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Cross-Entropy Method for Content Placement and User Association in Cache-Enabled Coordinated Ultra-Dense Networks
Jia Yu1, Ye Wang1,2, Shushi Gu1,2
1Communication Engineering Research Centre, Harbin Institute of Technology (Shenzhen), HIT Campus of University Town of Shenzhen, Shenzhen 518055, China.
Entropy (Basel, Switzerland)
|December 3, 2020
Summary
This study introduces cross-entropy methods for proactive caching in ultra-dense networks (UDNs) to boost 5G performance. The new strategies significantly reduce backhaul load and increase network throughput for cell edge users.
Area of Science:
- Wireless Communications
- Network Optimization
- 5G Mobile Networks
Background:
- Ultra-Dense Networks (UDNs) offer high data rates and low latency for 5G.
- Interference in UDNs necessitates Coordinated Multi-Point (CoMP) transmissions.
- Balancing network throughput and backhaul latency is a key challenge in CoMP-based UDNs.
Purpose of the Study:
- To investigate content placement and user association strategies for proactive caching in UDNs.
- To maximize network throughput for cell edge users while managing backhaul load.
- To address the complexity of non-convex combinatorial optimization problems in UDNs.
Main Methods:
- Decomposition of the optimization problem into two subproblems.
- Application of the cross-entropy (CE) method for content placement to minimize backhaul load.
- Utilization of the CE method for user association to enhance network throughput.
Main Results:
- The CE-based content placement scheme reduced backhaul load by 50% compared to random and 20% compared to Most Popular Content.
- The CE-based user association scheme achieved 30% and 23% throughput gains over N-best, No-CoMP, and Threshold schemes.
- Simulations validated the effectiveness of CE-based schemes in improving network throughput and reducing backhaul load.
Conclusions:
- Cross-entropy based strategies offer a viable solution for optimizing proactive caching in UDNs.
- The proposed methods effectively balance network throughput and backhaul latency.
- This research contributes to enhancing the performance of 5G mobile communications.
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