Apparatus method and computer program for radio-frequency path selection and tuning

• US 20090285135A1
• Filed: 05/19/2008
• Published: 11/19/2009
• Est. Priority Date: 05/19/2008
• Status: Active Grant

• Current Assignee: Nokia Technologies Oy (Nokia Corporation)
• Original Assignee: Nokia Corporation
• Inventors: Rousu, Seppo O., Leinonen, Marko E., Valtanen, Juha P.
• Granted Patent: US 8,320,842 B2
• Time in Patent Office: Days
• US Class Current: 370/297
• CPC Class Codes: H04B 1/0057 using diplexing or multiplexing filters for selecting the desired band

Abstract

An apparatus includes a tunable diplexer; first, second and third radio nodes; and path selection circuitry. The tunable diplexer includes a dedicated port, at least a first signal port and a second signal port, and control inputs configured to change at least one of frequency characteristics and phase characteristics of the tunable diplexer. The path selection circuitry is configurable to select between a first signal pathway between the third radio node and the first signal port and a second signal pathway between the third radio node and the second signal port. The tunable diplexer may have control signals inputs to select between the first and second signal pathways based on an expected interference scenario between radio signals at the first and second signal ports, and the control signals may change frequency characteristics and/or phase characteristics of at least one of the signal ports based on an operational condition of the apparatus.

Claims

1. An apparatus comprising:

a tunable diplexer comprising a dedicated port, at least a first signal port and a second signal port, and control inputs configured to change at least one of frequency characteristics and phase characteristics of the tunable diplexer;

a first radio node, a second radio node and a third radio node; and

path selection circuitry configurable to select between a first signal pathway between the third radio node and the first signal port and a second signal pathway between the third radio node and the second signal port.

2. The apparatus of claim 1, further comprising a controller configured to send control signals to the control inputs so as to select between the first signal pathway and the second signal pathway based on an expected interference scenario between radio signals at the first signal port and the second signal port.

3. The apparatus of claim 2, further comprising a first radio coupled to the first radio node, a second radio coupled to the second radio node, and a third radio coupled to the third radio node, wherein the control signals select between the first signal pathway and the second signal pathway based on frequency characteristics of at least the first radio or the second radio.

4. The apparatus of claim 2, wherein the control inputs are configured to change the at least one frequency characteristics and phase characteristics at least one of the signal ports based on at least one of the following operational conditions of the apparatus:

an operational frequency of a transmission or reception of a first radio coupled to the first radio node, an operational frequency of a transmission or reception of a second radio coupled to the second radio node, a power level of a received signal, a quality level of a received signal, a used modulation method, harmonic frequencies generated by radio blocks coupled to at least one of the radio nodes, harmonic power level generated from a radio block coupled to at least one of the radio nodes, wide band noise level at frequencies generated by radio blocks coupled to the radio nodes, timings of receptions and transmissions of a radio coupled to a radio node, a number of sub-carriers of a reception or transmission, operational temperature of the apparatus, ambient temperature of the apparatus, data rates of a signal passing through the diplexer, and expected interference signal level.

5. The apparatus of claim 2, wherein the control signals from the processor are based at least in part on at least one of:

temperature information from a sensor of the apparatus, total radiated power performance, and total radiated sensitivity performance

6. The apparatus of claim 1, wherein the dedicated port is configured to couple to a first antenna and the tunable diplexer further comprises a second dedicated port configured to couple to a second antenna.

7. The apparatus of claim 6, further comprising power detection circuitry adapted to adjust a power division ratio between the dedicated ports.

8. The apparatus of claim 1, wherein the path selection circuitry is configurable to select between a first configuration in which the first signal pathway is between the third radio node and the first signal port and a third signal pathway that is between the second radio node and the second signal port;

and a second configuration in which the second signal pathway is between the third radio and the second signal port and a fourth signal pathway that is between the first radio node and the first signal port.

9. The apparatus of claim 1, further comprising a first radio, a second radio and a third radio respectively coupled to the first radio node, the second radio node and the third radio node such that any pair of the first, second and third radios may be simultaneously coupled along an active signal path to the respective first signal port and the second signal port, and further wherein a single antenna is coupled to the dedicated port.

10. The apparatus of claim 1, wherein the path selection circuitry comprises:

a first diplexer coupled to the first signal port and adapted to select between a first radio branch that goes between the third radio node and the first signal port and a second radio branch that goes between the third radio node and the second signal port.

11. The apparatus of claim 10, wherein the path selection circuitry further comprises:

a second diplexer along the first radio branch that selectively couples the first radio node to the first signal port based on control signals received at a control input of the second diplexer; and

a third diplexer along the second radio branch that selectively couples the second radio node to the second signal port based on control signals received at a control input of the third diplexer.

12. The apparatus of claim 1, further comprising an antenna port coupled to the dedicated port of the tunable diplexer.

13. The apparatus of claim 12, further comprising an additional antenna port coupled to at least one of the first, second or third radio nodes.

14. The apparatus of claim 1, further comprising a controller having control outputs coupled to the control inputs, the processor configured to power down unused radio blocks coupled to the path selection circuitry based on control signals sent over the control outputs.

15. The apparatus of claim 14, the apparatus comprising a portable multi-radio device.

16. The apparatus of claim 1 comprising an integrated circuit.

17. A method comprising:

determining an expected interference scenario between radios of a multiradio device;

based on the expected interference scenario, sending a control signal that changes at least one of frequency characteristics and phase characteristics of a tunable diplexer so as to couple a third radio of the radios to a first signal port of the tunable diplexer via a first signal pathway or to a second signal port of the tunable diplexer via a second signal pathway.

18. The method of claim 17, wherein the control signal is selected based at least on expected frequency interference of the third radio with one of a first radio or a second radio of the multi-radio device.

19. The method of claim 18, wherein the control signal is selected based at least in part on at least one of:

temperature, total radiated power performance, and total radiated sensitivity performance.

20. The method of claim 19, for a first expected interference scenario the control signal selects a first circuit configuration in which the first signal pathway is active between the third radio and the first signal port and a third signal pathway is active between a second radio and the second signal port;

and

for a second expected interference scenario the control signal selects a second circuit configuration in which the second signal pathway is active between the third radio and the second signal port and a fourth signal pathway is active between a first radio and the first signal port.

21. The method of claim 19, wherein the control signal operates to change at least one of the frequency characteristics and the phase characteristics of the tunable diplexer such that any pair of a first, second and third radios may be simultaneously coupled along an active signal path to the respective first signal port and the second signal port.

22. The method of claim 21, further wherein additional control signals dependent upon the expected interference scenario are selected and sent to additional diplexers so as to select at least any pair of radios from among a plurality of five radios to couple to the first and second signal ports.

23. The method of claim 22, further comprising powering down unused radios based on the control signals.

24. A computer readable medium that stores a program of computer instructions that when executed by a digital processor result in actions directed to selecting a signal pathway for radios of a multi-radio device, the actions comprising:

determining an expected interference scenario between radios of a multiradio device;

based on the expected interference scenario, sending a control signal that changes at least one of frequency characteristics and phase characteristics of a tunable diplexer so as to couple a third radio of the radios to a first signal port of the tunable diplexer via a first signal pathway or to a second signal port of the tunable diplexer via a second signal pathway.

25. A device comprising:

adjustable switching means for changing at least one of frequency characteristics and phase characteristics of the adjustable switching means, the adjustable switching means comprising at least a dedicated port and a first signal port and a second signal port and control input means;

a first radio node, a second radio node and a third radio node; and

path selection means for selectively activating a first signal pathway between the third radio node and the first signal port and a second signal pathway between the third radio node and the second signal port.