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System and method using primary and secondary synchronization codes during cell search

A technology of cell search and synchronization code, which is applied in the field of wireless communication, and can solve problems such as troublesome processing requirements

Inactive Publication Date: 2005-03-16
INTERDIGITAL TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This processing requirement is cumbersome

Method used

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  • System and method using primary and secondary synchronization codes during cell search
  • System and method using primary and secondary synchronization codes during cell search
  • System and method using primary and secondary synchronization codes during cell search

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specific Embodiment

[0023] Referring to Fig. 2, it is a subframe 10 according to the present invention. The subframe 10 includes a P-CCPCH 12, a DwPTS 14, a GP 16, an UpPTS 18 and a plurality of data slots 20a to 20n. According to this embodiment of the invention, the P-CCPCH 12 includes a PSC 22 . This point will be image 3 in more detail. Although the PSC 22 indicates the location of the SSC, the PSC correlation peak does not indicate a single precise time at which the SSC was found, but indicates a possible number (such as 16 or 32), and a code offset from how many PSC 22 are present It is functional.

[0024] Such as image 3 As shown, the P-CCPCH 12 contains slots of length 832 chips, which do not contain guard periods. The PSC chip sequence {C0, C1, C2, C3., ..C831} is transmitted simultaneously using each P-CCPCH. Such as Figure 4 Spreading sequences 70, 72 of P-CCPCHs 1 and 2 are transmitted along the PSC chip sequence 74 during the time interval corresponding to the first time s...

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Abstract

A system and method for improved cell searching includes a subframe having a Primary Synchronization Code, which is comment to all Node Bs in the system and is used to indicate the positions of a set of Secondary Synchronization Codes. This greatly simplifies the cell searching procedure and improves cell search performance. In one embodiment, the Primary Synchronization Code is sent in the PCCPCH and the Secondary Synchronization Codes the are sent in the DwPTS timeslot.

Description

technical field [0001] The present invention relates to the field of wireless communication. Specifically, the present invention relates to cell search in a Node B of a Time Division Duplex (TDD) system. Background technique [0002] The current cell search in a Node B of a TDD system is based on the use of downlink synchronization time slots. A ten (10) millisecond frame contains two (2) subframes, each subframe having a duration of five (5) milliseconds. Both subframes in a frame have the same overall structure. Since the subframe is a basic repetitive uplink (UL) and downlink (DL) time structure in a low-chip rate (LCR) TDD system, in principle the "frame" is relatively small in LCR TDD. meaningless. [0003] figure 1 A subframe structure is shown. The subframe includes a Primary Common Control Physical Channel (P-CCPCH), a Downlink Pilot Timeslot (DwPTS), a Guard Period (GP) and an Uplink Guide time slot (Uplink Pilot Timeslot; UpPTS). Usually the first time slot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707H04J3/00H04B1/7077H04B1/7083H04B7/26H04J3/06H04Q7/32H04Q7/36H04Q7/38
CPCH04B2201/70702H04B2201/70707H04B1/7077H04B1/7083H04B2201/70701H04L7/10H04W48/18H04B7/216H04W92/10
Inventor 马立安·鲁道夫
Owner INTERDIGITAL TECH CORP