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Method and system for remaining ascending synchronization

A communication system and a supreme technology, applied in the field of communication, can solve problems such as detection performance degradation, adjacent cell interference, collision, etc., and achieve the effect of reducing occupied resources, avoiding network resources, and achieving good detection performance.

Active Publication Date: 2008-04-02
DATANG MOBILE COMM EQUIP CO LTD
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AI Technical Summary

Problems solved by technology

The disadvantages of the contention-based method are: competition will bring collisions, resulting in a decrease in detection performance; the transmitting UE generally uses open-loop power control to obtain better access performance, and transmits signals with as high a power as possible. It is easy to cause interference to adjacent cells
The problem with this method is that it increases system resource overhead, and only reference signals are transmitted in each subframe, resulting in low resource utilization

Method used

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  • Method and system for remaining ascending synchronization
  • Method and system for remaining ascending synchronization
  • Method and system for remaining ascending synchronization

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Embodiment Construction

[0050] The present invention provides a method for maintaining synchronization between UE and Node B in three situations, one is to use uplink data or uplink pilot signal to maintain synchronization when there is uplink data transmission; the other is to use uplink signaling of feedback information when there is downlink data transmission Keep synchronization; the third is to trigger the uplink pilot signal to keep synchronization when there is no information interaction.

[0051] In LTE, according to the standard protocol 25.813, the UE state is divided into LTE_ACTIVE (active) and LTE_IDLE (idle) states. In the LTE_ACTIVE state, it can be divided into two states: Exchange Traffic (data traffic interaction) and No Traffic (no data traffic interaction). In the Exchange Traffic state, the UE and Node B perform data interaction. After data interaction, the UE also It is necessary to keep the LTE_ACTIVE state for a period of time, that is, in the No Traffic state. If there is a n...

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Abstract

The present invention discloses a method for keeping the uplink synchronization in the long-term evolving system and the system, which causes the UE and Node B keep uplink synchronization in the TDD LTE system and reduce the spending of the system resource as much as possible. The Node B in the invention receives the uplink information transmitted by the UE; the Node B confirms the time advance amount TA according to the received uplink information and transmits the TA adjusting information to the UE when the TA is larger than the threshold value; and the UE sends TA to do updating to the local uplink according to the TA adjusting information in order to keep the uplink synchronization. Besides, the UE in the on-data flow quantity interaction state transmits uplink pilot signal to the Node B in the assigned time-frequency resource with the existing uplink resource. The system comprises the UE and the Node B connected with the UE, wherein the Node includes a receiving unit, a measuring unit and a transmitting unit.

Description

technical field [0001] The invention relates to the communication field, in particular to a method and system for maintaining uplink synchronization. Background technique [0002] In the long-term evolution solution (LTE) of the 3rd generation mobile communication system, due to the movement of the user equipment (UE) or sudden strong interference, the UE and the base station (Node B) will be out of synchronization. However, maintaining the uplink synchronization state is a basic condition for the UE to communicate normally with the Node B. [0003] At present, many companies have proposed corresponding solutions, a solution based on competition, and an uplink synchronous random access channel is designed, which is mainly used for application for uplink shared channel resources. When the UE has uplink signaling, use the uplink signaling as the measurement signal for uplink synchronization maintenance; when the UE does not send uplink signaling, trigger an uplink synchroniza...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/26
CPCH04W56/0005
Inventor 于洋孙韶辉张瑞齐王映民
Owner DATANG MOBILE COMM EQUIP CO LTD
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