Abstract: A communication system provides for an expedited Mobile Internet Protocol handoff by allowing a mobile station that is engaged in a communication session with a first access network to obtain Internet Protocol connectivity information associated with a second access network via the first access network. A tunnel is then established between the mobile station and the second access network via the first access network based on the Internet Protocol connectivity information and the mobile station obtains Internet Protocol configuration parameters from the second access network via the established tunnel. By obtaining the Internet Protocol configuration parameters associated with the second access network via the first access network instead of waiting until an air interface connection has been established with the second access network, the mobile station may be more expeditiously handed off to the second access network in the event that such a handoff determination is made.

Abstract: An apparatus and method for throttling server communications in a communication network. Firstly, priorities are defined by a watcher for particular status events. These priorities are then mapped to a list of status events in an event filter. In response to a change of status event of a presentity, the status event is compared to the list of status events of the event filter. If the comparable status event has an associated higher priority, a notification is sent of the change of status event to the watcher with substantially no delay. If the comparable status notification event has an associated lower priority, the status event is filtered in the event filter, and sent to the watcher, as needed, during a predetermined interval. A unique priority code can be defined for events and/or a maximum delay for sending a notification of an event change can be defined for events.

Abstract: A method and apparatus for data transmission is provided herein. In accordance with the preferred embodiment of the present invention a loss-ratio estimator (105) estimates a current loss (L) for a communication channel (108). Once the actual loss for the channel is known, a generator (104) compares the actual loss (L) to a target loss (T). A retransmission control parameter (R) is then adjusted by the generator (104) and output to a transmitter 103 where it is used to control the retransmission behavior and to determine when to abort a bad frame. When a bad frame is aborted, transmitter 103 indicates the abortion to a receiving device (102). A receiver then utilizes the indication to stop reporting the bad frame in all subsequent ACK/NAKs.

Abstract: In the present technique of streaming a main media stream that has been requested, an anti-shadow stream (36) that represents a backup copy of the main media stream (24) is sent along with an output media stream (34) that represents an output copy of the main media stream. The content of the anti-shadow stream (36) is preferably forward-shifted in time from the output media stream (34) so as to provide replacement of loss data of the output stream. Put differently, sequenced data frames of the output stream (34) are delayed by order compared to that of the anti-shadow stream (36).

Abstract: In a wireless code-division multiple access (CDMA) system (100), a talkgroup (101) of subscriber units is provided. A sub-talkgroup (102) of subscriber units, forming a part of the talkgroup is assigned at least one inbound channel (416-417). The talkgroup is assigned outbound channels (415). Members of the sub-talkgroup may simultaneously transmit voice information (410-411) using the at least one inbound channel, which voice information is summed (412) and re-transmitted to the talkgroup using the outbound channels. Voice information is summed so that an individual talker receives summed voice information without the individual subscriber's voice content. Subscriber units in the sub-listengroup are allowed to transmit voice information only after requesting, and receiving, an additional inbound channel.

Abstract: A ENRP server receives registration information from each of a first pool element (PE) and a second PE, wherein the registration information received from each PE includes a same pool handle. The registration information from the first PE further includes a redundancy model. The ENRP server creates a pool that includes both the first and second PEs and adopts, for the pool, the received redundancy model. A pool user (PU) may then access the pool by conveying the pool handle to the ENRP server, and, in response, receiving transport addresses corresponding to the PEs and the redundancy model implemented by the pool. The PU can then access the pool based on the received transport addresses and, when appropriate, the received redundancy model.

Abstract: A method and apparatus for data transmission is provided herein. In accordance with the preferred embodiment of the present invention a loss-ratio estimator (105) estimates a current loss (L) for a communication channel (108). Once the actual loss for the channel is known, a generator (104) compares the actual loss (L) to a target loss (T). A retransmission control parameter (R) is then adjusted by the generator (104) and output to a transmitter 103 where it is used to control the retransmission behavior and to determine when to abort a bad frame. When a bad frame is aborted, transmitter 103 indicates the abortion to a receiving device (102). A receiver then utilizes the indication to stop reporting the bad frame in all subsequent ACK/NAKs.

Abstract: A communication network (100) includes a first server (124) and a second server, such as any of the servers (121-23), connected via a common network (101). First server (124) owns a record data (180) associated with at least one process running for serving a client device (174.) The second server keeps a copy of the record data. First server (124) performs a Hashing function over record data (180) to produce a first Hash value. The second server similarly performs the same or similar Hashing function over the copy of the record data to produce a second Hash value. First server (124) sends the first Hash value to the second server for comparison. If the first Hash value fails to match to the second Hash value, a latest copy of the record data (180) is sent from first server (124) to the second server upon request.

Abstract: The present invention provides a method for evaluating a communication link between a first communication site and a second communication site. The first and second communication sites increment a sent counter and reset a received counter upon sending a message to the other communication site. Each communication site also increments a received counter and reset a sent counter upon receiving a message from the other communication site. When the sent counter exceeds a sent threshold, the communication system site sends an alert that the communication link is down. When the received counter exceeds a predetermined percentage of the other communication site's sent counter, the site sends a message to the other communication site to let the other communication system site know that it is still receiving messages.

Abstract: A method of switching a call to a multipoint conference call includes sending a message (201) from a first terminal (105-T1) to a gatekeeper (102) which provides address translation and control access to a shared network medium (101). The call is initially established as a point to point communication between first terminal (101) and a second terminal (105-TN) over shared network medium (101) while complying with H.323 standard. Message (201) contains a request for the multipoint conference call. The method furthermore includes selecting a multipoint control unit (104) connected to shared network medium (101) to allocate resources for the multipoint conference call, and then switching the call to the multipoint conference call via the allocated resources. Thereby, the initial call is switched to a multipoint conference call without interrupting the initial call.

Abstract: The system for reducing composite beat, composite second order beat and thermal (snow) noise impairments in a television system digitizes individual frames to apply digitized a grey scale values (v.sub.(i,j)) to the pixels in the frames and then applying a spatial filter to a block of pixels including the then current pixel being processed to determine the pixel (P.sub.(min)) with the minimum grey scale value (v.sub.(min)) and the pixel (P.sub.(max)) in the block with the maximum grey scale value (v.sub.(min)). V.sub.(max) -v.sub.min is compared with a threshold value (v.sub.(T)) and if v.sub.(max) -v.sub.min) >v.sub.(T), the value (v.sub.(i,j)) of the pixel being processed remains unchanged, but if v.sub.(max)-v.sub.(min).notgreaterthan.v.sub.(T), a value (v.sub.(av.)) equal to the weighted average value of pixels in the block is used as the grey scale value v.sub.(R-i,j) for the pixel being processed.