CN104079375B - STA obtains and sent the method, apparatus of data in WLAN - Google Patents
STA obtains and sent the method, apparatus of data in WLAN Download PDFInfo
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- CN104079375B CN104079375B CN201410028575.4A CN201410028575A CN104079375B CN 104079375 B CN104079375 B CN 104079375B CN 201410028575 A CN201410028575 A CN 201410028575A CN 104079375 B CN104079375 B CN 104079375B
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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
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Abstract
The method that the embodiment of the present invention provides competitive channel in a kind of WLAN, including：STA is based on competition mechanism and sends PS Poll, Trigger or upstream data DATA, at the end of time slot, STA stops PS Poll, the Trigger or upstream data DATA of transmission not yet sent successfully, the state of current competition mechanism is frozen, until state again based on the competition mechanism freezed continues to compete in the current or follow-up competition period, continue PS Poll, the Trigger or upstream data DATA of transmission not yet sent successfully；Correspondingly, the embodiment of the present invention additionally provides a kind of device of competitive channel, by above technical scheme, the race condition before allowing to compete period fast quick-recovery, saves energy consumption.
Description
Technical field
Method, the dress of data are obtained and sent the present invention relates to STA in communication technical field, more particularly to WLAN
Put.
Background technology
In WLAN（Wireless Local Area Networks, WLAN) in, because STA（Station,
Wireless site）Usually battery powered, energy constraint, the MAC defined according to IEEE802.11（Medium Access
Control, media intervention control）Layer specification, AP（Access Point, access point）According to BI（Beacon Interval, letter
Mark interval）Periodic broadcast Beacon（Beacon）, the STA periodic wakeups in a power-save mode that work simultaneously receive beacon, wherein,
Beacon is a kind of management frame for notifying some customizing messages of STA, includes data structure TIM in beacon（Traffic
Indication Map, transmission instruction mapping）, for notifying whether STA is cached with its data frame in AP；TIM be in itself by
2008 virtual bit mapping tables formed, each position in TIM can correspond to specific STA, the status representative of each
Whether AP is cached with the corresponding STA of this data.
At present comprising the intelligent meter reading scene for supporting at most reachable 6000 STA in 802.11ah application scenarios, when a large amount of
, it is necessary to send PS-Poll after STA wake-ups（Power saving-poll）Frame obtains downlink data, and PS-Poll is a kind of control that STA is sent
Frame, for obtaining the data cached in the AP from AP；And competition caused by a large amount of PS-Poll can cause have low energy consumption requirement
STA produces additional energy.Further, since Offloading STA and Sensor STA coexist in network, and Sensor STA by
In the reason such as transmission power is small, it is possible to as Offloading STA hidden node, so resulted in low energy consumption requirement
Sensor STA be easier to collide with Offloading STA, so as to repeatedly retransmitting and produce additional energy.
To solve problem above, prior art proposes timeslot-based competing method, this method combine based on when
The access of gap division and CSMA/CA, it is desirable to which each time slots of the STA belonging to it starts competitive channel.In addition, will also competition
Send PS-Poll and AP transmission downlink datas to be distinguished, be respectively divided in different periods：STA is in a specific time period
Assigned timeslot competes PS-Poll, and AP, according to the order for receiving PS-Poll, is referring in another period after the specific time period
Data are sent in timing gap.So PS-Poll, which is broken up and sent respectively with downlink data, can reduce what PS-Poll conflicted
Probability, and the STA of successful contention to channel can be made to be transferred to sleep and waken up again when AP will be sent to his downlink data, this
Sample reduces the energy consumption of wait.
Although prior art provides the PS-Poll competing methods broken up, still, when STA can not be in division
Between when being properly received downlink data in section, lack corresponding treatment mechanism, in addition, being sent in the upstream data divided based on time slot
When unsuccessful, existing algorithm also can not processing data bag retransmit the problem of.Therefore, when PS-Poll loses or malfunctions, PS-Poll
Acknowledgement frame ACK lose or error or AP send DATA lose or error when, STA all can not correctly obtain downlink data or
Person sends upstream data.
The content of the invention
The embodiment of the present invention provides STA in a kind of WLAN and obtains and send the method, apparatus of data, so that wirelessly
STA in LAN, can with more in time, more accurately obtain/send data, reduce data loss rate.
The embodiment of the present invention provides a kind of method that site STA obtains data in WLAN, is accessed for STA from it
Access point AP obtain data, including：
STA after knowing the downlink data that the AP has the STA, wraps according to the beacon received according in the beacon
The transmission instruction contained maps TIM, and PS-Poll, Trigger or described STA are sent in the reserved time slot in current Beacon Interval
The upstream data DATA of transmission and receive the AP receiving described PS-Poll, Trigger or described STA transmission it is up
The downlink data returned after data DATA；If the STA can not be properly received the downlink data in the reserved time slot
When, then the STA is in the reserved time slot and then the secondary upstream data for sending PS-Poll, Trigger or described STA and sending
DATA is to obtain the downlink data.
The embodiment of the present invention also provides a kind of data acquisition facility, for obtaining number from the access point AP in WLAN
According to the device includes：
First Transmit-Receive Unit, for coming from the AP beacons according to what is received, know that the AP has that the STA's is descending
After data, according to the transmission instruction mapping TIM included in the beacon, sent in the reserved time slot in current Beacon Interval
PS-Poll, Trigger or described STA send upstream data DATA and receive the AP receive the PS-Poll,
The downlink data returned after the upstream data DATA that Trigger or described STA are sent, the reserved time slot are in beacon interval
A period of time section；Second Transmit-Receive Unit, for can not be properly received when first Transmit-Receive Unit in the reserved time slot
During the downlink data, sent in the reserved time slot and then secondary transmission PS-Poll, Trigger or described STA up
Data DATA is to obtain the downlink data.
The embodiment of the present invention provides a kind of method that site STA obtains data in WLAN, is accessed for STA from it
Access point AP obtain data, including：
STA receives the beacon that AP is sent, and the corresponding time slot in the reserved time slot indicated by the beacon sends line number
According to bag；When the STA can not be successfully transmitted the upstream data bag in the assigned timeslot in the reserved time slot, if should
The number of retransmissions of packet does not arrive maximum retransmission also, then the STA the reserved time slot and then it is secondary send this on line number
According to bag.
The embodiment of the present invention is by above technical scheme, for that can not be handled during timeslot-based CSMA/CA channel access
The situation of unsuccessful reception/transmission data, there is provided a kind of new mechanism allow STA again competitive channel with obtain downlink information or
Person sends uplink information, knows have its downlink data or STA to be allowed to send upstream data as STA, but not in present period
In when correctly obtaining the downlink data of itself or send upstream data in the time slot specified, reselect another after this period of time
Time slot send again PS-Poll, Trigger or described STA transmission upstream data DATA come obtain data or again send on
Row data, so that when PS-Poll, Trigger or described STA upstream data DATA sent lose or malfunction, PS-
The DATA that the ACK for the upstream data DATA that Poll, Trigger or described STA are sent loses or error, AP are sent loses or gone out
When wrong or upstream data bag ACK loses, STA remains able to correct acquisition or sends data, improves between STA and AP
The reliability of data transfer.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also
To obtain other accompanying drawings according to these accompanying drawings.
Fig. 1 is the network topological diagram of network system provided in an embodiment of the present invention；
Fig. 2 is the method flow diagram that STA obtains data in WLAN provided in an embodiment of the present invention；
Fig. 3 is the method schematic diagram that STA obtains data in WLAN provided in an embodiment of the present invention；
Fig. 4 is the method schematic diagram that STA obtains data in WLAN provided in an embodiment of the present invention；
Fig. 5 is the method schematic diagram that STA obtains data in WLAN provided in an embodiment of the present invention；
Fig. 6 is user equipment exemplary plot provided in an embodiment of the present invention；
Fig. 7 is data acquisition facility exemplary plot provided in an embodiment of the present invention；
Fig. 8 is the method flow diagram that STA sends data in WLAN provided in an embodiment of the present invention；
Fig. 9 is the method schematic diagram that STA sends data in WLAN provided in an embodiment of the present invention；
Figure 10 is the method schematic diagram that STA sends data in WLAN provided in an embodiment of the present invention.
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 carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
The embodiment of the present invention one provides a kind of method that STA obtains data in WLAN, in WLAN
AP for accessing from it of STA obtain data.Fig. 1 show the typical network topology structure chart using technical solution of the present invention, root
According to Fig. 1, WLAN 100 includes：Access point（AP, Access Point）120, and network is accessed by access point 120
Website（STA, Station）110-115, the STA110-115 being associated with same AP120 form a Basic Service Set
（BSS）；WLAN 100 accesses backbone network 140 by gateway 130, and then is connected to the server in network.
It should be noted that the STA in all embodiments of the invention refers to the basic logic entity in WLAN,
STA is specifically as follows the terminal device comprising wireless lan interfaces, and such as many mobile phones, tablet personal computer all prop up in the market
Hold wireless lan interfaces, portable machine also built-in wireless lan interfaces.Do not possess WLAN in itself for some to connect
The equipment of mouth, can provide wireless lan interfaces by way of installing WLAN wireless network cards for it.
It should also be noted that, in all embodiments of the invention, " reserved time slot " is defined as beacon interval is segmented
The time interval obtained afterwards, if the RAW in Fig. 3 is a reserved time slot, RAW1 and RAW2 are the one of reserved time slot RAW
Part；Further, one " reserved time slot " can be sub-divided into smaller time interval, be referred to as " time slot ", in the present invention
In embodiment, time slot is the minimum time unit for sending and receiving data frame, control frame or management frame.Meanwhile this area
Technical staff is it is understood that a beacon interval can be divided into two or more reserved time slot, and each reserve
Period can be subdivided into multiple smaller time slots again.
Fig. 2 show the method flow diagram that STA in WLAN provided in an embodiment of the present invention obtains data, according to figure
2, this method includes：
Step 201, STA is according to the beacon received, after knowing that AP has its downlink data, according to what is included in the beacon
TIM, PS-Poll, Trigger are sent in the reserved time slot in current Beacon Interval（Trigger frame）Or the STA transmissions is upper
Row data DATA,（The upstream data DATA that PS-Poll, Trigger or described STA are sent is properly termed as indicating frame）And receive institute
State the downlink data that AP is returned after the sign frame is received.
Specifically, as shown in figure 3, in one embodiment, the idiographic flow of implementation steps 201 is as follows：Sent in AP
After Beacon, in current beacon interval, a part of period is reserved（Such as the reserved time slot RAW1 in Fig. 3）Sent for STA
The upstream data DATA that PS-Poll, Trigger or described STA are sent is used；After RAW1, a part of period is reserved（Such as figure
Reserved time slot RAW2 in 3）Downlink data is sent for AP to use to STA；Only it is identified as in the TIM that current Beacon is included
The first time slot that 1 STA allows to specify in RAW1 sends the upstream data that PS-Poll, Trigger or described STA are sent
DATA, sleep state can be transferred to by being successfully transmitted the upstream data DATA of PS-Poll, Trigger or described STA transmissions STA,
And in RAW2 corresponding second time slot wake up receive downlink data；Receive STA PS-Poll, Trigger or described STA
After the upstream data DATA of transmission, AP arranges the transmission of downlink data in RAW2, wherein, according to definition before, when first
Gap and the second time slot are special time section in reserved time slot, and the length of the first time slot and the second time slot can be according to reality
Border demand flexibly defines；Such as in a preferred embodiment of the invention, the length of the first time slot can be TS1=PS-
Poll+SIFS+ACK, 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 goes to send respectively
The upstream data DATA and receive downlink data that PS-Poll, Trigger or described STA are sent；Those skilled in the art can be with
Understand, two different time-gaps in being set aside some time at one can also be used to go to send PS-Poll, Trigger or described
The upstream data DATA and receive downlink data that STA is sent.
Step 202, it is described if the STA can not be properly received the downlink data in the reserved time slot
STA is in the reserved time slot and then secondary sends upstream data DATA that PS-Poll, Trigger or described STA sends to obtain
Take the downlink data.
Specifically, as shown in figure 4, in one embodiment, within the reserved period（That is the RAW in Fig. 4）If STA
The upstream data DATA that PS-Poll, Trigger or the described STA sent is sent loses or error（Such as Fig. 4（a）It is shown）, or
The ACK for the upstream data DATA that PS-Poll, Trigger or described STA are sent loses or error（Such as Fig. 4（b）It is shown）, or
The DATA that AP is sent loses or error（Such as Fig. 4（c）It is shown）, can all cause the STA can not be in specified in reserved time slot RAW
Successful data reception in gap, at this time, if the PS-Poll number of retransmissions of the STA（The parameter that can be set, usually 7 times）
Do not arrive maximum retransmission also, then the STA is in current Beacon interval, from another after reserved time slot RAW
Reserved time slot, select corresponding time slot to send the upstream data DATA of PS-Poll, Trigger or described STA transmission again and obtain
Take downlink data.The reserved time slot of division can be referred to as RAW in wherein Beacon Interval（Limiting and access window,
restricted access window）, but it is not limited to this title.
Further, as a kind of embodiment, STA can not in the assigned timeslot in reserved time slot RAW successful data reception
Afterwards, the STA is corresponding from another reserved time slot after reserved time slot RAW, selection in current Beacon interval
The upstream data DATA that time slot sends PS-Poll, Trigger or described STA transmission again obtains downlink data.In this tool
In the implementation of body, whether the PS-Poll number of retransmissions that can be not concerned with STA reaches maximum retransmission.
In the present embodiment, STA can not be a kind of the reason for successful data reception in the assigned timeslot in reserved time slot RAW
It is probably that STA sends the upstream data DATA failures that PS-Poll, Trigger or described STA are sent and led in reserved time slot
Cause can not correctly obtain data.Such as due to PS-Poll, Trigger or described STA send upstream data DATA transmission when
Between or the upstream data DATA ACK that sends of PS-Poll, Trigger or described STA receive the time and must not surmount setting time slot
Failure is sent caused by border.Such as the upstream data DATA of PS-Poll, Trigger or described STA transmissions re-transmission
Number fails caused by reaching default number of retransmissions.STA can not be properly received number in the assigned timeslot in reserved time slot RAW
According to the reason for it is alternatively possible be that AP sends downlink data failure, for example, data are not properly received, the ACK that STA is sent does not have
It is properly received, either can not resends data or ACK due to reaching time slot limited boundary.
Correspondingly, AP retains the data that be sent to the STA at least before current Beacon Interval terminate.
In another embodiment of the present invention, as shown in figure 5, in reserved time slot RAW, as the PS- that STA is sent
The upstream data DATA that Poll, Trigger or described STA are sent loses or error（Such as Fig. 5（a）It is shown）, or PS-Poll,
The ACK for the upstream data DATA that Trigger or described STA are sent loses or error（Such as Fig. 5（b）It is shown）, or AP transmissions
DATA loses or error（Such as Fig. 5（c）It is shown）When, STA will be unable to the corresponding time slot successful data reception in RAW, at this time,
If the PS-Poll number of retransmissions of the STA does not arrive maximum retransmission also, the STA is after current Beacon interval
Another Beacon interval in, select a reserved time slot, and the corresponding time slot in the reserved time slot is sent again
The upstream data DATA that PS-Poll, Trigger or described STA is sent obtains downlink data, that is to say, that in the present embodiment
In, PS-Poll, Trigger or described STA transmissions can only be retransmitted within current Beacon Interval by not limiting STA
Upstream data DATA obtains downlink data, but further expands to other after current Beacon Interval
Beacon Interval come retransmit PS-Poll, Trigger or described STA transmission upstream data DATA.
Further, should after the corresponding time slot successful data reception that another embodiment STA will be unable in RAW
STA selects a reserved time slot in another Beacon interval after current Beacon interval, and at this
The upstream data DATA that corresponding time slot in reserved time slot sends PS-Poll, Trigger or described STA transmission again is obtained
Downlink data.
Correspondingly, AP should retain the data that be sent to the STA until STA has correctly received the packet, or number
Maximum retransmission is reached according to sending times, or the packet time-out is dropped.
In the implementation process of the present invention, STA is based on DCF（Distributed coordination function are distributed
Formula coordination function）Or EDCA（Enhanced Distributed Channel Access, improved distributed channel access）
Mechanism competition sends the upstream data DATA that PS-Poll, Trigger or described STA are sent, and at the end of time slot, STA stops weight
Send out upstream data DATA, corresponding DCF or EDCA that PS-Poll, Trigger or the described STA being not yet successfully transmitted are sent
State is frozen, until being continued again based on current DCF or EDCA states in the competition period in current BI either follow-up BI
Competition, continue the upstream data DATA that PS-Poll, Trigger or described STA of transmission not yet sent successfully are sent, can also
The transmission sent will be needed by resending the upstream data DATA of PS-Poll, Trigger or described STA transmissions of transmission
The upstream data DATA that PS-Poll, Trigger or described STA are sent is retransmited once again.Or STA is according to slot length
Most number of retransmissions that current time slots are allowed are calculated, when number of retransmissions is more than most re-transmissions that current time slots are allowed
During number, stop retransmitting, corresponding DCF or EDCA states are frozen, the competition period in current BI or follow-up BI
In continue to compete based on current DCF or EDCA states again.Also a kind of mode can be that STA calculates according to slot length
Most number of retransmissions that current time slots are allowed, and current maximum retransmission is set to, when in current time slots
When number of retransmissions reaches maximum retransmission, stop retransmit, and STA again competitive channel when DCF states with stop retransmit before
DCF states it is unrelated.
The embodiment of the present invention is by above technical scheme, for that can not be handled during timeslot-based CSMA/CA channel access
The situation of unsuccessful reception/transmission data, there is provided a kind of new mechanism allow STA again competitive channel to obtain downlink information,
When knowing there is its downlink data as STA, but the downlink data of itself correctly obtained in the time slot do not specified in present period,
The upstream data that another time slot sends PS-Poll, Trigger or described STA transmissions again is reselected after this period of time
DATA obtains data, so that when the upstream data DATA that PS-Poll, Trigger or described STA is sent loses or goes out
The ACK for the upstream data DATA that mistake, PS-Poll, Trigger or described STA are sent loses or the DATA of error or AP transmissions
When losing or malfunctioning, STA remains able to correctly obtain data, improves the reliability of data transfer between STA and AP.
Embodiment two, the embodiment of the present invention further provide the device for realizing each step and method in above method embodiment
Embodiment.The embodiment of the present invention can be applied in various communication systems, it is particularly possible to be adapted to network system as shown in Figure 1
In, such as can be a user equipment or STA.Fig. 6 shows a kind of structure chart of user equipment, according to Fig. 6, Yong Hushe
Standby 10 include：Processing unit 101, memory 102 and antenna 103.Processing unit 101 controls the operation of user equipment 10, processing
Unit 101 can also be referred to as CPU.Memory 102 can include read-only storage and random access memory, for single to processing
Member 101 provides instruction and data.The a part of of memory 102 can also include non-volatile row random access memory（NVRAM）.
In specific application, it itself can be exactly either such as WAP, WiFI focuses or nothing that user equipment 10, which can be embedded in,
The Wireless Telecom Equipment of line router etc.Each component of user equipment 10 is coupled by bus system 100, wherein
Bus system is in addition to including data/address bus, in addition to power bus, controlling bus and status signal bus in addition.But in order to clear
For the sake of explanation, various buses are all designated as bus system 100 in figure..
The method that the STA that the embodiment of the present invention discloses obtains data can apply to the user equipment 10 that the present embodiment provides
In, realized in other words by user equipment 10.In implementation process, each step of the above method can pass through user equipment 10
The integrated logic circuit of hardware or the instruction of software form are completed.These instructions can pass through the processing unit of user equipment 10
101 realize and control to coordinate.Method for performing the announcement of the embodiment of the present invention one, processing unit 101 can be general place
Manage device, digital signal processor（DSP）, application specific integrated circuit（ASIC）, ready-made programmable gate array（FPGA）Or other can
Programmed logic device, discrete gate or transistor logic, discrete hardware components.
Specifically, in the user equipment 10 that the embodiment of the present invention two provides, antenna 103 is used to receive and led to user equipment 10
The beacon that the AP of letter connection is sent, wherein, beacon is a kind of management frame that AP is used to notify some customizing messages of STA, and AP is sent out
Time interval between the two adjacent beacons sent is BI（Beacon Interval, beacon slot）；
Processing unit 101, in the beacon received according to antenna 103, knowing that the AP has under user equipment 10
After row data, according to the transmission instruction mapping TIM included in the beacon, sent in the reserved time slot in current Beacon Interval
PS-Poll, Trigger or described STA send upstream data DATA and receive the AP receive the PS-Poll,
The downlink data returned after the upstream data DATA that Trigger or described STA are sent.
Further, processing unit 101 is additionally operable to, when can not be properly received the downlink data in the reserved time slot
When, in the reserved time slot and then secondary upstream data DATA that PS-Poll, Trigger or described STA sends is sent to obtain
Take the downlink data.
Specifically, as shown in figure 4, in one embodiment, within the reserved period（That is the RAW in Fig. 4）If user
The upstream data DATA that PS-Poll, Trigger or described STA that equipment 10 is sent are sent loses or error（Such as Fig. 4（a）Institute
Show）, or the upstream data DATA of PS-Poll, Trigger or described STA transmissions ACK loss or error（Such as Fig. 4（b）Institute
Show）, or the DATA loss of AP transmissions or error（Such as Fig. 4（c）It is shown）, all can cause user equipment 10 can not be in reserved time slot
Successful data reception in assigned timeslot in RAW, at this time, if the PS-Poll number of retransmissions of user equipment 10 does not arrive also most
Big number of retransmissions, then processing unit 101 in current Beacon interval, from after reserved time slot RAW another is reserved
Period, select corresponding time slot to send the upstream data DATA of PS-Poll, Trigger or described STA transmission again and obtain down
Row data.The reserved time slot of division can be referred to as RAW in wherein Beacon Interval（Limiting and access window,
restricted access window）, but it is not limited to this title.
Correspondingly, AP retains the data that be sent to user equipment 10 at least before current Beacon Interval terminate.
In another embodiment of the present invention, as shown in figure 5, in reserved time slot RAW, sent when user equipment 10
The upstream data DATA that PS-Poll, Trigger or described STA are sent loses or error（Such as Fig. 5（a）It is shown）, or PS-
The ACK for the upstream data DATA that Poll, Trigger or described STA are sent loses or error（Such as Fig. 5（b）It is shown）, or AP hairs
The DATA sent loses or error（Such as Fig. 5（c）It is shown）When, the corresponding time slot that user equipment 10 will be unable in RAW is properly received
Data, at this time, if the PS-Poll number of retransmissions of user equipment 10 does not arrive maximum retransmission also, processing unit 101 exists
In another Beacon interval after current Beacon interval, a reserved time slot is selected, and it is reserved at this
The upstream data DATA that corresponding time slot in period sends PS-Poll, Trigger or described STA transmissions again is descending to obtain
Data, that is to say, that in the present embodiment, limit only within current Beacon Interval retransmit PS-Poll,
The upstream data DATA that Trigger or described STA are sent obtains downlink data, but further expands in current Beacon
Other Beacon Interval after Interval retransmit the upstream data of PS-Poll, Trigger or described STA transmissions
DATA。
Correspondingly, AP should retain the data of user equipment 10 to be sent to until user equipment 10 has correctly received the number
Maximum retransmission is reached according to bag, or data re-transmitting number, or the packet time-out is dropped.
Memory 102 is used for, the data obtained for storage processing unit 101.
The embodiment of the present invention passes through above technical scheme, there is provided the STA for handling downlink data can not be in the time of division
The mechanism of downlink data is properly received in section, knows there is its downlink data as STA, but the time slot do not specified in present period
In when correctly obtaining the downlink data of itself, reselect after this period of time another time slot send again PS-Poll,
The upstream data DATA that Trigger or described STA are sent obtains data, so that work as PS-Poll, Trigger or described
The upstream data DATA's that the upstream data DATA that STA is sent loses or error, PS-Poll, Trigger or described STA are sent
ACK lose or error or AP send DATA lose or error when, STA remains able to correctly obtain data, improve STA and
The reliability of data transfer between AP.
Embodiment three, the embodiment of the present invention provide a kind of data acquisition facility, for from the access point in WLAN
AP obtains data, as shown in fig. 7, the device includes：First Transmit-Receive Unit 710, the second Transmit-Receive Unit 720；
Wherein, the first Transmit-Receive Unit 710, for according to the beacon received, after knowing that the AP has its downlink data, root
According to the TIM included in the beacon, PS-Poll, Trigger or described are sent in the reserved time slot in current Beacon Interval
STA send upstream data DATA and receive the AP receiving described PS-Poll, Trigger or described STA transmission it is upper
The downlink data returned after row data DATA；
Specifically, after Beacon is received, if in the TIM that current Beacon is included, with the data acquisition facility
1 is identified as corresponding to 70, then the first Transmit-Receive Unit 710 is specified in reserved time slot the first time slot send PS-Poll,
The upstream data DATA that Trigger or described STA are sent, it is successfully transmitted the up of PS-Poll, Trigger or described STA transmissions
After data DATA, data acquisition facility 70 can be transferred to sleep state, and corresponding second time slot is waken up in the reserved time slot
Receive downlink data；Correspondingly, AP is receiving PS-Poll, Trigger or described STA hairs of the transmission of data acquisition facility 70
After the upstream data DATA sent, the transmission of downlink data is arranged in reserved time slot, wherein, according to definition before, when first
Gap and the second time slot are special time section in reserved time slot, and the length of the first time slot and the second time slot can be according to reality
Border demand flexibly defines；In a preferred embodiment of the invention, the length of the first time slot can be TS1=PS-Poll+
SIFS+ACK, the second slot length can be TS2=DATA+SIFS+ACK.
In addition, in embodiments of the present invention, corresponding time slot of first Transmit-Receive Unit 710 in two different reserved time slots
Go to send upstream data DATA and reception downlink data that PS-Poll, Trigger or described STA are sent respectively；This area skill
It is understood that the first Transmit-Receive Unit 710 can also set aside some time at one, two interior different time-gaps go to send art personnel
The upstream data DATA and receive downlink data that PS-Poll, Trigger or described STA are sent, here is omitted.
Second Transmit-Receive Unit 720, for it can not be properly received when the first Transmit-Receive Unit 710 in the reserved time slot described in
During downlink data, then in the reserved time slot and then the secondary upper line number for sending PS-Poll, Trigger or described STA and sending
According to DATA to obtain the downlink data.
In one embodiment, within the reserved period, if the first Transmit-Receive Unit 710 send PS-Poll,
The upstream data DATA that Trigger or described STA are sent loses or error, or PS-Poll, Trigger or described STA are sent
Upstream data DATA ACK lose or error, or the DATA that send of AP lose or error, can all cause the STA can not be
Successful data reception in assigned timeslot in the reserved time slot, at this time, if PS-Poll number of retransmissions does not arrive maximum re-transmission also
Number, then the second Transmit-Receive Unit 720 in current Beacon interval, from after the reserved time slot another it is reserved when
Duan Zhong, select corresponding time slot to send the upstream data DATA/ of PS-Poll, Trigger or described STA transmission again and obtain
Downlink data.The reserved time slot of division can be referred to as RAW in wherein Beacon Interval（Limiting and access window,
restricted access window）, but it is not limited to this title.
Second Transmit-Receive Unit described in further embodiment is specifically used at the end of current reserved time slot, pause hair
Send the sign frame；In current Beacon Interval in the current Beacon Interval after the reserved time slot another it is reserved when
Section or in another beacon interval after current Beacon Interval, continues to send the sign frame to obtain the lower line number
According to.
Or second Transmit-Receive Unit be specifically used at the end of current reserved time slot, terminate and send the sign frame；
It is located at another reserved time slot in current Beacon Interval after the reserved time slot in current Beacon Interval or believes currently
In another beacon interval after mark interval, the sign frame is resend to obtain the downlink data.
Correspondingly, AP retains at least before current Beacon Interval terminate will be sent to data acquisition facility 70
Data.Foregoing the first Transmit-Receive Unit 710 and the second Transmit-Receive Unit 720 can be the processing in a user equipment or STA
A logic unit in device unit is directly implemented by processor unit.
In another embodiment of the present invention, in reserved time slot, the PS-Poll that sends when the first Transmit-Receive Unit 710,
The upstream data DATA that Trigger or described STA are sent loses or error, or PS-Poll, Trigger or described STA are sent
Upstream data DATA ACK lose or error, or AP send DATA lose or error when, will be unable in the reserved time slot
Interior corresponding time slot successful data reception, at this time, if PS-Poll number of retransmissions does not arrive maximum retransmission also, second
Transmit-Receive Unit 720 is in another Beacon interval after current Beacon interval, when selection one is reserved
Section, and the corresponding time slot in the reserved time slot sends the upstream data of PS-Poll, Trigger or described STA transmissions again
DATA obtains downlink data, that is to say, that in the present embodiment, not limiting the second Transmit-Receive Unit 720 can only be current
Upstream data DATA that PS-Poll, Trigger or described STA sends is retransmitted within Beacon Interval to obtain lower line number
According to, but other Beacon Interval for further expanding to after current Beacon Interval retransmit PS-
The upstream data DATA that Poll, Trigger or described STA are sent.
Correspondingly, AP should retain the data of data acquisition facility 70 to be sent to until data acquisition facility 70 correctly connects
The packet is received, or data re-transmitting number has reached maximum retransmission, or the packet time-out is dropped.
The embodiment of the present invention knows there is its downlink data, but do not exist by above technical scheme when data acquisition facility
When the downlink data of itself is correctly obtained in the time slot specified in present period, another time slot is reselected after this period of time again
It is secondary to send upstream data DATA that PS-Poll, Trigger or described STA sends to obtain data so that when PS-Poll,
The upstream data DATA loss or error, PS-Poll, Trigger or described STA that Trigger or described STA are sent send upper
When row data DATA ACK loses or the DATA of error or AP transmissions loses or malfunctioned, STA remains able to correctly obtain number
According to improving the reliability of data transfer between STA and AP.
Example IV, the embodiment of the present invention also provides a kind of method that STA sends data in WLAN, for wireless
The AP that STA in LAN accesses to it sends upstream data.Fig. 8 is shown in WLAN provided in an embodiment of the present invention
STA obtains the method flow diagram of data, and according to Fig. 8, this method includes：
Step 801, STA receives the beacon that AP is sent, the corresponding time slot in the beacon in indicated reserved time slot
Middle transmission upstream data bag；The time slot is a period of time section in the reserved time slot in current Beacon Interval；
Step 802, when the STA can not be successfully transmitted the upstream data bag in the assigned timeslot in the reserved time slot
When, if the number of retransmissions of the packet does not arrive maximum retransmission also, the STA is in the reserved time slot and then secondary
Send the upstream data bag.
Specifically, in one embodiment, as shown in figure 9, when assigned timeslots of the STA in reserved time slot RAW is without just
Acknowledgement represents that the packet is not successfully sent, at this time, if the number of retransmissions of the packet to the ACK of sent out data
Do not arrive maximum retransmission also（Can setup parameter, usually 7 times）, then the STA is in current Beacon interval, from pre-
Another reserved time slot after period RAW is stayed, selects corresponding time slot to send the packet again.
In another embodiment, as shown in Figure 10, STA can also be sent out again after current Beacon Interval
Send upstream data bag.
It is further to note that reserved time slot can be referred to as RAW, but be not limited to this title, while Fig. 9, Figure 10
Simply by illustrate can not send upstream data when the mode that resends, but RAW3 title and the position discharged
Putting might not as shown in Figure 9, Figure 10, can be flexibly selected according to being actually needed.
The embodiment of the present invention is by above technical scheme, for that can not be handled during timeslot-based CSMA/CA channel access
The unsuccessful situation for sending data, there is provided a kind of new mechanism allows STA, and competitive channel to send upstream data, works as STA again
When being successfully transmitted upstream data to AP in the time slot do not specified in present period, when reselecting another after this period of time
Gap sends upstream data again, so that when the ACK of upstream data bag loses or malfunctioned, STA remains able to correctly send number
According to improving the reliability of data transfer between STA and AP.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
The present invention is described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：It still may be used
To be modified to the technical scheme described in foregoing embodiments, or equivalent substitution is carried out to which part technical characteristic；
And these modifications or replacement, the essence of appropriate technical solution is departed from the scope of various embodiments of the present invention technical scheme.
Claims (6)
1. a kind of method of competitive channel in WLAN, it is characterised in that including：
The first time slot in a reserved time slot of the STA in current Beacon Interval be based on competition mechanism send PS-Poll,
Trigger or upstream data DATA；The current Beacon Interval includes at least two reserved time slots, in the current Beacon Interval
Another reserved time slot in second time slot corresponding with first time slot be present, for receive AP return downlink data；
At the end of first time slot, STA stops PS-Poll, Trigger or upstream data of transmission not yet sent successfully
DATA, the state of current competition mechanism are frozen, until it is current or it is follow-up competition the period in again based on the competition machine freezed
The state of system continues to compete, and continues PS-Poll, Trigger or upstream data DATA of transmission not yet sent successfully.
2. according to the method for claim 1, it is characterised in that the competition mechanism is：Distributed coordination function DCF or
Improved distributed channel accesses EDCA mechanism.
3. according to the method for claim 1, it is characterised in that the described current or follow-up competition period is between present beacon
The competition period in BI or follow-up BI.
A kind of 4. device of competitive channel in WLAN, it is characterised in that including：
The first time slot in a reserved time slot in current Beacon Interval is based on competition mechanism and sends PS-Poll, Trigger
Or upstream data DATA；The current Beacon Interval includes at least two reserved time slots, another in the current Beacon Interval
Second time slot corresponding with first time slot in individual reserved time slot be present, downlink data is returned for receiving AP；
At the end of first time slot, stop PS-Poll, Trigger or upstream data DATA of transmission not yet sent successfully,
The state of current competition mechanism is frozen, until the shape in the current or follow-up competition period again based on the competition mechanism freezed
State continues to compete, and continues PS-Poll, Trigger of transmission not yet sent successfully or upstream data DATA module.
5. device according to claim 4, it is characterised in that the competition mechanism is：Distributed coordination function DCF or
Improved distributed channel accesses EDCA mechanism.
6. device according to claim 4, it is characterised in that the described current or follow-up competition period is between present beacon
The competition period in BI or follow-up BI.
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| CN201210201041.8 | 2012-06-18 | ||
| 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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| CN101286980A (en) * | 2008-05-14 | 2008-10-15 | 华中科技大学 | Distributed media access control protocol for increasing capacity of wireless local area network |
| WO2011038531A1 (en) * | 2009-09-29 | 2011-04-07 | 西门子公司 | Communication method in a profinet communication system |
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| CN101252510A (en) * | 2008-03-26 | 2008-08-27 | 山东大学 | Method for enhancing wireless local area network system performance |
| CN101286980A (en) * | 2008-05-14 | 2008-10-15 | 华中科技大学 | Distributed media access control protocol for increasing capacity of wireless local area network |
| WO2011038531A1 (en) * | 2009-09-29 | 2011-04-07 | 西门子公司 | Communication method in a profinet communication system |
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