IEEE 802.11-14/1193r1 Polling Frame Format Overview
This document discusses the Polling Frame Format within the IEEE 802.11-14/1193r1 standard, focusing on the challenges, design proposals, and options for handling responses from polled devices. It covers different proposals such as BSRP, NFRP, and the use of CTS to Self for poll responses, highlighting their benefits and drawbacks in meeting the specified constraints. The goal is to enable dynamic rate adjustments for devices based on changing network conditions, movements, power saving requirements, and more.
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July 2018 doc.: IEEE 802.11-14/1193r1 HEz Polling Frame Format Date: 2018-07-08 Authors: Name Dibakar Das Affiliations Address Intel Phone email Dibakar.das@intel.com Chittabrata.ghosh@intel.c om Chittabrata Ghosh Jonathan Segev Intel Jonathan.segev@intel.co m Feng1.jiang@intel.com Intel Feng Jiang Intel 2111 NE 25th Ave, Hillsboro, OR 97124 Ganesh.venkatesan@intel. com Ganesh Venkatesan Intel Submission Slide 1 Dibakar Das, Intel
July 2018 doc.: IEEE 802.11-14/1193r1 Introduction The polling is the first stage in every HEz Txop measurement sequence. It allow for ISTAs which established a session to dynamically change their measurement rate based (for example) on changing channel conditions, their movement, power save etc. Submission Slide 2 Dibakar Das, Intel
July 2018 doc.: IEEE 802.11-14/1193r1 Challenges The design of polling TF and response needs to satisfy the following constraints: Allow for sufficiently large number of ISTAs to be polled. Allow RSTA to derive a TF Location Sounding allocating sounding resources to the subset of responding ISTAs (with SIFS time). Support for both associated and unassociated ISTAs. In this presentation we propose a design for Polling TF satisfying the above constraints. Submission Slide 3 Dibakar Das, Intel
July 2018 doc.: IEEE 802.11-14/1193r1 Frame format for Polling TF Previous Proposals Option 1 (BSRP): use QoS NULL frames as Poll response. MAC Overhead: 34 bytes. Benefit: implementation simplicity. Con: Objections/comments from reviewers/rest of 802.11 group on the use of data frames by unassociated ISTAs, supports fewer ISTAs than Option 2. Submission Slide 4 Dibakar Das, Intel
July 2018 doc.: IEEE 802.11-14/1193r1 Frame format for Polling TF Previous Proposals Option 2 (NFRP): use Short NDP feedback. MAC overhead: 0 bytes. Benefit: can poll larger number of ISTAs simultaneously, shorter medium time (no MAC), shorter processing time (no decoding needed). Con: 11ax Rel 2.0 feature set is unknown at this time. Submission Slide 5 Dibakar Das, Intel
July 2018 doc.: IEEE 802.11-14/1193r1 Frame format for Polling TF(contd.) Option 3: use CTS to Self as Poll response. RSTA identifies the responder from the RA field of the CTS frame. Allow CTS to be sent by unassociated STA. Duration field is Reserved. ISTAs use MAC padding/ packet extension to provide sufficient time for the RSTA to decode the Poll response. MAC Overhead: 14 bytes. Benefit: satisfy constraints in slide 1. Con: supports fewer ISTAs than Option 2. Prefer Option 3. Submission Slide 6 Dibakar Das, Intel
July 2018 doc.: IEEE 802.11-14/1193r1 Polling TF format based on Option 3 If a CTS frame is used as Poll Response, the Polling TF can be based on the 11ax Basic Trigger frame with the following changes/constraints: The Trigger Dependent User Info field is absent because the response is not a MU-PPDU nor is a Data frame. Allocation is based on reception of a valid MAC header. The Trigger Dependent Common Info field and its values are adopted from [11az Trigger Frame draft]. Submission Slide 7 Dibakar Das, Intel
July 2018 doc.: IEEE 802.11-14/1193r1 Summary Proposed usage of CTS as HEz Poll response to satisfy HEz Poll frame design constraints. Submission Slide 8 Dibakar Das, Intel
July 2018 doc.: IEEE 802.11-14/1193r1 References Jonathan Segev etal, 802.11az Trigger Frame Format , March 2018. Submission Slide 9 Dibakar Das, Intel
July 2018 doc.: IEEE 802.11-14/1193r1 Straw Poll 1 Do you support that the Poll response frame for HEz ranging shall be a CTS frame ? Yes: No: Abstain: Submission Slide 10 Dibakar Das, Intel
July 2018 doc.: IEEE 802.11-14/1193r1 Straw Poll 2 Do you support that the Location Trigger frame subtype HEz Poll shall have the following constraints? : 1. No Trigger Dependent User Info field 2. OFDMA is the mandatory mode. Note: Support for UL MU MIMO and/or mixed mode (UL MU MIMO and OFDMA concurrently) capabilities is exchanged during the 11az negotiation; and modes beyond ODFMA only can be supported if both ends are capable. Submission Slide 11 Dibakar Das, Intel
