Method and apparatus for receiving a radio signal within a home control channel in a multichannel radio communication system

• US 5,875,387 A
• Filed: 04/07/1995
• Issued: 02/23/1999
• Est. Priority Date: 04/07/1995
• Status: Expired due to Term

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Ayerst, Douglas I.
• Primary Examiner(s): Faile, Andrew I.
• Application Number:
  US08/418,735
• Time in Patent Office: 1,418 Days
• Field of Search: 455/31.3, 455/38.1, 455/62, 455/515, 455/450
• US Class Current: 340/7.42
• CPC Class Codes: H04W 48/20 Selecting an access point
• CPC Class Codes: H04W 8/245 from a network towards a terminal
• CPC Class Codes: H04W 88/022 Selective call receivers
• CPC Class Codes: H04W 88/025 Selective call decoders

Abstract

In a system controller (102) a quantity of control channels is determined; a portion (344) of a code word (338) is set to identify the quantity of control channels; the code word (358) is transmitted in a predetermined portion (332) of each of a plurality of radio signals. In a multichannel radio (106) a receiver (610) is set to a first channel which includes one of the plurality of radio signals; the portion (344) of the code word (338) is decoded; one of the set of control channels is identified as a new home control channel, the home control channel is revised to the new home control channel, and the receiver (610) is set to the home control channel as revised. The one of the set of control channels is identified based on the quantity of control channels and a predetermined number in the multichannel radio (106).

Claims

1. A method used in a multichannel radio for receiving a first radio signal within a home control channel, wherein the multichannel radio is used within a radio communication system having a plurality of outbound radio channels, and wherein a set of control channels is a subset of the plurality of outbound radio channels, and wherein the method comprises the steps of:

setting a receiver in the multichannel radio to a first channel which is one of the plurality of outbound radio channels;

decoding a predetermined portion of a code word included in a predetermined portion of a second radio signal received within the first channel which identifies a quantity of control channels which form the set of control channels;

identifying one of the set of control channels as a new home control channel based on the quantity of control channels and a predetermined number in the multichannel radio and revising the home control channel to the new home control channel; and

setting said receiver to the home control channel as revised in said step of identifying, for receiving the first radio signal.

2. The method according to claim 1, further comprising a step of revising the home control channel to a predetermined default control channel when the portion of the code word included in the predetermined portion of the second radio signal is not decoded in said step of decoding within a predetermined number of transmission cycles.

3. The method according to claim 1, wherein the multichannel radio has a selective call address, and wherein the predetermined number in said step of identifying is a predetermined portion of the selective call.

4. The method according to claim 1, wherein said step of identifying comprises the step of:

determining an identification of the new home control channel as a mathematical function of the predetermined number and the quantity of control channels.

5. The method according to claim 1, wherein said step of identifying comprises the step of:

determining an identification of the new home control channel using a look-up table having the predetermined number and the quantity of control channels as inputs.

6. The method according to claim 1, wherein the first channel in said step of setting the receiver in the multichannel radio to a first channel is one of the set of control channels.

7. The method according to claim 1, wherein information in the first radio signal in said steps of setting said receiver to the home control channel and in the second radio signal in said step of decoding the predetermined portion of the code word is organized according to an outbound signaling protocol having protocol divisions of cycle, frame, block, word, and bit equivalent in quantity, duration, and numbering to a FLEX™

protocol, and wherein the predeteremined portion of the code word which identifies the quantity of control channels is in a predetermined word of a predetermined block of a frame of the outbound signaling protocol.

8. A method used in a system controller for transmitting a radio signal to a multichannel radio within a home control channel in a radio communication system having a plurality of outbound radio channels, wherein a set of control channels are a subset of the plurality of outbound radio channels, and wherein the method comprises the steps of:

determining a quantity of control channels which form the set of control channels;

setting a predetermined portion of a code word to identify the quantity of control channels;

sending the code word to a transmitter/receiver for transmission in a predetermined portion of each of a plurality of radio signals transmitted within the set of control channels during a first transmission cycle;

identifying one of the set of control channels as a new home control channel for the multichannel radio based on the quantity of control channels and a predetermined number stored in the multichannel radio;

storing the new home control channel as the home control channel associated with the multichannel radio; and

sending information to a transmitter/receiver for inclusion in the radio signal, wherein the radio signal is transmitted within the home control channel during a transmission cycle subsequent to the first transmission cycle.

9. The method according to claim 8, wherein the radio signal in said step of sending information to a transmitter/receiver includes an address of the multichannel radio.

10. The method according to claim 8, wherein said step of identifying comprises the step of:

determining an identification of the new home control channel as a mathematical function of the predetermined number and the quantity of control channels.

11. The method according to claim 8, wherein said step of identifying comprises the step of:

determining an identification of the new home control channel using a look-up table having the predetermined number and the quantity of control channels as inputs.

12. The method according to claim 8, wherein the predetermined number in said step of identifying one of the set of control channels is a predetermined portion of a address of the multichannel radio.

13. The method according to claim 8, wherein information in the plurality of radio signals in said step of sending the code word to a transmitter/receiver and in the radio signal in said step of sending information to a transmitter/receiver is organized according to an outbound signaling protocol having protocol divisions of cycle, frame, block, word, and bit equivalent in quantity, duration, and numbering to a FLEX™

protocol, and wherein the predetermined portion of the code word which identifies the quantity of control channels is in a predetermined word of a predetermined block of a frame of the outbound signaling protocol.

14. A multichannel radio for receiving a first radio signal within a home control channel, wherein the multichannel is used within a radio communication system having a plurality of outbound radio channels, and wherein a set of control channels is a subset of the plurality of outbound radio channels, and wherein the multichannel radio comprises:

a receiver for receiving and demodulating radio signals;

a decoder coupled to said receiver for decoding code words from the radio signals;

a channel selector element coupled to said receiver for setting said receiver in the multichannel radio to a first channel which is one of the plurality of outbound radio channels;

a control channel quantity element coupled to said decoder for decoding a predetermined portion of a code word included in a predetermined portion of a second radio signal received within the first channel which identifies a quantity of control channels which form the set of control channels;

a home channel identifier element for identifying one of the set of control channels as a new home control channel based on the quantity of control channels and a predetermined number in the multichannel radio and revising the home control channel to the new home control channel; and

wherein the channel selector element is further coupled to said home channel identifier element for setting said receiver to the home control channel as revised by said home channel identifier element, for receiving the first radio signal.

15. The multichannel radio according to claim 14, further comprising a lost control channel element coupled to said control channel quantity element and said channel selector element for revising the home control channel to a predetermined default control channel when the portion of the code word included in the predetermined portion of the second radio signal is not decoded by said control channel quantity element within a predetermined number of transmission cycles.

16. The multichannel radio according to claim 14, wherein the multichannel radio further comprises a code memory for storing a selective call address, and wherein the predetermined number is a predetermined portion of the selective call address.

17. The multichannel radio according to claim 14, wherein said home channel identifier element comprises a calculation element for determining an identification of the new home control channel as a mathematical function of the predetermined number and the quantity of control channels.

18. The multichannel radio according to claim 14, wherein said home channel identifier element comprises a look up table for determining an identification of the new home control channel, wherein the look up table has the predetermined number and the quantity of control channels as inputs.

19. The multichannel radio according to claim 14, wherein the first channel which is set by said channel selector element is one of the set of control channels.

20. The multichannel radio according to claim 14, wherein information in the first radio signal in and the second radio signal received by said receiver when set by said channel selector element is organized according to an outbound signaling protocol having protocol divisions of cycle, frame, block, word, and bit equivalent in quantity, duration, and numbering to a FLEX™

protocol, and wherein the predetermined portion of the code word which identifies the quantity of control channels is in a predetermined word of a predetermined block of a frame of the outbound signaling protocol.

21. A system controller for transmitting a radio signal to a multichannel radio, wherein the multichannel radio is used within a home control channel in a radio communication system having a plurality of outbound radio channels, and wherein a set of control channels are a subset of the plurality of outbound radio channels, and wherein the system controller comprises:

an outbound message memory for storing a queue of outbound messages intended for a plurality of multichannel radios;

a channel organizer element coupled to said outbound message memory for determining a quantity of control channels which form the set of control channels;

a control channel indicator element coupled to said channel organizer element for setting a predetermined portion of a code word to identify the quantity of control channels;

a cell site controller coupled to said control channel indicator element for sending the code word to a transmitter/receiver for transmission in a predetermined portion of each of a plurality of radio signals transmitted within the set of control channels during a first transmission cycle;

a subscriber data base for storing a first predetermined number which is based on a second predetermined number stored in the multichannel radio;

a home channel identifier element coupled to said channel organizer element and said subscriber data base for identifying one of the set of control channels as a new home control channel for the multichannel radio based on the quantity of control channels and the second predetermined number stored in the multichannel radio;

wherein said subscriber data base is coupled to said home channel identifier element for storing the new home control channel as the home control channel associated with the multichannel radio; and

wherein said cell site controller is further coupled to said outbound message memory and said subscriber data base for sending message information to the transmitter/receiver for inclusion in the radio signal which is transmitted within the home control channel stored in said subscriber data base during a transmission cycle subsequent to the first transmission cycle.

22. The system controller according to claim 21, wherein said cell site controller includes an address of the multichannel radio in the radio signal.

23. The system controller according to claim 21, wherein said home channel identifier element includes a calculation element for determining an identification of the new home control channel as a mathematical function of the second predetermined number and the quantity of control channels.

24. The system controller according to claim 21, wherein said home channel identifier element includes a look up table for determining an identification of the new home control channel, and wherein the look up table has the second predetermined number and the quantity of control channels as inputs.

25. The system controller according to claim 21, wherein information in the plurality of radio signals and the radio signal sent by said cell site controller for transmission by said transmitter/receiver is organized according to an outbound signaling protocol having protocol divisions of cycle, frame, block, word, and bit equivalent in quantity, duration, and numbering to a FLEX™

protocol, and wherein the predetermined portion of the code word which identifies the quantity of control channels is in a predetermined word of a predetermined block of a frame of the outbound signaling protocol.