1. Coexistence Supports with Other TDD Systems in Frame Structure IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: S802.16m-08/476 Date Submitted: 2008-05-14 Source: DongCheol Kim, Jin Sam Kawk, Sungho Moon Voice:+82-31-450-1916 LG Electronics E-mail: {dongcheol.kim; samji; msungho}@lge.comdongcheol.kim; samji; msungho}@lge.com Xufeng Zheng, Zongchuang Liang Voice: +86-10-5925 3333 Samsung China Telecom R&D Center E-mail: xufeng.zheng@samsung.comxufeng.zheng@samsung.com Jaeweon Cho, Hokyu Choi Samsung Electronics Co., Ltd. Sassan Ahmadi E-mail: sassan.ahmadi@intel.comsassan.ahmadi@intel.com Intel Corporation Venue: Re: IEEE 802.16m-08/016r1 “Call for Contributions on P802.16m SDD” - IEEE 802.16m-08/003r1 Base Contribution: C802.16m-08/476r1 Purpose: To be discussed and adopted by TGm for use in the IEEE 802.16m SDD 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: and.http://standards.ieee.org/guides/bylaws/sect6-7.html#6http://standards.ieee.org/guides/opman/sect6.html#6.3 Further information is located at and.http://standards.ieee.org/board/pat/pat-material.htmlhttp://standards.ieee.org/board/pat

2. Introduction The 16m shall support co-deployment scenarios with other TDD systemsThe 16m shall support co-deployment scenarios with other TDD systems –E-UTRA TDD –UTRA LCR-TDD The inter DL-UL interference can be defined as a interference caused by mis-alignment of DL and UL regions between TDD systemsThe inter DL-UL interference can be defined as a interference caused by mis-alignment of DL and UL regions between TDD systems The DL/UL regions of the 16m should be aligned with existing TDD systemsThe DL/UL regions of the 16m should be aligned with existing TDD systems To coexist with a target TDD system, the 16m frame should be delayed or offsetTo coexist with a target TDD system, the 16m frame should be delayed or offset

3. Alignment methods for coexistence Categorized by aligned point between TDD systemsCategorized by aligned point between TDD systems –DL-aligned and UL-aligned schemes Fig. 1 Alignment examples of IEEE 802.16m and LTE TDD frames

4. Frame Alignment with LTE TDD The UL/DL configuration of LTE TDD can be categorized into two cases by switch-point periodicityThe UL/DL configuration of LTE TDD can be categorized into two cases by switch-point periodicity Table 1. Downlink-Uplink Allocations in LTE TDD Configuration Switch-point periodicity Sub-frame number 1 st half-frame 2 nd half-frame 0123456789 0 5 ms DSUUUDSUUU 1 DSUUDDSUUD 2 DSUDDDSUDD 3 10 ms DSUUUDDDDD 4 DSUUDDDDDD 5 DSUDDDDDDD 6 DSUUUDSUUD

5. Frame Alignment with LTE TDD (cnt’d) Coexistence with 5ms periodicity frame configurationsCoexistence with 5ms periodicity frame configurations –Configuration 0,1, and 2 in Table 1 –The number of punctured symbols Min. Two symbols : from the best choice between DL-aligned and UL-aligned schemes Max. Four symbols : Either DL-aligned or UL-aligned schemes

6. Frame Alignment with LTE TDD (cnt’d) Coexistence with 10 ms Periodicity Frame ConfigurationsCoexistence with 10 ms Periodicity Frame Configurations –The Configurations 3, 4, 5, and 6 have two different 5ms frames within a 10 ms LTE TDD frame –Thus, there will be a large number of punctured symbols –In those cases, asymmetric frame configuration should be considered in 16m TDD. Fig. 2 Asymmetric frame configuration for 10 ms switch-point periodicity in LTE

7. Frame Alignment with LTE TDD (cnt’d) Fig. 3. Asymmetric frame configuration for LTE configuration 6 (the 8th case of normal CP) In the configuration 6, the DL-aligned asymmetric configuration must yield more than 8 punctured symbols every 10 ms. We can find an available UL-aligned asymmetric configuration in which the number of punctured symbols is smaller than 8. The UL-alignment is necessary to minimize punctured symbols in case of configuration 6 in LTE.

8. Frame Alignment with UTRA LCR-TDD (TD-SCDMA) The LCR-TDD frame has two identical 5ms half-frames within a 10ms frame like the configuration 0, 1, and 2 in LTEThe LCR-TDD frame has two identical 5ms half-frames within a 10ms frame like the configuration 0, 1, and 2 in LTE The optimal offset values to minimize punctured symbols can be derived from one of the previously described DL- or UL-alignment schemes for 5ms periodicity frames.The optimal offset values to minimize punctured symbols can be derived from one of the previously described DL- or UL-alignment schemes for 5ms periodicity frames. DwPTS = 75 us, GP = 75 us, and UpPTS = 125 us LCR-TDD DL/UL Ratio 4:35:26:1 Comparison btw. DL- and UL-Aligned Schemes DL- Aligned UL- Aligned DL- Aligned UL- Aligned DL- Aligned UL- Aligned DL/UL ratio for 802.16m TDD in 5ms frame, Punctured symbols in 5ms frame 5:3, two 4:4, three 6:2, two 5:3, three 7:1, one 6:2, four Offset29753279.4323002662.5116252045.59 Table 3. IEEE 802.16m DL/UL ratios and punctured symbols to coexist with LCR-TDD

9. Proposed Text for SDD 11.4.6 Coexistence Supports in Frame Structure 11.4.6.1 Coexistence with E-UTRA (LTE-TDD) Figure 11.4-X demonstrates how coexistence between IEEE 802.16m and E- UTRA can be achieved in FDD mode to minimize the inter-system interferen ce. Coexistence between IEEE 802.16m and E-UTRA in TDD mode may be facilitated by inserting either idle symbols within the IEEE 802.16m frame or idle sub-frames. Applying a delay or frame offset between the beginnings of t he IEEE 802.16m frame and the E-UTRA TDD frame may allow the time all ocated to idle symbols or idle sub-frames to be minimized. Figure 11.4-Y shows two examples using frame offset to support coexistence with E-UTRA TDD in order to support minimization of the number of punctured symbols within the IEEE 802.16m frame. Figure 11.4-X demonstrates how coexistence between IEEE 802.16m and E- UTRA can be achieved in FDD mode to minimize the inter-system interferen ce. Coexistence between IEEE 802.16m and E-UTRA in TDD mode may be facilitated by inserting either idle symbols within the IEEE 802.16m frame or idle sub-frames. Applying a delay or frame offset between the beginnings of t he IEEE 802.16m frame and the E-UTRA TDD frame may allow the time all ocated to idle symbols or idle sub-frames to be minimized. Figure 11.4-Y shows two examples using frame offset to support coexistence with E-UTRA TDD in order to support minimization of the number of punctured symbols within the IEEE 802.16m frame. ------------------------------------------- Start of the Text ------------------------------------------------

10. Figure 11.4-X Alignment of IEEE 802.16m frame with E-UTRA frame in FDD mode Figure 11.4-Y Alignment of IEEE 802.16m frame and E-UTRA frame in TDD mode

11. -------------------------------------------- End of the Text ---------------------------------------------------- 11.4.6.2 Coexistence with UTRA LCR-TDD (TD-SCDMA) Coexistence between IEEE 802.16m and UTRA LCR-TDD may be facilitated by inserting either idle symbols within the IEEE 802.16m frame or idle sub-frames. Applying a delay or frame offset between the beginnings of the IEEE802.16m frame and the UTRA LCR-TDD frame may allow the time allocated to idle symbols or idle sub-frames to be minimized. Figures 11.4-Z demonstrates how coexistence between IEEE802.16m and UTRA LCR-TDD can be achieved to minimize the inter-system interference. Proposed Text for SDD Figure 11.4-Z: Alignment of IEEE 802.16m frame with UTRA LCR-TDD frame in TDD mode