CDMA CELLULAR WIRELESS COMMUNICATION SYSTEM

• US 20010012283A1
• Filed: 09/22/1997
• Published: 08/09/2001
• Est. Priority Date: 09/22/1997
• Status: Active Grant

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: KATO, OSAMU, MIYA, KAZUYUKI
• Granted Patent: US 6,351,458 B2
• Time in Patent Office: Days
• US Class Current: 370/342
• CPC Class Codes: H04J 13/00 Code division multiplex systems for frequency hopping H04B1/713

Abstract

Wireless communication equipment for a CDMA cellular wireless system operating FDD communication and TDD communication of a simplified circuit structure capable of reducing interference with a communication channel is provided. A wireless transmitter for an SS-DS CDMA cellular wireless system operating FDD communication and TDD communication comprises means 105 for outputting pilot channel signals in an FDD band, means 110 for outputting control channel signals in the FDD band, means 115 for outputting communication channel signals in the FDD band, means 122 for outputting pilot channel signals in a TDD band, and means 127 for outputting communication channel signals in the TDD band, and does not have means for outputting control channel signals in the TDD band. Control channel signals are transmitted only in the FDD band.

Claims

1. A spread spectrum CDMA cellular wireless communication system comprising:

a base station,

a plurality of mobile stations for communicating with the base station,

FDD (Frequency Division Duplex) communication means between the base station and the mobile stations using different radio frequencies for transmission and reception and

TDD (Time Division Duplex) between the base station and the mobile stations using a same frequency for transmission and reception between the base station and the mobile stations.

2. A spread spectrum CDMA cellular wireless communication system according to

claim 1

wherein 90 Mhz between 2110-2200 Mhz and 90 Mhz between 1885-1975 Mhz are each assigned to the FDD communication means and 50 Mhz between 1975-2025 Mhz is assigned to the TDD communication means.

3. A wireless transmitter for a spread spectrum-direct sequence CDMA cellular wireless system operating FDD (Frequency Division Duplex) communication and TDD (Time Division Duplex) communication comprising:

means for outputting pilot channel signals in an FDD band;

means for outputting control channel signals in said FDD band;

means for outputting communication channel signals in said FDD band; and

means for outputting pilot channel signals in a TDD band, wherein said wireless transmitter does not have means for outputting control channel signals in said TDD band.

4. A wireless transmitter for a spread spectrum-direct sequence CDMA cellular wireless system operating a FDD (Frequency Division Duplex) communication band and a TDD (Time Division Duplex) communication band comprising:

means for outputting pilot channel signals in an FDD band;

means for outputting control channel signals in said FDD band;

means for outputting communication channel signals in said FDD band; and

means for outputting pilot channel signals in a TDD band.

5. The CDMA cellular wireless transmitter of

claim 4

further comprising band selection means for allotting communication channel signals of users to either said FDD band or said TDD band when said user connects with the circuit or when the communication is handed over.

6. The CDMA cellular wireless transmitter of

claim 4

further comprising means for interpolating pilot symbols in said communication channel signals outputted in said TDD band, wherein said pilot channel signals outputted in said TDD band is transmitted with lower power than the power with which said communication channel signals are transmitted.

7. The CDMA cellular wireless transmitter of

claim 4

wherein the ratio of chip rates of said signals outputted in said FDD band and said signals outputted in said TDD band is 2^N (N is an integer and N≦

0).

8. The CDMA cellular wireless transmitter of

claim 4

wherein the chip synchronization or the frame synchronization of said signals outputted in said FDD band and said TDD band align with each other.

9. A wireless receiver for a spread spectrum-direct sequence CDMA cellular wireless system operating in a FDD (Frequency Division Duplex) communication band and a TDD (Time Division Duplex) communication band comprising:

means for receiving pilot channel signals in an FDD band;

means for receiving control channel signals in said FDD band;

means for receiving communication channel signals in said FDD band;

means for receiving pilot channel signals in a TDD band; and

means for receiving communication channel signals in said TDD band.

10. The CDMA cellular wireless receiver of

claim 9

further comprising means for carrying out initial synchronization process and process until start of communication with said signals in said FDD band and means for carrying out process during communication and process for ending communication with said signals in said TDD band.

11. The CDMA cellular wireless receiver of

claim 9

further comprising means for intermittently receiving said control channel signals in said FDD band, thereby carrying out waiting process with said signals in said FDD band.

12. Wireless communication apparatus for a spread spectrum-direct sequence CDMA cellular wireless system operating in a FDD (Frequency Division Duplex) communication band and TDD (Time Division Duplex) communication band, a transmitter thereof comprising:

means for outputting pilot channel signals in an FDD band;

means for outputting control channel signals in said FDD band;

means for outputting communication channel signals in said FDD band; and

means for outputting pilot channel signals in a TDD band, and

a receiver thereof comprising;

means for receiving pilot channel signals in said FDD band;

means for receiving control channel signals in said FDD band;

means for receiving communication channel signals in said FDD band;

means for receiving pilot channel signals in said TDD band; and

means for receiving communication channel signals in said TDD band.

13. The CDMA cellular wireless communication apparatus of

claim 12

wherein said transmitter allots communication channel signals of users to either said FDD band or said TDD band when said user connects with the circuit or when the communication is handed over and said receiver receives communication channel signals in either said FDD band or said TDD band designated by said transmitter.

14. The CDMA cellular wireless communication apparatus of

claim 12

wherein said transmitter further comprises means for making said chip synchronization of said signals outputted in said FDD band and said TDD band align with each other before transmission and said receiver further comprises means for carrying out chip synchronization process.

15. The CDMA cellular wireless communication apparatus of

claim 12

wherein said transmitter further comprises means for making said frame synchronization of said signals outputted in said FDD band and said TDD band align with each other before transmission and said receiver further comprises means for carrying out frame synchronization process.

16. The CDMA cellular wireless communication equipment of

claim 12

wherein said transmitter further comprises means for interpolating pilot symbols in said communication channel signals outputted in said TDD band and said receiver further comprises means for carrying out interpolating-type synchronous detection using pilot symbols in receiving communication channel signals.