Radio base station apparatus and radio transmitting method

• US 20040152490A1
• Filed: 12/01/2003
• Published: 08/05/2004
• Est. Priority Date: 03/07/2002
• Status: Abandoned Application

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Miyoshi, Kenichi, Aoyama, Takahisa
• Application Number:
  US10/479,229
• Publication Number:
  US 20040152490A1
• Time in Patent Office: Days
• US Class Current: 455/560
• CPC Class Codes: H04W 16/24 Cell structures
• CPC Class Codes: H04W 16/28 using beam steering
• CPC Class Codes: H04W 48/12 using downlink control channel
• CPC Class Codes: H04W 72/54 based on quality criteria

Abstract

Directivity control is executed during transmission such that the directivity pattern of the S-CPICH (Secondary Common Pilot Channel) and the directivity pattern of the DSCH (Downlink Shared Channel) are oriented in different directions. That is, the directivity pattern of a known signal is made oriented in a different directions than the directivity pattern of packet data. As a result, interference between the S-CPICH and the DSCH is restrained, so as to make a communication terminal apparatus capable of accurate channel quality detection. At a base station, based on the result of this channel quality detection, the priority of a data packet transmitted by the DSCH is determined.

Claims

1. A wireless base station apparatus comprising:

a first directional transmitter that directionally transmits a known signal to a plurality of communication terminal apparatuses engaged in communication;

a receiver that receives channel quality information from each communication terminal apparatus, said information concerning channel quality at said each communication terminal apparatus upon reception of the known signal;

a priority determiner that determines priority in data transmission in descending order of channel quality, based on the channel quality information;

a second directional transmitter that directionally transmits packet data to said communication terminal apparatuses following the determined order of priority; and

a directivity controller that controls directivity patterns of the first and second directional transmitters such that the directivity pattern formulated by the first directional transmitter and the directivity pattern formulated by the second directional transmitter are oriented in different directions.

2. The wireless base station apparatus according to claim 1, wherein the directivity controller controls directivity of the first directional transmitter more preferentially than directivity of the second directional transmitter, and controls the directivity of the second directional transmitter such that the directivity of the second directional transmitter is oriented in a different direction than the directivity of the first directional transmitter.

3. The wireless base station apparatus according to claim 1, wherein the directivity controller controls directivity of the second directional transmitter more preferentially than directivity of the first directional transmitter based on the priority at the priority determiner, and controls the directivity of the first directional transmitter such that the directivity of the first directional transmitter is oriented in a different direction than the directivity of the second directional transmitter.

4. The wireless base station apparatus according to claim 1, wherein the directivity controller determines a directivity pattern based on a gain attenuation level of one or both of the first and second directional transmitters such that signals from the first and second directional transmitters do not interfere with each other.

5. The wireless base station apparatus according to claim 1, wherein the directivity controller gathers a plurality of adjacent directivity patterns and groups said directivity patterns as one group, and controls directivity patterns of the first and second directional transmitters such that the first directional transmitter and the second directional transmitter formulate directivities in different groups.

6. A wireless base station apparatus comprising:

a first directional transmitter that directionally transmits a known signal to a plurality of communication terminal apparatuses engaged in communication;

a receiver that receives channel quality information from each communication terminal apparatus, said information concerning channel quality at said each communication terminal apparatus upon reception of the known signal;

a priority determiner that determines priority in data transmission in descending order of channel quality, based on the channel quality information;

a second directional transmitter that directionally transmits packet data to said communication terminal apparatuses following the determined order of priority; and

a channel quality corrector that calculates an level of attenuation in the channel quality of when the first directional transmitter and the second directional transmitter formulate directivities in overlapping directions by means of the directivity controller, and corrects the channel quality based on said level of attenuation,

wherein the priority determiner determines priority based on the corrected channel quality obtained by the channel quality corrector.

7. The wireless base station apparatus according to claim 6, wherein the channel quality corrector calculates the level of attenuation based on a ratio of transmission power between the first directional transmitter and the second directional transmitter.

8. The wireless base station apparatus according to claim 6, wherein the channel quality corrector calculates the level of attenuation based on the number of multipaths transmitted from the communication terminal apparatuses.

9. A wireless transmission method comprising:

directionally transmitting a known signal to a plurality of communication terminal apparatuses engaged in communication;

receiving channel quality information from each communication terminal apparatus, said information concerning channel quality at said each communication terminal apparatus upon reception of the known signal;

determining priority in data transmission in descending order of channel quality, based on the channel quality information;

directionally transmitting packet data to said communication terminal apparatuses following the determined order of priority; and

controlling the directivity patterns such that the directivity pattern of the known signal and the directivity pattern of the packet data are oriented in different directions.