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
ITRI
e-mail: zhengyanxiu@itri.org.tw
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
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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
AAI_TRF-IND with
> positive indication
> multicarrier bitmap= 0000
AAI_TRF-IND with
> positive indication
> multicarrier bitmap= 0001
Primary Carrier
wake-up time
Secondary Carrier
logic index #1
AAI_TRF-IND with
> positive indication
> multicarrier bitmap= 0010
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
Possible Solution
•
Stagger secondary carrier with a fixed or configured time
1.
2.
3.
4.
5.
6.
Longer sleep cycle saves more power without enlarging responding time
No necessity of wake up time
Identical set of parameter between primary and secondary carrier
More transmission opportunities avoid transmission congestion
No necessity of primary carrier change resulted from traffic congestion
Regular channel state information from two carriers is acquired
1. Longer sleep cycle
AAI_TRF-IND with
> positive indication
> multicarrier bitmap= 0010
AAI_TRF-IND with
> positive indication
> multicarrier bitmap= 0000
Primary Carrier
4. More Transmission Opportunities
5. No Necessity of Primary Carrier Change
3. Identical Listening
Window and Sleep Cycle
Secondary Carrier
logic index #1
2. No Wake Up Time
6. Regularly Channel State Information
Feedback from Two Carriers
4
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
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
Text Proposal
• Modify the text in section 15.2.7.2.10.1 Sleep mode
 15.2.7.2.10.1 Sleep mode
……
During the Listening Window, the traffic indication enabled AMS monitors the
traffic indication message with its primary carrier. Upon receiving negative traffic
indication in the traffic indication message, the AMS goes back to sleep mode. If
positive traffic indication is received, the AMS continues to receive any DL data on
the active carrier(s) based on the carrier bitmap information of AAI_TRF-IND. If the
traffic indication is disabled, data transmission and allocation follows the normal
operation during the Listening Window. In this case, the ABS may allocate the DL
data on the active secondary carrier and the AMS receives the data on the active
secondary carrier during the Listening Window. The Listening Window will be
staggered by a fixed time.
7
APPENDIX: CLARIFICATION
OF DYNAMIC RECEIVER
DIVERSITY
Illustration of Dynamic Rx Diversity
CTRL
• Basic architecture
RF1
BB1
digital processing circuit
– Independent mode
• Three individual connection
RF2
BB2
RF3
BB3
– Combining mode
• One combined connection
analog or
digital switch
– Hybrid mode
• One individual and one combined connection
CTRL
CTRL
CTRL
RF1
BB1
RF1
BB1
RF1
BB1
RF2
BB2
RF2
BB2
RF2
BB2
RF3
BB3
RF3
BB3
RF3
BB3
Independent mode
Combining mode
Hybrid mode