1. 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, Email: yli2@sta.samsung.com Phone: +1-972-761-7903yli2@sta.samsung.com Jung Je Son, Anshuman Nigam Samsung Electronics Andreas Maeder, Linghang Fan Email: Andreas.Maeder@nw.neclab.eu; Linghang.Fan@EU.NEC.COMAndreas.Maeder@nw.neclab.eu; Linghang.Fan@EU.NEC.COM NEC Jin Lee, Kiseon Ryu, Ronny Kim Email: {jins978, ksryu, ronnykim}@lge.com {jins978, ksryu, ronnykim}@lge.com LG Electronics Venue:IEEE Session #61 Base Contributions: Re: Change Request for IEEE 802.16m SDD, Section 15 Purpose: Discussion and Approval 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. 2 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.

3. 3 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

4. 4 FA information to help MS scan femtocells in LDC mode (2/3) An example AI UAI time AI UAI AI UAI time AI UAI time Femto1 @ FA1 Regular mode Femto2 @ FA2 LDC mode Femto3 @ FA3 LDC mode FA 3 Scan others time MS FA 2 FA3 Scan othersFA2 Preamble others AI: available interval UAI: Unavailable interval

5. 5 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.

6. 6 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.