# US 2014/0192656 A1 · Method And Apparatus For Dynamic Spectrum Access

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- Number: US 2014/0192656 A1
- Document ID: US20140192656A1
- Status: Published application
- Kind: A1
- Application number: 14/204,516
- Filed: 2014-03-11
- Published: 2014-07-10
- Earliest claimed: 2008-10-10
- Assignees: The Trustees of the Stevens Institute of Technology
- Applicants: The Trustees of the Stevens Institute of Technology
- Inventors: Rajarathnam Chandramouli; Shamik Sengupta; Kai Hong
- Web page: https://patentgrep.com/patent/US20140192656A1

## CPC

- H04W 16/10: Dynamic resource partitioning
- H04L 49/252: {Store and forward routing}
- H04W 24/02: Arrangements for optimising operational condition
- H04W 36/02: Buffering or recovering information during reselection {; Modification of the traffic flow during hand-off}
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

Methods and apparatus are provided for the efficient use of cognitive radios in the performance of dynamic spectrum access. This includes spectrum sensing algorithms, adaptive optimized sensing of parameters based on changing radio environments, and identifying vacant channels. Protocols for switching communication links to different channels, and synchronizing communicating nodes in order to maintain reliable connectively while maximizing spectrum usage are also provided.

## Claims

### Claim 1

A method for facilitating communication between first and second communication devices, comprising the steps of:
establishing a first communication link between the first and second communication devices through a first data channel;
monitoring a plurality of second channels to determine whether they are used by incumbent users;
sending a management frame from the first communication device to the second communication device through the first data channel, the management frame including a list of the second channels, the list indicating a set of the second channels available for switching communication thereto;
establishing a second communication link between the first and second communication devices through one of the set of the second channels.

### Claim 2 (depends on 1)

The method of claim 1, wherein the management frame includes a bitmap, the list of the data channels being included in the bitmap.

### Claim 3 (depends on 2)

The method of claim 2, wherein the channel bitmap includes a bitmap vector, the list of the second channels being included in the bitmap vector, the bitmap vector including an indication for each of the second channels whether it is available for switching communication thereto.

### Claim 4 (depends on 1)

The method of claim 1, further comprising the step of receiving a response message at the first communication device from the second communication, said response message including a selection made by the second communication device on the set of the second channels.

### Claim 5 (depends on 4)

The method of claim 4, further comprising the step of sending an acknowledgement message from the first communication device to the second communication device confirming the selection made by the second communication device.

### Claim 6

A method for facilitating communication between first and second communication devices, comprising the steps of:
establishing a first communication link between the first and second communication devices through a first channel;
initiating a channel switching operation upon detecting a channel switching event associated with the first channel, said initiating step including the step of directing data transmitted from an upper layer of a communication protocol of the first communication device to a buffer for storage therein;
completing the channel switching operation by establishing a second communication link between the first and second communication devices through a second channel; and
transmitting the data stored in the buffer to the second communication device upon completing the completing step.

### Claim 7 (depends on 6)

The method of claim 6, wherein said directing step is performed continuously from the initiation of said initiating step until the completion of said completion step.

### Claim 8 (depends on 7)

The method of claim 7, wherein said directing step includes the step of creating the buffer in a MAC layer of the first communication device.

### Claim 9 (depends on 7)

The method of claim 7, wherein the data stored in the buffer is transmitted to the second communication device through the second channel.

### Claim at position 10

10-13. (canceled)