Conditional uplink timing alignment in a mobile station device of a radio communication system

摘要

A mobile station device transmits a random access preamble to a base station device. The base station device receives the random access preamble from the mobile station device and transmits, to the mobile station device, a Random Access-Radio Network Temporary Identity (RA-RNTI) which notifies a resource assignment of a random access response. The mobile station device further monitors downlink control channels while detecting both a Cell-Radio Network Temporary Identity (C-RNTI) and the RA-RNTI, in which a downlink control channel includes the RA-RNTI and a downlink control channel includes the C-RNTI which notifies a resource assignment of downlink data. Upon detection of the C-RNTI and the RA-RNTI in a same sub-frame, the mobile station receives both the random access response and the downlink data, or receives either the random access response or the downlink data.

主权项

1. A radio communication system including:
a base station device that receives a random access preamble and transmits a random access response in response to the random access preamble, a mobile station device that transmits the random access preamble to the base station device, monitors both a Cell-Radio Network Temporary Identity (C-RNTI) and a Random Access-Radio Network Temporary Identity (RA-RNTI), and receives, upon detection of the C-RNTI and the RA-RNTI in a same sub-frame, both the random access response and the downlink data, wherein the RA-RNTI is carried by a first downlink control channel and identifies the random access response, and wherein the C-RNTI is carried by a second downlink control channel and notifies a resource assignment of downlink data.