WDP offers and used for multiplexing and demultiplexing of source destination port numbers data respectively. The service primitive to send a datagram is TDUnitdata. req with the destination address (DA), destination port (DP), Source address (SA), source port (SP), and as mandatory parameters. Destination and source address are unique user data (UD) addresses for the receiver and sender of the user data. could be MSISDNs (i.e., a telephone number), IP addresses, or any other unique identifiers. The service primitive T-DUnitdata.ind indicates the reception of data. Here destination address and port are only optional parameters. If a higher layer requests a service the WDP cannot fulfil, this error is indicated with the service primitive. An is returned indicating the reason for the T-DError.ind error code (EC) error to the higher layer. WDP is not allowed to use this primitive to indicate problems with the bearer service. It is only allowed to use the primitive to indicate local problems, such as a user data size that is too large. If any errors happen when WDP datagrams are sent from one WDP entity to another, the wireless control message protocol (WCMP) provides error handling mechanisms for WDP and should therefore be implemented. WCMP contains control messages that resemble the internet control message protocol messages and can also be used for diagnostic and informational purposes. WCMP can be used by WDP nodes and gateways to report errors. Typical WCMP messages are destination unreachable (route, port, address unreachable), parameter problem (errors in the packet header), message too big, reassembly failure, or echo request/reply. An additional WDP management entity supports WDP and provides information about changes in the environment, which may influence the correct operation of WDP.
WDP offers source and destination port numbers used for multiplexing and demultiplexing of data respectively. The service primitive to send a datagram is TDUnitdata. req with the destination address (DA), destination port (DP), Source address (SA), source port (SP), and user data (UD) as mandatory parameters. Destination and source address are unique addresses for the receiver and sender of the user data. could be MSISDNs (i.e., a telephone number), IP addresses, or any other unique identifiers. The T-DUnitdata.ind service primitive indicates the reception of data. Here destination address and port are only optional parameters. If a higher layer requests a service the WDP cannot fulfil, this error is indicated with the T-DError.ind service primitive. An error code (EC) is returned indicating the reason for the error to the higher layer. WDP is not allowed to use this primitive to indicate problems with the bearer service. It is only allowed to use the primitive to indicate local problems, such as a user data size that is too large. If any errors happen when WDP datagrams are sent from one WDP entity to another, the wireless control message protocol (WCMP) provides error handling mechanisms for WDP and should therefore be implemented. WCMP contains control messages that resemble the internet control message protocol messages and can also be used for diagnostic and informational purposes. WCMP can be used by WDP nodes and gateways to report errors. Typical WCMP messages are destination unreachable (route, port, address unreachable), parameter problem (errors in the packet header), message too big, reassembly failure, or echo request/reply. An additional WDP management entity supports WDP and provides information about changes in the environment, which may influence the correct operation of WDP.
Mobile-Computing%20notes.docx