MODULAR RF FRONT-END FOR ACCESS POINTS AND RADIO HEADS

• US 20200136657A1
• Filed: 10/26/2018
• Published: 04/30/2020
• Est. Priority Date: 10/26/2018
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Anderson, Fred J., Stager, Paul J., Blosco, John M., Zhao, Qing, Kloper, David
• Granted Patent: US 10,735,033 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 1/0028 wherein the AD/DA conversion occurs at baseband stage
• CPC Class Codes: H04B 1/006 using switches for selecting the desired band H04B1/0057 takes precedence
• CPC Class Codes: H04B 1/0096 where a full band is frequency converted into another full band
• CPC Class Codes: H04B 1/1027 assessing signal quality or detecting noise/interference for the received signal
• CPC Class Codes: H04B 1/40 Circuits
• CPC Class Codes: H04B 2001/1063 using a notch filter

Abstract

A wireless communication device is built from a base module and a plurality of front-end modules. Each of the plurality of front-end modules is configured to operate a different one of a plurality of radio frequency services and having a front-end module connector configured to removeably mate with a base module connector of the base module. A particular front-end module is connected to the base module. Upon connection of said particular front-end module to the base module connector, the base module reads information from a memory of said particular front-end module to determine the radio service that the particular front-end module is configured to operate and to supply the control signals to configure and control front-end circuitry of the front-end module to operate the radio service.

Claims

1. An apparatus comprising:

a base module and a plurality of front-end modules;

each of the plurality of front-end modules being configured to operate a different one of a plurality of radio frequency services, each front-end module including;

one or more antennas;

front-end circuitry;

a memory configured to store information indicating which one of the plurality of radio frequency services the front-end module is configured to operate; and

a front-end module connector coupled to the front-end circuitry and to the memory;

the base module including;

a modem configured to perform baseband modulation of transmit data to generate baseband modulated transmit data and baseband demodulation of received baseband modulated data to recover receive data;

one or more radio transceivers coupled to the modem and configured to upconvert the baseband modulated transmit data to produce radio frequency (RF) transmit signals for transmission and to downconvert RF received signals to obtain the received baseband modulated data, the one or more radio transceivers having a universal frequency band coverage spanning frequency bands of operation of the plurality of front-end modules;

a base module connector configured to mate with the front-end module connector of any one of the plurality of front-end modules, the base module connector configured to supply the RF transmit signals to, and to receive the RF received signals from, a particular front-end module of the plurality of front-end modules that is connected to the base module connector, the base module connector further configured to supply power and control signals from the base module to said particular front-end module; and

a processor configured to communicate via the base module connector with said particular front-end module that is connected to the base module connector, wherein upon connection of said particular front-end module to the base module connector, the processor is configured to read the information from the memory of said particular front-end module to determine a radio service that the particular front-end module is configured to operate and to supply the control signals to configure and control the front-end circuitry to operate the radio service.

2. The apparatus of claim 1, wherein the front-end circuitry includes one or more receive amplifiers, one or more transmit amplifiers and one or more bias control circuits that set bias, and control operation, of the one or more receive amplifiers and the one or more transmit amplifiers, wherein the control signals supplied by the base module are coupled to the one or more bias control circuits.

3. The apparatus of claim 2, wherein the front-end circuitry of said particular front-end module further includes one or more transmit/receive switches configured to connect the one or more transmit amplifiers to the one or more antennas during a transmit mode and to connect the one or more receive amplifiers to the one or more antennas during a receive mode, and wherein the processor of the base module is configured to supply transmit/receive control signals via the base module connector to said particular front-end module to control the one or more transmit/receive switches.

4. The apparatus of claim 1, wherein the processor of the base module is configured to determine, from the information read from the memory of the particular front-end module, one or more of:

number of antennas, frequency band(s) of operation for the radio service, antenna path calibration, regulatory limitations if any, gain of antennas if any.

5. The apparatus of claim 1, wherein the front-end circuitry of said particular front-end module further includes one or more bandpass filters, and wherein the processor of the base module is configured to supply filter control signals via the base module connector to said particular front-end module to control the one or more bandpass filters to pass a particular frequency band.

6. The apparatus of claim 5, wherein respective ones of the plurality of front-end modules are configured to operate a radio service in a respective different radio frequency band.

7. The apparatus of claim 1, wherein one of the plurality of front-end modules comprises a cable tether connected between the front-end module connector and a housing that contains the front-end circuitry, and wherein the one or more antennas are external antennas attached the housing or conformal antennas internal to or on an exterior of the housing so that the one or more antennas are remote from the base module when the front-end module connector is connected to the base module connector.

8. The apparatus of claim 1, wherein the one or more radio transceivers are implemented on one or more integrated circuits.

9. The apparatus of claim 1, wherein functions of the one or more radio transceivers are implemented by a RF sampling transceiver digital signal processor that performs RF upconversion from baseband to RF to produce the RF transmit signals and downconversion from RF to baseband to produce the received baseband modulated data, and digital-to-analog conversion for the RF transmit signals and analog-to-digital conversion for the received baseband modulated data.

10. A method for configuring a communication device, the method comprising:

providing a base module and a plurality of front-end modules, each of the plurality of front-end modules being configured to operate a different one of a plurality of radio services and having a front-end module connector configured to removeably mate with a base module connector of the base module;

connecting a particular front-end module to the base module; and

upon connection of said particular front-end module to the base module connector, the base module reading information from a memory of said particular front-end module to determine a radio service that the particular front-end module is configured to operate and to supply control signals to configure and control front-end circuitry of the particular front-end module to operate the radio service.

11. The method of claim 10, wherein the control signals supplied by the base module are coupled to one or more bias control circuits of the particular front-end module to set bias of and control an operation of one or more receive amplifiers and one or more transmit amplifiers of the particular front-end module.

12. The method of claim 11, wherein the control signals include transmit/receive control signals supplied to one or more transmit/receive switches to connect the one or more transmit amplifiers to one or more antennas during transmit mode and to connect the one or more receive amplifiers to the one or more antennas during receive mode.

13. The method of claim 10, further comprising the base module determining, from the information read from the memory of the particular front-end module, one or more of:

number of antennas, frequency band(s) of operation for a radio service from among the plurality of radio services, antenna path calibration, regulatory limitations if any, gain of antennas if any.

14. The method claim 10, further comprising the base module controlling operation of a modem and one or more radio transceivers of the base module according to a radio service from among the plurality of radio services determined for said particular front-end module.

15. The method of claim 10, further comprising the base module operating one or more radio transceivers that have a universal frequency band coverage spanning frequency bands of the plurality of front-end modules.

16. An apparatus comprising:

front-end circuitry;

a memory configured to store information indicating which one of a plurality of radio services the front-end circuitry is configured to operate; and

a connector coupled to the front-end circuitry and to the memory,

wherein the front-end circuitry is responsive to, and controlled by control signals received from a base module that removeably connects to the connector, the control signals being generated by the base module based on the information read by the base module from the memory when the base module is connected to the connector,

wherein the front-end circuitry includes one or more receive amplifiers, one or more transmit amplifiers and one or more bias control circuits that set bias of and control an operation of the one or more receive amplifiers and the one or more transmit amplifiers, and

wherein the control signals supplied by the base module are coupled to the one or more bias control circuits.

18. The apparatus of claim 16, wherein the front-end circuitry further includes one or more transmit/receive switches configured to connect the one or more transmit amplifiers to one or more antennas during a transmit mode and to connect the one or more receive amplifiers to the one or more antennas during a receive mode, and wherein the control signals include transmit/receive control signals to control the one or more transmit/receive switches.

19. The apparatus of claim 18, wherein the front-end circuitry further includes one or more filters, and wherein the control signals control the one or more filters, and wherein the one or more filters are bandpass filters that are configurable to pass a particular frequency band.

17. (canceled)

20. An apparatus comprising:

front-end circuitry;

a memory configured to store information indicating which one of a plurality of radio services the front-end circuitry is configured to operate; and

a connector coupled to the front-end circuitry and to the memory,

wherein the front-end circuitry is responsive to, and controlled by control signals received from a base module that removeably connects to the connector, the control signals being generated by the base module based on the information read by the base module from the memory when the base module is connected to the connector, and

wherein the front-end circuitry is configured to operate in conjunction with one or more radio transceivers in the base module that have a universal frequency band coverage spanning frequency bands in which the plurality of radio services operate.

21. The apparatus of claim 20, wherein the connector is a mating connector that removeably mates with the base module.