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Initial cell search algorithm

A cell, index value technology, applied in the field of synchronization, can solve the problem of indicating no service and so on

Inactive Publication Date: 2007-10-31
INTEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This causes a stall and eventually the UE indicates no service

Method used

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  • Initial cell search algorithm
  • Initial cell search algorithm
  • Initial cell search algorithm

Examples

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Embodiment Construction

[0023] According to an embodiment of the present invention, the cell retrieval synchronization system 10 is shown in FIG. 1 . The system 10 includes a step 1 module 12 , a step 2 module 14 , a step 3 module 16 and a controller 18 to implement synchronization between a user equipment (UE) and a base station. To accomplish this synchronization, the UE utilizes an initial cell search algorithm through the cell search synchronization system 10, which is disclosed in detail as follows.

[0024] The step 1 algorithm of the initial cell search algorithm is accomplished using the step 1 module 12 . Please refer to Fig. 3, this step 1 module 12 comprises two hierarchical Golay correlators (Hierarchical GolayCorrelators) (HGC) 21,22, two absolute value modifiers (AVM) 23,24, a decision circuit 25, standardization circuit 26 , a look-up table 27, a multiplier 28, a splitter 19, and a step 1 comparator 29. The Radix Increased Cosine Filter (RRCFIR) 1 shown is not part of the Step 1 modu...

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Abstract

A system and method for establishing initial synchronization for the link between a UE and a base station in a communication network uses window exclusion logic in order to avoid a deadlock condition upon a detection of the wrong public land mobile network (PLMN). The communication signal is processed in a three step decision process. The first decision step (12) determines a chip offset of the strongest path detected over a frame of samples. In response to the first decision (12), the second step (14) generates a scrambling code group number and slot offset for retrieving the second synchronization code. The third decision step (16) retrieves a primary scrambling code in response to the code group number for synchronizing the UE to the base station.

Description

(1) Technical field [0001] The present invention relates to synchronization between user equipment (UE) and base station. More particularly, the present invention relates to a cell search system utilizing an improved initial cell search algorithm. (2) Background technology [0002] The initial cell search algorithm is used to synchronize the UE with the base station. The UE completes its procedure through a common downlink channel called the Physical Synchronization Channel (PSCH). Please refer to Figure 2, the PSCH has a structure in which a same primary synchronization code (PSC) is transmitted at the beginning of each slot and a secondary synchronization code (SSC) is transmitted in each slot, thus forming 15 different SSCs . As is known to those skilled in the art, a frame having a length of 15 slots can transmit 15 SSCs. [0003] The transmission order of the SSC is based on the number of primary scrambling code groups. For example, in a 512 cell system, there are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L7/00H04L7/02H04Q7/20H04Q7/00H04B7/00H04B1/18H04B17/00H04J3/06H04B1/707H04B7/26H04L7/04H04W48/16
CPCH04W48/16H04W56/00H04J3/0608H04B1/7083H04J11/0069H04B1/707
Inventor 阿帕斯兰·丹米尔唐纳德M·葛礼库
Owner INTEL CORP
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