Sounding Antenna Switching for IEEE 802.16m Amendment Working Document
IEEE 802.16 Presentation Submission Template (Rev. 9)
Document Number:
IEEE C80216m-0848
Date Submitted:
2009-04-27
Source: KeunChul Hwang, Yongseok Kim, Seungwon Kang, Inseok Hwang, Soon Young Yoon
Samsung Electronics
Alexei Davydov
Intel Corporation
keunchul.hwang@samsung.com
alexei.davydov@intel.com
Venue: IEEE 802.16m Session#61, Cairo, Egypt
Base Contributions:
N/A
Re:
Call for Contributions on Project 802.16m Amendment Working Document (AWD) Content
Purpose:
To discuss and adopt in TGm
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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
Simulation Parameters
•
Parameter
Assumption
Cell Configuration
Hexagonal grid, 19 Cell sites, 3 sectors per site
Path loss model
Loss (dB) = 130.19 + 37.6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
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 %
Proposed Antenna Switching
• Proposed Scheme and Operation Example
– Scheme: For sounding with antenna switching, the AMS shall transmit sounding symbol
with the ith antenna (0, 1, …, Nt1) on frames n = jT+i, where n = 0 corresponds to the
frame where UL sounding command A-MAP IE is received, T is periodicity in UL
sounding command A-MAP IE, and j is a running index ( j = 0, 1, 2, … for T  0 and j = 0
for T = 0). For sounding with antenna switching and periodical sounding allocation (T 
0), the assigned periodicity T shall be larger or equal to the number of AMS transmit
antennas Nt.
– Operation Example
• Nt = 2, periodicity = 4
Sounding Periodicity
(k)-frame
…
DL
UL
DL
(k+1)-frame
UL
DL
Sounding Periodicity
(k+2)-frame
UL
Transmission of Transmission of
sounding signal sounding signal
with 1st Antenna with 2nd Antenna
Sounding
allocation
DL
(k+3)-frame
UL
DL
(k+4)-frame
UL
DL
(k+5)-frame
UL
DL
(k+6)-frame
UL
…DL
Transmission of Transmission of
sounding signal sounding signal
with 1st Antenna with 2nd Antenna
(k+7)-frame
UL
DL
UL
…
Proposed Remedy
• Adopt the following proposed text in line 9, page 119 (section 15.3.9.2.3.2.
in 80216m-09_0010r1a)
15.3.9.2.3.2 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 and multi-antenna 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. For sounding with antenna switching, the AMS shall transmit
sounding symbol with the ith antenna (0, 1, …, Nt1) on frames n = jT+i, where n = 0
corresponds to the frame where UL sounding command A-MAP IE is received, T is periodicity
in UL sounding command A-MAP IE, and j is a running index ( j = 0, 1, 2, … for T  0 and j
= 0 for T = 0). For sounding with antenna switching and periodical sounding allocation (T 
0), the assigned periodicity T shall be larger or equal to the number of AMS transmit antennas
Nt.