MCS on different frequency segments. 585 23.2.2 The modifications to More modifications of Rejected. Table 22-1 is not Table 22-1 sufficient to optimize (TXVECTOR and See multiple MCS the performance in RXVECTOR) are discussion. TVWS: e.g, 1)SNR required to optimize (when FORMAT is the TVWS operation. VHT) is a measure of the received SNR per spatial stream cannot be simply reused in the multi-channel case. In TVWS operation, SNR values of the multi-channels could be significantly different; 2) TXPWR_LEVEL: a single tx power level is not sufficient in case, especially when one aggregated channel is adajacent to the DTV occupied channel. TXPWR_LEVEL should be modified; 3) Single MCS is not sufficient in case, where SNR values are highly fluctuated. 759 23.3.3 Unlike in 802.11ac, Insert a multiplicative Rejected. unequal power factor on each transmission should frequency segment 11ac operates in several be specified in prior to D/A to reflect different band where power 802.11af for cases difference in limits vary much more than where more than one transmitted power. 40mW vs. 100mW. frequency segment is Alternatively, insert used. For example, if different TxPwrLevels The has been discussed one of the aggregated for each in 11ac and the decision channels has a channel/frequency should uphold in 11af as well limitation of 40 mW segment in the (adjacent channel) TXVector and another channel has a limit of 100 mW, 802.11af should allow transmission of unequal power levels 761 23.3.5 Use separate Allow separate Rejected. interleaving and Using one interleaver for coding on different per frequency both frequency segments is frequency segments. segment. superior to maximize diversity out of narrow 5MHz channels 460 23.3.5 Use separate add proper text to Rejected. interleaving and Allow separate coding on different
MCS on different frequency segments. 585 23.2.2 The modifications to Table 22-1 is not sufficient to optimize the performance in TVWS: e.g, 1)SNR (when FORMAT is VHT) is a measure of the received SNR per spatial stream cannot be simply reused in the multi-channel case. In TVWS operation, SNR values of the multi-channels could be significantly different; 2) TXPWR_LEVEL: a single tx power level is not sufficient in case, especially when one aggregated channel is adajacent to the DTV occupied channel. TXPWR_LEVEL should be modified; 3) Single MCS is not sufficient in case, where SNR values are highly fluctuated. More modifications of Table 22-1 (TXVECTOR and RXVECTOR) are required to optimize the TVWS operation. Rejected. See multiple MCS discussion. 759 23.3.3 Unlike in 802.11ac, unequal power transmission should be specified in 802.11af for cases where more than one frequency segment is used. For example, if one of the aggregated channels has a limitation of 40 mW (adjacent channel) and another channel has a limit of 100 mW, 802.11af should allow transmission of unequal power levels Insert a multiplicative factor on each frequency segment prior to D/A to reflect difference in transmitted power. Alternatively, insert different TxPwrLevels for each channel/frequency segment in the TXVector Rejected. 11ac operates in several different band where power limits vary much more than 40mW vs. 100mW. The has been discussed in 11ac and the decision should uphold in 11af as well 761 23.3.5 Use separate interleaving and coding on different frequency segments. Allow separate per frequency segment. Rejected. Using one interleaver for both frequency segments is superior to maximize diversity out of narrow 5MHz channels 460 23.3.5 Use separate interleaving and coding on different add proper text to Allow separate Rejected.
11-12-1337-02-00af-proposed-comment-resolutions.docx