Cost-Effective Cache Deployment in Mobile Heterogeneous Networks

Zhang, Shan; Zhang, Ning; Yang, Peng; Shen, Xuemin

doi:10.1109/tvt.2017.2724547

Cited by 62 publications

(32 citation statements)

References 42 publications

(52 reference statements)

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“…In Fig. 3, we present the numerical results of derived expressions for ESR derived in (28) and (29) under varying QoS requirements. As γ s and γ m grow, though the STP decreases, the ESR increases.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…where k 1 = Proof: Please refer to Appendix A. Based on the derived expressions for STP, the ESRs can be obtained as in (28) and (29) shown in the top of the next page. By substituting (28) and (29) into (16), the expression for ECE is obtained.…”

Section: Theorem 2 By Applying Stochastic Geometry the Stps Of Coopmentioning

confidence: 99%

“…This is because these researches only intended to enhance the system performance, while the huge resource cost was not taken into consideration. To this end, EConomical Efficiency (ECE) is recommended as an important design metric [26]- [28], which is able to balance the network revenue and resource cost. The ECE has been studied in the literature.…”

Section: Introductionmentioning

confidence: 99%

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Economical Caching for Scalable Videos in Cache-Enabled Heterogeneous Networks

Zhang

Ren

et al. 2019

IEEE J. Select. Areas Commun.

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We develop the optimal economical caching schemes in cache-enabled heterogeneous networks, while delivering multimedia video services with personalized viewing qualities to mobile users. By applying scalable video coding (SVC), each video file to be requested is divided into one base layer (BL) and several enhancement layers (ELs). In order to assign different transmission tasks, the serving small-cell base stations (SBSs) are grouped into K clusters. The SBSs are able to cache and cooperatively transmit BL and EL contents to the user. We analytically derive the expressions for successful transmission probability and ergodic service rate, and then the closed form of EConomical Efficiency (ECE) is obtained. In order to enhance the ECE performance, we formulate the ECE optimization problems for two cases. In the first case, with equal cache size equipped at each SBS, the layer caching indicator is determined. Since this problem is NP-hard, after the l0-norm approximation, the discrete optimization variables are relaxed to be continuous, and this relaxed problem is convex. Next, based on the optimal solution derived from the relaxed problem, we devise a greedystrategy based heuristic algorithm to achieve the near-optimal layer caching indicators. In the second case, the cache size for each SBS, the layer size and the layer caching indicator are jointly optimized. This problem is a mixed integer programming problem, which is more challenging. To effectively solve this problem, the original ECE maximization problem is divided into two subproblems. These two subproblems are iteratively solved until the original optimization problem is convergent. Numerical results verify the correctness of theoretical derivations. Additionally, compared to the most popular layer placement strategy, the performance superiority of the proposed SVC-based caching schemes is testified.Index Terms-EConomical Efficiency (ECE), heterogeneous networks, layer caching indicator, scalable video coding (SVC), wireless caching.

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Section: Simulation Resultsmentioning

confidence: 99%

Section: Theorem 2 By Applying Stochastic Geometry the Stps Of Coopmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Economical Caching for Scalable Videos in Cache-Enabled Heterogeneous Networks

Zhang

Ren

et al. 2019

IEEE J. Select. Areas Commun.

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“…For multi-tier heterogeneous networks, an iterative heuristic content placement algorithm has been proposed, where each network tier makes decisions based on the contents cached at other tiers [32]. Furthermore, the long-term cache instance deployment problem has been studied to determine the optimal cache size of SBSs and MBSs for the given storage resource budget, where the SBS-tier cache the most popular contents and the MBS-tier cache the less popular ones for load balance [33]. Very recent works have explored the cooperative caching in user-centric clustered networks [20], [21], where insightful analytical results have been obtained on the tradeoff between caching diversity and channel diversity.…”

Section: Literature Reviewmentioning

confidence: 99%

Cooperative Edge Caching in User-Centric Clustered Mobile Networks

Zhang

Suto

et al. 2018

IEEE Trans. on Mobile Comput.

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240

102

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Abstract-With files proactively stored at base stations (BSs), mobile edge caching enables direct content delivery without remote file fetching, which can reduce the end-to-end delay while relieving backhaul pressure. To effectively utilize the limited cache size in practice, cooperative caching can be leveraged to exploit caching diversity, by allowing users served by multiple base stations under the emerging user-centric network architecture. This paper explores delay-optimal cooperative edge caching in large-scale user-centric mobile networks, where the content placement and cluster size are optimized based on the stochastic information of network topology, traffic distribution, channel quality, and file popularity. Specifically, a greedy content placement algorithm is proposed based on the optimal bandwidth allocation, which can achieve (1 − 1/e)-optimality with linear computational complexity. In addition, the optimal user-centric cluster size is studied, and a condition constraining the maximal cluster size is presented in explicit form, which reflects the tradeoff between caching diversity and spectrum efficiency. Extensive simulations are conducted for analysis validation and performance evaluation. Numerical results demonstrate that the proposed greedy content placement algorithm can reduce the average file transmission delay up to 45% compared with the non-cooperative and hit-ratio-maximal schemes. Furthermore, the optimal clustering is also discussed considering the influences of different system parameters.

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“…Generally, the long-term evolution (LTE) can provide reliable access to the Internet for VN communications in the urban areas. However, LTE network has poor coverage in rural areas and highways due to the costly network infrastructure [2,3]. Moreover, the high mobility of vehicles can suffer from frequent handovers as the networks become even denser.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Space Information Networks with Backbone Satellite Relaying for Vehicular Networks

Jiao

Gao

et al. 2017

Wireless Communications and Mobile Computing

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Space Information Network (SIN) with backbone satellites relaying for vehicular network (VN) communications is regarded as an effective strategy to provide diverse vehicular services in a seamless, efficient, and cost-effective manner in rural areas and highways. In this paper, we investigate the performance of SIN return channel cooperative communications via an amplify-andforward (AF) backbone satellite relaying for VN communications, where we assume that both of the source-destination and relaydestination links undergo Shadowed-Rician fading and the source-relay link follows Rician fading, respectively. In this SIN-assisted VN communication scenario, we first obtain the approximate statistical distributions of the equivalent end-to-end signal-to-noise ratio (SNR) of the system. Then, we derive the closed-form expressions to efficiently evaluate the average symbol error rate (ASER) of the system. Furthermore, the ASER expressions are taking into account the effect of satellite perturbation of the backbone relaying satellite, which reveal the accumulated error of the antenna pointing error. Finally, simulation results are provided to verify the accuracy of our theoretical analysis and show the impact of various parameters on the system performance.

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Cost-Effective Cache Deployment in Mobile Heterogeneous Networks

Cited by 62 publications

References 42 publications

Economical Caching for Scalable Videos in Cache-Enabled Heterogeneous Networks

Economical Caching for Scalable Videos in Cache-Enabled Heterogeneous Networks

Cooperative Edge Caching in User-Centric Clustered Mobile Networks

Performance Analysis of Space Information Networks with Backbone Satellite Relaying for Vehicular Networks

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