Wireless internet congestion control method based on multi-path load balancing and controller thereof

Abstract

The invention discloses a wireless internet block control method and a controller therefore based on multipath load balance and relates to the technical field of wireless communication. On the basis of a multipath scheme, an effective grouping transmission distribution strategy is carried out at a sending end to solve grouping disorder (Out-Of-Order, OOO) problems. Parameters are shared among different logistic layers. A multipath shunt strategy is combined, and the block judge of the parameter information of the network layers is combined. In multipath, the ordered grouping distributing strategy of data is guaranteed to enhance the TCP performance of the wireless internet. When a source node detects that a time clock is time out or repeated ACK is not roused by block, a TCP error control module controls a message segment sending module for resending messages. Otherwise, a TCP block control strategy and a block control strategy basing on the prepared path distributing and grouping are adopted for relieving the block. The wireless internet block control method and the controller therefore basing on multipath load balance can be widely applied to wireless Ad hoc network, wireless Mesh network, wireless sensor network, etc.

Description

technical field [0001] The present invention relates to the communication field, in particular, to the congestion control technology of the wireless internet network. Background technique [0002] At present, the transmission layer of the wireless Internet basically adopts the transmission control protocol TCP (Transmission Control Protocol) in the traditional wired network, which establishes a connection between two nodes and provides a completely reliable, connection-oriented, full-duplex stream. Transmission services, and provide functions such as congestion control, error control and flow control for data transmission. And it does not apply to wireless multi-hop Internet networks. The main reason is that the traditional TCP scheme judges congestion through timeout and three repeated ACKnowledge characters, and reduces traffic by reducing the data transmission rate to achieve the purpose of congestion control. However, for wireless networks, repeated ACKs are not It doe...

AI Technical Summary

Problems solved by technology

Krishnan et al. in the open literature [I.Cidon, R.Rom, Y.Shavitt.Multi-Path Routing Combined with Resource Reservation.Proceedings of the Twentieth Annual Joint Conference of the IEEE Computer and Communications Societies, INFOCOM 1997.1997, (1): 92- 100] analyzed and researched the business flow segmentation problem under the source routing mechanism, and found that the finer the granularity of the business traffic distribution, the better the performance, but the finer granularity of the segmentation will lead to disorder among packets at the destination node.

[0005] For the out-of-sequence problem caused by multiple routes, the existing methods are to use the cache mechanism of the receiving end to solve the problem. The disadvantages of this type of mechanism are as follows: 1) It leads to an increase in the requirements of the receiving end for the data buffer; 2) If The transmitted services are real-time video streams and other services, which cannot be played immediately after receiving the data packets at the receiving end. It is necessary to reorder the out-of-sequence data packets after the arrival of the data packets on the longest path, which increases the number of data packets. end-to-end delay

The former involves the problem of repeated ACKs. By assuming that the loss and disorder of data packets are not caused by congestion, TCP enters a frozen state and retransmits unacknowledged segments at regular intervals until the corresponding ACK is received, but doing so The premise is to notify the congestion by displaying the ECN (Explicit Congestion Notification) message. However, the failure to receive the ECN signal cannot be used as a criterion for whether the network is congested, so this is not a well-considered solution.

The latter considers multi-channel communication to alleviate congestion, but it may take a long time to establish a new path for multi-channel shunting after congestion occurs.

In addition to the deficiencies in the above-mentioned schemes, these TCP improvement schemes are mostly proposed for single-path routing, without considering the congestion control problem in multi-path load balancing

Images