Abstract: A method and apparatus for avoiding packet reordering in multiple-class, multiple-priority networks. The present invention provides a queue implementation technique that can be used in multiple-class, multiple-priority networks such as Differentiated Services networks to ensure that packets are serviced without reordering. The queue implementation technique maintains performance isolation between different classes under some scheduling disciplines and can identify scheduling disciplines which do not degrade the performance seen by the lower priority traffic classes.

Abstract: A robust IP/UDP/RTP header compression mechanism is provided to correctly reconstruct IP/UDP/RTP headers in the presence of packet losses and errors of unreliable networks. The header compression mechanism may include a compressor/de-compressor implemented for operation similarly to RFC 2508 but designed specifically to address robustness when employed in lossy and error-prone networks. The robust header compression scheme requires that, when a second-order difference of a field is non-zero, not only a particular RTP packet whose second-order difference is non-zero is sent with the new first-order difference, but also those following packets are also sent with the new first-order difference as long as: (a) a period pre-determined by factors such as channel characteristics (e.g., link round-trip time RTT/inter-packet separation); or (b) a positive confirmation is received by the compressor that the new first-order difference has been correctly received.

Abstract: The invention is a method and a network which provides mobile terminals (12) with the address of and access to application services. A network in accordance with the invention includes a plurality of mobile terminals which transmit and receive information transmitted through the network (100, 200); at least one storage (52), coupled to the network, which is accessible by the plurality of mobile terminals that provides services to the mobile terminals; and a directory storage (102), coupled to the plurality of mobile terminals, which stores addresses of the at least one storage and which provides in response to a communication at least one address of the at least one storage to at least one of the mobile terminals with which the plurality of terminals may communicate to obtain service therefrom.

Abstract: A method of authenticating a paging request within an IP environment, said environment comprising a paging area having a plurality of access router (PAR, AR) and at least one mobile node (MN), said method comprising the steps of: sharing a session security key (K) between said mobile node (MN) and an access router (PAR) to which said mobile node (MN) has been previously attached to; receiving (S1) a packet incoming for said mobile node (MN) by said previous access router (PAR), wherein said mobile node (MN) is in a dormant mode; submitting (S2) a paging request to all other access routers (AR) of said paging area by said previous access router (PAR) about the packet which came in, thereby also distributing said session security key (K); generating (S3) authentication parameters according to a predetermined process by an access router (AR) to which said mobile node (MN) is currently attached to; submitting (S4) said paging request from said access router (AR) to said mobile node (MN) including said authenticat