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Discussion of WUR Packets Design
Ke Yao, et, al. (ZTE)
Slide1
Date:2016-11-07
Authors:
Background
WUR, as an add-on module to WLAN device, is considered to be a high efficient power saving method due to its ultra low power consumption.WUR PAR and CSD have been submitted to IEEE 802 EC for approval.PAR mentioned that wake up packets carry control information.The content of WUR packet is discussed in thisproposal.
Slide2
Ke Yao, et, al. (ZTE)
Principles of WUR Packet Design
In order to achieve cost efficient while maintaining low power consumption level:Transmission of WUR packets should be as less as possibleOnly part of WUR module needs to monitor WUR channel at all timeOnly when needed, the full WUR module will be triggeredLogic of the WUR RX module should be as simple as possibleLess WUR packet type to simplify receiving parser.Simple structure of each WUR packet typeNext slides provide some considerations on the WUR packet design.
Slide3
Ke Yao, et, al. (ZTE)
Functionality of WUR Packet
To wake up WUR STAwake up packet is neededthe primary requirement on WUR channelTo keep WUR link connection aliveThe packet which can be seen as heart-beating is neededWUR STA can stay in deep sleep mode for a very long time without worry about abnormal situation, such as AP’s WU message is unreachable.To keep time alignment between AP and STA in WUR on/off modeTime information should be carried in certain WUR packetsLong time in deep sleep mode may cause timing synchronization inaccurate.
Slide4
Ke Yao, et, al. (ZTE)
Wake Up Packet
Wake up packet should contain the following contents:Must to haveRx ID and Tx ID to uniquely identify the receiverBest to have1 bit indication of DL/UL to support imbalanced length of Tx/Rx IDAP and non-AP STA may have different length of IdentifierWake up auxillary information to support various operations after or during wake-up, such asthe predefined information which should be fedback after wake upTarget main module primary channel info to avoid scanning, for paging packet
Slide5
Ke Yao, et, al. (ZTE)
Wake up auxiliary information
The predefined information can be used toIndicate the receiver to feedback certain information, such asMeasurement of temperature, humidity, density of gas, speed of wind,… in sensor use casesLocation informationPower level/ battery remaining lifetimeIndicate the receiver to do some predetermined type of operation, then feedback the statusFor remote control, smart home, smart industry, smart traffic, smart agricultureIndicate the receiver to access the networkThe predefined information could be application dependent
Slide6
Ke Yao, et, al. (ZTE)
Heart Beating packet
Heart beating packet should at least contain:RxID and TxID (AP)Ordinary wake up packets can be seen as heart beating packet for the third party receiver
Slide7
Ke Yao, et, al. (ZTE)
Packet for timing alignment
Packet for timing alignmentcontains:RxID: Broadcast IDTxID: APTiming infoMainly for on/off mode WUR, also helps always-on WUR to adjust time
Slide8
Ke Yao, et, al. (ZTE)
Conclusion
Discussed what kind of packets should be supported on WUR channelWUR packet to wake up receiverWUR packet to keep WUR link connection aliveWUR packet to keep time alignmentProvided considerations on the content of these packets for further WUR message design.
Slide9
Ke Yao, et, al. (ZTE)
References
[1] 11-16-1045-06-0wur-a-par-proposal-wur-sg
Slide10
Ke Yao, et, al. (ZTE)

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Presentation TGaj(11aj)