Resource reservation method and device

Abstract

Disclosed are a resource reservation method and device, which are applied to a WiFi system. The method includes the following steps: a target node receives a resource reservation request sent by a source node and sends a resource reservation response to the source node, wherein the resource reservation response includes a reservation time, and the resource reservation response is used for enabling other nodes which are capable of monitoring the resource reservation response in the WiFi system to set respective network allocation vectors according to the reservation time; and the target node judges whether data sent by the source node is received in a preset time and if not so, a resource release instruction is sent to the other nodes so as to enable the other nodes to initialize the respective network allocation vectors and re-compete for resources. Therefore, a hidden node problem is solved and at the same time, sufficient and reasonable utilization of network resources are ensured.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a resource reservation method and device. Background technique [0002] In order to solve the "hidden node" problem existing in the WiFi network, the IEEE802.11 standard introduces the RTS / CTS (Request To Send / Clear To Send) mechanism, which is equivalent to a handshake protocol, and its basic principle That is, the source node and the destination node each send a short frame for reserving resources, so as to suppress other nodes from competing for resources. The specific process can be briefly described as follows: [0003] First, the source node sends an RTS (Request To Send, request to send) frame to other nodes in the network, so that the node that listens to the frame sets its own NAV (Network Allocation Vector, network allocation vector), and then avoid resource competition with the source node by means of NAV countdown. [0004] Secondly, after the destina...

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Problems solved by technology

[0007] However, affected by factors such as interference and random noise, the channel of the WiFi system is often in an unstable state, which may cause the failure of CTS frame transmission or the failure of the source node to parse the CTS frame, which will cause the source node to no longer perform subsequent data The frame is sent so that the destination node cannot receive the data frame sent by the source node after sending a CTS frame and a SIFS interval

However, after the destination node sends the CTS frame, the nodes that can detect the frame have set their own NAV according to the time T2, and these nodes always think that the channel is busy before the NAV returns to zero, and their transmission is suppressed, which will This results in a waste of channel resources during this time period and reduces the utilization of network resources.

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