Unlock instant, AI-driven research and patent intelligence for your innovation.

Efficient PLMN search order

A technology for searching cells and frequency groups, which is applied in the field of communication systems and can solve problems such as time-wasting cell/PLMN searches

Active Publication Date: 2012-05-30
TELEFON AB LM ERICSSON (PUBL)
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this linear search of all frequency bands of a RAT, the UE may waste time searching for a cell / PLMN in a frequency band that may not be valid when the cell / PLMN can be more easily found in frequency bands of other RATs

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Efficient PLMN search order
  • Efficient PLMN search order
  • Efficient PLMN search order

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] By employing an intelligent search order, the UE can reduce the time required to discover cells (eg, suitable or acceptable cells). Those skilled in the art should understand that a "suitable" cell provides normal services for UEs, while an "acceptable cell" provides services below normal levels for UEs, for example, only calls in emergency situations. After discovering the first cell, when it is necessary to additionally search for a second cell / PLMN, the UE may determine which frequency group(s) are worth searching. Thus, a UE may avoid wasting time searching for cells in a possibly invalid frequency set of another RAT when a cell can be found in the most recently used set of one RAT. A frequency group may be a band group (BG, band group). From the perspective of cell / PLMN selection, a band group is nothing but a group that is regarded as a unit. A typical characteristic of BG is that the included frequencies are all deployed in the same region. Examples of BG are G...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

By employing an intelligent search order, a user equipment in a mobile communication system can shorten the time needed to find a cell / public land mobile network. After a first cell has been found, the equipment can determine which frequencies it will be worthwhile to search when another search is needed for a second cell. The equipment can thus avoid wasting time searching for cells in frequencies of a radio access technology that may not be valid when cells can be found in a most recently used group of frequencies of another radio access technology.

Description

technical field [0001] The present invention relates to communication systems, and more particularly to mobile communication systems. Background technique [0002] As more and more frequencies become available for communication in mobile communication systems, user equipment (UE) such as mobile phones or other remote terminals search for cells and public The amount of time required for a land mobile network (PLMN, publicland mobile network) is increasing. [0003] Mobile communication systems include time division multiple access (TDMA) systems and code division multiple access (CDMA) systems, time division multiple access systems such as cellular radiotelephones conforming to the GSM telecommunications standard and its enhancements (e.g. GSM / EDGE) systems such as cellular radiotelephone systems conforming to the IS-95, cdma2000, and Wideband-CDMA (WCDMA) telecommunications standards. Digital communication systems also include "hybrid" TDMA and CDMA systems, such as cellul...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H04W48/18H04W88/06
CPCH04W48/18H04W48/16H04W88/02
Inventor 约阿希姆·拉姆库勒克里斯蒂安·克里斯托福森马格努斯·卡尔森
Owner TELEFON AB LM ERICSSON (PUBL)