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Method and system for synchronizing up-link

A downlink and link technology, applied in the field of uplink synchronization, can solve problems such as lost communication channels, communication channel degradation, and inability to maintain communication channels temporarily

Active Publication Date: 2006-10-18
GOOGLE TECH HLDG LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In hard handover, the original communication channel cannot be temporarily maintained while establishing a new channel
Both types of handover generally involve difficult, complex procedures that sometimes lead to severe degradation or even loss of the communication channel

Method used

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  • Method and system for synchronizing up-link
  • Method and system for synchronizing up-link
  • Method and system for synchronizing up-link

Examples

Experimental program
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Embodiment Construction

[0014] refer to figure 1 , which is a diagram illustrating a Time Division Synchronous Code Division Multiple Access (TD-SCDMA) frame structure. TD-SCDMA uses unique codes and time slots to separate multiple users of a given base transceiver station (BT). Divide the TD-SCDMA frame into a 10ms long radio frame and a 5ms long subframe. Thereafter, each subframe is divided into seven time slots, and the downlink pilot time slot (DwPTS), including the SYNC_DL field, and the uplink pilot time slot (UpPTS), including the SYNC_UL field, are respectively protected by period (GP) separation. Each TD-SCDMA time slot accommodates a burst of exactly 2560 chips.

[0015] refer to figure 2 , which is a schematic diagram illustrating a communication system 200 including a first base transceiver station (BT1) 205 and a second base transceiver station (BT2) 210. A user equipment (UE) 215 is shown moving from within range of BT1 205 to within range of BT2 210 . UE 215 may be, for example...

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Abstract

A method for carrying out synchronization of up link includes receiving request of switching UE (215) from BT1 (205) to BT2(210) by BT1 (205) at BT2 (210), sending UpPTS by BT2 (210) to UE (215) in order to send synchronous component request such as SYNC-UL field to BT2 (210), receiving synchronous component from UE (215) in assigned UpPTS on receiving power and on receiving time by BT2 (210), sending synchronization regulating information of up link to UE(215) by BT2 (210) based on estimation of receiving power and time at receiving synchronous component in UpPTS from UE (215) by BT2 (210).

Description

technical field [0001] Generally, the present invention relates to uplink synchronization between nodes in a communication system, and more particularly, to a method and system for uplink synchronization in a TD-SCDMA communication system. Background technique [0002] In 2001, Time Division Synchronous Code Division Multiple Access (TD-SCDMA) was accepted as a 3G mobile communication standard in China. TD-SCDMA is an advanced Time Division Multiple Access (TDMA) system that includes an Adaptive Code Division Multiple Access (CDMA) component, bringing many advantages to the end user. By changing the size of various time frames, TD-SCDMA communication system can send symmetrical or asymmetrical data, so as to use communication bandwidth more efficiently. In this way, using the Time Division Duplex (TDD) principle, TD-SCDMA can allocate different numbers of time slots of a 5ms subframe to uplink services or downlink services. For example, for asymmetric services such as Inte...

Claims

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Application Information

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IPC IPC(8): H04B7/26
CPCH04B7/2684H04W56/0005H04W56/009
Inventor 李晨光陈金岳高岩
Owner GOOGLE TECH HLDG LLC
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