Relative Timing of Super-Frames in the Legacy-Support Mode

IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number:

IEEE S802.16m-08/244Date Submitted:

2008-03-17Source:

Sungho Moon and Jin Sam KwakVoice: +82-31-450-1852

LG Electronic Inc. E-mail: msungho@lge.com, samji@lge.com, LG R&D Complex, 533 Hogye-1dong, Dongan-gu, Anyang, 431-749, Korea*<http://standards.ieee.org/faqs/affiliationFAQ.html>

Venue:Re : Proposed 802.16m Frame Structure Baseline Content Suitable for Use in the 802.16m SDD (C802.16m-08/118r1)

Base Contribution:IEEE C802.16m-08/244

Purpose:Proposed 802.16m Frame Structure Baseline Content Suitable for Use in the 802.16m SDD (C802.16m-08/118r1)

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Introduction

• DL to UL Ratio– Should be aligned between adjacent cells

– Static configuration

• Mixed Ratio between 16e and 16m Sub-Frames– Can be different between adjacent cells

– Dynamic and semi-static according to 16e and 16m loading

• Current Relative Timing btw. 16e and 16m Frames– Variable relative timing

– Different starting point of 16m super-frame according to the mixed ratio between 16e and 16m sub-frames• During handover procedures, there may be ambiguity problem in

synchronization and acquisition of broadcasting information which should be located at the first sub-frame in 16m super-frame.

Variable Relative Timing

TDD DL Frame

Sub-Frame

DL DLDL DL16e : 16m = 4 : 1

DL Sub-Frame for Legacy (16e) DL Sub-Frame for 16m

TDD UL Frame

16e : 16m = 3 : 2

16e : 16m = 2 : 3

16e : 16m = 1 : 4

Frame_OFFSET

DL

DL DL

Super-Frame Header (SFH)

DL DLDL DLDL

DL DL DLDLDL

DL DLDLDLDL

Frame_OFFSET

Frame_OFFSET

Frame_OFFSET

UL

UL

UL

UL

PROBLEM : Different SFH positions with different mixed ratios between 16e and 16m

Fixed Relative Timing

• Candidates for the Fixed Relative Timing– Should reduce the number of zone switching points between 16e and

16m sub-frames

• For example,

• Best Choice of the Fixed Relative Timing– The start of the 16m super-frame should be DL sub-frame before the

start of UL transmission.

TDD DL Frame

DL DLDL DL16e : 16m = 4 : 1

TDD UL Frame

16e : 16m = 3 : 2

Frame_OFFSET

DL

DL DLDL DLDL

Frame_OFFSET

UL

UL

PROBLEM : Multiple zone switching points between 16e and 16m sub-frames

Proposed Fixed Relative Timing

DL UL

Legacy TDD Frame : 5 ms

DL UL

Legacy TDD Frame : 5 ms

802.16m TDD Frame : 5 ms

DL DL DL

DL UL UL UL

DL DL

DL UL UL UL

DL

16e : 16m = 4 : 1

16e : 16m = 3 : 2

16e : 16m = 2 : 3

16e : 16m = 1 : 4

DL DL

DL

DL UL UL UL

DL DL DL

DL UL UL UL

DL DL DL DL

• Fixed Position of SFH– Aligned position between cells

– Remove the ambiguity problem

• The Last DL Sub-Frame– Remove the multiple zone switching problem

– Only one zone switching point in DL region

Proposed Text on C802.16m/118r1

11.4.2 Frame Structure Supporting Legacy Frames (proposal-1)The relative timing between the legacy and IEEE 802.16m radio frames shall be fixed. The relative start point of IEEE 802.16m TDD frame shall be the DL sub-frame before the start of UL transmission as shown in Figure 11.4-3.

DL UL

Legacy TDD Frame : 5 ms

DL UL

Legacy TDD Frame : 5 ms

802.16m TDD Frame : 5 ms

DL DL DL DLDL UL UL UL DL DL DL DLDL UL UL UL

802.16m TDD Frame : 5 ms

Control Information of 802.16m, e.g., Super-

Frame Header

Start of 802.16m TDD Frame :Fixed as The DL Sub-Frame

Before the Start of UL Transmission

Figure 11.4-3: Relative timing of the new and legacy radio frames (example TDD duplex scheme) proposal-1