CN100588295C - Method of communication device initiated frame exchange - Google Patents

Method of communication device initiated frame exchange Download PDF

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CN100588295C
CN100588295C CN200380102024A CN200380102024A CN100588295C CN 100588295 C CN100588295 C CN 100588295C CN 200380102024 A CN200380102024 A CN 200380102024A CN 200380102024 A CN200380102024 A CN 200380102024A CN 100588295 C CN100588295 C CN 100588295C
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frame
access point
receiving
polling message
transceiver
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CN1709000A (en
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纳塔武特·斯马瓦特库尔
陈晔
斯蒂芬·伊梅奥特
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Motorola Solutions Inc
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Motorola Inc
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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

A method for accessing a wireless local area network (WLAN) channel and providing quality of service (QoS) for voice in a system supporting both voice and data services. Under the method, a communication device (302, 303) contends for a medium (channel). Upon identifying a transmit opportunity, the device transmits a voice packet to an access point (AP) (304) and polls the AP for downlink traffic.A low power implementation is feasible because the communication device can sleep, wake up to contend for the medium, transmit a voice packet to the AP, request a voice packet from the AP, transmit an acknowledgement, and go back to sleep.

Description

The method of communication device initiated frame exchange
Related application is quoted
The present invention requires the U.S. Provisional Application 60/421 that is entitled as " METHOD OFCOMMUNICATION DEVICE INITIATED FRAME EXCHANGE " of submission on October 25th, 2002,490 priority, it belongs to applicant of the present invention jointly, and is by reference that its integral body is incorporated at this.
Technical field
The present invention relates generally to the communications field, more specifically relate to the method for the business that between access point and a plurality of portable equipment, sends.
Background technology
Usually, wireless lan (wlan) equipment must be supported two kinds of channel access methods, that is, and and based on the access and the poll driving access of competition.Access based on competition allows any wireless terminal or access point to catch channel and send Frame after according to carrier sense process monitoring channel.On the other hand, when using poll to drive access procedure, all frame exchanges are all started by access point, perhaps by polling signal, perhaps by simply data being sent to one of a plurality of websites from access point.Be used in transmitting voice service between access point and a plurality of wireless terminal based on access technology competition or that poll drives, the expansion of two kinds of technology all can be used for providing the service between the voice-and-data service class of sharing single WLAN channel to distinguish.But the frame turnaround sequence of two kinds of procedure definitions all is a poor efficiency when the speech business that is used to provide between access point and a plurality of website.In addition, which kind of technology all can not provide enough supports to be used for the power save function of the wireless terminal of receiving and transmitting voice business.
ANSI/IEEE standard 802.11,1999 editions (hereinafter being called " 802.11 standard ") has defined the method for two kinds of different access channels.802.11 the 9.3rd joint of standard has defined the uncontested cut-in method based on poll.802.11 the 9.2nd joint of standard has defined the cut-in method based on the carrier sense competition.At this cut-in method of two types is described.
The WLAN frame turnaround sequence that uses uncontested cut-in method as shown in Figure 1.Under the method, communication equipment such as portable terminal (MT), woke up before each beacon transmissions, and waited for the poll of access point (AP).Beacon transmissions and can depend on the load level of network and the dispatching algorithm of AP in the time that specific MT receives between the polling message.With polling message, AP also sends downlink voice packet.Then, MT responds with affirmative acknowledgement (ACK) to downlink voice packet, and sends uplink voice packet to AP.After successfully receiving ACK and uplink voice packet, AP comes to make affirmative acknowledgement to successfully receiving to MT by sending positive acknowledgement message.After the frame turnaround sequence of success, MT can stop monitoring and controlling channels, and closes its transceiver.It should wake up once more and receive next beacon transmissions.Because the frame turnaround sequence described in Fig. 1 must be started by AP, MT must full-time wait start alarm.This makes the power drain on the MT battery, on average calculates, and it is proportional to the number of MT on the polling list of specific AP.
Use based on the competition cut-in method WLAN frame turnaround sequence as shown in Figure 2.Under the method, MT is when more upper-layer protocol receives packets of voice, and beginning comes competitive channel according to the random back-off time course of the 9.2.4 joint definition of the carrier sense process of the 9.2.1 joint definition of 802.11 standards and 802.11 standards.After winning the competition step and obtaining channel, MT sends uplink voice packet to AP.After past, AP comes to carry out affirmative acknowledgement to receiving uplink voice packet to MT by transmission ACK at the time window of a weak point (being represented by short interFrameGap SIFS).Independently, in the down link direction, AP is also beginning competitive channel when its network interface receives packets of voice.Similarly, AP just sends downlink voice packet to MT after winning competition.The frame turnaround sequence stops during in response to positive acknowledgement message at MT.After finishing the exchange of up link or downlink voice frames, dispatching station (for example AP or MT) called the random back-off process of the 9.2.4 joint definition of 802.11 standards before sending another speech frame.Because the downlink traffic flow uplink service flows is independent mutually, AP and fixed network are only depended in the timing of downlink transmission.Because MT can not control this timing, it is must full-time maintenance watchful, to wait for downlink transmission, has caused exhausting of MT battery thus, and it can cause the extra competition between down link and the uplink service transmission.
Therefore, need a kind of improved frame turnaround sequence to solve the defective of prior art.
Summary of the invention
According to first aspect present invention, provide a kind of in each service intervals, the method for communication device initiated frame exchange comprises: the transceiver that starts communication equipment; Every service intervals sends a polling message at least to access point, described polling message request downlink traffic frame, and wherein, receive described polling message at access point; Determine whether to receive the active downlink frame, wherein, described descending chain circuit frame sends from access point, and wherein, and described downlink traffic frame comprises the downlink traffic that mails to described communication equipment and to receiving the affirmative acknowledgement of described polling message; And inactive transceiver.
According to second aspect present invention, a kind of method of communication device initiated frame exchange is provided, comprising: the transceiver that starts communication equipment; The beginning uplink traffic frame wherein, receives described uplink traffic frame at access point to the transmission of access point; Determine whether to receive the significant response frame, wherein, described response frame sends from access point, and wherein, and described response frame comprises the downlink traffic that mails to described communication equipment and to receiving the affirmative acknowledgement of described uplink traffic frame; With when receiving the significant response frame from access point, the transceiver of stopping using.
Description of drawings
Fig. 1 is to use the schematic diagram of the prior art WLAN frame turnaround sequence of uncontested cut-in method.
Fig. 2 is to use the schematic diagram based on the prior art WLAN frame turnaround sequence of the cut-in method of competition.
Fig. 3 is the block diagram that can be used in the system of the method that realizes communication device initiated frame exchange of the present invention.
Fig. 4 is the schematic diagram according to the method for the communication device initiated frame exchange of first embodiment of the invention.
Fig. 5 is the schematic diagram that concerns between the method according to this invention embodiment, demonstration service intervals and the poll window.
Fig. 6 is the flow chart of method of the communication device initiated frame exchange of Fig. 4 of looking from the communication equipment angle.
Fig. 7 is the flow chart of method of the communication device initiated frame exchange of Fig. 4 of looking from the access point angle.
Fig. 8 is the schematic diagram according to the method for the communication device initiated frame exchange of second embodiment of the invention.
Fig. 9 is the flow chart of method of the communication device initiated frame exchange of Fig. 8 of looking from the communication equipment angle.
Figure 10 is the flow chart of method of the communication device initiated frame exchange of Fig. 8 of looking from the access point angle.
Embodiment
The first aspect of first embodiment of the invention provide a kind of in each service intervals the method for communication device initiated frame exchange, comprising: send polling message at least once in each service intervals, polling message request downlink traffic frame to access point; Receive the active downlink frame with determining whether from access point.The method that a kind of communication device initiated frame exchange is provided on the other hand of first embodiment of the invention comprises: receive polling message, polling message request communicating downlink traffic frame from communication equipment; With respond polling message by sending the downlink traffic frame to communication equipment.The second embodiment of the present invention provides a kind of method of communication device initiated frame exchange, comprising: start the communication equipment transceiver; Beginning transmit uplink traffic frame is to access point; Determine whether to receive the significant response frame; With when receiving the significant response frame, the transceiver of stopping using.
The present invention is a kind of improved technology, is used to insert the WLAN channel, and provides service quality (QoS) for the voice in the system of support voice and data, services.Under this technology, MT competes media (channel).In case win the access of competition and acquisition media, MT sends packets of voice to AP and poll AP latency services.Low-power realizes it being practicable because MT can dormancy, wake up and compete media, send packets of voice to AP, from AP request packets of voice, transmission affirmative acknowledgement and return dormancy.Although described first and second embodiment with reference to MT, the present invention can be used for any communication equipment that can communicate by letter with AP.
The WLAN design and the optimization of a current generation are used for best data, services.Recently, a kind of needs that provide effective transmission mode to be used for the synchronous service on the WLAN have appearred.Synchronous service refers to connection-oriented service, and it requires the cycle utilizability of channel width, thereby obtains required QoS, such as call voice and video conference.Although described embodiment of the present invention focuses on the periodicity transmission of packetizing voice from MT to AP and from AP to MT, it can be applicable to the two-way services based on any kind on the access network of competition.
Fig. 3 is the block diagram of system that is used to realize the method for communication device initiated frame exchange of the present invention.In order to support the call voice on the WLAN, AP 304 must can be with a plurality of MT 302,303 exchanges voice frames, as shown in Figure 3.The speech frame that MT 302,303 produced and mail to AP 304 is called as uplink service here.In addition, the speech frame that arrives and mail to MT 302,303 from network 306 (for example, based on from public switch telephone network (PSTN) 308) is referred to herein as downlink traffic.Under the present invention, MT 302,303 self is associated with contiguous AP 304, and with AP 304 exchanges voice frames.
In the present invention, the time of advent between the packets of voice is relevant with service intervals at interval.Specifically, service intervals is defined as the average arrival time interval between the speech frame (comprising up link or downlink traffic).Usually, just before the time of advent was divided into groups in expectation, every service intervals produced a speech frame for wireless station 302,303 in the network 306 or voice gateways.The expectation of speech frame N+1 grouping is the length that the expectation grouping of speech frame N adds service intervals the time of advent time of advent.Although because different disposal load or network delay, the actual time of arrival of grouping may be different, and it is constant that service intervals will keep, and based on the frame period at the speech coder of each end use of wireless calling.But expected approach time is unique among a plurality of MT each usually.
Referring now to Fig. 4,, shown frame turnaround sequence according to first embodiment of the invention.In case receive packetized voice traffic from more high-rise voice application, MT 302,303 wakes its transceiver up and the beginning competitive channel inserts.After winning the competition step and obtaining channel, MT302,303 sends uplink voice packet to AP 304.In identical step, MT 302,303 also sends polling message to AP 304, and request AP 304 sends downlink voice packet.304 pairs of uplink voice packet responses of AP are with affirmative acknowledgement, and the transmission downlink voice packet is to the MT 302,303 of request.In case successfully receive downlink voice packet, MT302,303 can come to carry out affirmative acknowledgement to receiving grouping by send positive acknowledgement message to AP 304.At last, MT 302,303 can close its transceiver module and begin dormancy, up to next packets of voice can with or up to arriving poll AP 304 when carrying out downlink traffic.
The present invention includes the method for poll AP 304, even when packets of voice is not to expect the grouping generation time of advent by more high-rise voice application.For example, the MT302 in the network 306,303 and voice gateways can during audio call, utilize to mourn in silence and suppress to reduce up link and downlink traffic.When inhibition was mourned in silence in use, MT 302,303, and for example, the place, end that stops at each talk pulse (talk spurt) produces grouping, and beginning begins to produce grouping once more at the place that begins of talk pulse newly.During silence period, when MT 302,303 did not produce packets of voice, uplink traffic pattern changed, because do not have packets of voice to trigger ul transmissions in the expectation class interval time.In this situation, the present invention utilizes the poll window to detect the transmission of service intervals in MT 302,303, and after this, MT 302,303 wakes its transceiver up and begins competitive channel and inserts, and recovers downlink traffic thereby only send polling message to AP 304.
In addition, the present invention uses the poll window to determine when MT 302,303 can compete the WLAN channel.The poll window is near the expectation grouping short interval time of advent, has time started TP WstartWith concluding time TP Wend, as shown in Figure 5.If packets of voice is at T by voice application PwstartProduce, the polling message with the entrained data of grouping is just at T before PwstartSend.On the other hand, any packets of voice that receives in the poll window all sends immediately with poll.At last, if in given service intervals, there is not speech frame to arrive, at the T of the place, end of poll window Pwend, only send polling message and recover downlink traffic to AP 304.
To use the example of IEEE 802.11WLAN to describe first and second embodiment of the present invention in more detail now.The whole steps of setting up the call voice calling can be divided into four-stage.Phase I betides MT 302,303 and at first starts shooting and search for AP 304, thereby related with it.Second stage has represented to exist incoming call and AP 304 needs to locate the incident that MT 302,303 sets up under the voice conversation situation.Initiate if audio call is MT 302,303, then this second stage is optional.Phase III is the situation of carrying out voice packet transfer.At last, the quadravalence section will be called out disconnection.The present invention focuses on second and the phase III.
For the audio call of network startup, AP 304 needs the location and transmits it and need be connected with the voice of MT 302,303 to set up.This communication is carried out in periodic beacon, and this beacon occurs with predetermined space.Because MT 302,303 needs periodic wakeup to answer beacon message, AP 304 can indicate MT 302,303 to have the incoming call audio call.Under the present invention, in order to set up audio call, wish to guarantee that the speech frame of up link and downlink traffic stream all is synchronized with each other, also be, network 306 and MT 302,303 create packets of voice in the roughly the same moment, and have common service intervals.
Fig. 6 has shown the flow chart of the frame turnaround sequence of the Fig. 4 that looks from the MT angle.This flow chart is illustrative, and does not mean that qualification.In case receive packets of voice (step 604) from voice application, MT 302,303 starts its transceiver (step 602) and begins the competitive channel access.For medium access control system (MAC) agreement based on competition, transceiver starts and the time between the competition won is depended on the load level of wireless network 305 (Fig. 3) usually.In case sense channel and win competition (that is, confirm transmission opportunity), MT 302,303 obtains channel by the uplink packet that sends nearest arrival, and in same steps as, poll AP 304 is to carry out downlink traffic (step 612).This step of confirming transmission opportunity is as long as need to send data or be polled to AP 304 and will repeat at MT 302,303.Because up link all should be available in the identical moment with downlink packets, AP 304 should receive this polling message T after MT302,303 starts its transceiver 1Second, T here 1Comprise slow startup (ramp up) transceiver, competitive channel, transmission grouping, propagate the time of dividing into groups and handling reception.Thereby network 306 also has T 1Provide downlink packets to AP 304 second, and its preparation is sent when AP 304 receives polling message.Up link and downlink packets creation-time also can be adjusted, thereby reflect the relative network congestion level between cable network 306 (Fig. 3) and the wireless network 305.
In step 614, MT 302,303 determines whether it receives valid frame from AP 304.If do not receive valid frame, MT 302,303 further checks and does not arrive maximum times of retransmitting and the maximum service life (step 626) that does not arrive this grouping.If these two tests have all been passed through, MT 302,303 retransmits the data (step 612) that before sent with polling message.On the other hand,, just abandon grouping (step 628), MT 302,303 inactive its transceivers (step 620) if test is not passed through.Get back to step 614, when receiving valid frame, MT 302,303 determines whether frame comprises downlink traffic (step 616).When frame comprised downlink traffic, MT 302,303 sent the affirmative acknowledgement (step 618) that receives frame and its transceiver (step 620) of stopping using.When frame does not comprise downlink traffic, MT 302,303 just inactive its transceivers (step 620), method finishes.
Get back to step 604, when MT 302,303 does not have data to send, its determine whether be send polling message to AP 304 to have carried out time the downlink traffic (step 606).If answer is a "Yes", because arrived the end of poll window, MT 302,303 starts its transceiver (step 622) and sends polling message (step 608).Then, MT 302,303 waits for from AP 304 and receives response.Describe in detail with reference to figure 7 as the back, when AP 304 had the downlink packets that is ready to send, AP 304 came responding from MT302,303 polling message by sending grouping.In addition, it also responds the uplink service grouping by sending positive acknowledgement message to the MT 302,303 that asks.In step 610, MT 302,303 determines whether to have received valid frame from AP 304.If do not receive valid frame, MT302,303 conflicts and avoids and compensation process, as known to those skilled in the art, and prepares to retransmit poll.Retransmit decision and depend on two factors, whether reached maximum times of retransmitting and the maximum service life (step 624) that whether has reached this poll.If two tests have all been passed through, the step 608 that turns back to of MT 302,303 is retransmitted poll.On the other hand,, just end poll and attempt, MT 302,303 inactive its transceivers (step 620) if two tests are not all passed through.Return step 610, when receiving valid frame, MT 302,303 determines whether frame comprises downlink traffic (step 630).When frame does not comprise downlink traffic, MT 302,303 inactive its transceivers (step 620), method finishes.When frame comprised downlink traffic, MT 302,303 sent receiving the affirmative acknowledgement (step 631) of frame.Next, in step 620, MT 302,303 its transceivers of stopping using, dormancy is until it's time to send another polling message or receiving the business that sends to AP 304 from higher layer applications more up to it.By the timing of control with the exchange of the frame of AP 304, MT 302,303 can dormancy between craticular stage, has increased MT standby battery time thus.
Fig. 7 has shown the flow chart of method of the communication device initiated frame exchange of the Fig. 4 that looks from the AP angle.For AP 304, method starts from AP and receives frame (step 702) from MT 302,303.Next, whether effectively AP 304 determines frame (step 703).When frame was invalid, method finished.When frame was effective, AP 304 determined whether to mail to the downlink traffic (step 706) of MT 302,303.When downlink traffic that AP 304 will not send, it comes to carry out affirmative acknowledgement (step 708) to receiving uplink frame by sending affirmative acknowledgements to MT 302,303, and method finishes then.Uplink frame can be poll frame (step 608 of Fig. 6 sends), or has the data (step 612 of Fig. 6 sends) of poll frame.When AP 304 has downlink traffic to send, its send downlink traffic and to the affirmative acknowledgement that receives uplink frame to MT 302,303 (step 710), wait for then from MT 302,303 to receiving the affirmative acknowledgement of downlink packets.In step 712, AP 304 determines whether it receives affirmative acknowledgement.If AP 304 does not receive affirmative acknowledgement (in the past after the appropriate time amount), its buffered data is with repeating transmission (step 714) in next time that receives polling message at it from MT 302,303, and the frame turnaround sequence finishes.The frame turnaround sequence also finishes when AP 304 receives affirmative acknowledgement.
Fig. 8 has shown second embodiment of method of the present invention.Be similar to the frame turnaround sequence of first embodiment, in case receive packetized traffic from upper-layer protocol more, MT 302,303 starts its transceivers and also begins competitive channel and insert.In case win competition, MT 302,303 obtains channel (that is, affirmation transmission opportunity) by sending uplink voice packet to AP 304.Do not send the downlink voice packet (as shown in Figure 4) of loading affirmative acknowledgement, AP 304 transfers to respond uplink voice packet by sending positive acknowledgement message, and this meets existing 802.11 standards.In case receive positive acknowledgement message from AP 304, MT 302,303 poll AP 304 are to carry out downlink voice packet.At last, MT 302,303 is by sending positive acknowledgement message to AP 304, carry out affirmative acknowledgement and come the abort frame turnaround sequence receiving the active downlink packets of voice.After finishing the frame turnaround sequence, MT 302,303 can close its transceiver module and begin dormancy, can be used for transmission up to next grouping.Compare with frame turnaround sequence shown in Figure 4, second embodiment is owing to the sequential nature of the transmission of up link and downlink packets is lost some efficient.
The flow chart of method that has shown the communication device initiated frame exchange of the Fig. 8 that looks from the MT angle among Fig. 9.In case receive packets of voice (step 904) from more senior application, MT 302,303 starts its transceiver (step 902), and the beginning competitive channel inserts.For medium access control system (MAC) agreement based on competition, transceiver starts and the time between the competition won is depended on the load level of wireless network 305 usually.In case win competition, MT 302,303 obtains channel by sending uplink traffic frame (step 906) to AP 304.If MT 302,303 does not receive affirmative acknowledgement (step 908), it prepares the retransmission data frame.Retransmit decision and depend on two factors, whether reach maximum number of retransmissions and whether reach the maximum service life (step 926) of poll.If two tests are all passed through, MT 302,303 turns back to step 906 and retransmits this frame.On the other hand,, will abandon Frame (step 928), MT 302,303 its transceiver (step 918) of will stopping using if two tests are not passed through.Get back to step 908, when MT 302,303 received affirmative acknowledgement, its poll AP 304 was to carry out downlink traffic (step 912) and to wait for the 304 reception responses from AP.In step 914, MT 302,303 determines whether it receives valid frame from AP 304.If received invalid frame, it prepares poll AP 304 again.Again two factors are depended in the decision of poll, whether reach maximum attempts and whether reach the maximum service life (step 924) of this poll.If two tests are all passed through, MT 302,303 gets back to step 912 and retransmits this poll.On the other hand,, will end poll, MT 302,303 its transceiver (step 918) of will stopping using if two tests are not passed through.In step 914, when when AP 304 receives valid frame, MT 302,303 further checks in the frame that receives whether comprise the downlink traffic frame in step 930.If frame comprises downlink traffic, MT 302,303 sends AP 304 (step 916) is arrived in the affirmative acknowledgement that receives frame.In step 918, MT 302,303 inactive its transceivers, dormancy has business or poll to send up to it.If frame does not comprise downlink traffic, inactive immediately its transceiver of MT and dormancy have business or poll will send (step 918) up to it.
Get back to step 904, when MT 302,303 does not have data to send, its determine whether be send periodic polls message to AP 304 to have carried out time the downlink traffic (step 910).If answer is a "Yes", because arrived the end of poll window, MT 302,303 starts its transceiver (step 920), and method is equally carried out in step 912 as described above.If also do not reach when sending poll, MT 302,303 keeps " dormancy " patterns, has more multidata to send or up to arriving poll AP 304 when carrying out downlink traffic up to it.
Figure 10 has shown the flow chart of method of the communication device initiated frame exchange of the Fig. 8 that looks from the AP angle.For AP 304, method starts from AP 304 and receives frame (step 1002) from MT 302,303.Next, whether effectively AP 304 determines frame (step 1004).When frame was invalid, method finished.When frame was effective, AP 304 determined whether frame comprises the poll (step 1006) to downlink traffic.When frame comprised poll to downlink traffic, AP 304 determined whether they have business will send (step 1008).When not having downlink traffic to send, AP 304 sends MT (step 1014) is arrived in the affirmative acknowledgement that receives poll frame, and method finishes.When downlink traffic will send, AP 304 sent traffic to MT 302,303 (step 1010) and waits for receiving the affirmative acknowledgement from the downlink traffic of MT 302,303.In step 1012, AP 304 determines whether it receives affirmative acknowledgement.If AP 304 receives affirmative acknowledgement, method finishes.If AP 304 does not receive affirmative acknowledgement (after through the appropriate time amount), its buffered data is used for retransmitting (step 1016) in its next time that receives polling message from MT 302,303, and the frame turnaround sequence finishes.When the frame that receives in step 1002 comprised uplink service (in the "No" path of step 1006), AP 304 sent MT (step 1014) is arrived in the affirmative acknowledgement that receives uplink service, and method finishes.
The present invention makes communication equipment can start frame turnaround sequence with AP, rather than waits for poll or speech frame from AP as the prior art suggestion.Therefore, AP must be full-time watchful to wait for startup.This is acceptable, because AP does not rely on battery electric power usually.As a result, communication equipment needn't be leaveed no choice but keep waking up, has reduced its power consumption thus.In addition, the invention enables each equipment to wake up with the service intervals of rule, this is totally independent of the beacon interval of AP and the service intervals of other equipment.This allows mixing of station and dissimilar synchronous services, thereby occupies channel and beacon is regularly complicated, and allows AP with than the much lower frequency transmission beacon of service intervals such as the business of voice simultaneously.And then, up link and downlink packet transfer cause higher efficient and lower competition synchronously.
The present invention is easy to carry out various modifications and shows as other form, and the mode that just exemplifies with accompanying drawing is described in detail and shown certain embodiments here.But, should be appreciated that, the invention is not restricted to particular form disclosed herein.The present invention is contained all and is fallen into interior modification, equivalence and the replacement of the scope of the invention that claims limit.

Claims (10)

  1. One kind in each service intervals, the method for communication device initiated frame exchange comprises:
    Start the transceiver of communication equipment;
    Every service intervals sends a polling message at least to access point, described polling message request downlink traffic frame, and wherein, receive described polling message at access point;
    Determine whether to receive the active downlink frame, wherein, described descending chain circuit frame sends from access point, and wherein, and described downlink traffic frame comprises the downlink traffic that mails to described communication equipment and to receiving the affirmative acknowledgement of described polling message; And
    Inactive transceiver.
  2. 2. the method for claim 1, wherein when receiving the active downlink frame, method comprises and sends affirmative acknowledgement to access point.
  3. 3. method as claimed in claim 2 comprises:
    After sending affirmative acknowledgement, the transceiver of stopping using.
  4. 4. the method for claim 1, wherein when not receiving the active downlink frame, method comprises:
    When determining whether to be another polling message of transmission; With
    In the time of when also being less than another polling message of transmission, the transceiver of stopping using.
  5. 5. the method for claim 1, wherein sending polling message comprises to the step of access point and sends polling message and uplink service.
  6. 6. method as claimed in claim 5, wherein, when not receiving the active downlink frame, method comprises and resends uplink service and polling message.
  7. 7. method as claimed in claim 5, wherein, when receiving the active downlink frame, method comprises:
    Determine that this frame comprises business;
    Transmission is to receiving professional affirmative acknowledgement to access point; With
    The transceiver of inactive communication equipment.
  8. 8. the method for claim 1, wherein described access point wait for from communication equipment to receiving the affirmative acknowledgement of downlink traffic frame; And
    When not receiving described affirmative acknowledgement, described access point buffering downlink traffic frame is to resend to communication equipment.
  9. 9. the method for a communication device initiated frame exchange comprises:
    Start the transceiver of communication equipment;
    The beginning uplink traffic frame wherein, receives described uplink traffic frame at access point to the transmission of access point;
    Determine whether to receive the significant response frame, wherein, described response frame sends from access point, and wherein, and described response frame comprises the downlink traffic that mails to described communication equipment and to receiving the affirmative acknowledgement of described uplink traffic frame; With
    When receiving the significant response frame from access point, the transceiver of stopping using.
  10. 10. method as claimed in claim 9, wherein, when not receiving the significant response frame, method comprises that resending uplink traffic frame arrives access point.
CN200380102024A 2002-10-25 2003-10-22 Method of communication device initiated frame exchange Expired - Fee Related CN100588295C (en)

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GB2508608B (en) * 2012-12-04 2015-06-10 Broadcom Corp Data delivery
US9998209B2 (en) * 2013-08-31 2018-06-12 Qualcomm Incorporated Speed frame exchange rules
CN106506697A (en) * 2016-12-23 2017-03-15 上海斐讯数据通信技术有限公司 A kind of management method of distributed wireless access device system and system

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