Mobile communications system and radio base station apparatus

• US 6,615,030 B1
• Filed: 09/06/2000
• Issued: 09/02/2003
• Est. Priority Date: 02/09/2000
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd., KDDI Corporation
• Original Assignee: Hitachi, Ltd., DDI Corporation (TTM Technologies Incorporated)
• Inventors: Takeuchi, Yoshio, Niida, Sumaru, Suzuki, Toshinori, Nakahara, Naruhito, Saito, Joichi, Ishida, Yuuji, Tsubaki, Naoki
• Primary Examiner(s): Le, Thanh Cong
• Assistant Examiner(s): TRAN, TUAN A
• Application Number:
  US09/656,139
• Time in Patent Office: 1,091 Days
• Field of Search: 455/560, 455/561, 455/295, 455/296, 455/278.1, 455/279.1, 375/345, 375/346, 375/349
• US Class Current: 455/296
• CPC Class Codes: H04B 1/71075 Parallel interference cancellation

Abstract

In order to prevent decrease of channel efficiency and to effectuate high quality communication while moderating increase of apparatus scale of an interference canceler part and cutting down costs, in a mobile communication and radio base station apparatus according to the present invention, an interference cancel processing part within the base station apparatus is provided with reverse spread processing/respread processing parts for performing reverse spread processing and respread processing on received signals, synthesizing processing parts for synthesizing signals that have been subjected to the respread processing, and subtraction processing parts for subtracting the synthesized signal from received signal, in multiple stages. The interference cancel processing part processes received signals of users #1-#k. As a demodulation processing part, there is provided n demodulation processing parts that perform demodulation processing for received signals of users #1-#n, the number of those users being larger than the number of the users that can be processed in the interference cancel processing part. Those demodulation processing parts perform demodulation processing with respect to signals that have been subjected to the interference cancel processing.

Claims

1. A mobile communication system having a radio base station apparatus that effectuates communication with radio mobile station apparatuses, wherein:

said radio base station apparatus comprises;

a signal processing means that receives a multi-wave signal as an input signal, into which spectrum spread codes from a plurality of radio mobile station apparatuses are synthesized, and that performs suppression processing for suppressing interference noise components other than a desired wave in demodulation of a target signal; and

a demodulation processing means for performing demodulation processing on spread signals that have been subjected to the suppression processing with respect to the interference noise components; and

a number of user signals on which said signal processing means can perform signal processing is smaller than a number of user signals that have been subjected to said suppression processing for suppressing the noise components and that can be demodulated by said demodulation processing means.

2. The mobile communication system according to claim 1, wherein:

said signal processing means that suppresses the interference noise components selects a part of the user signals, and uses said selected part of the user signals to suppress the interference noise components.

3. The mobile communication system according to claim 1, wherein:

said radio base station apparatus further comprises synchronous processing means that perform reception synchronous processing based on control information from a control part that gives a selection instruction with respect to each of received user signals for selecting user signals that are to be subjected to signal processing in said signal processing means;

all said synchronous processing means are positioned in an input stage for received signals;

the user signals that are to be subjected to the suppression processing for suppressing the interference noise components are subjected to the synchronous processing before said suppression processing; and

results of the reception synchronous processing on user signals that are not to be subjected to the suppression processing for suppressing the interference noise components are transmitted to said demodulation processing means.

4. The mobile communication system according to claim 3, wherein:

said control part that gives the selection instruction with respect to the user signals selects said user signals that are to be subjected to said suppression processing for suppressing the interference noise components, based on a result of signal processing in a control channel signal processing part, or based on control information that is delivered from an antenna control part controlling an antenna part and that makes selection processing for the received signals possible.

5. The mobile communication system according to claim 3, wherein:

said radio base station apparatus further comprises a selection circuit for selecting user signals, between said synchronous processing means and said signal processing means that performs the suppression processing for suppressing the interference noise components; and

said control part that gives the selection instruction for selecting said user signals receives a result of the synchronous processing in the synchronous processing means with respect to user signals according to the selection instruction, selects again user signals based on the result of the synchronous processing, and controls said selection circuit based on a result of said selection, to select again user signals that are to be subjected to the suppression processing for suppressing the interference noise components.

6. The mobile communication system according to claim 3, wherein:

said radio base station apparatus further comprises a selection circuit for selecting user signals, between said synchronous processing means and said signal processing means that performs the suppression processing for suppressing the interference noise components; and

said control part that gives the selection instruction for selecting said user signals;

selects user signals that are to be subjected to the suppression processing for suppressing the interference noise components, based on information on signal processing in a control channel signal processing part and/or control information that is delivered from an antenna control part controlling an antenna part and that makes selection processing for the received signal possible;

receives the result of the synchronous processing in the synchronous processing means that performs synchronous processing with respect to user signals according to the selection instruction;

selects again user signals based on a result of said synchronous processing, and

controls said selection circuit based on a result of said selection, to select again user signals that are to be subjected to the suppression processing for suppressing the interference noise components.

7. The mobile communication system according to claim 1, wherein:

said radio base station apparatus further comprises a plurality of synchronous processing means that perform reception synchronous processing based on control information from a control part that gives a selection instruction with respect to each of received user signals for selecting user signals that are to be subjected to signal processing in said signal processing means;

out of said plurality of synchronous processing means, synchronous processing means corresponding to the user signals that are to be subjected to the suppression processing for suppressing the interference noise components are positioned in an input stage for received signals;

synchronous processing means corresponding to user signals that are not to be subjected to the suppression processing for suppressing the interference noise components are positioned in a previous stage to said demodulation processing means after the suppression processing of the interference noise components;

the user signals that are to be subjected to the suppression processing for suppressing the interference noise components are subjected to the suppression processing after subjected to the synchronous processing; and

said reception synchronous processing and said demodulation processing are carried out after a part of the user signals are subjected to the suppression processing for suppressing the interference noise components.

8. A radio base station apparatus in a mobile communication system, said radio base station apparatus effectuating communication with radio mobile station apparatuses, wherein:

said radio base station apparatus comprises;

a signal processing means that receives a multi-wave signal as an input signal, into which spectrum spread codes from a plurality of radio mobile station apparatuses are synthesized, and that performs suppression processing for suppressing interference noise components other than a desired wave in demodulation of a target signal; and

a demodulation processing means for performing demodulation processing on spread signals that have been subjected to the suppression processing with respect to the interference noise components; and

a number of user signals on which said signal processing means can perform signal processing is smaller than a number of user signals that have been subjected to said suppression processing for suppressing the noise components and that can be demodulated by said demodulation processing means.

9. The radio base station apparatus according to claim 8, wherein:

said signal processing means that suppresses the interference noise components selects a part of the user signals, and uses said selected part of the user signals to suppress the interference noise components.

10. The radio base station apparatus according to claim 8, wherein:

said radio base station apparatus further comprises synchronous processing means that perform reception synchronous processing based on control information from a control part that gives a selection instruction with respect to each of received user signals for selecting user signals that are to be subjected to signal processing in said signal processing means;

all said synchronous processing means are positioned in an input stage for received signals;

the user signals that are to be subjected to the suppression processing for suppressing the interference noise components are subjected to the synchronous processing before said suppression processing; and

results of the reception synchronous processing on user signals that are not to be subjected to the suppression processing for suppressing the interference noise components are transmitted to said demodulation processing means.

11. The radio base station apparatus according to claim 10, wherein:

said control part that gives the selection instruction with respect to the user signals selects said user signals that are to be subjected to said suppression processing for suppressing the interference noise components, based on a result of signal processing in a control channel signal processing part, or based on control information that is delivered from an antenna control part controlling an antenna part and that makes selection processing for the received signals possible.

12. The radio base station apparatus according to claim 10, wherein:

said radio base station apparatus further comprises a selection circuit for selecting user signals, between said synchronous processing means and said signal processing means that performs the suppression processing for suppressing the interference noise components; and

said control part that gives the selection instruction for selecting said user signals receives a result of the synchronous processing in the synchronous processing means with respect to user signals according to the selection instruction, selects again user signals based on the result of the synchronous processing, and controls said selection circuit based on a result of said selection, to select again user signals that are to be subjected to the suppression processing for suppressing the interference noise components.

13. The radio base station apparatus according to claim 10, wherein:

said radio base station apparatus further comprises a selection circuit for selecting user signals, between said synchronous processing means and said signal processing means that performs the suppression processing for suppressing the interference noise components; and

said control part that gives the selection instruction for selecting said user signals;

selects user signals that are to be subjected to the suppression processing for suppressing the interference noise components, based on information on signal processing in a control channel signal processing part and/or control information that is delivered from an antenna control part controlling an antenna part and that makes selection processing for the received signal possible;

receives the result of the synchronous processing in the synchronous processing means that performs synchronous processing with respect to user signals according to the selection instruction;

selects again user signals based on a result of said synchronous processing, and

controls said selection circuit based on a result of said selection, to select again user signals that are to be subjected to the suppression processing for suppressing the interference noise components.

14. The radio base station apparatus according to claim 8, wherein:

said radio base station apparatus further comprises a plurality of synchronous processing means that perform reception synchronous processing based on control information from a control part that gives a selection instruction with respect to each of received user signals for selecting user signals that are to be subjected to signal processing in said signal processing means;

out of said plurality of synchronous processing means, synchronous processing means corresponding to the user signals that are to be subjected to the suppression processing for suppressing the interference noise components are positioned in an input stage for received signals;

synchronous processing means corresponding to user signals that are not to be subjected to the suppression processing for suppressing the interference noise components are positioned in a previous stage to said demodulation processing means after the suppression processing of the interference noise components;

the user signals that are to be subjected to the suppression processing for suppressing the interference noise components are subjected to the suppression processing after subjected to the synchronous processing; and

said reception synchronous processing and said demodulation processing are carried out after a part of the user signals are subjected to the suppression processing for suppressing the interference noise components.