CDMA cellular wireless communication system

• US 6,351,458 B2
• Filed: 09/22/1997
• Issued: 02/26/2002
• Est. Priority Date: 09/22/1997
• Status: Expired due to Fees

• 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
• Primary Examiner(s): YAO, KWANG BIN
• Application Number:
  US08/934,978
• Publication Number:
  US 20010012283A1
• Time in Patent Office: 1,618 Days
• Field of Search: 370/276, 370/277, 370/278, 370/279, 370/280, 370/281, 370/294, 370/295, 370/315, 370/319, 370/320, 370/321, 370/324, 370/328, 370/329, 370/330, 370/331, 370/335, 370/336, 370/342, 370/343, 370/345, 370/350, 375/140, 375/146, 375/147
• US Class Current: 370/330
• 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 reduces interference with a communication channel. A wireless transmitter for an SS-DS CDMA cellular wireless system operating FDD communications and TDD communications includes an FDD pilot channel for outputting pilot channel signals in an FDD band, an FDD control channel for outputting control channel signals in the FDD band, FDD communications channels for outputting communications channel signals in the FDD band, a TDD pilot channel for outputting pilot channel signals in a TDD band, and a TDD communications channel for outputting communication channel signals in the TDD band. The wireless transmitter does not have a TDD control channel for outputting control channel signals in the TDD band. Control channel signals are transmitted only in the FDD band.

Claims

1. 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, said transmitter comprising:

means for outputting pilot channel signals in an FDD band;

means for outputting control channel signals in said FDD band, wherein said control channel signals are common to both of said FDD band and TDD band;

means for outputting communication channel signals in said FDD band;

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

means for outputting communication channel signals in said TDD band;

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

2. 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;

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

means for outputting communication channel signals in said TDD band;

wherein said control channel signals are common in both of FDD band and TDD band.

3. The CDMA cellular wireless transmitter of claim 2 further comprising band selection means for alloting communication channel signals of a user to either said FDD band or said TDD band when said user connects with said transmitter or when communication is handed over.

4. The CDMA cellular wireless transmitter of claim 2 wherein the chip synchronization or the frame synchronization of said signals outputted in said FDD band and said TDD band align with each other.

5. A spread spectrum CDMA cellular wireless communication system according to claim 2, wherein 90 MHz between 2110-2200 MHz and 90 MHz between 1885-1975 MHz are each assigned to the FDD communication band and 50 MHz between 1975-2025 MHz is assigned to the TDD communication band.

6. 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, said transmitter 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;

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

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 are transmitted with lower power than the power with which said communication channel signals are transmitted.

7. 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;

wherein the ratio of chip rates of said signals outputted in said FDD band and said signals outputted in said TDD band align with each other.

8. A wireless receiver 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 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;

wherein said control channel signals are common in both the FDD band and TDD band.

9. The CDMA cellular wireless receiver of claim 8 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.

10. The CDMA cellular wireless receiver of claim 8 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.

11. Wireless communication apparatus 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, said apparatus comprising:

(a) a transmitter 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 said TDD band,

wherein said control channel signals are common in both the FDD band and TDD band; and

(b) a receiver 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,

wherein said control signals are common in both the FDD band and TDD band.

12. The CDMA cellular wireless communication apparatus of claim 11 wherein said transmitter allots communication channel signals of a user to either said FDD band or said TDD band when said user connects with said apparatus or when communication is handed over and said receiver receives communication channel signals in either said FDD band or said TDD band designated by said transmitter.

13. The CDMA cellular wireless communication apparatus of claim 11 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.

14. The CDMA cellular wireless communication apparatus of claim 11 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.

15. A wireless communication apparatus for a spread spectrum-direct sequence CDMA cellular wireless system operating in an 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 an FDD band;

means for outputting communication channel signals in an 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,

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.

16. A wireless receiver 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, said receiver 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 communication channel signals having pilot symbols interpolated therein in a TDD band; and

means for receiving pilot channel signals in said TDD band, wherein said pilot channel signals in said TDD band have lower transmission power than the transmission power of said communication channel signals.

17. A wireless receiver 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, said receiver 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 having pilot symbols interpolated therein in said FDD band; and

means for receiving pilot channel signaLS in a TDD band;

wherein the ratio of chip rates of said signals in said FDD band and said signals of said TDD band align with each other.