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Method for constituting structure of time slot of DwPCH and UpPCH in TD SCDMA system

A TD-SCDMA and composition method technology, applied in the field of subframe structure, can solve the problems of difficulty in receiving broadcast channels, reducing system capacity, and difficulty in re-searching network cells when starting up, and achieving the effects of increasing coverage and increasing processing delay.

Active Publication Date: 2007-02-21
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the required cell coverage radius exceeds 11.25 kilometers, from the perspective of the UE, beyond this distance, either the uplink UpPTS time slot may be superimposed on the DwPTS time slot position. Due to the near-far effect, other UEs located near the UE may Difficulties in network search and cell re-search when starting up; when the UE's uplink UpPTS will fall on TS0, it will also cause difficulties in receiving broadcast channels for other nearby UEs
Either time slot TS1 will be affected, reducing the overall system capacity

Method used

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  • Method for constituting structure of time slot of DwPCH and UpPCH in TD SCDMA system
  • Method for constituting structure of time slot of DwPCH and UpPCH in TD SCDMA system
  • Method for constituting structure of time slot of DwPCH and UpPCH in TD SCDMA system

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Embodiment Construction

[0015] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0016] figure 1 It is a schematic diagram of the subframe structure of the usual TD-SCDMA system, in which: the number of chips occupied by each time slot is marked on the figure; TS0 and DwPTS are always downlink; UpPTS and TS1 are always uplink.

[0017] figure 2 It is a schematic diagram of the composition structure of DwPTS in the usual TD-SCDMA system protocol, image 3 It is a schematic diagram of the composition and structure of DwPTS proposed by the present invention. As shown in the figure, in the DwPTS composition structure proposed by the present invention, the SYNC_DL of 64 chips is placed before the guard interval of 32 chips.

[0018] Figure 4 It is a schematic diagram of the structure of UpPTS in the TD-SCDMA system protocol, Figure 5 It is a schematic diagram of the structure of the UpPTS proposed by the present invention. As shown in...

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Abstract

The invention varies the distribution of protective chips in DwPCH and UpPCH in TD-SCDMA system, and increases the protective chip numbers between SYNC_D and SYNC_UL so as to ensure the time interval between SYNC_UP and TS1. The architecture thereof increases the coverage area of TD-CDMA system, doesn't change the numbers of TD-SCDMA subframe, doesn't influence the receiving demodulation algorithm of UE and Node B and doesn't increase the process delay of UE and Node B.

Description

technical field [0001] The present invention relates to a subframe structure in a TD-SCDMA system, in particular to a composition method of the DwPCH and UpPCH time slot structures of the TD-SCDMA system. Background technique [0002] Normally, the frame structure of TD-SCDMA sets a 75μs guard interval (96chips) between DwPCH and UpPCH, which is used to distinguish uplink and downlink time slots, so that terminals that are far away can realize uplink synchronization. Among them, DwPCH (downlink pilot channel, located in downlink pilot DwPTS), including 32 chips (chips) guard time slot and 64chips downlink synchronization code (SYNC_DL), UpPCH (uplink pilot channel, located in uplink pilot UpPTS), Including the uplink synchronization code (SYNDC_UL) of 128chips and the guard time slot of 32chips. In the protocol [1], the TD-SCDMA frame structure is as follows figure 1 shown. (Protocol [1] refers to 3GPP TS 25.221, 'Physical channels and mapping of transport channels onto p...

Claims

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Application Information

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IPC IPC(8): H04J13/00H04J3/00H04W56/00
Inventor 程健庄嘉宜林敬东
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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