Dynamic link adaption for time division duplex (TDD)
AssigneeInterDigital Technology Corporation
InventorsEldad Zeira, Stephen E. Terry, Ariela Zeira
Life of this patent
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Abstract
A TTD system implements dynamic link adaptation by adding or changing control information to notify the receiver which timeslots and codes are currently active and which timeslots should be avoided. The system synchronizes the transmitter and the receiver such that the receiver knows which timeslots and codes the transmitter has used to map the coded composite transport channel onto physical channels. The system attempts to avoid the timeslots which are experiencing transmission difficulties, while attempting to utilize the timeslots which are not experiencing transmission problems.
Claims18
A method for signaling code and timeslot assignments to support a communication of a user in a wireless hybrid time division multiple access (TDMA)/code division multiple access (CDMA) communication system comprising a first unit that communicates with at least a second unit, whereby the system supports wireless RF communications utilizing at least one timeslot from a plurality of timeslots and at least one code from a plurality of codes, the method comprising:
- at the first unit:
- calculating, for each available timeslot, the power required to transmit data;
- determining whether said calculated power for each timeslot exceeds a predetermined threshold and, if so, removing such exceeding timeslots from said available timeslots to determine remaining timeslots,
- signaling an identifier of said remaining timeslots to the receiver;
- and
- at the second unit:
- receiving the signaled identifier;
- and
- using said timeslots and the codes within the timeslots to support the communication.
A method for implementing dynamic link adaption in a time division duplex (TDD) communication system by transmitting timeslot and code allocation information in a data burst, the data burst having a plurality of fields including two data fields separated by a midamble field, the method comprising:
- transmitting, in at least one of said fields, an indication of timeslots to be used;
- allocating codes to said used timeslots in consecutive order until all codes have been assigned.
A method for signaling code and timeslot assignments to support a communication of a user in a wireless hybrid time division multiple access (TDMA)/code division multiple access (CDMA) communication system comprising a first unit that communicates with at least a second unit, whereby the system supports wireless RF communications utilizing at least one timeslot from a plurality of available timeslots and at least one code from a plurality of codes, the method comprising:
- at the first unit:
- calculating, for each available timeslot, the power required to transmit data;
- determining whether said calculated power for each timeslot exceeds a predetermined threshold;
- loading information to support said user communication in a first set of timeslots that do not exceed said predetermined threshold;
- and
- loading an encoded bit pattern in a second set of timeslots that exceed said predetermined threshold;
- signaling said first and second sets of timeslots to said receiver;
- and
- at the second unit:
- receiving the signaled timeslots;
- and
- using said information from said first set of timeslots to support the communication.
A time division duplex (TDD) communication system which supports user communications between a first unit and a second unit by transmitting a plurality of timeslots, each timeslot capable of supporting at least one code, whereby timeslot and code allocation information is communicated using a plurality of data bursts, each data burst having a plurality of fields including two data fields separated by a midamble field, the system comprising:
- means for determining the amount of interference within each timeslot;
- means for prioritizing the timeslots based upon the amount of interference, with timeslots having the least amount of interference having the highest priority;
- and
- means for allocating codes to timeslots in accordance with said priority, whereby timeslots with the highest priority are allocated first, said means for allocating consecutively allocating codes within each timeslot.
A method for signaling code and timeslot assignments in a time division duplex communication system comprising a first unit that communicates with at least a second unit, utilizing at least one timeslot from a plurality of available timeslots and at least one code for each timeslot from a plurality of codes for each timeslot, the method comprising:
- at the first unit:
- calculating the power required to transmit data for each available timeslot;
- determining whether said calculated power exceeds a predetermined threshold and, if so, removing such timeslots from said available timeslots to determine remaining timeslots,
- signaling an identifier of said remaining timeslots;
- and
- at the receiver:
- receiving the signaled identifier;
- and
- using said remaining timeslots to support the communication.
A method for implementing dynamic link adaption in a time division duplex communication system by transmitting timeslot and code allocation information in a data burst, the data burst having a plurality of fields including two data fields separated by a midamble field, the method comprising:
- determining inactive timeslots and active timeslots;
- transmitting, in at least one of said fields, an indication of active timeslots;
- consecutively allocating codes to active timeslots until all codes have been allocated.
Dependencies are inferred from the claim text.