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Resolution to TGaj Draft 0.01 CID 146. Date: 20 14-3-17. Presenter:. Author List. Abstract.
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Resolution to TGaj Draft 0.01 CID 146 Date: 2014-3-17 Presenter: Dejian Li
Author List Dejian Li
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 improve spatial sharing and increase sleep chances in SP for PCP. Dejian Li
Background: SP dynamic truncation in 11ad • To support variable bit rate traffic, the STA can truncate SP or extend SP dynamically. • In 802.11ad, there are two types of SP truncation [1]: • The STA can truncate the SP and return to the PCP/AP the time left in the SP, thus allowing the PCP/AP to grant the released time to any other STA. • The STA can allocate any portion of its SP as a CBAP directly. • The Allocation Control field of Extended Schedule element comprises all the SP attributions, such as truncatable or extendable. Dejian Li
Problems of the 11ad SP truncation • Releasing the remaining time in the SP as a CBAP by STA might lead to interference to some existing SPs. • An STA neither has the overall interference information of the BSS, nor the schedule information of the neighbor BSS that PCP/AP obtained by clustering mechanism. • A PCP that is battery powered can not save power during a truncatable SP according to 11ad. • The PCP should be awake in all truncatable SPs because the STA may releasing the remaining time in the SP to the PCP. • Making sure the two types of SP truncation can be controlled by PCP/AP is a solution for the two above problems. Dejian Li
Resolution of the SP dynamic truncation • Add Truncation Type field using a 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 releases 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 releases 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 • If the Extendable field is set to 1, then the PCP Active field is set to 1. • If the Extendable field is set to 0, Truncatable field is set 1 and Truncation Type is set to 0, PCP Active field is set to 1. • In all other cases, PCP Active can be set to 0. Dejian Li
Benefits of the Improved SP Truncation • Increase the sleep chances for a PCP • If the Truncation Type field is set to 1 to allow the STA to release the remaining SP as a CBAP by itself, then the PCP can sleep during the whole SP to save power. • For example, if the allocated SP1 is not time-overlapping with other SPs, and all SP requirements of STAs are meet during ATI, then PCP can set the Truncation Type field to 1. • Improve the spatial sharing • Scenario: SP1 is time overlapping with SP2, STA5 and STA6 still have unsatisfied SP requirement. • If the PCP/AP finds that the directional communication between STA5 and STA 6 does not interfere SP2, then PCP/AP can set the Truncatable and Truncation Type fields to 1 and 0 respectively, indicating the remaining SP should be allocated by PCP/AP. If STA1 and STA2 truncate SP1 and release the remaining time to PCP/AP, then the PCP/AP can allocate the remaining SP1 to STA5 and STA6 dynamically. Dejian Li
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. • The determination of SP truncation type made by PCP/AP can mitigate interference that introduced by SP truncation. • PCP can sleep in some truncatable SPs, which helps to save power. • Modification to 802.11ad: • Add Truncation Type field (1-bit ) in the Allocation Control field; • Modify the setting method of the PCP Active field. Dejian Li
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