
Claims (23)
1. a descending multi-user transmission method, it is characterised in that described method includes:
Participate in the website of descending multi-user transmission, adjust the up transmission time sending radio frames to access point AP, make the radio frames that described website sends can arrive AP in the time error allowed；
Described website sends radio frames according to the described up transmission time to described AP；
Wherein, the described radio frames that each website sends includes Part I content and the second part, and described Part I content includes the discernible information of conventional station, and described the second part includes the respective information of each website.
2. descending multi-user transmission method according to claim 1, it is characterised in that described website sends radio frames on self all available sub-channel.
3. descending multi-user transmission method according to claim 1, it is characterised in that participate in carrying identical information in the described Part I content that the radio frames that each website of descending multi-user transmission sends includes.
4. descending multi-user transmission method according to claim 3, it is characterised in that described Part I content includes: traditional short training sequence territory L-STF, traditional long training sequence territory L-LTF and traditional signaling territory L-SIG.
5. descending multi-user transmission method according to claim 4, it is characterised in that load carrying frame Length Indication information in described L-SIG, described frame length instruction information is for indicating the length of Part I content.
6. descending multi-user transmission method according to claim 3, it is characterised in that described Part I content also includes traditional data field.
7. descending multi-user transmission method according to claim 6, it is characterised in that described data field includes: frame type instruction information, sender address information, recipient's address information and Duration sub domain information；
Wherein, the frame type of described frame type information instruction legacy equipment identification or new frame type instruction information, the address information that the instruction of described sender address information is preset, described recipient's address information indicates the address information of described AP, the described Duration subdomain instruction channel booking time.
8. descending multi-user transmission method according to any one of claim 2 to 7, it is characterised in that the second part of described each user is only carried on the portion subcarriers of sub-channel used, and the portion subcarriers that each website uses is pre-assigned.
9. descending multi-user transmission method according to claim 8, it is characterised in that the information of described the second part carrying indicate described website can band resource.
10. descending multi-user transmission method according to claim 8, it is characterized in that, the information of described the second part carrying indicates the channel quality information of described available band resource, and described channel quality is that signal to noise ratio or Signal to Interference plus Noise Ratio or Modulation and Coding Scheme index.
11. descending multi-user transmission method according to claim 1, it is characterised in that described the second part is the orthogonal numeral of the website being pre-assigned to the transmission of described participation descending multi-user.
12. descending multi-user transmission method according to claim 1, it is characterised in that the described moment arriving the AP described radio frames referring to that each user sends arrival AP in the time error allowed meets the synchronization accuracy demand of system multi-user uplink.
13. a descending multi-user transmitting device, it is characterised in that being applied to participate in the website that descending multi-user transmits, described device includes:
Time adjustment unit, for adjusting the website up transmission time to access point AP transmission radio frames of described participation descending multi-user transmission, makes the radio frames that described website sends can arrive AP in the time error allowed；
Transmitting element, for sending radio frames according to the described up transmission time to described AP；
Wherein, the described radio frames that each website sends includes Part I content and the second part, and described Part I content includes the discernible information of conventional station, and described the second part includes the respective information of each website.
14. descending multi-user transmitting device according to claim 13, it is characterised in that described transmitting element is further used for, all available sub-channels of website send radio frames.
15. descending multi-user transmitting device according to claim 13, it is characterised in that carry identical information in the described Part I content that the radio frames that each website of participation descending multi-user transmission sends includes.
16. descending multi-user transmitting device according to claim 15, it is characterised in that described Part I content includes: traditional short training sequence territory L-STF, traditional long training sequence territory L-LTF and traditional signaling territory L-SIG.
17. descending multi-user transmitting device according to claim 16, it is characterised in that load carrying frame Length Indication information in described L-SIG, described frame length instruction information is for indicating the length of Part I content.
18. descending multi-user transmitting device according to claim 16, it is characterised in that described Part I content also includes traditional data field.
19. descending multi-user transmitting device according to claim 18, it is characterised in that described data field includes: frame type instruction information, sender address information, recipient's address information and Duration sub domain information；
Wherein, the frame type of described frame type information instruction legacy equipment identification or new frame type instruction information, the address information that the instruction of described sender address information is preset, described recipient's address information indicates the address information of described AP, the described Duration subdomain instruction channel booking time.
20. descending multi-user transmitting device according to any one of claim 14 to 19, it is characterised in that described the second part only takes up the portion subcarriers of sub-channel used, and the portion subcarriers that each website uses is pre-assigned.
21. descending multi-user transmitting device according to claim 20, it is characterised in that described the second part carrying information indicate described website can band resource.
22. descending multi-user transmitting device according to claim 20, it is characterized in that, the information of described the second part carrying indicates the channel quality information of described available band resource, and described channel quality is that signal to noise ratio or Signal to Interference plus Noise Ratio or Modulation and Coding Scheme index.
23. descending multi-user transmitting device according to any one of claim 14 to 19, it is characterised in that described the second part is the orthogonal numeral of the website being pre-assigned to the transmission of described participation descending multi-user.
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| CN201410852290.2A CN105813141A (en) | 2014-12-31 | 2014-12-31 | Downlink multiuser transmission method and device |
| PCT/CN2015/100015 WO2016107590A1 (en) | 2014-12-31 | 2015-12-30 | Downlink multi-user transmission method and device |
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| CN201410852290.2A CN105813141A (en) | 2014-12-31 | 2014-12-31 | Downlink multiuser transmission method and device |
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Application publication date: 20160727 |