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Resolution to TGaj Draft 0.01 CID 146

Resolution to TGaj Draft 0.01 CID 146. Date: 20 14-5-20. Presenter:. Author List. Abstract.

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Resolution to TGaj Draft 0.01 CID 146

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  1. Resolution to TGaj Draft 0.01 CID 146 Date: 2014-5-20 Presenter: Dejian Li

  2. Author List Dejian Li

  3. Abstract • This is a submission for comment resolution on D0.01 for comment #146. This submission provides an SP Dynamic Truncation mechanism for 11aj to satisfy the channel access requirements the STAs more accurately, increase sleep chances for the PCP and avoid interference to other existing SPs during spatial sharing. Dejian Li

  4. Background: SP dynamic truncation in 11ad • To support variable bit rate traffic, a STA can truncate an SP or extend an SP dynamically. • In 802.11ad, there are two types of SP truncation (see 9.33.8): • The STA returns the time left in the SP to the PCP/AP, thus allowing the PCP/AP to grant the released time to any other STA as an SP or a CBAP. • The STA can allocate any portion of its SP as a CBAP directly. • The PCP Active field is defined to indicate that whether the PCP is active in a CBAP or an SP. • The PCP Active field is set to 1 if at least one of the Truncatable or Extendable fields are set to 1, or when transmitted by an AP. Dejian Li

  5. Problems of the 11ad SP truncation(1/2) • Only the PCP/AP knows which allocation type (a CBAP or an SP) is the most required at a specific truncatable SP. • The remaining SP time should be allocated in accordance with the channel access requirements of the BSS. • For example, if there is a large number of video streaming in the BSS, many remaining SPs may be reallocated as SP to meet the requirements of Variant Bit Rate; otherwise, the remaining SP might be released as a CBAP by the STA. • Using the overall channel access requirements of the BSS, the PCP/AP can work out a complete schedule scheme that includes the reallocation scheme of the potential remaining SP. • As a portion of the schedule scheme, the allocation type of the remaining SP should also be determined by the PCP/AP. Dejian Li

  6. Problems of the 11ad SP truncation(2/2) • According to 11ad, the PCP can not save power during a truncatable SP, because it should be awake in all the truncatable SPs. • In order to save power, the PCP should be able to sleep in the truncatable SPs during which the remaining time should be released as a CBAP. • The PCP Active subfield can be used to indicate the PCP is unavailable during the whole truncatable SP, but the STAs can still utilize the remaining SP that is released as a CBAP without the PCP. • Releasing the remaining SP as a CBAP by STA might lead to interference to some existing SPs during spatial sharing. • Although the STA can identify whether its SP is overlapping with another SP by using the Extended Schedule element, but the identification procedure is very complex if there are a lot of SPs. Dejian Li

  7. Resolution of the SP dynamic truncation • Add Truncation Type field using one reserved bit (B12) in Allocation Control field to indicate the truncation type of the SP. • If the Truncatable field is set to 1 and the Truncation Type field is set to 0, the STA shall return the remaining time of SP to the PCP/AP for dynamic SP allocation. If the Truncatable field is set to 1 and the Truncation Type field is set to 1, the STA shall release the remaining time of SP as CBAP directly. • If the Truncatable field is set to 0, then the Truncation Type field is reserved. • PCP Active field • The PCP Active field is set to 1 if the Truncatable field is set to 1 and the Truncation Type field is set to 0. • The PCP Active field is set to 1 if the Extendable field is set to 1 or when transmitted by an AP. • In all other cases, the PCP Active field can be set to 0. Dejian Li

  8. Benefits of the Improved SP Truncation • Satisfy the service requirement of STAs more accurately • By using the service requirement of the BSS and by controlling the SP truncation type, the PCP/AP can work out a more complete schedule scheme to reallocate the remaining SP time as a CBAP or an SP. • Increase the sleep chances for the PCP • If the Truncation Type field indicates that the STA should release the remaining SP as a CBAP by itself, the PCP can sleep during the whole SP to save power. • Avoid interference to some existing SPs during spatial sharing • The 1-bit Truncation Type field can indicate the STAs not to release the remaining SP as a CBAP, thus reducing the procedure that the STA checks whether its SPs are time-overlapping with other SPs. Dejian Li

  9. Summary • This submission provides solution for comment #146 on the comment resolution for D0.01. • The SP truncation type is determined by PCP/AP by adding Truncation Type field in Allocation Control field. • Modification to 802.11ad: • Add Truncation Type field (1-bit ) in the Allocation Control field; • Modify the setting rules of the PCP Active field. Dejian Li

  10. Reference • In the IEEE P802.11ad TM -2012 Standard “Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications – Amendment 3: Enhancements for Very High Throughput in the 60 GHz band,” December 2012. Dejian Li

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