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Content caching and spectrum allocation joint design method for NOMA wireless video multicast

A content caching and wireless video technology, applied in the computer field, can solve problems such as limiting the efficiency of wireless resource utilization

Active Publication Date: 2021-11-02
NANJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, existing SVC multicast solutions [6]-[12] Limited to Orthogonal Multiple Access (OMA)
Different video layers are transmitted on orthogonal frequency resources, which limits the utilization efficiency of wireless resources

Method used

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  • Content caching and spectrum allocation joint design method for NOMA wireless video multicast
  • Content caching and spectrum allocation joint design method for NOMA wireless video multicast
  • Content caching and spectrum allocation joint design method for NOMA wireless video multicast

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Embodiment Construction

[0019] Below in conjunction with accompanying drawing and specific embodiment, the present invention is further described, specifically:

[0020] Application scenario system model description;

[0021] Model the content caching and frequency spectrum allocation method for NOMA wireless video multicast proposed by the present invention and raise questions.

[0022] The proposed joint resource optimization problem is decoupled into two sub-problems and a dynamic programming algorithm is designed to solve them.

[0023] The proposed scheme is simulated and evaluated.

[0024] 1 system model

[0025] Such as figure 1 As shown, a wireless cellular network scenario where one base station serves K multicast groups is considered. The number of base station cache resources and spectrum resources are denoted as C and f respectively, and the transmit power of the base station is denoted as P. In this scenario, multicast wireless video hierarchical buffering is performed to users in ...

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Abstract

The invention provides a content caching and spectrum allocation joint design method oriented to NOMA wireless video multicast. According to the method, joint allocation of cache resources, power and bandwidth resources is comprehensively considered, and the purpose is to maximize the overall video receiving quality of users in a multicast group under the constraint of multi-dimensional resources. According to the invention, the method comprises the steps: modeling spectrum allocation and layered video caching as a mixed integer linear programming problem; in order to facilitate processing, decoupling the optimization problem into a resource allocation sub-problem of intra-group spectrum constraint and cache constraint; finally, converting the resource allocation sub-problem of the intra-group spectrum constraint and the cache constraint into a knapsack problem, and designing a multicast group-oriented PSNR priority algorithm for solving. On the basis, a hierarchical content caching algorithm in a multicast group is designed to obtain an optimal PSNR and an optimal hierarchical video caching scheme. Simulation results show that the scheme is superior to the existing method in the aspects of network resource utilization rate, video receiving quality and the like.

Description

technical field [0001] The invention belongs to the technical field of computers, in particular to a joint design method of content buffering and frequency spectrum allocation for NOMA wireless video multicasting. Background technique [0002] With the popularization of smart terminals and the development of new mobile services, the demand for various application fields of wireless networks has exploded, which poses a major challenge to the fifth generation network (5G) [1] . Faced with the requirements of the new generation of wireless networks, traditional multiple access technologies have been difficult to meet, especially in terms of system throughput and user rate experience. Therefore, the industry proposes to adopt a new multiple access technology in 5G, that is, Non-Orthogonal Multiple Access (NOMA). NOMA can improve the system throughput and spectrum efficiency very well, and it can also increase the access capacity of system equipment exponentially. In some 5G sc...

Claims

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Application Information

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IPC IPC(8): H04W16/10H04W24/02H04W24/06
CPCH04W16/10H04W24/02H04W24/06Y02D30/70
Inventor 沈航唐昊白光伟王天荆王兴亚
Owner NANJING UNIV OF TECH
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