CN104079375A - Data acquiring and sending method and device for STA in wireless local area network - Google Patents
Data acquiring and sending method and device for STA in wireless local area network Download PDFInfo
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- CN104079375A CN104079375A CN201410028575.4A CN201410028575A CN104079375A CN 104079375 A CN104079375 A CN 104079375A CN 201410028575 A CN201410028575 A CN 201410028575A CN 104079375 A CN104079375 A CN 104079375A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The embodiment of the invention provides a channel competition method applied to a wireless local area network. The method comprises the steps that an STA sends PS-Poll, or Trigger or uplink data based on a competition mechanism and stops sending PS-Poll, or Trigger or uplink data not sent successfully yet when a time slot ends, the current competition mechanism state is frozen till competition is continued based on the frozen competition mechanism in the current competition period or later competition period, and then the STA continues to send the PS-Poll, or Trigger or uplink data not sent successfully. Correspondingly, the embodiment of the invention provides a channel competition device. By the adoption of the technical scheme, a competition period is allowed to recover to the previous competition state quickly, and therefore energy consumption is reduced.
Description
Technical field
The present invention relates to communication technical field, relate in particular to method, device that STA in WLAN (wireless local area network) obtained and sent data.
Background technology
At WLAN(Wireless Local Area Networks, WLAN) in, because STA(Station, wireless site) be generally powered battery, energy constraint, according to the MAC(Medium Access Control of IEEE802.11 definition, media are got involved and are controlled) layer standard, AP(Access Point, access point) according to BI(Beacon Interval, beacon interval) periodic broadcast Beacon(beacon), be operated in the STA periodic wakeup under battery saving mode and receive beacon, wherein, beacon is for notifying a kind of management frames of some customizing messages of STA, in beacon, include data structure TIM(Traffic Indication Map, transmission indication mapping), be used for notifying STA whether to be cached with its Frame at AP, TIM itself is the virtual bit mapping table forming by 2008, and the meeting of each in TIM corresponds to specific STA, and the state of each represents whether AP is cached with the data of this corresponding STA.
In 802.11ah application scenarios, comprise the intelligent meter reading scene that support can reach at most 6000 STA at present, after a large amount of STA wake up, need to send PS-Poll(power saving-poll) frame obtains downlink data, PS-Poll is a kind of control frame that STA sends, for obtain the data of this AP buffer memory from AP; And the competition that a large amount of PS-Poll cause can cause having the STA that low energy consumption requires to produce extra energy consumption.In addition, because Offloading STA in network and Sensor STA coexist, and Sensor STA is due to reasons such as transmitting power are little, likely become the hidden node of Offloading STA, the Sensor STA that so just causes having low energy consumption requirement more easily and Offloading STA bump, thereby repeatedly retransmit and produce extra energy consumption.
For overcoming the above problems, prior art has proposed timeslot-based competing method, this method synthesis the access and the CSMA/CA that based on time slot, divide, require the time slot of each STA under it to start competitive channel.In addition, also competition transmission PS-Poll and the difference of AP transmission downlink data are come, be divided in respectively the assigned timeslot competition PS-Poll of different period: STA in a specific time period, AP is in another period after this specific time period, according to the order that receives PS-Poll, in assigned timeslot, send data.Like this PS-Poll broken up and send respectively and can reduce the probability that PS-Poll conflicts with downlink data, and the STA that can make successfully to compete channel proceeds to sleep until AP wakes up will send to his downlink data time, has reduced like this energy consumption of waiting for again.
Although prior art scheme provides the PS-Poll breaing up competing method, but, when STA can not be within the time period of dividing during successful downlink data receiving, lack corresponding treatment mechanism, in addition, at the upstream data of dividing based on time slot, send when unsuccessful the problem that existing algorithm also cannot handle packet retransmits.Therefore, when PS-Poll loses or make mistakes, the acknowledgement frame ACK of PS-Poll loses or make mistakes or when DATA that AP sends loses or makes mistakes, STA cannot correctly obtain downlink data or send upstream data.
Summary of the invention
Method, device that the embodiment of the present invention provides STA in a kind of WLAN (wireless local area network) to obtain and send data so that the STA in WLAN (wireless local area network), can be enough more in time, obtain more accurately/send data, reduce data loss rate.
The embodiment of the present invention provides site STA in a kind of WLAN (wireless local area network) to obtain the method for data, for STA, from the access point AP of its access, obtains data, comprising:
STA is according to the beacon receiving, know that described AP has after the downlink data of described STA, according to the transmission indication mapping TIM comprising in described beacon, in the reserved time slot in current beacon interval, send the upstream data DATA that PS-Poll, Trigger or described STA send and receive described AP and receiving the downlink data returning after the upstream data DATA that described PS-Poll, Trigger or described STA send; When if described STA can not successfully receive described downlink data in described reserved time slot, described STA, after described reserved time slot, sends the upstream data DATA of PS-Poll, Trigger or described STA transmission again to obtain described downlink data.
The embodiment of the present invention also provides a kind of data acquisition facility, for the access point AP from WLAN (wireless local area network), obtains data, and this device comprises:
The first Transmit-Receive Unit, for according to receive from described AP beacon, know that described AP has after the downlink data of described STA, according to the transmission indication mapping TIM comprising in described beacon, in reserved time slot in current beacon interval, send the upstream data DATA that PS-Poll, Trigger or described STA send and receive described AP and receiving the downlink data returning after the upstream data DATA that described PS-Poll, Trigger or described STA send, described reserved time slot is that a period of time in beacon interval is interval; The second Transmit-Receive Unit, for when described the first Transmit-Receive Unit can not successfully receive described downlink data in described reserved time slot, after described reserved time slot, again send the upstream data DATA of PS-Poll, Trigger or described STA transmission to obtain described downlink data.
The embodiment of the present invention provides site STA in a kind of WLAN (wireless local area network) to obtain the method for data, for STA, from the access point AP of its access, obtains data, comprising:
STA receives the beacon that AP sends, and the corresponding time slot in the indicated reserved time slot of described beacon sends upstream data bag; When this STA can not the assigned timeslot in described reserved time slot successfully sends described upstream data bag, if the number of retransmissions of this packet does not also arrive maximum retransmission, this STA, after described reserved time slot, sends this upstream data bag again.
The embodiment of the present invention is by above technical scheme, during for timeslot-based CSMA/CA channel access, cannot process the situation of unsuccessful reception/transmission data, provide a kind of new mechanism allow STA again competitive channel to obtain downlink information or to send uplink information, as STA, know have its downlink data or STA to be allowed to send upstream data, but when correctly not obtaining the downlink data of self in the time slot of appointment in the current period or sending upstream data, after this period, reselect another time slot and again send PS-Poll, the upstream data DATA that Trigger or described STA send obtains data or again sends upstream data, thereby make to work as PS-Poll, the upstream data DATA that Trigger or described STA send loses or makes mistakes, PS-Poll, the ACK of the upstream data DATA that Trigger or described STA send loses or makes mistakes, the DATA that AP sends loses or makes mistakes, or when the ACK of upstream data bag loses, STA still can correctly obtain or send data, improved the reliability of transfer of data between STA and AP.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The network topological diagram of the network system that Fig. 1 provides for the embodiment of the present invention;
In the WLAN (wireless local area network) that Fig. 2 provides for the embodiment of the present invention, STA obtains the method flow diagram of data;
In the WLAN (wireless local area network) that Fig. 3 provides for the embodiment of the present invention, STA obtains the method schematic diagram of data;
In the WLAN (wireless local area network) that Fig. 4 provides for the embodiment of the present invention, STA obtains the method schematic diagram of data;
In the WLAN (wireless local area network) that Fig. 5 provides for the embodiment of the present invention, STA obtains the method schematic diagram of data;
The subscriber equipment exemplary plot that Fig. 6 provides for the embodiment of the present invention;
The data acquisition facility exemplary plot that Fig. 7 provides for the embodiment of the present invention;
In the WLAN (wireless local area network) that Fig. 8 provides for the embodiment of the present invention, STA sends the method flow diagram of data;
In the WLAN (wireless local area network) that Fig. 9 provides for the embodiment of the present invention, STA sends the method schematic diagram of data;
In the WLAN (wireless local area network) that Figure 10 provides for the embodiment of the present invention, STA sends the method schematic diagram of data.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
The method that the embodiment of the present invention one provides STA in a kind of WLAN (wireless local area network) to obtain data, obtains data for the STA of WLAN (wireless local area network) from the AP of its access.Figure 1 shows that the typical network topology structure chart of application technical solution of the present invention, according to Fig. 1, WLAN (wireless local area network) 100 comprises: access point (AP, Access Point) 120, and by the website (STA of access point 120 access networks, Station) 110-115, the STA110-115 being associated with under same AP120 forms a Basic Service Set (BSS); WLAN (wireless local area network) 100 accesses backbone networks 140 by gateway 130, and then is connected to the server in network.
It should be noted that, STA in all embodiment of the present invention refers to the basic logic entity in WLAN (wireless local area network), STA is specifically as follows the terminal equipment that comprises wireless lan interfaces, as many mobile phones, panel computer etc. in the market, all support wireless lan interfaces, portable machine is built-in wireless lan interfaces also.For some, itself do not possess the equipment of wireless lan interfaces, can for it, provide wireless lan interfaces by the mode of WLAN wireless network card is installed.
Also it should be noted that, in all embodiment of the present invention, " reserved time slot " is defined as the time interval for obtaining after beacon interval is segmented, and as the RAW in Fig. 3 is a reserved time slot, RAW1 and RAW2 are parts of this reserved time slot RAW; Further, one " reserved time slot " can be subdivided into less time interval again, is referred to as " time slot ", and in embodiments of the present invention, time slot is the minimum time unit for the frame that transmits and receive data, control frame or management frames.Meanwhile, it will be appreciated by persons skilled in the art that a beacon interval can be divided into two or more reserved time slot, and each reserved time slot can be subdivided into a plurality of less time slots.
Figure 2 shows that STA in the WLAN (wireless local area network) that the embodiment of the present invention provides obtains the method flow diagram of data, according to Fig. 2, the method comprises:
Step 201, STA is according to the beacon receiving, know that AP has after its downlink data, according to the TIM comprising in described beacon, in reserved time slot in current beacon interval, send PS-Poll, Trigger(trigger frame) or the upstream data DATA that sends of described STA, (the upstream data DATA that PS-Poll, Trigger or described STA send can be called indicate frame) also receives described AP and receiving the downlink data returning after described sign frame.
Particularly, as shown in Figure 3, in one embodiment, the idiographic flow of implementation step 201 is as follows: after AP sends Beacon, in current beacon interval, reserved part period (as the reserved time slot RAW1 in Fig. 3) for STA send PS-Poll, Trigger or as described in the upstream data DATA of STA transmission; After RAW1, reserved part period (as the reserved time slot RAW2 in Fig. 3) sends downlink data to STA for AP; In the TIM only comprising at current Beacon, being designated 1 STA allows in RAW1 the first time slot of appointment to send the upstream data DATA that PS-Poll, Trigger or described STA send, the STA that success sends the upstream data DATA that PS-Poll, Trigger or described STA send can proceed to sleep state, and in RAW2 corresponding the second time slot downlink data receiving of waking up; Receive after PS-Poll, the Trigger of STA or the upstream data DATA of described STA transmission, AP arranges the transmission of downlink data in RAW2, wherein, according to definition before, the first time slot and the second time slot are special time interval in reserved time slot, and the length of the first time slot and the second time slot can define according to the actual requirements flexibly; For example, in a preferred embodiment of the present invention, the length of the first time slot can be TS1=PS-Poll+SIFS+ACK, and the second slot length can be TS2=DATA+SIFS+ACK.
In the step 201 of the embodiment of the present invention, the corresponding time slot in two different reserved time slots removes respectively to send upstream data DATA and the downlink data receiving of PS-Poll, Trigger or described STA transmission; It will be appreciated by persons skilled in the art that two different time-gaps that also can adopt in is set aside some time remove to send upstream data DATA and the downlink data receiving of PS-Poll, Trigger or described STA transmission.
Step 202, when if described STA can not successfully receive described downlink data in described reserved time slot, described STA, after described reserved time slot, sends the upstream data DATA of PS-Poll, Trigger or described STA transmission again to obtain described downlink data.
Particularly, as shown in Figure 4, in one embodiment, within the reserved period (being the RAW in Fig. 4), if the PS-Poll that STA sends, the upstream data DATA that Trigger or described STA send loses or makes mistakes (as shown in Figure 4 (a)), or PS-Poll, the ACK of the upstream data DATA that Trigger or described STA send loses or makes mistakes (as shown in Figure 4 (b)), or the DATA that AP sends loses or makes mistakes (as shown in Figure 4 (c)), capital causes this STA in the assigned timeslot in reserved time slot RAW, successfully not receive data, at this time, if the PS-Poll number of retransmissions (parameter that can set of this STA, be generally 7 times) also do not arrive maximum retransmission, this STA is in current Beacon interval, another reserved time slot after reserved time slot RAW, select corresponding time slot again to send PS-Poll, the upstream data DATA that Trigger or described STA send obtains downlink data.The reserved time slot of wherein dividing in Beacon Interval can be called as RAW(restriction access window, restricted access window), but be not limited to this title.
Further, as a kind of embodiment, STA can not successfully receive after data in the assigned timeslot in reserved time slot RAW, this STA is in current Beacon interval, another reserved time slot after reserved time slot RAW, the upstream data DATA that selects corresponding time slot again to send PS-Poll, Trigger or described STA transmission obtains downlink data.In this concrete enforcement, whether the PS-Poll number of retransmissions that can not pay close attention to STA reaches maximum retransmission.
In the present embodiment, successfully to receive the reason of data in can not the assigned timeslot in reserved time slot RAW a kind of may be that STA sends the upstream data DATA failure that PS-Poll, Trigger or described STA send and causes correctly obtaining data in reserved time slot to STA.The ACK time of reception of the upstream data DATA that the transmitting time of the upstream data DATA for example sending due to PS-Poll, Trigger or described STA or PS-Poll, Trigger or described STA send must not surmount sets transmission that the border of time slot causes unsuccessfully.Or the number of retransmissions of the upstream data DATA that for example PS-Poll, Trigger or described STA send arrives the failure of presetting number of retransmissions and causing.The reason another kind that STA successfully receives data in can not the assigned timeslot in reserved time slot RAW may be that AP sends downlink data failure, for example, data are correct reception not, the ACK that STA sends is correct reception not, or cannot resend data or ACK owing to arriving time slot limited boundary.
Correspondingly, AP at least retains the data that will send to this STA before current Beacon Interval finishes.
In another embodiment of the present invention, as shown in Figure 5, in reserved time slot RAW, the PS-Poll sending as STA, the upstream data DATA that Trigger or described STA send loses or make mistakes (as shown in Fig. 5 (a)), or PS-Poll, the ACK of the upstream data DATA that Trigger or described STA send loses or make mistakes (as shown in Fig. 5 (b)), or when the DATA that AP sends loses or makes mistakes (as shown in Fig. 5 (c)), STA cannot the corresponding time slot in RAW successfully receive data, at this time, if the PS-Poll number of retransmissions of this STA does not also arrive maximum retransmission, in this STA another Beacon interval after current Beacon interval, select a reserved time slot, and the corresponding time slot in this reserved time slot sends PS-Poll again, the upstream data DATA that Trigger or described STA send obtains downlink data, that is to say, in the present embodiment, do not limit STA and can only within current Beacon Interval, retransmit PS-Poll, the upstream data DATA that Trigger or described STA send obtains downlink data, but other Beacon Interval further expanding to after current Beacon Interval retransmits PS-Poll, the upstream data DATA that Trigger or described STA send.
Further, at another execution mode STA, cannot the corresponding time slot in RAW successfully receive after data, in this STA another Beacon interval after current Beacon interval, select a reserved time slot, and the corresponding time slot in this reserved time slot again sends the upstream data DATA that PS-Poll, Trigger or described STA send and obtains downlink data.
Correspondingly, AP should retain will send to the data of this STA until STA correctly receives this packet, or data re-transmitting number of times reached maximum retransmission, or this packet is overtime is dropped.
In implementation process of the present invention, STA is based on DCF(distributed coordination function distributed coordination function) or EDCA(Enhanced Distributed Channel Access, improved distributed channel access) mechanism competition sends PS-Poll, the upstream data DATA that Trigger or described STA send, when time slot finishes, STA stops retransmitting the PS-Poll that not yet success sends, the upstream data DATA that Trigger or described STA send, corresponding DCF or EDCA state are frozen, until the DCF based on current or EDCA state continuation competition again in the competition period in current BI or follow-up BI, continue the PS-Poll of transmission not yet sent successfully, the upstream data DATA that Trigger or described STA send, also can resend the PS-Poll of transmission, the upstream data DATA that Trigger or described STA send will soon need the PS-Poll of the transmission of transmission, the upstream data DATA that Trigger or described STA send sends once again again.Or, STA calculates according to slot length maximum number of retransmissions that current time slots allows, when maximum number of retransmissions that number of retransmissions is greater than that current time slots allows, stop retransmitting, corresponding DCF or EDCA state are frozen, until the DCF based on current or EDCA state continuation competition again in the competition period in current BI or follow-up BI.Also having a kind of mode can be that STA calculates according to slot length maximum number of retransmissions that current time slots allows, and be set to current maximum retransmission, when the number of retransmissions in current time slots reaches maximum retransmission, stop retransmitting, and STA again DCF state during competitive channel with stop retransmitting before DCF state irrelevant.
The embodiment of the present invention is by above technical scheme, during for timeslot-based CSMA/CA channel access, cannot process the situation of unsuccessful reception/transmission data, provide a kind of new mechanism allow STA again competitive channel to obtain downlink information, as STA, know there is its downlink data, but while correctly not obtaining the downlink data of self in the time slot of appointment in the current period, after this period, reselect another time slot and again send PS-Poll, the upstream data DATA that Trigger or described STA send obtains data, thereby make to work as PS-Poll, the upstream data DATA that Trigger or described STA send loses or makes mistakes, PS-Poll, the ACK of the upstream data DATA that Trigger or described STA send loses or makes mistakes or when DATA that AP sends loses or makes mistakes, STA still can correctly obtain data, improved the reliability of transfer of data between STA and AP.
Embodiment bis-, and the embodiment of the present invention further provides the device embodiment that realizes each step and method in said method embodiment.The embodiment of the present invention can be applicable in various communication systems, especially can be adapted in network system as shown in Figure 1, and can be for example a subscriber equipment or STA.Fig. 6 shows a kind of structure chart of subscriber equipment, and according to Fig. 6, subscriber equipment 10 comprises: processing unit 101, memory 102 and antenna 103.Processing unit 101 is controlled the operation of subscriber equipment 10, and processing unit 101 can also be called CPU.Memory 102 can comprise read-only memory and random access memory, for providing instruction and data to processing unit 101.A part for memory 102 can also comprise non-volatile row random access memory (NVRAM).In concrete application, subscriber equipment 10 can embed or itself can be exactly the Wireless Telecom Equipment of WAP (wireless access point), WiFI focus or wireless router and so on for example.Each assembly of subscriber equipment 10 is coupled by bus system 100, and wherein bus system, except comprising data/address bus, also comprises power bus, control bus and status signal bus in addition.But for the purpose of clearly demonstrating, in the drawings various buses are all designated as to bus system 100..
The method that the STA that the embodiment of the present invention discloses obtains data can be applied to, in subscriber equipment 10 that the present embodiment provides, be realized in other words by subscriber equipment 10.In implementation procedure, each step of said method can complete by the integrated logic circuit of hardware or the instruction of form of software of subscriber equipment 10.These instructions can be realized and control to coordinate by the processing unit 101 of subscriber equipment 10.The method disclosing for carrying out the embodiment of the present invention one, processing unit 101 can be general processor, digital signal processor (DSP), application-specific integrated circuit (ASIC) (ASIC), ready-made programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic device, discrete hardware components.
Particularly, in the subscriber equipment 10 that the embodiment of the present invention two provides, the beacon that antenna 103 sends for the AP receiving with subscriber equipment 10 communication connection, wherein, beacon is that AP is for notifying a kind of management frames of some customizing messages of STA, and the time interval between two adjacent beacons that AP sends is BI(Beacon Interval, beacon slot);
Processing unit 101, be used at the beacon receiving according to antenna 103, know that described AP has after the downlink data of subscriber equipment 10, according to the transmission indication mapping TIM comprising in described beacon, in the reserved time slot in current beacon interval, send the upstream data DATA that PS-Poll, Trigger or described STA send and receive described AP and receiving the downlink data returning after the upstream data DATA that described PS-Poll, Trigger or described STA send.
Further, processing unit 101 also for, in the time can not successfully receiving described downlink data in described reserved time slot, after described reserved time slot, again send the upstream data DATA of PS-Poll, Trigger or described STA transmission to obtain described downlink data.
Particularly, as shown in Figure 4, in one embodiment, within the reserved period (being the RAW in Fig. 4), if the PS-Poll that subscriber equipment 10 sends, the upstream data DATA that Trigger or described STA send loses or makes mistakes (as shown in Figure 4 (a)), or PS-Poll, the ACK of the upstream data DATA that Trigger or described STA send loses or makes mistakes (as shown in Figure 4 (b)), or the DATA that AP sends loses or makes mistakes (as shown in Figure 4 (c)), capital causes subscriber equipment 10 in the assigned timeslot in reserved time slot RAW, successfully not receive data, at this time, if the PS-Poll number of retransmissions of subscriber equipment 10 does not also arrive maximum retransmission, processing unit 101 is in current Beacon interval, another reserved time slot after reserved time slot RAW, select corresponding time slot again to send PS-Poll, the upstream data DATA that Trigger or described STA send obtains downlink data.The reserved time slot of wherein dividing in Beacon Interval can be called as RAW(restriction access window, restricted access window), but be not limited to this title.
Correspondingly, AP at least retains the data that will send to subscriber equipment 10 before current Beacon Interval finishes.
In another embodiment of the present invention, as shown in Figure 5, in reserved time slot RAW, the PS-Poll sending when subscriber equipment 10, the upstream data DATA that Trigger or described STA send loses or make mistakes (as shown in Fig. 5 (a)), or PS-Poll, the ACK of the upstream data DATA that Trigger or described STA send loses or make mistakes (as shown in Fig. 5 (b)), or when the DATA that AP sends loses or makes mistakes (as shown in Fig. 5 (c)), subscriber equipment 10 cannot the corresponding time slot in RAW successfully receive data, at this time, if the PS-Poll number of retransmissions of subscriber equipment 10 does not also arrive maximum retransmission, in processing unit 101 another Beacon interval after current Beacon interval, select a reserved time slot, and the corresponding time slot in this reserved time slot sends PS-Poll again, the upstream data DATA that Trigger or described STA send obtains downlink data, that is to say, in the present embodiment, only do not limit and retransmit PS-Poll within current Beacon Interval, the upstream data DATA that Trigger or described STA send obtains downlink data, but other Beacon Interval further expanding to after current Beacon Interval retransmits PS-Poll, the upstream data DATA that Trigger or described STA send.
Correspondingly, AP should retain will send to the data of subscriber equipment 10 until subscriber equipment 10 correctly receives this packet, or data re-transmitting number of times reached maximum retransmission, or this packet is overtime is dropped.
Memory 102 is for, data of obtaining for storage processing unit 101.
The embodiment of the present invention is by above technical scheme, provide process the STA of downlink data can not be within the time period of dividing the mechanism of successful downlink data receiving, as STA, know there is its downlink data, but while correctly not obtaining the downlink data of self in the time slot of appointment in the current period, after this period, reselect another time slot and again send PS-Poll, the upstream data DATA that Trigger or described STA send obtains data, thereby make to work as PS-Poll, the upstream data DATA that Trigger or described STA send loses or makes mistakes, PS-Poll, the ACK of the upstream data DATA that Trigger or described STA send loses or makes mistakes or when DATA that AP sends loses or makes mistakes, STA still can correctly obtain data, improved the reliability of transfer of data between STA and AP.
Embodiment tri-, and the embodiment of the present invention provides a kind of data acquisition facility, for the access point AP from WLAN (wireless local area network), obtain data, and as shown in Figure 7, this device comprises: the first Transmit-Receive Unit 710, the second Transmit-Receive Unit 720;
Wherein, the first Transmit-Receive Unit 710, the beacon receiving for basis, know that described AP has after its downlink data, according to the TIM comprising in described beacon, in the reserved time slot in current beacon interval, send the upstream data DATA that PS-Poll, Trigger or described STA send and receive described AP and receiving the downlink data returning after the upstream data DATA that described PS-Poll, Trigger or described STA send;
Particularly, after receiving Beacon, if in the TIM that current Beacon comprises, corresponding with this data acquisition facility 70 is designated 1, the first Transmit-Receive Unit 710 first time slot of appointment in reserved time slot sends the upstream data DATA of PS-Poll, Trigger or described STA transmission, success sends after the upstream data DATA of PS-Poll, Trigger or described STA transmission, data acquisition facility 70 can proceed to sleep state, and in this reserved time slot corresponding the second time slot downlink data receiving of waking up; Correspondingly, AP is after receiving PS-Poll, the Trigger of data acquisition facility 70 transmissions or the upstream data DATA of described STA transmission, in reserved time slot, arrange the transmission of downlink data, wherein, according to definition before, the first time slot and the second time slot are special time interval in reserved time slot, and the length of the first time slot and the second time slot can define according to the actual requirements flexibly; In a preferred embodiment of the present invention, the length of the first time slot can be TS1=PS-Poll+SIFS+ACK, and the second slot length can be TS2=DATA+SIFS+ACK.
In addition, in embodiments of the present invention, the corresponding time slot of the first Transmit-Receive Unit 710 in two different reserved time slots removes respectively to send upstream data DATA and the downlink data receiving of PS-Poll, Trigger or described STA transmission; It will be appreciated by persons skilled in the art that the first Transmit-Receive Unit 710 also can two different time-gaps in is set aside some time removes to send upstream data DATA and downlink data receiving that PS-Poll, Trigger or described STA send, repeats no more herein.
The second Transmit-Receive Unit 720, for when the first Transmit-Receive Unit 710 can not successfully receive described downlink data in described reserved time slot,, after described reserved time slot, again send the upstream data DATA of PS-Poll, Trigger or described STA transmission to obtain described downlink data.
In one embodiment, within the reserved period, if the PS-Poll that the first Transmit-Receive Unit 710 sends, the upstream data DATA that Trigger or described STA send loses or makes mistakes, or PS-Poll, the ACK of the upstream data DATA that Trigger or described STA send loses or makes mistakes, or the DATA that AP sends loses or makes mistakes, capital causes this STA in the assigned timeslot in this reserved time slot, successfully not receive data, at this time, if PS-Poll number of retransmissions does not also arrive maximum retransmission, the second Transmit-Receive Unit 720 is in current Beacon interval, another reserved time slot after this reserved time slot, select corresponding time slot again to send PS-Poll, the upstream data DATA/ that Trigger or described STA send obtains downlink data.The reserved time slot of wherein dividing in Beacon Interval can be called as RAW(restriction access window, restricted access window), but be not limited to this title.
When further the second Transmit-Receive Unit finishes specifically for the reserved time slot current described in execution mode, suspend and send described sign frame; In current beacon interval, be positioned at another reserved time slot after the described reserved time slot of current beacon interval or another beacon interval current beacon interval after, continue the described sign frame of transmission to obtain described downlink data.
Or when the second Transmit-Receive Unit finishes specifically for the reserved time slot current, stop sending described sign frame; In current beacon interval, be positioned at another reserved time slot after the described reserved time slot of current beacon interval or another beacon interval after current beacon interval, resend described sign frame to obtain described downlink data.
Correspondingly, AP at least retains the data that will send to data acquisition facility 70 before current Beacon Interval finishes.Aforesaid the first Transmit-Receive Unit 710 and the second Transmit-Receive Unit 720 can be logical blocks in the processor unit in a subscriber equipment or STA or directly by processor unit, carry out specific implementation.
In another embodiment of the present invention, in reserved time slot, the PS-Poll sending when the first Transmit-Receive Unit 710, the upstream data DATA that Trigger or described STA send loses or makes mistakes, or PS-Poll, the ACK of the upstream data DATA that Trigger or described STA send loses or makes mistakes, or when the DATA that AP sends loses or makes mistakes, cannot the corresponding time slot in this reserved time slot successfully receive data, at this time, if PS-Poll number of retransmissions does not also arrive maximum retransmission, in the second Transmit-Receive Unit 720 another Beacon interval after current Beacon interval, select a reserved time slot, and the corresponding time slot in this reserved time slot sends PS-Poll again, the upstream data DATA that Trigger or described STA send obtains downlink data, that is to say, in the present embodiment, do not limit the second Transmit-Receive Unit 720 and can only within current Beacon Interval, retransmit PS-Poll, the upstream data DATA that Trigger or described STA send obtains downlink data, but other Beacon Interval further expanding to after current Beacon Interval retransmits PS-Poll, the upstream data DATA that Trigger or described STA send.
Correspondingly, AP should retain will send to the data of data acquisition facility 70 until data acquisition facility 70 correctly receives this packet, or data re-transmitting number of times reached maximum retransmission, or this packet is overtime is dropped.
The embodiment of the present invention is by above technical scheme, when data acquisition facility, know there is its downlink data, but while correctly not obtaining the downlink data of self in the time slot of appointment in the current period, after this period, reselect another time slot and again send PS-Poll, the upstream data DATA that Trigger or described STA send obtains data, thereby make to work as PS-Poll, the upstream data DATA that Trigger or described STA send loses or makes mistakes, PS-Poll, the ACK of the upstream data DATA that Trigger or described STA send loses or makes mistakes or when DATA that AP sends loses or makes mistakes, STA still can correctly obtain data, improved the reliability of transfer of data between STA and AP.
Embodiment tetra-, and the method that the embodiment of the present invention also provides STA in a kind of WLAN (wireless local area network) to send data sends upstream data for the STA of WLAN (wireless local area network) to the AP of its access.Figure 8 shows that STA in the WLAN (wireless local area network) that the embodiment of the present invention provides obtains the method flow diagram of data, according to Fig. 8, the method comprises:
Step 801, STA receives the beacon that AP sends, and in the corresponding time slot in described beacon in indicated reserved time slot, sends upstream data bag; Described time slot is that a period of time in the reserved time slot in current beacon interval is interval;
Step 802, when this STA can not the assigned timeslot in described reserved time slot successfully sends described upstream data bag, if the number of retransmissions of this packet does not also arrive maximum retransmission, this STA, after described reserved time slot, sends this upstream data bag again.
Particularly, in one embodiment, as shown in Figure 9, when the assigned timeslot of STA in reserved time slot RAW, correctly do not receive the ACK of sent out data, represent that this packet is not successfully sent, at this time, if the number of retransmissions of this packet does not also arrive maximum retransmission (can setup parameter, be generally 7 times), this STA is in current Beacon interval, another reserved time slot after reserved time slot RAW, selects corresponding time slot again to send this packet.
In another embodiment, as shown in figure 10, STA also can resend upstream data bag after current Beacon Interval.
It should be noted that in addition, reserved time slot can be called as RAW, but be not limited to this title, the mode that Fig. 9, Figure 10 resend when just explanation cannot send upstream data by way of example simultaneously, but the title of RAW3 and the position of discharging might not as shown in Figure 9, Figure 10, can be selected according to actual needs flexibly.
The embodiment of the present invention is by above technical scheme, during for timeslot-based CSMA/CA channel access, cannot process the situation of unsuccessful transmission data, provide a kind of new mechanism allow STA again competitive channel to send upstream data, when STA does not successfully send upstream data to AP in the time slot of appointment in the current period, after this period, reselect another time slot and again send upstream data, when thereby the ACK that makes upstream data bag loses or makes mistakes, STA still can correctly send data, has improved the reliability of transfer of data between STA and AP.
Finally it should be noted that: above embodiment only, in order to technical scheme of the present invention to be described, is not intended to limit; Although the present invention is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (6)
1. a method for competitive channel in WLAN (wireless local area network), is characterized in that, comprising:
STA sends PS-Poll, Trigger or upstream data DATA based on competition mechanism, when time slot finishes, STA stops PS-Poll, Trigger or the upstream data DATA of transmission not yet sent successfully, the state of current competition mechanism is frozen, until current or follow-up, compete the state of the competition mechanism based on freezing continuation competition again in the period, continue PS-Poll, Trigger or the upstream data DATA of transmission not yet sent successfully.
2. method according to claim 1, is characterized in that, described competition mechanism is: distributed coordination function DCF or improved distributed channel access EDCA mechanism.
3. method according to claim 1, is characterized in that, described current or follow-up competition period is the competition period in current beacon interval BI or follow-up BI.
4. a device for competitive channel in WLAN (wireless local area network), is characterized in that, comprising:
Based on competition mechanism, send PS-Poll, Trigger or upstream data DATA, when time slot finishes, stop PS-Poll, Trigger or the upstream data DATA of transmission not yet sent successfully, the state of current competition mechanism is frozen, until current or follow-up, compete the state of the competition mechanism based on freezing continuation competition again in the period, continue the module of PS-Poll, Trigger or the upstream data DATA of transmission not yet sent successfully.
5. method according to claim 4, is characterized in that, described competition mechanism is: distributed coordination function DCF or improved distributed channel access EDCA mechanism.
6. method according to claim 4, is characterized in that, described current or follow-up competition period is the competition period in current beacon interval BI or follow-up BI.
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| CN201210535099.6A CN103517329B (en) | 2012-06-18 | 2012-12-12 | STA obtains and sends method, the device of data in WLAN |
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| CN111918406A (en) * | 2019-05-09 | 2020-11-10 | 中兴通讯股份有限公司 | Wireless access method and device |
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