Patent ID: 9391737
Filing Date: 2016-07-12
CPC Classification: H04L,H04W

Claim Text:
1. A method for a user equipment (UE) to perform decoding operations for two types of physical downlink control channels (PDCCHs), the method comprising the steps of: receiving, by the UE, from a base station, signaling informing one of a first set of resources and a second set of resources; determining a respective number of candidate PDCCHs of a first type using one of the first set of resources and a respective number of candidate PDCCHs of a second type using the second set of resources; decoding, by the UE, for at least one aggregation level of control channel elements (CCEs) in a first set of aggregation levels of CCEs, the candidate PDCCHs of the first type in a first search space of the first set of resources if the first set of resources is informed by the signaling, wherein a transmission of a PDCCH of the first type is distributed in multiple physical resource blocks (PRBs); and decoding, by the UE, for at least one aggregation level of CCEs in a second set of aggregation levels of CCEs, the candidate PDCCHs of the second type in a second search space of the second set of resources if the second set of resources is informed by the signaling, wherein a transmission of a PDCCH of the second type is localized in a single PRB, wherein the first search space in the first set of resources is determined based on a first random variable that is derived from a transmission time interval (TTI) and a UE identifier and the second search space in the second set of resources is determined based on a second random variable that is derived from the TTI and the UE identifier.