Wireless communication system, base station apparatus, mobile station apparatus, wireless communication method and integrated circuit

Abstract

A mobile station receives downlink control information (DCI). The DCI indicates a resource assignment for a PUSCH which is transmitted using a plurality of layers. The DCI includes at least first information indicating cyclic shifts for respective ones of the layers and orthogonal code sequences for respective ones of the layers. The first information is a field of 3 bits in the DCI and is determined from a plurality of predetermined information. The plurality of predetermined information comprises second information indicating cyclic shifts for respective ones of three or more layers (which are numbered). An absolute difference in value between the cyclic shift for a first-numbered layer and the cyclic shift for a second-numbered layer is larger than an absolute difference in value between the cyclic shift for the second-numbered layer and the cyclic shift for a third-numbered layer.

1 . A base station apparatus comprising:
 a processing circuit configured to or configured to and programmed to transmit downlink control information to a mobile station apparatus, the downlink control information indicating a resource assignment for a PUSCH which is transmitted using a plurality of layers, the downlink control information including at least first information indicating cyclic shifts for respective ones of the layers and orthogonal code sequences for respective ones of the layers,   wherein the first information is a field of 3 bits in the downlink control information,   the first information is determined from a plurality of predetermined information,   the plurality of predetermined information comprises second information indicating cyclic shifts for respective ones of three or more layers,   the three or more layers are numbered, and   an absolute difference in value between the cyclic shift for a first-numbered layer of the three or more layers and the cyclic shift for a second-numbered layer of the three or more layers is larger than an absolute difference in value between the cyclic shift for the second-numbered layer and the cyclic shift for a third-numbered layer of the three or more layers.   
     
     
         2 . A mobile station apparatus comprising:
 a reception circuit configured to or configured to and programmed to receive downlink control information from a base station apparatus, the downlink control information indicating a resource assignment for a PUSCH which is transmitted using a plurality of layers, the downlink control information including at least first information indicating cyclic shifts for respective ones of the layers and orthogonal code sequences for respective ones of the layers,   wherein the first information is a field of 3 bits in the downlink control information,   the first information is determined from a plurality of predetermined information,   the plurality of predetermined information comprises second information indicating cyclic shifts for respective ones of three or more layers,   the three or more layers are numbered, and   an absolute difference in value between the cyclic shift for a first-numbered layer of the three or more layers and the cyclic shift for a second-numbered layer of the three or more layers is larger than an absolute difference in value between the cyclic shift for the second-numbered layer and the cyclic shift for a third-numbered layer of the three or more layers.   
     
     
         3 . A communication method of a mobile station apparatus, the communication method comprising:
 receiving downlink control information from a base station apparatus, the downlink control information indicating a resource assignment for a PUSCH which is transmitted using a plurality of layers, the downlink control information including at least first information indicating cyclic shifts for respective ones of the layers and orthogonal code sequences for respective ones of the layers,   wherein the first information is a field of 3 bits in the downlink control information,   the first information is determined from a plurality of predetermined information,   the plurality of predetermined information comprises second information indicating cyclic shifts for respective ones of three or more layers,   the three or more layers are numbered, and   an absolute difference in value between the cyclic shift for a first-numbered layer of the three or more layers and the cyclic shift for a second-numbered layer of the three or more layers is larger than an absolute difference in value between the cyclic shift for the second-numbered layer and the cyclic shift for a third-numbered layer of the three or more layers.