Method for defining compression header fields to a packet data in a layer convergence protocol of a mobile communications system, said method comprising: defining a context for modules compression and decompression as one of the parameters the connection for controlling the operation of said compression and decompression, define a length for a context identifier used to identify connections data packets in the data transmission between the compressor and decompressor, defining said length the maximum number of packet connections compressed data transmitted on one connection, identify each data packet connection by its own context identifier. characterized by signaling the maximum number of simultaneous connections packet data, defined for each radio bearer made to an entity of a system móvilesque communications to establish a new connection data packet decides which radio bearer it will be associated, and govern the mobile communications system in response to exceeding the number of data packet connections allowed by the maximum value of the context identifier length, to define a new radio bearer for connections extra data packet.
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