Blind scanning Document Number: IEEE S802.16m-09/1401 Date Submitted: 2009-07-13 Source: Byung Moo Lee, Do-Young Kwak, Si Young Heo,

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Blind scanning Document Number: IEEE S802.16m-09/1401 Date Submitted: Source: Byung Moo Lee, Do-Young Kwak, Si Young Heo, Yongjoo Tcha, Jong-Sik Lee, and Seong-Choon Lee KT Sung-Yeop Pyun, Ju-yeop Kim and Dong-Ho Cho KAIST Min Suk Kang Howon Lee, and Bang Chul Jung KI ITC Re: IEEE 80216m-09_0028r1 Call for contributions on Project m- “Support for Femtocell BS” in m amendment working document Purpose: To be discussed and adopted in m AWD Notice : This document does not represent the agreed views of the IEEE Working Group or any of its subgroups. It represents only the views of the participants listed in t he “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 cont ained 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 I EEE 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 contri bution may be made public by IEEE Patent Policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: and. Further information is located at and.

Introduction There are some cases that blind scanning is necessary –There is no available white list on AMS. –When AMS tries to access to a CSG femtocell which is not registered in white list, etc Exhaustive search causes a lot of problems –There may exist hundreds of candidates for the target femtocell. –This may cause a serious problem, because MS should make a great effort to scan for many possible femtocells in the whole bandwidth and consume a lot of resources. This may give a significant impact on handover delay. Key idea –If MS knows the lowest preamble index and the difference between the highest preamble index and the lowest preamble index, the scanning would be much more efficient –Give scanning boundary to MS to reduce the scanning overhead

Proposed blind scanning procedure

Scanning parameter set determination –In the phase of scanning parameter set decision, when a femtocell is deployed, it decides a scanning parameter set (FA index and preamble index) –The new femtocell may obtain the scanning parameter sets of neighboring femtocells through broadcasting of neighboring femtocells. –The femtocell decides the preamble index which is the minimal number among the available parameter sets. –Then, it decides FA index which is available to be used with the choosing the minimal preamble index. –After deciding the scanning parameter set, the femtocell calculates the maximum difference of the preamble indices used in neighboring cells and minimum preamble index used in cells for each FA index. –Then, the femtocell may report the information which contains the preamble index and FA index the femtocell selects, the maximum difference (Dmax), and minimum preamble index for each FA index to the overlay ABS over backbone network.

Proposed blind scanning procedure Handover scanning –The ABS may collect all minimal preamble indices and maximum differences (Dmax) for all FA indices from femtocells within coverage of the ABS. –Then, for each FA index, the ABS may choose the smallest value used in the femtocells (PAmin) and the largest value among the collected set of maximum difference (Ndiff), respectively. –The ABS may unicasts, multicasts or broadcasts the blind scanning indication which contains PAmin and Ndiff for all FA indices to AMS –In the phase of handover scanning, after receiving the blind scanning indication which contains PAmin and Ndiff, for a given FA index, MS may start to scan femtocells from the lowest preamble index (PAmin) to the highest preamble index. –After finding first femtocell BS whose preamble index is PAfirst, the MS may scan for preamble indices from PAfirst + 1 to PAfirst + Ndiff then stops scanning. –Once the MS detects the target femtocell and handover conditions are met, MS may try to handover from the serving ABS to the target femtocell BS.