WIRELESS STATION, FAULT DETECTING METHOD, AND COMPUTER READABLE MEDIUM
First Claim
1. A wireless station that performs wireless communication with first and second wireless terminals based on a carrier sensing scheme, comprising:
- a measuring unit configured to communicate with the first and second wireless terminals and measure first and second communication delays of the first and second wireless terminals;
a first determining unit configured to determine first and second transmission rates of the first and second wireless terminals;
a second determining unit configured to determine first and second timings of transmitting a response request frame to each of the first and second wireless terminals and first and second response frame lengths of response frames to be returned from the first and second wireless terminals, based on the first and second transmission rates, the first and second communication delays, and a range of an initial backoff time for carrier sensing;
a transmitting unit configured to transmit a response request frame that requests returning of response frames having the first and second response frame lengths at the first and second transmission rates, to the first and second wireless terminals at the first and second transmission timings;
a receiving unit configured to receive the response frames returned from the first and second wireless terminals; and
a detecting unit configured to detect that the first and second wireless terminals are in hidden terminal relation upon detecting a collision of the response frames, whereinthe second determining unit determines the first and second response frame lengths and the first and second transmission timings so that the response frames returned from the first and second wireless terminals collide with each other given that the first and second wireless terminals are in the hidden terminal relation.
1 Assignment
0 Petitions
Accused Products
Abstract
A wireless station includes a measuring unit measuring first and second communication delays of first and second wireless terminals; a first determining unit determining first and second transmission rates of the first and second wireless terminals; a second determining unit determining first and second timings of transmitting a response request frame and first and second lengths of response frames to be returned from the first and second wireless terminals; a transmitting unit transmitting a response request frame that requests returning of response frames of the first and second lengths at the first and second transmission rates, at the first and second transmission timings; a detecting unit detecting that the first and second wireless terminals are in hidden terminal relation upon detecting a collision of the response frames returned from the first and second wireless terminals.
12 Citations
16 Claims
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1. A wireless station that performs wireless communication with first and second wireless terminals based on a carrier sensing scheme, comprising:
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a measuring unit configured to communicate with the first and second wireless terminals and measure first and second communication delays of the first and second wireless terminals; a first determining unit configured to determine first and second transmission rates of the first and second wireless terminals; a second determining unit configured to determine first and second timings of transmitting a response request frame to each of the first and second wireless terminals and first and second response frame lengths of response frames to be returned from the first and second wireless terminals, based on the first and second transmission rates, the first and second communication delays, and a range of an initial backoff time for carrier sensing; a transmitting unit configured to transmit a response request frame that requests returning of response frames having the first and second response frame lengths at the first and second transmission rates, to the first and second wireless terminals at the first and second transmission timings; a receiving unit configured to receive the response frames returned from the first and second wireless terminals; and a detecting unit configured to detect that the first and second wireless terminals are in hidden terminal relation upon detecting a collision of the response frames, wherein the second determining unit determines the first and second response frame lengths and the first and second transmission timings so that the response frames returned from the first and second wireless terminals collide with each other given that the first and second wireless terminals are in the hidden terminal relation. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A wireless station that performs wireless communication with first and second wireless terminals based on a carrier sensing scheme, comprising:
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a measuring unit configured to communicate with the first and second wireless terminals and measure first and second communication delays of the first and second wireless terminals; a first determining unit configured to determine first and second transmission rates of the first and second wireless terminals; a third determining unit configured to determine a common response frame length of response frames to be returned from the first and second wireless terminals for the first and second wireless terminals, based on the first and second transmission rates, the first and second communication delays, and a range of an initial backoff time for carrier sensing; a transmitting unit configured to transmit a response request frame that requests returning of response frames having the common response frame length, to the first and second wireless terminals simultaneously by multicast or broadcast; a receiving unit configured to receive the response frames returned from the first and second wireless terminals; and a detecting unit configured to detect that the first and second wireless terminals are in hidden terminal relation upon detecting a collision of the response frames, wherein the third determining unit determines the common response frame length so that the response frames returned from the first and second wireless terminals collide with each other given that the first and second wireless terminals are in the hidden terminal relation. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A fault detecting method performed in a wireless station that performs wireless communication with first and second wireless terminals based on a carrier sensing scheme, comprising:
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communicating with the first and second wireless terminals and measuring first and second communication delays of the first and second wireless terminals; determining first and second transmission rates of the first and second wireless terminals; determining first and second timings of transmitting a response request frame to each of the first and second wireless terminals and first and second response frame lengths of response frames to be returned from the first and second wireless terminals, based on the first and second transmission rates, the first and second communication delays, and a range of an initial backoff time for carrier sensing; transmitting the response request frame that requests returning of response frames having the first and second response frame lengths at the first and second transmission rates, to the first and second wireless terminals at the first and second transmission timings; receiving the response frames returned from the first and second wireless terminals; and detecting that the first and second wireless terminals are in hidden terminal relation upon detecting a collision of the response frames, wherein the determining timing and frame length includes determining the first and second response frame lengths and the first and second transmission timings so that the response frames returned from the first and second wireless terminals collide with each other given that the first and second wireless terminals are in the hidden terminal relation.
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14. A computer readable medium storing a computer program for causing a computer that performs wireless communication with first and second wireless terminals based on a carrier sensing scheme, to execute instructions of the steps of:
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communicating with the first and second wireless terminals and measuring first and second communication delays of the first and second wireless terminals; determining first and second transmission rates of the first and second wireless terminals; determining first and second timings of transmitting a response request frame to each of the first and second wireless terminals and first and second response frame lengths of response frames to be returned from the first and second wireless terminals, based on the first and second transmission rates, the first and second communication delays, and a range of an initial backoff time for carrier sensing; transmitting the response request frame that requests returning of response frames having the first and second response frame lengths at the first and second transmission rates, to the first and second wireless terminals at the first and second transmission timings; receiving the response frames returned from the first and second wireless terminals; and detecting that the first and second wireless terminals are in hidden terminal relation upon detecting a collision of the response frames, wherein the determining timing and frame length includes determining the first and second response frame lengths and the first and second transmission timings so that the response frames returned from the first and second wireless terminals collide with each other given that the first and second wireless terminals are in the hidden terminal relation.
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15. A fault detecting method performed in a wireless station that performs wireless communication with first and second wireless terminals based on a carrier sensing scheme, comprising:
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communicating with the first and second wireless terminals and measuring first and second communication delays of the first and second wireless terminals; determining first and second transmission rates of the first and second wireless terminals; determining a common response frame length of response frames to be returned from the first and second wireless terminals for the first and second wireless terminals, based on the first and second transmission rates, the first and second communication delays, and a range of an initial backoff time for carrier sensing; transmitting a response request frame that requests returning of response frames having the common response frame length, to the first and second wireless terminals simultaneously by multicast or broadcast; receiving the response frames returned from the first and second wireless terminals; and detecting that the first and second wireless terminals are in hidden terminal relation upon detecting a collision of the response frames, wherein the determining a common response frame length includes determining the common response frame length so that the response frames returned from the first and second wireless terminals collide with each other given that the first and second wireless terminals are in the hidden terminal relation.
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16. A computer readable medium storing a computer program for causing a computer that performs wireless communication with first and second wireless terminals based on a carrier sensing scheme, to execute instructions of the steps of:
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communicating with the first and second wireless terminals and measuring first and second communication delays of the first and second wireless terminals; determining first and second transmission rates of the first and second wireless terminals; determining a common response frame length of response frames to be returned from the first and second wireless terminals for the first and second wireless terminals, based on the first and second transmission rates, the first and second communication delays, and a range of an initial backoff time for carrier sensing; transmitting a response request frame that requests returning of response frames having the common response frame length, to the first and second wireless terminals simultaneously by multicast or broadcast; receiving the response frames returned from the first and second wireless terminals; and detecting that the first and second wireless terminals are in hidden terminal relation upon detecting a collision of the response frames, wherein the determining a common response frame length includes determining the common response frame length so that the response frames returned from the first and second wireless terminals collide with each other given that the first and second wireless terminals are in the hidden terminal relation.
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Specification