Femtocell BS detection and optimized femtocell List Document

Femtocell BS detection and optimized femtocell List Document Number: IEEE C 80216 m-09/0713 r 1 Date Submitted: 2009 -03 -11 Source: Jin Lee, Inuk Jung, Ronny Yongho Kim, Kiseon Ryu and Jin Sam Kwak Email: {jins 978, cooper, ronnykim, ksryu}@lge. com LG Electronics Feng Xie ZTE Email : xie. feng 2@zte. com. cn Venue: IEEE 802. 16 session #60, Vancouver, Canada Purpose: Corresponding to SDD comment #365, #483 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: <http: //standards. ieee. org/guides/bylaws/sect 6 -7. html#6> and <http: //standards. ieee. org/guides/opman/sect 6. html#6. 3>. 1 Further information is located at <http: //standards. ieee. org/board/pat-material. html> and <http: //standards. ieee. org/board/pat >.

Background q HO from Macro BS to femtocell BS Without a providing neighbor list (OSG/CSG femtocell BSs) to an AMS, discovery (scanning) of Femtocell BSs (as target for handover) becomes difficult. PFemtocell BSs may reside in different frequencies as a macro BS so it may take a long time for the AMS to discover and scan those femtocell BSs. The scanning overhead of all femtocell BSs (in the neighbor list) is critical for initial network entry and handover. PIt would be helpful if a macro(serving) BS provides an optimized femtocell list which only contains femtocell BSs in the vicinity of the AMS. Therefore, section 17. 5. 1 describes that a macro BS can provide accessible femtocell BS list in the vicinity of the AMS with aid of AMS’s report containing initially detected femtocell BSs.

Femtocell BS detection and optimized femtocell List (1) An MS can perform initial scanning with one of possible frequencies. (2) The MS reports detected Femtocell BS information (BS #2 in f 1) from the initial scanning (3) Since a Macro BS has global knowledge on the Femtocell BSs’ topology, the Macro BS can provide the MS with the optimized neighbor list (BS #3 in f 3, BS #4 in f 4) to scan as HO targets. (4) Since the optimized neighbor list can contain (e. g. , BS ID, operating center frequency and system information etc. ) information required for scanning, the MS performs the second step scanning with the received optimized neighbor list.

Proposed SDD Text q 17. 4. 2 Femtocell BS detection An MS can perform initial scanning for femtocell BS(s) with one of possible frequencies. The MS reports detected femtocell BS list to the serving macro BS. Based on the MS’s report, the macro BS provides the MS with an optimized femtocell BS(s) neighbor list which contains information of accessible femtocell BS(s) in the vicinity of MS. Then the MS performs the second step scanning with the received optimized neighbor list for access or handover decision. q 17. 5. 1 HO from Macro BS to Femtocell BS … An MS may scan and report information of surrounding Femtocell BS(s) to the macro BS in order to receive the optimized neighbor list containing information of accessible neighbor CSG/OSG Femtocell BS(s) in the vicinity of MS.