Apparatus and method for automated band selection via synthesizer bit insertion

• US 6,708,044 B1
• Filed: 04/04/2000
• Issued: 03/16/2004
• Est. Priority Date: 04/04/2000
• Status: Expired due to Fees

• Current Assignee: NEC Corporation of America (NEC Corporation)
• Original Assignee: NEC America Inc (NEC Corporation)
• Inventors: Zhang, Dongan, Patel, Mukesh, Puknat, William
• Primary Examiner(s): Trinh, Sonny
• Application Number:
  US09/542,188
• Time in Patent Office: 1,442 Days
• Field of Search: 455/76, 455/73, 455/75, 455/552.1, 455/550.1, 455/180.1, 455/432.1, 455/422.1, 455/464, 455/436, 455/437, 455/553.1, 455/426.1, 455/83, 370/337, 370/321, 370/335, 370/342, 370/347, 370/442, 375/267, 375/299, 375/347
• US Class Current: 455/552.1
• CPC Class Codes: H04B 1/005 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
• CPC Class Codes: H04B 1/406 with more than one transmission mode, e.g. analog and digital modes

Abstract

A method and apparatus for providing time-critical band selection in a communication device with dual band or multi-band switching, or, alternatively, for providing dual mode or multi-mode time critical operating ability. The mobile station typically has a transmitter section and a receiver section each capable of dual modes of operation, a frequency synthesizer and a controller. The band to band operating method utilizes a frequency command data signal where data derived from the signal is used in a determinable bit stream of data including a frequency data word. The frequency data word is used for defining an operational state of the synthesizer frequency thereby implementing the transceiver'"'"'s operating channel. At least one bit (or functional bits) from within the bit stream or received signal is used for defining, at least momentarily, the transceiver'"'"'s “new” operating band (or state). The functional bits can also be used to effectuate other time critical operations of the mobile station, including band to band switching operations (such as MAHO) over two distinct frequency bands; or, one or more can be used to switch or enable control circuits or functions or operations which are time limited or time constrained or which implicate time critical operations of the communication device or apparatus.

Claims

1. A method for providing band selection in a communication apparatus with band to band operating capability, the communication apparatus including a receiver section, a transmitter section, a frequency synthesizer and a controller, the method comprising:

receiving a frequency command data signal, the frequency command data signal used for deriving a bit stream, the bit stream including a frequency data word defining a synthesizer operating frequency and at least one functional bit for specifying a mode of operation;

extracting the functional bit from the bit stream to generate an operational signal;

providing the operational signal to the receiver section to modify operation thereof; and

,

utilizing the frequency data word to further modify operation of the communication apparatus.

2. The method of claim 1, further comprising the steps of:

providing a latch signal from the controller for latching the functional bit;

further utilizing the frequency data word by the controller for generating at least one data signal; and

providing the data signal to the frequency synthesizer to effect operation thereof.

3. The method of claim 1, wherein the step of extracting includes holding the functional bit for at least the time the controller utilizes to implement a functionally similar condition within the receiver section.

4. The method of claim 1, wherein the step of extracting includes holding the functional bit for at least the time the controller utilizes to evaluate the frequency command data signal and implement the operational state defined by the functional bit.

5. The method of claim 1, wherein the step of extracting includes holding the functional bit for at least the time the controller utilizes to evaluate the frequency command data signal and implement the operational state defined by the frequency command data signal.

6. The method of claim 1, wherein the step of utilizing the frequency data word by the controller includes coupling the controller to a digital signal processor programmed with a set of computer instructions for evaluating the frequency command data signal.

7. The method of claim 1, wherein the step of utilizing the frequency data word includes coupling the controller to a logic circuit for controlling operation of the communication apparatus.

8. The method of claim 7, wherein the logic circuit includes circuitry of an application specific integrated circuit (ASIC).

9. A communication apparatus including:

a receiver section for receiving a command signal wherein the command signal includes a data stream of bits for commanding the operation of a portion of the communication apparatus;

a transmitter section for transmitting an output signal in a predetermined transmit format;

a controller for controlling the operation within the communication apparatus and which is responsive to certain data within the data stream;

a latching circuit responsive to the controller for capturing within a latch device a portion of the data of the data stream; and

,

a selecting circuit responsive to the data portion captured by the latching circuit, and wherein the selecting circuit is responsive to the data portion captured prior to a similar operation by the controller.

10. The communication apparatus of claim 9, wherein the selecting circuit includes circuitry implemented in an application specific integrated circuit (ASIC).

11. The communication apparatus of claim 9, wherein the selecting circuit includes a switch responsive to the data portion and which enables at least a part of the receiver section.

12. The communication apparatus of claim 9, wherein the selecting circuit includes a switch responsive to the data portion and which switches the receiver from a first signal path to a second signal path.

13. The communication apparatus of claim 12, wherein the switch responsive to the data portion operates prior to a similar functional operation of the controller.

14. A circuit for implementing first band to second band selection in a communication apparatus, the communication apparatus including:

an input/output circuit including a latch circuit for receiving a portion of a frequency command data signal, wherein a bit or bits derived from the frequency command data signal are used for specifying an operational band;

a receiver connected to the input/output and the latch circuits;

a transmitter connected to the input/output and latch circuits; and

,

a frequency synthesizer connected to a controller, the receiver, and the transmitter, wherein the frequency synthesizer is responsive to data derived from the portion of the frequency command data signal, and wherein the latch circuit utilizes the bit or bits and a clock signal to provide a band select signal for effecting selection of a second band by the communication apparatus.

15. The controller of claim 14 further comprising a plurality of output nodes for providing control signals to the input/output circuit, the receiver, and the transmitter for controlling operation of each thereof in response to the data included within the frequency command data signal.

16. The circuit of claim 14 further comprising a logic circuit connected to an output node of the controller, the logic circuit providing control signals to the input/output circuit, the receiver, and the transmitter for controlling operation of each thereof in response to the data included within the frequency command data signal.

17. The latch circuit of claim 14, including:

a first flip-flop with a clocking input for receiving the clock signal, a reset input connected to receive a strobe signal, and a data input connected to a predetermined logic state;

a second flip-flop with a clocking input connected to an output of the first flip-flop, a reset input connected to receive a reset signal, and a data input connected to receive data derived from a frequency command data signal; and

a third flip-flop with a clocking input connected to the strobe signal, a reset input connected to receive the reset signal, and a data input connected to an output of the second flip-flop; and

,

an output of the third flip-flop for providing the band select signal.

18. The latch circuit of claim 17, wherein the output of the first flip-flop provides a latch signal for latching a frequency data word derived from the frequency command data signal.

19. A system for facilitating band switching in a communication apparatus, the apparatus comprising:

an input/output (i/o) section including an input node;

a receiver connected to the i/o section;

a transmitter connected to the i/o section; and

a frequency synthesizer connected to the transmitter and receiver;

a circuit connected to an output of the receiver and connected to band-specific circuitry, wherein the circuit is responsive to at least one data bit of a frequency command data signal received at the input node and a clock signal and a control signal, the circuit thereby outputting a band select signal to select and enable the band-specific circuitry within the communication apparatus.

20. The system of claim 19, further including a controller connected to the receiver for 1) evaluating the data of the frequency command data signal, and based thereon, control the operation of the frequency synthesizer, and 2) generating the clock signal and the control signal to be used by the circuit.

21. The system of claim 20, wherein the controller further includes a digital signal processor for evaluating the frequency command data signal.

22. The system of claim 20, wherein the controller further includes a microprocessor for evaluating the frequency command data signal.

23. The system of claim 20, wherein the controller provides a signal for latching data of the frequency command data signal and the data thereafter used to define the operating state of the communication apparatus.

24. A communication apparatus comprising a selector, a second section, a third section and controller, and wherein the communication apparatus is capable of at least dual mode operating ability, and wherein state specific circuitry within the second section and state specific circuitry within the third section are both responsive to a pre-determination of a command signal;

the controller, in a first evaluation of the command signal provided by the selector, uses a specific subset of operable code to predetermine only a portion of the second operating state of the communication apparatus, and in a second evaluation of the command signal, uses additional operable code to determine the second operating state of the communication apparatus;

a first signal path from the controller to the state specific operating circuitry within the second section for generating a control signal to activate the state specific circuitry therein based on the predetermined portion of the second operating state; and

a second signal path to the state specific operating circuitry within the third section wherein a deselecting signal to deactivate the state specific circuitry therein based on the predetermined portion of the second operating state;

a plurality of signal paths connected from the controller and to a plurality of control circuits, wherein each control circuit is used to implement the second state as subsequently determined.

25. The communication apparatus of claim 24, wherein the controller includes a microprocessor used for determining the second state.

26. The communication apparatus of claim 24, wherein the controller includes a digital signal processor used for determining the second state.

27. The communication apparatus of claim 26, wherein the digital signal processor processes the operable code in cooperation with a microprocessor.

28. The communication apparatus of claim 24, wherein the controller includes an application specific integrated circuit (ASIC) including a logic circuit which connects to the signal path from the controller.

29. A method for providing operational control in a communication apparatus with at lea two states of operation, the communication apparatus including a first operational section, a second operational section, and a controller, the method comprising:

operating the communications apparatus in a first operating state;

receiving an operational command signal, the operational command signal including an operational data word used in specifying an operating state of the communication apparatus and at least one functional bit used in defining at least a portion of the operating state;

extracting the functional bit from the operational command signal to thereby generate at least one operational mode signal;

providing the operational mode signal or signals to the first operational section to modify operation thereof; and

, thereafter,

determining from the operational data word data which specifies a second operating state; and

,

controlling the first operational section and the second operational section from the controller and in conformity with the data which specified the second operating state.

30. The method of claim 29, wherein the step of determining includes processing the operational command signal by a digital signal processor to establish the data of the operational data word.

31. The method of claim 29, wherein the step of determining includes processing the operational command signal by a microprocessor to establish the data of the operational data word.

32. The method of claim 29, wherein the first operational section includes a portion of a receiver section of the communication apparatus.

33. The method of claim 29, wherein the first operational section includes a portion of a transmitter section of the communication apparatus.

34. The method of claim 29, wherein the first operational section includes a portion of a switching section of the communication apparatus.

35. The method of claim 29, wherein the second operational section includes a portion of a frequency synthesizer section of the communication apparatus.

36. The method of claim 29, wherein the second operational section includes a portion of a transmitter section of the communication apparatus.

37. The method of claim 29, wherein the second operational section includes a portion of a receiver section of the communication apparatus.

38. The method of claim 29, wherein the step of extracting includes holding the functional bit in a latch for at least the time the controller utilizes for evaluating the operational data word and for implementing the operational state defined by the functional bit.

39. The method of claim 29, wherein the step of extracting includes holding the functional bit in a latch for at least the time the controller utilizes for evaluating the operational data word and for implementing the operational state defined by the data of the operational data word.

40. The method of claim 29, wherein the step of coupling includes coupling the controller to a digital signal processor programmed with a set of computer instructions for controlling operation of the communication apparatus.

41. The method of claim 29, wherein the step of coupling includes coupling the controller to a logic circuit for controlling operation of the communication apparatus.

42. The method of claim 41, wherein the logic circuit includes a portion of an application specific integrated circuit (ASIC).