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Abstract

A method of operating a mobile radio network in which data is assembled into units by a first convergence protocol (SNDCP) layer prior to transmission of the data to a second; peer convergence protocol (SNDCP) layer. Data is provided to the first convergence protocol layer by one of a plurality of convergence protocol layer users (e.g. PDP entities). The method comprises assigning at least one access point identifier (NSAPI) to each user and exchanging between first and second layers one or more set-up messages (XID), each message containing a data compression/decompression algorithm identifier, a set of parameters for the identified algorithm, and a bitmap of access point identifiers, where the bitmap indicates those access point identifiers which are to make use of the identified algorithm and those which are not.

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