Discussion of 802.16n System Requirements
IEEE 802.16 Presentation Submission Template (Rev. 9)
Document Number:
C802.16gman-10/0011
Date Submitted:
2010-05-05
Source:
Eldad Zeira
E-mail: eldad.zeira@interdigital.com
Interdigital Communications LLC
Re:
Call for contributions: SRD for 802.16n
Purpose:
To be discussed by the SG
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 the “Source(s)” field above. It is offered as a basis for discussion. It is not binding on the contributor(s), who reserve(s) the right to
add, amend or withdraw material contained herein.
Release:
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 802.16.
Patent Policy:
The contributor is familiar with the IEEE-SA Patent Policy and Procedures:
<http://standards.ieee.org/guides/bylaws/sect6-7.html#6> and <http://standards.ieee.org/guides/opman/sect6.html#6.3>.
Further information is located at <http://standards.ieee.org/board/pat/pat-material.html> and <http://standards.ieee.org/board/pat >.
802.16n PAR: Scope1
• This amendment specifies protocol enhancements to the IEEE
802.16 MAC for enabling increased robustness and alternate
radio path establishment in degraded network conditions.
Limited OFDMA PHY extensions are included for enabling
operation with radio path redundancy and direct communication
between subscriber stations. Also mobile base stations and
mobile relay stations are supported. Support for enabling
application specific specialized security suites is also provided.
• With the added note:
• Operation in licensed, unlicensed and lightly licensed spectrum
bands below 6 GHz with means and mechanisms to coexist with
other radio access technologies (RATs) is supported.
1
5/5/2010
See background material for relevant definitions
C80216gman-10/0011
2
M2M may have similar requirements:
• From latest M2M draft SR: 80216ppc-10_0002r5
– Advanced architecture includes MAC/PHY enhancements
to support MS-MS communications (802.16 and non802.16)
– High reliability is required “regardless of operating
environment” and “Device collaboration and
redundant/alternate paths can be obvious ways of
improving reliability”
MNO (Mobile Network Operator)
Access Service
Network
IEEE 802.16
Non M2M
device
IEEE 802.16
M2M device
Connectivity
Service Network
R1
R1
M2M
Server
M2M
Service
Consumer
IEEE
802.16 BS
5/5/2010
Non IEEE
802.16
M2M device
IEEE 802.16
M2M device
IEEE 802.16
M2M device
IEEE 802.16
M2M device
C80216gman-10/0011
R1
R1
3
Scope derived requirements
• “Enabling … alternate radio path
establishment in degraded network conditions,
…, radio path redundancy in degraded
network…”
• “… and direct communication between
subscriber stations”
• “mobile base stations”
• “mobile relay stations”
• “specialized security suites”
5/5/2010
C80216gman-10/0011
4
Breakdown: robustness - what is it?
• “Enabling increased robustness… alternate radio path
establishment in degraded network conditions, …, radio
path redundancy in degraded network…”
• Practical goal: immunity to “Single Point of Failure”
(SPOF)
– Including any network node or radio path to network node or
its backhaul
– MS failure itself out of scope
• Immunity to SPOF achieved as long as deployment is
“dense” enough to provide an alternative path
• Any connection availability probability can be provided
(e.g. 99.9% required for Smart Grid) – it is up to
deployment
5/5/2010
C80216gman-10/0011
5
Robustness – how to provide?
• Without MS support, “Network problem”
– Doesn’t require MS modifications
– One solution already exists but requires very
dense BS deployment
– Other solutions require:
• Specialized nodes (special BS, RS)
• A BS-BS data transfer mechanism
– Topology? (direct, intermediary)
– Protocol structure
– More suitable to extended range applications
with lower latencies (reduces multihops)
5/5/2010
C80216gman-10/0011
6
Robustness – how to provide – cont’d
• With MS-MS direct communication
– No specialized nodes required (all MS nodes are
specialized)
– Fewer bottlenecks
– Issues:
• What is the role of the network, if any?
• Not all MS can see the BS!
• MS-MS direct communication has other uses too
5/5/2010
C80216gman-10/0011
7
Direct communications – what is it?
• “… and direct communication between
subscriber stations”
• Possible uses for direct communication:
–
–
–
–
(robustness – see above)
Coverage extension (coverage holes, robustness)
Traffic aggregation / relaying (M2M?)
Throughput enhancement for local traffic (CE,
others)
• Issues:
– BS / network support & control
– Dependency of BS / network support
5/5/2010
C80216gman-10/0011
8
Topology mapping for MS-MS communications
Requirement
Data rate
BS availability MS autonomy
Multi-hop
relaying
Robustness
Any
Partial
Partial
Required ?
Coverage
extension
Any
Partial
Partial
Optional
Traffic
aggregation /
relaying
Low to
medium
Partial
Partial
Optional
Always
(control only)
Not required
Not required
Localized
Medium to
traffic handling High
5/5/2010
C80216gman-10/0011
9
Mobile BS – what is it?
• mobile base stations
5/5/2010
C80216gman-10/0011
10
Mobile RS – what is it?
• mobile relay
5/5/2010
C80216gman-10/0011
11
Security: what is it?
• specialized security suites
• Existing 802.16m requirements handle only MSBS, BS-RS and MS-RS configurations.
• MS-MS and other topologies, e.g. as required for
network recovery will likely require new
security procedures
5/5/2010
C80216gman-10/0011
12
Background
5/5/2010
C80216gman-10/0011
13
PAR agreed Definitions
Degraded Network
The failure of one or more 802.16 network infrastructure nodes or
network connectivity
Robustness
The capability of the network to withstand and automatically
recover from degradation to provide the required availability to
support mission critical applications (essential to the core function
of society and the economy). E.g. the ability to recover from a
single point of failure
Mobile Base Station A base station which is capable of maintaining service while
moving
Radio Path
Redundancy
5/5/2010
The ability to provide alternative paths between base stations, relay
stations, and subscriber stations
C80216gman-10/0011
14
Other useful definitions
HR-MS
HR-BS
HR-RS
HR-network
Minimal QoS
Radio connectable
5/5/2010
A subscriber station that complies with the requirements
for subscriber stations in this amendment
A base station that complies with the requirements for
base stations in this amendment
A relay that complies with the requirements for relays in
this amendment
A network whose nodes comply with their respective
requirements in this amendment
The combination of data rate, latency and other relevant
parameters that are considered necessary to establish a
radio link
The ability of any two nodes to communicate directly at
a certain minimal QoS
C80216gman-10/0011
15