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Method of Cell Selection and Reselection in Mobile Communication Systems

IP.com Disclosure Number: IPCOM000020530D
Published in the IP.com Journal: Volume 3 Issue 12 (2003-12-25)
Included in the Prior Art Database: 2003-Dec-25
Document File: 1 page(s) / 41K

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

Frequent and periodic cell reselection within a GSM (Global System for Mobile Communications) environment has a pronounced negative impact on applications that are especially sensitive to momentary interruptions or jitter of downlink data flow. This is primarily due to the manner in which user mobility for GPRS (General Packet Radio Service) is managed. For Multimedia Broadcast/Multicast Services (MBMS), where often only short clips are transmitted, a cell change during an ongoing transmission means a significant degradation of the service. If pictures are to be transmitted, the application usually can not recover and the information is lost. Up to now, it is not really possible to hide the impact of the interruption of data during the transmission of streaming applications while changing the cell of a mobile communication system.

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© SIEMENS AG 2003 file: 2003J15493.doc page: 1

Method of Cell Selection and Reselection in Mobile Communication Systems

Idea: Werner Kreuzer, DE-Muenchen

Frequent and periodic cell reselection within a GSM (Global System for Mobile Communications) environment has a pronounced negative impact on applications that are especially sensitive to momentary interruptions or jitter of downlink data flow. This is primarily due to the manner in which user mobility for GPRS (General Packet Radio Service) is managed. For Multimedia Broadcast/Multicast Services (MBMS), where often only short clips are transmitted, a cell change during an ongoing transmission means a significant degradation of the service. If pictures are to be transmitted, the application usually can not recover and the information is lost.

Up to now, it is not really possible to hide the impact of the interruption of data during the transmission of streaming applications while changing the cell of a mobile communication system.

In the new approach, the user equipment (UE) is aware that an MBMS session is ongoing. Due to the nature of this service, only short clips are expected to be transmitted. Additionally, the length of a clip could be signaled to the UE prior to the transmission. If the UE is to perform a cell reselection in normal operation, it delays the reselection - and avoids an interruption of the service - in case the remaining download time is below a certain threshold. By using this method, ser...