Patent attributes
A telecommunications network comprises a sending entity (22) and a receiving entity (24) which communicate over a radio interface (26). The sending entity (22) comprises a compressor (40) and a message formatter (34). The compressor (40) in turn comprises a sending entity compression dictionary (60) and dictionary update decision logic (62). The compressor (40) compresses a message to obtain a compressed message to be sent over the radio interface (26) to the receiving entity (24) and also determines a compression factor for the message. The compression factor is based on similarity of the message to contents of the sending entity compression dictionary. The dictionary update decision logic (62) makes a decision whether the compression factor justifies updating of a receiving entity decompression dictionary (70). The message formatter (34) includes, in the compressed message, an update indication regarding the decision. The receiving entity (24) has a decompressor (50) which comprises the receiving entity decompression dictionary (70) and decompression dictionary update determination logic (72). The decompressor (50) decompresses the compressed message to obtain a decompressed message. The decompression dictionary update determination logic (72) uses the update indication to ascertain whether to use the decompressed message to update the receiving entity decompression dictionary (70). In one example illustrative embodiment, the compressor (40) uses a SigComp compression scheme to compress the message to obtain the compressed message, and the message formatter (34) sets a bit flag in a SigComp portion of the compressed message as the update indication.
