Proposed Text on Relaying Model for IEEE 802.16m SDD
IEEE 802.16 Presentation Submission Template (Rev. 9)
Document Number:
IEEE C802.16m-08/1412r1
Date Submitted:
2008-10-31
Source:
Aeran Youn, Jong Young Han, Dongguk Lim
Voice: +82-31-450-7188
Jin Sam Kwak, Kiseon Ryu
E-mail : {aryoun; fanaticey, dongguk, samji; ksryu}@lge.com
LG Electronics
LG R&D Complex, 533 Hogye-1dong, Dongan-gu, Anyang, 431-749, Korea
Li-Hsiang Sun, Ki-Dong Lee
LG Electronics
San Diego, USA
Email: {lsun, kidonglee}@lge.com
Venue:
TGm SDD: Relay - IEEE 802.16m-08/040 “Call for Contributions and Comments on Project 802.16m System Description Document
(SDD)”, in response to the following topics: “Section 15 Support for multi-hop relay
Base Contribution:
IEEE C80216m-08/1412r1
Purpose:
Discuss and adopt by TGm for Relay SDD Text.
Notice:
This document does not represent the agreed views of the IEEE 802.16 Working Group or any of its subgroups. It represents only the views of the participants listed in
the “Source(s)” field above. It is offered as a basis for discussion. It is not binding on the contributor(s), who reserve(s) the right to add, amend or withdraw material
contained herein.
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1
Proposed Text on Relaying Model
for IEEE 802.16m SDD
2
Contents
 Introduction
 Transparent Relay Frame structure
 Transparent Relay Frame Structure
 Coexistence with transparent and non-transparent Relay Frame Structure
 DL Control Structure
 R-SCH
 BCH
 USCCH
 UL Control Structure
 Ranging for Non-synchronized MS/RS
 Fast feedback channel for MS/RS
 Bandwidth Request channel for MS/RS
 Text proposal
 References
3
Introduction
 In this contribution, we propose overall procedure of relaying
model, especially transparent relay mode.
 Assumptions
 16m MS should support 16m RS-awareness as agreed in 16jm ad-hoc [3].
 Transparent and non-transparent mode can coexist in the 16m BS
 Definition of Transparent and non-transparent mode
 Transparent RS
- A transparent mode means that a transparent RS does not transmit DL superframe-start
preamble (P-SCH), BCH, USCCH but the RS can transmit R-SCH for RS identification.
- In this contribution, the transparent mode limits 2-hop (does not consider multi-hop for
transparent mode).
 Non-transparent RS
- A non-transparent means that a non-transparent RS transmits DL superframe-start
preamble (P-SCH), BCH, USCCH [2].
4
Frame Structure (1/3)
 Transparent mode(1/2)
 A 16m BS should support transparent RS for throughput enhancement
 To support for RS-awareness, the 16m BS provides transparent RS information to the 16m
MS trying to communicate with the BS indirectly via the 16m RS
 RS Cell ID, R-SCH offset, etc
DL
16m DL Tx
Zone
BS MS
UL
16m DL
Access Zone
16m UL
Access Zone
BS MS
BSMS
16m UL Rx
Zone
BS MS
BS RS
BS RS
16m Bidirectional Rx
Zone
16m DL
Transmit Zone
(Rx)
G
A
P
(Rx)
(Rx)
16m Bidirectional Tx
Zone
16m UL Receive
Zone
RS MS
RS MS
(Tx)
(Rx)
5
G
A
P
Tx to BS
(Tx)
Rx from
BS
(Tx)
(Tx)
Frame Structure (2/3)
 Transparent mode(2/2)
 Definitions corresponding to transparent relay frame structure
 16m DL Transmit Zone: An integer multiple of subframes located in the 16m zone of
the DL of the BS frame or RS frame, where a 16m BS or RS can transmit to the 16m
MSs and subordinate 16m RSs.
 16m DL Access Zone: An integer multiple of subframes located in the 16m zone of
the DL of the BS frame, where a 16m BS can transmit to the 16m MSs.
 16m Bi-directional Receive Zone: An integer multiple of subframes located in the
16m zone of the RS frame, where reception from superordinate as well as
subordinate station takes place.
 16m UL Access Zone; An integer multiple of subframes located in the 16m zone of
the UL of the BS frame, where a 16m BS can receive from the 16m MSs.
 16m UL Receive Zone: An integer multiple of subframes located in the 16m zone of
the UL of the 16m BS or RS frame, where a 16m BS or RS can receive from the 16m
MSs or subordinate 16m RS.
 16m Bi-directional Transmit Zone: An integer multiple of subframes located n the
16m zone of 16m RS frame, where transmission to superordinate as well as
subordinate station take place.
6
Frame Structure (3/3)
16m UL
Receive Zone
BS MS
BS RS
16m DL
Transmit Zone
16m Bi-directional Receive Zone
G
A
P
Odd-Hop RS
Even-Hop RS
(Tx)
(Rx)
16m DL Access
Zone
RS MS
16m Bidirectional
Transmit Zone
(Tx)
(Tx)
G
A
P
(Rx)
16m Bidirectional
Transmit Zone
16m UL Receive
Zone
RS MS
G
Odd-Hop RS A
P
Even-Hop RS
(Rx)
16m DL Receive
Zone
16m UL
Transmit Zone
(Rx)
(Rx)
Tx to
Even-Hop
Superordinate/Su
bordinate RS
or BS
(Tx)

(Tx)
(Tx)
16m Bidirectional
Receive Zone
G
A
P
(Tx)
Case I: FS supporting coexistence modes
7
Rx from
Odd-Hop
Superordinate/
Subordinate
RS
 Case I: using 16m DL Tx Zone
 Case II: using Bi-directional Tx Zone
BSMS
Tx to
Odd-Hop
Superordinate RS
or BS
 At the initial network entry, a nontransparent subordinate RS coexisting
with odd-hop transparent
superordinate RS can synchronize with
a BS
 A transparent RS may forward the
USCCH to non-transparent RSs
BS MS

BS  transparent RS  MS
BS  non-transparent RS  nontransparent RS… MS
16m UL
Access Zone
Rx from
Even-Hop
Superordinate RS
or BS
-
16m DL
Access Zone
BS RS
Tx to
Odd-Hop
Superordinate/
Subordinate RS
 A BS communicates with transparent
RS and non-transparent RS separately
BS MS
Rx from
Even-Hop
Superordinate/Su
bordinate RS
or BS
BS  transparent RS  nontransparent RS …  MS
UL
16m DL Transmit Zone
RS  MS
-
BS Frame Structure
 A transparent RS is superordinate RS of
a non-transparent RS
Odd-Hop RS Frame
Structure: Transparent
 Two types of Coexistence
DL
Even-Hop RS Frame
Structure: Non-transparent
 Coexistence with transparent and
Non-transparent mode
(Rx)
Frame Structure (3/3)
-
Case I: 16m DL Receive Zone after
16m Transmit Zone
Case II: 16m DL Access Zone after
transmit zone
BS Frame Structure
BS MS
BSMS
16m UL
Receive Zone
BS MS
(Tx)
16m DL Access
Zone
16m Bi-directional Receive Zone
G
A
P
(Rx)
16m DL Access
Zone
16m Bidirectional
Transmit Zone
(Tx)
(Tx)
(Rx)
RS MS
(Tx)
(Rx)
RS MS
(Tx)
16m Bidirectional
Transmit Zone
16m UL Access
Zone
RS MS
16m DL Access
Zone
(Rx)
G
A
P
Tx to
Even-Hop
Superordinate/Su
bordinate RS
or BS
(Tx)
16m UL Access
Zone
RS MS
(Rx)
Case II: FS supporting coexistence modes
8
(Tx)
16m Bidirectional
Receive Zone
Rx from
Odd-Hop
Superordinate/
Subordinate
RS
 Even-hop non-transparent RS:
16m UL
Access Zone
BS RS
Tx to
Odd-Hop
Superordinate/
Subordinate RS
-
Case I: 16m DL Transmit Zone after
16m Receive Zone
Case II: 16m DL Access Zone after
receive zone
16m DL
Access Zone
BS RS
Rx from
Even-Hop
Superordinate/Su
bordinate RS
or BS
-
BS MS
RS  MS
 BS: 16m Access Zone after 16m
Transmit Zone
 Odd-hop transparent RS:
UL
16m DL Transmit Zone
Odd-Hop RS Frame
Structure: Transparent
 The order of DL zone of 16m BS and
16m RS in Option 1 & 2 relay frame
structure should be changed for
coexistence support.
DL
Even-Hop RS Frame
Structure: Non-transparent
 Coexistence with transparent and
Non-transparent mode
(Rx)
DL Control Structure(1/3)
 Downlink control channel are needed to convey information of 16m
RS
16m S-SCH
16m P-SCH
16m R-SCH
16m BS
Super-Frame: 20 ms
5 ms
16m RS
5 ms
 Relay Synchronization Channel (R-SCH)
 In transparent mode, a 16m RS should not transmit P-SCH but the 16m RS
should transmit R-SCH (s)
 The R-SCH provides a reference signal for RS awareness and RS identification
(ID)
 The location of the R-SCH symbol (s) is the fixed start of 16m DL Transmission
Zone within one frame
 The number of R-SCH within one superframe is TBD
9
DL Control Structure(2/3)
 Broadcast Channel (BCH)
 A BCH carries essential system parameters and system configuration information of 16m
BS and 16m RS
 In transparent mode, the BS can broadcast relay identification-related information such
as RS Cell IDs, the location of the R-SCH, and Relay-USCCH (R-USCCH) position or
relevance-time information, etc
 In non-transparent mode, the BS or RS can broadcast the relative position or relevancetime information of R-USCCH with one or more 16m subordinate RSs
Super-Frame : 20 ms
SU0
SU1
SU2
SU3
Frame : 5 ms
F0
F1
Relative postion
F2
F3
Super-Frame Header
N-USCI
USCI
R_N-USCI
R-USCI
Broadcast Channel
Unicast Service Control Channel
- Non-User-Specific Control Information(N-USCI)
- User-Specific Control Information(USCI)
Relay Unicast Service Control Channel
- Relay Non-User-Specific Control Information(R_N-USCI)
-R
10User-Specific Control Information(USCI)
DL Control Structure(3/3)
 Unicast Service Control Channels (USCCH)
 USCCH is multiplexed Non-Relay USCCH and Relay-USCCH using FDM
 Non-Relay USCCH
- Non-user-specific control information (N-USCI)
- User-specific control information (USCI)
 Relay-USCCH
- Relay Non-user-specific control information (R_N-USCI)
- Relay User–specific control information (R-USCI)
 In transparent mode,
 R_N-USCI can indicate relevance time for the location of the resource allocation
 R_N-USCI can provide the location of the next R_N-USCI
 N-USCI provides control information of MSs which directly communicates with the
16m BS to decode the USCI
 The USCI contains allocation information for the MSs.
 The R_N-USCI provides control information of MSs which indirectly communicates
with the 16m BS via 16m RS to decode the R-USCI
 The R-USCCH contains allocation information for relayed MSs
- The R-USCCH can divide Downlink R-USCCH and UL R-USCCH
 In non-transparent mode,
 The R-USCCH contains allocation information for the RSs to transmit in the DL
transmit zone to its subordinate RSs or MSs
11
UL Control Structure
 In transparent mode, the UL control channels carry multiple types of
control information to support the procedures on the access and relay links
 UL Ranging Channel for non-synchronized MS/RS
 In transparent relay mode, the IEEE 802.16m UL ranging channel structure can be
reused for uplink synchronization of the non-synchronized MS and RS.
 MSs and RSs can use the same or separate ranging opportunities for UL synchronization
 UL Fast Feedback Channel
 For the transparent mode, IEEE 802.16m UL fast feedback channel can be reused to
transmit the channel quality feedback from MS to the 16m RS.
 For RS transmission of the channel measurement/quality report to BS, the additional
feedback channel can be defined in the UL relay zone
 Details of UL fast feedback channel for the RS is FFS
 Bandwidth Request Channel
 Contention based or non-contention based random access is used to transmit a
bandwidth request indicator on this control channel
 In the contention based random access, for transparent relay mode, BS and each RS do not
know which MS or RS transmit the bandwidth request indicator and which MS or RS connect
with them
 Bandwidth request channels for BS and each RS may be separated by code, time and frequency
or other resource to distinguish MS and/or RS.
12
Text proposal
15. 1 Frame structure
15.1.1 Transparent Relay Frame Structure(1/3)
DL
16m DL Tx
Zone
BS MS
UL
16m DL
Access Zone
16m UL
Access Zone
BS MS
BSMS
16m UL Rx
Zone
BS MS
BS RS
BS RS
16m Bidirectional Rx
Zone
16m DL
Transmit Zone
(Rx)
G
A
P
(Rx)
(Rx)
16m Bidirectional Tx
Zone
16m UL Receive
Zone
RS MS
RS MS
(Tx)
(Rx)
G
A
P
Figure x. Transparent relay frame structure
13
Tx to BS
(Tx)
Rx from
BS
(Tx)
(Tx)
Text proposal
15. 1 Frame structure
15.1.1 Transparent Relay Frame Structure(2/3)
The definitions in the transparent relay frame structure as shown in Figure x are as follows:
 16m DL Transmit Zone: An integer multiple of subframes located in the 16m zone of the
DL of the BS frame or RS frame, where a 16m BS or RS can transmit to the 16m MSs and
subordinate 16m RSs.
 16m DL Access Zone: An integer multiple of subframes located in the 16m zone of the DL
of the BS frame, where a 16m BS can transmit to the 16m MSs.
 16m Bi-directional Receive Zone: An integer multiple of subframes located in the 16m
zone of the RS frame, where reception from superordinate as well as subordinate station
takes place.
 16m UL Access Zone; An integer multiple of subframes located in the 16m zone of the UL
of the BS frame, where a 16m BS can receive from the 16m MSs.
 16m UL Receive Zone: An integer multiple of subframes located in the 16m zone of the
UL of the 16m BS or RS frame, where a 16m BS or RS can receive from the 16m MSs or
subordinate 16m RS.
 16m Bi-directional Transmit Zone: An integer multiple of subframes located n the 16m
zone of 16m RS frame, where transmission to superordinate as well as subordinate station
take place.
14
Text proposal
15. 1 Frame structure
16m DL Transmit Zone
BS MS
BS MS
BSMS
16m UL
Receive Zone
BS MS
BS RS
Odd-Hop RS
Even-Hop RS
RS  MS
Tx to
Odd-Hop
Superordinate/
Subordinate RS
16m Bidirectional
Transmit Zone
(Tx)
(Tx)
G
A
P
RS MS
G
Odd-Hop RS A
P
Even-Hop RS
16m DL Receive
Zone
16m UL
Transmit Zone
(Rx)
(Tx)
(Rx)
Tx to
Odd-Hop
Superordinate RS
or BS
(Tx)
(Rx)
16m DL Access
Zone
RS MS
(Tx)
Tx to
Even-Hop
Superordinate/Su
bordinate RS
or BS
Rx from
Even-Hop
Superordinate/Su
bordinate RS
or BS
G
A
P
16m Bidirectional
Transmit Zone
16m UL Receive
Zone
16m Bidirectional
Receive Zone
G
A
P
Rx from
Odd-Hop
Superordinate/
Subordinate
RS
16m DL
Transmit Zone
16m Bi-directional Receive Zone
(Rx)
(Rx)

(Tx)

Odd-Hop RS Frame
Structure: Transparent
16m UL
Access Zone
BS RS
(Tx)
Even-Hop RS Frame
Structure: Non-transparent
16m DL
Access Zone
Rx from
Even-Hop
Superordinate RS
or BS
BS Frame Structure
15.1.1 Transparent Relay Frame
Structure (3/3)
There are two coexistence types with
transparent and non-transparent
modes. One is a transparent RS is
superordinate RS of non-transparent
RS (s) and the other is an IEEE
802.16m BS communicates with
transparent RS and non-transparent
RS separately. Figure y-1, and Figure
y-2 show the transparent relay frame
structure supporting the transparent
and non-transparent coexistence.
UL
DL
(Rx)
Figure y.1. FS supporting coexistence modes (Case I)
15
Text proposal
DL
16m DL Transmit Zone
BSMS
BS MS
BS RS
(Tx)
(Tx)
16m DL Access
Zone
16m Bi-directional Receive Zone
G
A
P
(Rx)
16m Bidirectional
Transmit Zone
Tx to
Odd-Hop
Superordinate/
Subordinate RS
16m DL Access
Zone
RS  MS
Even-Hop RS Frame
Structure: Non-transparent
BS MS
16m UL
Receive Zone
BS RS
Rx from
Even-Hop
Superordinate/Su
bordinate RS
or BS
Odd-Hop RS Frame
Structure: Transparent
[The frame structure to support nontransparent multi-hop relay can be
found in 11.4.4.]
BS MS
16m UL
Access Zone
(Tx)
(Tx)
(Rx)
RS MS
(Tx)
(Rx)
RS MS
(Tx)
16m Bidirectional
Transmit Zone
16m UL Access
Zone
RS MS
16m DL Access
Zone
(Rx)
16m UL Access
Zone
RS MS
(Rx)
G
A
P
Tx to
Even-Hop
Superordinate/Su
bordinate RS
or BS
15.1.2 Non-transparent Relay Frame
Structure
16m DL
Access Zone
(Tx)
16m Bidirectional
Receive Zone
Rx from
Odd-Hop
Superordinate/
Subordinate
RS
BS Frame Structure
15. 1 Frame structure
UL
(Rx)
Figure y.2. FS supporting coexistence modes (Case II)
16
Text proposal
15. 2 DL Control Channel(1/2)
Downlink control channel are needed to convey information related to IEEE 802.16m RS
15.2.1 Relay Synchronization Channel (R-SCH)
In transparent mode, the BS can broadcast relay identification-related information such
as RS Cell IDs, the location of the R-SCH, and Relay-USCCH (R-USCCH) position or
relevance-time information, etc
15.2.2 Broadcast Channel
In non-transparent mode, the BS or RS can broadcast the relative position or relevancetime information of R-USCCH in centralized scheduling mode with one or more 16m
subordinate RSs
15.2.3 Unicast Service Control Channels (USCCH)
In transparent mode, USCCH is multiplexed Non-Relay USCCH and Relay-USCCH using
FDM. Relay-USCCH consists of Relay Non-User-specific information and Relay Userspecific information. Relay Non-User-specific information provides the control
information to decode the Relay User-specific information. Relay Non-User-specific
information can indicate relevance time for the location of the resource allocation to
relayed MSs and provide the location of the next Relay Non-User-specific information.
In non-transparent mode, the R-USCCH contains allocation information for the IEEE
802.16m RSs transmitting in the Relay Zone for its subordinate RSs and 16m MSs.
17
Text proposal
15. 3 UL Control Channel
15.3.1 UL Ranging Channel for non-synchronized MS/RS
In transparent relay mode, the IEEE 802.16m UL ranging channel structure can
be reused for uplink synchronization of the non-synchronized MS and RS.
15.3.2 Fast Feedback Channel
For the transparent mode, IEEE 802.16m UL fast feedback channel can be
reused to transmit the channel quality feedback from MS to the 16m RS. For
RS transmission of the channel measurement/quality report to BS, the
additional feedback channel can be defined in the UL relay zone. The details
of UL fast feedback channel for the RS is FFS.
15.3.3 Bandwidth Request
Bandwidth Request Channels for IEEE 802.16m BS and IEEE 802.16m RS can
be separated by code, time and frequency or other resource to distinguish the
BR channels from 16m MS or RS.
18
References
[1] IEEE 802.16m-08/003r5, “The Draft IEEE 802.16m System Description
Document”
[2] IEEE P802.16j/D7, “Draft Amendment to IEEE Standard for Local
and Metropolitan Area Networks: Air Interface for Broadband
Wireless Access Systems Multihop Relay Specification,” Oct. 2008
[3] IEEE C80216m-08_242, “16jm Ad Hoc Group Report”
19