1. Staggered Secondary Carrier Wake-up in Multicarrier Sleep Mode Operation (15.2.7.2.10.1) Document Number: IEEE C80216m-09/2167 Date Submitted: 2009-09-19 Source: Zheng Yan-Xiu, Anderson Chen e-mail: zhengyanxiu@itri.org.tw ITRI Venue: IEEE Session #63.5, Hawaii, USA Call for Reply Comments regarding the 522 marked (unresolved) comments Section 15.2.7.2.10.1 Contention-based random access bandwidth request Base Contribution: This is base contribution Purpose: Propose to be discussed and adopted by TGm for the 802.16m Amendment 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 objective of sleep mode operation is power saving Sleep mode operation in single-carrier 802.16m system –A set of sleep mode parameters is configured –Traffic indication (TRF-IND) is applied to command an MS to receive the buffered traffic now –The MS wakes up to receive DL data at a pre-defined timing if TIMF=0 In multicarrier case, people have already agreed that –Single set of sleep mode configuration parameters is applied –All the control information transactions are proceeded via primary carrier For multi-carrier sleep mode, we can wake up secondary carriers when it is necessary –AAI_TRF-IND indicates the traffic on secondary carrier

3. Question Question 1: Can we reduce responding time with less power consumption? –Yes, the main objective of sleep is still power consumption Question 2: Can we wake up the secondary carrier without wake up time –No, we may need different sets of sleep mode carriers Question 3: Do we like different set of sleep mode parameters? –No, it complicates the system Question 4: Can we avoid transmission congestion induced outage when traffic of multiple users arrive on primary carrier at the same time? –No, it may results in MAC management message loss Question 5: Do we want to change primary carrier frequently if transmission congestion occurs? –No, it increases complexity Question 6: Should ABS receive channel state information from secondary carriers –Yes, it facilitate scheduling

4. 4 Possible Solution Stagger secondary carrier with a fixed or configured time 1.Longer sleep cycle saves more power without enlarging responding time 2.No necessity of wake up time 3.Identical set of parameter between primary and secondary carrier 4.More transmission opportunities avoid transmission congestion 5.No necessity of primary carrier change resulted from traffic congestion 6.Regular channel state information from two carriers is acquired 1. Longer sleep cycle 2. No Wake Up Time 3. Identical Listening Window and Sleep Cycle 4. More Transmission Opportunities 5. No Necessity of Primary Carrier Change 6. Regularly Channel State Information Feedback from Two Carriers

5. Extra Benefits on Receiver Design Multiple antennas and RF chains may serve one CC at the same time –Dynamic Rx Diversity can be applied to enhance the performance –Better receiver diversity gain –Better MCS can be used –More MIMO schemes are usable to boost transmission rate or enhance reception performance Applicable for single RF receiver although we do not allow this concept –Frequency domain diversity gain due to frequency hopping without frequency primary carrier change command –Better diversity gain to anchor based configuration

6. Conclusion Staggering the sleep cycle on secondary carrier reduces power consumption on multi-carrier Identical configuration between primary and secondary is achieved with only one stagger time Traffic congestion can be eliminated due to more transmission opportunities Regular channel state information can be acquired Flexible receiver diversity can be used to boost link throughput

7. 7 Text Proposal Modify the text in section 15.2.7.2.10.1 Sleep mode

8. APPENDIX: CLARIFICATION OF DYNAMIC RECEIVER DIVERSITY

9. Basic architecture –Independent mode Three individual connection –Combining mode One combined connection –Hybrid mode One individual and one combined connection Illustration of Dynamic Rx Diversity RF 1 RF 3 RF 2 BB 1 BB 3 BB 2 analog or digital switch CTRL digital processing circuit RF 1 RF 3 RF 2 BB 1 BB 3 BB 2 CTRL RF 1 RF 3 RF 2 BB 1 BB 3 BB 2 CTRL RF 1 RF 3 RF 2 BB 1 BB 3 BB 2 CTRL Independent modeCombining modeHybrid mode