Proposed Modification for IEEE 802.11-17 Short SSW Packet Signaling
In January 2017, a proposal was made to address the signaling issues related to the Short SSW packet in IEEE 802.11-17 standard. The existing SSW-Feedback and SSW-ACK frames were found insufficient to indicate all cases of sectors in the Short SSW packet, requiring modifications to ensure complete signaling. The proposal suggests utilizing reserved bits in the SSW-Feedback frame to convey additional information for accurate sector indication.
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January 2017 doc.: IEEE 802.11-17/0109r0 SSW-Feedback & SSW-ACK for Short SSW packet Date: 2017-01-18 Authors: Name Affiliations Address Phone email SungJin Park LG Electronics Seocho LG allean.park@lge.com R&D Lab, Korea Kyungtae Jo LG Electronics kyungtae.jo@lge.com JinMin Kim LG Electronics jinmin1230.kim@lge.com HanGyu Cho LG Electronics hg.cho@lge.com Saehee Bang LG Electronics saehee.bang@lge.com Jinsoo Choi LG Electronics js.choi@lge.com Sanggook Kim LG Electronics San Diego sanggook.kim@lge.com /California/ US Slide 1 LG
January 2017 doc.: IEEE 802.11-17/0109r0 Introduction In the current SFD, Short SSW packet can be transmitted as part of an I-TXSS and R- TXSS during DTI. However, existing 11ad SSW-Feedback frame and SSW-ACK frame cannot indicate all cases of sectors which are indicated by Short SSW packet. In this contribution, we propose the modification of existing SSW-Feedback frame and SSW-ACK-frame when Short SSW packet is used. Not defined Slide 2 LG
January 2017 doc.: IEEE 802.11-17/0109r0 Problems of signaling If the existing 11ad SSW-Feedback frame and SSW-ACK frame are used for Feedback and ACK for Short SSW packet, the number of bits (Sector Select & DMG Antenna Select) is not enough to indicate full cases of CDOWN field and RF Chain ID. The number of bits for CDOWN field within Short SSW packet is 11 bits. The number of bits for existing Sector Select field is only 6 bits. Slide 3 LG
January 2017 doc.: IEEE 802.11-17/0109r0 Proposed SSW-Feedback frame & SSW-ACK frame Reserved bits of SSW Feedback field can be used in order to signal insufficient bits. Feedback for SSW frame (Proposal) Feedback for Short SSW packet CDOWN Select 1 & CDOWN Select 2 fields: the combination of these fields indicate full cases of CDOWN indicated by Short SSW packet. RF Chain Select: this field indicates the RF Chain ID which is used by Short SSW packet. Slide 4 LG
January 2017 doc.: IEEE 802.11-17/0109r0 Conclusion It is a problem that full cases of sector which can be indicated by SSW-Feedback frame and SSW-ACK frame are mismatched with Short SSW packet. In this contribution, we propose SSW-Feedback frame and Short SSW-ACK frame to complete SLS if Short SSW packet is used during ISS and RSS. Slide 5 LG
January 2017 doc.: IEEE 802.11-17/0109r0 SP & Motion #1 Do you agree to add the following text to the SFD: If the Short SSW packet is transmitted during ISS and RSS and then SSW-Feedback frame and SSW-ACK frame are transmitted, SSW Feedback field within SSW- Feedback frame and SSW-ACK frame is interpreted as the figure in slide 3. - Sector Select subfield (6bits) is interpreted as CDOWN Select 1 subfield (6bits). - DMG Antenna Select subfield (2bits) is interpreted as RF Chain Select subfield (2bits). - Reserved bits (5bits) are interpreted as CDOWN Select 2 subfield (5bits). Slide 6 LG
