Collision avoidance for wireless networks
First Claim
1. A method, comprising:
- receiving, on a first frequency, a wireless signal at a particular node in a wireless network from a sending node, the wireless signal including an indication of a duration of the received wireless signal;
determining, at the particular node, whether the wireless signal is intended for the particular node before the wireless signal is completely received by examining a header of the received wireless signal to determine whether a destination address within the header corresponds to an address of the particular node; and
in response to determining that the wireless signal is intended for the particular node, transmitting, on a second frequency orthogonal from the first frequency, a non-colliding wireless carrier sense detected alert (CSDA) signal from the particular node while the wireless signal is being received to request that other nodes within communication distance of the particular node, except the sending node, refrain from transmitting for the duration of the received wireless signal.
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Accused Products
Abstract
In one embodiment, a particular node in a wireless network may receive a wireless signal, and may determine whether the wireless signal is intended for itself. In response to determining that the wireless signal is intended for the particular node, the particular node may transmit a non-colliding wireless carrier sense detected alert (CSDA) signal during the received wireless signal to request that other nodes within communication distance of the particular node refrain from transmitting for a duration of the received wireless signal. In another embodiment, a node listens on a first frequency for a wireless CSDA signal regarding a second (colliding) frequency, and in response to receiving a CSDA signal, may refrain from transmitting a wireless signal on the second frequency for the particular duration, or else (if not receiving a CSDA signal), may allow transmission of a wireless signal on the second frequency, accordingly.
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Citations
13 Claims
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1. A method, comprising:
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receiving, on a first frequency, a wireless signal at a particular node in a wireless network from a sending node, the wireless signal including an indication of a duration of the received wireless signal; determining, at the particular node, whether the wireless signal is intended for the particular node before the wireless signal is completely received by examining a header of the received wireless signal to determine whether a destination address within the header corresponds to an address of the particular node; and in response to determining that the wireless signal is intended for the particular node, transmitting, on a second frequency orthogonal from the first frequency, a non-colliding wireless carrier sense detected alert (CSDA) signal from the particular node while the wireless signal is being received to request that other nodes within communication distance of the particular node, except the sending node, refrain from transmitting for the duration of the received wireless signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus, comprising:
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one or more wireless network interfaces configured to receive a wireless signal on a first frequency, the wireless signal including an indication of a duration of the received wireless signal; a processor coupled to the wireless network interfaces and configured to execute one or more processes; and a memory configured to store a process executable by the processor, the process when executed configured to; determine, at the apparatus, whether the received wireless signal is intended for the apparatus before the wireless signal is completely received at the apparatus by examining a header of the received wireless signal to determine whether a destination address within the header corresponds to an address of the particular node; and transmit, in response to the wireless signal being intended for the apparatus, on a second frequency orthogonal from the first frequency, a non-colliding wireless carrier sense detected alert (CSDA) signal on at least one of the wireless network interfaces while the wireless signal is being received to request that other nodes within communication distance of the apparatus, except the sending node, refrain from transmitting for the duration of the received wireless signal. - View Dependent Claims (8, 9)
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10. A tangible, non-transitory, computer-readable media having software encoded thereon, the software when executed by a processor configured to:
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determine, at the particular node, whether a wireless signal received on a first frequency at a particular node is intended for the particular node before the wireless signal is completely received by examining a header of the received wireless signal to determine whether a destination address within the header corresponds to an address of the particular node; and in response to a determination that the wireless signal is intended for the particular node, transmit, on a second frequency orthogonal from the first frequency, a non-colliding wireless carrier sense detected alert (CSDA) signal from the particular node while the wireless signal is being received to request that other nodes within communication distance of the particular node, except the sending node, refrain from transmitting for the duration of the received wireless signal. - View Dependent Claims (11, 12, 13)
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Specification