Improving Robustness of Intermediate FCS in IEEE 802.11-0828r0
Enhance the robustness of the Intermediate FCS by addressing miss detection issues when error bits are present, through methods like using odd or even numbers, different special AID12 values, and additional indication fields. These strategies aim to improve the reliability of the I-FCS in case only one of the two I-FCS User Info fields is detected in the IEEE 802.11-0828r0 document dated May 2025.
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May 2025 doc.: IEEE 802.11-0828r0 Improve the Robustness of Intermediate FCS Date: 2025-05-08 Authors: Name Affiliation Address Phone Email Ning Gao gaoning1@oppo.com Chaoming Luo Liuming Lu OPPO Weijie Xu Liangxiao Xin Huixuan Zhou Submission Slide 1 Ning Gao (OPPO)
May 2025 doc.: IEEE 802.11-0828r0 Introduction An intermediate FCS (I-FCS) within an ICF was proposed in [1] to trigger DPS STAs to switch their capability mode before the end of the ICF. [2] proposed to use two contiguous User Info fields, known as I-FCS User Info fields, to form an I-FCS and the two I-FCS User Info fields are identified by a same special AID12 value. However, due to the non-fixed location, the I-FCS is still facing a high miss detection probability issue if there are error bits in the AID12 field. [3] To be specific, the entire I-FCS could be invalid if at least one of the two I- FCS User Info fields is not detected. Because the receiver can not distinguish the detected single I-FCS User Info field is the first one or the second one. So the receiver can not get all the 32 bits I-FCS. In this contribution, some methods are provided to improve the robustness of the I-FCS in case of only one I-FCS User Info field is detected. Submission Slide 2 Ning Gao (OPPO)
May 2025 doc.: IEEE 802.11-0828r0 Proposed Methods Idea: if a DPS STA can distinguish the detected single I-FCS User Info field is the first one or the second one. Then, it can recover the other one I-FCS User Info field. If the first one is detected, then the following 5 octets is the second one. If the second one is detected, then the preceding 5 octets is the first one. Three methods are provided here to distinguish I-FCS User Info fields: Option 1: odd or even number The first I-FCS User Info field is always an odd-numbered User Info field in the User Info List while the second I-FCS User Info field is always an even-numbered User Info field in the User Info List, vice versa. A dummy User Info field can be inserted before the I-FCS to achieve this. Sequence: 2n-1, n=1,2,3,... Sequence: 2n, n=1,2,3,... I-FCS User Info field A I-FCS User Info field B Octets: 5 5 Submission Slide 3 Ning Gao (OPPO)
May 2025 doc.: IEEE 802.11-0828r0 Proposed Methods Option 2: different special AID12 values The first I-FCS User Info field and the second I-FCS User Info field are identified with different special AID12 values (e.g., 2011 and 2012). I-FCS User Info field A I-FCS User Info field B Octets: 5 5 B0 B11 B12 B15 B16 B23 B0 B11 B12 B15 B16 B39 B24 B39 AID12 (=2011) AID12 (=2012) Reserved IFCS Part 1 Reserved IFCS Part 2 Reserved Bits: 12 4 24 Bits: 12 4 8 16 Option 3: additional indication field A field within each I-FCS User Info field indicates whether it is the first one or the second one. I-FCS User Info field A I-FCS User Info field B Octets: 5 5 B14 B39 B15 B15 B16 B0 B11 B12 B23 B0 B11 B12 B16 B14 B24 B39 AID12 (=2011) First I-FCS (=1) AID12 (=2011) First I-FCS (=0) Reserved IFCS Part 1 Reserved IFCS Part 2 Reserved Bits: 12 3 1 24 Bits: 12 3 1 8 16 Submission Slide 4 Ning Gao (OPPO)
May 2025 doc.: IEEE 802.11-0828r0 Summary Three methods are provided in this contribution to improve the robustness of the I-FCS in case of only one of the two I-FCS User Info fields is detected: Use odd or even number Use different special AID12 values Use additional indication field When a DPS STA can distinguish the detected single I-FCS User Info field is the first one or the second one. Then, it can recover the other one I-FCS User Info field. Submission Slide 5 Ning Gao (OPPO)
May 2025 doc.: IEEE 802.11-0828r0 Reference [1] 11-24-1227-00-00bn-some-usage-of-intermediate-fcs [2] 11-25-0144-01-00bn-ifcs-pn-and-mic-inclusion-in-a-trigger-frame [3] 11-24-1702-00-00bn-consideration-on-the-signalling-method-of-intermediate- fcs Submission Slide 6 Ning Gao (OPPO)
May 2025 doc.: IEEE 802.11-0828r0 SP 1 Which method do you prefer to improve the robustness of the I-FCS in case of only one of the two I-FCS User Info fields is detected: Option 1: Use odd or even number Option 2: Use different special AID12 values Option 3: Use additional indication field Option 1/Option 2/Option 3/Abstain Submission Slide 7 Ning Gao (OPPO)
