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Improving intersystem cell reselection from GERAN to UTRAN

A cell reselection, cell technology, applied in the direction of selection device, radio/induction link selection arrangement, electrical components, etc., can solve problems such as impossible reselection

Active Publication Date: 2007-05-16
NOKIA TECHNOLOGLES OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This makes it impossible to set up a reselection that takes place at a point where the uplink is guaranteed to be operable, while at the same time causing the mobile station to reselect the UTRAN cell as long as both the uplink and downlink are operable (essentially Both UTRAN CPICH RSCP and Ec / No have sufficient levels)

Method used

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  • Improving intersystem cell reselection from GERAN to UTRAN
  • Improving intersystem cell reselection from GERAN to UTRAN
  • Improving intersystem cell reselection from GERAN to UTRAN

Examples

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Embodiment approach

[0034] According to the first embodiment of the present invention, the involved inter-system reselection behavior is realized without signaling changes. In the first embodiment of the present invention, the advantage is that the threshold for inter-system reselection is realized by using target UTRAN cell applicable criteria. Whenever reselection is triggered by existing reselection parameters, the mobile station needs to read the target cell system information, firstly to evaluate the applicable criteria on this cell. According to the invention, for any reselection attempt where the reselection is first triggered but the target cell compliance fails, the mobile station will store the RSCP compliance (or UTRAN RSCP compliance) for that particular cell. This value (i.e. the RSCP applicable threshold), optionally modified with an offset (e.g. using a hysteresis value or taking into account the mobile station's power capabilities), can then be used as Additional reselection crit...

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Abstract

This invention describes a method for a cell reselection by a mobile station from a serving GERAN cell supported by a GSM / EDGE (global system for mobile communications / enhanced data rates for GSM evolution) radio access network (GERAN) to a UTRAN cell supported by a universal terrestrial radio access network (UTRAN). According to a first embodiment of the invention, the intended intersystem reselection behavior is reached without signaling changes. This can be a preferred mode for early implementations because signaling changes always take a longer time to reach the products on the field (both mobile and network updates are normally required). According to a second embodiment of the invention, the flexibility of signaling changes is used for an advantage.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Patent Application Serial No. 60 / 578,639, filed June 10, 2004, and US Application Serial No. 11 / 129,673, filed May 13, 2005. technical field [0003] The present invention relates to inter-system reselection optimization in mobile communication systems, and more particularly relates to cell reselection from GERAN to UTRAN. Background technique [0004] Existing cell reselection from 2G to 3G is based on the Universal Terrestrial Radio Access Network (UTRAN) Common Pilot Channel (CPICH) Ec / No (the energy received from the CPICH per PN chip and at the antenna connector of the mobile station Received overall power spectral density ratio) and thresholds based on the received signal code power (RSCP) level of the UTRAN CPICH relative to the received signal level (RXLEV) of the GSM / EDGE radio access network (GERAN) serving cell. In addition, if the applicable criteria S (Sr...

Claims

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Application Information

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IPC IPC(8): H04Q7/38H04W36/14
Inventor 萨里·尼尔桑阿里·若基南
Owner NOKIA TECHNOLOGLES OY
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