Mobile communication system, mobile communication method, and mobile station suitably used for the same

• US 7,328,024 B2
• Filed: 10/02/2003
• Issued: 02/05/2008
• Est. Priority Date: 10/04/2002
• Status: Expired due to Fees

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Moon, Sung Uk, Nakamura, Takehiro, Ishii, Minami, Usuda, Masafumi
• Primary Examiner(s): Nguyen, Simon
• Application Number:
  US10/675,967
• Publication Number:
  US 20040137867A1
• Time in Patent Office: 1,587 Days
• Field of Search: 455/425, 455509-510, 455/515, 455/517, 455/63.1, 455/67.13, 455/69, 455/70, 455/226.2, 455/226.3, 455/16, 455/24, 455450-4522, 455/522, 370230-2351, 370/252, 370/243, 370329-330
• US Class Current: 455/450
• CPC Class Codes: H04L 1/0045 Arrangements at the receiver end
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence

Abstract

The object of the present invention is provide a mobile communication system which can reduce power consumption of a mobile station without increasing the number of times the data signals which are to be received by the mobile station are retransmitted. The base station 10 comprises a signal transmitter 11 configured to transmit the data signal a to the mobile station 30 within a predetermined period, and transmit each of retransmission signals a1 to a3 of the data signal a, in a form different from that of the data signal a, from the base station 10 to the mobile station 30 within the predetermined period A. The mobile station 30 comprises a receiving processor 31 configured to carry out receiving processing of the data signal a or the retransmission signal a1 within the predetermined period A; a communication quality detector 32 configured to detect a communication quality of the data signal a or the retransmission signal a1; and a reception processing method decider 33 configured to decide a reception processing method for the data signal a or the retransmission signal a1 in the predetermined period A, in accordance with the communication quality detection result.

Claims

1. A mobile communication system which transmits a data signal from a base station to a mobile station, wherein

the base station comprises a signal transmitter configured to transmit, to the mobile station, both the data signal, and at least one retransmission signal of the same data signal, in a different form from the same data signal, within a predetermined period set for transmission of at least one series of the data signal and the at least one retransmission signal;

the mobile station comprises;

a receiving processor configured to carry out a receiving process on the data signal or the at least one retransmission signal within the predetermined period;

a communication quality detector configured to detect a communication quality of the data signal or the at least one retransmission signal; and

a reception processing method decider configured to decide a reception processing method for the data signal or the at least one retransmission signal in the predetermined period, based on the detected communication quality.

2. The mobile communication system of claim 1, wherein the communication quality detector is configured to detect at least one of a signal-to-interference ratio (SIR) and a received power as the communication quality.

3. The mobile communication system of claim 2, wherein the signal transmitter is configured to transmit the data signal and the at least one retransmission signal as a different encoding series by changing rate matching parameters between the data signal and the at least one retransmission signal within a predetermined period.

4. The mobile communication system of claim 1, wherein the signal transmitter is configured to transmit the data signal and the at least one retransmission signal as a different encoding series by changing rate matching parameters between the data signal and the at least one retransmission signal within a predetermined period.

5. A mobile communication method for transmitting a data signal from a base station to a mobile station, the method comprising:

transmitting, from the base station to the mobile station, both the data signal and at least one retransmission signal of the same data signal, in a different form from the same data signal, within a predetermined period set for transmission of at least one series of the data signal and the at least one retransmission signal;

carrying out a receiving process on the data signal or the at least one retransmission signal within the predetermined period in the mobile station;

detecting a communication quality of the data signal or the at least one retransmission signal in the mobile station; and

deciding a reception processing method for the data signal or the at least one retransmission signal in the predetermined period, based on the detected communication quality.

6. The mobile communication method of claim 5, where detecting the communication quality further comprises detecting at least one of a signal-to-interference ratio (SIR) and a received power as the communication quality.

7. The mobile communication method of claim 6, wherein transmitting the data signal or the at least one retransmission signal further comprises transmitting the data signal and the at least one retransmission signal as a different encoding series by changing rate matching parameters between the data signal and the at least one retransmission signal within a predetermined period.

8. The mobile communication method of claim 5, wherein transmitting the data signal or the at least one retransmission signal further comprises transmitting the data signal and the at least one retransmission signal as a different encoding series by changing rate matching parameters between the data signal and the at least one retransmission signal within a predetermined period.

9. A mobile station for receiving a data signal from a base station, the mobile station comprises:

a receiving processor configured to carry out a receiving process on the data signal or the at least one retransmission signal of the same data signal, within a predetermined period set for transmission of at least one series of the data signal and the at least one retransmission signal;

a communication quality detector configured to detect a communication quality of the data signal or the at least one retransmission signal; and

a reception processing method decider configured to decide a reception processing method for the data signal or the at least one retransmission signal in the predetermined period, based on the detected communication quality.

10. The mobile station according to claim 9, wherein the communication quality detector is configured to detect at least one of a signal-to-interference ratio (SIR) and a received power as the communication quality.