Abstract:
Channels are assigned to a plurality of transmitters (206) in a radio communication system. First, interference constraints are defined (402) for the plurality of transmitters, and channel capacity required to handle traffic for each of the plurality of transmitters is measured (404). Then a mathematical programming technique is applied (406) to minimize the total number of channels assigned in the system, consistent with the interference constraints and the channel capacity required. The programming technique is selected from an integer programming technique (414) and a linear programming technique (408).
Abstract:
A communication system, including base transmitters (113) and base receivers (115) for transmitting and receiving messages to and from selective call transceivers (116), is used for selecting an optimal base transmitter (113) for transmitting messages to a selective call transceiver (116) that cannot identify its location within the communication system. The communication system selects an optimal base transmitter (113) having a highest of a plurality of probabilities for successfully transmitting a selective call message to the selective call transceiver (116) as a function of overlap between transmission coverage areas of the plurality of base transmitters (113) and a reception coverage area of the at least one base receiver (115) that received a negative acknowledge message from the selective call transceiver (116). After selecting the optimal base transmitter (113), the communication system causes the optimal base transmitter (113) to transmit the selective call message to the selective call transceiver (116).
Abstract:
A method and apparatus is used for transmitting an outbound message (408) in a two-way messaging system having a plurality of cells employing frequency reuse. The controller (112) of the two-way messaging system divides ones of the plurality of cells into a plurality of rings based on radio frequency propagation and interference environment. The controller (112) then sends to a portable selective call transceiver (122) a notification of the outbound message (408). In response, the controller (112) receives information sufficient to determine an identity of one of the plurality of rings in which the portable selective call transceiver (122) has determined itself to be located, and transmits the outbound message (408) to the portable selective call transceiver (122), utilizing a frequency reuse plan in accordance with the identity.