Abstract:
A time division multiplexed system (100) is disclosed in which communication messages among a wide area site (W) and a plurality of substantially scattered local sites (L1-L6) are communicated on a radio frequency channel which is divided into a plurality of time slots (550), wherein at least one of the time slots is further divided into a plurality of sub slots (510-540). Communication units (103) operating in the wide area site (W) communicate communication messages during the time slots, and the communication units (103) operating in the local sites (L1-L6) communicate communication messages during the sub-slots which are assigned to each of the local sites.
Abstract:
A communication system that provides TDM and FDM communications between communication units. At least two control slots are provided in each TDM frame window to provide communication control information such as channel assignment information.
Abstract:
When data is ready for transmission, a quality measurement of a communication resource is determined (303). A preferred signalling technique is determined from a plurality of signalling techniques (305). A reservation request for allocation of the communication resource is transmitted, including in the reservation request the preferred signalling technique (307). A reservation grant is transmitted according to the preferred signalling technique (309).
Abstract:
A method of providing a communication unit (10) access to a shared communication resource. In the communication unit, a clock (123) is maintained, and the unit detects the time when an inhibit period on the shared communication resource begins, and the time at which it concludes. When access to the shared communication resource is desired, the unit attempts to access the communication resource based on the time at which access was desired, as well as the times at which a detected inhibit condition began and concluded. A virtual time clock runs only during non-inhibit periods. Access to the communication resource is then based on when the virtual time clock equals the desired access time.
Abstract:
A method of providing a radio communication unit (120) with information regarding radio communication services. The radio communication unit transmits a request regarding availability of one or more specific radio communication services. The radio communication unit then receives information regarding availability of the specified radio communication services.
Abstract:
A communication resource is subdivided as a function of time into a plurality of time slots (210), which may then be further subdivided on a non-periodic basis into a number of sub-slots (220). In a slot or sub-slot, communication units (101) may utilize the communication resource according to a specific set of access methods defined for that slot or sub-slot. In one embodiment the time slots are subdivided on a non-periodic basis into a least two random access sub-slots, during which communication units may either request one or more reserved time slots, or send unreserved data packets (240). In response to requests for reserved time slots from a requesting communication unit, one or more reserved time slots are provided for the use of the requesting communication unit.
Abstract:
A time division multiplexed system is disclosed in which communication messages among a wide area site and a plurality of substantially scattered local sites are communicated on a radio frequency channel which is divided into a plurality of time slots, wherein at least one of the time slots is further divided into a plurality of subslots. Communication units operating in the wide area site communicate communication messages during the time slots, and the communication units operating in the local sites communicate communication messages during the subslots which are assigned to each of the local sites.
Abstract:
MULTIPLE CONTROL SLOT TDM/FDM COMMUNICATION SYSTEM A communication system that provides TDM and FDM communications between communication units. At least two control slots are provided in each TDM frame window to provide communication control information such as channel assignment information.
Abstract:
A time division multiplexed system is disclosed in which communication messages among a wide area site and a plurality of substantially scattered local sites are communicated on a radio frequency channel which is divided into a plurality of time slots, wherein at least one of the time slots is further divided into a plurality of subslots. Communication units operating in the wide area site communicate communication messages during the time slots, and the communication units operating in the local sites communicate communication messages during the subslots which are assigned to each of the local sites.