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Duplicate Bandwidth and Operation

March 2013. Duplicate Bandwidth and Operation. Authors:. Date: 2013-03-18. Duplicate Bandwidth Indication Requirement in 11ac/ah. Bandwidth and dynamic indication are carried in PHY scrambler seed field.

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Duplicate Bandwidth and Operation

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  1. March 2013 Duplicate Bandwidth and Operation Authors: Date: 2013-03-18 Liwen Chu, ST

  2. Liwen Chu, ST

  3. Liwen Chu, ST

  4. Liwen Chu, ST

  5. Duplicate Bandwidth Indication Requirement in 11ac/ah Bandwidth and dynamic indication are carried in PHY scrambler seed field. 3 bits are used: 2 bits for bandwidth indication (20MHz. 40MHz, 80MHz, 160/80+80MHz), 1bit for dynamic indication. Signalling TA is used to indicates that scrambler seed includes bandwidth. In 802.11ah, 1MHz duplicate and 2MHz duplicate are required. 4 bits is required for bandwidth and dynamic indication in a 1MHz duplicate mode. 3 bits for bandwidth indication (1MHz, 2MHz, 4MHz, 8MHz, 16MHz), 1bit for dynamic indication. There are issues in 11ah to carry bandwidth and dynamic indication in scrambler seed field. There is no legacy STAs in 11ah band. Changing control frames to carry Bandwidth and dynamic indication is ok. 7 reserved bits in Frame Control field can be used to carry such information. B10 B14 B0 B1 B2 B3 B4 B7 B8 B9 B11 B12 B13 B15 Liwen Chu, ST

  6. PHY Concerns • Assume that we carry over the 11ac scrambler seed mechanism for delivering the BW and Dyn BW indications. • In the case of 1MHz dup mode, 3 bits required for BW indication, and 1 bit required for DynBW indication, this leaves only 3 random bits for scrambling seed. • Only 7~8 combinations. • May affect the averaged data field PAPR. • An alternative design is to use the reserved bit in the SERVICE field, but typically we don’t want to use up all the bits in SERVICE field. • It is then easier to move this indication to MAC header reserved bits. • Parsing the additional MAC subfield is much easier and of lower risks. Liwen Chu, ST

  7. Proposed Duplicate Bandwidth Indication in 11ah In a 1MHz duplicate control frame, Bandwidth Indication 0, 1, 2, 3, 4 indicate 1MHz, 2MHz, 4MHz, 8MHz, 16 MHz respectively. Other values of Bandwidth Indication are reserved. In a 2MHz duplicate control frame, Bandwidth Indication 1, 2, 3, 4 indicate 2MHz, 4MHz, 8MHz, 16 MHz respectively. Other values of Bandwidth Indication are reserved. Dynamic Indication in RTS indicates whether duplicate RTS/CTS are used for dynamic bandwidth negotiation. Dynamic Indication is reserved (set to 0) in other control frames. B0 B1 B2 B3 B4 B7 B8 B10 B11 B12 B13 B14 B15 Liwen Chu, ST

  8. Pre Motion 1 • Do you agree to include in 802.11ah SFD bandwidth and dynamic bandwidth indication to be defined in the frame control fields of control frames with details TBD, whether this is to be applied to non-duplicate control frames except 1 or 2 MHz is TBD? Yes No Abstain Liwen Chu, ST

  9. Reference [1] 11-11/1137r13 Proposed Specification Framework for TGah. Liwen Chu, ST

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