WIRELESS COMMUNICATION TERMINAL APPARATUS AND CQI SELECTING METHOD

• US 20090111384A1
• Filed: 08/17/2006
• Published: 04/30/2009
• Est. Priority Date: 08/18/2005
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Seidel, Eiko, Nishio, Akihiko, Kuri, Kenichi, Miyoshi, Kenichi, Imamura, Daichi, Wengerter, Christian, Yoshii, Isamu, Golitschek Edler Von Elbwart, Alexander
• Granted Patent: US 7,853,217 B2
• Time in Patent Office: Days
• US Class Current: 455/67.110
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0015 characterised by the adaptation strategy
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 27/2626 Arrangements specific to the transmitter only
• CPC Class Codes: H04L 27/2647 Arrangements specific to the receiver only equalisation H04L27/01
• CPC Class Codes: H04L 5/0046 Determination of how many bits are transmitted on different sub-channels
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling

Abstract

A wireless communication terminal apparatus and a CQI selecting method wherein when CQIs are grouped according to their levels and then an upper-order CQI, which is indicative of a group, is to be informed in a longer period, while a lower-order CQI, which identifies a CQI in the group, being to be informed in a shorter period, the CQI is precisely selected. A reception SIR range of 0-4 dB in UE corresponds to a level 1 of upper-order CQI. A next reception SIR range of 4-8 dB corresponds to a level 2 of upper-order CQI. Similarly, the following SIR ranges up to 24 dB, each of which is 4 dB higher than a respective previous one, correspond to the respective following levels of upper-order CQI. On the other hand, the levels 1-4 of lower-order CQI, with which the level 1 of upper-order CQI is associated, correspond to a SIR range of −1-5 dB. The levels 1-4 of lower-order CQI, with which the level 2 of upper-order CQI is associated, correspond to a SIR range of 2-9 dB. Thus, the SIR ranges, to which the lower-order CQIs correspond, overlap the respective SIR ranges corresponding to the respective adjacent levels of upper-order CQIs with which the lower-order CQIs are associated.

Claims

1. A radio communication terminal apparatus comprising:

a storage section that stores channel quality indicator information comprising higher channel quality indicators specifying channel quality indicator groups divided by levels and lower channel quality indicators specifying channel quality indicators in a group specified by a higher channel quality indicator and specifying part of channel quality indicators in an adjacent group of the group specified by the higher channel quality indicator;

a channel quality indicator signal generating section that generates a higher channel quality indicator signal in a first cycle and a lower channel quality indicator signal in a second cycle shorter than the first cycle, according to the channel quality indicator information; and

a transmitting section that transmits the generated higher channel quality indicator signal and lower channel quality indicator signal.

2. The radio communication terminal apparatus according to claim 1, wherein the storage section stores the channel quality indicator information setting a signal to interference ratio associated with a lower channel quality indicator to overlap with a signal to interference ratio of a higher channel quality indicator of an adjacent level to a higher channel quality indicator associated with the lower channel quality indicator.

3. The radio communication terminal apparatus according to claim 1, wherein the storage section stores the channel quality indicator information setting the number of information bits associated with the lower channel quality indicator to overlap with the number of information bits of a higher channel quality indicator of an adjacent level to the higher channel quality indicator associated with the lower channel quality indicator.

4. A radio communication base station comprising:

a receiving section that receives higher channel quality indicator signals specifying channel quality indicator groups divided by levels and lower channel quality indicator signals specifying channel quality indicators in a group specified by a higher channel quality indicator signal and specifying part of the channel quality indicators in an adjacent group of the group specified by the higher channel quality indicator;

a modulation and coding scheme assigning section that assigns a higher modulation and coding scheme signal specifying a modulation and coding scheme group divided by levels according to the received higher channel quality indicator signal;

a lower modulation and coding scheme assigning section that assigns a lower modulation and coding scheme signal specifying modulation and coding scheme in a group specified by the higher modulation and coding scheme signal or specifying part of modulation and coding scheme in an adjacent group of the group specified by the higher modulation and coding scheme signal; and

a transmitting section that transmits an assigned higher modulation and coding scheme assignment signal and an assigned lower modulation and coding scheme assignment signal.

5. A channel quality indicator selecting method comprising selecting a higher channel quality indicator in a first cycle and a lower channel quality indicator in a second cycle shorter than the first cycle, according to channel quality indicator information setting a higher channel quality indicator signal specifying a channel quality indicator group divided by levels and a lower channel quality indicator signal specifying channel quality indicator in the group specified by the higher channel quality indicator signal and specifying part of the channel quality indicator in an adjacent group of the group specified by the higher channel quality indicator.