Abstract: Disclosed is a method for encrypted communications. A first IPsec endpoint selects a security association (SA) from a security association database (SAD) by using a selector and then extracts an indexing parameter from SA. The indexing parameter is used to determine an active key location from a key storage database (KSD). Data packets are then encrypted using a key from the active key location. The first IPsec endpoint also forms a security parameter index (SPI) in a header of the data packet by using a keyID from the active key location and transmits the encrypted data packet with the header indicating the SPI to a second IPsec endpoint.

Abstract: A method for indicating padding in a digital mobile radio is disclosed. The method comprises receiving a packet comprising a header and a defined length blocks portion. The defined length blocks portion comprises payload and a padding portion. The padding portion comprises padding and a payload pad count field. The method further indicates by a pad field in the header to examine the payload pad count field to determine an amount of padding for the padding portion of the defined length blocks portion. The method further indicates an amount of padding for the padding portion in the payload pad count field.

Abstract: A method for scanning a TDMA channel by a mobile station in a wireless communications landscape is disclosed. A mobile station detects RF energy on a TDMA channel to detect activity in the detected RF energy. The mobile station maintains knowledge of previous activity on the channel. If activity is present on the channel, the mobile station performs inspection of the activity to determine whether the activity is activity of interest, wherein the activity is activity of interest based on a comparison of the activity with the previous activity. The mobile station aborts the inspection of the activity, if activity is not present on the channel and the mobile station aborts the inspection of the activity, if the determined activity is not activity of interest.

Abstract: A method and apparatus of managing a memory (2) having a number of pages (5) involves mapping the physical pages (5) to corresponding pages (4) in a logical address space (1) using a map table (3). When the number of pages utilised by an application increases or decreases, or if an application is deleted or a new application is loaded, the physical pages used by the remaining applications are unchanged, but the logical pages are moved so that the logical pages used by a single application are contiguous and so that the unused pages are contiguous. Thus, after moving the logical pages, the mapping of the logical pages to the physical pages is updated and a free page pointer (6) indicates the next available free logical page.

Abstract: A memory management method (44) for a memory having program contexts including an active program context in an active region and inactive program contexts in an inactive region. Each program context has a first and a second part. Second parts of the active program context are separated by a contiguous memory space comprising a free memory block and a common data parameter store. In operation, the method swaps (50) a location of the second part of the active program context with the contiguous memory. A swapping step (54) is then effected to swap a location of a the inactive program context with the active program context and any program context therebetween. Another swapping step (56) is then effected to swap a location of a second part of the inactive program context with the contiguous memory space, after which the inactive program context becomes currently active.

Abstract: A method of detecting illegal execution of code sequences includes the steps of: setting an active identifier to a first sequence identifier of a first code sequence, executing at least part of the first code sequence, calling, from the first code sequence, a second code sequence having a second sequence identifier, providing (20) a caller sequence identifier and a callee sequence identifier, checking (21) whether the callee sequence identifier is the same as the second sequence identifier, checking (23) whether the caller sequence identifier is the same as the active identifier, and generating (27) an alarm signal if either of the checks provide incorrect results.

Abstract: A memory management method (44) for a memory having program contexts including an active program context in an active region and inactive program contexts in an inactive region. Each program context has a first and a second part. Second parts of the active program context are separated by a contiguous All memory space comprising a free memory block and a common data parameter store. In operation, the method swaps (50) a location of the second part of the active program context with the contiguous memory. A swapping step (54) is then effected to swap a location of a the inactive program context with the active program context and any program context therebetween. Another swapping step (56) is then effected to swap a location of a second part of the inactive program context with the contiguous memory space, after which the inactive program context becomes currently active.