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1 Multi-RAT Coexistence Analysis and Frame Configuration (15.3.3) Document Number: IEEE C802.16m-09/2124 Date Submitted: 2009-08-31 Source: Yujian Zhang [email protected] Hujun Yin [email protected] Xinrong Wang [email protected] Yuan Zhu [email protected] Intel Corporation Re: IEEE 802.16m-09/0037, “Call for Contributions on Project 802.16m Amendment Content” Venue: IEEE Session#63, Jeju Base Contribution: None Purpose: Discussion and Adoption by TGm 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. Patent Policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: <http://standards.ieee.org/guides/bylaws/sect6-7 . html#6> and

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Page 1: 1 Multi-RAT Coexistence Analysis and Frame Configuration (15.3.3) Document Number: IEEE C802.16m-09/2124 Date Submitted: 2009-08-31 Source: Yujian Zhangyujian.zhang@intel.comyujian.zhang@intel.com

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Multi-RAT Coexistence Analysis and Frame Configuration (15.3.3)

Document Number: IEEE C802.16m-09/2124Date Submitted: 2009-08-31

Source: Yujian Zhang [email protected] Hujun Yin [email protected] Xinrong Wang [email protected] Zhu [email protected]

Intel Corporation

Re: IEEE 802.16m-09/0037, “Call for Contributions on Project 802.16m Amendment Content” Venue: IEEE Session#63, Jeju

Base Contribution: NonePurpose: Discussion and Adoption by TGmNotice:

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.

Patent Policy:The contributor is familiar with the IEEE-SA Patent Policy and Procedures:

<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 >.

Page 2: 1 Multi-RAT Coexistence Analysis and Frame Configuration (15.3.3) Document Number: IEEE C802.16m-09/2124 Date Submitted: 2009-08-31 Source: Yujian Zhangyujian.zhang@intel.comyujian.zhang@intel.com

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Executive Summary (1)

• For 16m CP ratio 1/8, BW 5/10/20 MHz.• Legends:

– For TD-SCDMA: Yes/No: whether coexistence is possible or not.– For LTE TDD

• All: all cases in LTE-TDD can coexist with 16m scenario.• Most: two DwPTS categories of LTE-TDD can coexist with 16m.• Few: only 3 OFDM symbol DwPTS category of LTE-TDD can coexist with 16m.• N/A: the case violates the constraint that there should be at least 2 type-1 subframes / frame.

• Notes– D:U ratio in bracket is 16m D:U ratio which can coexist with TD-SCDMA/LTE TDD.– UL-DL Configuration 1 is the most important LTE-TDD case to consider.

# of type-3 subframes / frame

TD-SCDMA LTE TDD

4:3 5:2 UL-DL Cfg. 0 UL-DL Cfg. 1 UL-DL Cfg. 2

1 No No All (3:5) Few (4:4) Most (6:2)

2 No Yes (6:2) N/A (3:5) Most (5:3 & 4:4) Most (6:2)

3 Yes (5:3) Yes (6:2) N/A (3:5) All (5:3) Most (6:2)

Page 3: 1 Multi-RAT Coexistence Analysis and Frame Configuration (15.3.3) Document Number: IEEE C802.16m-09/2124 Date Submitted: 2009-08-31 Source: Yujian Zhangyujian.zhang@intel.comyujian.zhang@intel.com

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Executive Summary (2)

• Changes to Frame Structure– For 16m 1/8 CP ratio, BW 5/10/20 MHz, allow 2 and 3 DL type-3 subframes.– This effectively increases TTG, which is friendly for cell coverage.

• Configurations to add: (please refer to contribution C80216m-09/1971).• 2 type-3 subframes, 6:2• 3 type-3 subframes, 5:3• 2 type-3 subframes: 5:3

Page 4: 1 Multi-RAT Coexistence Analysis and Frame Configuration (15.3.3) Document Number: IEEE C802.16m-09/2124 Date Submitted: 2009-08-31 Source: Yujian Zhangyujian.zhang@intel.comyujian.zhang@intel.com

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Current Status in 802.16m

• Examples are given in section 11.4.4.1 of SDD.

Page 5: 1 Multi-RAT Coexistence Analysis and Frame Configuration (15.3.3) Document Number: IEEE C802.16m-09/2124 Date Submitted: 2009-08-31 Source: Yujian Zhangyujian.zhang@intel.comyujian.zhang@intel.com

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Criterion of Coexistence (1)• Principle: avoid simultaneous transmission of DL from one RAT and UL from another RAT, i.e.

align switching points of two RATs. • Assumption: base stations of two RATs are co-site.• Notations:

– D1, T1, U1, R1 and D2, T2, U2, R2 denote the length of DL, TTG, UL, and RTG for RAT1 and RAT2 respectively, with the constraint D1+T1+U1+R1 = D2+T2+U2+R2 = F = 5 ms

– Assume the UL end of RAT1 can be left shifted x relative to the UL end of RAT2.– 60μs RTG assumed for LTE-TDD, although not officially specified.

• When considering BS-to-BS interference only– At UL->DL switching point, to avoid interference: -R2 ≤x≤R1.– At DL->UL switching point, to avoid interference between RAT1 DL to RAT2 UL: U2 ≤T1+U1+x; to avoid

interference between RAT1 UL to RAT2 DL: U1+x ≤T2+U2

– So if there is any x satisfying both -R2 ≤x≤R1 and U2-U1-T1 ≤ x≤ U2-U1+T2, then coexistence is possible. It is equivalent to max(-R2 , U2-U1-T1) ≤ x ≤ min(R1, U2-U1+T2).

– The simplified criterion is D1+U2 ≤F, and D2+U1 ≤F. Distributions of TTG and RTG within each RAT does NOT impact coexistence.

Page 6: 1 Multi-RAT Coexistence Analysis and Frame Configuration (15.3.3) Document Number: IEEE C802.16m-09/2124 Date Submitted: 2009-08-31 Source: Yujian Zhangyujian.zhang@intel.comyujian.zhang@intel.com

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Criterion of Coexistence (2)• When considering MS-to-MS interference in addition to BS-to-BS

interference– Requirements for BS-to-BS interference should be satisfied.

– For every RAT, at MS side, TTG is reduced by RTD while RTG is increased by RTD, with RTD = 2r/c, where r is cell radius and c is the speed of light. RTD is 0. 667 ms for 100 km cell radius.

– Additional inequalities to satisfy: max(-(R2+RTD) , U2-(T1-RTD)-U1) ≤ x ≤ min(R1+RTD, T2-RTD+U2-U1).

– It is equivalent to D1+U2 ≤F-RTD, D2+U1 ≤F-RTD, and T1+T2≥2RTD.

– There is NO need to support quite large cell radius, since in that case, even the same RAT will have MS-to-MS interference. • In the analysis, we assume the maximum cell radius is 5 km, which corresponds to 33.3

μs.

• In addition, RTD should be selected so that there is no self-interference for each RAT, i.e. RTD = min(33.3 μs, F-D1-U1, F-D2-U2, T1, T2).

Page 7: 1 Multi-RAT Coexistence Analysis and Frame Configuration (15.3.3) Document Number: IEEE C802.16m-09/2124 Date Submitted: 2009-08-31 Source: Yujian Zhangyujian.zhang@intel.comyujian.zhang@intel.com

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16m CP ratio 1/8 – 1 type-3 subframeLTE UL-DL Configuration 1 (16m D:U=4:4)

LTE UL-DL Configuration 2 (16m D:U=6:2)

LTE UL-DL Configuration 0 (16m D:U=3:5)

Background color• Green: coexistence possible• Yellow: coexistence impossible• Cyan: coexistence is possible when MS-to-MS interference is not considered; impossible when such interference is considered.

Page 8: 1 Multi-RAT Coexistence Analysis and Frame Configuration (15.3.3) Document Number: IEEE C802.16m-09/2124 Date Submitted: 2009-08-31 Source: Yujian Zhangyujian.zhang@intel.comyujian.zhang@intel.com

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16m CP ratio 1/8 – 2 type-3 Subframes

LTE UL-DL Configuration 1 (16m D:U=5:3, 4:4 for 4 cases)

LTE UL-DL Configuration 2 (16m D:U=6:2)

LTE UL-DL Configuration 0 (16m D:U=3:5)

Page 9: 1 Multi-RAT Coexistence Analysis and Frame Configuration (15.3.3) Document Number: IEEE C802.16m-09/2124 Date Submitted: 2009-08-31 Source: Yujian Zhangyujian.zhang@intel.comyujian.zhang@intel.com

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16m CP ratio 1/8 – 3 type-3 Subframes

LTE UL-DL Configuration 1 (16m D:U=5:3)

LTE UL-DL Configuration 2 (16m D:U=6:2)

LTE UL-DL Configuration 0 (16m D:U=3:5)

Page 10: 1 Multi-RAT Coexistence Analysis and Frame Configuration (15.3.3) Document Number: IEEE C802.16m-09/2124 Date Submitted: 2009-08-31 Source: Yujian Zhangyujian.zhang@intel.comyujian.zhang@intel.com

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Backup

Page 11: 1 Multi-RAT Coexistence Analysis and Frame Configuration (15.3.3) Document Number: IEEE C802.16m-09/2124 Date Submitted: 2009-08-31 Source: Yujian Zhangyujian.zhang@intel.comyujian.zhang@intel.com

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TD-SCDMA Frame Structure

UpPTS

(160chips)

Subframe 5ms (6400chip)

1.28Mcps

DwPTS

(96chips)GP (96chips)

Switching Point

Switching Point

• In current TD-SCDMA deployment, the common D:U ratios are 4:3 and 5:2.

Page 12: 1 Multi-RAT Coexistence Analysis and Frame Configuration (15.3.3) Document Number: IEEE C802.16m-09/2124 Date Submitted: 2009-08-31 Source: Yujian Zhangyujian.zhang@intel.comyujian.zhang@intel.com

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LTE TDD Frame Structure (1)

One slot, Tslot=15360Ts

GP UpPTSDwPTS

One radio frame, Tf = 307200Ts = 10 ms

One half-frame, 153600Ts = 5 ms

30720Ts

One subframe, 30720Ts

GP UpPTSDwPTS

Subframe #2 Subframe #3 Subframe #4Subframe #0 Subframe #5 Subframe #7 Subframe #8 Subframe #9

Page 13: 1 Multi-RAT Coexistence Analysis and Frame Configuration (15.3.3) Document Number: IEEE C802.16m-09/2124 Date Submitted: 2009-08-31 Source: Yujian Zhangyujian.zhang@intel.comyujian.zhang@intel.com

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LTE TDD Frame Structure (2)