1. Mesh Topology for Relays
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D. J. Shyy
MITRE
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2. There are two proposals for implementing HR-RS topology within a cell
Introduction
There are two proposals for implementing HR-RS topology within a cell
The topology between an HR-BS and its subordinate HR-RSs within the HR-BS cell is restricted to a tree topology.
The topology for HR-RSs within the HR-BS cell can be a tree or mesh

3. Why are we developing TGn?
Scope: This amendment specifies protocol enhancements to the IEEE medium access control layer (MAC) for enabling increased robustness and alternate radio path establishment in degraded network conditions
Purpose: This amendment addresses higher reliability requirements that are not supported by IEEE Std presently.

4. Two Approaches for Relay Topology
Backwards compatible with 16j and 16m
Higher reliability requirements that are not supported by IEEE Std presently
Enabling increased robustness and alternate radio path establishment in degraded network conditions
Single point of failure
Increased Market for
Tree
Yes No
Weak
MESH
Strong

5. Questions for Tree Topology Proponents
A new standard needs to be developed to have Broad Market Potential (the 1st criterion in 5C)
Why are we wasting time in developing a new standard if the new standard has no significant difference in reliability as compared to previous 16 standards?
We should learn from the history
16j standard was developed, but is there any indication that vendors will implement 16j?
If no vendor implements 16j, why 16j was developed at the first place?

6. Bottom line
The Military and Public Safety often require Mesh communications topologies.  If they can’t be efficiently supported in this standard, then those markets will need to look elsewhere (802.11, LTE, etc) for solutions, and WiMAX market share will shrink even further…

7. Proposed Text for SRD Change
Add HR-RS Mesh Topology
HR-Network shall support mesh topology among HR-RSs within a cell