Radio communications system, base station apparatus and method of transmission power control

• US 7,907,962 B2
• Filed: 03/10/2005
• Issued: 03/15/2011
• Est. Priority Date: 04/27/2004
• Status: Active Grant

• Current Assignee: Kyocera Corporation
• Original Assignee: Kyocera Corporation
• Inventors: Shoji, Hiroyuki
• Primary Examiner(s): Nguyen; Duc M.
• Assistant Examiner(s): Rego; Dominic E
• Application Number:
  US11/587,612
• Publication Number:
  US 20080102875A1
• Time in Patent Office: 2,196 Days
• Field of Search: 455/522, 455/67.11, 455 68- 70, 455/115.3, 455/126, 455/127.1, 455/127.2, 455/135, 455/226.3, 455/277.2, 455/296, 370/318
• US Class Current: 455/522
• CPC Class Codes: H04W 52/16 Deriving transmission power values from another channel
• CPC Class Codes: H04W 52/42 in systems with time, space, frequency or polarisation diversity

Abstract

A transmission power of a communication apparatus can be appropriately determined in accordance with different communication multiplicities between two or more communication channels. A mobile communication system in which a base station apparatus and a mobile station apparatus communicate with each other by using configuration channels (CCH) or random access channels (RACH) includes a transmission power control part for determining basic data of the transmission power in RACH of the mobile station apparatus in accordance with a communication status in CCH, and a transmission power determining part for determining the transmission power in RACH of the mobile station apparatus by changing the basic data at least in accordance with the communication multiplicity of RACH.

Claims

1. A radio communications system including a plurality of communication apparatuses, comprising:

a first communication device which a first communication apparatus and a second communication apparatus communicate with each other by using a first communication channel, wherein said first communication channel is a configuration channel;

a second communication device which the first communication apparatus and the second communication apparatus communicate with each other by using a second communication channel, wherein said second communication channel is a random access channel;

a transmission power basic data determiner which determines basic data of a transmission power in the second communication channel of the second communication apparatus in accordance with a communication status in the first communication channel; and

a transmission power determiner which determines the transmission power in the second communication channel of the second communication apparatus by changing the determined basic data of the transmission power at least in accordance with a communication multiplicity of the second communication channel, wherein said communication multiplicity is the number of users communicating in the random access channel.

2. A radio communications system according to claim 1, wherein

the transmission power determiner changes the determined basic data of the transmission power further in accordance with a communication multiplicity of the first communication channel.

3. A radio communications system according to claim 1 or 2, wherein

the transmission power determiner determines the transmission power in the second communication channel of the second communication apparatus in such a way that the higher the communication multiplicity of the second communication channel, the greater this transmission power.

4. A radio communications system according to claim 1 or 2, wherein

at least the communication multiplicity in the second communication channel is a spatial multiplicity.

5. A base station apparatus used in a mobile communication system, comprising:

a first communication device for communicating with a mobile station apparatus by using a first communication channel, wherein said first communication channel is a configuration channel;

a second communication device for communicating with the mobile station apparatus by using a second communication channel, wherein said second communication channel is a random access channel; and

a transmission power determiner which determines the amount of change in basic data of a transmission power determined by a transmission power basic data determiner at least in accordance with a communication multiplicity of the second communication channel, wherein said communication multiplicity is the number of users communicating in the random access channel.

6. A transmission power control method, comprising:

a first communication step in which a first communication apparatus and a second communication apparatus communicate with each other by using a first communication channel, wherein said first communication channel is a configuration channel;

a second communication step in which the first communication apparatus and the second communication apparatus communicate with each other by using a second communication channel, wherein said second communication channel is a random access channel;

a step of determining basic data of a transmission power in the second communication channel of the second communication apparatus in accordance with a communication status in the first communication channel; and

a step of determining the transmission power in the second communication channel of the second communication apparatus by changing the determined basic data of the transmission power at least in accordance with a communication multiplicity of the second communication channel, wherein said communication multiplicity is the number of users communicating in the random access channel.