CR on Relay in 802.16m SDD
IEEE 802.16 Presentation Submission Template (Rev. 9)
Document Number:
IEEE C80216m-09/0421
Date Submitted:
2009-2-27
Source:
Gang Shen, Kaibin Zhang, Jimin Liu
Alcatel-Lucent Shanghai Bell
E-mail:
gang.a.shen@alcatel-sbell.com.cn
Xiaolu Dong, Ying Du, Daning Gong
CATR
E-mail:
dongxiaolu@mail.ritt.com.cn
Zhuo Gao
Datang Mobile
E-mail:
gaozhuo@datangmobile.cn
Venue:
Re: IEEE 802.16m-09/0008, “IEEE 802.16m Internal Documents Configurations Control Procedure (CCP)”
Base Contribution:
N/A
Purpose:
To be discussed and adopted IEEE 802.16m SDD
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Background
• Problem:
• 16j non-transparent relay provides coverage extension for MS out of BS coverage,
but it is not optimally designed for MS in the overlapped coverage area
• MS gets data and USCCH from one source in non-transparent relay mode
• Motivation:
• Allow MS in the overlapped area to get USCCH from appropriate access stations
(e.g. BS or RS)
• Efficiently support cooperative relay
RS
BS
USCCH
Data
MS
Fig. Non-transparent relay
Advanced non-transparent relay in 16m
 Non-transparent relay transmits SCH, BCH and USCCH
 A MS may communicate with one RS or more (e.g. BS and RS in cooperation) for data
 If a MS is within an overlapped coverage area (e.g. covered by both BS and RS), an
appropriate station (e.g. BS or RS) is selected to transmit control signals e.g. USCCH to
the specific MS.
• The MS may get USCCH directly from the BS, and get data from the RS
• When a MS is out of the coverage of BS, the MS gets USCCH from the RS it is attached.
An example is illustrated in the left figure
RS
USCCH
Data
USCCH
Data
MS1
MS2
BS
• MS1 is in the area with a deep fading from BS,
and thus it can only get USCCH and data from
the RS.
• In comparison, MS2 is in the overlapped
coverage area, it may receive USCCH from the
BS and get data from the RS.
Comparison
• What is the difference: 16j non-transparent relay and 16m nontransparent relay (illustrated in DL as an example)
– 16j non-transparent RS: all MSs associated with RS receive both USCCH
and data from RS
– 16m non-transparent relay allows
• MS receives USCCH from an appropriate access station
• Have both merits of transparent relay and non-transparent relay
Benefits for the MS in the overlapped area
• Decrease latency of control signaling, i.e. the DL control
signaling is transmitted to the MS directly without processing
and scheduling delay at intermediate RS
- E.g. UL bandwidth grant, UL HARQ ACK/NACK
• Reduce the control signaling overhead
• Centralized scheduling benefits high bandwidth efficiency
• Support for cooperative relay
Support for cooperative relay
• An an example regarding BS-RS cooperative relay
– A MS may receive USCCH from the BS directly, while it receive data
from both BS and RS in cooperation mode.
– Optionally, it is also allowed for the MS to receive USCCH from the RS,
while get data from both.
– It is also adapted to the RS-RS cooperation.
BS
Data
USCCH
Data
RS
MS2
Suggested Remedy
[Add the following texts in line 1 of page 132 as
indicated]
“For non-transparent relay, if an AMS is within an
overlapped coverage area covered by two or more
stations (ARS or ABS), the AMS may get control
signals e.g. USCCH from one station, and exchange
traffic data with other station(s).”