Communications systems
AssigneeKYOCERA Corporation
InventorsSimon Armour, Angela Doufexi, Joseph Mc Geertvaw
Life of this patent
Estimating the term…
Abstract
In a multi user communication system, subcarriers are allocated to subchannels using a quality measurement for each subchannel. An initial sub carrier is allocated to each subchannel, and a quality metric measured. Subsequent subcarriers are allocated in dependence upon the quality measurement for each subchannel. The subchannel with the lowest quality measurement receives the first allocation, and the subchannel with the highest quality measurement receives the last allocation. The subsequent allocation is repeated, following a re-sort of the subchannel quality measurements, until all of the subcarriers are allocated.
Claims48
A method of allocating subcarriers to subchannels in a multi-user telecommunications system employing a plurality of subcarriers, the subchannels being allocated to at least one user, the method comprising:
- a) allocating an initial subcarrier to each of a plurality of subchannels;
- b) detecting a quality for each subchannel based on the allocated subcarrier;
- c) sorting the subchannels into ascending order of quality to produce an ordered list of subchannels;
- d) allocating a further subcarrier to each subchannel, in an order determined by the ordered list of subchannels;
- e) repeating steps c) and d) until all subcarriers are allocated.
A method of transmitting data from a base station to a terminal in a telecommunications system employing a plurality of subcarriers at respective subcarrier frequencies, the method comprising:
- allocating subcarriers to each of a plurality of subchannels;
- allocating at least one subchannel to each terminal;
- transmitting data from a base station to a terminal on the subchannel allocated to that terminal,
- wherein allocating subcarriers to each of a plurality of subchannels comprises the steps of:
- a) allocating an initial subcarrier to each of the plurality of subchannels;
- b) detecting a quality for each subchannel based on the allocated subcarrier;
- c) sorting the subchannels into ascending order of quality to produce an ordered list of subchannels;
- d) allocating a further subcarrier to each subchannel, in an order determined by the ordered list of subchannels;
- e) repeating steps c) and d) until all subcarriers are allocated.
A telecommunications system comprising:
- a base station operable to transmit signals to a plurality of terminals, the signals being transmitted on respective subchannels to which subcarriers are allocated;
- at least one terminal operable to -receive a subchannel communication from the base station;
- and
- an allocation unit operable to allocate subcarriers to subchannels, and to allocate subchannels to terminals, wherein the allocation unit is operable to:
- a) allocate an initial subcarrier to each of a plurality of subchannels;
- b) detect a quality for each subchannel based on the allocated subcarrier;
- c) sort the subchannels into ascending order of quality to produce an ordered list of subchannels;
- d) allocate a further subcarrier to each subchannel, in an order determined by the ordered list of subchannels;
- e) repeat steps c) and d) until all subcarriers are allocated,
A base station for a telecommunications system, the base station comprising:
- a transmitting unit operable to transmit the signals to a plurality of terminals, the signals being transmitted on respective subchannels to which subcarriers are allocated;
- an allocation unit operable to allocate subcarriers to subchannels, and to allocate subchannels to terminals, where the allocation unit is operable to:
- a) allocate an initial subcarrier to each of a plurality of subchannels;
- b) detect a quality for each subchannel based on the allocated subcarrier;
- c) sort the subchannels into ascending order of quality to produce an ordered list of subchannels;
- d) allocate a further subcarrier to each subchannel, in an order determined by the ordered list of subchannels;
- e) repeat steps c) and d) until all subcarriers are allocated.
A terminal for receiving a subchannel transmitted from a base station, the terminal comprising:
- a reception unit operable to receive a subchannel transmitted from a base station, the subchannel being allocated to the terminal;
- a detection unit operable to detect a quality for the subchannel allocated to the terminal;
- a transmission unit operable to transmit a detected quality to a base station;
- wherein the terminal receives the subchannel determined by the base station, which is operable to:
- a) allocate an initial subcarrier to each of a plurality of subchannels;
- b) detect the quality, which transmitted from the terminal, for each subchannel based on the allocated subcarrier;
- c) sort the subchannels into ascending order of quality to produce an ordered list of subchannels;
- d) allocate a further subcarrier to each subchannel, in an order determined by the ordered list of subchannels;
- e) repeat c) and d) until all subcarriers are allocated.
Dependencies are inferred from the claim text.