Collision detectable link layer control method

Abstract

The invention provides a link layer control method capable of detecting conflicts. The method comprises the following steps: broadcasting a notification message to a transmission node by using a receiving node, and starting an RSVP (Resource Reservation Protocol) window including a plurality of time slices, wherein the notification message comprises two parameters, namely, n and m; if data packets to be forwarded exists in the transmission node, calculating a time slice sequence number according to the attached parameters n and m after receiving the notification message, and selecting corresponding time slices from the RSVP window; replying an acknowledgement frame to the receiving node; after the RSVP window ends, speculating the time slice sequence number of the received acknowledgement frame according to the receiving time of each acknowledgement frame by using the receiving node; broadcasting a poll frame to the transmission node by using the receiving node, and embedding the speculated time slice sequence number of the acknowledgement frame in the poll frame; transmitting the data packets in sequence in a polling way by using the transmission node. By adopting the link layer control method, transmission conflicts can be avoided effectively.

Description

technical field

[0001] The invention relates to the fields of wireless ad hoc networks and sensor networks, in particular to a conflict-avoidable link control layer protocol initiated by a receiver in a wireless sensor network. Background technique

[0002] With the increasing maturity of communication, sensor manufacturing, and embedded computing, large-scale wireless sensor network technology develops rapidly and is widely used in many fields such as environment, national defense, medical treatment, and urban management. A typical wireless sensor network is composed of a large number of miniature sensor nodes, which can be rapidly deployed in harsh and dangerous environments, and form a network through wireless self-organization, which is not limited by the existing wired network infrastructure. Perceived data is collected to the data processing center through wireless communication. Wireless sensor networks enable people to obtain a large amount of detailed and reliable ...

Examples

Embodiment Construction

[0036] The present invention will be further described below in conjunction with specific drawings and embodiments.

[0037]The core principle of the present invention is: after the receiver wakes up and sends a notification message (S-probe), using the idea of ​​time diversity, all senders and receivers temporarily synchronize time and divide the next period of time is a number of time slices of equal length. The sender gives the receiver a reply (acknowledgment frame ACK) in different time slots. According to the number of received ACKs and the sequence number of the time slice, the receiver can immediately know the number of senders and distinguish them by the sequence number of the time slice.

[0038] (1) Overall description of the protocol

[0039] In order to better understand the working mode of the sensor node in the transmission mode initiated by the receiver, we next describe the typical workflow of the sensor node and give a new protocol (CD-MAC link layer contro...

technical field

[0001] The invention relates to the fields of wireless ad hoc networks and sensor networks, in particular to a conflict-avoidable link control layer protocol initiated by a receiver in a wireless sensor network. Background technique

[0002] With the increasing maturity of communication, sensor manufacturing, and embedded computing, large-scale wireless sensor network technology develops rapidly and is widely used in many fields such as environment, national defense, medical treatment, and urban management. A typical wireless sensor network is composed of a large number of miniature sensor nodes, which can be rapidly deployed in harsh and dangerous environments, and form a network through wireless self-organization, which is not limited by the existing wired network infrastructure. Perceived data is collected to the data processing center through wireless communication. Wireless sensor networks enable people to obtain a large amount of detailed and reliable ...

Examples

Embodiment Construction

[0036] The present invention will be further described below in conjunction with specific drawings and embodiments.

[0037]The core principle of the present invention is: after the receiver wakes up and sends a notification message (S-probe), using the idea of ​​time diversity, all senders and receivers temporarily synchronize time and divide the next period of time is a number of time slices of equal length. The sender gives the receiver a reply (acknowledgment frame ACK) in different time slots. According to the number of received ACKs and the sequence number of the time slice, the receiver can immediately know the number of senders and distinguish them by the sequence number of the time slice.

[0038] (1) Overall description of the protocol

[0039] In order to better understand the working mode of the sensor node in the transmission mode initiated by the receiver, we next describe the typical workflow of the sensor node and give a new protocol (CD-MAC link layer contro...

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