FDD Frame Structure for Legacy Support (15.3.3.4.3)

IEEE 802.16 Presentation Submission Template (Rev. 9)

Document Number: IEEE C802.16m-09/2095

Date Submitted: 2009-08-30

Source:HanGyu Cho, Dongguk Lim, Sungho Moon, Jin Sam Kwak Email: {hgcho} @lge.com

LG Electronics

Re: IEEE 802.16m-09/0045, IEEE 802.16 Working Group Letter Ballot #30

Venue: IEEE Session #63

Base Contribution: IEEE C802.16m-09/2095Purpose:

To be discussed and adopted by TGm.Notice:

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Motivation In 16m, 16m FDD AMSs can coexist with legacy H-FDD MSs

In D1 document, there is only FDD frame structure for 16m only case. FDD frame structure for supporting legacy H-FDD MSs shall be proposed

Design Philosophy on FDD Frame Structure in legacy Support

Main focus on coexistence of 16m F-FDD and legacy H-FDD which is a promising scenario• But, 16m H-FDD can also co-exist

No impact on F-FDD operations when coexisting with legacy H-FDD MSs• 16m zone and legacy zone are TDM-multiplexed in the unit of subframes• Legacy zone is operated like the zone for H-FDD group 1

In DL, legacy zone is the first In UL, 16m zone is the first

Considering HARQ operation, • It is desirable to assign the same number of subframes for DL and UL in 16m

zone Considering legacy DL region and legacy UL region can not be overlapped, the ma

ximum size for legacy DL region and legacy UL region is• 2 subframes for 7 MHz (5 subframes)• 3 subframes for 8.75 MHz (7 subframes)• 4 subframes for 5, 10, 20 MHz (8 subframes)

FDD Frame Structure configurations in Legacy Support

Based on the previous slide, possible configurations can be summarized as follows:

BandwidthNo. of subframes in

a frameConfigurations(16m:Legacy)

5 MHz

8 subframes/frame (6,2), (5:3), (4:4)10 MHz

20 MHz

7 MHz 5 subframes/frame (3:2)

8.75 MHz 7 subframes/frame (5:2), (4:3)

FDD Frame Structure in Legacy Support 5, 10, 20 MHz case - (16m:legacy)=(5:3)

Advanced Air Interface DL ZoneWirelessMAN OFDMA DL Zone

OFDMA Frame duration(5ms)

DL Frame structure

Sub

chan

nel L

ogic

al N

umber

Idle time=62.857μsec

Preamble 1

FCH

DL-MAP 1

DL-burst #0

(carrying UL-MAP)

DL- burst #1

DL- burst #2

DL- burst #3

DL- burst #4

DL- burst #5

DLsubframe #1

DLsubframe #2

DLsubframe #3

DLSubframe #0

SFH

A-Preamble

UL burst #1

UL burst #2

UL burst #3

UL burst #4

UL burst #5

Ranging Channel, CQI channel, ACK

channel

ULsubframe #1

ULsubframe #2

(6) (6) (6) (6)(6) (6) (6)(6)

Advanced Air Interface UL ZoneWirelessMAN OFDMA UL Zone

UL Frame structure

ULsubframe #3

Preamble 1

FCH

DL-MAP 1

DL-burst #0

(carrying UL-MAP)

DL- burst #1

DL- burst #2

DL- burst #3

DL- burst #4

DL- burst #5

(6) (6) (6)(6)

DLSubframe #0

ULsubframe #1

ULsubframe #2

ULSubframe #0

ULsubframe #3

(6) (6) (6) (6)(6) (6) (6)(6)

DLsubframe #4

ULsubframe #4

ULsubframe #4

A-Preamble

Advanced Air Interface UL Zone

FDD Frame Structure in Legacy Support 16m F-FDD AMS operation

• Can use all the subframes in 16m zone Legacy H-FDD AMS operation

• For legacy H-FDD operations, there are two key parameters: No. of OFDMA symbols in DL-MAP1 and No. of OFDMA symbols in UL MAP1

• For legacy support, two parameters shall be well adjusted such that legacy UL region and 16m UL region shall not be overlapped. In the previous slide, for example, the following shall be satisfied (considering TTG1=154.22us)

No. of OFDMA symbols in DL-MAP1>=23 No. of OFDMA symbols in DL-MAP1+ No. of OFDMA symbols in UL-MAP1

<=40• But, DL scheduling for legacy H-FDD MSs should be restricted to legacy DL zo

ne 16m H-FDD AMS operation

• Considering decoding of SFH&preamble and transition gap, some of UL subframes and DL subframes shall be punctured

• In the previous slide, for example, UL o,1,2 subframes and the corresponding DL 0, 1, 2 subframes are used

Proposed Text on FDD Frame Structure in Legacy Support

[Insert the following text in Section 15.3.3.4.3 on page 244 in line 34 of P802.16m/D1]Figure xxx illustrates an example of frame configuration for supporting the WirelessMAN-OFDMA H-FDD MSs for 5, 10, and 20 MHz with a CP length of 1/8 Tb. The FDD frame structure is separated two regions in the DL and UL for supporting the coexistence of the WirelessMAN-OFDMA H-FDD MSs and AAIF FDD MSs in the same frame. An ABS shall be able to simultaneously support half duplex and full-duplex AMSs in AAIF DL/UL zone. The ABS also supports WirelessMAN-OFDMA H-FDD MSs in WirelessMAN-OFDMA DL/UL zone. For WirelessMAN-OFDMA H-FDD MSs, by using the “No. of OFDMA Symbols” field in DL-MAP1 and UL-MAP1 of the WirelessMAN-OFDMA frame, the ABS shall indicate the number of symbols in DL and UL of the WirelessMAN-OFDMA frame for non-overlapped allocation between WirelessMAN-OFDMA UL zone and AAIF UL zone. In addition, the data bursts for the WirelessMAN-OFDMA H-FDD MSs shall not be transmitted in the AAIF DL zone.

[Figure in Page 5]

Figure xxx FDD frame configuration for supporting the WirelessMAN-OFDMA H-FDD operation