Transmission rate control method for avoiding interference in radio communications

• US 6,044,067 A
• Filed: 08/18/1997
• Issued: 03/28/2000
• Est. Priority Date: 08/23/1996
• Status: Expired due to Term

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Suzuki, Mitsuhiro
• Primary Examiner(s): Nguyen, Chau
• Assistant Examiner(s): Nguyen, Phuongchau Ba
• Application Number:
  US08/912,780
• Time in Patent Office: 953 Days
• Field of Search: 370/252, 370/465, 370/468, 370/242, 370/342, 370/331, 370/335, 370/477, 370/330, 455/63, 455/422, 455/423, 455/424, 455/517, 455/450
• US Class Current: 370/252
• CPC Class Codes: H04B 1/715 Interference-related aspects
• CPC Class Codes: H04B 2001/7154 with means for preventing interference
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0033 each allocating device acting autonomously, i.e. without negotiation with other allocating devices
• CPC Class Codes: H04L 5/0039 Frequency-contiguous, i.e. with no allocation of frequencies for one user or terminal between the frequencies allocated to another
• CPC Class Codes: H04L 5/0046 Determination of how many bits are transmitted on different sub-channels
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04W 52/244 Interferences in heterogeneous networks, e.g. among macro and femto or pico cells or other sector / system interference [OSI]

Abstract

A communication apparatus includes an RF signal processing circuit for processing a received RF signal, an RF demodulating circuit for demodulating an output signal of the RF signal processing circuit, a decoding circuit for decoding an output signal from the RF demodulating circuit, an encoding circuit for encoding a predetermined information signal, an RF modulating circuit for modulating an output signal from the encoding circuit, and a transmission signal processing circuit for processing an output signal from the RF modulating circuit. The encoding circuit includes a memory for storing predetermined control data, a selecting circuit for selecting the predetermined control data in accordance with an information of circuit quality obtained from the decoding circuit, and an adding circuit for adding the transmission data with an output of the selecting circuit. An output power of the transmission signal processing circuit is controlled by the information of the circuit quality.

Claims

1. A communication method in a predetermined bandwidth with a predetermined format for multiple access by each cell, comprising the steps of:

detecting an interference by a base station of another cell of a communication between a first apparatus and a second apparatus;

sending one of an information that said interference is detected in said detecting step and an information that existence of said interference is unknown to said first or said second apparatus, wherein a processing in said sending step is carried out through a radio communication among a plurality of base stations; and

lowering an information transmission rate of said communication between said first and said second apparatus in response to said information sent by said step of sending.

2. The communication method according to claim 1, wherein a common frequency band for communication is employed in a cell where said first apparatus belongs and a cell where said third apparatus belongs.

3. The communication method according to claim 2, wherein said predetermined format employs a multicarrier signal formed by a unit which includes subcarriers of a predetermined number and time slots of said predetermined number.

4. The communication method according to claim 2, wherein said predetermined format is a code division multiple access format.

5. The communication method according to claim 1, wherein said predetermined format employs a multicarrier signal formed by a unit which includes subcarriers of a predetermined number and time slots of said predetermined number.

6. The communication method according to claim 4, wherein said predetermined format is a code division multiple access format.

7. The communication method according to claim 1, wherein a processing in said lowering step is carried out by lowering said information transmission rate in a communication path between said first and said second apparatus without varying a capacity of said communication path.

8. The communication method according to claim 1, wherein a processing in said lowering step is carried out by lowering said information transmission rate per unit of communication path between said first and said second apparatus while increasing a capacity of said path.

9. The communication method according to claim 1, wherein a processing in said lowering step is carried out by lowering said information transmission rate per unit of communication path between said first and said second apparatus while increasing a capacity of said path.

10. A communication method in a predetermined bandwidth with a predetermined format for multiple access by each cell, comprising the steps of:

detecting an interference by a second base station when a first base station is communicating with a subscriber in a cell, where said first base station is located and said subscriber is located at an edge of said cell and is approaching a cell where said second base station is located; and

lowering an information transmission rate of said communication between said first base station and said subscriber in response to information detected from said step of detecting, wherein said information is sent by said second base station to one of said first base station and said subscriber.

11. The communication method according to claim 10, wherein a common frequency band for communication is employed in a cell where said first base station belongs and a cell where said second base station belongs.

12. The communication method according to claim 10, wherein a processing in said lowering step is carried out by lowering said information transmission rate in a communication path between said first and said second apparatus without varying a capacity of said communication path.

13. A communication apparatus for communicating in a predetermined bandwith with a predetermined format for multiple access by each cell, comprising:

communicating means for communicating with a predetermined station;

information receiving means for receiving a predetermined communication status information from a third station; and

rate adjusting means for lowering an information transmission rate of said communication apparatus and said predetermined station when an output signal from said information receiving means indicates that said communication status of said third station is one of a status having a level lower than a predetermined value and an unknown status.

14. The communication apparatus according to claim 13, wherein said third station is a base station of another cell, and said communication status information is transmitted by wire communication.

15. The communication apparatus according to claim 13, wherein a common frequency band for communication is employed in a cell where said predetermined station belongs and a cell where said third station belongs.

16. The communication apparatus according to claim 13, wherein said predetermined format employs a multicarrier signal formed by a unit which includes subcarriers of a predetermined number and said time slots of a predetermined number.

17. The communication method according to claim 13, wherein said predetermined format is a code division multiple access format.

18. The communication apparatus according to claim 13, wherein a processing in said lowering step is carried out by lowering said information transmission rate in a communication path between said first and said second apparatus without varying a capacity of said communication path.

19. The communication apparatus according to claim 13, wherein a processing in said lowering step is carried out by lowering said information transmission rate per unit of communication path between said first and said second apparatus while increasing a capacity of said path.

21. The communication apparatus according to claim 13, wherein a common frequency band for communication is employed in a cell where said predetermined station belongs and a cell where said third station belongs.

20. A communication apparatus for communicating in a predetermined bandwith with a predetermined format for multiple access by each cell, comprising:

communicating means for communicating with a predetermined station;

information receiving means for receiving a predetermined communication status information from a third station; and

rate adjusting means for lowering an information transmission rate of said communication when an output signal from said communication apparatus indicates that said communication apparatus is located at an edge of a cell where said predetermined station is located and when an output signal from said information receiving means indicates that said communication apparatus is approaching a cell where said third station is located.

22. The communication apparatus according to claim 20, wherein said predetermined format employs a multicarrier signal formed by a unit which includes subcarriers of a predetermined number and time slots of said predetermined number.

23. The communication method according to claim 20, wherein said predetermined format is a code division multiple access format.

24. The communication apparatus according to claim 20, wherein a processing in said lowering step is carried out by lowering said information transmission rate in a communication path between said first and said second apparatus without varying a capacity of said communication path.

25. The communication apparatus according to claim 20, wherein a processing in said lowering step is carried out by lowering said information transmission rate per unit of communication path between said first and said second apparatus while increasing a capacity of said path.