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IEEE 802 Air-Interface Support for Co-Located Coexistence

IEEE 802 Air-Interface Support for Co-Located Coexistence. Date: 2008-07-07. Authors:.

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IEEE 802 Air-Interface Support for Co-Located Coexistence

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  1. IEEE 802 Air-Interface Support for Co-Located Coexistence Date: 2008-07-07 Authors: Notice:This document has been prepared to assist IEEE 802.19. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Jing Zhu, Intel Corporation

  2. Abstract This presentation reviews the existing mechanisms in the latest IEEE 802.16 / 802.11 standard drafts, particularly “PSC-based co-located coexistence enhancement” in IEEE 802.16 Rev2 and “Co-located Interference Reporting” in IEEE 802.11v, and includes material that have been previously submitted. Jing Zhu, Intel Corporation

  3. Outline • Motivation • 802.16 Rev2: PSC-based Co-located Coexistence • 802.11v: co-located interference reporting • Comparison Jing Zhu, Intel Corporation

  4. Motivation: Multi-Radio User Terminal • Problem: Interference between co-located radios • small separation, e.g. <20MHz between WiFi/BT and WiMAX • Bluetooth, Wi-Fi: 2.4Ghz • WiMAX: 2.3-2.4Ghz, 2.5-2.7Ghz • wideband interference, e.g. receiver blocking and OOB emission • little isolation, e.g. 10~30dB isolation on a small form-factor device • with no solution, co-located Tx or Rx of different technos is generally ok (as long as difference between Tx or Rx signals does not exceed 20dB), but co-located Tx of one techno prevents Rx of other technos • Solution 1: RF domain (filtering, isolation, etc.) • costly, large in size, highly platform dependent • not effective to wideband interference with small separation • Solution 2: Time domain (TDM / MAC coordination) • universal, effective, and media independent • enabled by packet switching and spectrum efficient PHY (MIMO-OFDM) • but need air-interface support • Air-Interface Design Considerations: • Data Rate • Coverage • QoS • Security • Power • Mobility • Multi-Radio Coexistence • … Jing Zhu, Intel Corporation

  5. Typical Co-Located Coexistence (CLC) Activities 625us Bluetooth SCO/eSCO Tx Rx 1 2 3 4 5 6 3.75ms 15ms (3 frames) varied Wi-Fi Beacon Rx Rx Rx Rx 102.4ms 102.4ms Wi-Fi Data Tx Data ACK Data ACK varied varied Problem Description: Co-located Coexistence (CLC) Activities are the Tx or/and Rx activities of one or multiple co-located radios that are not detectable over the air, but will impact the communications to / from another co-located radio. Jing Zhu, Intel Corporation

  6. 802.16 Rev2: PSC-based Co-Located Coexistence (CLC) • High level principles • Extends usage of power save class (PSC) to manage TDM between WiMAX and other technologies [PSC-based Mode 1, 2 + MAP Relevance] • Makes use of AMC permutation to increase spectrum separation • PSC-based Mode 1  TDM-based CLC with Wi-Fi • BS shall honor the configurations for the PSC in the MS MOB_SLP-REQ message, and does not gratuitously reject or modify the configuration. • MAP Relevance: defines that the listen and sleep interval follow the MAP relevance. For example, the UL subframe of each listening and sleep interval is shifted to the next frame compared to the DL subframe of that interval according to the MAP relevance. • PSC-based Mode 2  TDM-base CLC with Bluetooth eSCO • BS shall not provide any MS UL allocation in the first frame of the listening interval • BS should provide any DL allocation as much as possible in the first frame of listening interval • BS shall, to all extent possible, populate the DL subframe such that DL allocations for all MS with Co-located-Coexistence-Enabled active PSC and with allocations in the current DL subframe, precede in time the allocations for other MS that do not need co-located coexistence support and are allocated in the same DL subframe. • UL Band AMC  Reduce Interferences to Other Radios • either lowermost or uppermost frequencies will be used for UL band AMC subchannel allocations to achieve the maximum spectrum separation between 802.16 radio and the co-located radio in the adjacent bands. Jing Zhu, Intel Corporation

  7. PSC-based Mode 1 (w/ MAP Relevance) UL MAP Relevance “MAP Relevance” provides balanced DL/UL throughput with shorter duty cycle, which benefits the QOS. Jing Zhu, Intel Corporation

  8. PSC-based Mode 2 Jing Zhu, Intel Corporation

  9. Co-Located-Coexistence-Enabled TLV • Bit #2 can set to 1 only if bit #0 is set to 1 and bit #1 is set to 0 • Bit #4 shall be interpreted by the BS only if bit #3 is set to 1 • Only one instance of this Co-located Coexistence-Enabled TLV should be added to MOB_SLP-REQ and MOB_SLP-RSP messages Jing Zhu, Intel Corporation

  10. PSC Parameters and Sleeping / Absence Pattern Maximum Initial Listening Window = Maximum Initial Sleep Window = 255 frames (1.275 second) Jing Zhu, Intel Corporation

  11. IEEE 802.16 Other Relevant Activities • IEEE 802.16m • Multi-Radio Coexistence block performs functions to support concurrent operations of IEEE 802.16m and non-IEEE 802.16m radios collocated on the same mobile station.  Call for contributions for system description document in September ‘08 Jing Zhu, Intel Corporation

  12. 802.11v – Co-located Interference Reporting STA AP Co-located Interference Request • Simple protocol enables terminal to indicate it is using several radios simultaneously and performance of WLAN RX is degraded • Report allows terminal to indicate interference time characteristics, level, and other information • Automatic reporting is supported, i.e., whenever STA realize co-located interference is changed it can send Report to AP • AP can use reported information several ways, 1) it can schedule DL transmissions not to collide with interference slots and 2) it can use information to adjust e.g., rate adaptation and retransmission logics Other radio operation is started causing performance degradation Co-located Interference Report Other radio operation is stopped Co-located Interference Report Jing Zhu, Intel Corporation

  13. 802.11v: Co-located Interference Report Information Element Jing Zhu, Intel Corporation

  14. Comparison Jing Zhu, Intel Corporation

  15. Further steps • Complementarities of proposed options: typical behavior/setting of device integrating 802.11v+802.16-Rev2 add-ons for CLC  Discussions • Interaction with other functionalities: • 802.11 power save modes (U/S-APSD in 802.11e + U/S-PSMP in 802.11n) • …?  Design use cases and scenarios • Synchronize timetables for availabilities of different standards and related certification / IOT in forums (WMF, BT SIG, WFA) • Other open issues Jing Zhu, Intel Corporation

  16. References • IEEE P802.16Rev2 D5.0 • IEEE P802.11v-D2.01 • IEEE 802.11-08/0508r1 • IEEE 802.16m-08/003r3 • IEEE 802 Plenary Tutorial on “WPAN/WLAN/WWAN Multi-Radio Coexistence”, Nov. 13, 2007 Jing Zhu, Intel Corporation

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