Abstract:
A method for communication between a number of participants in a region, the number of participants being unlimited, the method comprising the steps: (a) allocating a unique identity to each participant; (b) allocating an order of priority for transmission by the participants based on an order of the unique identities; and (c) in each transmission of each participant there is included: (i) the unique identity of the participant; and (ii) a list of unique identities of all participants in the region.
Abstract:
The invention herein described relates to a system and method for efficiently using bandwidth across a fixed wireless or wired interface, which may be a broadband wireless access interface. A preferred embodiment of the invention dynamically assigns bandwidth for one or more DSO voice channels across a wireless interface in a configurable multi-channel communication system using T1 and/or E1 (310) trunks or any other multiplex source. Bandwidth for voice channels is assigned as a function of the ACTIVE/IDLE bits associated with the DSO channels and only those voice channels that are ACTIVE are assigned bandwidth. The invention describes a system and method for the dynamic allocation or removal of bandwidth for a channel as the state of the channel changes between ACTIVE and IDLE. Channels carrying data only are not impacted by the present invention.
Abstract:
A method for allocating and resizing a link on a communication medium is provided. The utilization of an allocated link is monitored and an unused bandwidth thereof is determined. Upon request for allocation of a second link, at least a portion of the unused bandwidth is included in the bandwidth of the second link allocated. A network including two nodes and a communication medium terminated thereby is operable to provide a plurality of communication links and is operable to resize the bandwidth of the allocated links is provided. The network is operable to monitor the utilization of an allocated bandwidth of an allocated link and deallocate a part of the allocated bandwidth that is non-utilized by the allocated link. The deallocated bandwidth, or a portion thereof, may then be included in a bandwidth allocation made for allocation of an additional link.
Abstract:
A method for operating a wireless communications system includes a step of signalling, between a mobile station to a network, that the mobile station or the network is temporarily ceasing transmission of circuit switched information (DTX), which could be voice frames or data frames. For the case of voice, the method further includes a step, executed in the network, of determining if a current uplink or downlink voice traffic channel that is assigned to the mobile station can be retained by the mobile station, or whether the current uplink or downlink voice traffic channel must be released by the mobile station. Only if it is determined that the current uplink or downlink voice traffic channel must be released by the mobile station, does the network signal to the mobile station to release the channel. The step of determining preferably considers a current network requirement for uplink voice traffic channels, and the step of signalling that the mobile station or the network is temporarily ceasing transmission of voice frames occurs in response to the mobile station or the network entering a Discontinuous Transmission (DTX) state. The retained channel may be later released during the DTX period, if the network determines that the channel is required to support another mobile station.
Abstract:
A voice-detecting device is provided to precisely discriminate between voiced and unvoiced intervals adaptively to various features of possible noises superimposed on a voice signal. The voice detection device comprises interval estimate means (11) for determining the probability that each of the time series voice frames belongs to a voiced interval according to a statistical technique; quality monitor means (12) for monitoring the quality of the voice signal of each voice frame; and interval determination means (13) for weighting the resulting probability based on the signal quality to determine the confidence of a voice interval.
Abstract:
A radio communication system has a random access channel for the transmission of data (214) from a secondary station to a primary station. Such a channel is intended for use by secondary stations having data (214) to transmit to a primary station while not actually engaged in a call. A problem with known systems of this type is that a secondary station requesting access also specifies which of a plurality of resources it wishes to access. If that resource is busy access is denied, even if other suitable channels are available. In the present system allocation of a channel is performed by the primary station when acknowledging (206, 210) a secondary station's access attempt (202, 208), thereby eliminating wasted attempts. In one embodiment the primary station also periodically broadcasts a short message indicating the availability of channels for access attempts.
Abstract:
In a point-to-multipoint link traffic is transmitted in packets across the shared medium. Access to the medium is controlled by permits sent by a central node to multipoint nodes in response to a queue record of the number of packets awaiting transmission at the multipoint nodes. When circuit emulated traffic, or traffic with tight delay and delay variation requirements, is to be sent across the link, permits are sent by the central node unsolicited at regular intervals in accordance with information stored in a scheduler. The scheduler may be a single or several circular memories comprising cells representing time slots on the link. The cells contain scheduling information corresponding to one or more multipoint nodes. The central node consults the scheduler to determine if a permit is scheduled. If no permit is scheduled the time slot may be allocated to an unscheduled service on the basis of a queue record.
Abstract:
Techniques for discontinuous transmission (DTX) and fast in-band signaling of configuration changes and protocol messages in speech communications systems provide cost efficiency in terms of radio transmission capacity, in terms of fixed line transmission, and in terms of implementation effort. An exemplary method for performing discontinuous transmission (DTX) in a communications system in which source data is interleaved for transmission from a first component in the system to a second component in the system includes the steps of detecting periods of source data inactivity, and transmitting silence descriptor (SID) frames from the first to the second component during the periods of source data inactivity, certain of the transmitted SID frames being interleaved using a different interleaving algorithm as compared to that used for source data. For example, the source data can be block diagonally interleaved, and certain of the SID frames can be block interleaved. An exemplary method for effecting configuration changes in a communications system includes the step of transmitting an escape frame in place of a speech data frame, the escape frame including a gross bit pattern to distinguish the escape frame from speech data frames and conveying a configuration change indication. The escape frame can further include a data field to indicate a particular configuration change to be made. For example, where the communications system is an AMR system, an escape frame can be used to change an active codec mode set. Alternatively, an escape frame can be used to change a phase of codec information.
Abstract:
A computer network includes frame or packet-based subnetworks connected by switches (S10, S11, S20 and S21), the switches being interconnected by high capacity trunks (T10, T11, T20 and T21) using a connection based data transfer protocol similar to Asynchronous Transfer Mode (ATM). Some of the trunks include a Permanent Virtual Path (PVP) trunk crossing an ATM core network (10), the PVP trunk including one or more bidirectional PVPs. A multipoint-to-point (MPT) protocol is used among the switches to transfer packets as groups of cells directly from "leaf", or source, switches to "root", or destination, switches without required significant routing-related processing during cell transmission. The switches allocate virtual path identifiers in a conserving manner such that (i) MPT paths from multiple leaf switches are merged to one path with a single virtual path identifier terminating at a root switch; (ii) on the PVP trunks, a virtual path identifier already allocated for an outgoing connection is allocated to an incoming connection ahead of any virtual path identifiers that are completely unallocated; and (iii) a range of virtual path identifiers is pre-provisioned at the core network access points, so that a switch connected to an access point allocates virtual path identifiers from the pre-provisioned range on behalf of upstream switches to extend MPTs across the core network.
Abstract:
A system, device, and method for scheduling data transmission opportunities for variable bit rate traffic provides data transmission opportunities at a peak cell rate when the end user is actively transmitting data, and provides data transmission opportunities at a lower rate when the end user has no data to transmit. When the end user has no data to transmit, any excess data transmission opportunities (i.e., data transmission opportunities from the lower rate up to the peak cell rate) are available for statistically multiplexing traffic from other end users. Various embodiments utilize a lower rate anywhere between a zero rate and a sustainable cell rate, inclusive. Alternative embodiments allocate a burst of data transmission opportunities equivalent to a maximum burst size at the peak cell rate when the end user has data to transmit, after which the end user is once again provided data transmission opportunities at the lower rate.