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Clarification and Discussion on FILS Request Parameters: Insights from 802.11ai Draft

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mitch
10 diapositives · 208 Views · Jul 31, 2014

This presentation by Jarkko Kneckt from Nokia explores clarification questions related to FILS Request Parameters, essential for Probe Request frames and their criteria for Probe Response transmission. It discusses field definitions, estimation of transmission resource requirements, and the impact of HT and VHT capabilities on response times. The straw polls highlight preferences between transmission specification options, while addressing concerns such as access delay granularity and minimum data rates for effective data transmission. Insights aim to foster clearer definitions and standards in wireless communication protocols.

#clarification and discussion on fils request parameters: insights from 802.11ai draft #clarification and discussion on fils request parameters: insights from 802.11ai draft ppt #powerpoint #presentation
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Clarification and Discussion on FILS Request Parameters: Insights from 802.11ai Draft
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  1. Discussion of the comments related to FILS Request Parameter Authors: • Date:2013-09-16 Jarkko Kneckt (Nokia)

  2. Abstract • The presentation contains a set of clarification questions for FILS Request Parameters. FILS Request Parameters is transmitted in Probe Request frame and it sets criteria to Probe Response transmission. • The discussion is related to definitions and the formats of the fields. Jarkko Kneckt (Nokia)

  3. 8.4.2.177 FILS Request Parameters element • CIDs 2763, 3129, 3130, 3312, 3313, 3350, 3351, 3372 and 3373. • Define (transmission) resource requirement instead of PHY layer type. • Discussion: • The HT and VHT capabilities are simple criteria for responder. Tesource requirement is hard to estimate. Figure 8-401cu—Parameter Control Bitmap field Jarkko Kneckt (Nokia)

  4. HT and VHT support FILS Criteria • If a STA wants to receive a Probe Response frame from only a HT capable STA, the STA can transmit a Probe Request frame in HT PPDU format. Similarly VHT PPDU may be used for VHT AP responses • Discussion: • If the HT or VHT PPDU is transmitted, the transmission time of Probe Request will be longer: • PLCP header of the HT PPDU adds at minimum 8 microseconds • PLCP header of the VHT frame adds at minimum 12 microseconds Jarkko Kneckt (Nokia)

  5. Strawpoll • Are you in favour of having of option 1 or option2? • Option 1: use 2 bits to specify that the responder shall be HT or VHT capable as in 802.11ai draft 1.0. • Option 2: use HT PPDU or VHT PPDU to identify the capabilities of the responding AP as proposed by comments. • Results: • Option 1: 6 • Option 2: 1 Jarkko Kneckt (Nokia)

  6. Reduced Neighbor Report Request • Reduced Neighbor Report Request: CIDs 3349, 3371 • Request element (sub-clause 8.4.2.10) can be placed in a Probe Request frame to request that the responding STA include the requested information in the Probe Response frame. What is the difference with the Request element? • Discussion: • The proposed mode is default operation to request all other elements Jarkko Kneckt (Nokia)

  7. Delay Criteria • CIDs 3293 • The maximum value (of access delay) is therefore 200us x 255 = 51ms. Is this a concern? • Discussion: • The delay increases exponentially as a function of traffic load and congestion. In small delays the preciseness of the delay value is more important than in large delays. • Recovering from the delay requires transmission resources and time to transmit the buffered frames. • The APs with large delay values are not good candidates. Jarkko Kneckt (Nokia)

  8. Example resolutions: • What the group feels on the correct granularity of the access delay criteria? • Keep the value as it is: 200us x 255 = 51ms • Increase the value to 400us: 400us x 255 = 102ms • Use value 200us to 0-127 values and 400 us to 128-255, 200us x 127 + 400us x 128 = 77ms • Some other value / formula? Jarkko Kneckt (Nokia)

  9. Minimum Data Rate • CIDs 3352, 3374 • Comment: "The Minimum Data Rate field is 3 octets long and contains an unsigned integer in units of kilobits per second that specifies the lowest total data rate specified at the MAC_SAP for transport of MSDUs or AMSDUs that the STA is going to transmit. The minimum MAC_SAP data rate does not include the MAC and PHY overheads incurred in transferring the MSDUs or A-MSDUs." • What is the definition of the lowest total data rate? Is it a long-term throughput? Is it a singly linked throughput? • Discussion: • - The lowest total data rate is an estimation of the data amount that will be transmitted in future. Is it better to say that it is average or peak value of throughput in future? Jarkko Kneckt (Nokia)

  10. Strawpoll • Is the current definition as specified below acceptable for you? • "The Minimum Data Rate field is 3 octets long and contains an unsigned integer in units of kilobits per second that specifies the lowest total data rate specified at the MAC_SAP for transport of MSDUs or AMSDUs that the STA is going to transmit. The minimum MAC_SAP data rate does not include the MAC and PHY overheads incurred in transferring the MSDUs or A-MSDUs." • Yes: 3 • No: 2 • Don’t care: 5 Jarkko Kneckt (Nokia)