Persistent Allocation Signaling Messages
IEEE 802.16 Presentation Submission Template (Rev. 9)
Document Number:
IEEE S802.16maint-08/010r2
Date Submitted:
2008-01-14
Source:
Suresh Kalyanasundaram, Anand Bedekar, Steven Xu, Hua Xu
Motorola, Inc.
Venue:
Working group letter ballot recirc #26a, IEEE P802.16Rev2/D2
Base Contribution:
IEEE C802.16maint-08/010r2
Purpose:
Review and adapt
Notice:
E-mail:
hua.xu@motorola.com
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Persistent Allocation and De-Allocation
Signaling
• The persistent allocation and de-allocation can be conveyed
via broadcast MAC management messages like DL-MAP or
primary management MAC management messages
• Challenges of using DL/UL-MAP message
– Additional ACK procedure need to be defined, implicit or explicit, to
ensure the reliable communication of persistent scheduling
assignment/termination
– Submaps are needed in order to use proper MCS for the DL/UL-MAP
message transmission
– Lack of coding benefit from Chase or IR
• Benefits of using primary management MAC management
messages
– Naturally have the ACK procedure and proper MCS usage in place due
to the use of HARQ. Neither standard changes nor extra developments
are needed.
– Additional coding benefit for the signaling message due to the use of
HARQ with Chase or IR
Summary of Benefit
• Due to the “persistency” nature, the allocation and deallocation signaling is expected to be none frequent
(~1/sec/flow) and on individual user bases, like call
setup. Individual message is more proper for this
use rather than the frame by frame(5ms) broadcast
DL/UL-MAP.
• Use primary management MAC management
message for persistent scheduling assignment/
termination requires less standard changes than
DL/UL-MAP to achieve the equivalent performance.
• The standard change needed is simple and straight
forward
• Less development changes
Reliable Persistent Allocation Signaling
Procedure
Persistent
Schedule
VoIP
Burst#2
VoIP
Burst#3
VoIP
Burst# n
VoIP signaling
Burst#1
Ack for persistent
schedule signaling
is received here
•
Persistent schedule signaling message is sent with HARQ reliability
– New MAC management messages need to be standardized for persistent schedule
signaling messages
•
Persistent schedule (DL and/or UL) is used by the BS only after it receives ACK
from the MS
– BS retransmits persistent schedule signaling information as per existing HARQ/ARQ
schemes
•
•
No additional delay because the BS (MS) can continue to send VoIP bursts with
dynamic scheduling using DL-MAP (UL-MAP)
MS continues to read DL-MAP (UL-MAP) even after persistent schedule is
enforced for reading changes, termination, etc. of the persistent schedule
Signaling of Persistent Scheduling
• Introduce two new MAC management messages as MAC management
message type 70 and 71.
– DL-PSIS-MAP message
– UL-PSIS-MAP message
• Use the Persistent DL HARQ Chase Subburst IE as specified in the
baseline proposal, which includes content, such as
–
–
–
–
–
–
–
–
Periodicity,
Start time,
Expiry,
Allocation de-allocation flag,
Periodic allocation id,
ACID,
MCS,
etc.
• Same procedure applies to DL and UL, assignment and termination of
persistent scheduling
Persistent Allocation Change
• Allocation change needed during the persistent scheduling
period can be signaled using broadcast DL-MAP message so it
is conveyed in a timely fashion (frame by frame)
• The allocation that is changed to can be specified using
modified HARQ DL MAP IE with newly defined persistent
DL HARQ Chase Subburst IE
• The allocation change can be permanent or temporary.
• The allocation change can be replacement or supplement
• A 2 bit change_type field is introduced in the DL HARQ
Chase Subburst IE to indicate different change types