Genband US LLC

Telefonaktiebolaget Lm Ericsson (publ)

Nortel Networks Corporation

Northern Telecom Limited

Kapsch Carriercom France S.a.s.

Apple Inc.

Chung Cheung Chu

Rafi Rabipour

Djordje Konforti

Paul Boudreaux

Paul Vincent Coverdale

Daniel Cohn

William Navarro

Pierre Gendron

Christy Yep

A multi-process scheduler applies a joint optimization criterion to jointly schedule multiple processes executed on a shared processor. The scheduler determines, for each one of a plurality of processes having a predetermined processing time, at least one of an expected arrival time for input data and required delivery time for output data. The scheduler jointly determines process activation times for the processes based on said arrival/delivery, and the processing times, to meet a predetermined joint optimization criterion for the processes. The processes are scheduled on the shared processor according to the jointly determined activation times to minimize queuing delay.

Joint scheduling of multiple processes on a shared processor

Communication apparatus having interfaces for exchanging data with first and second neighbors, a memory for storing codec information regarding the communication apparatus and a control entity operative to detect a message from the first neighbor, the first message being indicative of codec information regarding an originating entity. In response, the control entity assesses compatibility between the codec information regarding the originating entity and the codec information regarding the communication apparatus. If the assessment is positive, the control entity self-identifies the communication apparatus as a candidate for terminally supporting a subsequent codec-bypass negotiation with the originating entity. If the assessment is negative, the control entity self-identifies the communication apparatus as a candidate for non-terminally supporting such negotiation. The invention thus capitalizes on the realization that although an end-to-end codec-bypass connection may not be possible, it may nevertheless be possible to achieve bandwidth savings by establishing a codec-bypass connection along only a portion of the path.

Data communication apparatus and method

A switch that interconnects networks provides a scheduling algorithm that determines a number of active events to be processed by a processor in the switch. The active events involve processing of bearer traffic. A schedule tailored to the number of active events is generated. In response to a change affecting the schedule, the schedule is modified. The active events are processed by the processor according to the modified schedule.

Providing a schedule for active events to be processed by a processor

A data communication apparatus, comprising an interface for enabling communication with a remote entity via a network and a control entity in communication with said interface. The control entity is operative to establish a packet-switched connection with the remote entity through the network and to negotiate with the remote entity using in-band signaling entry into a codec-bypass mode of operation. In this way, a codec-bypass connection, which enhances speech quality, can be established over a packet network, which reduces bandwidth.

Methods and apparatus for data communication

In a communications network having plural nodes, a first node receives a capability list that has a predefined format and includes plural entries identifying corresponding data processing functions supported by one or more nodes along a communications path of a communications session involving the first node. The first node adds at least one additional entry into the capability list in response to determining that the first node supports a data processing function that is not identified in the capability list.

Providing a capability list of a predefined format in a communications network

A network entity, which comprises an input configured to receive from an upstream network entity a stream of first media data elements; an output configured to release towards a downstream network entity a stream of second media data elements; a processing engine configured to effect processing tasks on the first media data elements, thereby to generate the second media data elements, the processing tasks being effected in a set of processing intervals; and a control entity. The control entity is configured for receiving a request for a first phase adjustment from the downstream network entity; modifying the set of processing intervals in which are effected the processing tasks in an attempt to accommodate the first phase adjustment; determining a second phase adjustment based on arrival characteristics of the first media data elements and the modified set of processing intervals; and releasing towards the upstream network entity a request for the second phase adjustment.

Method and apparatus for time alignment along a multi-node communication link

A method and apparatus for controlling an operative setting of a communications link is provided. The communications link is capable of acquiring a plurality of operative settings. Audio quality in the communications link under different operative settings is compared and an operative setting is selected at least in part on the basis of this comparison. A control signal is sent to at least one component in the communications link to cause the communications link to attempt to acquire the selected setting.

Method and apparatus for controlling an operative setting of a communications link

In methods and apparatus for distinguishing stationary signals from non-stationary signals, a set of Linear Predictive Coding (LPC) coefficients characterizing spectral properties of the signal for each of a plurality of successive time intervals, including a current time interval, is determined. The LPC coefficients are averaged over a plurality of successive time intervals preceding the current time interval, and a cross-correlation of the LPC coefficients for the current time interval with the averaged LPC coefficients is determined. The signal is declared to be stationary in the current time interval when the cross-correlation exceeds a threshold value, and is declared to be non-stationary in the current time interval when the cross-correlation is less than the threshold value. The methods and apparatus are particularly applicable to detection of transitions between an absence of speech state, characterized by a stationary signal, and a presence-of-speech state characterized by a non-stationary signal.

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Brossard, Canada

Chung Cheung Chu