Patent ID: 9655101
Date: 2017-05-16
CPC Classifications: H04L,H04W

Claim:
1. A transmission apparatus comprising: circuitry, which, in operation: configures a first search space according to a first search space configuration rule or configures a second search space according to a second search space configuration rule, wherein the first search space configuration rule defines a number of first decoding region candidates corresponding to first control channel element (CCE) aggregation levels, and the second search space configuration rule defines a number of second decoding region candidates corresponding to second CCE aggregation levels, wherein the second CCE aggregation levels at least partially overlap with the first CCE aggregation levels and include at least one aggregation level smaller than any of the first CCE aggregation levels, and maps downlink control information on one of a plurality of decoding region candidates included in the first search space or on one of a plurality of decoding region candidates included in the second search space, each decoding region candidate being composed of a CCE or a plurality of aggregated CCEs with one of the first or second CCE aggregation levels defined by the first or second search space configuration rules, wherein a weighted average of CCE aggregation levels with respect to the number of the decoding region candidates according to the first search space configuration rule is greater than that of the second search space configuration rule, and the weighted average is calculated by dividing a sum of the products of CCE aggregation levels and corresponding number of decoding region candidates by a sum of the number of decoding region candidates for each search space configuration rule; and a transmitter, which, in operation, transmits a signal including the mapped downlink control signal.