1. Discussion of 802.16n System Requirements
IEEE Presentation Submission Template (Rev. 9)
Document Number:
C802.16gman-10/0011r2
Date Submitted:
Source:
Eldad Zeira
Interdigital Communications LLC
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Call for contributions: SRD for n
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To be discussed by the SG
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2. 802.16n PAR: Scope1
This amendment specifies protocol enhancements to the IEEE 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 See background material for relevant definitions
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3. M2M may have similar requirements:
From latest M2M draft SR: 80216ppc-10_0002r6
In advanced architecture “peer-to-peer (P2P) connectivity between IEEE M2M devices may also be supported”
High reliability is required “regardless of operating environment” and “device collaboration and redundant and/or alternate paths are indirect methods of improving reliability”
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4. 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”
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5. 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
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6. Robustness – how to provide?
Re-scan: an existing solution that requires a very dense BS deployment
Without MS support, “Network Solution”
No MS modifications
Other solutions require:
A BS-BS data transfer mechanism
Topology? (direct, intermediary), Infrastructure node density
Protocol structure
Specialized nodes (special BS, RS)
More suitable to extended range applications with lower latencies (reduces number of hops)
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7. 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 any BS!
MS-MS direct communication has other uses too
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8. HR-Network robustness examples
BS (1) has lost its backhaul, can now convey user data to another BS directly (2) or through relay (3).
MS (4) and (5) lost communication with serving BS, now using other MS to connect
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9. 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
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10. Topology mapping for MS-MS communications
Requirement
Data rate
BS availability
MS autonomy
Multi-hop relaying
Robustness
Any
Partial
Required ?
Coverage extension
Optional
Traffic aggregation / relaying
Low to medium
Localized traffic handling
Medium to High
Always (control only)
Not required
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11. Illustration of MS-MS topologies
(1) M6 and M7 transfer data directly while being both
connected to a base station;
(2) M4 cannot receive the BS, receives its data through M5 in an
MS-MS-BS configuration;
(3) M3 receives its data through M2, M1 and the relay HR-RS
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12. specialized security suites
Security: what is it?
specialized security suites
Existing m requirements handle only MS-BS, BS-RS and MS-RS configurations.
MS-MS and other topologies, e.g. as required for network recovery will likely require new security procedures
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13. Mobile BS – what is it? mobile base stations 5/5/2010
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14. Mobile RS – what is it?
mobile relay
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15. Background
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16. PAR agreed Definitions
Degraded Network
The failure of one or more 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
The ability to provide alternative paths between base stations, relay stations, and subscriber stations
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17. Other useful definitions
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 nodes comply with their respective requirements in this amendment
Minimal QoS
The combination of data rate, latency and other relevant parameters that are considered necessary to establish a radio link
Radio connectable
The ability of any two nodes to communicate directly at a certain minimal QoS
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