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Generalized division free duplexing techniques for decreasing rendevous time

A technology, duplex technology, applied in the field of cognitive radio

Active Publication Date: 2011-10-19
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, rendezvous assisted schemes can be limited by bottlenecks on common channels and the added complexity and cost of dedicating certain control channels to certain clusters of devices in the network

Method used

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  • Generalized division free duplexing techniques for decreasing rendevous time
  • Generalized division free duplexing techniques for decreasing rendevous time
  • Generalized division free duplexing techniques for decreasing rendevous time

Examples

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Embodiment Construction

[0017] The blind rendezvous problem may refer to delays associated with establishing rendezvous between two devices, and may be caused by delays in satisfying two rendezvous requirements. First, in order to establish rendezvous using typical network configurations, a first device must communicate (eg, by transmitting and / or receiving signals) with a second device on the same frequency (eg, channel). Furthermore, the first device typically must transmit on the channel while the second device receives the transmission (eg, listens) on the same channel, or vice versa. Thus, for communication to occur, the first and second devices must rendezvous, or find a common channel on which signals can be transmitted by one device and received by the other device.

[0018] Typically, a beaconing approach can be used to rendezvous between two devices wishing to communicate. A beacon may refer to the periodic transmission of a signal over a sequence of one or more channels and may be used to...

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Abstract

Provided are methods and systems of using division-free duplexing (DFD) to reduce rendezvous time between two or more cognitive radio devices. The cognitive radio devices may opportunistically use available frequency spectra by communicating over available channels. To communicate, a first device may rendezvous with a second device by transmitting a beaconing signal over a frequency on which the second device is listening. DFD techniques may enable each of the devices to listen to a channel while concurrently transmitting beacon signals over the same channel. As periods of listening and periods of transmitting over the same channel need not be separated due to the transmitter cancelling approach used in DFD techniques, rendezvous time may be significantly reduced. Further, embodiments include a generalized DFD (GDFD) approach wherein devices listen to a broad band of frequencies, thus further reducing rendezvous time.

Description

technical field [0001] The subject matter disclosed herein relates to cognitive radio technology, and more particularly to systems and methods using partition-free duplexing over the cognitive radio spectrum. Background technique [0002] As wireless communications have evolved, the importance of efficient spectrum usage has become increasingly important. The Federal Communications Commission (FCC) has recognized that while many communication technologies squeeze within certain spectrum boundaries, many other parts of the radio spectrum are underutilized. Techniques for monitoring spectrum usage and opportunistically transmitting across unused frequencies in a manner that minimizes interference may be generally referred to as cognitive radio techniques. By using spectrum awareness, cognitive radio technology can provide more efficient use of spectrum and improve communication for various wireless technologies. [0003] Cognitive radio spectrum allocation may involve a clas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W16/14H04L25/03H04L5/26
CPCH04L5/1423H04L5/1461H04L27/0006H04L5/0073H04L25/03006H04W16/14
Inventor M·J·哈特曼J·E·赫希R·L·津泽J·A·F·罗斯M·J·德尔安诺
Owner GENERAL ELECTRIC CO
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