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US 2018/0123672 A1Published application
Efficient cqi signaling in multi-beam mimo systems
AssigneeKoninklijke Philips N.V.
InventorsMatthew Peter John BAKER, Timothy James MOULSLEY
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Abstract
The present invention relates to the signaling of channel quality information in a multi-beam transmission system, wherein a plurality of beams are simultaneously transmitted and a plurality of sets of channel quality information are transmitted for controlling independently the transmission rate on the different beams. Determined are beams with a different quality resulting in different effects of errors in the transmissions of the channel quality information for the beams. Said different effects are exploited for reducing a signaling overhead of the channel quality information for the beams.
Claims57
A method for signaling channel quality information (CQI) in a multi-beam transmission system wherein a plurality of beams are simultaneously transmitted and one or more sets of channel quality information (CQI) are transmitted for independently controlling a transmission rate on at least two beams of the plurality of beams, the method comprising:
- in a network element:
- determining a received signal-to-interference ratio (SIR) of the at least two beams of the plurality of beams;
- determining a first beam of the at least two beams of the plurality of beams to be a primary beam as a consequence of the determined signal-to-interference ratio (SIR) being not less than a received signal-to-interference ratio (SIR) of any other beam of the at least two beams of the plurality of beams;
- determining at least one other beam of the least two beams of the plurality of beams to be a secondary beam;
- and
- reducing a signaling overhead of a channel quality information (CQI) for the at least two beams of the plurality beams by providing different reporting rates for a channel quality information (CQI) for the primary beam and the secondary beam,
- wherein providing the different reporting rates for the channel quality information (CQI) comprises providing a second reporting rate for channel quality information (CQI) transmissions relating to the secondary beam compared to a first reporting rate for channel quality information (CQI) transmissions relating to the primary beam,
- wherein a differential signaling is used to indicate a channel quality information (CQI) value for the secondary beam, and
- wherein an absolute value of the channel quality information (CQI) is signaled for the primary beam, and channel quality information (CQI) values for the secondary beam are signaled as an offset relative to the absolute value for the primary beam.
6 more elements
A non-transitory computer-readable storage medium comprising any medium that is not a transitory propagating signal or wave, and having stored thereon instructions that when executed cause a processor of a network element in a multi-beam transmission system to:
- in a network element:
- determine a received signal-to-interference ratio (SIR) of at least two beams of a plurality of beams;
- determine a first beam of the at least two beams of the plurality of beams to be a primary beam as a consequence of the determined signal-to-interference ratio (SIR) being not less than a received signal-to-interference ratio (SIR) of any other beam of the at least two beams of the plurality of beams;
- determine at least one secondary beam of the least two beams of the plurality of beams;
- and
- reduce a signaling overhead of a channel quality information (CQI) for the at least two beams of the plurality beams by providing different reporting rates for the channel quality information (CQI) for the primary beam and the at least one secondary beam,
- wherein providing the different reporting rates for the channel quality information (CQI) comprises providing a second reporting rate for channel quality information (CQI) transmissions relating to the secondary beam compared to a first reporting rate for channel quality information (CQI) transmissions relating to the primary beam,
- wherein a differential signaling is used to indicate a channel quality information (CQI) value for the secondary beam, and
- wherein an absolute value of the channel quality information (CQI) is signaled for the primary beam, and channel quality information (CQI) values for the secondary beam are signaled as an offset relative to the absolute value for the primary beam.
6 more elements
A network element in a multi-beam transmission system, the network element comprising:
- a determining device for determining a received signal-to-interference ratio (SIR) of at least two beams of a plurality of beams in the multi-beam transmission system;
- the determining device for determining a first beam of the at least two beams of the plurality of beams to be a primary beam as a consequence of the determined signal-to-interference ratio (SIR) being not less than a received signal-to-interference ratio (SIR) of any other beam of the at least two beams of the plurality of beams;
- the determining device for determining at least one other beam of the least two beams of the plurality of beams to be a secondary beam;
- and
- a reducing device for reducing a signaling overhead of a channel quality information (CQI) for the at least two beams of the plurality of beams by providing different reporting rates for the channel quality information (CQI) for the primary beam and the secondary beam,
- wherein providing the different reporting rates for the channel quality information (CQI) comprises providing a second reporting rate for channel quality information (CQI) transmissions relating to the secondary beam compared to a first reporting rate for channel quality information (CQI) transmissions relating to the primary beam,
- wherein a differential signaling is used to indicate a channel quality information (CQI) value for the secondary beam, and
- wherein an absolute value of the channel quality information (CQI) is signaled for the primary beam, and channel quality information (CQI) values for the secondary beam are signaled as an offset relative to the absolute value for the primary beam.
5 more elements
A base station in a multi-beam transmission system, the base station comprising:
- a determining device for determining a received signal-to-interference ratio (SIR) of at least two beams of a plurality of beams in the multi-beam transmission system;
- the determining device for determining a first beam of the at least two beams of the plurality of beams to be a primary beam as a consequence of the determined signal-to-interference ratio (SIR) being not less than a signal-to-interference ratio (SIR) of any other beam of the at least two beams of the plurality of beams;
- the determining device for determining at least one other beam of the least two beams of the plurality of beams to be a secondary beam;
- and
- a reducing device for reducing a signaling overhead of a channel quality information (CQI) for the at least two beams of the plurality of beams by providing different reporting rates for the channel quality information (CQI) for the primary beam and the secondary beam,
- wherein providing the different reporting rates for the channel quality information (CQI) comprises providing a second reporting rate for channel quality information (CQI) transmissions relating to the secondary beam compared to a first reporting rate for channel quality information (CQI) transmissions relating to the primary beam,
- wherein providing the different reporting rates for the channel quality information (CQI) comprises providing a lower reporting rate for channel quality information (CQI) transmissions relating to the secondary beam compared to a reporting rate for channel quality information (CQI) transmissions relating to the primary beam,
- wherein a differential signaling is used to indicate a channel quality information (CQI) value for the secondary beam, and
- wherein an absolute value of the channel quality information (CQI) is signaled for the primary beam, and channel quality information (CQI) values for the secondary beam are signaled as an offset relative to the absolute value for the primary beam.
6 more elements
A user equipment, in a multi-beam transmission system, the user equipment comprising:
- a determining device for determining a received signal-to-interference ratio (SIR) of at least two beams of a plurality of beams in the multi-beam transmission system;
- the determining device for determining a first beam of the at least two beams of the plurality of beams to be a primary beam as a consequence of the determined signal-to-interference ratio (SIR) being not less than a signal-to-interference ratio (SIR) of any other beam of the at least two beams of the plurality of beams;
- the determining device for determining at least one other beam of the least two beams of the plurality of beams to be a secondary beam;
- and
- a reducing device for reducing a signaling overhead of a channel quality information (CQI) for the at least two beams of the plurality of beams by providing different reporting rates for the channel quality information (CQI) for the primary beam and the secondary beam,
- wherein providing the different reporting rates for the channel quality information (CQI) comprises providing a second reporting rate for channel quality information (CQI) transmissions relating to the secondary beam compared to a first reporting rate for channel quality information (CQI) transmissions relating to the primary beam,
- wherein a differential signaling is used to indicate a channel quality information (CQI) value for the secondary beam, and
- wherein an absolute value of the channel quality information (CQI) is signaled for the primary beam, and channel quality information (CQI) values for the secondary beam are signaled as an offset relative to the absolute value for the primary beam.
5 more elements
The user equipment according to claim 43, wherein the channel quality information (CQI) quantization granularities are predetermined.
A method for signaling channel quality information in a multi-beam transmission system, wherein a plurality of beams are simultaneously transmitted and a plurality of sets of channel quality information are transmitted for controlling independently the transmission rate on the different beams, the method comprising the steps of:
- determining, in the plurality of beams, a primary beam with a higher channel quality and at least one secondary beam with a lower channel quality;
- and
- providing a differential signaling relative to the primary beam to indicate the channel quality information value for the secondary beam(s), wherein an absolute value of the channel quality information is signaled for the primary beam, and the channel quality information values for the secondary beam(s) are signaled by means of an offset relative to the value for the primary beam.
A multi-beam transmission system, wherein a plurality of beams are simultaneously transmitted and a plurality of sets of channel quality information are transmitted for controlling independently the transmission rate on the different beams, the multi-beam transmission system comprising:
- a determining device for determining in the plurality of beams, a primary beam with a higher channel quality and at least one secondary beam with a lower channel quality resulting in effects of errors in the channel quality information transmissions for the secondary beam(s) to be less significant than effects of errors in the channel quality information for the primary beam;
- and
- an exploiting device for reducing a signaling overhead of the channel quality information for the beams by providing a differential signaling means for indicating the channel quality information value for the secondary beam(s), wherein an absolute value of the channel quality information is signaled for the primary beam, and the channel quality information values for the secondary beam(s) are signaled by means of an offset relative to the value for the primary beam.
Dependencies are inferred from the claim text.