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Synchronization adjustment method and system

A technology of synchronous adjustment and synchronous offset, applied in the field of communication, can solve problems such as wasting downlink physical resources and difficulty in carrying SS

Inactive Publication Date: 2008-07-02
CHINA ACAD OF TELECOMM TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0011] However, it can be seen from the above analysis that the existing TD-SCDMA system has a corresponding SS synchronization control message for each uplink channel. Although this can ensure effective synchronization control, it needs to consider the corresponding information when adding a new uplink channel. How the SS message is carried
In addition, when a new uplink channel is required for subsequent evolution, if there is no corresponding downlink channel, it will encounter the problem of SS bearer difficulty, or a certain amount of downlink physical resources will be wasted

Method used

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Embodiment Construction

[0058] The invention proposes a centralized control synchronous adjustment method. That is, the synchronization adjustment is for the UE, not for each uplink channel.

[0059] figure 1 It is a schematic diagram of the subframe structure of the TD-SCDMA system. In the TD-SCDMA system, a radio frame period is 10ms, which is divided into two identical subframes of 5ms. Each wireless subframe is divided into 7 business time slots and 3 special time slots: downlink pilot time slot (DwPTS, Downlink PilotTime Slot), guard interval (GP, general protect) and uplink pilot time slot (UpPTS , UplinkPilot Time Slot).

[0060] TS1 and several subframes after it can be uplink time slots. For a certain UE, the data in one time slot must be sent at the same time, otherwise the time difference of different code channels will cause unnecessary interference. In addition, the time difference between different uplink time slots should also be fixed, equal to the difference between the time slo...

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Abstract

The invention provides a synchronous adjustment method, comprising the processes: a preliminary and starting sending time Tbegain of an uplink time gap is obtained and the time of time deviation volume T Delta is added in the Tbegain to send uplink data for base station; the time deviation volume T Delta is a mean value of a time difference between a plurality of actual receiving time of up link channels and uplink starting time gap; the sending time of the uplink channel is adjusted according to synchronous migration command fed back from the base station so as to finish the synchronous adjustment. Meanwhile, the invention also provides a system which can realize the synchronous adjustment method and a base station as well as a terminal which compose the system. The technical proposal of the invention can save channel resources and reduce complexity for realizing.

Description

technical field [0001] The invention relates to the communication field, in particular to a TD-SCDMA system synchronization adjustment method and a base station and a terminal constituting the system. Background technique [0002] Uplink synchronization in the current Time-Division Synchronization Code Division-Multiple-Access (TD-SCDMA, Time-Division Synchronization Code Division-Multiple-Access) system includes two parts: [0003] 1. Establishment of uplink synchronization [0004] After the user equipment (UE, User Equipment) is powered on, it must first establish downlink synchronization with the cell, and then start to establish uplink synchronization. When the UE randomly accesses, although it can receive the downlink pilot time slot (DwPTS, Downlink Pilot Time Slot) signal of the base station, it does not know the distance from the base station (Node B), so the uplink transmission of the UE cannot reach the Node B synchronously. b. Therefore, in order to reduce int...

Claims

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Application Information

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IPC IPC(8): H04J3/06H04B7/26H04J13/02
Inventor 周海军
Owner CHINA ACAD OF TELECOMM TECH
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