Message exchange device with spatial constraint

Abstract

The invention discloses a message exchange device with spatial constraint, which belongs to the technical field of message exchange device design, and comprises a spatial model subsystem used for forming expression with spatial range constraint between a publishing end and a subscribing end based on a theme t with spatial range constraint, a message m and a subscribing relation s, message exchange with spatial constraint is completed; the spatial index subsystem is used for constructing a plurality of SP-tree indexes, organizing subscription relations s under different themes of a subscription end through all the SP-tree indexes and maintaining all the SP-tree indexes, and maintaining all the SP-tree indexes comprises newly-added subscriptions and logout subscriptions; according to the invention, through providing theme-space matching filtering between the message and the subscription, the message transmission overhead is reduced, the selective forwarding of the message is realized, and the problems of high message transmission overhead and low communication efficiency are solved.

Description

technical field [0001] The invention belongs to the technical field of message exchange device design, and in particular relates to a message exchange device with space constraints. Background technique [0002] The message exchange device is the carrier of the message interaction in the smart city CPS, which needs to meet the functional requirements of decoupling, buffering, asynchronous communication and traffic peak shaving, and is the basis for the interaction and coordination of the smart city CPS system. The message conversion device in the smart city also needs to have the ability to constrain the space. It needs to support the dissemination of the messages published by the publishers within a certain spatial range, so that the subscribers can only receive the messages within the interested space, so as to provide more accurate information. Data interaction ability to achieve the purpose of saving network bandwidth. [0003] The traditional topic-oriented publish / sub...

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a message exchange device with space constraints to provide both publishers and subscribers with the ability to express space range constraints, and to provide both publishers and subscribers with the ability to express space range constraints, By providing topic-space matching and filtering between events and subscriptions, message delivery overhead is reduced, messages are selectively forwarded, and the problem of high message delivery overhead and low communication efficiency is solved

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