Base station and radio communication method by a base station
View Patent ↗A communication terminal apparatus that exhibits a shorter time period required until a start of communication and causes the throughput in the wireless communication system to be less reduced. In this apparatus, when the number, N, of retransmissions notified by a response determining part ( 107 ) is zero, a subchannel-to-be-used selecting part ( 108 ) selects a subchannel, among others, which exhibits the highest order one of the reception qualities of the subchannels notified by a reception quality determining part ( 106 ), and then notifies the selected subchannel to a subchannel allocating part ( 113 ). When the notified number, N, of retransmissions is one or more, the response determining part ( 107 ) selects a subchannel which exhibits the N-th lower order reception quality than the highest order reception quality, based on the reception qualities of the subchannels notified by the reception quality determining part ( 106 ) for a pilot signal received after a transmission of the latest access request signal, and then notifies the selected subchannel to the subchannel allocating part ( 113 ).
1. A base station comprising:
a receiving unit configured to receive a random access signal;
a transmitting unit configured to transmit a random access response after the receiving unit receives the random access signal within a response time period;
wherein the receiving unit receives a retransmitted random access signal after elapse of the response time period without being set a back-off time, in the case where the random access signal cannot be received by the base station.
2. A radio communication method by a base station, comprising:
receiving a random access signal;
transmitting a random access response after the receiving of the random access signal within a response time period;
wherein the receiving unit receives a retransmitted random access signal without being set a back-off time after elapse of the response time period, in the case where the random access signal cannot be received by the base station.
3. A base station comprising:
a receiving unit configured to receive a random access signal;
a transmitting unit configured to transmit a random access response after the receiving unit receives the random access signal within a response time period;
wherein the receiving unit receives a retransmitted random access signal after elapse of the response time period without being set a back-off time, in the case where the base station cannot transmit the random access response.
4. A radio communication method by a base station, comprising:
receiving a random access signal;
transmitting a random access response after the receiving of the random access signal within a response time period;
wherein the receiving unit receives a retransmitted random access signal without being set a back-off time after elapse of the response time period, in the case where the base station cannot transmit the random access response.