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Network Controlled/Assisted Cell Reselection for Point-to-Multipoint Data Transmission Disclosure Number: IPCOM000020537D
Original Publication Date: 2003-Dec-25
Included in the Prior Art Database: 2003-Dec-25

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Frequent and periodic cell reselection within a GSM (Global System for Mobile Communications) environment has a pronounced negative impact on applications that are requiring a certain configuration and availability of resources to work properly. This is primarily due to the manner in which user mobility for GPRS (General Packet Radio Service) is managed. So e.g., for Multimedia Broadcast/Multicast Services (MBMS), it is of paramount importance that a cell to be selected supports this service in a similar manner which is supported in the current cell. Up to now, a mobile aborts its operation on the old cell (e.g. when the user leaves the radio range of an area), reselects a new cell and attempts to set up a packet data transfer which may fail because the new cell may not have sufficient capacity to support another mobile. The mobile must now wait and try to set up the transfer again or may reselect to another cell which may accommodate its request for a packet data transfer (and MBMS session).