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Combination Network with Multiaccess Caching.
Bowen Zheng1, Yifei Huang1,2, Dianhua Wu3,4
1Key Lab of Education Blockchain and Intelligent Technology, Ministry of Education, Guangxi Normal University, Guilin 541004, China.
Entropy (Basel, Switzerland)
|February 27, 2026
Summary
This study introduces a new coded caching scheme for multi-access networks, improving data retrieval efficiency. The proposed design approaches theoretical limits, especially with larger cache sizes.
Area of Science:
- Computer Science
- Information Theory
- Telecommunications
Background:
- Traditional combination networks involve a central server, cache-less relays, and users with local caches.
- Existing systems face limitations in multi-access scenarios with multiple cache nodes.
Purpose of the Study:
- To investigate and propose an efficient coded caching scheme for (H,r,L,Λ,M,N) combination networks with multi-access caching.
- To analyze the performance of the proposed scheme and compare it with existing bounds.
Main Methods:
- A group-wise operation is employed to simplify the scheme design for H≥Λ and r≥L regimes.
- An explicit coded caching scheme is constructed using array-based representations and a combinatorial placement delivery array (CPDA).
- The Maddah-Ali-Niesen (MN) placement strategy is adapted for the proposed scheme.
Main Results:
- An achievable design is demonstrated through group-wise operations, reducing complexity.
- The proposed scheme, particularly for Λ=H and L=r, shows performance nearing the converse bound of traditional combination networks.
- Numerical comparisons using the user-retrievable cache ratio indicate performance improvements.
Conclusions:
- The developed coded caching scheme effectively addresses multi-access caching challenges in combination networks.
- The scheme's performance approaches theoretical limits, with the gap narrowing as cache ratios increase.
- This research contributes to more efficient data delivery in distributed caching systems.
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