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

• US 7,206,587 B2
• Filed: 12/18/2002
• Issued: 04/17/2007
• Est. Priority Date: 08/02/2000
• Status: Expired due to Term

• Current Assignee: INVT SPE LLC (SoftBank Group Corp.)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Miyoshi, Kenichi, Kato, Osamu, Aizawa, Junichi
• Primary Examiner(s): LE, DANH C
• Application Number:
  US10/321,623
• Publication Number:
  US 20040203829A1
• Time in Patent Office: 1,581 Days
• Field of Search: 455/522, 455/69, 455/68, 455/67.11, 455/561, 455/127, 455/452.2, 455/452.1, 370/347, 370/335, 370/336, 370/529, 370/337, 370/476, 370/318, 370/310
• US Class Current: 455/452.2
• 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 measuring device that measures downlink channel quality; and

a transmitter that transmits a notification signal to notify a base station apparatus of information generated based on said measured downlink channel quality, wherein;

the information of the notification signal, prior to its transmission, is converted to a code word whose code-word minimum distance is proportional to the degree of measured downlink channel quality.

2. A communication terminal apparatus, comprising:

a measuring device that measures downlink channel quality;

a transmitter that transmits a notification signal to notify a base station apparatus of information generated based on said measured downlink channel quality;

a table that indicates a correspondence between the notification signal and a code word; and

a rewriting device that rewrites contents of said table in accordance with a control signal from the base station apparatus, wherein;

the transmitter converts the notification signal, prior to its transmission, to a code word based on the contents of said table.

3. A communication terminal apparatus comprising:

a measuring device that measures downlink channel quality; and

a transmitter that transmits a notification signal to notify a base station apparatus of information generated based on said measured downlink channel quality, wherein;

each of a plurality of digits representing the information of the notification signal is converted, prior to its transmission, to a code word whose code length is proportional to the digit'"'"'s degree of significance.

4. A communication terminal apparatus comprising:

a measuring device that measures reception quality of a pilot signal to output information having a plurality of bits that indicate the measured reception quality;

a coding device that encodes the information to obtain a code word; and

a transmitter that transmits the code word, wherein;

the coding device encodes the information such that the most significant bit of the plurality of bits is less susceptible to errors in a propagation path than other bits of the plurality of bits.