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Multi-antenna dense network random caching method based on airspace interference to zero

A dense network, multi-antenna technology, applied in the field of base station cache in ultra-dense networks, can solve problems such as difficult to support network service requirements, limited DSL backhaul link capacity, etc., to improve transmission reliability, overall performance, and storage. The effect of efficiency

Active Publication Date: 2019-11-29
SOUTHEAST UNIV
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  • Application Information

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Problems solved by technology

However, the capacity of the DSL backhaul link is often limited, and it is difficult to support the business needs of the network during peak hours

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  • Multi-antenna dense network random caching method based on airspace interference to zero

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Embodiment Construction

[0047] A random caching method for multi-antenna dense networks based on airspace interference to zero. The dense network system uses 20 uniformly distributed micro base stations to cover a square area of ​​2km × 2km. Each micro base station deploys 6 antennas and can store 10 For caching of files, users in the network will request 50 files, and the micro base station uses a random caching method to store files, and uses an interference-to-zero method to eliminate inter-cell interference, including the following steps:

[0048] Step 1. Model the multi-antenna dense network with a random caching strategy, derive the expression of the cache hit probability, and jointly optimize the micro base station cache allocation and interference to zero coefficient through the block coordinate ascending method, and design the cache hit probability Maximum optimal caching and interference-to-zero scheme;

[0049] Step 2. Store the file in the micro base station with the optimal cache solutio...

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Abstract

The invention provides a multi-antenna dense network random caching method based on airspace interference to zero. The method comprises the following steps: step 1, modeling a multi-antenna dense network adopting a random cache strategy, deriving an expression of a cache hit probability, and designing an optimal cache and interference to zero scheme which enables the cache hit probability to be maximum; step 2, storing the file in a micro base station in an optimal caching scheme, and establishing communication between a user and the corresponding micro base station according to a connection criterion of a file center; 3, enabling the user to send an interference-to-zero request to an interference micro base station located in the interference-to-zero area; and step 4, enabling the interference micro base station to determine a user set needing to assist interference to zero according to the received interference to zero request, estimate channel matrixes of the users, and design cooperative zero-forcing beamforming according to the channel matrixes so as to eliminate inter-cell interference. Interference in the random cache is reduced, and the system performance is improved.

Description

technical field [0001] The invention relates to a multi-antenna dense network random buffering method based on air space interference to zero, and belongs to the technical field of base station buffering in ultra-dense networks. Background technique [0002] In order to adapt to the exponential increase of mobile data services, in the future network, different levels of small cells (SmallCells) will be densely deployed. However, network densification (Network Densification) requires the deployment of longer backhaul links (Backhaul) to support data transmission, which will greatly increase the capital expenditure (Capital Expenditure, CAPEX) and operating expenditure (Operating Expense, OPEX) of network deployment. ). Therefore, in an actual dense network, the digital subscriber line (Digital Subscriber Line, DSL) of the copper cable is often used instead of the optical fiber used by the transmission cellular network to deploy the backhaul link. However, the capacity of th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W24/02H04W24/06H04W28/02H04W28/08H04B7/06H04L29/08
CPCH04W24/02H04W24/06H04W28/0236H04W28/08H04B7/0617H04B7/0634H04L67/06H04L67/568Y02D30/70
Inventor 刘楠匡肃奉刘晓宇
Owner SOUTHEAST UNIV