Abstract: A method for terminating a communication session is present. During a communication session in which communication devices are in communication through a server, one of the devices decides to terminate the session. This device generates a first message requesting permission to terminate participation in the session and sends it to the server. The server, receiving the first message, determines whether or not there is session media being communicated or pending communication to the device. If not, the server generates a second message authorizing the device to terminate its participation in the session and sends it to the device. The device continues to listen for session media until, upon receiving the second message, it terminates its participation in the session.

Abstract: A wireless broadband communication system that operates with high efficiency and reduced latency in long range point-to-point and point-to-multipoint applications. The system includes multiple transceivers and multiple antennas for transmitting and receiving wireless signals using TDD techniques over multiple channels, which include a control channel for setting both the size of the transmit bursts and the modulation threshold level. By determining the size of the transmit bursts for a subsequent data transmission based upon the number of filler packets detected in a specified number of previously received bursts, and adjusting the modulation threshold level for the subsequent transmission based upon the transmit burst size, the system provides increased data throughput, while maintaining the packet error rate at an acceptable level. As the throughput requirements of the system are relaxed, the modulation threshold levels can be adjusted to provide reduced packet error rates.

Abstract: A communication system and a method of communicating data. A first backhaul site can be dynamically selected from a plurality of backhaul sites that are each configured to wirelessly communicate with an access point. A controller can dynamically configure a transmission parameter used to communicate a first backhaul data stream between the access point and the first backhaul site. The first backhaul data stream can be derived from a source data stream and can be wirelessly communicated between the access point and the first backhaul site. A second backhaul site also can be selected. A second backhaul data stream also can be derived from the source data stream and wirelessly communicated between the access point and the second backhaul site. The first and second backhaul data streams can be combined.

Abstract: Upon detecting (201) a communication need for a group of communication recipients that entails attempting to make at least one transmission to each of the communication recipients in the group (wherein at least one of the communication recipients has both a scheduled personal communication opportunity and a scheduled group communication opportunity), one automatically uses (202) whichever of the scheduled communication opportunities occurs first to make the at least one transmission to the communication recipient(s) for which this option applies. In one approach this response is further informed and influenced by one or more other factors, such as but not limited to system loading (203), group size and/or known whereabouts (204), and/or whether a recent transmission response was received (205).

Abstract: A method and apparatus for preventing false alarm activation is provided. According to one embodiment of the invention, a determination (410) is made as to whether an instruction from a controller is a commanded reset, and control of a Subscriber Line Interface Circuit is taken (416) from a voice processor circuit when the instruction is a commanded reset.

Abstract: A wireless broadband communications system that provides higher performance and increased spectral efficiency in point-to-point and point-to-multipoint applications. The wireless communications system includes a plurality of transceivers and a plurality of transmit and receive antennas. The system can be configured as a 1:n SIMO system that transmits and receives signals over a single channel of information flow, or an n:n MIMO system that transmits and receives signals over multiple channels of information flow, based upon channel state information and average vector error measurement values corresponding to the respective channels of information flow, which are determined by the system via an adaptive modulation technique.

Abstract: The channel estimation technique employs a set of pilot tones to determine channel state information. Because some of the pilot tones contained in the OFDM symbols may be missing after transmission, the disclosed technique employs a set of known pilot tones to compute an estimate of the channel impulse response, which may exhibit a level of distortion. Non-zero terms of the estimated channel impulse response that fall outside of a prescribed time window are regarded as artifacts of a set of missing or unknown pilot tones. Information relating to the known pilot tones and the artifacts of the unknown pilot tones are employed for mathematically reconstructing and deriving values of the unknown tones. Then, the values of the known pilot tones and the derived values of the unknown pilot tones are employed to recompute the channel impulse response, thereby obtaining the channel estimate with a reduced level of distortion.

Abstract: The invention provides a method of retransmitting a speech packet. In one embodiment, the method includes receiving (S702) at a transmitting device (140) a first negative acknowledgement (NACK) from a receiving device (120). The NAK indicates a corrupted first speech packet transmission. The transmitting device then retrieves (S706) a first speech packet associated with the first NACK and compresses (S714-S720) the speech packet to form a replacement speech packet. Next, a current segment of speech is encoded (S808) to form a current speech packet and current speech packet is combined with the replacements speech packet. The combined speech packet is then transmitted (S814) to the receiving device.

Abstract: A wireless broadband communications system that can maintain high data rates while taking into account channel interference resulting from operating in shared frequency bands, signal fading resulting from dynamic channel degradation, and signal distortion resulting from compliance with maximum power output regulations. In one mode of operation, the system performs adaptive modulation by transmitting a first signal over a selected channel using a first modulation mode having a level of distortion associated therewith resulting from operating the system at a predetermined maximum power output level. Next, a SINAD level is measured on the first channel. The level of distortion associated with the first modulation mode is then subtracted from the measured SINAD level to obtain a first noise level.

Abstract: A method is provided for implementing a coding and adaptive modulation scheme for application to a point-to-point orthogonal frequency division multiplexed radio communications link. The method determines estimates of the likelihood of the two least significant bits of the digital representation of an input amplitude being a predetermined logical level. The likelihood estimates are input to a Forward Error Correction decoder, which produces a decision as to the state of the bits taking into account previous samples. Once the decision has been made, it is known what the ideal input amplitude would have been in the absence of noise and distortion, on the assumption that the decision was correct, and hence the contribution due to noise and distortion can be estimated. This knowledge can be used to assist the decoding of the most significant bits.

Abstract: An ad hoc telecommunications network comprises a plurality of mobile devices, cached data being distributed amongst the devices. A manager device is elected for example based on highest compared received signal strength amongst the devices to manage the distributed data. The manager election can by dynamically up-dated to compensate for changes in the network parameter for example devices entering or leaving the network, or physical relocation of the devices within the network. In addition, the ad hoc network can communicate with a fixed infrastructure, the fixed infrastructure maintaining a table identifying a gateway device for direct communication with the fixed infrastructure, allowing communication with a mobile device within the ad hoc network. Yet further the ad hoc network can provide a communications route between two remote fixed infrastructures.

Abstract: In the present technique for transmitting and delaying radio frequency signal transmission, an RF delay filter (102) is provided with at least one high permittivity material coaxial delay element (104) with each having an input port (114) and an output port (116). Multiple coaxial delay elements are operably coupled by a quarter-wave microstrip transmission line (230) to offset any frequency mismatch at the band edges of the delay elements. A series of capacitors (126, 128) are also included at each port of the coaxial elements to compensate for any resultant parasitic inductance.

Abstract: Media access control in known communications systems relies upon an initial position of a mobile terminal and one or more Quality of Service parameters. In order to improve the quality of allocation of resources, the present invention provides a communications system and a method therefor for allocating resources in response to the mobile terminal (110) following a predicted path (113) to an optimum location (116) where the radio environment is better than the radio environment at the initial location (112).

Abstract: Apparatus and method for performing radio environment reporting on a reverse common signaling channel. When a dedicated RF connection between a remote unit (RU) (118) and infrastructure equipment (109) is being released, the RU receives a first message from the infrastructure instructing the RU to perform occasional pilot strength reporting on the reverse common signaling channel (r-csch) while the RU is in the idle state. In the preferred embodiment, the pilot strength reporting is limited by a maximum number of reports and/or a time limit to preserve battery life and prevent r-csch congestion in the system. Preferably, a Radio Environment Report Message, referred to generally herein as a second message, carries radio environment information (REI), such as pilot strength and phase of the best pilots measured, and helps the infrastructure both with tracking the RU location and with selecting a strong set of pilots for channel assignment.

Abstract: A method of reducing access to communication system resources by a fraudulent Mobile Station (102). The Mobile Switching Center (104) sends a message to the Authentication Center (106) to invoke a first authentication procedure. The Authentication Center responds with a message including the results of the first procedure, and possibly, parameters for performance of an additional authentication procedure. Based on the contents of the message, the Mobile Switching Center decides whether to delay call setup until after the additional authentication procedure has completed successfully or whether to initiate call setup in parallel with the additional authentication procedure.

Abstract: A method for supporting rescue channels in a communications system. The rescue channel feature supports the use of pre-allocated radio resources at neighboring BSs 104, 106 in order to attempt to recover a voice call in danger of being dropped. The MS 114 disables its transmitter upon detection of a loss of forward frames from the network. Once the source BS 102 detects a loss of transmission from the MS 114, it may attempt to re-establish communication with the MS 114 by performing soft handoff additions to rescue cells at neighboring BSs. The neighboring BSs are the MS's neighbor list, last reported Extended Pilot Strength Measurement Message (EPSMM), and possibly other factors.

Abstract: This invention relates to a cellular communication system (200), billing processor (223) and method of billing. The communication system includes a subscriber unit (201) having a user updateable identity to phone number association table used for dialling phone numbers based on an identity such as a name. It also includes means (203, 205,219,217) for communicating the table to a billing processor (223) being part of the fixed network. The billing processor (223) comprises means (227) for receiving the table and generating a billing association table containing information from the identity to phone number association table. It furthermore comprises a billing report generator (225) for generating a billing report for the subscriber unit (201) including identity information derived from the billing association table. The invention is applicable to cellular communication systems such as UMTS.

Abstract: The invention provides methods and apparatus, including mobile stations to enable the mobile station to encode and/or decode messages, for example messages broadcast by the base station on a broadcast channel. The encoding and decoding is based on a set of rules downloaded to the mobile station into an area of application space or storage dedicated to this function.