Abstract:
A method and apparatus whereby a communication unit (10) transmits a communication channel request and the nearest base site (12) makes the communication channel grant or allocation. A base site receives the channel request signal, measures the received signal strength (RSSI) level of the received signal, and if that level is above a threshold level, a communication channel is allocated to the requesting communication unit, thus establishing a communication link. If the channel request signal does not have an RSSI level above the threshold, the base site delays the grant of a communication channel for a period inversely proportional to the measured RSSI level to allow other base sites the opportunity to grant a communication channel to the requesting communication unit. If the base site determines that another base site has granted a communication channel to the requesting communication unit, the allocation process is stopped, and the base site continues scanning for channel request signals.
Abstract:
A method and apparatus is used for transmitting an outbound message in a two-way messaging system having a plurality of cells employing frequency reuse. The outbound message is transmitted to a selective call transceiver (122) utilizing a first frequency reuse plan (312). The two-way messaging system awaits a positive acknowledgment (316, 318) from the selective call transceiver (122) confirming that the outbound message was received with an acceptable quality. The two-way messaging system retransmits the outbound message to the selective call transceiver (122) utilizing a second frequency reuse plan (332), in response to receiving a negative acknowledgment and also in response to failing to receive any acknowledgment within a predetermined time after transmitting the outbound message.
Abstract:
A communication system (100) is designed that reduces co-channel interference when heterogeneous users (101-104) are sharing spectrum. The system design enables a plurality of pairs of users to communicate their channel utilization time periods by using the durations and start or stop times of certain transmissions to signal the start times and durations of later transmissions. Other system users using possibly different communications protocols and different modulation technologies can measure the durations of received transmissions and to infer channel usage based on these durations.
Abstract:
A two-way communication system is used for performing dynamic channel control. The two-way communication system comprises a base transceiver (102) and a plurality of selective call transceivers (122). The base transceiver (102) includes a plurality of base stations (116) controlled by a controller (112). The base transceiver (102) transmits query signals to the selective call transceivers (122) to prompt communication. The selective call transceivers (122) measure the signal quality of signals transmitted by the two-way communication system and transmit in return signal quality measurement data to the base transceiver (102) for analysis. The base transceiver (102) dynamically adjusts the signal quality of signals to be received by the selective call transceivers (122) in order to substantially reduce the noise interference that the selective call transceivers (122) experience.
Abstract:
A method and apparatus is used for transmitting an outbound message in a two-way messaging system having a plurality of cells employing frequency reuse. The outbound message is transmitted to a selective call transceiver (122) utilizing a first frequency reuse plan (312). The two-way messaging system awaits a positive acknowledgment (316, 318) from the selective call transceiver (122) confirming that the outbound message was received with an acceptable quality. The two-way messaging system retransmits the outbound message to the selective call transceiver (122) utilizing a second frequency reuse plan (332), in response to receiving a negative acknowledgment and also in response to failing to receive any acknowledgment within a predetermined time after transmitting the outbound message.
Abstract:
A digital radio communication system (10) includes a plurality of cells (11-28) for providing two-way digital radio communication. Each of the cells (11-28) utilizes communication frames (Figs. 3A-3E) having at least one inbound communication slot and at least one outbound communication slot. The frames of each cell are of uniform length. At least some of the cells (11-28) have different bit rates than other cells. Information about the contiguous cells is provided to the radios (40) operating within a cell. The radio (40) includes a memory (55) for storing information on adjacent cells and the radio can evaluate the signal of adjacent cells for determining an appropriate cell for hand-off purposes.
Abstract:
A method and apparatus is provided for assigning transmission slots in a time division duplex system. A time frame overlap determination processor (608) determines (314), based upon consistent observations for a sequence of time periods (220, 222, 224, 226, 228, 230) of a transmitter's time division duplex time frame (210, 212) used by a first transmitter (102), a plurality of timeslots (242) that are likely to experience interference at a first receiver (106) from an adjacent transmitter (108), the adjacent transmitter (108) having a second time division duplex time frame (212) with a definition that is equivalent to the transmitter's time division duplex time frame. A timeslot assignment processor (610) assigns (406, 410, 412), based upon the determining, at least one data packet transmission addressed to the first receiver (106) to a timeslot that is not within the plurality of timeslots of the time frame overlap (202).
Abstract:
Remote units within a first communication system (121) utilizes frequencies (channels) from a second communication system (120) when placing a call. When a first remote unit (106) wants to call a second remote unit (107) using the channels, the first remote unit sends a base station (103) a list of top N traffic channel blocks from the second communication system along with the identity of the second remote unit. The base station then pages the second remote unit using a signaling channel reserved by second system. The second remote unit responds to the page with its list of best traffic channel blocks/chunks. The base station then picks the best overlap of idle channels from the list received by the remote units, and sends the list to the remote units instructing them use those traffic channels. Once the remote units receive the available channels, they can begin their call.
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 system (100) and method (400) for mesh/ad hoc participation is provided. The method 400 can include compensating a first service provider (510) for allowing a device (539) of a second service provider (530) to operate in an ad hoc network (500) operated by the first service provider, and determining network resources utilized for providing communication among nodes in the ad hoc network. The compensation to the first service provider accounts for network resources utilized by the device for communicating within the ad hoc network. Resources can include equipment that is operated, owned, leased, rented, borrowed, or shared by the service provider. The method 400 allows users to roam to other networks without a service subscription agreement.