IEEE C80216m-10_0458
Project
IEEE 802.16 Broadband Wireless Access Working Group <http://ieee802.org/16>
Title
Clarification on SA-Preamble partitioning (16.3.6)
Date
Submitted
2010-5-5
Source(s)
Feng Xie, Yanfeng Guan, Zhaohua Lu,
Lin Chen, Huiying Fang，Yang Liu,
Yuqin Chen
ZTE Corporation
Re:
E-mail:
{xie.feng2, guan.yanfeng, lu.zhaohua, chen.lin23,
fang.huiying, liu.yang8, chen.lin23,
chen.yuqin }@zte.com.cn
Call for LB #31a on “ P802.16m/D5”:
Target topic: “16.3.6”
Abstract
This contribution proposes the texts for clarification on SA-preamble partitioning (16.3.6)
Purpose
To be discussed and adopted
Notice
Release
Patent
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IEEE C80216m-10_0458
Clarification on SA-Preamble Partitioning (16.3.6)
Feng Xie, Yanfeng Guan, Zhaohua Lu, Lin Chen, Huiying Fang，Yang Liu, Yuqin Chen
ZTE Corporation
1. Introduction
SA-preamble partitioning needs further clarification to be consistent with the text in femto section
（16.4.7.5）.
In D5, there are two different ways for an AMS to identify and select CSG femto ABSes. AMS can identify
and select a CSG femto ABS with DL channel parameters such as CELL_ID and BS_ID. This way is
preferable since it incurs no UL signaling and thus saves bandwidth and processing power and delay. On the
other hand, Section 16.4.7.5 provides a mechanism for AMS to send its belonging CSGID(s) to CSG femto
ABSs for the accessibility check. This is non-preferable, especially for an AMS in idle mode. Note that CSG
ABS with CSGID should broadcast paging messages for all the AMSs in the paging group because AMS in
idle mode has no way to send UL messages for accessibility check.
There are two ways to remedy the specification. One is to remove the ABS-based accessibility validation
mechanism in Section 16.4.7.5. Alternatively, a mechanism should be provided for AMS to distinguish a
CSG femto ABS with or without CSGID. This approach will have the following advantages:
1) For CSG ABS without CSGID, AMS can quickly judge if the ABS is accessible or not based on DL
channel parameters such as CELL_ID & BSID. Then AMS will not send its belonging CSGID(s) to
those CSG femtos, which evidently reduces the air interface cost. Note that this works well for an AMS
in INE, idle mode and scanning mode.
2) For CSG ABS with CSGID, AMS may need to send its belonging CSGID(s) to those CSG femtos
according to 16.4.7.5 for accessibility check.
2. Text Proposal
In the P802.16m/D5, page 487, line 31, modify as follows:
======================== Start of Proposed Text =====================
SA-Preamble sequences are partitioned and each partition is dedicated to specific base station type like macrocell ABS, Macro
Hotzone ABS, Femto ABS. The base station types are categorized into macro ABS and non-macro ABS cells by hard partition
with 258 sequences (86 sequences per segment * 3 segments) dedicated for macro ABS. The non-macro ABS information is
broadcasted in a hierarchical structure, which composes of S-SFH SP3 and AAI_SCD message. In S-SFH SP3, non-macro ABS
cell type is partitioned as public and CSG femto base stations. Total 16 cases of IDcell partition for public and CSG-femto ABS
are shown in Table 822, which is composed of IDcell partitions based on 30 sequence (10 sequences per segmentation) granularity.
IEEE C80216m-10_0458
For the support of femtocell deployment, a Femto ABS should self-configure the segment or subcarrier set for SA-Preamble
transmission based on the segment information of the overlay macrocell ABS for minimized interference to macrocell if the
Femto ABS is synchronized to macrocell ABSs. The segment information of the overlay macrocell ABS may be obtained by
communications with macrocell ABS through backbone network or active scanning of SA-Preamble transmitted by macrocell
ABS.
For the support of macro, public and CSG femto deployment, if 0<= Idx<= 85, it is reserved for macro ABS, if 86<= Idx<= z, it
belongs to public ABS, and if z + 1 <= Idx<= 255, it belongs to CSG femto ABS, where z is calculated from SA-Preamble
sequence soft partitioning information in S-SFH SP3 IE. The public ABS and CSG femto ABS can use different segments to the
co-located macro ABS. CSG femto ABS can be further restrict to one segment to reduce interference to public ABS. Public ABS
can choose different segment to CSG femto ABS. For example: the public ABS can choose the segment as i = mod((n+1), 3), and
CSG femto can choose the segment as j = mod((n-1), 3) if the co-located macro ABS uses segment n. The IDcellof public ABS
can be 256i + Idx, 86 <= Idx<= z, and that of CSG femto ABS can be 256j + Idx, z + 1 <= Idx<= 255. The public ABS also can
choose the segment as j = mod((n-1), 3) to reduce interference between public ABSs.
The AAI_SCD message provides finer partition information. The non-macro public ABS category can be further divided into
Macro hotzone and OSG femto. The CSG femto category can be further divided into CSG-closed without CSGID, and CSG-open
without CSGID, and CSG femto with CSGID. Relay ARS can be included in either macro ABS partition or Macro hotzone
partition based on deployment.
AAI_SCD includes 4-bit SA_PreamblePartitionforBStype indicator for each partition, which is ordered by the ABS type; macro
hot-zone, OSG femto, CSG-open femto without CSGID, and CSG-closed femto ABSs without CSGID, and CSG femto with
CSGID. Each SA_PreamblePartitionforBStype indicates the last index of preamble sequence of the corresponding ABS type as
shown in Table 823. The range of Macro hot-zone starts from the beginning of non-macro public ABS category. The range of
CSG-open Femto starts from the beginning of CSG femto ABS category. For all other ABS types within either non-macro public
ABS category or CSG femto ABS category, the range of the preamble sequence of the corresponding ABS type starts right after
the last index of the preamble sequence for the previous ABS type in the same category.
============================== End of Proposed Text ===============