Communication terminal apparatus, base station apparatus, and radio communication method

• US 6,760,590 B2
• Filed: 04/01/2002
• Issued: 07/06/2004
• Est. Priority Date: 08/02/2000
• Status: Expired due to Term

• Current Assignee: INVT SPE LLC (Government of ABU Dhabi)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Miyoshi, Kenichi, Kato, Osamu, Aizawa, Junichi
• Primary Examiner(s): Trost, William
• Assistant Examiner(s): LE, DANH C
• Application Number:
  US10/089,605
• Publication Number:
  US 20020151311A1
• Time in Patent Office: 827 Days
• Field of Search: 455/452.1, 455/450, 455/452.2, 455/517, 455/422.1, 455/423, 455/464, 370/329, 370/330, 370/335, 370/342, 370/341, 375/244, 375/246
• US Class Current: 455/452.1
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04W 52/143 Downlink power control
• CPC Class Codes: H04W 52/24 using SIR [Signal to Interference Ratio] or other wireless path parameters
• CPC Class Codes: H04W 52/247 where the output power of a terminal is based on a path parameter sent by another terminal
• CPC Class Codes: H04W 52/325 Power control of control or pilot channels
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/54 based on quality criteria
• CPC Class Codes: H04W 72/542 using measured or perceived quality

Abstract

A communication mode determination section 201 determines the communication mode based on the CIR measured by a CIR measurement section 219; a DRC signal creation section 202 creates a DRC signal with a number corresponding to the communication mode; and a DRC power controller 205 refers to a transmission power table 206 showing the correspondence between DRC numbers and transmission power, and, based on the transmission power of the pilot signal output from a pilot power controller 209, increases transmission power in proportion as the DRC signal indicates that downlink channel quality is good.

Claims

1. A communication terminal apparatus comprising:

a measurer that measures a downlink channel quality and outputs information that is generated in association with said downlink channel quality and composed of a plurality of digits including an upper digit and a lower digit;

a coder that encodes the information such that the upper digit has a larger code word minimum distance than the lower digit; and

a transmitter that transmits the encoded information to a base station apparatus.

2. The communication terminal apparatus according to claim 1, wherein the upper digit contains a most significant bit of the information.

3. A communication terminal apparatus comprising:

a measurer that measures a downlink channel quality and outputs information that is generated in association with said downlink channel quality and composed of a plurality of digits including an upper digit and an lower digit;

a coder that encodes the information such that the upper digit is assigned a larger number of bits than the lower digit; and

a transmitter that transmits the encoded information to a base station apparatus.

4. The communication terminal apparatus according to claim 3, wherein the upper digit contains a most significant bit of the information.

5. A coding and transmission method for use in a communication system where a base station apparatus assigns a downlink channel to each of a plurality of communication terminal apparatuses on a time division basis, wherein said each of a plurality of communication terminal apparatuses:

encodes information that is used for the assignment of the downlink channel and composed of a plurality of digits including an upper digit and a lower digit such that the upper digit has a larger code word minimum distance than the lower digit; and

transmits the encoded information to said base station apparatus.

6. The coding and transmission method according to claim 5, wherein the upper digit contains a most significant bit of the information.

7. A coding and transmission method for use in a communication system where a base station apparatus assigns a downlink channel to each of a plurality of communication terminal apparatuses on a time division basis, wherein said each of a plurality of communication terminal apparatuses:

encodes information that is used for the assignment of the downlink channel and composed of a plurality of digits including an upper digit and a lower digit such that the upper digit is assigned a larger number of bits than the lower digit; and

transmits the encoded information to said base station apparatus.

8. The coding and transmission method according to claim 7, wherein the upper digit contains a most significant bit of the information.