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Synchronous channel configuration method, cell search and access method in TDD system

A technology of synchronous channel and configuration method, which is applied in the field of communication, can solve the problems of long cell search time and large cell search time overhead in TDD system, and achieve the effect of reducing time overhead

Inactive Publication Date: 2008-08-13
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Therefore, it can be seen from the technical solutions described above that the current related cell search technology, whether it is the cell search of the TDD system or the cell search of the FDD system, only sends basic synchronization information and broadcast information within its basic spectrum range. , that is: the TDD system uses its two-way working spectrum to deliver the basic synchronization signal and cell broadcast information of the system in the downlink time slot in a time-division manner, and the FDD system uses the downlink spectrum in its paired spectrum to deliver the basic synchronization signal of the system and cell broadcast information; in addition, the TDD system is limited by the period of the wireless frame structure and the flexibility of the up / down conversion of the frame structure, and the number of SCHs that can be delivered by the TDD system in one wireless frame is significantly less than that of the FDD system. , this method of sending basic synchronization signals and cell broadcast information results in a longer cell search time in the TDD system than in the FDD system, that is to say, the time overhead for cell search in the TDD system is relatively large

Method used

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  • Synchronous channel configuration method, cell search and access method in TDD system

Examples

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no. 1 example

[0038] In this embodiment, a method for configuring a synchronous channel in a time division duplex system is provided. In this method, while the basic synchronization channel and the broadcast channel are configured on the basic frequency spectrum of the time division duplex system, the auxiliary synchronization channel (SCH) and the broadcast channel (BCH) are configured on the auxiliary frequency spectrum, wherein the auxiliary frequency spectrum is used Spectrum for downlink transmission.

[0039] It should be noted that different cells use the same frequency point or a group of different frequency points to carry the auxiliary synchronization channel and the auxiliary broadcast channel.

[0040] In addition, the encoding methods of the auxiliary synchronization channel and the basic synchronization channel are the same or different; the encoding methods of the auxiliary broadcast channel and the basic broadcast channel are the same or different; the broadcast information ...

example 1

[0044] Network side according to figure 2 (b) SCH and BCH are configured on TDD basic spectrum 202 and auxiliary spectrum (also called spread spectrum) 201 . That is, on the auxiliary spectrum 201, several auxiliary SCH_A 301a / b and BCH_A 302a a / b are transmitted using the frequency spectrum f2 shown in the figure.

[0045] Auxiliary SCH_A 301a / b can have the same coding method as basic SCH 101a, or can adopt a different coding method from basic SCH 201a; auxiliary BCH_A 302a a / b can have the same coding method as basic BCH 102a, or can use a different coding method from basic BCH 102a different encoding methods. The auxiliary BCH_A 302a / b may carry the same broadcast information as the basic BCH 102a, or may carry different broadcast information from the basic BCH 102a.

[0046] The auxiliary SCH_A 301a has a time delay δ relative to the basic BCH 102a. The time delay δ is used for the conversion from the spectrum 202 to the frequency spectrum 201 when the terminal is rece...

example 2

[0050] Network side according to figure 2 (c) On the auxiliary spectrum (also called spread spectrum) 201, that is, using the frequency spectrum f2 shown in the figure, only several auxiliary SCH_A 301a / b are transmitted.

[0051] The auxiliary SCH_A 301a has a time delay δ relative to the basic BCH 102a. The time delay δ is used for conversion from the spectrum 202 to the spectrum 201 when the terminal is receiving. The value range of the time delay δ is: greater than 1 microsecond and less than 10 milliseconds. The secondary SCH_A 301a may also determine the delay δ relative to the primary SCH 101a.

[0052] In a radio frame period, relative to the radio frame of the TDD system, the number and sending time of the auxiliary BCH_A 302a are fixed. In addition, in the mobile communication system, different cells may use the same frequency point to carry the auxiliary SCH_A 301a, or may use a group of different frequency points to carry the auxiliary SCH_A 301a.

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Abstract

The invention provides a synchronous channel configuration method in time division duplex system, in the method, basic synchronous channel and radio channel are allocated on the time division duplex system basic spectrum, at the same time, supplementary synchronization channel and radio channel are allocated on supplementary spectrum, wherein the supplementary spectrum is used in downlink transmission spectrum. In addition, the invention also provides a community search method, which can use the method of simultaneous channel configuration. Therefore, the invention sends the SCH signal and / or the BCH signal by a downlink spectrum excepted for the TDD basic spectrum, which breaks restriction which wireless frame structure cycle and frame structure up / down linefeed flexibility is to thenumber of the TDD system send-down SCH and BCH, thus greatly reducing time cost the TDD system in the community search.

Description

technical field [0001] The present invention relates to the communication field, and more particularly, relates to a synchronous channel configuration method, a cell search method and a cell access method in a time division duplex system. Background technique [0002] With the introduction of spectrum dedicated to broadcasting in the mobile communication system (for example, the Media FLO system launched by Qualcomm) and the emergence of multi-mode terminals (for example, GSM / TD-SCDMA terminals), mobile communication networks and mobile terminals have a wide range of spectrum The use of is developing in the direction of diversification and integration. The comprehensive use of paired and non-paired spectrum not only expands the service capability of the system, but also creates conditions for further improving the performance of the system. For example, through the comprehensive use of TDD (Time Division Duplex, Time Division Duplex) basic spectrum And spread spectrum, can ...

Claims

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Application Information

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IPC IPC(8): H04B7/212H04B1/707H04Q7/38H04W48/16
Inventor 刁心玺
Owner ZTE CORP
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