BASE STATION APPARATUS, MOBILE STATION APPARATUS, AND MOBILE STATION CONTROL METHOD IN MOBILE COMMUNICATION SYSTEM

• US 20110051609A1
• Filed: 06/27/2008
• Published: 03/03/2011
• Est. Priority Date: 08/27/2007
• Status: Abandoned Application

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Ooya, Tomoyuki, Mori, Shinichi, Ishii, Akira, Hosono, Hiroyuki
• Application Number:
  US12/674,850
• Publication Number:
  US 20110051609A1
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A disclosed base station apparatus in a mobile communication system includes a receiving unit receiving a random access channel transmitted from a mobile station apparatus, an acquisition unit acquiring random access channel quality based on a measurement of the received random access channel or a report from the mobile station apparatus, a calculation unit calculating random access channel parameters based on the acquired random access channel quality, and a broadcast unit broadcasting the calculated random access channel parameters to all the mobile stations within a coverage area of the base station.

Claims

1. A base station apparatus in a mobile communication system, the base station apparatus comprising:

a receiving unit configured to receive a random access channel transmitted from a mobile station apparatus;

an acquisition unit configured to acquire random access channel quality based on a measurement of the received random access channel or a report from the mobile station apparatus;

a calculation unit configured to calculate random access channel parameters based on the acquired random access channel quality; and

a broadcast unit configured to broadcast the calculated random access channel parameters to all the mobile stations within a coverage area of the base station.

2. The base station apparatus according to claim 1, wherein

the random access channel quality includes at least one of a retransmission number of the random access channel, a retransmission number of the random access at a maximum transmission power level under a control of increasing a transmission power level of the random access channel when a receipt of the random access channel is failed in the base station apparatus, a success probability of the random accesses, a detection probability of the random access channel, a number of mobile station apparatuses having attempted to perform the random accesses per unit time, a number of mobile station apparatuses having succeeded to perform the random access per unit time, and a number of mobile station apparatuses having failed to perform the random access per unit time.

3. The base station apparatus according to claim 1, wherein

the random access channel parameters includes at least one of time, frequency, an allocated amount of code or space, initial transmission power level, increase of transmission power, a maximum retransmission number, a number of signatures, and a number of sub-channels.

7. The base station apparatus according to claim 2, wherein

the random access channel parameters includes at least one of time, frequency, an allocated amount of code or space, initial transmission power level, increase of transmission power, a maximum retransmission number, a number of signatures, and a number of sub-channels.

4. A mobile station apparatus in a mobile communication system, the mobile station apparatus comprising:

a measurement unit configured to measure random access channel quality;

a reporting unit configured to report the measured random access channel quality to a base station apparatus;

a receiving unit configured to receive random access channel parameters broadcasted from the base station apparatus;

a control unit configured to control the random access channel parameters; and

a transmission unit configured to transmit a random access channel based on the controlled random access channel parameters.

5. The mobile station apparatus according to claim 4, wherein

the random access channel quality includes at least one of a retransmission number of the random access channel, a retransmission number of the random access at a maximum transmission power level under a control of increasing a transmission power level of the random access channel when a receipt of the random access channel is failed in the base station apparatus, a success probability of the random accesses, and a detection probability of the random access channel.

6. A control method used in a base station apparatus mobile in a mobile communication system, the control method comprising the steps of:

receiving a random access channel transmitted from a mobile station apparatus;

acquiring random access channel quality based on a measurement of the received random access channel or a report from the mobile station apparatus;

calculating random access channel parameters based on the acquired random access channel quality; and

broadcasting the calculated random access channel parameters to all the mobile stations within a coverage area of the base station.