Method and apparatus for dynamic channel configuration

• US 5,926,501 A
• Filed: 12/12/1996
• Issued: 07/20/1999
• Est. Priority Date: 12/12/1996
• Status: Expired due to Term

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Hill, Casey, Souissi, Slim
• Primary Examiner(s): Chin, Stephen
• Assistant Examiner(s): Liu, Shuwang
• Application Number:
  US08/766,447
• Time in Patent Office: 950 Days
• Field of Search: 375/200, 375/206, 375/335, 375/202, 375/208, 375/347, 375/348, 370/335, 370/342, 370/209, 455/522, 455/69, 455/447, 379/60, 340/825.5
• US Class Current: 375/131
• CPC Class Codes: H04B 1/69 Spread spectrum techniques
• CPC Class Codes: H04B 7/2628 using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA] H04B7/2618 takes precedence
• CPC Class Codes: H04J 13/00 Code division multiplex systems for frequency hopping H04B1/713
• CPC Class Codes: H04W 72/542 using measured or perceived quality

Abstract

A controller (112) that dynamically configures a number of channels within a communication system (100) having a predetermined bandwidth comprises a processor (710) and memory (714), wherein the processor is programmed to receive a channel request (50) from a subscriber unit (122) for an inbound transmission of information. The processor is further programmed to determine a type of information to be transmitted from the channel request and configure the predetermined bandwidth into a number of channels based on the type of information to be transmitted from the subscriber unit.

Claims

1. A method for dynamically configuring a number of channels within a spread spectrum communication system having a predetermined bandwidth, comprising the steps at a controller of:

receiving a channel request from a subscriber unit for an inbound transmission of information, said step of receiving a channel request further comprises a step of receiving a packet of information containing address information, synchronization information, and transaction type information;

determining a type of information to be transmitted from the channel request; and

configuring the predetermined bandwidth into a number of channels based on the type of information to be transmitted from the subscriber unit, said step of configuring further including scheduling specific transactions assigning appropriate signalling and time slots and setting spread spectrum modulation types, channel grouping configurations, channel assignments, data rates, and code rates.

2. The method claim 1, wherein the step of setting spread spectrum modulation types further comprises a step of setting hopping rates, hopping patterns, spread ratios, and spread ratios within hops.

3. A method of selective call communication using a combination of spread spectrum spreading techniques, comprising the steps of:

assigning a frequency hopped spread spectrum technique to a subscriber unit when the subscriber unit indicates a data rate transmission equivalent to or above a first data rate threshold or a noise interference level equivalent to or below a first noise threshold;

assigning a hybrid frequency hopped and direct sequence spread spectrum technique to the subscriber unit when the subscriber unit indicates a data rate below the first data rate threshold or a noise interference level above the first noise threshold; and

assigning a direct sequence spread spectrum technique to the subscriber unit when the subscriber unit indicates a location finding application or a data rate below a second data rate threshold.

4. The method of claim 3, wherein the method further comprises a step of splitting a predetermined bandwidth into many channels when assigning a frequency hopped spread spectrum technique to the subscriber unit, and a step of grouping the many channels within the predetermined bandwidth into fewer channels when assigning the hybrid frequency hopped and direct spread spectrum technique to the subscriber unit and grouping the fewer channels into less channels when assigning the direct sequence spread spectrum technique to the subscriber unit.

5. The method of claim 4, wherein the method further comprises a step of using a block information word to inform the subscriber unit on how to split or group the predetermined bandwidth.

6. The method of claim 3, wherein the method further comprises a step of modifying a spread ratio for transmission from the subscriber unit based on the noise interference level measured.

7. A controller that dynamically configures a number of channels within a spread spectrum communication system having a predetermined bandwidth, comprises:

a processor and a memory, wherein the processor is programmed to;

receive a channel request from a subscriber unit for an inbound transmission of information and a packet of information containing address information, synchronization information, and transaction type information;

schedule specific transactions and assign appropriate signalling and time slots and set spread spectrum modulation types, channel grouping configurations, channel assignments, data rates, and code rates

determine a type of information to be transmitted from the channel request; and

configure the predetermined bandwidth into a number of channels based on the type of information to be transmitted from the subscriber unit.

8. The controller of claim 7, wherein the processor is further programmed to set hopping rates, hopping patterns, spread ratios, and spread ratios within hops.

9. A controller in a selective call communication system using a combination of spread spectrum spreading techniques, comprising:

a processor and a memory, wherein the processor performs the functions of;

assigning a frequency hopped spread spectrum technique to a subscriber unit when the subscriber unit indicates a data rate transmission equivalent to or above a first data rate threshold or a noise interference level equivalent to or below a first noise threshold;

assigning a hybrid frequency hopped and direct sequence spread spectrum technique to the subscriber unit when the subscriber unit indicates a data rate below the first data rate threshold or a noise interference level above the first noise threshold; and

assigning a direct sequence spread spectrum technique to the subscriber unit when the subscriber unit indicates a location finding application or a data rate below a second data rate threshold.

10. The controller of claim 9, wherein the processor further performs the function of splitting a predetermined bandwidth into many channels when assigning a frequency hopped spread spectrum technique to the subscriber unit, and grouping the many channels within the predetermined bandwidth into fewer channels when assigning the hybrid frequency hopped and direct spread spectrum technique to the subscriber unit and grouping the fewer channels into less channels when assigning the direct sequence spread spectrum technique to the subscriber unit.

11. The controller of claim 10, wherein the processor uses a block information word to inform the subscriber unit on how to split or group the predetermined bandwidth.

12. The controller of claim 9, wherein the processor further performs the function of modifying a spread ratio for transmission from the subscriber unit based on the noise interference level measured.

13. A controller in a selective call communication system using a combination of spread spectrum spreading techniques wherein the controller sends a control signal to a subscriber unit to transmit in a particular spread spectrum mode, the controller comprising:

a processor and a memory, wherein the processor performs the functions of;

assigning a direct sequence spread spectrum technique when the subscriber unit indicates a location finding application; and

otherwise

assigning a frequency hopped spread spectrum technique when the controller measures a low noise level environment or using a hybrid frequency hopped and direct sequence spread spectrum technique when the controller measures a high noise level environment.

14. A selective call transceiver that uses a combination of spread spectrum spreading techniques, comprises:

a selective call receiver for receiving a control signal from a controller directing the selective call transceiver to transmit in a particular spread spectrum mode; and

a transmitter for transmitting in the particular spread spectrum mode, wherein the transmitter transmits;

using a frequency hopped spread spectrum technique when the subscriber unit indicates a data rate transmission equivalent to or above a first data rate threshold or a noise interference level equivalent to or below a first noise threshold;

using a hybrid frequency hopped and direct sequence spread spectrum technique when the selective call transceiver indicates a data rate below the first data rate threshold or a noise interference level above the first noise threshold; and

using a direct sequence spread spectrum technique when the subscriber unit indicates a location finding application or a data rate below a second data rate threshold.

15. A selective call transceiver that uses a combination of spread spectrum spreading techniques, comprises:

a selective call receiver for receiving a control signal from a controller directing the selective call transceiver to transmit in a particular spread spectrum mode; and

a transmitter for transmitting in the particular spread spectrum mode, wherein the transmitter transmits;

using a direct sequence spread spectrum technique when the subscriber unit indicates a location finding application; and

otherwise

using a frequency hopped spread spectrum technique when the controller measures a low noise level environment or using a hybrid frequency hopped and direct sequence spread spectrum technique when the controller measures a high noise level environment.

16. A base receiver that receives transmissions from at least one of a plurality of selective call transceivers that uses a combination of spread spectrum spreading techniques, the base receiver comprising:

a selective call receiver for receiving a channel request on a predetermined bandwidth from at least one of the plurality of selective call transceivers, the channel request including a transmission type;

a noise detector for measuring a noise level environment during a transmission of information from the at least one of the plurality of selective call transceivers to the base receiver; and

a processor for configuring the predetermined bandwidth into a number of channels based on the transmission type and the noise level environment, wherein the transmission type is selected from the group consisting of location, short message, medium message, and long message.