C80216m-08_071r1
Universal Control Channel for IEEE 802.16m System
Document Number:
IEEE S802.16m-08/071r1
Date Submitted:
2008-01-21
Source:
Kanchei (Ken) Loa, Shiann-Tsong Sheu, Tsung-Yu Tsai,
Yung-Ting Lee, Youn-Tai Lee, Yi-Hsueh Tsai, Hua-Chiang Yin
Institute for Information Industry (III)
7F, No. 133, Sec. 4, Minsheng E. Rd., Taipei City 105, Taiwan
Voice:
E-mail:
+886-2-6600-0100
loa@iii.org.tw
Yang-Han Lee, Yih G. Jan
Tamkang University
Re:
IEEE 802.16m-07/047– Call for Contribution on Project 802.16m System Description Document (SDD) for topic “Proposed IEEE 802.16m Reference Model and
Potential System Architectures”
Abstract:
Universal control channel and network architecture proposal for IEEE 802.16m systems
Purpose:
For discussion and approval by IEEE 802.16 Working Group (Consideration of universal control channel for IEEE 802.16m systems)
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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contribution may be made public by IEEE 802.16.
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Outline
• Appreciable imperfections in current 802.16e/j
standard
• Concept of using universal control channel in
16m system
• Two examples of using universal control channel
in 16m system
• IEEE 802.16m protocol structure to support
universal control channel
• Conclusions
2
Motivations
• In the current 802.16e/j system, the evident
disadvantages are twofold:
– overheads of UL control signals, and
– appreciable delay of control messages.
• The 802.16m system shall support high speed
mobility and broadband access, and may deploy relay
stations. The design faces the issues of
– frequent handover,
– multi-hop relaying, etc.
• To curb the performance inefficiency on bandwidth
consumption and delay, we propose to allocate the
universal control (UC) channel(s) for 802.16m system.
3
Usage Scenarios of UC Channel
• The universal control channel facilitates the efficient
transmissions of controls signals in both directions :
– Up-Link
•
•
•
•
•
•
•
•
HARQ ACK/NAK report
CQI report
DL Congestion/Flow control
Ranging and synchronization
Bandwidth request
Handover (MS/RS initiated)
Location Update
Cooperative diversity and MIMO, etc.
– Down-Link
•
•
•
•
Handover (BS initiated)
UL Power control
UL Congestion/Flow control
Paging and Traffic indication, etc.
4
Transmission Technology
• UC channel shall have the characteristics:
– Anti-interference
– Low data rate
– Controllable power spectrum density
5
Coverage Area
• Coverage Area of UC channel could be as large as
– Cell coverage area,
– Cell-Group coverage area.
BS/RS
BS/RS
RS
BS/RS
RS
BS/RS
BS/RS
RS
BS
BS/RS
RS
BS/RS
RS
RS
BS cell or RS cell
Coverage area of
data signals
Cell-wise UC channel
Coverage area of
control signals
Cell-Group-wise UC channel 6
UC Channel Operation Mode
• UC channel could be operated in
– FDD mode
– TDD mode
7
Example of Carrying UL HARQ ACK/NACK
Signal over UC Channel
• For DL HARQ bursts, the HARQ ACK/NACK signal can
be transmitted either from MS/RS to BS directly or from
MS to BS via lesser RSs in multi-hop system with relays.
BS
RS HARQ
ACK report
MS HARQ
ACK report
2-hop HARQ Burst
1-hop HARQ ACK
MS
2-hop DL
HARQ
Burst
RS
RS overhears control
signals from MS
OFDMA
channel
UC
channel
8
Benefit of Carrying CQI Report over UC
Channel
• For an MS, the CQI report can be transmitted either from
MS/RS to BS directly or from MS to BS via lesser RSs in
the multi-hop system with relays.
BS
RS CQI
report
2-hop DL
Burst
MS CQI
report
1-hop CQI Report
MS
RS
RS overhears control
signals from MS
OFDMA
channel
UC
channel
9
IEEE 802.16m Reference Model and Protocol Stack
• Based on C80216m-07/299r3, interface R1’u is added for supporting
UC channel.
10
IEEE 802.16m Protocol Structure to Support
UC Channel
• We amend the protocol structure depicted in C80216m-07_297 and
C80216m-07_301 to support UC channel among BS, RS and MS.
Network Layer
Radio Resource
Management
Routing
Location
management
System
configuration
management
Multi-Carrier
Support
Mobility
Management
Idle Mode
Management
MBS
SelfOrganization
Network-entry
Management
Security
management
Connection
Management
MAC Common Part Sublayer
Data
Forwarding
Scheduling and
Resource
Multiplexing
Multi-Radio
Coexistence
Interference
management
Sleep Mode
Management
(CQI, HARQ,
power control,
UC Channel)
ARQ
QoS
Fragmentation/Packing
PHY control Link Adaptation
Ranging
Convergence Sublayer
Control
Signaling
MAC PDU formation
Encryption
Control Plane
Data Plane
UC Channel
PHY 1
PHY 2
Physical Layer
11
IEEE 802.16m MS/BS Control Plane
Processing Flow
Network Layer
System
configuration
management
Routing
Radio Resource
Management
Location
management
Multi-Carrier
Support
Mobility
Management
Idle Mode
Management
MBS
SelfOrganization
Network-entry
Management
Security
management
Connection
Management
Convergence Sublayer
MAC Common Part Sublayer (Resource Control and Management Fnuction)
ARQ
MAC Common Part Sublayer (Hop-by-hop or End-to-end Fnuction)
Data
Forwarding
Scheduling and
Resource
Multiplexing
Sleep Mode
Management
PHY control
Multi-Radio
Coexistence
Interference
management
Ranging
Link Adaptation
(CQI, HARQ,
power control,
UC Channel)
QoS
MAC PDU formation
Control
Signaling
Encryption
Data Plane
Control Plane
UC Channel
Fragmentation/Packing
PHY 1
PHY 2
Physical Layer
12
Conclusions
• UC channel is proposed to assist 16m system with or
without relays to achieve
– fast UL request and information report, and
– fast DL command
• A proper UC channel design provides superior
– coverage area,
– power spectrum density and
– robustness
• Further study:
– Interference between UC channel and 16m OFDMA channel
13