Motorola Corporation

Avaya Inc.

Rajendra A Panchal

Alexander Rozenstrauch

Jay P Jayapalan

Ajaykumar R Idnani

Edgardo L Promenzio

Yi-Cheng Liu

Emek Sadot

Mark Hamlen

Alex Rozenstrauch

During a communication session () for a multi-network user platform (which communication session is presently occurring in a first network and is terminable by a Session Initiation Protocol server as comprises a part of that first network), one establishes () in the first network a Session Initiation Protocol instance as corresponds to the communication session. Thereafter, and particularly following a handoff of the communication session from the first network to a second network, one uses () the Session Initiation Protocol instance to maintain communications with the Session Initiation Protocol server such that the Session Initiation Protocol server does not terminate the communication session.

Method and apparatus to facilitate persistence of a handed-off communication system

During () a communication session for a plurality of user platforms wherein at least one of the user platforms is on hold and wherein the communication session is presently occurring in a first network and is terminable by a Session Initiation Protocol server as comprises a part of that first network, one establishes () in the first network a Session Initiation Protocol instance as corresponds to the communication session wherein the Session Initiation Protocol instance comprises, at least in part, session context information for the user platform that is on hold. Then, following a handoff of bearer support of the communication session from the first network to a second network, one uses () the Session Initiation Protocol instance to maintain the hold status of the user platform that is on hold with the Session Initiation Protocol server subsequent to the handoff such that the Session Initiation Protocol server does not terminate the communication session.

Method and apparatus to facilitate use of a session initiation protocol instance to support on-hold session status

An enterprise network includes at least one communication device-, an Open Systems Interconnect (OSI) Layer 2 switch, and a corresponding enterprise switch. The communication device-is connected to at least one of an access point-and a respective port-of the Layer 2 switch. The enterprise network includes a plurality of Emergency Location Information Numbers (ELINs) corresponding to differing segments of the enterprise network. The Layer 2 switchserves at least one of the differing segments. The communication device-includes a discovery agentoperable, when a predetermined first event occurs, to obtain from the Layer 2 switchat least one of an access point identifier, a switch identifier from the Layer 2 switch, and a port identifier identifying the respective port-

Advanced port-based E911 strategy for IP telephony

To address the need to provide power control for listening participants of CDMA dispatch services, the concept of 'shared channel signaling windows' for shared traffic channels (e.g.,) is described. In one embodiment, the beginning of a signaling window is announced on the traffic channel and the remote units (e.g., MS) with the highest frame error rates compute the shortest transmit delays. For the duration of the window, remote units transmit their power control signaling according to their transmit delays. Thus, listening participants are given an opportunity, according to need, to perform power control signaling on the group traffic channel.

Method and apparatus for providing power control for CDMA dispatch services

In general, the present invention discloses a method and an apparatus that provide a dispatch patch service in a CDMA communication system (). A communication unit () involved in a dispatch call requests a base site () to patch a patch target (), either a dispatch group or an individual, into the present call. By providing the CDMA long-code mask being used for the present call to the patch target and the dispatch identifier of the patch target to at least the communication unit, a new CDMA long-code mask can be generated and used for the dispatch call going forward.

Method and apparatus for providing a dispatch patch service in a CDMA communication system

To address the need to provide listening participants of CDMA dispatch services soft handoff signaling capability, the concept of 'shared channel signaling windows' for shared traffic channels (e.g.,) is described. In one embodiment, the base site () announces the beginning of a signaling window for the traffic channel, allowing remote units (e.g., MS) that need to send handoff signaling an opportunity. In response to such signaling, the base site directs soft handoff information to the signaling remote units via the traffic channel. However, all the remote units that share the traffic channel can store this soft handoff information and later use the information to initiate soft handoffs without needing to exchange handoff messaging with the base site. Thus, a CDMA-dispatch, shared-channel implementation is enabled by providing soft handoff signaling windows and the over-the-air, soft-handoff messaging required for dispatch services is reduced.

Method and apparatus for CDMA soft handoff for dispatch group members

A CDMA base site provides dispatch group call service to members of a dispatch group by using a first long-code mask. The base site also repeatedly transmits the group call's channel assignment so that a scanning communication unit can detect that the call is active. In order for the scanning communication unit to decode the dispatch communication once the call is detected, it requests a long-code mask transition from the base site. The base site then transmits a new long-code mask and begins encoding the dispatch communication using the new mask. Thus, the scanning communication unit is able decode the communication and thereby join the active CDMA dispatch group call.

Method and apparatus for providing dispatch scan in a CDMA communication system

The present invention addresses the need for an apparatus and method for providing dispatch group and individual call services on a CDMA communication system. Generally, the present invention discloses modifications to the IS-95 CDMA standard such as substituting a dispatch identifier (e.g., ) for the Electronic Serial Number (ESN) used to generate CDMA long-code masks (e.g., ). In the present invention, transmitted voice information is encoded using a long-code mask thus derived. In addition, a dispatch identifier is used to determine ( and ) the appropriate paging resource for transmitting and receiving dispatch call pages.

Growing community of inventors

Algonquin, IL, United States of America

Rajendra A Panchal