2003-12-29
Project
IEEE C802.20-04/03
IEEE 802.20 Working Group on Mobile Broadband Wireless Access
<http://grouper.ieee.org/groups/802/20/>
Title
Comments on 802.20 Requirements Document Ver. 10
Date
Submitted
2003-12-29
Source(s)
Hao Hu
Voice: +86-10-82882735
Huawei Technologies Co., Ltd.
Fax:
+86-10-82882940
Email: huahoby@huawei.com
Bingyu Qu
Voice: +86-10-82882755
Huawei Technologies Co., Ltd.
Fax:
+86-10-82882940
Email: qubingyu@huawei.com
Re:
MBWA Call for Contributions: Session # 6 - January 12-16, 2004 Vancouver
Abstract
This contribution provides some comments on 802.20 Requirements Document Version
10. A change in the “Quality of Service and MAC” section and a new requirement for
MAC are proposed.
Purpose
Contribute to the development of the 802.20 Requirements Document. Requested to
discuss and approve these comments.
Release
This document has been prepared to assist the IEEE 802.20 Working Group. It is offered as a basis for
discussion and is not binding on the contributing individual(s) or organization(s). The material in this
document is subject to change in form and content after further study. The contributor(s) reserve(s) the right
to add, amend or withdraw material contained herein.
The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this
contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in
the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution;
and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE
Standards publication. The contributor also acknowledges and accepts that this contribution may be made
public by IEEE 802.20.
Patent
Policy
The contributor is familiar with IEEE patent policy, as outlined in Section 6.3 of the IEEE-SA Standards
Board Operations Manual <http://standards.ieee.org/guides/opman/sect6.html#6.3> and in Understanding
Patent Issues During IEEE Standards Development <http://standards.ieee.org/board/pat/guide.html>.
Notice
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2003-12-29
IEEE C802.20-04/03
Comments on 802.20 Requirements Document
Version 10
1 Purpose
This document contributes to the development of the 802.20 Requirements Document.
2 Scope
This contribution focuses on the change in 4.4.1 “Quality of Service and MAC” section
and on a new requirement for Layer 2 MAC (Media Access Control).
3 Change
This change is proposed to calibrate some inconsistency between the current SRD Ver.10
in 4.4.1 “Quality of Service and MAC” and RFC. Please note the red part of the
following section

4.4.1 Quality of Service and the MAC
Current Text:
"……
Some of the forwarding behaviors that should be supported by 802.20 include: Expedited
Forewarding (EF), Assured Forwarding (AF), and Best Effort (BE) DS per Hop
Behaviors (HPBs) as defined by the RFC 2597 and RFC 2598.
……
"
Proposed Text:
" ……
Some of the forwarding behaviors that should be supported by 802.20 include: Expedited
Forewarding (EF), Assured Forwarding (AF), and Best Effort (BE) DS per Hop
Behaviors (HPBs) as defined by the RFC 2597 and RFC 3246.
……
"
Rationale:
The RFC 2598 is obsolete and replaced by RFC 3246 in IETF. The new RFC 3246 adds
mathematical formalism to give a more rigorous definition of the behavior described.
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4 Comments
This part describes a new requirement in 4.4 “Layer 2 MAC (Media Access Control)”
section.

4.4.2 Support for PHY Layer
Proposed text
802.20 MAC protocol shall have the ability of supporting several duplexing techniques
and different block assignments of system bandwidth.
Rationale
The AI shall support several duplexing techniques (i.e. FDD and TDD) and the
different block assignments, which have been specified respectively in the SRD
version 10. But the different physical layer technologies or block assignments may
require different MAC layer schemes.
If a MAC protocol is only designed for one of physical technologies or block
assignments, more MAC protocols have to be specified. This may be costly and
unworthy.
In fact, the choice of duplexing technique or block assignments may affect certain
PHY parameters as well as impact the features that can be supported. And different
block sizes information correlative with block assignments may be informed to higher
layer above MAC through the primitives between them. So a MAC protocol with
several sets of PHY parameters may be an easy and possible best solution for MBWA
AI.
This key point is not clearly specified in 802.20 SRD V10. So I suggest that only one
MAC protocol shall be exist for MBWA air interface, which shall be pointed out
explicitly in SRD. Different physical technologies or block assignments can be
supported by MAC through assigning corresponding parameter sets.
For example, MAC has several sets of parameters. Each set may be used to a certain
kind of block assignment (such as 5M or 10M bandwidth etc.) and duplexing technique,
which is shown in the table below.
Set number
1
2
3
4
5
...
PHY parameter
FDD 5M etc.
FDD 10M etc.
FDD 20M etc.
FDD 40M etc.
TDD 2.5M etc.
…
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IEEE C802.20-04/03
When parameter set 1 is used, MAC shall notice the PHY that the parameters related to
FDD duplexing technique and 5M bandwidth are to be used.
4