Mobile station apparatus, base station apparatus, wireless communication system, and wireless communication method

摘要

Provided are a mobile station apparatus, a wireless communication system, and a wireless communication method that can improve reliability of handover while efficiently and early completing the handover. A mobile station apparatus 100 that switches base station apparatuses 200a and 200b to communicate with by handover includes: receiving an HO Command message including scheduled uplink transmission information from the base station apparatus of a handover source 200a; performing uplink transmission to the base station apparatus of a handover destination 200b based on the scheduled uplink transmission information; and executing handover in accordance with a random access procedure if a response is not received from the base station apparatus of a handover destination 200b with respect to a single time or plural times of the uplink transmission.

主权项

1. A mobile station apparatus that switches a base station apparatus to communicate with by handover, comprising:
receiving a handover command message including scheduled uplink transmission information of a base station apparatus of a handover destination from a base station apparatus of a handover source; performing uplink transmission to said base station apparatus of a handover destination based on said scheduled uplink transmission information; and executing a random access procedure to said base station apparatus of a handover destination if a response is not received from said base station apparatus of a handover destination even though a number of times of transmission of said uplink transmission has reached a number of times of transmission specified by said scheduled uplink transmission information, wherein said random access procedure is a procedure in which the mobile station apparatus transmits a random access preamble to the base station apparatus and the mobile station apparatus receives a response to the random access preamble; determining that handover has failed if the random access procedure is not completed; receiving a handover command message including uplink shared channel transmission information of a base station apparatus of a handover destination from said base station apparatus of a handover source; transmitting data to an uplink shared channel of said base station apparatus of a handover destination based on said physical uplink shared channel transmission information; and executing the random access procedure to said base station apparatus of a handover destination if a response is not received from said base station apparatus of a handover destination even though a number of times of transmission of data to said uplink shared channel has reached a number of times of retransmission of a hybrid ARQ specified by said uplink shared channel transmission information; and determining that handover has failed if the random access procedure is not completed.