IEEE 802.16m on Low Duty Cycle Mode of Femtocell Base Stations
Document Number: IEEE C80216m-09_0821r1
Date Submitted: 2009-05-04
Source:
Ying Li, Zhouyue Pi, Baowei Ji,
Jung Je Son, Anshuman Nigam
Email: yli2@sta.samsung.com
Phone: +1-972-761-7903
Samsung Electronics
Andreas Maeder, Linghang Fan
Email: Andreas.Maeder@nw.neclab.eu; Linghang.Fan@EU.NEC.COM
NEC
Jin Lee, Kiseon Ryu, Ronny Kim
Email: {jins978, ksryu, ronnykim}@lge.com
LG Electronics
Venue:
IEEE Session #61
Base Contributions:
Re:
Change Request for IEEE 802.16m SDD, Section 15
Purpose:
Notice:
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Low duty cycle mode for open femtocells
• In current SDD, LDC mode is only for CSG femtocells
– “Besides the normal operation mode, CSG Femtocell BSs may support
Low-duty Operation Mode, in order to reduce interference to neighbor
cells.”
• Propose: LDC mode should be also available for open femtocells
– For an open femto BS, it also has chances to have no active user in its
coverage, due to smaller coverage of femtocell
– If open femtocells have LDC mode, it can help reduce interference to
neighbor cells as well.
– LDC for open femtocell can save energy as well.
2
FA information to help MS scan
femtocells in LDC mode (1/3)
• Femtocells can be at different frequency allocations (FA) .
• FA of femtocells is the key information an MS needs to
shorten the time of searching for femtocells
• MS knowing the active timings of LDC of femtocells can help
MS search for femtocells
3
FA information to help MS scan
femtocells in LDC mode (2/3)
• An example
Preamble
Femto1 @ FA1
Regular mode
time
AI
Femto2 @ FA2
LDC mode
UAI
time
AI
UAI
Femto3 @ FA3
LDC mode
MS
AI
UAI
FA others FA
3
2
Scan others
AI
FA2 others FA3
UAI
Scan others
time
time
AI: available interval
UAI: Unavailable interval
4
FA information to help MS scan
femtocells in LDC mode (3/3)
• Macrocell/femtocell may broadcast/unicast femtocell FAs and
LDC patterns
• Femtocell FAs and LDC patterns may be written in MS white
list.
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Proposed text
15.7 Low Duty Operation Mode
[Remove CSG in the first sentence]
Besides the normal operation mode, CSG Femtocell BSs may
support Low-duty Operation Mode, in order to reduce
interference to neighbor cells.
[Insert the following to the end of 15.7.]
Macrocell/femtocell may broadcast/unicast femtocell FAs and
patterns of low duty cycle over the air.
6