Frame Structures for Legacy-Support and Legacy-Support Disabled Modes IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE S802.16m-08/243

Frame Structures for Legacy-Support and Legacy-Support Disabled Modes

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

IEEE S802.16m-08/243Date Submitted:

2008-03-17Source:

Sungho Moon and Jin Sam Kwak Voice: +82-31-450-1852LG Electronics E-mail: [email protected], [email protected],

[email protected], [email protected]; [email protected] Chongli Liu, Mingyang Sun, Xin Chang, Sean McBeath Huawei Technologies CO., LTD .*<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-08/243

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

Notice:This document does not represent the agreed views of the IEEE 802.16 Working Group or any of its subgroups. It represents only the views of the participants listed in the “Source(s)” field above. It is offered as a basis for discussion. It is not binding on the contributor(s), who reserve(s) the right to add, amend or withdraw material contained herein.

Release:The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that

this contribution may be made public by IEEE 802.16.

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<http://standards.ieee.org/guides/bylaws/sect6-7.html#6> and <http://standards.ieee.org/guides/opman/sect6.html#6.3>.Further information is located at <http://standards.ieee.org/board/pat/pat-material.html> and <http://standards.ieee.org/board/pat >.

http://grouper.ieee.org/groups/802/docs/99/802_16_template.doc



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Basic OFDM Parameters

• Considerations– Without physical layer impacts on the legacy system

– The same parameters : Sampling frequency, FFT sizes, and sub-carrier spacing

– Different parameter : CP length

Transmission Bandwidth (MHz) 5 10 20

Sampling Frequency (MHz) 5.6 11.2 22.4

FFT Size 512 1024 2048

Sub-Carrier Spacing (kHz) 10.94 10.94 10.94

Tu (us) 91.4 91.4 91.4

Usage Cyclic Prefix (CP) Ts (us)OFDM Symbols

per FrameIdle Time (us)

Legacy Support Mode / 16m MBS

Tg=1/8 Tu 91.4 + 11.42=102.82 48 64.64

Legacy Support-Disabled 16m Mode

Tg=1/16 Tu 91.4 + 5.71=97.11 51 47.39

Motivations of 1/16 Tu CP

• Wireless Channel Models

• CP Lengths of Other Systems– LTE : 4.69 us and 5.21 us in a sub-frame (7 % overhead)

– UMB : 6.51 us as a default CP length (6 % overhead)

– Reference system : 11.42 us (=1/8 Tu) (12.5 % overhead)

Channel Model Mean Delay Spread (ns) RMS Delay Spread (ns) Max. Delay Spread (us)

Pedestrian A 14.4 45 0.41

Pedestrian B 409.1 750 3.7

Vehicular A 254.4 370.4 2.51

TU 6-ray Model 705 1070 5

Normal CP Lengths

• Normal CP Length For Legacy-Support Mode– The same as that of the reference system, i.e., 11.42 us which is 1/8 of an

OFDM symbol (Tu)

• Normal CP length For Legacy-Support Disabled Mode– A CP length of 1/16 Tu – Proper size to support ordinary channel conditions without loss in

spectral efficiency

• Advantages of the CP Length of 1/16 Tu (= 5.71 us)– Less than 10% CP overhead loss– 51 OFDM symbols per frame = Better spectral efficiency ( ~6%)– Additional gain from appropriate usages of the 3 OFDM symbols, e.g., preamble,

midamble, control, sounding, and etc.

• Other Short or Long CP Lengths– Can be considered for extraordinary cases

Basic Frame Structure

SU0

F0

Super-Frame Based Control Signaling

SU1 SU2 SU4

Super-Frame : 20 ms

F1 F2 F4

...

Frame : 5 ms

SF0 SF1 SF2 SF3 SF4 SF5 SF6 SF7

S0

S1

S2

S3

S4

S5

Sub-frame

OFDM Symbol

S0

S1

S2

S3

S4

S5

S6

S0

S1

S2

S3

S4

1) Type-1 Sub-Frame :6 Symbols

2) Type-2 Sub-Frame : 5 Symbols


One-Symbol Punctured in Type-1

One-Symbol Added in Type-1

Frame Structure for Legacy-Support Mode

802.16m TDD Frame : 5 ms

DLSF0 (6)

DLSF1 (6)

DLSF2 (6)

DLSF3 (6)

DLSF4(5)

ULSF5 (6)

ULSF6 (6)

ULSF7 (6)

DL

Legacy TDD Frame : 5 ms

UL

RTG TTG

S0

S1

S2

S3

S4

S5

Type-1 Sub-frame

S0

S1

S2

S3

S4

Type-2 Sub-frame

102.82 us

6 OFDM Symbols = 0.617 ms 5 OFDM Symbols = 0.514 ms

802.16m FDD Frame : 5 ms

DL/ULSF0 (6)

DL/ULSF1 (6)

DL/ULSF2 (6)

DL/ULSF3 (6)

DL/ULSF4 (6)

DL/ULSF5 (6)

DL/ULSF6 (6)

DL/ULSF7 (6)

Idle

102.82 us

29 OFDM Symbols 18 OFDM Symbols

For TTG/RTG

Frame Structure for Legacy-Support Disabled Mode


DLSF0 (7)

DLSF1 (6)

DLSF2 (6)

DLSF3 (6)

DLSF4 (6)

ULSF5 (6)

ULSF6 (6)

ULSF7 (7)

DL UL

RTGTTG

S0

S1

S2

S3

S4

S5

Type-1 Sub-frame

S0

S1

S2

S3

S4

Type-3 Sub-frame

97.11 us



S5

DL/ULSF0 (7)

DL/ULSF1 (6)

DL/ULSF2 (6)

DL/ULSF3 (6)

DL/ULSF4 (7)

DL/ULSF5 (6)

DL/ULSF6 (6)

DL/ULSF7 (7)

Idle

97.11 us

TTG



S6

Coexistence Btw. Legacy-Support and Legacy-Support Disabled Modes

(7:1)TTG:107.46

802.16m in Legacy-Support Mode (Tg = 1/8 Tu)

3010.41

DL(7)

3094.91

DL DL DL DL

TTG:84.5

3593.07

DLDL(7)

DL DL DL DL

3677.57

TTG:84.5

4175.73

DL DL

RTG : 60.0

DL(7)

DL DL DL DL

4260.23

UL(7)

TTG:84.5

DL(7)

2427.8

DL: UL = 4:4 DL DL DL

2511.6

TTG:84.5

DL: UL = 5:3

DL: UL = 6:2

DL: UL = 7:1

(6:2)TTG:107.46(5:3)

TTG:107.46

(4:4) TTG:107.46

UL ULUL(7)

UL(7)

UL

UL(7)

UL

UL

UL

RTG : 60.0

RTG : 60.0

RTG : 60.0

RTG : 60.0

5000 (us)

Proposed Structure for Legacy-Support Disabled Mode

Sub-Frame Type Type-1 Type-2 Type-3

CP Length DL:UL Sub-Frame Index

1/8 Tu

(4:4) 0, 1, 2, 4, 5, 6, and 7 3 N/A

(5:3) 0, 1, 2, 3, 5, 6, and 7 4 N/A

(6:2) 0, 1, 2, 3, 4, 6, and 7 5 N/A

(7:1) 0, 1, 2, 3, 4, 5, and 7 6 N/A

1/16 Tu

(4:4) 1, 2, 3, 4, 5, and 6 N/A 0 and 7

(5:3) 1, 2, 3, 4, 5, and 6 N/A 0 and 7

(6:2) 1, 2, 3, 4, 5, and 6 N/A 0 and 7

(7:1) 1, 2, 3, 4, 5, and 6 N/A 0 and 7

• Advantages– Increased spectral efficiency (6%)

– No problem to coexist with 16m systems operating with a 1/8 CP length– Commonality with structures of a CP length of 1/8 Tu,

• Number of sub-frames per frame, i.e., 8 sub-frame per frame

• Number of OFDM symbols per sub-frame, e.g., 5, 6, and 7 OFDM symbols per sub-frame

• Unified TDD Configuration for Both CP Cases

Proposed Text on C802.16m/118r1

11.3 OFDM Parameters[Add a CP length option into Table 11.3-1 (proposal-1) in C802.16m-08/118r1 as follows:]

Nominal Channel Bandwidth (MHz) 5 7 8.75 10 20

Over-sampling Factor 28/25 8/7 8/7 28/25 28/25

Sampling Frequency (MHz) 5.6 8 10 11.2 22.4

FFT Size 512 1024 1024 1024 2048

Sub-Carrier Spacing (kHz) 10.94 7.81 9.77 10.94 10.94

Tu (us) 91.4 128 102.4 91.4 91.4

Cyclic Prefix (CP) Ts (us) Number of OFDM Symbols per Frame Idle Time (us)

Tg=1/8 Tu

91.4 + 11.42=102.82 (for

5, 10, 20 MHz)48 (for 5, 10, 20 MHz) 64.64

128+16=144 (for 7 MHz)

34 (for 7 MHz) 104

102.4+12.8=115.2 (for 8.75 MHz)

43 (for 8.75 MHz) 46.40

Tg = 1/16 Tu 91.4 + 5.71 = 97.11 (for 5, 10, 20 MHz)

51 (for 5, 10, 20 MHz) 47.39

[Table 11.3-1: OFDM parameters for IEEE 802.16m] proposal-1

* Other CP, e.g., 1/32 Tu or 1/4 Tu, can be considered in the 16m numerology.

Proposed Text on C802.16m/118r1 (cont’d)11.4.1 Basic Frame Structure (proposal-1)[Replace Figure 11.4-1 (proposal-1) in C802.16m-08/118r1 with the following figure]

SU0

F0

Super-Frame Based Control Signaling

SU1 SU2 SU4

Super-Frame : 20 ms

F1 F2 F4

...

Frame : 5 ms

SF0 SF1 SF2 SF3 SF4 SF5 SF6 SF7

S0

S1

S2

S3

S4

S5

Sub-frame

OFDM Symbol

S0

S1

S2

S3

S4

S5

S6

S0

S1

S2

S3

S4

1) Type-1 Sub-Frame :6 Symbols



One-Symbol Punctured in Type-1

One-Symbol Added in Type-1

Figure 11.4-1: Basic frame structure

Proposed Text on C802.16m/118r1 (cont’d)

[Replace Figure 11.4-2 (option1) in C802.16m-08/118r1 with the following figure]


DLSF0 (6)

DLSF1 (6)

DLSF2 (6)

DLSF3 (6)

DLSF4(5)

ULSF5 (6)

ULSF6 (6)

ULSF7 (6)

DL


UL

RTG TTG

S0

S1

S2

S3

S4

S5

Type-1 Sub-frame

S0

S1

S2

S3

S4

Type-2 Sub-frame

102.82 us



DL/ULSF0 (6)

DL/ULSF1 (6)

DL/ULSF2 (6)

DL/ULSF3 (6)

DL/ULSF4 (6)

DL/ULSF5 (6)

DL/ULSF6 (6)

DL/ULSF7 (6)

Idle

102.82 us


For TTG/RTG

Figure 11.4-2 : TDD and FDD Frame Structures with a CP of 1/8 Tu (DL to UL ratio of 5:3)

Proposed Text on C802.16m/118r1 (cont’d)

[Replace Figure 11.4-3 (option1) in C802.16m-08/118r1 with the following figure]

Figure 11.4-3: TDD and FDD Frame Structure with a CP of 1/16 Tu (DL to UL ratio of 5:3)


DLSF0 (7)

DLSF1 (6)

DLSF2 (6)

DLSF3 (6)

DLSF4 (6)

ULSF5 (6)

ULSF6 (6)

ULSF7 (7)

DL UL

RTGTTG

S0

S1

S2

S3

S4

S5

Type-1 Sub-frame

S0

S1

S2

S3

S4

Type-3 Sub-frame

97.11 us



S5

DL/ULSF0 (7)

DL/ULSF1 (6)

DL/ULSF2 (6)

DL/ULSF3 (6)

DL/ULSF4 (7)

DL/ULSF5 (6)

DL/ULSF6 (6)

DL/ULSF7 (7)

Idle

97.11 us

TTG



S6

Documents

Frame Structures for Legacy-Support and Legacy-Support Disabled Modes IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE S802.16m-08/243