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Hello, PHY adhoc group,
I presented the CRs for comments addressing sub-clause 32.2 in today's PHY adhoc meeting. One of the CRs is related to the definition of value of TXOP_DURATION parameter.
I double checked current 11be D0.3 and D0.4, and found two issues:
a). the floor function is not correctly shown in 11-21/0365r0. So I will change the text to "floor(...)" in 11-21/0365r1;
b). the referred tables (36-19 and 36-22) are correct in D0.3, but not correct in D0.4. In D0.4, these two tables are updated to 36-27 and 36-30 individually. Since the whole CR is for D0.3, I'll keep current reference and leave a note to the editor to remind the change of the sequence numbers of Tables in D0.4.
The updated modification to the value of TXOP_DURATION parameter when FORMAT is EHT_MU or EHT_TB is as below:
Indicates the TXOP duration.
Enumerated type or integer:
UNSPECIFIED indicates no NAV value specified.
0 – 8448 indicates a value in units of 1 µs that is used to update the NAV for this TXOP (see 26.2.4 (Updating two NAVs)).
TXVECTOR parameter TXOP_DURATION is converted to a value in the TXOP subfield of EHT-SIG (see Table 36-19 (U-SIG field of an EHT MU PPDU) and Table 36-22 (U-SIG field of an EHT TB PPDU)) as follows:
TXOP_DURATION = UNSPECIFIED: B0-B6 = 127
TXOP_DURATION < 512: B0 = 0, B1-B6 = floor(TXOP_DURATION / 8)
Otherwise: B0 = 1, B1-B6 = floor((TXOP_DURATION – 512) / 128)
RXVECTOR parameter TXOP_DURATION is determined from the value in the TXOP subfield of U-SIG field (see Table 36-19 (U-SIG field of an EHT MU PPDU) and Table 36-22 (U-SIG field of an EHT TB PPDU)) as follows:
B0-B6 = 127: TXOP_DURATION = UNSPECIFIED
B0 = 0: TXOP_DURATION = 8 × B1-B6
Otherwise: TXOP_DURATION = 512 + 128 × B1-B6
See 35.8.1.X (TXOP_DURATION) for more details.
Please let me know if you have any comment to the spec text modification.
Best Regards,
Bo
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