IEEE C802.16gman-10/0048
Project
IEEE 802.16 Broadband Wireless Access Working Group <http://ieee802.org/16>
Title
System Architecture Reference Model in 802.16n
Date
Submitted
2010-11-01
Source(s)
Hung-Yu Wei, Ching-Chun Chou,
E-mail: hywei@cc.ee.ntu.edu.tw
National Taiwan University (NTU)
E-mail: zhengyanxiu@itri.org.tw
Yan-Xiu Zheng
*<http://standards.ieee.org/faqs/affiliationFAQ.html>
ITRI
Re:
CfC: IEEE P802.16n SRD in GRIDMAN TG
Abstract
This is a contribution for the SARM in annex to 802.16n SRD.
Purpose
To be discussed and included in the GRIDMAN SRD
Notice
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<http://standards.ieee.org/board/pat>.
System Architecture Reference Model in 802.16n
Hung-Yu Wei, Ching-Chun Chou
National Taiwan University
Introduction
The IEEE 802.16n standard aims to provide high reliability and disconnection immunity network service.
SPOF should be avoided and two-way communication be ensured. Therefore, some specific definitions are set
in the current SRD [1]:
HR-MS: A subscriber station that complies with the requirements for subscriber stations in this amendment
HR-BS: A base station that complies with the requirements for base stations in this amendment
HR-RS: A relay that complies with the requirements for relays in this amendment
HR-network: A network whose stations comply with their respective HR requirements in this amendment
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HR-station: An HR-MS, HR-BS or HR-RS.
Infrastructure station: An HR-BS or HR-RS
A solid system model should be provided to capture the system characteristics and serve as annex to
SRD. The figure below is the proposed System Architecture Reference Model (SARM).
HR-Network
Infrastructure Station
①
②
HR-MS
⑤
HR-RS
③
HR-RS
⑥
④
HR-MS
HR-RS
⑦
HR-BS
⑧
HR-RS
HR-BS
⑨
⑪
Backhaul
Network
⑩
MS
RS
RS
BS
MS
RS
RS
BS
Non-HR-Network
: Solid lines represent possible wireless links between entities
: Dashed lines represents there may be 0, 1, or multiple links between the entities.
For example, there may be 0, 1, or multiple RS between the MS and BS, so the links is drawn as
dashed.
: Lines with arrows mean special operation. The HR-MS may switch to HR-RS or HR-BS mode.
HR-network may be composed of multiple sets of HR-BS, HR-RS, and HR-MS. As multi-hop relay is
allowed in SRD section 6.1.2.2, the connection between HR-BS and HR-MS may be established through 0 or
more HR-RS, presented using dashed lines. Besides, as multi-path routing and link redundancy is provided in
[2], links between HR-RS and HR-MS should be allowed. Therefore each HR-MS may access multiple HR-RS
under the same or different HR-BS. HR-RS may also access each other or multiple HR-BS. HR-BS may also
connect itself to each other.
Since the SRD [1] allows HR-MS to operate in BS or RS mode, the operation should also be specified in
the SARM. Therefore, the link between HR-MS and HR-RS, HR-BS are presented using arrow lines. In
addition, connection between HR-MSs are established when infrastructure stations are absent, presented as
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IEEE C802.16gman-10/0048
dashed lines.
It is possible that non-HR stations may also exist in the environment. They are presented as MS, RS, and
BS. Non-HR MS should be able to connect to HR-RS or HR-BS, and HR-MS may also access RS or BS. HRRS may also connect to BS, and RS to HR-BS.
We present the meaning of each numbered links as follows:
① : The link between HR-MS and HR-BS, arrowed lines.
This shows that the HR-MS may switch to HR-BS mode, and may switch back to HR-MS.
② : The link between HR-MS and HR-RS, arrowed lines.
This shows that the HR-MS may switch to HR-RS mode, and may switch back to HR-MS.
③ : The links between HR-MS and HR-RS under different HR-BS, arrowed lines.
This shows that multi-path connection is allowed in 802.16p. HR-MS may connect to different HR-MS under
distinct HR-BS. As HR-RS mode is still allowed, arrow line is used on the link.
④ : The links between different HR-RS and HR-BS, dashed lines.
This shows that multi-path connection between HR-RS and HR-BS is allowed in 802.16p. Dashed line shows
that there may be multiple HR-RSs.
⑤ : The links between HR-MS, dashed lines.
This shows the inter-connection capability of HR-MS. As 802.16p specifies that HR-MS may connect to each
other in case of no infrastructure station, this link should also be drawn in the SARM. As multiple HS-MS
may connect to each other and form a network themselves, this line is drawn in dashed line.
⑥ : The links between HR-BS, dashed lines.
This shows that HR-BS may connect to each other to form a more reliable network, as specified in 802.16p
SRD. As multiple HR-BS may connect to each other, dashed line is used.
⑦ : The link between non-HR MS and HR-RS.
This shows that normal MS, maybe an 802.16m MS, may connect to a HR-RS. Therefore it is presented as
solid line.
⑧ : The link between HR-MS and non-HR RS.
This shows that HR-MS, defined in 802.16n, may access and connect to a non-HR RS, which may be an
802.16m RS. In this case, RS mode is not allowed. Therefore solid line is used.
⑨ : The link between non-HR RS and HR-BS
This shows that non-HR RS may still connect to an HR-BS. For example, an 802.16m RS may connect to an
802.16n HR-BS, without using any HR functions. Solid line is used to demonstrate the link.
⑩ : The link between HR-RS and non-HR BS
This shows that HR-RS may connect to a non-HR BS. In this case, HR-RS should work as a normal RS, in
order to operate under non-HR scenarios. Solid line is used for the link between HR-RS and non-HR BS.
⑪ : The link between HR-RS and non-HR RS
This shows that the HR-RS and non-HR RS may connect to each other, serving as intermediate relay
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IEEE C802.16gman-10/0048
stations between MS&BS, MS&HR-BS, HR-MS&BS, or HR-MS&HR-BS. If non-HR RS is introduced in
the relay links, HR functions should be disabled, because necessary HR protocol may not function between
HR-RS and non-HR RS.
Proposed Resolution
Adopt the SARM figure presented above.
References
[1] C802.16gman-10/0038r1, “(Draft) 802.16n System Requirements Document,” GRIDMAN TG, 2010-09-16
[2] C802.16gman-10/0024r1, “Working Draft for 802.16n System Requirements Document,” EPRI, 2010-07-27
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