Abstract: A battery saving interval utilized for communicating with a portable subscriber unit (122) in a radio communication system is dynamically adjusted. An occurrence of a predetermined triggering event associated with the portable subscriber unit is observed (504), and the battery saving interval utilized for communicating with the portable subscriber unit is adjusted (506) in response to the predetermined triggering event, while battery saving intervals of other portable subscriber units in the system are left unchanged.

Abstract: A method and apparatus synchronize a first floating timing reference (207) of a first base station (116) with a timing reference of a second base station (116) of a communication system, without requiring an interruption of normal user traffic through the communication system. A receiver (208) of the first base station monitors (402) a user traffic transmission of the second base station, thereby generating a received signal, and a processing system (206) of the first base station derives (410) a received timing reference (308) from the received signal. The processing system independently adjusts (426, 428) the first floating timing reference according to the received timing reference, without requiring a timing adjustment instruction from a centralized synchronization controller.

Abstract: A base station (214) synchronizes a data stream of a second transmitter (202) with that of a first transmitter while maintaining full user traffic through a radio communication system (200). The first and second transmitters transmit (501), during a first time interval, a first portion of the user traffic in a simulcast mode; and at least the first transmitter transmits (503), during a second time interval, a second portion of the user traffic in a non-simulcast mode. A receiver (204) proximate the second transmitter monitors (505) the second portion of the user traffic transmitted from the first transmitter to determine a time delay, and then adjusts (507) a launch time of the second transmitter in accordance with the time delay.

Abstract: A controller (112) controls (706) at least two transmitters (302) to transmit at least two simulcast signals (502, 504) during a time period. The at least two simulcast signals produce intersymbol interference at a receiver. At least one of the transmitters changes (708) its output amplitude during a portion of the time period, thereby altering the intersymbol interference during the portion of the time period.

Abstract: A device (124, 122) having application data to transmit collects (502) information concerning data transport capabilities affecting transmission timing of at least one wireless link available for transmitting the application data, and calculates (506), from the information, a maximum amount of data that can be completed through the at least one wireless link by a predetermined time. The device then determines (508), when attainable, from the application data and from a predetermined set of user-presentation formats possible for the application data, a user-presentation format that requires less than the maximum amount of data. The device then formats (514) the application data in accordance with the user-presentation format before transmitting the application data (530).

Abstract: In a messaging system having a plurality of simulcasting base transmitters (104), a plurality of pseudorandom sequence generators (216) are provided (402) for the plurality of base transmitters. The plurality of pseudorandom sequence generators are arranged (403) to ensure that they generate a plurality of pseudorandom sequences having sub-sequences that are different from one another during concurrent transmissions by the plurality of base transmitters. A cancellation-affecting parameter of the plurality of base transmitters is adjusted (404, 406, 408) in accordance with the plurality of pseudorandom sequences during the simulcast transmission from the plurality of base transmitters to limit intervals of carrier cancellation.

Abstract: A radio communication system (100) synchronizes multiple data streams associated with a network of transmitters (102) while maintaining full user traffic. The transmitters transmit (901) a first portion of the user traffic in a simulcast mode during a first time interval, (104) and transmit (903) a second portion of the user traffic in a non-simulcast mode during a second time interval. A monitor receiver (104) is coupled to the transmitters by radio signals for monitoring (905) the second portion of the user traffic transmitted from selected transmitters to determine transmission delays. A controller (108) is coupled to the monitor receiver for adjusting (907) the data streams to equalize the transmission delays (303).

Abstract: A radio frequency manager (12) for choosing a selective call protocol among a plurality of selective call protocols comprises a memory (13) for storing historical data on messages previously sent, the historical data comprising for each protocol an airtime efficiency rating, a latency measurement, and a message queue profile and another memory (15) for storing pending messages, each of the pending messages having current information comprising at least an associated priority, synchronization requirement, and an allowable transmission time for sending the pending messages.

Abstract: A method and apparatus assigns and utilizes sets of transmitters (206) to provide radio coverage in dynamically assigned simulcast areas for communicating simultaneously with portable transceivers (122). Transmitters are assigned (704) to the sets such that each set is assigned all transmitters dominant to at least one of the portable transceivers having a message queued therefor. A transmitter is defined to be dominant when it can affect communications with the at least one of the portable transceivers while different data transmissions are being sent from all other transmitters. A subset of the sets is determined (708), wherein no transmitter is assigned more than once in the subset. The sets of the subset are then simulcast (710) such that the transmitters assigned to each of the sets of the subset transmit the message queued for the at least one of the portable transceivers to which the transmitters of the set are dominant.