Method for enhancing fairness and performance in a multihop ad hoc network and corresponding system
First Claim
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1. A method for enhancing fairness and performance in a multihop ad hoc network, the method comprising:
- providing contention synchronization information regarding a transmission between a first set of nodes of the network, wherein the information is provided to a second set of nodes in a range of two hops from the first set of nodes participating at the transmission; and
setting, after successfully finishing the transmission, a waiting time for the first set of nodes, in which the first set of nodes backoff from accessing a transmission medium, wherein, the providing of the contention synchronization information provides the contention synchronization information by generating a first black burst energy signal by each node in a third set of nodes of the network receiving a transmission request or a transmission clearance, the first black burst energy signal indicating a busy time of the transmission medium according to a mapping scheme,wherein in the providing of the contention synchronization information, the method accords to a distributed coordination function, andwherein in the providing of the contention synchronization information, the transmission request comprises a request-to-send packet, the transmission clearance comprises a first clear-to-send packet, and the waiting time comprises a time for a request-to-send/clear-to-send-handshaking and a total backoff time of a minimum contention window.
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Abstract
A method for enhancing the fairness and performance in a multihop ad hoc network, the method usually including providing contention synchronization information regarding a transmission between nodes of the network, wherein the information is routinely provided to nodes in a range of two hops from the nodes participating at the transmission. The method also typically includes setting, after successfully finishing the transmission, a waiting time for the nodes participating at the transmission, in which these nodes backoff from accessing a transmission medium.
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Citations
12 Claims
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1. A method for enhancing fairness and performance in a multihop ad hoc network, the method comprising:
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providing contention synchronization information regarding a transmission between a first set of nodes of the network, wherein the information is provided to a second set of nodes in a range of two hops from the first set of nodes participating at the transmission; and setting, after successfully finishing the transmission, a waiting time for the first set of nodes, in which the first set of nodes backoff from accessing a transmission medium, wherein, the providing of the contention synchronization information provides the contention synchronization information by generating a first black burst energy signal by each node in a third set of nodes of the network receiving a transmission request or a transmission clearance, the first black burst energy signal indicating a busy time of the transmission medium according to a mapping scheme, wherein in the providing of the contention synchronization information, the method accords to a distributed coordination function, and wherein in the providing of the contention synchronization information, the transmission request comprises a request-to-send packet, the transmission clearance comprises a first clear-to-send packet, and the waiting time comprises a time for a request-to-send/clear-to-send-handshaking and a total backoff time of a minimum contention window. - View Dependent Claims (2, 3, 4)
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5. A system to enhance fairness and performance in a multihop ad hoc network, the system comprising:
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a first processor configured to provide contention synchronization information regarding a transmission between a first set of nodes of the network, and configured to provide the information to a second set of nodes in a range of two hops from the first set of nodes participating at the transmission; a second processor configured to set a waiting time for the first set of nodes after a successful finish of the transmission, in which the first set of nodes backoff from accessing a transmission medium; a first node configured to receive a transmission request or a transmission clearance, and configured to generate a black burst energy signal by each such receipt, the black burst energy signal indicating a busy time of the transmission medium according to a mapping scheme to provide the contention synchronization information; and a wireless local area network, wherein, in the first node, the transmission request comprises a request-to-send packet, the transmission clearance comprises a clear-to-send packet, and the waiting time comprises a time for a request-to-send/clear-to-send-handshaking and a total backoff time of a minimum contention window. - View Dependent Claims (6, 7, 8)
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9. A wireless local area network node, wherein:
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the node is configured to back off using a random value uniformly chosen between 0 and CWmin before accessing a channel, when a packet arrives to a Medium Access Control Layer from a higher layer; the node is configured to generate a black burst energy signal according to a mapping scheme, when the node receives a request-to-send or clear-to-send not for itself, wherein the black burst energy signal is not sent if the node detects the channel is busy; the node is configured to receive the black burst energy signal and attempts to access the channel for limited times before an end point of a time indicated by the black burst energy signal, wherein these attempts are not added to retransmission times for the packet; the node is configured to start a backoff timer at the end point of the time indicated by the black burst energy signal by using a random value uniformly chosen between 0 and CWmin, while a contention window for the node is not reset, if the node detects the channel is idle, wherein only an earliest time point is used if more than one black burst energy signal is received; and the node is configured to wait for a time period after a successful transmission, before the channel is accessed again, wherein length of the time period comprises a time for a request-to-send/clear-to-send-handshaking and a total backoff time of a minimum contention window. - View Dependent Claims (10, 11, 12)
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Specification