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Quick Paging IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE S802.16maint-08/139r1 Date Submitted: 2008-05-14 Source: Havish.

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Presentation on theme: "Quick Paging IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE S802.16maint-08/139r1 Date Submitted: 2008-05-14 Source: Havish."— Presentation transcript:

1 Quick Paging IEEE Presentation Submission Template (Rev. 9) Document Number: IEEE S802.16maint-08/139r1 Date Submitted: Source: Havish Koorapaty, Per ErnstromVoice: Ericsson, 8001 Development Drive, RTP, NC Venue: Session #55 Maintenance Group Base Contribution: C802.16maint-08/139r6 Purpose: Review and discuss in support for adoption of C802.16maint-08/139r6 Notice: This document does not represent the agreed views of the IEEE 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 IEEEs name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEEs 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: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: and. Further information is located at and.

2 Introduction to Quick Paging Quick paging signal –Mechanism to extend standby time of MS –Used in CDMA2000 and WCDMA Indication to selected mobiles to read the full paging message that occurs in a subsequent frame. –Absence of quick paging signal implies system will not send a full page Significantly shorter duration of message –Lowers the wake-up time of the MS –Lowers the time the RF part of receiver is on

3 WiMAX Signal Structure Preamble, DL-MAP and data allocation need to be read for paging message Preamble uses only every third subcarrier Quick Paging Signal could be used on other subcarriers

4 Effect on Legacy MS Preamble Reception of Low Power Signal (20 dB below preamble)

5 For 10 MHz, preamble has 568 empty spaces –Use Walsh-Hadamard code of length 512: 512 codewords Orthogonal codes work well at low SNR Low complexity decoding method using the FWT –Use a PN mask to avoid spectral peaks For 5MHz, length 256 Walsh-Hadamard code can be used Good channel estimates are available from the known preamble –Use bi-orthogonal code based on WH codewords and their inverses Number of addressable groups: 1024 for 10 MHz, 512 for 5 MHz –Each group can be assigned a BWH codeword –If received, then full paging message will be read Quick Paging Signal Design

6 System Performance Evaluation Performance evaluation with System and Link Simulations Link and System Simulation methodology –600 uniformly distributed MS used –100 channel realizations per MS –100 codeword and noise realizations per channel realization –Get long-term path gain values for MS from different base stations Feed to link simulation –Generate preamble and quick paging signal from each base station and scale according to path loss –Apply radio channel (Ped B) –Generate additive noise –Receive quick paging signal on own BS – practical channel estimation, error covariance estimation –Log error events

7 Performance Evaluation Parameters AspectValue Number of Cells/Sites57/19 Reuse1/1 (1/3 for preamble) Path Loss Model log(d) (similar to ITU Vehicular) Site-to-Site Distance2.8km Penetration LossNone Shadowing Standard Deviation8dB Shadowing Correlation Distance100m Bandwidth10 MHz FFT Size1024 Transmit Power (for Preamble)20 W Noise Figure9 dB Channel ModelPedestrian B Relative Power of Paging Signal-20dB Codeword Size512

8 Performance Metrics Probability of Missed Detection (Pmiss) –Codeword is sent, but MS misses receiving codeword –Full Paging message is missed Probability of False Alarm (Pfalse) –Different codeword is sent, but MS receiver mistakenly identifies codeword as own –MS will read full paging message –System behavior is unaffected, but impact on MS battery life Tradeoff between Pmiss and Pfalse with appropriate thresholds

9 Performance Results Miss probability may be reduced using interference cancellation while keeping false alarm probability largely unchanged



12 Text Modifications Summary Add quick paging as a supported feature in section Mobility Features Supported Add quick paging TLV to sections DREG-CMD (de/reregister command) message and MOB_SLP-RSP (sleep response) message Add section with TLV description for assigned codewords Add quick paging parameters to DCD channel encodings Add text in MAC sections , and describing quick paging Add following PHY sections – defining sub-carriers used for quick paging – defining bi-orthogonal Hadamard encoding – defining quick paging modulation

13 Conclusions Design for quick paging signal in unused preamble space Negligible impact on existing functions involving preamble Performance evaluation shows reliable reception of quick paging signal Significant energy savings with use of quick paging signal Functionality is applicable to Sleep and Idle modes in IEEE : text proposal provided

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