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Cell search method of multimedia broadcast/multicast service special carrier frequency

A technology of multimedia broadcasting and cell search, which is applied in the direction of broadcast service distribution, branch offices providing special service devices, and data exchange details.

Inactive Publication Date: 2009-05-13
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The same scrambling code will be used for MS time slots in adjacent cells, which will cause serious intra-frequency interference or inter-frequency interference. UE has no way to distinguish which cell the wireless signal comes from, resulting in failure of downlink synchronization and cell search.

Method used

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  • Cell search method of multimedia broadcast/multicast service special carrier frequency
  • Cell search method of multimedia broadcast/multicast service special carrier frequency
  • Cell search method of multimedia broadcast/multicast service special carrier frequency

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Embodiment Construction

[0041] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and examples, so as to fully understand and implement the process of how to apply technical means to solve technical problems and achieve technical effects in the present invention.

[0042] A kind of improved method can solve the problem that above-mentioned method brings, and its improvement is as follows:

[0043] (1) The system stipulates the basic preamble pair (basic preamble pair) that can be used in MS time slots of all MBMS-dedicated carrier frequency cells, and defines the correspondence between the basic preamble code pair and the scrambling code (one code pair may correspond to one scrambling code, It can also be that each basic preamble code in a code pair corresponds to a scrambling code), the network side equipment of the MBMS dedicated carrier frequency cell selects a pair of basic preamble codes as the basic preamble code pair of it...

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Abstract

The invention discloses a cell searching method of multimedia broadcast / multi-spot transport service designated carrier frequency, directing to avoid co-channel interference or intra-channel interference resulted from the usage of the same scrambling codes by adjacent cells MS time slot, the method comprises the steps of: configuring, at user terminals and network sides, contracted fundamental lead code pair designated for multimedia broadcast / multi-spot transport service special time slot, and associated relationship thereof with the scrambling codes, wherein the fundamental lead code pair designated for the special time slot is different than the fundamental lead code pair designated for other service time slots; matching the fundamental lead codes of the special time slot by the user terminal in the process of cell searching, and determining the scrambling codes corresponding to the matched fundamental lead codes after matching the fundamental lead codes, descrambling data portions of the special time slot according to the scrambling codes. The invention, without co-channel or intra-channel interference, realizes downlink synchronization of the user terminal and cell searching at the MBMS designated carrier frequency cell of a TD-SCDMA system.

Description

technical field [0001] The invention relates to wireless communication technology, in particular to a cell search method for MBMS (Multimedia Broadcast / Multicast Service, multimedia broadcast / multicast service) dedicated carrier frequency. Background technique [0002] Now people's demand for mobile communication is no longer satisfied with telephone and message services. With the rapid development of Internet, a large number of multimedia services have emerged. For some of these application services, multiple users can receive the same data at the same time, such as video on demand, TV broadcasting, video conferencing, online education, and interactive games. MBMS technology is proposed to realize the most effective use of mobile network resources. It refers to a point-to-multipoint service in which one data source sends data to multiple users, and realizes network resource sharing, including mobile core network and access network resource sharing, especially the air interf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W4/06H04L12/18
Inventor 艾建勋
Owner ZTE CORP