1. Network Synchronization Considerations for 802.16n
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2. Network Synchronization Considerations for 802.16n

3. Why Synchronization? (Stating the obvious)
OFDMA networks require synchronization
BS-BS synchronization reduces inter-cell interference and simplifies its mitigation and control
MS synchronization reduces and simplifies mitigation of interference at BS
Both intra-cell and inter-cell

4. Synchronization for Forwarding HR-MS case
HR-MS that are attached to the network (“forwarding” HR-MS) must be synchronized to network as usual
MS-MS links should be synchronized to the network to reduce and simplify management of interference to other MS-MS or to MS-BS links

5. Synchronization for MS-MS communications case
Synchronization of all point to point (P2P) or point to multipoint (P2MP) links in a service area will reduce interference and simplify its management 1

6. Downlink synchronization:
How to synchronize?
Downlink synchronization:
Use e.g. PA-Preamble or similar waveform
Not necessarily at same timing as in m
Uplink synchronization TBD

7. Text proposal (17.3)
Insert in (MS-MS direct communications) and in (HR-MS Forwarding):
Network Synchronization
All HR-MS are synchronized to each other and to an HR-BS if present.
HR-MS transmit PA-Preamble or similar signal to aid in network synchronization.
Network Synchronization
All HR-MS are synchronized to the HR-BS.

8. Text proposal (17.2)
Insert in (MS-MS direct communications) and in (HR-MS Forwarding):
Network Synchronization
All HR-MS are synchronized to each other and to an HR-BS if present.
HR-MS transmit PA-Preamble or similar signal to aid in network synchronization.
Network Synchronization
All HR-MS are synchronized to the HR-BS.
HR-MS transmit P-Preamble or similar signal to aid in network synchronization.