Agenda Item : Source : Mitsubishi Electric Corporation Title : Evaluation of cell search in the compressed mode

1. Abstract At #6 Hannover meeting, we proposed inter-frequency measurement patterns for UTRA-FDD to UTRA-FDD cell search. Although all compressed mode patterns for IFHO is moved to informative Annex in RAN1#7bis meeting, the information about the performance using certain pattern is very useful to consider IFHO especially for UTRA FDD to UTRA FDD patterns that has not been reported. This document reports interim simulation results of search performance. In RAN1#7 meeting, 2 modes of measurement are defined for UTRA FDD to UTRA FDD IFHO[1], those are the selection mode and the reselection mode. In the selection mode, UE will try to make cell search using stage 1, 2, 3. On the other hand, in the reselection mode, it begins monitoring the power using stage 3 with a priori knowledge of the scrambling code and timing. In [1], 9 patterns are defined for the purpose of flexibility, 7 for the selection mode and 2 for the reselection mode. The property and purpose of each pattern is summarized briefly as follows: Pattern 1 to 5 uses 7-slot TGL. Pattern 6 and 7 use 14slot TGL. Using 14-slot TGL may improve cell search time. On the other hand, using 7-slot TGL will cause less interference on the system. The difference between pattern (1,2), (4,5) and (6,7) is observation period, characterized by TGP2. Namely, pattern 1, 4 and 6 monitor 4 groups of TGL 3 times per super frame. These are convenient to fast search with sacrifice a little big amount of interference to another user. On the other hand, pattern 2, 5 and 7 monitor 4 groups of TGL in every 2 super frames. These are convenient to less interference, but search speed is slower. The difference between pattern (1,2) and (4,5) is; pattern (1,2) can make frame-wide observation which could improve stage 2 performance, on the other hand, pattern (4,5) observes the same position of the frame, but it might be easy to make compressed frame because of the same pattern. This difference is characterized by TGD. Pattern 8 and 9 is used for the UE during reselection mode. Only 7-slot TGL is defined for these patterns. The purpose of this contribution is to show whether TGL7 is enough or not for stage 2 in the selection mode, and to show whether TGL7 is enough or not for the reselection mode. In this section, we will show cross-correlation property for 2nd stage …