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Method and apparatus for adjusting a reselection timer and cell ranking criteria, and reporting degraded signal measurement of a serving cell

A technology for serving cells and signal measurement, which is used in wireless communications, electrical components, etc.

Inactive Publication Date: 2010-03-03
INTERDIGITAL TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, signal measurements (e.g., signal strength, signal quality) are used to overcome the shortcomings of existing WTRU speed detection mechanisms

Method used

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  • Method and apparatus for adjusting a reselection timer and cell ranking criteria, and reporting degraded signal measurement of a serving cell
  • Method and apparatus for adjusting a reselection timer and cell ranking criteria, and reporting degraded signal measurement of a serving cell
  • Method and apparatus for adjusting a reselection timer and cell ranking criteria, and reporting degraded signal measurement of a serving cell

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Embodiment

[0152] CLAIMS 1. A wireless communication method for adjusting ranking criteria of a serving cell associated with a wireless transmit / receive unit (WTRU), the method comprising:

[0153] performing signal measurements of the serving cell;

[0154] If the signal measurement result of the serving cell exceeds a first threshold, setting the serving cell hysteresis value as a first value;

[0155] If the signal measurement result of the serving cell is less than the first threshold and greater than a second threshold for a first time interval, setting the serving cell hysteresis value to a second value;

[0156] If the signal measurement of the serving cell is less than the second threshold for a second time interval, setting the serving cell hysteresis value to a third value; and

[0157] After the serving cell hysteresis value is set to one of a first value, a second value, and a third value, adjusting the ranking standard of the serving cell based on the serving cell hysteresi...

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Abstract

Various methods for adjusting a reselection timer and cell ranking criteria are disclosed. The ranking criteria of a serving or neighbor cell, or a reselection timer in a wireless transmit / receive unit (WTRU), is adjusted based on how a serving cell signal measurement, (e.g., signal strength, signal quality), compares to a plurality of thresholds over a time interval. In another method, cell ranking criteria is adjusted based on a hysteresis value and a scaling factor when a maximum number of reselections is exceeded and a high mobility factor is detected. Furthermore, a method of reporting cell signal measurements is disclosed, whereby a time-to-trigger time (TTT) interval is started when the neighbor cell signal measurement rises above a reporting range threshold. If the serving cell signal measurement falls below a serving cell threshold, the TTT interval is adjusted and thereby a measurement report is transmitted during the TTT interval.

Description

technical field [0001] This application relates to wireless communications. Background technique [0002] The 3rd Generation Partnership Project (3GPP) is currently launching the Long Term Evolution (LTE) project to bring new technologies, new network architectures and configurations, and new applications and services to wireless cellular networks in order to provide improved spectral efficiency, reduced latency Time, faster user experience and richer applications and lower cost services. The purpose of LTE is to realize the Evolved Universal Terrestrial Radio Access Network (UTRAN). This concept applies to LTE and likewise to all other Universal Mobile Telecommunications System (UMTS) systems such as Release 99, High Speed ​​Downlink Packet Access (HSDPA), High Speed ​​Uplink Packet Access (HSUPA), High Speed ​​Packet Access Access (HSPA) Enhanced or any other version. [0003] In UMTS systems, when a cell is camped on by a WTRU, the WTRU periodically searches for a bett...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W36/00
Inventor S·索马桑德朗M·萨摩尔
Owner INTERDIGITAL TECH CORP
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