Optimizing OFDM TRN Subfield for Channel Aggregation in IEEE 802.11-18/196r2 Document
Explore the proposed OFDM TRN subfield for channel aggregation in the IEEE 802.11-18/196r2 document, focusing on optimizing transmission chains per channel. The presentation delves into examples and matrices for different scenarios, offering insights into improvements for channel aggregation efficiency in wireless communications.
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JAN 2018 doc.: IEEE 802.11-18/196r2 OFDM TRN subfield for Channel Aggregation Date: 2018-01-15 Authors: Name Affiliations Address Phone email Sunwoong Yun LG Electronics Seocho LG sunwoong.yun@lge.com R&D Lab, Korea SungJin Park LG Electronics allean.park@lge.com Saehee Bang LG Electronics saehee.bang@lge.com JinMin Kim LG Electronics jinmin1230.kim@lge.com Jinsoo Choi LG Electronics js.choi@lge.com Sanggook Kim LG Electronics San Diego sanggook.kim@lge.com /California/ US Slide 1 LG
JAN 2018 doc.: IEEE 802.11-18/196r2 Introduction In [1], SC TRN subfield for channel aggregation was proposed and determined by the number of TX chains per channel. OFDM TRN subfield for channel aggregation need to be optimized similar to SC TRN subfield This presentation suggests OFDM TRN subfield for channel aggregation Slide 2 LG
JAN 2018 doc.: IEEE 802.11-18/196r2 Example of current OFDM TRN subfield For CB, the number of TX chains per channel is same as the total number of TX chains. For CA, the number of TX chains per channel is same as half of the total number of TX chains. Example CB case (2.16GHz), 2 TX chains per channel TRN subfield after 2x2 P matrix mapping = = 1 TRN 1 1 itx itx 1 _ 1 _ TRN BASIC TRN BASIC = = 2 2 itx itx 1 _ _ TRN BASIC BASIC CA case(2.16GHz + 2.16GHz) 2 TX chains per channel(totally 4 TX chains) TRN subfield after 4 x 4 P matrix mapping = 3 _ 1 _ 1 BASIC TRN BASIC TRN = = = = 1 TRN 1 1 1 1 1 itx itx itx itx 1 _ 1 _ 1 _ 1 _ TRN BASIC TRN BASIC TRN BASIC TRN BASIC = = = = 1 1 2 2 2 2 itx itx itx itx 1 _ _ _ 1 _ TRN BASIC BASIC TRN BASIC TRN BASIC = = = 1 1 TRN 3 3 3 itx itx itx itx _ _ TRN BASIC TRN BASIC TRN BASIC TRN BASIC = = = = 4 4 4 4 itx itx itx itx _ 1 _ 1 _ _ TRN BASIC BASIC In this case, CA TRN subfield may have 2 times longer TRN subfield than CB case Slide 3 LG
JAN 2018 doc.: IEEE 802.11-18/196r2 Proposed OFDM TRN subfield for CA(1/3) We propose that P matrix of CA TRN subfield should be determined by the number of TX chains per channel. Example CB case (2.16GHz), 2 TX chains per channel TRN subfield after 2x2 P matrix mapping = = 1 TRN 1 1 itx itx 1 _ 1 _ TRN BASIC TRN BASIC = = 2 2 itx itx 1 _ _ TRN BASIC BASIC CA case(2.16GHz + 2.16GHz) 2 TX chains per channel(totally 4 TX chains) TRN subfield after 2x2 P matrix mapping for each aggregated channel _ 1 _ 1 BASIC TRN BASIC TRN = = 1 1 itx itx 1 _ 1 _ TRN BASIC TRN BASIC for channel 1 = = 2 2 itx itx = = 1 TRN 3 3 itx itx 1 _ 1 _ TRN BASIC TRN BASIC BASIC for channel 2 = = 4 4 itx itx 1 _ _ TRN BASIC Slide 4 LG
JAN 2018 doc.: IEEE 802.11-18/196r2 Proposed OFDM TRN subfield for CA(2/3) Proposed P matrix for CA TRN subfield is as follows: Total number of TX chains TX chain number TRN_BASIC P Matrix for each channel 2 1 ???_????????=1 [1 -1] 2 ???_????????=2 [1 -1] 4 1 ???_????????=1 + 1 1 + + 2 1 1 ???_????????=2 3 ???_????????=3 + 1 1 + + 1 1 4 ???_????????=4 + + 1 6 ???_????????=? 1 1 w 1 ( ) 3 / + = 1 3 2 3 1 , exp 2 w w j 2 ???_????????=? 3 + 2 3 4 3 1 w w 3 ???_????????=? 4 ???_????????=? + + 1 1 w 1 ( ) 3 / 5 + = 1 3 2 3 ???_????????=? 1 , exp 2 w w j 3 + 2 3 4 3 1 w w 6 ???_????????=? Slide 5 LG
JAN 2018 doc.: IEEE 802.11-18/196r2 Proposed OFDM TRN subfield for CA(3/3) Total number of TX chains TX chain number TRN_BASIC P Matrix for each channel 8 1 ???_????????=1 + + + 1 1 1 1 + + + 1 1 1 1 2 ???_????????=2 + + + 1 1 1 1 3 ???_????????=3 + + + 1 1 1 1 4 ???_????????=4 5 ???_????????=5 + + + 1 1 1 1 + + + 6 ???_????????=6 1 1 1 1 + + + 1 1 1 1 7 ???_????????=7 + + + 1 1 1 1 8 ???_????????=8 We can reduce length of OFDM TRN subfield in CA by 50% applying above P matrix with no channel measurement performance degradation. Slide 6 LG
JAN 2018 doc.: IEEE 802.11-18/196r2 Conclusion We propose that P matrix of OFDM TRN subfield in CA should be defined by the number of TX chains per channel, not by the number of total TX chains. We can reduce OFDM TRN subfield in CA with half of current OFDM TRN subfield. Slide 7 LG
JAN 2018 doc.: IEEE 802.11-18/196r2 Straw Poll Do you agree to accept the text in 11-18-197-02-00ay - Draft text for OFDM TRN subfield for Channel Aggregation? Slide 8 LG
JAN 2018 doc.: IEEE 802.11-18/196r2 References [1] 11-17-1601-01-00ay-draft-text-for-ca-trn-subfield Slide 9 LG
