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A method and algorithm for a joint content cache and update strategy in the Internet of Things

A content caching, Internet of Things technology, applied in network traffic/resource management, services based on specific environments, electrical components, etc., can solve the problem of not being able to take into account data freshness and sensor energy consumption at the same time

Active Publication Date: 2020-12-22
NORTHWEST A & F UNIV
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Problems solved by technology

[0006] The purpose of the present invention is to provide a method and algorithm for joint content caching and updating strategies in the Internet of Things, which can solve the problem that existing methods cannot take into account both data freshness and sensor energy consumption, and can meet the freshness requirements. It can also achieve relatively stable overall network utility

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  • A method and algorithm for a joint content cache and update strategy in the Internet of Things

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Embodiment Construction

[0090] The technical solutions of the present invention will be further described below in conjunction with the drawings and embodiments.

[0091] A marginal contribution-based harmony revision (MHR) algorithm that includes:

[0092] (1) Input the harmony x to be corrected, the harmony x to be corrected is the cache policy configuration file, x=(x 1 , x 2 ,...,x J ), divide the content into two groups, and Given division J=J 0 ∪J 1 , where J 0 and J 1 Represents the uncached content set and the cached content set, respectively;

[0093] (2) The value of each cached content can be expressed as:

[0094]

[0095] In formula (1-1), J 1 -j represents the set J that excludes the content j 1 ; To use x=(x 1 , x 2 ,...,x J ) and x=(x 1 , x 2 ,...,x j =0,...,x J ) when the objective function difference; λ j Indicates the average arrival rate of retrieval requests for content j;

[0096] When correction is required, the set is obtained according to the harmon...

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Abstract

The invention discloses a method and an algorithm for a joint content cache and update strategy in the Internet of Things. The method includes: (1) determining whether to cache the content and the update cycle of the cached content; (2) determining two different modes (3) Determine the satisfaction of content transmission under the two modes; (4) Define the utility of the network; (5) Establish a problem P model in order to maximize the network utility; (6) According to the freshness Loss constraints, transform the satisfaction of content transmission in the network; (7) The objective function of the transformation problem P is P1; (8) Research the content caching strategy x and content update strategy T in the problem P1 U coupling between and deduce from x to T U (9) Using a harmony search-based content cache and update algorithm to solve problem P1. The method of the present invention adopts the content cache and update algorithm based on the harmony search, and can simultaneously take into account the energy consumption of the sensor and the freshness requirement of the content.

Description

technical field [0001] The invention belongs to the technical field of Internet of Things caching, and in particular relates to a method and algorithm for joint content caching and updating strategies in the Internet of Things. Background technique [0002] As an emerging technology of fifth-generation (5G) wireless networks, the Internet of Things (IoT) has attracted the attention of academia and industry in recent years. Specifically, IoT aims to enable ubiquitous connectivity between billions of things, ranging from tiny, resource-constrained sensors to more powerful smartphones and connected cars, requiring little or no human intervention. With the help of the Internet of Things, devices can sense and even interact with the surrounding physical environment, thereby providing us with many excellent and valuable applications such as smart homes, smart buildings, and smart cities. An obvious consequence of this trend towards intelligence that accompanies our daily lives i...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L29/08H04W4/38H04W28/14
CPCH04L67/12H04W4/38H04W28/14H04L67/568H04L67/5682
Inventor 徐超张建锋张凡来智勇王玺钧
Owner NORTHWEST A & F UNIV
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