Multiple devices communicating on a single communication channel with a consecutively sequenced signal

• US 8,000,385 B2
• Filed: 08/14/2008
• Issued: 08/16/2011
• Est. Priority Date: 08/14/2008
• Status: Active Grant

• Current Assignee: Computime Electronics Company Limited
• Original Assignee: Computime Electronics Company Limited
• Inventors: Liu, Jason, Wei, Wright, Fung, Hardy, Ding, Xin
• Primary Examiner(s): Tran; Khanh C
• Application Number:
  US12/191,679
• Publication Number:
  US 20100040132A1
• Time in Patent Office: 1,097 Days
• Field of Search: 375/285, 375/295, 375/238, 370/295, 370/338, 370/342, 370/349, 370/445
• US Class Current: 375/238
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365

Abstract

The present invention provides apparatuses, methods, and computer readable media for supporting communications for a plurality of transmitter-receiver pairs on a common frequency spectrum. A transmitting device transmits a consecutively sequenced signal sequentially containing messages to a corresponding receiving device. A duty cycle adjustment circuit determines the duration between adjacent messages so that the consecutively sequenced signal is characterized by a randomized duty cycle. The duty cycle adjustment circuit selects the duration from a sequence that is characterized by an average duration. The duty cycle adjustment circuit obtains the duration from an array by determining an index from a function of a random variable. A receiving device receives a consecutively sequenced signal sequentially containing messages from a transmitting device, where the consecutively sequenced signal is characterized by a randomized duty cycle. A processing circuit detects the messages and initiates an error signal when a predetermined number of consecutive invalid messages are detected.

Claims

1. A transmitting device comprising:

a transmitting circuit configured to send a consecutively sequenced signal sequentially containing a plurality of messages to a receiving device; and

a duty cycle adjustment circuit configured to;

determine a determined duration between one of the plurality of messages and an adjacent message;

select the determined duration from a sequence characterized by an average duration;

obtain the determined duration from the sequence by determining an index to the sequence; and

instruct the transmitting circuit to send said one message based on the determined duration, wherein the consecutively sequenced signal is characterized by an essentially randomized duty cycle.

2. The transmitting device of claim 1, wherein the duty cycle adjustment circuit determines the index from a function of a random variable.

3. The transmitting device of claim 1, wherein the duty cycle adjustment circuit determines an initial duration from a function of a serial number of the transmitting device.

4. The transmitting device of claim 1, wherein the duty cycle adjustment circuit determines the determined duration from a function of a previous duration.

5. A receiving device comprising:

a receiving circuit configured to receive a consecutively sequenced signal sequentially containing a plurality of messages from a transmitting device, wherein the consecutively sequenced signal is characterized by an essentially randomized duty cycle; and

a processing circuit configured to process the plurality of messages and to initiate an error signal when a predetermined number of consecutive invalid messages are detected.

6. A method comprising:

determining a determined duration between one of a plurality of messages and an adjacent message, wherein the determined duration has an essentially randomized characteristic;

transmitting a consecutively sequenced signal containing the plurality of messages to a receiving device based on the determined duration;

selecting the determined duration from a sequence characterized by an average duration; and

obtaining the determined duration from the sequence by determining an index to the sequence.

7. The method of claim 6, further comprising:

determining the index from a function of a random variable.

8. The method of claim 7, further comprising:

utilizing the random variable as an algebraic sign in a relationship relating the determined duration with a previous duration.

9. The method of claim 6, further comprising:

determining an initial duration from a function of a serial number of the transmitting device.

10. The method of claim 6, further comprising:

determining the determined duration from a function of a previous duration.

11. A non-transitory computer-readable medium having computer-executable instructions that when executed perform the steps of

determining a determined duration between one of a plurality of messages and an adjacent message, wherein the determined duration has an essentially randomized characteristic;

transmitting a consecutively sequenced signal containing the plurality of messages to a receiving device based on the determined duration;

selecting the determined duration from a sequence characterized by an average duration; and

obtaining the determined duration from the sequence by determining an index to the sequence.

12. The non-transitory computer-readable medium of claim 11, further including computer-executable instructions that when executed perform the step of:

determining the index from a function of a random variable.

13. The non-transitory computer-readable medium of claim 11, further including computer-executable instructions that when executed perform the step of:

determining an initial duration from a function of a serial number of the transmitting device.

14. The non-transitory computer-readable medium of claim 11, further including computer-executable instructions that when executed perform the step of:

determining the determined duration from a function of a previous duration.