Abstract: This invention generally relates to secure communications links for data transmission and more particularly relates to data communications links in which asymmetric cryptographic techniques are used to establish a secure link using symmetric cryptography.

Abstract: The present invention relates to scheduling, compression and transcoding of data content for mobile terminals with limited resources. The present invention provides a method of transferring information or content to or from a terminal dependent on a number of parameters associated with the terminal. Such parameters might include its battery level, processing resource status and memory resource status, and the nature of its connection(s) to the network(s) (network performance). Thus for example a terminal with plenty of processor resources but a single narrowband wireless link may implement a high compression ratio in order to improve the file transfer time to the terminal, even if this requires a high de-compression processing overhead. Such a set-up may be changed during a connection session, for example if the battery runs low necessitating reduced processing.

Abstract: The present invention relates to protocol stacks and protocol layers within protocol stacks especially, but not exclusively, for communications terminals such as mobile phones, lap top computers and base stations. The present invention provides a method of modifying a communications protocol for processing a signal provided in a processing apparatus having a processor and memory, the protocol defined by a plurality of protocol layers, at least one layer being in use capable of occupying one of a plurality of predetermined states wherein each state has associated with it a predetermined functionality including message dependent transition of the layer into one of the other states; the method comprising loading a software update module into memory, the module arranged to receive and process one or more messages corresponding to one of said states of one of said layers, the module comprising at least one message dependent transition unit operable to cause transition of said layer into another state.

Abstract: The present invention relates to wireless communications, and in particular although not exclusively, to networks of indoor collocated or overlapping wireless coverage areas especially those intended for operation in unlicensed spectrum such as the Industrial Scientific and Medical (ISM) bands.

Abstract: The present invention relates to protocol stacks and protocol layers within protocol stacks especially, but not exclusively, for communications terminals such as mobile phones, lap top computers and base stations.