A Two-Layer Caching Model for Content Delivery Services in Satellite-Terrestrial Networks

Wu, Hao; Li, Jian; Lu, Hancheng; Hong, Peilin

doi:10.1109/glocom.2016.7841557

Cited by 69 publications

(46 citation statements)

References 10 publications

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“…The second constraints accounts for the discrete nature of the optimization variable. Solving exactly the optimization problem requires evaluating (9), which is complex. Hence, as an alternative to minimizing the average backhaul transmission rate, we propose minimizing its upper bound in (23), which leads to the following optimization problem…”

Section: Lrfc Placement Optimization Problemmentioning

confidence: 99%

Caching in heterogeneous satellite networks with fountain codes

Recayte

Lázaro

Liva

2019

Satell Commun Network

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In this paper we investigate the performance of caching schemes based on fountain codes in a heterogeneous satellite network. We consider multiple cache-aided hubs which are connected to a geostationary satellite through backhaul links. With the aim of reducing the average number of transmissions over the satellite backhaul link, we propose the use of a caching scheme based on fountain codes. We derive a simple analytical expression of the average backhaul transmission rate and provide a tight upper bound on it. Furthermore, we show how the performance of the fountain code based caching scheme is similar to that of a caching scheme based on maximum distance separable codes.

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Section: Lrfc Placement Optimization Problemmentioning

confidence: 99%

Caching in heterogeneous satellite networks with fountain codes

Recayte

Lázaro

Liva

2019

Satell Commun Network

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“…Caching optimization has been investigated in recent works for different kinds of heterogeneous networks. In [13] a two layer caching model that aims at minimizing the satellite bandwidth consumption by storing information both at ground stations and at the satellite is proposed. In [14] the authors consider cache-enable unmanned aerial vehicles (UAV) and study the optimal location, cache content and user-UAV association with the aim to maximize users' quality of experience while minimizing the transmit power.…”

Section: A Related Workmentioning

confidence: 99%

Caching in Heterogeneous Networks With Per-File Rate Constraints

Recayte

Cocco

2019

IEEE Trans. Commun.

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We study the problem of caching optimization in heterogeneous networks with mutual interference and per-file rate constraints from an energy efficiency perspective. A setup is considered in which two cache-enabled transmitter nodes and a coordinator node serve two users. We analyse and compare two approaches: (i) a cooperative approach where each of the transmitters might serve either of the users and (ii) a noncooperative approach in which each transmitter serves only the respective user. We formulate the cache allocation optimization problem so that the overall system power consumption is minimized while the use of the link from the master node to the end users is spared whenever possible. We also propose a lowcomplexity optimization algorithm and show that it outperforms the considered benchmark strategies.Our results indicate that significant gains both in terms of power saving and sparing of master node's resources can be obtained when full cooperation between the transmitters is in place. Interestingly, we show that in some cases storing the most popular files is not the best solution from a power efficiency perspective.

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“…Another kind of solution is caching. Wu et al propose a solution to minimise both the uplink and downlink bandwidth consumption. This solution consists of 3 parts: a combined utilisation of caches in the satellite and in the ground stations, an aggregation of the requests at the satellite level, and an optimised caching strategy.…”

Section: Related Workmentioning

confidence: 99%

QoE enhancements on satellite networks through the use of caches

Thibaud

Fasson

Arnal

et al. 2018

Satell Commun Network

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Recent communication improvements mainly target increasing bandwidth. However, high bitrate does not necessarily translate to a good Quality of Experience (QoE) for end users. Indeed, the Quality of Service (QoS) criteria that impact the QoE may differ according to the applications. For instance, a high latency impairs the QoE of web browsing users. Satellite networks effectively illustrate this principle. These networks offer major advantages: They can feed a very large number of users, propose a high bandwidth, and have low deployment costs. But they also have one significant disadvantage: Due to their location, users suffer a latency of around 500 ms (we focus on geostationary satellites in our study). This latency has a harmful impact in term of QoE. Satellite end users may be disappointed by their so-called high-speed Internet, when they experience a lack of responsiveness.The competition between the increasing number of over-the-top services has actually led to an escalation towards the best QoE. For these services, a massive use of content delivery networks (CDN) is unavoidable. Content delivery networks solutions mainly rely on caching the content as close as possible to the end user and redirecting users' requests. 1Taking into account CDN capacities in the field of communications satellites (satcom) is a necessary step to improve users' QoE. As we will see, this deployment can match the competitiveness of terrestrial networks. Therefore, we propose in this paper to deploy a CDN in a satellite network and to study its impact on the experience of the end users. We set the study in a backhaul context where the satellite may feed home networks (HNs) or 5G small cells. Although we discuss numerous questions about the location of caches, the targeted applications, the type of stored content or the caching policy, we choose to focus on a proof of concept through measures based on an open-source testbed (OpenSAND) and a real satellite system. The results highlight an increase in QoE for both web browsing and video streaming. Nevertheless, the transparent caching for video streaming over HTTP, ie, dynamic adaptive streaming over HTTP (DASH), may induce poor performances in some cases. Thus, we propose a solution to improve the transparent caching and address cache misuses. The contribution of this paper are summarised as follows:• We study the impact of the use of CDN on the QoE of satellite end users.• We run our evaluation on an emulation and a real satellite testbed to emphasise our conclusions.• We study several applications that reflect the current Internet usages (web browsing, video streaming and peer to peer [P2P]).• We successfully solve a misuse of caching detected during the evaluation.The remaining sections of this paper are organised as follows. In Section 2, we provide some background information and related work. Then Section 3 discusses the different solutions for deploying a CDN in a satellite context, and Section 4 presents the testbeds and the use cases that have been selected for this study. ...

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A Two-Layer Caching Model for Content Delivery Services in Satellite-Terrestrial Networks

Cited by 69 publications

References 10 publications

Caching in heterogeneous satellite networks with fountain codes

Caching in heterogeneous satellite networks with fountain codes

Caching in Heterogeneous Networks With Per-File Rate Constraints

QoE enhancements on satellite networks through the use of caches

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