Relay Station Modes
IEEE 802.16 Presentation Submission Template (Rev. 9)
Document Number:
IEEE C802.16m-08/1240
Date Submitted:
2008-10-31
Source:
Kanchei (Ken) Loa, Yi-Hsueh Tsai, Chun-Yen Hsu, Youn-Tai Lee
Institute for Information Industry
E-mail: loa@iii.org.tw
Yung-Ting Lee, Hua-Chiang Yin,
Coiler
Shiann-Tsong Sheu
National Central University
*<http://standards.ieee.org/faqs/affiliationFAQ.html>
Venue:
IEEE 802.16m-08/040 Call for Comments and Contributions on Project 802.16m System Description Document (SDD)
Base Contribution:
N/A
Purpose:
Propose a efficient addressing method
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Why RS Modes?
 In order to provide coverage extension and/or
throughout enhancement in a Multihop Relay
system under limited radio resources, the
deployment of the 16m BS and 16m RS should
be flexible enough to accommodate different
modes of RSs co-existence in a Multihop
Relay system.
 An RS could adaptively change its mode
depending on the operation environment.
Relay Station Modes
 RS Modes could be categorized by the transceiver
mode, SCH, segment and cell identifier as follows
 Because segment and cell identifier are derived from
the SCH, each RS mode is characterized based on the
transceiver mode and SCH.
Grouped RS
STR relay
16m RS
Transceiver mode
Distributed
SCH
Uplink only
TTR relay
Grouped RS
Distributed
16m Relay Usage Models
The deployment of relay stations (RS) can provide
several key benefits to optimize the coverage of a
mobile WiMAX network, namely, to eliminate
coverage holes and to extend the range of both the
downlink and uplink. It also provides an efficient
solution to improve per user cell edge throughput
as well as indoor coverage. The coverage
enhancement arises from improved SINR at the
receiver. Instead of the coverage enhancement, the
improved SINR can be utilized to improve
throughput and consequently the cell capacity.
Thus the coverage enhancement can be also
traded-off for capacity enhancement.
16m Relay Mode vs. Usage Models
Throughput Coverage
enhancement Extention
RS mode
Uplink
Throughput
Uplink
Range
TTR
Support
Support
STR
Support
Support
TTR
Support
Support
STR
Support
support
Uplink-only RS
Grouped RS
Distributed RS
Proposed SDD Text
[Insert the following text into 3.1 Definitions:]
 Simultaneous transmit and receive (STR) relay: a
relay mechanism where transmission to subordinate
station(s) and reception from the superordinate station,
or transmission to the superordinate station and
reception from subordinate station(s) are performed
simultaneously.
 Time-division transmit and receive (TTR) relay: a
relay mechanism where transmission to subordinate
station(s) and reception from the superordinate
station, or transmission to the superordinate station
and reception from subordinate station(s) is separated
in time.
Proposed SDD Text
[Insert the following text into 3.1 Definitions:]
 Uplink-only RS: a relay only relays the uplink traffic
from subordinate SSs to its access station, and does
not transmit in the DL subframe.
 Grouped RS: a relay transmits the SCH that is
identical to the one sent by its access station. The
access station determines the bandwidth allocations
and generates the MAPs for all grouped RSs in the
same RS group.
 Distributed RS: a relay transmits the SCH that is
different from the one sent by its access station. The
relay determines the bandwidth allocations and
generates the MAPs for their subordinate SSs/RSs.