Macro Diversity for E-MSB
IEEE 802.16 Presentation Submission Template (Rev. 9)
Document Number:
IEEE S802.16m-08/981r1
Date Submitted:
2008-09-12
Source:
Torsten Fahldieck
Voice: +49-711-821-32163
Email: torsten.fahldieck@alcatel-lucent.de
Alcatel-Lucent
Venue:
[802.16m] [16jm] Session #57, 16.-19. September, 2008
Base Contribution:
IEEE C802.16m-08/981r1
Purpose:
To propose Macro Diversity for E-MSB
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
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contained herein.
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Macro diversity for E-MBS
Content
•
•
•
•
Problem Description
Solution
Requirements
Principle
2
Problem Description
•
Issue:
– MS#1, MS#2, MS#3, … MS#n build one multicast group
– All MS’s except MS#3 are located close to BS1 with good channel conditions
– MS#3 is located at cell edge with poor channel conditions
•
Consequence:
– Multicast group has to use robust coding scheme with huge resource
consumption
Coverage 1
MS
#1
BS 1
MS
#3
MS
#n
MS
#2
3
Solution
Macro diversity for E-MBS
•
Terminal receives signal from 2 (or more) BS
•
•
•
•
Better receive signal strength due to signal combining
Less resource usage due to better coding scheme for the whole MBS group
No need for regular handover for MBS connections (same connection parameters)
Example:
–
–
MS#3 perform signal combining from BS1 and BS2
Better SINR, more efficient coding scheme, less resource consumption, for the whole MBS group
MS#1, MS#2, MS#3,.. MS#n
Main issues for macro diversity
•
•
How to provide synchronous MSB transmission?
How to ensure that each BS autonomously schedules identical MBS bursts?
Coverage 2
Coverage 1
MS
#1
BS 1
BS 2
MS
#3
MS
#n
MS
#2
4
Requirements for synchronized MBS
•
•
•
DL frame incorporates MBS portion at same position (subchannel,
symbol)
MBS portions have identical size
Structure and content of MBS portions have to be identical
– Same amount of bursts
•
•
•
•
Same modulation and coding
Bursts located at same position (subchannel, symbol)
Bursts have same size
Bursts contains same MAC PDU’s
– MAC PDU’s contains same data
– For keeping the structure of the MBS portion simple, the bursts inside the
MBS portion are placed in an ordered list
Symbols
Downlink Frame
Burst
#1
Subchannels
Burst
#2
Burst
#n
Burst
#...
MBS Portion
5
Synchronized MBS Transmition
•
•
•
•
•
1/2
BS#1–n form a E-MBS domain
One E-MBS domain is controlled by one E-MBS server via network interface
E-MBS server is a functional entity inside the Network Control and Management System
E-MBS server broadcasts/multicasts MBS flows coming from the core network to all BS in the
domain (data-plane)
E-MBS server send control messages to all BS in the domain to enable synchronized MBS
downlink transfer (control-plane)
NCMS
S
MB
MBS Flow
E-MBS
Server
ta
Da
Functional
Entity
ata
BS #2
low
SF
MB
MBS Flow
MB
SF
low
BS #n
low
SF
MB
MBS Flow
MB
SF
low
w
Flo
MBS Data Flow
MB
SD
BS #1
low
SF
MB
MBS Flow
MB
SF
low
Flo
w
Physical
Ently
6
Synchronized MBS Transmission 2/2
•
•
•
•
MBS servers send E-MBS control messages to all BS in its administrative
domain
E-MBS control messages force the individual running scheduler to generate
identical MBS portions
MBS portions is a reserved area in the downlink containing all E-MBS bursts
E-MBS server sends control messages (not mandatory on every frame)
–
–
Initiation
Changes on MBS flow(s)
•
Create, change, delete, bandwidth change
BS #1
B
E-M
MBS Flow
E-MBS
Server
o
SC
lM
ntro
sg
E-MBS Control Msg
EMB
SC
on
tro
l
Ms
BS #2
g
BS #n
7
MBS-Portion Synchronization
MBS Ctrl Msg #x
MBS Portion
MBS Ctrl Msg #x+1
MBS Portion
MBS Ctrl Msg #x+2
MBS Portion
MBS Portion
BS 1
Synchronous
transmition
DL Frame #n
MBS Portion
DL Frame #n+1
MBS Portion
DL Frame #n+m
MBS Portion
DL Frame #n+x
MBS Portion
BS 2
DL Frame #n
MBS Connection x
MBS Connection y
other MBS Connections
DL Frame #n+1
DL Frame #n+m
BS1 and BS2 are members of the same E-MBS domain
DL Frame #n+x
8
Information in MBS Control Messages
•
•
•
•
Position and size of MBS portion
Frame number
Time stamps
Information about bursts (carried in the MBS Portion)
– Ordered burst list
– For each burst:
• Max size
• Associated parameters (Modulation, Coding…)
• Ordered list of connection identifiers
– Connection identifiers (carried in a MBS Burst)
• For each Connection identifiers :
– IP Classifier: MBS Packet ->MCID mapping rule
– Security Association
• Fragmentation and packing parameters
• Max / min PDU/SDU size …
9
Text proposal
Insert the following text into SDD (IEEE 802.16m-08/003r4) section 15.x.x. –
15.x.x. Macro diversity for E-MBS
An E-MBS zone is an administrative domain controlled by an E-MBS server. The E-MBS server
is a functional entity inside the Network Control and Management System (NCMS). Within one
E-MBS zone, basestations are able to transmit MSB data in a synchronized manner, which give
the receiving terminals the opportunity to perform signal combining. The E-MBS server sends
control messages to all basestations in its MBS zone. These control messages contain
unambiguous information, which enable the individual running basestations to generate
synchronized MSB portions. An MBS portion is an area in a downlink frames, which is
exclusively reserved for MBS connections.
10