1. FDD Frame Structure Supporting TDD-based Legacy Systems for P802.16m
S802.16m-08/138
FDD Frame Structure Supporting TDD-based Legacy Systems for P802.16m
Document Number: S802.16m-08/138
Date Submitted:
March 10, 2008
Source:
Pei-Kai Liao , I-Kang Fu, Chih-Yuan Lin, Ciou-Ping Wu and
Paul Cheng
MediaTek Inc. No. 1 Dusing Rd. 1 Hsinchu Science Park Hsinchu City 300 Taiwan.
Venue:
Levi, Finland
Base Contribution:
IEEE C802.16m-08/138
Purpose:
Propose to be discussed and adopted by TGm for the use in Project m SDD.
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2. Introduction Motivation Purpose and Summary
In current systems, TDD duplex mode is the most matured one
There is probably no FDD legacy systems for backward compatibility even though m system supports FDD mode
It is suggested to consider the possibility of FDD frame structure supporting TDD legacy frames
Purpose and Summary
Propose to be discussed and included in C802.16m-08/118r1
FDD frame structure designs supporting TDD legacy frames are proposed for both full-duplex and half-duplex MS operations

3. Full-duplex FDD Frame Structure Supporting TDD Legacy Frames
Time length and channel bandwidths are just for an example
Traditional method requires three bands to accommodate these two systems
Proposed design needs two bands only
16m only band
16m downlink band
One preamble per radio frame
Each permutation zone has its own MAP information

4. Migration Process in the Shared Band
Legacy band
16m uplink band
16m uplink portion is aggregated with legacy uplink one
One switching point required only
Ranging channel or other sync signal is used for synchronization
16m uplink portion grows as legacy users fades out

5. Half-duplex FDD Frame Structure Supporting TDD Legacy Frames
Time length and channel bandwidths are just for an example
Traditional method requires three bands to accommodate these two systems
Proposed design needs two bands only
16 Users are divided into two groups
User group A
User group B
16m only band
16m downlink band
One preamble per radio frame
Each permutation zone has its own MAP information

6. Migration Process in the Shared Band
Legacy portion
16m uplink portion
16m uplink portions of both user groups are aggregated with legacy uplink one
At most three switching points required
Ranging channel or other sync signal is used for synchronization
16m uplink portion grows as legacy users fades out

7. Proposed Text for Full-duplex MS Operation
Details are referred to C802.16m-08/xxx

8. Proposed Text for Half-duplex MS Operation
Details are referred to C802.16m-08/xxx