Method for combining resource allocation and content caching in F-RAN architecture

Abstract

The present invention relates to a method for combining resource allocation and content caching in an F-RAN architecture, and belongs to the field of mobile communication. The method comprises the following steps of: in an F-RAN scene, while content service delay and network slice SLA constraint are ensured, carrying out network slice wireless resource allocation and content caching decision by taking maximization of long-term average effectiveness of the system as a target; in each discrete time slot, according to length state of a content request virtual queue of an edge fog node of a current time slot and state information of network slice content transmission capability of a forward link and a wireless access link, allocating proper wireless resources for each network slice dynamicallywithin limitation of wireless resource capacity and cache capacity, and caching the content requested by the network slices at the edge fog node. According to the method and the device, the content service delay and the network slice SLA can be ensured, meanwhile, the forward link pressure is reduced, and the resource utilization rate is increased.

Description

technical field [0001] The invention belongs to the field of mobile communication, and relates to a method for joint resource allocation and content caching in an F-RAN architecture. Background technique [0002] With the continuous development of communication technology, a variety of application scenarios will appear in the future 5G network, which also means that different applications have different requirements for mobility, security, delay and reliability. How to meet the diverse business requirements has brought huge challenges to the existing network architecture. Therefore, a network slice (Network Slice, NS) technology emerges as the times require. At the same time, the Fog-Radio Access Network (F-RAN) architecture utilizes the computing, caching, and communication capabilities of edge fog nodes to distribute content to network slices, which not only reduces the pressure on fronthaul links and the BBU pool. The burden of signal processing also improves the utiliz...

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Problems solved by technology

[0004] Most of the existing research literature on resource allocation and content caching of network slicing has no Considering the impact of their dynamic and randomness on resource allocation and caching; without considering the impact of the current time slot decision on future resource allocation and content caching strategies, if the frequently requested content of the network slice is cached, spectrum resources will be saved , if you cache content that is rarely requested by network slices, it will cause a waste of cache resources, resulting in no space to cache content that should be cached, thereby wasting spectrum resources. Therefore, the strategy for spectrum resource allocation and content caching should establish a long-term optimization goal; The service delay of each type of content cannot be guaranteed, resulting in the situation that some content requests of network slices are discarded

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