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2019 IEEE Wireless Communications and Networking Conference (WCNC) / Institute of Electrical and Electronics Engineers.
- Format:
- Book
- Author/Creator:
- Institute of Electrical and Electronics Engineers, author, issuing body.
- Language:
- English
- Subjects (All):
- Wireless communication systems--Congresses.
- Wireless communication systems.
- Physical Description:
- 1 online resource
- Other Title:
- 2019 IEEE Wireless Communications and Networking Conference
- Place of Publication:
- Piscataway, New Jersey : IEEE, 2019.
- Summary:
- Caching the content closer to the user equipments (UEs) in heterogenous cellular networks (HetNets) improves user-perceived Quality-of-Service (QoS) while lowering the operators backhaul usage/costs. Nevertheless, under the current networking strategy that promotes aggressive densification, it is unclear whether cache-enabled HetNets preserve the claimed cost-effectiveness and the potential benefits. This is due to 1. the collective cost of caching which may inevitably exceed the expensive cost of backhaul in a dense HetNet, and 2. the excessive interference which affects the signal reception irrespective of content placement. We analyze these significant, yet overlooked, issues, showing that while densification reduces backhaul load and increases spectral efficiency in cache-enabled dense networks, it simultaneously reduces cache-hit probability and increases the network cost. We then introduce a caching efficiency metric, area spectral efficiency per unit spent cost, and find it enough to cache only about 3% of the content library size in the cache of small-cell base stations. We further show that range expansion, known to be of substantial value in wireless networks, is almost impotent to curb the caching inefficiency. Surprisingly, unlike the conventional wisdom recommending traffic offloading from macro cells to small cells, in cache-enabled HetNets, it is more beneficial to exclude offloading altogether or to do the opposite.
- Notes:
- Description based on publisher supplied metadata and other sources.
- ISBN:
- 1-5386-7646-X
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