Node device, network system, and method for discovering neighbor of node device in TVWS communication environment
First Claim
Patent Images
1. A node device using a TV white space (TVWS), comprising:
- a transceiver configured to transmit/receive a beacon frame to scan a sub-channel in a digital TV (DTV) channel; and
a controller configured to;
compare energy levels of a first sub-channel and at least one second sub-channel adjacent to the first sub-channel among a plurality of sub-channels with respect to the DTV channel including the plurality of sub-channels,decide whether the DTV channel is an available channel, anddiscover the beacon frame by scanning the first sub-channel in the DTV channel if the DTV channel is decided as the available channel,wherein the controller calculates a correlation value between the energy level of the first sub-channel and the energy level of the second sub-channel, and decides whether the DTV channel is the available channel by comparing the calculated correlation value with a predetermined critical value, andwherein the correlation value is calculated according to the following equation;
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Abstract
A node device using a TV white space (TVWS) includes a decision unit for comparing energy levels of a first sub-channel and at least one second sub-channel adjacent to the first sub-channel among a plurality of sub-channels with respect to a digital TV (DTV) channel including the plurality of sub-channels and deciding whether the DTV channel is an available channel, and a discovery unit for, if the DTV channel is decided as the available channel, discovering a beacon by scanning the first sub-channel in the DTV channel.
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Citations
15 Claims
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1. A node device using a TV white space (TVWS), comprising:
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a transceiver configured to transmit/receive a beacon frame to scan a sub-channel in a digital TV (DTV) channel; and a controller configured to; compare energy levels of a first sub-channel and at least one second sub-channel adjacent to the first sub-channel among a plurality of sub-channels with respect to the DTV channel including the plurality of sub-channels, decide whether the DTV channel is an available channel, and discover the beacon frame by scanning the first sub-channel in the DTV channel if the DTV channel is decided as the available channel, wherein the controller calculates a correlation value between the energy level of the first sub-channel and the energy level of the second sub-channel, and decides whether the DTV channel is the available channel by comparing the calculated correlation value with a predetermined critical value, and wherein the correlation value is calculated according to the following equation; - View Dependent Claims (2, 3, 4, 5, 6)
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7. A TVWS network system, comprising:
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a first node device including at least one controller, wherein the first node device is configured to select, as an available channel, at least one DTV channel among a plurality of DTV channels, based on acquired available channel information, and transmit a beacon frame by using a pilot channel in the DTV channel selected as the available channel; and a second node device including at least one controller, wherein the second node device is configured to compare energy levels of a pilot channel in a DTV channel corresponding to each of the plurality of DTV channel and at least one adjacent channel, decide whether the corresponding DTV channel is the DTV channel selected as the available channel, and discover a beacon frame by scanning the pilot channel in the DTV channel selected as the available channel, wherein each of the plurality of DTV channels includes a plurality of sub-channels, and wherein the first node device and the second node device select any one of the plurality of sub-channels as the pilot channel according to the following equation; - View Dependent Claims (8, 9)
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10. A method for discovering a neighbor of a node device in a TVWS communication environment, the method comprising:
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comparing energy levels of a first sub-channel and at least one second sub-channel adjacent to the first sub-channel among a plurality of sub-channels with respect to a DTV channel including the plurality of sub-channels and deciding whether the DTV channel is an available channel; and if the DTV channel is decided as the available channel, discovering a beacon frame by scanning the first sub-channel in the DTV channel, wherein the deciding of whether the DTV channel is the available channel includes; calculating a correlation value between the energy level of the first sub-channel and the energy level of the second sub-channel; and deciding whether the DTV channel is the available channel by comparing the calculated correlation value with a predetermined critical value, and wherein the correlation value is calculated according to the following equation; - View Dependent Claims (11, 12, 13, 14, 15)
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Specification