1. Sounding Antenna Switching for IEEE 802.16m Amendment Working Document
IEEE Presentation Submission Template (Rev. 9)
Document Number:
IEEE C80216m-0848
Date Submitted:
Source: KeunChul Hwang, Yongseok Kim, Seungwon Kang, Inseok Hwang, Soon Young Yoon
Samsung Electronics
Venue: IEEE m Session#61, Cairo, Egypt
Base Contributions:
N/A
Re: Call for Contributions on Project m Amendment Working Document (AWD) Content
Purpose: To discuss and adopt in TGm
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2. Motivation
In current AWD text(80216m-09_0010r1a), sounding antenna switching is determined to be supported, but the details is TBD.
This contribution intends to specify the details for supporting sounding antenna switching

3. Simulation Parameters
Assumption
Cell Configuration
Hexagonal grid, 19 Cell sites, 3 sectors per site
Path loss model
Loss (dB) = log10(R) (R in km)
Site-to-Site Distance
1.5 km
Carrier Frequency
2.5 GHz
Bandwidth
10Mhz
BS Tx Power
46dBm
BS Tx / MS Rx antenna
4Tx (ULA 4 ) / 2
Channel Model
SCM Urban Macro 3km/h
Sounding Multiplexing
CDM (P = 18)
Multi target PC
ON (4 class)
Number of Simultaneous Sounding User Per Sector 4
Number of Users Per Sector 16
Sounding Channel Delay for generating ZF weighting
Single antenna(1Tx) : 1 frame delay for fixed single antenna
Multi antenna(2Tx) : 1 frame delay for 2 antenna
Antenna switching : 1frame delay for one antenna and 2 frame delay for another antenna

4. Simulation Results
DL MIMO performance according to sounding antenna configuration
DL 4 x 2 ZF MU-MIMO with sounding
Sector Throughput Enhancement
Single Antenna (1Tx) Sounding
100 % (ref.)
Multi Antenna (2Tx) Sounding
112 %
Antenna Switching Sounding
114 %

5. Proposed Antenna Switching
Proposed Text and Operation Example
Text: When the number of AMS’ antennas is T and the number of AMS RF Tx chain is R, AMS should transmit the sounding signal with antenna switching during the consecutive T/R frames starting from every periodic frame corresponding to periodicity and sounding relevance. At the ith (i = 0,1, … , T/R1) frame out of the consecutive T/R frames, the index of antenna of MS for sounding transmission is chosen as: from ‘(i☓R)’ to ‘((i☓R) + R1)’. For periodic sounding allocation, BS should set the periodicity larger than or equal to T/R.
Operation Example
T = 2, R = 1, Sounding periodicity = 4

6. Proposed Remedy
Adopt the following proposed text in line 9, page 119 (section in 80216m-09_0010r1a)
Multiplexing for multi-antenna and multi-AMS
The uplink sounding channels of multiple AMS and multiple antennas per AMS can be multiplexed through [Option 1: decimation separation or cyclic shift separation][Option2: decimation separation] in each sounding allocation. Also, in case of multiple UL subframes for sounding, time division separation can be applied by assigning different AMS to different UL subframe. For cyclic shift separation each AMS occupies all subcarriers within sounding allocation and uses the different sounding waveform [Editor's note: remove this sentence if Option 2 will be adopted]. For frequency decimation separation each AMS uses decimated subcarrier subset from the sounding allocation set with different frequency offset. For antenna switching capable AMS, ABS can command the AMS to switch the physical transmit antenna(s) for sounding transmission. The details for supporting antenna switching on sounding is TBD. When the number of AMS’ antennas is T and the number of AMS RF Tx chain is R, AMS should transmit the sounding signal with antenna switching during the consecutive T/R frames starting from every periodic frame corresponding to periodicity and sounding relevance. At the ith (i = 0,1, … , T/R1) frame out of the consecutive T/R frames, the index of antenna of MS for sounding transmission is chosen as: from ‘(i☓R)’ to ‘((i☓R) + R1)’. For periodic sounding allocation, BS should set the periodicity larger than or equal to T/R. 6