Method and apparatus for radio link failure recovery in a telecommunication system

A radio link and fault recovery technology, applied in wireless communication, orthogonal multiplexing systems, electrical components, etc., can solve problems such as useless user end user context, recovery delay, etc.

Active Publication Date: 2010-12-15
TELEFON AB LM ERICSSON (PUBL)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the selected cell may not have a user context for

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  • Method and apparatus for radio link failure recovery in a telecommunication system
  • Method and apparatus for radio link failure recovery in a telecommunication system
  • Method and apparatus for radio link failure recovery in a telecommunication system

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Embodiment Construction

[0029] One embodiment of the RLF recovery mechanism considered herein focuses on the case of handover failure. Handover is an important mechanism for maintaining continuity of user connections. In LTE, robust and fast handover is a challenging task. One reason is that in an LTE system, a handover between two eNBs implies a complete disconnection of the user terminal to its serving cell before the user terminal attempts to access a neighboring cell. In other words, hard handover is used in 3GPP LTE, unlike the first release of 3GPP UMTS which implements soft handover. Another reason is the distributed architecture of the LTE system, which requires coordination between neighboring eNBs.

[0030] In the case of an unsuccessful handover, a mechanism is defined in which the user terminal can transmit a message to a new cell in its area and thereby inform the network about its radio link failure (RLF) based on the terminal, in the new cell resume the connection in progress. The ...

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Abstract

The teachings presented herein enable a user terminal to perform a fast recovery from a radio link failure. In one aspect, the improvement in recovery time is achieved by commanding or otherwise causing the user terminal to perform radio link failure (RLF) recovery at a cell that is known to possess the user context, while considering that this cell should yield good radio conditions (if not the best) to the user terminal. A cell may be predefined for use by the user terminal in recovering its radio connection. Based on providing signal strength thresholds to the user terminal, for use in determining whether to use a predefined cell for reconnecting to the network, the user terminal attempts RLF recovery first in the predefined cell. By providing user context to the predefined cell in advance of a recovery attempt by the user terminal, the time for recovery is lessened. Note that the user terminal also may infer which cells are preferred.

Description

technical field [0001] The present invention relates to radio link fault recovery in a telecommunication system, such as a wireless communication network, and in particular to reducing fault recovery time. Background technique [0002] A common task in radio communication systems is to deal with the behavior of user terminals when a radio link failure (RLF) is detected. In known schemes for recovering from radio link failures, a user terminal randomly accesses the cell it is in. Afterwards, during the allocation of resources from the network, the mobile terminal sends a message informing the network that it has encountered a radio link failure and is attempting to re-establish its connection. In the latest version of the control specification for the Long Term Evolution (LTE) system as standardized by 3GPP, the reconnection message is called "Radio Resource Control (RRC) Connection Re-establishment Request". Specifically, in 3GPP LTE, three messages are exchanged during RL...

Claims

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Application Information

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IPC IPC(8): H04W36/08H04W36/06H04W36/30
CPCH04W36/30H04J11/0086H04W36/32H04W36/305
Inventor K·迪茂M·林斯特伦M·萨格福斯G·米尔德M·卡兹米
Owner TELEFON AB LM ERICSSON (PUBL)
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