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US 9,807,749 B2Granted
Communication system
AssigneeNEC Corporation
InventorsCaroline Liang, Yassin Aden Awad, Robert Arnott
Life of this patent
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Abstract
A communication system is presented in which a communication device communicates, in at least one communication cell operated by communication apparatus, using a plurality of subframes, wherein each subframe comprises a plurality of communication resources. A respective measure of communication quality associated with each of the communication resources is obtained and a search space, comprising a set of the communication resources, is defined based on the measures of communication quality. The mobile device searches for control information in the defined search space.
Claims20
A communication device for communicating with a plurality of further communication devices in a cellular communication system, said communication device comprising:
- communication circuitry configured to communicate, in at least one communication cell operated by communication apparatus of said communication system, using a plurality of subframes, wherein each subframe comprises a plurality of communication resources;
- and
- control circuitry configured to:
- obtain respective measures of communication quality associated with each of a plurality of communication resources;
- provide information identifying said measures of communication quality to said communication apparatus;
- identify a set comprising a number of said communication resources for a control channel, formed using an aggregation of a plurality of control channel elements (CCEs), in which to search for control information transmitted by said communication apparatus wherein the presence of communication resources in said set is based on said measures of communication quality, wherein said identifying comprises:
- identifying, in order of the communication quality represented by said obtained measures of communication quality, a set of sub-bands;
- and
- finding, in the identified set of sub-bands in said order of the communication quality, CCE candidates;
- wherein said CCE candidates are added to said set of communication resources until the set for a control channel attains a size required for said aggregation;
- and
- search for control information in said set of communication resources,
- wherein a search space for the control information is determined based on both an aggregation level of the CCEs making up the control channel for the control information and a total number of the CCEs in a system bandwidth.
10 more elements
A communication apparatus for communicating with a plurality of mobile communication devices in a cellular communication system, said communication apparatus comprising:
- communication circuitry configured to communicate using a plurality of subframes with at least one mobile communication device within at least one cell, wherein each subframe comprises a plurality of communication resources and wherein the communication circuitry is further configured to receive, from said at least one mobile communication device, information identifying respective measures of communication quality associated with each of a plurality of communication resources;
- and
- control circuitry configured to:
- identify a set comprising a number of said communication resources for a control channel, formed using an aggregation of a plurality of control channel elements (CCEs), for use in potential transmission of control information for the at least one mobile communication device wherein the presence of communication resources in said set is based on said measures of communication quality, wherein said identifying comprises:
- identifying, in order of the communication quality represented by said obtained measures of communication quality, a set of sub-bands;
- and
- finding, in the identified set of sub-bands in said order of the communication quality, CCE candidates;
- wherein said CCE candidates are added to said set of communication resources until the set for a control channel attains a size required for said aggregation;
- and
- transmit control information for said at least one mobile communication device in at least a subset of said set of communication resources,
- wherein a search space for the control information is determined based on both an aggregation level of the CCEs making up the control channel for the control information and a total number of the CCEs in a system bandwidth.
8 more elements
A method performed by a communication device for communicating with a plurality of further communication devices in a cellular communication system, the method comprising:
- communicating, in at least one communication cell operated by communication apparatus of said communication system, using a plurality of subframes, wherein each subframe comprises a plurality of communication resources;
- obtaining respective measures of communication quality associated with each of a plurality of communication resources and providing information identifying said measures of communication quality to said communication apparatus;
- identifying a set comprising a number of said communication resources for a control channel, formed using an aggregation of a plurality of control channel elements (CCEs), in which to search for control information transmitted by said communication apparatus wherein the presence of communication resources in said set is based on said measures of communication quality, wherein said identifying comprises:
- identifying, in order of the communication quality represented by said obtained measures of communication quality, a set of sub-bands;
- and
- finding, in the identified set of sub-bands in said order of the communication quality, CCE candidates;
- wherein said CCE candidates are added to said set of communication resources until the set for a control channel attains a size required for said aggregation;
- and
- searching for control information in said set of communication resources
- wherein a search space for the control information is determined based on both an aggregation level of the CCEs making up the control channel for the control information and a total number of the CCEs in a system bandwidth.
7 more elements
A method performed by a communication apparatus for communicating with a plurality of mobile communication devices in a cellular communication system, the method comprising:
- operating at least one communication cell;
- communicating using a plurality of subframes with at least one mobile communication device within said at least one cell, wherein each subframe comprises a plurality of communication resources;
- receiving, from said at least one mobile communication device, information identifying respective measures of communication quality associated with each of a plurality of communication resources;
- identifying a set comprising a number of said communication resources for a control channel, formed using an aggregation of a plurality of control channel elements (CCEs), for use in potential transmission of control information for the at least one mobile communication device wherein the presence of communication resources in said set is based on said measures of communication quality, wherein said identifying comprises:
- identifying, in order of the communication quality represented by said obtained measures of communication quality, a set of sub-bands;
- and
- finding, in the identified set of sub-bands in said order of the communication quality, CCE candidates;
- wherein said CCE candidates are added to said set of communication resources until the set for a control channel attains a size required for said aggregation;
- and
- transmitting said CCE for said at least one mobile communication device in at least a subset of said set of communication resources;
- wherein a search space for the control information is determined based on both an aggregation level of the CCEs making up the control channel for the control information and a total number of the CCEs in a system bandwidth.
8 more elements
Dependencies are inferred from the claim text.