Wireless communication device with frequency planning for spur avoidance under coexistence of multiple wireless communication systems

• US 10,637,518 B2
• Filed: 01/01/2019
• Issued: 04/28/2020
• Est. Priority Date: 01/30/2018
• Status: Active Grant

• Current Assignee: MediaTek, Inc.
• Original Assignee: MediaTek, Inc.
• Inventors: Tseng, Sheng-Che, Hsieh, Yu-Lin, Hsieh, Ming-Yu, Yen, Shih-Chieh, Tsai, Jen-Kuei
• Primary Examiner(s): Akinyemi, Ajibola A
• Application Number:
  US16/237,740
• Publication Number:
  US 20190238167A1
• Time in Patent Office: 483 Days
• Field of Search: 455118
• CPC Class Codes: H04B 1/0475 with means for limiting noise, interference or distortion H04B1/0483 takes precedence
• CPC Class Codes: H04B 1/30 for homodyne or synchrodyne receivers demodulator circuits H03D1/22
• CPC Class Codes: H04B 1/525 with means for reducing leakage of transmitter signal into the receiver
• CPC Class Codes: H04B 2001/0491 with frequency synthesizers, frequency converters or modulators
• CPC Class Codes: H04B 2001/307 using n-port mixer
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Abstract

A wireless communication device includes a first wireless communication system and a second wireless communication system. Regarding the first wireless communication system, an up-conversion circuit up-converts a first transmit (TX) signal in a baseband to generate a second TX signal with a first carrier frequency, and a front-end circuit transmits the second TX signal to another wireless communication device. Regarding the second wireless communication system, a first down-conversion circuit down-converts a first receive (RX) signal with a second carrier frequency to generate a second RX signal with a third carrier frequency, and a second down-conversion circuit down-converts the second RX signal with the third carrier frequency to generate a third RX signal in the baseband. The third carrier frequency is different from all fundamental frequencies included in a band combination that is employed at the first wireless communication system and is supported by another wireless communication device.

Claims

1. A wireless communication device with coexistence of multiple wireless communication systems comprising:

a first wireless communication system, comprising;

an up-conversion circuit, arranged to up-convert a first transmit (TX) signal in a baseband to generate a second TX signal with a first carrier frequency; and

a front-end circuit, arranged to transmit the second TX signal to another wireless communication device, wherein the first carrier frequency is within a band combination that is employed at the first wireless communication system and is supported by said another wireless communication device; and

a second wireless communication system, comprising;

a first down-conversion circuit, arranged to down-convert a first receive (RX) signal with a second carrier frequency to generate a second RX signal with a third carrier frequency; and

a second down-conversion circuit, arranged to down-convert the second RX signal with the third carrier frequency to generate a third RX signal in the baseband;

wherein the third carrier frequency is different from all fundamental frequencies included in the band combination; and

the wireless communication device has pre-defined frequency planning that ensures the third carrier frequency is not a selectable fundamental frequency at the first wireless communication system, such that the up-conversion circuit outputs no TX signal with the third carrier frequency.

2. The wireless communication device of claim 1, wherein the first wireless communication system is a 4G Long Term Evolution (LTE) system, and the second wireless communication system is a 5G New Radio (NR) Millimeter Wave (mmWave) system.

3. The wireless communication device of claim 2, wherein the third carrier frequency is within a frequency range that is between 7.4 GHz and 8.2 GHz.

4. The wireless communication device of claim 2, wherein the third carrier frequency is within a frequency range that is between 4.2 GHz and 5 GHz.

5. The wireless communication device of claim 2, wherein the third carrier frequency is within a frequency range that is between 6 GHz and 6.8 GHz.

6. The wireless communication device of claim 1, wherein the first wireless communication system is a 5G New Radio (NR) Sub-6 GHz system, and the second wireless communication system is a 5G NR Millimeter Wave (mmWave) system.

7. The wireless communication device of claim 6, wherein the third carrier frequency is within a frequency range that is between 7.4 GHz and 8.2 GHz.

8. The wireless communication device of claim 6, wherein the third carrier frequency is within a frequency range that is between 4.2 GHz and 5 GHz.

9. The wireless communication device of claim 6, wherein the third carrier frequency is within a frequency range that is between 6 GHz and 6.8 GHz.

10. The wireless communication device of claim 1, wherein the wireless communication device is a user equipment (UE).

11. A wireless communication device with coexistence of multiple wireless communication systems comprising:

a first wireless communication system, comprising;

a front-end circuit, arranged to receive a first receive (RX) signal with a first carrier frequency from another wireless communication device, wherein the first carrier frequency is within a band combination that is employed at the first wireless communication system and is supported by said another wireless communication device; and

a down-conversion circuit, arranged to down-convert the first RX signal with the first carrier frequency to generate a second RX signal in a baseband; and

a second wireless communication system, comprising;

a first up-conversion circuit, arranged to up-convert a first transmit (TX) signal in the baseband to generate a second TX signal with a second carrier frequency; and

a second up-conversion circuit, arranged to up-convert the second TX signal with the second carrier frequency to generate a third TX signal with a third carrier frequency;

wherein the second carrier frequency is different from all fundamental frequencies included in the band combination; and

the wireless communication device has pre-defined frequency planning that ensures the second carrier frequency is not a selectable fundamental frequency at the first wireless communication system, such that the down-conversion circuit receives no RX signal with the second carrier frequency.

12. The wireless communication device of claim 11, wherein the first wireless communication system is a 4G Long Term Evolution (LTE) system, and the second wireless communication system is a 5G New Radio (NR) Millimeter Wave (mmWave) system.

13. The wireless communication device of claim 12, wherein the second carrier frequency is within a frequency range that is between 7.4 GHz and 8.2 GHz.

14. The wireless communication device of claim 12, wherein the second carrier frequency is within a frequency range that is between 4.2 GHz and 5 GHz.

15. The wireless communication device of claim 12, wherein the second carrier frequency is within a frequency range that is between 6 GHz and 6.8 GHz.

16. The wireless communication device of claim 11, wherein the first wireless communication system is a 5G New Radio (NR) Sub-6 GHz system, and the second wireless communication system is a 5G NR Millimeter Wave (mmWave) system.

17. The wireless communication device of claim 16, wherein the second carrier frequency is within a frequency range that is between 7.4 GHz and 8.2 GHz.

18. The wireless communication device of claim 16, wherein the second carrier frequency is within a frequency range that is between 4.2 GHz and 5 GHz.

19. The wireless communication device of claim 16, wherein the second carrier frequency is within a frequency range that is between 6 GHz and 6.8 GHz.

20. The wireless communication device of claim 11, wherein the wireless communication device is a user equipment (UE).