BASE STATION, TERMINAL, TRANSMISSION METHOD AND RECEPTION METHOD

摘要

In the base station (100), a search space setting unit (103) sets a search space on the basis of a search space setting rule in accordance with R-PDCCH range of a setting target slot, and an allocating unit (108) places DCI in one of a plurality of candidates of to-be-decoded unit range included in the set search space. The search space setting rules are associated with respective numbers of candidates of to-be-decoded unit range corresponding to the respective ones of a plurality of numbers of connections for R-CCE, and a first search space setting rule of a slot 0 and a second search space setting rule of a slot 1 are different from each other in terms of the patterns related to the numbers of candidates of to-be-decoded unit range corresponding to the plurality of numbers of connections for R-CCE.

主权项

1. A terminal apparatus comprising:
a receiver which, in operation, receives a signal including downlink control information which is mapped to a first search space configured according to a first search space configuration rule or a second search space configured 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 each of first control channel element (CCE) aggregation levels, and the second search space configuration rule defines a number of second decoding region candidates corresponding to each of second CCE aggregation levels, wherein the second CCE aggregation levels overlap with the first CCE aggregation levels and include at least one aggregation level smaller than any of the first CCE aggregation levels; and a decoder which, in operation, decodes a plurality of decoding region candidates included in the first search space or a plurality of decoding region candidates included in the second search space to acquire the downlink control information, 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 number of resource elements (REs) that compose one CCE according to the first search space configuration rule is smaller than that of the second search space configuration rule, 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.