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Doc.: IEEE 802.22-06/0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 1.

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Presentation on theme: "Doc.: IEEE 802.22-06/0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 1."— Presentation transcript:

1 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 1 Draft PHY/MAC Specification for IEEE IEEE P Wireless RANs Date: Authors: Notice: This document has been prepared to assist IEEE 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. 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 Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures including the statement "IEEE standards may include the known use of patent(s), including patent applications, provided the IEEE receives assurance from the patent holder or applicant with respect to patents essential for compliance with both mandatory and optional portions of the standard." Early disclosure to the Working Group of patent information that might be relevant to the standard is essential to reduce the possibility for delays in the development process and increase the likelihood that the draft publication will be approved for publication. Please notify the Chairhttp://standards.ieee.org/guides/bylaws/sb-bylaws.pdf Carl R. StevensonCarl R. Stevenson as early as possible, in written or electronic form, if patented technology (or technology under patent application) might be incorporated into a draft standard being developed within the IEEE Working Group. If you have questions, contact the IEEE Patent Committee Administrator at NameCompanyAddressPhone John BenkoFrance Telecom Soo-Young Yoon Chae Carlos CordeiroPhilipsUSA Wen GaoThomson Wendong Ramon Chang-Joo Hak-Sun KimSamsung Stephen Joy LaskarGeorgia Institute of Ying-Chang LiangInstitute for Infocomm Research Eli

2 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 2 Co-Author(s): NameCompanyAddressPhone Paul PigginCygnus Myung-Sun Soon-Ik Gwang-Zeen Sung-Hyun Bub-Joo Chung Gu KyungHi Yun Hee Moon Ho HyungRae Martial BellecFrance TelecomFrance Denis CallonnecFrance Luis EscobarFrance Francois MarxFrance Patrick PiratFrance Kyutae Lim Georgia Institute of Technology Youngsik Hur Georgia Institute of Technology

3 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 3 Co-Author(s): NameCompanyAddressPhone Jianwei Linjun Lv HuaweiChina Lai Qian HuaweiChina Jianhuan Wen HuaweiChina Vincent K. N. LauHKUST Hong Kong Roger S. ChengHKUST Hong Kong Ross D. MurchHKUST Hong Kong Wai Ho MowHKUST Hong Kong Khaled Ben Letaief HKUST Hong Kong Edward K. S. AuHKUST Hong Kong Peter W. C. ChanHKUST Hong Kong Chee Wei Anh Tuan Peng-Yong Yonghong Changlong Ashok Kumar Francois Zander Zhongding Wing Seng

4 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 4 Co-Author(s): NameCompanyAddressPhone Yufei Brian Fred Jeff Kevin Tim David GrandblaiseMotorolaFrance Dagnachew Kiran ChallapaliPhilipsUSA Vasanth Monisha Zion HadadRuncomIsrael Duckdong Chung Kim Ashish Yoo Kihong Kim Samsung Electro- Mechanics

5 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 5 Co-Author(s): NameCompanyAddressPhone Seongsoo LeeSamsung Jeong Suk LeeSamsung Chang Ho LeeSamsung Wangmyong WooSamsung David MazzareseSamsung Electronics Co. Ltd.Korea Baowei JiSamsung Telecom Changhoi Koo Samsung Telecom America USA Yinong Ding Samsung Telecom America USA Liwen Kyeongsoo George Max MuterspaughThomson Hang LiuThomson Paul KnutsonThomson Josh KoslovThomson

6 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 6 Protection of Incumbents First and foremost requirement is protection of incumbent services –Broadcast TV –Part 74 Subpart H Low Power Auxiliary Stations (i.e., wireless microphones) Database and location techniques are not part of this interoperability standard Mechanisms for incumbent awareness and avoidance are built into the MAC and PHY –Distributed spectrum sensing –Quiet period and fast/fine sensing management –Measurements and clustering –Detection algorithms –Spectrum management

7 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 7 Protection of Incumbents Protection of incumbents is the overarching requirement and so deserves priority in the presentation However, since this protection is so inextricably woven into the system, the PHY and MAC have to be introduced as a setting for these mechanisms Therefore, discussion of this topic will be distributed throughout the presentation

8 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 8 Presentation Outline System Overview PHY Overview MAC Overview

9 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 9 Presentation Outline System Overview PHY Overview MAC Overview

10 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 10 Public IP Network Service Provider IP Network HA AAA ACR WRAN BS CPE WRAN Hierarchy AAA : Authentication, Authorization and Account Server ACR : Access Control Router HA : Home Agent

11 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 11 WRAN Repeater TV Transmitter WRAN Base Station Wireless MIC Wireless MIC WRAN Base Station : CPE : WRAN Base Station Typical ~33km Max. 100km Deployment Scenario

12 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 12 System Overview OFDMA both in uplink and downlink 2K FFT mandatory TDD mandatory, FDD optional 10 msec frame duration 16-frame superframe QPSK, 16-QAM, and 64-QAM, transformed-QPSK Rate 1/2 through rate 5/6 coding sub-channels per TV channel Data rate range from 4.8Mbps to 72.6Mbps (with optional channel bonding and channel aggregation)

13 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 13 ParametersSpecificationRemark Frequency range54~862 MHz Service coverageTypical range 33 km Bandwidth Mandatory: 6, 7, 8 MHz Optional fractional use of TV channel and channel bonding up to 3 contiguous TV channels. Channel aggregation of discontiguous channels. Data rate Maximum: 72.6 Mbps Minimum: 4.8 Mbps Maximum of 23 Mbps for 6 MHz Spectral Efficiency Maximum: 4.03 bits/s/Hz Minimum: 0.81 bits/s/Hz Single TV channel BW of 6 MHz ModulationQPSK, 16QAM, 64QAM mandatory Transmit powerDefault 4W EIRP Multiple AccessAdaptive OFDMAPartial bandwidth allocation FFT Mode2K mandatory 1K / 4K optional, 2K / 4K / 6K for channel bonding Cyclic Prefix Mode 1/4, 1/8, 1/16, 1/32 DuplexTDD mandatoryFDD supported Network topologyPoint-to-Multipoint Network System Parameters

14 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 14 Presentation Outline System Overview PHY Overview MAC Overview

15 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 15 FFT Mode for WRAN Systems

16 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 16 Subcarrier Spacing and Symbol Duration (2K) GI = T FFT /32GI = T FFT /16GI = T FFT /8GI = T FFT /4 T SYM = T FFT + T GI (  s) 6MHz MHz MHz MHz based channels (6, 12 and 18 MHz) 7 MHz based channels (7, 14 and 21 MHz) 8 MHz based channels (8, 16 and 24 MHz) Inter-carrier spacing,  F (Hz) = = = FFT/IFFT period, T FFT (  s)

17 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 17 Channel Bonding Structure 6K FFT over 3 TV channels –2K per TV channel –Null out the outer carriers for 1 or 2 TV channels Fixed inter-carrier spacing –Several implementation possibilities 12 MHz 6 MHz 18 MHz

18 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 18 Fractional Bandwidth Usage If wireless microphones are in operation in TV channel, the WRAN systems must clear the entire TV channel The number of used sub-carriers is proportional to the fractional bandwidth The fractional BW mode is identified by using a Preamble Example: Other CR user

19 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 19 Subchannelization Subcarrier Allocation Adjacent Subcarrier Permutation Adjacent Subcarrier Permutation Uniformly Distributed Subcarrier permutation Uniformly Distributed Subcarrier permutation Scattered type Band type Adjacent Subcarrier Permutation Distributed Subcarrier permutation Each subchannel consists of a group of adjacent subcarriers Bands in good state are selected for data transmission Multiuser diversity Require more feedback information than distributed subcarrier allocation type Each subchannel consists of distributed subcarriers within an OFDM symbol Only the average CINR over all subcarriers is required For users with high frequency selectivity or far distant users

20 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 20 Nc = # of sub- CH Nd = # of data carriers/ sub-CH Np = # of pilots/sub- CH Nd+Np# of used carriers Remarks ETRI *30 = 1680Worst CH Medium CH Best CH I2R32484 or 652 or 5452*32=1664 or 54*32=1728 Philips32486 (would agree to 4) 5454*32=1728 OFDMA Parameters: Status Runcom has also proposed single channel parameters based on e PUSC (1680 used sc) and FUSC (1702 used sc)

21 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 21 Frame Structure

22 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 22 Frame Element Definitions Preamble – synchronization, channel estimation –Long training sequence and optional short training sequence –There’s also an upstream burst preamble FCH – frame control header, info on size of DS- and US- MAP and channel descriptors (PHY characteristics) MAPs – resource scheduling info for user bursts Ranging – timing offset, power adjustment UCS – urgent coexistence situation, incumbent detection report BW Request – self-explanatory SSS - sliding self-coexistence slots – used by coexistence beacon to improve coexistence with neighbors BCH – burst control header for upstream – ID information

23 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 23 Superframe Structure

24 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 24 Superframe Element Definitions Preamble – synchronization, channel estimation –Two symbols long with 5 short and 2 long training sequences SCH – superframe control header – info on system type, channel, channel bonding, quiet periods (time to, duration of)

25 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 25 Channel Coding Convolutional Coding (mandatory) –Rate ½, other rates by puncturing –Constraint length 7 Optional Advanced Codes –Duo-binary Convolutional Turbo Coding (DB-CTC) see –Low-Density Parity Check Coding (LDPC) see –Shortened block turbo codes (SBTC) see

26 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 26 Sensing Proposed methods still remain to be evaluated and compared (Tiger Team) Several techniques were introduced at previous meetings and have been included in the PHY spec in section 8.8 –Energy detection (full bandwidth or pilot) –Multi-resolution spectrum sensing and Analog auto correlation –PN511 or PN63 sequence detection –Segment sync detector –Cyclostationary feature detection –Spectral correlation –Optimal radiometer Primary waveforms are DTV and analog FM for wireless microphones – TG1 beacon in MAC Section x –More on this later

27 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 27 Multiple Antenna Options The following options are under consideration (Sec. 8.10) –Equal Gain Transmit Beamforming Using Codebooks –Downlink Closed Loop SDMA –Adaptive Beam-Forming Techniques –Space Time Block Coding (STBC) –Combined Diversity/Spatial multiplexing/Delay Management –Virtual MIMO Final decisions on which ones are included will be based on performance and complexity Please also refer to Samsung contribution on EIRP analysis MAC already provides support for multiple antennas

28 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 28 Presentation Outline System Overview PHY Overview MAC Overview

29 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 29 Reference Architecture (Channel Aggregation support) Spectrum Manager – facilitates use of non-contiguous channels (channel aggregation) – responsible for maintaining global view of target RF spectrum – assigns spectrum to MAC/PHY modules

30 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 30 MAC View of Frame PDU – protocol data unit CRC – cyclic redundancy check Header – PDU length, connection ID, encryption

31 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 31 MAC Frame Slotted Structure Each frame is formed by an integral number of MAC slots –1 MAC slot = 1 modulation symbol Boundary between upstream and downstream is adaptive to accommodate traffic asymmetry

32 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 32 Network Entry and Initialization BS initialization… –Consult TV usage database and regional WRAN information database to identify candidate channels –Perform sensing to confirm vacancy of channels –Establish operation on a vacant channel The CPE will… –Scan a previous list of candidate channels or all downstream channels until it finds a valid downstream signal –After acquiring the SCH, sense on all relevant channels surrounding operating channel –Obtain upstream and downstream parameters and perform initial ranging See sections

33 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 33 Network Entry and Initialization The CPE needs to be sure that its communications will not cause harmful interference before it first transmits If a CPE inside of a protected contour can both detect the incumbent and synchronize to the co-channel BS, it will not associate with the BS However, if allowed it may send a short message to alert the BS to the presence of the incumbent See section 6.15

34 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 34 Ranging Downstream management –If CPE CINR falls below the range required for the specified burst profile, the CPE requests transition to a new burst profile –See section Upstream management –Consists of two procedures: Initial ranging allows a CPE to join a network and acquire correct Tx parameters Periodic ranging allows the CPE to maintain upstream communications –For periodic ranging, timers must be maintained for each channel in DFH operation –The algorithm is described in section

35 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 35 QoS The service model is similar to that specified in The primary purpose is to define transmission ordering and scheduling over the air interface Packets traversing the MAC interface are associated into a service flow as identified by the connection identifier (CID) A service flow is characterized by a set of parameters such as latency, jitter, and throughput assurances See section 6.20.x

36 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 36 CH-1 MAP CH-3 MAP time Burst #1 Burst #3 Burst#2 Burst#5 Burst#4 Burst #6 DS Multi-CH Resource Allocation by CH Grouping: The size of both FA-1 MAP and FA-3 MAP can be reduced by using the Channel Grouping and Matching which is managed by SM (Spectrum Manager) Channel Grouping and Matching CH Matching ’ 3’ CH Matching: To select (US and DS) active set 1 for individual CPE CPE 1 CPE 2 CPE 3 CH Matching BS CH Grouping: To select a group of CPE’s that are assigned to the same channel CH-1MAP Burst #1 Burst #3 Burst#2 Before Matching and Grouping After Matching and Grouping

37 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 37 Dynamic Frequency Hopping An optional feature when the number of vacant channels exceeds the number of neighboring BSs Avoids inband quiet periods and interruptions to service by hopping to other vacant channels for operation while sensing is performed on the previously occupied channels and other channels Regular periodic channel maintenance is combined with DFH to minimize frequency switching latency

38 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 38 Clean Sensing for DFH “N+1” Rule and Phase Shifting operation 3 WRAN systems share 4 channels using DFH with clean sensing See section for more info

39 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 39 Incumbent Coexistence See section x A comprehensive set of measurement and spectrum management commands is available Urgent coexistence situations can be reported through fields in the MAC header or through the UCS slots Sensing can be in-band (where quiet periods are required) and out-of-band (no quiet period required) In-band incumbent detection can take place during two phases –Quiet Periods; and –Normal System Operation (e.g., opportunistic in-band sensing)

40 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 40 Incumbent Coexistence During Quiet Period Notification Phase –BS limits its downstream traffic so that ample time is allocated for CPEs to report –The BS indicates this to the CPEs through the MDP (measurement data preferred) field in the US-MAP –CPEs with allocated BW that did not detect the incumbent can still use the US to transmit data –Unresponsive CPEs are pursued to determine the source of the problem –Only CPEs without US BW should use the UCS slots During Normal System Operation –CPEs with allocated BW send a BLM-REP (bulk measurement report) with priority over other pending traffic –If there’s insufficient BW, the CPE may use fields in the MAC header –CPEs without allocated BW use UCS slots

41 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 41 Incumbent Detection Recovery To recover from an UCS, protocols are needed that enable the network to restore normal operation Backup channels are relied upon to quickly re-establish communications –Backup channels should be completely disjoint from the affected channel to minimize the probability that the backup channel is also impaired In the event that no vacant channels remain, CPEs periodically monitor the status of a channel and inform the BS via the MAC header fields if the channel becomes available again See section x

42 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 42 Class B CPE for Part 74 Protection TG1 is currently preparing to address enhanced protection mechanisms for hard-to-detect Part 74 low power auxiliary devices One possible method is to use a special class (class B) CPE as a beacon This CPE is initially tuned to the desired channel of Part 74 operation If no SCH are detected after a timeout, the channel is assumed unoccupied by WRANs –But it will continue to search for SCH during normal operation If SCH are detected, the QP info is used to build a QP map for all area WRANs to find QP opportunities Beacons are transmitted during the best QPs to maximize detection See section x

43 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 43 Hidden Incumbent Systems If a CPE cannot detect the BS due to strong interference from an incumbent, a “hidden incumbent” situation results – See section The BS can remedy this situation by periodically broadcasting out-band signaling on other vacant channels The CPE can respond on one of these channels and alert the BS to the hidden incumbent situation The BS responds to the alert by changing the operating channel

44 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 44 Quiet Period Management for Sensing Sensing is a two-stage process –Stage 1: Fast sensing –Stage 2: Only if needed, perform fine sensing The fast sensing is performed in-band only Based on the fast sensing outcome, BS determines the need for the next fine sensing and the required time The synchronization of overlapping BSs makes this scheme highly reliable

45 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 45 Opportunistic In-band Sensing Use common “sensing-eligible” frames to do in-band sensing A “sensing-eligible” frame is: –A frame with no traffic, i.e. no US or DS traffic –A frame at which the backlogged traffic (both US and DS) is less than the remaining capacity in the current superframe and no sensing frame has been allocated in the superframe –The last frame of the superframe and no sensing frame has been allocated in the superframe A “sensing-eligible” frame is designated as a sensing frame if it is not marked for use for out-of-band sensing

46 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 46 Distributed Quiet Period When multiple CPEs are operating on different aggregate channels, a hidden node can result if the CPEs only sense on their active channel Meanwhile the BS is broadcasting on all aggregated channels and interference to the incumbent results

47 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 47 Distributed Quiet Period This situation can be remedied by distributing the quiet period Each channel is interrupted only once using DQP, while simultaneous QP would require 3x interruption in this example See section

48 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 48 Self-Coexistence CMAC addresses self-coexistence amongst overlapping cells in two mandatory ways: –BS beacon (i.e., SCH) based –The Coexistence Beacon Protocol (CBP), which enables: Sharing in time and frequency Dynamic resource offering and renting Etiquette for channel assignment CBP follows a best effort model that: –Allows for direct BS-to-BS communication and communication via CPEs –The overlapping BSs synchronization mechanism makes it highly reliable –Can be implemented either over-the-air or via a backbone –Allow either one-way or two-way (i.e., negotiation) communication The CBP packet consists of a preamble (different than the superframe preamble) followed by the SCH with the CT (content type) field set and a CBP MAC PDU

49 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 49 Spectrum Contention Three options are described Spectrum Renting/Offering (Sec ) –Offerers share active and candidate channel sets with potential renter –Renter chooses from union of neighbor’s candidate channels and informs neighbors of choice and required rental time Credit Tokens (Sec ) –Neighboring BSs trying to share a resource negotiate rental fees using psuedo-monetary credit tokens from an initial reserve –By sharing resources, a BS can accumulate tokens to build up its reserve for future rentals (incentive for sharing)

50 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 50 Spectrum Contention On-Demand Spectrum Contention (Sec ) Negotiation based distributed spectrum sharing mechanism Contention number exchange and comparison Iteratively driven by internal or external demands for spectrum sharing Allow different contention strategies and flexible strategy adaptation

51 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 51 Channel Switch Procedure WRAN system builds a candidate channel list using distributed sensing When incumbent users and other WRAN systems are detected in the current operating channel, –The BS selects a channel CHselect from the candidate channel list, either randomly or based on some algorithms –Randomly selects a wait time twait from a time window [ Tmin, Tmax ] –Starts a wait timer with Twait as the expiration time –Advertises the channel selection using a backhaul channel or WRAN air interface before jumping to CHselect Meanwhile the WRAN system senses CHselect for incumbent signals and other WRAN systems –If the channel CHselect is still idle/available, it jumps to CHselect when the wait timer expires –If incumbent signals or other WRAN systems exist in CHselect, it goes back to the beginning to select another channel from the candidate channel list or its previously operated channel if occupied by incumbent users If collision occurs after channel switch, it increase tmax and goes back to the beginning to select another channel from the candidate channel list or its previously operated channel if not occupied by incumbent users –Otherwise, it decreases Tmax and removes CHselect from the candidate channel list

52 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 52 MAC Adaptive Antenna System (AAS) Support Frame structure simultaneously supports AAS and non-AAS traffic CPE uses preamble for downstream sync Network entry and initialization –CPE decodes FCH if able –Alternatively, BS can reserve portion of superframe as initial ranging/contention slots Channel state via reciprocity or feedback –MAC control messages –Piggyback on existing measurement reports

53 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 53 CPE Maximum Transmit Power Control (TPC) CPE can operate co- or adjacent channel provided it is outside of the protected contour On other channels surrounding a TV channel, a CPE must abide by TPC defined by an EIRP profile All active TV channels in the area within ±15 channels will contribute to the profile Flowcharts and examples are shown in x

54 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 54 Pending Items Some items reviewed by the proposal team did not reach consensus (for a variety of reasons) in time for the May meeting but are still considered worthy of continued consideration These items need to be exposed to the WG so they are not “in the dark”

55 doc.: IEEE /0069r0 Submission ETRI, FT, Huawei, Ga Tech, I2R, Motorola, NextWave, Philips, Runcom, Samsung, ST Micro, Thomson May 2006 Slide 55 Pending Items PHY –FT: OQAM/IOTA –I2R: Block spreading –Runcom: Macro-diversity MAC –FT: OFDMA subcarrier slot sensing –Huawei MAC management message Guard interval for quiet period Efficient control signaling for downlink allocated resources information broadcast Effective and flexible structures for CPE CSIT collection –I2R Hidden incumbent problem Adaptive TDD –Samsung: Uninterrupted frame synchronization and channel estimation –STM Inter-BS communications DFH community


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