CN101656644A - Access point device, mobile terminal, wireless communication system and control method of wireless communication system - Google Patents
Access point device, mobile terminal, wireless communication system and control method of wireless communication system Download PDFInfo
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- CN101656644A CN101656644A CN200810144969A CN200810144969A CN101656644A CN 101656644 A CN101656644 A CN 101656644A CN 200810144969 A CN200810144969 A CN 200810144969A CN 200810144969 A CN200810144969 A CN 200810144969A CN 101656644 A CN101656644 A CN 101656644A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0808—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA
- H04W74/0816—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA carrier sensing with collision avoidance
Abstract
The invention provides an access point device, a mobile terminal, a wireless communication system and a control method of the wireless communication system. The access point device of the invention comprises a physical layer module, an antenna part provided with a plurality of antennae, a request transmission control frame receiving module, an response transmission control frame sending module, anresponse data control frame sending module and a scheduling module. The request transmission control frame receiving module receives a request transmission control frame from the mobile terminal; theresponse transmission control frame sending module sends response transmission control frames to the mobile terminal, wherein the response transmission control frames comprise a temporary response transmission control frame which responds to the request transmission control frame received by the request transmission control frame receiving module and indicates that the data transmission in an uplink direction is not performed temporarily and a final response transmission control frame which indicates that the data transmission in the uplink direction is performed; when the data transmission in the uplink direction is completed, the response data control frame sending module sends an response data control frame which indicates that the data transmission in the uplink direction is completedto the mobile terminal; and the scheduling module schedules the data transmission in the uplink direction.
Description
Technical field
The present invention relates to adopt the control method of the transfer of data of the wireless communication system of MIMO (Multiple-Input Multiple-Output, multiple-input and multiple-output) and up direction thereof, and access point apparatus in this wireless communication system and portable terminal.
Background technology
In WLAN (wireless local area network) IEEE 1002.11n standard, the physical layer solution has adopted the such multi-antenna technology of MIMO-OFDMA (multi-I/O OFDM).In addition, although adopted multi-antenna technology, WLAN (wireless local area network) IEEE 1002.11n standard is not optimized the SDMA technology of supporting to the MAC layer.
In patent documentation 1 (WO 2005/022833 A2), disclose a kind of mac-layer protocol, be used for supporting the SDMA technology of down direction at wireless communication system.The information that access point apparatus sends according to portable terminal, portable terminal is divided into groups, the transfer of data of the pairing down direction of portable terminal of each group is carried out spatial reuse, solve the problem that receives a plurality of acknowledgement frames simultaneously, but channel estimating need be finished before RTS/CTS (Request To Send/Clear To Send, request sends/reply transmission) is mutual.The problem of its solution is different fully with the problem that the present invention need solve, and the technology of patent documentation 1 mainly adapts to spatial reuse by the expansion physical layer.
In patent documentation 2 (JP2007-208522A), disclose under the MIMO+SDMA mode, improve the solution of data throughput.Its main thought is to revise the frame structure of physical layer, improves automatic gain control and performance for estimating channel.But documents 2 is not considered the problem of competition, when portable terminal outnumber number of antennas on the access point apparatus time, can compete inevitably between the different mobile terminal, so, patent documentation 2 disclosed technical schemes also can't be avoided competition.In addition, patent documentation does not have up reporting mechanism yet, so its flexibility is poor.
That is to say, in up-to-date 1002.11n standard,, use maximum DCF mac-layer protocols at present, can only support same at one time terminal use to carry out transmitting uplink data based on RTS/CTS and use still at original a single aerial system design.Can't on up link, fully use the flexibility and the validity of many antennas like this.Especially for the sort of concerning postpone requiring than the higher business, this MAC mechanism can make the quality of service of a part be guaranteed.
Summary of the invention
The present invention proposes in view of the above problems, it is a kind of that its purpose is to provide, access point apparatus, portable terminal, wireless communication system and control method thereof can be carried out the transfer of data of up direction flexibly efficiently in the wireless communication system of multiple-input and multiple-output.
Access point apparatus in the wireless communication system of a kind of multiple-input and multiple-output of first scheme of the present invention, this wireless communication system also comprises portable terminal, this access point apparatus comprises: physical layer block communicates with described portable terminal; Antenna part has a plurality of antennas; Request transmission control frame receiver module, via described physical layer block, reception is from the request transmission control frame of described portable terminal, and it is the time slot of the transfer of data of up direction that this request transmission control frame is used to ask the direction from described portable terminal to described access point apparatus; Reply the transmission control frame sending module, via described physical layer block, to reply transmission control frame and send to described portable terminal, described reply transmission control frame comprise the described request transmission control frame that described request transmission control frame receiver module is received reply and represent temporarily not begin to carry out described up direction the transmission data temporarily reply transmission control frame, and expression begin to carry out described up direction the transmission data finally reply transmission control frame; Reply data control frame sending module, when the transmission ED of described up direction, the reply data control frame with the transmission ED of the described up direction of expression sends to described portable terminal; And scheduler module, the transfer of data of described up direction is dispatched.
In addition, the portable terminal in the wireless communication system of a kind of multiple-input and multiple-output of alternative plan of the present invention, this wireless communication system also comprises access point apparatus, this portable terminal comprises: physical layer block communicates with described access point apparatus; Antenna part has antenna; Request transmission control frame sending module, via described physical layer block, send the request transmission control frame to described access point apparatus, it is the time slot of the transfer of data of up direction that this request transmission control frame is used to ask the direction from described portable terminal to described access point apparatus; Reply the transmission control frame receiver module, via described physical layer block, reception is from the transmission control frame of replying of described access point apparatus, described reply transmission control frame comprise described access point apparatus the described request transmission control frame is replied and represent temporarily not begin to carry out described up direction the transmission data temporarily reply transmission control frame, and expression begin to carry out described up direction the transmission data finally reply transmission control frame; And reply data control frame receiver module, reception is from the reply data control frame of the transmission ED of the described up direction of expression of described access point apparatus.
In addition, the multiple input, multiple output wireless communication system of third party's case of the present invention comprises the access point apparatus of first scheme and the portable terminal of alternative plan.
In addition, the control method of the transfer of data of the up direction in a kind of multiple input, multiple output wireless communication system of cubic case of the present invention, this multiple input, multiple output wireless communication system comprises access point apparatus and portable terminal, described up direction is the direction from described portable terminal to described access point apparatus, the control method of the transfer of data of this up direction may further comprise the steps: steps A, described portable terminal will ask transmission control frame to send to described access point apparatus, and this request transmission control frame is used to ask the time slot of the transfer of data of described up direction; Step B, described access point apparatus receives the described request transmission control frame, and to portable terminal send to the described request transmission control frame reply and represent temporarily not begin to carry out described up direction the transmission data temporarily reply transmission control frame; Step C, described access point apparatus obtain the channel condition information of described portable terminal from the described request transmission control frame; Step D, after receiving the described request transmission control frame of all portable terminals, or after finishing between access periods at random, described access point apparatus is dispatched, so that from all portable terminals that sent the described request transmission control frame, carry out the portable terminal of the transfer of data of described up direction in selecting during next transfer of data, and respectively the selected portable terminal that goes out is distributed antenna and transmission rate; Step e, described access point apparatus is kept at finally the replying in the transmission control frame of transmission data that expression begins to carry out described up direction with the result of described scheduling, and the described transmission control frame of finally replying is issued described portable terminal; Step F, described portable terminal receive described finally reply transmission control frame after, the portable terminal during selected pool goes out is finally replied the transfer of data that transmission control frame carries out up direction according to described.
Main contribution of the present invention is to have designed an agreement based on competition to improve channel estimating and net synchronization capability.At present, most WLAN (wireless local area network) products all are based on solution (the DCF pattern: the distributed coordination function pattern) of competition.The center control model, such as super frame (super-frame) does not gear to actual circumstances in realization.In addition, because distributed treatment characteristics under the DCF pattern, in order to realize support to SDMA, the estimation of channel and can not bring the overhead and the center control messages of signaling synchronously.
Proposed a kind of new pure up mac-layer protocol among the present invention, thereby in unidirectional multi-antenna wireless LAN system, supported the SDMA technology based on competition.The present invention is based on the DCF pattern in the 1002.11MAC agreement.In order to support the SDMA transmission, expanded channel competition mechanism.
The present invention has following effect:
(1) upstream data that has not only improved mobile communications network is greatly handled up, and only existing WLAN standard 1002.11MAC layer protocol has been carried out very little modification simultaneously, thereby is very easy to realize.
(2) owing in WLAN standard 1002.11MAC layer protocol, supported variable random access time slot to be used to realize channel estimating and synchronous, the mac-layer protocol that the present invention proposes can be flexible in the extreme and efficient, when considering physical layer and MAC layer state at the same time, adjust and dispatch at channel conditions and network conforms adaptively.
(3), can support the scheduling mechanism of multi-user's up direction, thereby the mac-layer protocol that carries out center control is provided according to the present invention.
Description of drawings
Fig. 1 shows the figure of the example that the many antennas AP device in the wireless communication system of the present invention serves a plurality of terminals simultaneously.
Fig. 2 is the block diagram that schematically shows the AP device in the wireless communication system of the present invention.
Fig. 3 is the block diagram that schematically shows the terminal that is built-in with the wireless network module in the wireless communication system of the present invention.
Fig. 4 shows the block diagram that peripheral hardware in the wireless communication system of the present invention has the terminal of wireless network module.
Fig. 5 shows the figure of the message format of PCTS of the present invention.
Fig. 6 shows the figure of the message format of FCTS of the present invention.
Fig. 7 shows the figure of an example of mac-layer protocol flow process of the present invention.
Fig. 8 shows the figure of another example of mac-layer protocol flow process of the present invention.
Fig. 9 shows the workflow diagram of the end side in the wireless communication system of the present invention.
Figure 10 shows the workflow diagram of AP device side in the wireless communication system of the present invention.
Embodiment
Below, with reference to description of drawings the specific embodiment of the present invention.
Fig. 1 shows the figure of the example that the many antennas access point apparatus (being designated hereinafter simply as AP) 100 in the wireless communication system of multiple-input and multiple-output of the present invention serves a plurality of terminals simultaneously.
As shown in Figure 1, wireless communication system of the present invention comprises AP 100 and as terminal 1, terminal 2, terminal 3 and the terminal 4 of portable terminal.Wherein, AP 100 has the antenna part that comprises 3 antennas 101, and this antenna part is support terminal 1-4 simultaneously.Terminal 1 and terminal 4 are pocket telephones, and terminal 2 is portable personal computers, and terminal 3 is portable digital television machines.Air interface 10 is by a dotted line carried out the transmission of data, signaling frame etc. between AP 100 and terminal 1-4.
Fig. 2 is the block diagram that schematically shows the AP 100 in the wireless communication system of the present invention.In the explanation of this omission with the essentially identical module of prior art.
As shown in Figure 2, AP 100 of the present invention comprises: as upstream Interface and buffer module 204 and the downstream interface and the buffer module 205 of physical layer block, communicate with terminal as the user; Antenna part 206 has a plurality of antennas; Controller 203; And other modules that are provided with as required.
Wherein, controller 203 comprises with lower module: configuration parameter module 214; Scheduler module 215; Send_CTS (replying transmission control frame sends) module 216; Send_ACK (transmission of reply data control frame) module 217; And Recv_RTS (the request transmission control frame receives) module 218.
Wherein, Recv_RTS module 218, via upstream Interface and buffer module 204 and downstream interface and buffer module 205 as physical layer block, receive request transmission control frame (the Request To Send frame of self terminal, be designated hereinafter simply as RTS), it is the time slot of the transfer of data of up direction that this RTS is used to ask from the terminal to AP 100 direction.
Send_CTS module 216 is via upstream Interface and buffer module 204 and downstream interface and buffer module 205, to comprise and temporarily reply transmission control frame (Pending CTS frame, be designated hereinafter simply as PCTS) and finally reply transmission control frame (Final CTS frame, be designated hereinafter simply as FCTS) etc. reply transmission control frame Clear To Send frame, be designated hereinafter simply as CTS) send to terminal, wherein, PCTS replys the RTS that comes self terminal that Recv_RTS module 218 receives, and expression does not temporarily begin to carry out the control frame of the transmission data of up direction, and FCTS is the control frame that expression begins to carry out the transmission data of up direction.
Send_ACK module 217 is used for to terminal broadcasting reply data control frame, particularly, when the transmission ED of up direction, is that the reply data control frame sends to terminal with the ACK of the transmission ED of expression up direction.
Scheduler module 215 is dispatched the transfer of data of up direction.
Configuration parameter module 214 is used for configuration and stores various parameters, for example T as described later
TimeoutAnd M
RandomDeng.
Fig. 2 shows an example of access point apparatus of the present invention, but the invention is not restricted to this, can change as required.For example, are arranged in the controller 203 though in Fig. 2, Send_CTS module 216, Send_ACK module 217, Recv_RTS module 218, scheduler module 215 and configuration parameter module 214 concentrated, be arranged in the controller 203 but also can not concentrate, but these modules are set separately.In addition, modules such as configuration parameter module 214 can also be set as required.
In addition, the present invention can also obtain the channel condition information (CSI) of terminal by Recv_RTS module 218 from the RST that receives, send to scheduler module 215, thereby scheduler module 215 can be according to CSI, decision is PCTS or FCTS to the CTS that terminal sends.
In addition, the present invention can also pass through Send_CTS module 216, and the result with scheduler module 215 is dispatched is kept among the FCTS, and issues terminal.
In addition, scheduler module 215 of the present invention can also be dispatched, so that sent the terminal of RTS from all, selects the terminal of the transfer of data that is about to carry out up direction, and respectively to selected terminal distribution antenna and the transmission rate that goes out.
In addition, scheduler module 215 of the present invention can also comprise the unshowned control strategy module of figure, and this control strategy module is used for the strategy of the transfer of data of definite control up direction under the situation of multiple-input and multiple-output.These strategies can be with prior art tactful identical.
Fig. 3 is the block diagram that the wireless network module is the terminal 300 of built-in network interface card that is built-in with that schematically shows in the wireless communication system of the present invention, in the explanation of this omission with the essentially identical module of prior art.
As shown in Figure 3, terminal 300 comprises built-in wireless network module 301 and other modules that is provided with as required.
Built-in wireless network module 301 comprises: upstream Interface and buffer module 303 and downstream interface and buffer module 304 as physical layer block communicate with access point apparatus; Antenna part 303 has antenna; MAC firmware 302.
Wherein, MAC firmware 302 comprises controller 310.Controller 310 comprises Recv_CTS (replying transmission control frame receives) module 311, configuration parameter module 312, Send_RTS (the request transmission control frame sends) module 313, Recv_ACK (reception of reply data control frame) module 314 and other modules 315.
Wherein, Send_RTS module 313 is via upstream Interface and buffer module 303 and downstream interface and buffer module 304 as physical layer block, send RTS to access point apparatus, it is the time slot of the transfer of data of up direction that this RTS is used to ask the direction from the terminal to the access point apparatus.
Fig. 3 shows an example of portable terminal of the present invention, but the invention is not restricted to this, can change as required.For example, though in Fig. 2, Recv_CTS module 311, configuration parameter module 312, Send_RTS module 313, Recv_ACK module 314 and other modules 315 concentrated and be arranged on controllers 310, and controller 310 is also used as scheduler module, be arranged in the controller 310 but also can not concentrate, but these modules are set separately.In addition, modules such as configuration parameter module 312 can also be set as required.
Fig. 4 shows the outer wireless network module that is located on the portable terminal in the wireless communication system of the present invention, the i.e. block diagram of network interface card.As shown in Figure 4, Wireless LAN module is an external module as terminal, links to each other with portable terminals such as notebook or PDA by external interfaces such as USB, PCMCIA 601.Because the built-in wireless network module 301 shown in the wireless network module of Fig. 4 and Fig. 3 is roughly the same, so omit its detailed description.
Fig. 5 shows the figure of an example of the message format of PCTS of the present invention; Fig. 6 shows the figure of an example of the message format of FCTS of the present invention.
As shown in Figure 5, in PCTS, comprise (Receiver Address) territory 504, recipient address of 503,6 bytes in overtime (Timeout) territory of 502,2 bytes in SDMA control (SDMA control) territory of 501,1 byte in frame control (Frame Control) territory of 2 bytes and the FCS territory 505 of 4 bytes, wherein, can be the 1002.11CTS territory of standard except that SDMA control domain 502.
As shown in Figure 6, in FCTS, comprise (Receiver Address) territory 604, recipient address of 603,6 bytes in duration (duration) territory of 602,2 bytes in SDMA control (SDMA control) territory of 601,1 byte in frame control (Frame Control) territory of 2 bytes and the FCS territory 605 of 4 bytes, wherein, can be 1002.11 CTS territories of standard except that SDMA control domain 602.
Frame control domain 501,601 is used to indicate the type of frame and relevant controlled flag position.
SDMA control domain 502,602 comprises 1 byte, and wherein, high 4 (type 506,606) is used to indicate this control frame is PCTS or FCTS, and low 4 (507,607) are used to the portable terminal of naming.
Duration (duration) territory among overtime territory 503 and the corresponding RTS, i.e. parameter " T as described later
Timeout" identical.
Recipient's address field 504,604 is the mac-layer address of the portable terminal of the corresponding RTS of transmission.
FCS territory 505,605 is used to carry out verification.
As shown in Figure 5 and Figure 6, can distinguish FCTS and PCTS by type (the being high 4) territory of SDMA control domain 502,602.
Fig. 7 shows M
RandomBe 4 and T
TimeoutThe figure of mac-layer protocol flow process of the present invention example when longer; Fig. 8 shows M
RandomBe 4 and T
TimeoutThe figure of another example of mac-layer protocol flow process more of the present invention.Wherein, so-called " M
Random" be meant the maximum numbers that insert request at random that allowing between access periods at random.If all insert request at random and all are accepted, then M
RandomThe number of users of uplink when equaling during the transfer of data (promptly along the transmission of the direction from the portable terminal to the access point apparatus).So-called " T
Timeout" be meant that at random the longest between access periods may the time.
As shown in Figure 7, at first, terminal 1 sends RTS 21 to AP 100, when AP 100 receives RTS21, as replying, gives terminal with the advisory of receiving the RTS frame to each terminal broadcast transmission (perhaps to terminal 1 point-to-point transmission) PCTS 31.Then, terminal 2 sends RTS 22 to AP 100, when AP 100 receives RTS 22, sends PCTS 32 to terminal.When right, terminal 3 sends RTS 23 to AP 100, when AP 100 receives RTS 23, sends PCTS 33 to terminal.At last, terminal 4 sends RTS 24 to AP 100, when AP 100 receives RTS 24, sends FCTS 34 to terminal, and the notice terminal has been received last RTS.After this, according to PCTS and FCTS, terminal 1,2,4 is carried out the transfer of data 25,26,27 of up direction respectively.When transfer of data 25,26,27 finished, access point apparatus 100 was represented the reply data control frame (ACK) of DTD to each terminal broadcast transmission.
As Fig. 7, shown in Figure 8, in whole process, at random between access periods 41 and transfer of data during 42 hocket during these two.At random between access periods 41, allow between terminal 1-4 and AP 100, to carry out the mutual of a plurality of RTS and CTS, thereby allow a plurality of user terminals to carry out channel competition.During transfer of data 42, parallel transmission and two parts of broadcasting reply data control frame (ACK) that can also be divided into the data of up direction, by between terminal 1-4 and AP 100, carrying out the mutual of RTS and CTS, can realize the estimation and the Frequency Synchronization of channel.
For terminal 1-4,, then need send the RTS frames to AP 100 according to the regulation of 1002.11 DCF flow processs of WLAN standard if want to send upstream data.In this process; comprise Fig. 7, SIFS (Short Interframe Space shown in Figure 8; short interFrameGap) time, DIFS (Distributed Interframe Space; distributed inter-frame space) dormancy time and selection back-off (retreating) time at random; be used to protect RTS/CTS mutual; even otherwise other-end is thought competitive channel, also can after this section RTS/CTS is mutual, keep silent.In addition, need data quantity transmitted information to be placed among the RTS.Owing to during the transfer of data definite duration is arranged, need the branch frame of terminal self according to transmission duration and transmission rate scheduling upper layer data bag.
When AP 100 received the RTS 21-24 of self terminal 1-4, AP100 obtained the channel condition information (CSI) of relevant terminal from received RTS21-24.At this moment, AP 100 judges that according to pre-defined rule the CTS that reply is PCTS or FCTS according to channel condition information.
Above-mentioned pre-defined rule can be set as required, below illustrates this pre-defined rule.
For example, if receiving the number of RTS frame, AP 100 is not more than M
RandomAnd T
TimeoutDo not have expiredly, then AP 100 replys PTCS to terminal.When terminal 1-4 receives PCTS frame from AP 100, can from PCTS, obtain training sequence as one of Consideration of transfer of data, carry out the Frequency Synchronization with AP100 simultaneously, terminal needs to wait for afterwards.
If the quantity of the RTS that AP 100 has received is greater than M
RandomThe RTS number of defined or send out first PCTS from AP 100 and begin T
TimeoutExpire, then AP 100 will send FCTS.Before sending FCTS, AP 100 can according to pre-defined algorithm, determine which terminal can send upstream data and this terminal transmission transmission rate of uplink data during ensuing transfer of data according to channel condition information (CSI).Send among the FCTS of all terminals at AP100, preserve the information which terminal of expression can be carried out the transmission rate of uplink and each terminal.
Above-mentioned pre-defined algorithm can be set as required, below illustrates this pre-defined algorithm.
For example, fairization that can consider transmission rate maximization and terminal room designs this pre-defined algorithm.
For example, also can there be four terminals need carry out up competition at random between access periods, in the RTS that each terminal sent, comprising the data volume that this terminal of expression need send during ensuing transfer of data.For example, the data rate of terminal 1 and terminal 2 is lower, the data rate of terminal 3 and terminal 4 is than higher, during this time, suppose that up-link capacity during the next transfer of data can't support terminal 3 and the transfer of data of terminal data 4, also can't support terminal 1, terminal 2 and the high terminal of data speed are carried out uplink simultaneously, but the data of transmission terminal 1 and terminal 2 can't make full use of channel capacity again simultaneously, then AP 100 is when dispatching, consider the principle of fairness and channel optimum, can select terminal 2 and terminal 3 to carry out the transfer of data of up direction, as the strategy of transfer of data.
Certainly, other factors also can be taken into account.Such as closer if the position of AP 100 judgement terminals 1 and terminal 2 and channel all are separated by, the very possible generation mutually when carrying out uplink disturbed, and can avoid terminal 1 and terminal 2 to transmit this time by scheduling.In addition, can consider complicated more scheduling here.For example, by striding the feedback of layer, we can know that it is to the more sensitive speech data of retardation ratio that terminal 1 needs the data of transmission.And the data of terminal 2 are insensitive to postponing, and the optimum words of the service statistics of AP consideration at this moment can arrange terminal 2 to carry out the transfer of data of up direction during next transfer of data, as the strategy of transfer of data.
Fig. 9 shows the workflow diagram of the end side in the wireless communication system of the present invention.
As shown in Figure 9, when terminal detects current channel and is in idle condition (step 901), judge whether this channel can apply for (step 902).
If judged result is not for applying for (being "No" in step 902), then terminal continues monitor channel, and the value of NAV is set.If judged result is for applying for (being "Yes") in step 902, then terminal sends RTS (step 903) to AP.Afterwards, enter the channel-monitoring state and wait for FCTS and PCTS (step 905).
If terminal is not received any CTS (being "No" in step 905), then continue to send RTS (returning step 903) according to channel status.If terminal receives CTS (being "Yes") in step 905, then be configured (step 906) according to PCTS.Then, judge that the CTS that receives is PCTS or FCTS (step 907).
If in step S907, judge it is the PCTS frame, then return step 905, terminal continues to wait for the CTS frame.If judge it is the FCTS frame in step S907, then terminal is taken out the content in the FCTS frame, and the result who dispatches according to the relevant AP that preserves in the FCTS frame judges whether that allowing to send packet carries out transfer of data (step 908).When step 908 is a "Yes", promptly send packet (step 909).When step 908 is a "No", continue to wait for (step 904).
After during entering transfer of data, AP sends broadcasting reply data control frame (ACK) (step 910), returns step 901, and terminal can continue to enter initial Channel Detection state.
Figure 10 shows the workflow diagram of AP device side in the wireless communication system of the present invention.
As shown in figure 10, at first, AP sets two key parameters, that is, and and M
RandomAnd T
Timeou(step 1001).When AP receives the RTS frame (in step 1002 for " receiving RTS ") of self terminal, AP obtains the parameters (step 1005) such as CSI of corresponding terminal (promptly sending the terminal of RTS) from the RTS that receives.
Then, AP determines reply PCTS or FCTS according to pre-defined rule.For example, if receiving the number of RTS frame, AP is not more than M
Random(being "Yes" in the step 1006) and T
TimeoutDo not have expiredly, then reply PTCS (step 1003).
When terminal received the PCTS frame, terminal was obtained training sequence as one of Consideration of transfer of data from the PCTS that receives, and carried out the Frequency Synchronization with AP simultaneously, and terminal continues to wait for afterwards.
If AP has received M
RandomThe RTS number of defined (in the step 1006 for "No") or begin T from sending first PCTS
TimeoutExpire, then can dispatch decision transmission terminal and speed (step S1007), send FCTS (step 1008) according to the situation of CSI.Receive all come self terminal data (step 1009) afterwards, send the reply data control frame (step 1010) of expression DTD to terminal.
If T
TimeoutWhen expired, AP does not also receive any RTS (step 1004 is a "No"), and then AP can get back to initial condition and not send out FCTS.
More than, the specific embodiment of the present invention has been described, but has the invention is not restricted to this.For example, the present invention can also adopt OFDM (OFDMA) and/or space division multiple access (SDMA) to communicate with portable terminal.
In this MIMO-OFDMA technology,, then can greatly improve transmission rate if use SDMA (Space Division MultipleAccess, space division multiple access inserts).
In addition, comprise access point apparatus (Access Point, AP) and adopt this SDMA technology in the wireless communication system of portable terminal, also have the following advantages: (1) can allow a plurality of portable terminals to transmit data simultaneously; (2) can avoid competing and reducing the quantity of interframe redundancy, reduce the burden of agreements such as MAC (Mediumaccess control, medium access control) layer and physical layer protocol, only improve the inaccessiable effect of transmission rate simply thereby reach; (3) because of the ability that is subjected to portable terminal and the restriction in space, the number of antennas of portable terminal is generally less than the number of antennas of access point apparatus, if this SDMA technology of employing, then can improve the degree of freedom of the data dispatch of channel well.
Claims (15)
1. the access point apparatus in the wireless communication system of a multiple-input and multiple-output, this wireless communication system also comprises portable terminal, this access point apparatus comprises:
Physical layer block communicates with described portable terminal;
Antenna part has a plurality of antennas;
Request transmission control frame receiver module, via described physical layer block, reception is from the request transmission control frame of described portable terminal, and it is the time slot of the transfer of data of up direction that this request transmission control frame is used to ask the direction from described portable terminal to described access point apparatus;
Reply the transmission control frame sending module, via described physical layer block, to reply transmission control frame and send to described portable terminal, described reply transmission control frame comprise the described request transmission control frame that described request transmission control frame receiver module is received reply and represent temporarily not begin to carry out described up direction the transmission data temporarily reply transmission control frame, and expression begin to carry out described up direction the transmission data finally reply transmission control frame;
Reply data control frame sending module, when the transmission ED of described up direction, the reply data control frame with the transmission ED of the described up direction of expression sends to described portable terminal via described physical layer block; And
Scheduler module is dispatched the transfer of data of described up direction.
2. access point apparatus as claimed in claim 1, wherein,
Described request transmission control frame receiver module obtains the channel condition information of described portable terminal from the described request transmission control frame that receives, and sends to described scheduler module;
Described scheduler module is according to described channel condition information, and decision is to the described transmission control frame of replying of described portable terminal transmission.
3. access point apparatus as claimed in claim 1 or 2, wherein,
After receiving the described request transmission control frame of all portable terminals, or after finishing between access periods at random, described scheduler module is dispatched, so that from all portable terminals that sent the described request transmission control frame, carry out the portable terminal of the transfer of data of described up direction in selecting during next transfer of data, and respectively the selected portable terminal that goes out is distributed antenna and transmission rate.
4. access point apparatus as claimed in claim 3, wherein,
By the described transmission control frame sending module of replying, with the result that described scheduler module is carried out described scheduling, be kept in the described final transmission control frame, and issue described portable terminal.
5. access point apparatus as claimed in claim 1 or 2, wherein,
Described scheduler module also comprises the control strategy module, and this control strategy module is used for the strategy of the transfer of data of the described up direction of definite control under the situation of multiple-input and multiple-output.
6. access point apparatus as claimed in claim 1 or 2, wherein,
Adopt OFDM and/or space division multiple access and portable terminal to communicate.
7. access point apparatus as claimed in claim 1 or 2, wherein,
The quantity of described portable terminal is less than or equal to the quantity of described antenna.
8. the portable terminal in the wireless communication system of a multiple-input and multiple-output, this wireless communication system also comprises access point apparatus, this portable terminal comprises:
Physical layer block communicates with described access point apparatus;
Antenna part has antenna;
Request transmission control frame sending module, via described physical layer block, send the request transmission control frame to described access point apparatus, it is the time slot of the transfer of data of up direction that this request transmission control frame is used to ask the direction from described portable terminal to described access point apparatus;
Reply the transmission control frame receiver module, via described physical layer block, reception is from the transmission control frame of replying of described access point apparatus, described reply transmission control frame comprise described access point apparatus the described request transmission control frame is replied and represent temporarily not begin to carry out described up direction the transmission data temporarily reply transmission control frame, and expression begin to carry out described up direction the transmission data finally reply transmission control frame; And
Reply data control frame receiver module, reception is from the reply data control frame of the transmission ED of the described up direction of expression of described access point apparatus.
9. the portable terminal in the wireless communication system as claimed in claim 8, wherein,
The described transmission control frame receiver module of replying carries out the transfer of data of described up direction or waits for that the next one is at random between access periods according to the described final transmission control frame that receives.
10. the wireless communication system of a multiple-input and multiple-output comprises access point apparatus and portable terminal, wherein,
Described access point apparatus comprises:
Physical layer block communicates with described portable terminal;
Antenna part has a plurality of antennas;
Request transmission control frame receiver module, via described physical layer block, reception is from the request transmission control frame of described portable terminal, and it is the time slot of the transfer of data of up direction that this request transmission control frame is used to ask the direction from described portable terminal to described access point apparatus;
Reply the transmission control frame sending module, via described physical layer block, to reply transmission control frame and send to described portable terminal, described reply transmission control frame comprise the described request transmission control frame that described request transmission control frame receiver module is received reply and represent temporarily not begin to carry out described up direction the transmission data temporarily reply transmission control frame, and expression begin to carry out described up direction the transmission data finally reply transmission control frame;
Reply data control frame sending module, when the transmission ED of described up direction, the reply data control frame with the transmission ED of the described up direction of expression sends to described portable terminal; And
Scheduler module is dispatched the transfer of data of described up direction.
Described portable terminal comprises:
Physical layer block communicates with described access point apparatus;
Antenna part has antenna;
Request transmission control frame sending module, via described physical layer block, send the request transmission control frame to described access point apparatus, it is the time slot of the transfer of data of up direction that this request transmission control frame is used to ask the direction from described portable terminal to described access point apparatus;
Reply the transmission control frame receiver module, via described physical layer block, reception is from the transmission control frame of replying of described access point apparatus, described reply transmission control frame comprise described access point apparatus the described request transmission control frame is replied and represent temporarily not begin to carry out described up direction the transmission data temporarily reply transmission control frame, and expression begin to carry out described up direction the transmission data finally reply transmission control frame; And
Reply data control frame receiver module, reception is from the reply data control frame of the transmission ED of the described up direction of expression of described access point apparatus.
11. the control method of the transfer of data of the up direction in the multiple input, multiple output wireless communication system, this multiple input, multiple output wireless communication system comprises access point apparatus and portable terminal, described up direction is the direction from described portable terminal to described access point apparatus, and the control method of the transfer of data of this up direction may further comprise the steps:
Steps A, described portable terminal will ask transmission control frame to send to described access point apparatus, and this request transmission control frame is used to ask the time slot of the transfer of data of described up direction;
Step B, described access point apparatus receives the described request transmission control frame, and to portable terminal send to the described request transmission control frame reply and represent temporarily not begin to carry out described up direction the transmission data temporarily reply transmission control frame;
Step C, described access point apparatus obtain the channel condition information of described portable terminal from the described request transmission control frame;
Step D, after receiving the described request transmission control frame of all portable terminals, or after finishing between access periods at random, described access point apparatus is dispatched, so that from all portable terminals that sent the described request transmission control frame, carry out the portable terminal of the transfer of data of described up direction in selecting during next transfer of data, and respectively the selected portable terminal that goes out is distributed antenna and transmission rate;
Step e, described access point apparatus is kept at finally the replying in the transmission control frame of transmission data that expression begins to carry out described up direction with the result of described scheduling, and the described transmission control frame of finally replying is issued described portable terminal;
Step F, described portable terminal receive described finally reply transmission control frame after, the portable terminal during selected pool goes out is finally replied the transfer of data that transmission control frame carries out up direction according to described.
12. the control method of transfer of data as claimed in claim 11, wherein,
Described steps A, is only carried out the described request transmission control frame at random, is describedly temporarily replied control frame and described transmitting-receiving of finally replying control frame at this at random between access periods to step e between access periods.
13. as the control method of claim 11 or 12 described transfer of data, wherein,
During described step F is transfer of data, only during this transfer of data, carry out the transfer of data of up direction.
14. the control method of transfer of data as claimed in claim 11, wherein,
Adopt OFDM and/or space division multiple access to communicate.
15. the network interface card in the wireless communication system of a multiple-input and multiple-output, this wireless communication system also comprises access point apparatus, and this network interface card comprises:
Physical layer block communicates with described access point apparatus;
Antenna part has antenna;
Request transmission control frame sending module, via described physical layer block, send the request transmission control frame to described access point apparatus, it is the time slot of the transfer of data of up direction that this request transmission control frame is used to ask the direction from described portable terminal to described access point apparatus;
Reply the transmission control frame receiver module, via described physical layer block, reception is from the transmission control frame of replying of described access point apparatus, described reply transmission control frame comprise described access point apparatus the described request transmission control frame is replied and represent temporarily not begin to carry out described up direction the transmission data temporarily reply transmission control frame, and expression begin to carry out described up direction the transmission data finally reply transmission control frame; And
Reply data control frame receiver module, reception is from the reply data control frame of the transmission ED of the described up direction of expression of described access point apparatus.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810144969A CN101656644A (en) | 2008-08-18 | 2008-08-18 | Access point device, mobile terminal, wireless communication system and control method of wireless communication system |
| JP2009186830A JP5601561B2 (en) | 2008-08-18 | 2009-08-11 | Access point, mobile terminal, radio communication system and control method thereof |
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| CN200810144969A CN101656644A (en) | 2008-08-18 | 2008-08-18 | Access point device, mobile terminal, wireless communication system and control method of wireless communication system |
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| CN101656644A true CN101656644A (en) | 2010-02-24 |
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| JP5601561B2 (en) | 2014-10-08 |
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