Abstract:
In a method of transmitting a digital data message in predetermined time slots within fixed length time intervals, data in a frame according to a first format is processed for transmission in a frame according to a second format. The formats are in accordance with different data link control protocols. Upon reception, the frame according to the first format is retrieved.
Abstract:
In time domain multiplex/time domain multiple access communications between a base station and subscriber unit, the base station sends a timing reference signal. A subscriber unit responds with a data packet (a) sufficiently short to ensure correct reception by the base irrespective of transmission time. The base determines the transmission time taken and instructs the subscriber unit to advance its timings so that longer data packets (b) can be sent so as to be received when expected. The timing adjustment includes both a fixed present component dependent on approximate separation of base station and subscriber unit, and a second component from measurement of the transmission time taken.
Abstract:
Subscriber units which communicate with a base station in predetermined time slots within fixed length time frames are grouped into classes of subscriber units. At least one selected class is restricted from transmitting certain types of messages so as to ease system loading when many subscribers are trying to make calls.
Abstract:
In a communication between a base station and subscriber unit in time slots within fixed length time frames, different types of messages require different numbers of time slots per frame to maintain transmission rate. At least a portion of the message is detected to determine the type of message, and if appropriate, additional time slot(s) are assigned.
Abstract:
Switching a call sent in time slots within fixed length time frames from a first channel having an associated time slot to a second channel having an associated time slot in the frame involves transmitting in both slots for at least one frame. When correctly received in the second time slot, the first time slot can be released.
Abstract:
In a communications network involving transmission of data packets, control messages between are assigned priorities dependent on message type. The allocated of messages to TDM/TDMA time slots is dependent on the assignment priorities.
Abstract:
In transmission between a base station and a subscriber unit, system control signals are sent in time slots within fixed length time frames. The system control signals are fragmented, each fragment being sent in a different time slot of a frame.
Abstract:
In apparatus and a method of transmitting messages in predetermined time slots within fixed length time frames in which the power level of a message received at a receiver is detected. If the power level falls outside one of a series of ranges around a predetermined target power level, then the power level of the next message to be transmitted is adjusted so that the power level of the next message falls within the range. Steps of detection and possible-adjustment are repeated with increasingly fine target ranges of power levels being applied.