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PLMN frequency search triggered by mobile country code change

A technology of mobile country code and frequency search, applied in the field of PLMN frequency search triggered by the change of mobile country code, which can solve problems such as prolonged time

Active Publication Date: 2011-03-30
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, longer delays between such band searches extend the time required for a mobile UE to detect a new cell when the UE leaves the current geographic area and moves into another geographic area utilizing other frequency bands

Method used

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  • PLMN frequency search triggered by mobile country code change
  • PLMN frequency search triggered by mobile country code change
  • PLMN frequency search triggered by mobile country code change

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0008] figure 1 A mobile user equipment (UE) 10 is shown in wireless communication with a PLMN 100 in a first country. PLMN 100 includes a Node B 102 providing wireless communication services within a cell 104 under the control of a radio network controller (RNC) 106 . The RNC 106 is connected to a Core Network (CN) 108 which in turn communicates with various networks such as the Public Switched Telephone Network (PTSN), the Internet 300 or the like. As the UE 10 moves through the cell 104, in the area of ​​the border between the first country hosting the PLMN 100 and the second country, the UE may establish communication with the PLMN 200 in the second country. PLMN 200 similarly includes a Node B 202 providing wireless communication services within a cell 204 under the control of a radio network controller (RNC) 206 . The RNC 206 is connected to a core network (CN) 208 which in turn communicates with various networks such as the Internet 300 .

[0009] The PLMN 200 can pr...

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PUM

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Abstract

A mobile UE (10) initiates a full search of all supported frequencies upon detecting a change in the Mobile Country Code (MCC) transmitted by a PLMN. The change in MCC indicates the user had crossed a political border, and the spectrum allocated for wireless communication may be different. In one embodiment, the mobile UE (10) stores the current MCC. Upon obtaining an updated MCC, it is compared to the stored MCC. If the updated MCC is different from the stored MCC, the full frequency search is initiated. To prevent excessive searching, with concomitant power consumption, while traveling near a border, the UE waits a predetermined duration after an MCC-initiated full scan before conducting a subsequent full scan, even if the MCC changes within that duration.

Description

Background technique [0001] Wireless communication systems, also known as Public Land Mobile Networks (PLMNs), are well known and widely deployed. Various protocols are in use, such as GSM, CDMA 2000, WCDMA, UMTS and the like. These systems are operated at different frequencies by different service providers, depending on the spectrum allocated and made available by the government of the country in which they are deployed. In particular, many systems utilize frequency division duplexing (FDD), whereby downlink traffic from the network to user equipment (UE) is transmitted on carriers that are separated in frequency from uplink traffic from the UE to the network. Other systems utilize Time Division Duplex (TDD) and carry uplink and downlink transmissions in one frequency band. The frequency bands utilized in one geographic area may be the same or different than the frequencies used in other geographic areas. For example, while most European countries have service providers o...

Claims

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Application Information

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IPC IPC(8): H04W48/16
CPCH04W48/16Y02D30/70
Inventor J·拉姆库尔T·埃克斯泰特
Owner TELEFON AB LM ERICSSON (PUBL)
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