Transcript IEEE C802.16m-09/1902

Text Proposal of SA-Preamble Partition in IEEE 802.16m/D1 (15.3.6.1.2)
Document Number: S80216m-09/1902
Date Submitted: 2009-08-30
Source:
Yu-Hao Chang, Yih-Shen Chen, Pei-Kai Liao
Chih-Yuan Lin, Paul Cheng
MediaTek
[email protected], [email protected]
Venue:
IEEE Session #63, Jeju, Korea.
Re: Letter Ballot #30 on the Draft Amendment (IEEE P802.16m/D1)
Base Contribution:
N/A
Purpose:
To be discussed and adopted by TGm for the 802.16m amendment
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Motivation
▪ Different types of ABS, such as macro-BS, hot zone BS, relay and
femto, are all employed to satisfy various demands from different
users in different area
▪ Each ABS carries an unique SA-Preamble sequence as its identity
▪ SA-Preamble set is divided into several non-overlapped subsets,
each of which is reserved for different ABS types
▪ If SA-Preamble partition information is carried in SFH, AMS can
select the preferred ABS type once it decodes the SFH without
referring to the higher layer message, such as MAC message, to
reduce network entry or handover latency
▪ The SA-Preamble partition should be flexible, depending on the
deployment scenario, and the partition information should be
passed to AMS without much signaling overhead
SA-Preamble Sequences in 802.16m
▪ According to the resolution of #474 comment in the Session 62nd
meeting, 768 SA-Preamble sequences is divided into three
segments, each of which contains 256 sequences
▪ For each segment, only half of 256 sequences are explicitly shown
in IEEE C802.16m-09/1478r3. This is because the other 128
sequences can be generated by flipping and conjugating of the
previous 128 codes
▪ Our partition method is applied to all three segment
Proposed SA-Preamble Partition Table (1/3)
▪ For each SA-Preamble segment, we first make a hard cut between
macro ABS and non-macro ABS cell ID sets
– The total number of cell ID supported for macro ABS is
[120(=20*2*3)]
•Only 114 cell ID in 802.16e
– The size of macro/non-macro BS sets is fixed and is known to
AMS
– No feedback is needed for the hard partition size
Cell ID partition table
Macro BS
[20 pairs]
Non-macro BS
[108 pairs]
Hard Partition
Soft Partition
Proposed SA-Preamble Partition Table (2/3)
▪
For the non-macro ABS cell ID set, we further divided it into three different
partitions, namely, hot zone, relay, femto (including both OSG and CSG)
Macro BS
Hot Zone
Relay
Soft Partition
Hard Partition
▪
Femto
A [3]-bit index broadcasted in S-SFH is used to indicate the size of these
three partitions as below
– The total size of soft partition is [108] pairs
Index
HotZone
Relay
Femto
0b000
1/12
3/12
8/12
0b001
3/12
1/12
8/12
0b010
2/12
2/12
8/12
0b011
2/12
3/12
7/12
0b100
3/12
2/12
7/12
0b101
3/12
3/12
6/12
0b110
2/12
4/12
6/12
0b111
4/12
2/12
6/12
Proposed SA-Preamble Partition Table (3/3)
▪
For the Femto partition, we further divided it into three different subsets,
namely, OSG, CSG open and CSG close.
▪
We pre-allocate different size to different femto type, i.e., [16] pairs in
OSG femto, [16] pairs in CSG Open femto and the rest pairs for CSG
Close femto
▪
Two [4]-bit pointers, whose value is between [-8~7] is used to adjust the
size of OSG and CSG Open femto
– Max. size of OSG/CSG Open femto is [23] pairs
– Min. size of OSG/CSG Open femto is [8] pairs
▪
The information of these two pointers is broadcasted in AAI_SCD
4-bit partition
pointer
Macro BS
Hard Partition
Hot Zone
Relay
OSG Femto
Soft Partition
4-bit partition
pointer
CSG Close
Femto
CSG Open
Femto
Text Proposal (1/2)
▪ Modify the following text in line 9 of Page 288
– SA-Preamble sequences are partitioned and each partition is
dedicated to specific base station type like Macromacrocell BS,
FemtoMacro Hotzone BS, femtocell BS and etc. The partition
information is broadcasted in the extended system information.
Within each SA-Preamble segment, the first [40] SA-Preamble
sequences are reserved for macro-BS and the rest of [216]
sequences are for Macro Hotzone, Relay, and femto. The size of
Macro Hotzone, Relay, and femto is controlled by a [3]-bit index
specified in Table xxx. The value of index is broadcasted in S-SFH.
In addition, Femto partition can be further divided into three parts,
namely, OSG, CSG Open and CSG Close femtos. The size of each
partition is signaled by two [4]-bit pointers, whose values are
signaled in AAI_SCD.
Text Proposal (2/2)
▪ Insert the following table after the second paragraph of Page 288
Table xxx-Soft partition of SA-Preamble
Index
HotZone
Relay
Femto
0b000
1/12
3/12
8/12
0b001
3/12
1/12
8/12
0b010
2/12
2/12
8/12
0b011
2/12
3/12
7/12
0b100
3/12
2/12
7/12
0b101
3/12
3/12
6/12
0b110
2/12
4/12
6/12
0b111
4/12
2/12
6/12