HetNets With Random DTX Scheme: Local Delay and Energy Efficiency

Increasing spatio-temporal correlation in the data demand makes it attractive to cache popular content directly on the user devices so that it can be delivered on demand to the neighboring devices through device-to-device (D2D) communications. Due to the limited storage capacity, each device can only cache a part of the popular content resulting in a distributed caching network. With device locations modeled as a Poisson Point Process (PPP), we assume that the file of interest for a typical device is partitioned into several file portions with each device caching one of the portions randomly. Two equivalent viewpoints for the analysis of coverage probability and average delay in a distributed caching network are discussed for varying cache probabilities and device activity factors.

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“…The result follows directly from Theorem 1 in [10] using suitable limits of integration for the outside and inside interference.…”

Section: Lemma 5 the Average Delay In Communicating With The Closestmentioning

confidence: 80%

Distributed caching in device-to-device networks: A stochastic geometry perspective

Krishnan

Dhillon

2015

2015 49th Asilomar Conference on Signals, Systems and Computers

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“…The interferences experienced by a user at different slots are usually correlated as they come from the same set of BSs [17]. In [17]- [21], the authors study retransmissions and show that the interference correlation significantly degrades the performance, e.g., the diversity gain [18] or the transmission delay [19]- [21]. In [17]- [21], the authors adopt random discontinuous transmission (DTX) together with retransmissions to effectively manage such interference correlation, by creating randomness for interferers, and analyze the performance in large-scale wireless networks.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Performance of Random Caching in Large-Scale Heterogeneous Wireless Networks With Random Discontinuous Transmission

Wen

Cui

Zheng

et al. 2018

IEEE Trans. Commun.

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To make better use of file diversity provided by random caching and improve the successful transmission probability (STP) of a file, we consider retransmissions with random discontinuous transmission (DTX) in a large-scale cache-enabled heterogeneous wireless network (HetNet) employing random caching. We analyze and optimize the STP in two mobility scenarios, i.e., the high mobility scenario and the static scenario. First, in each scenario, by using tools from stochastic geometry, we obtain a closed-form expression for the STP in the general signal-to-interference ratio (SIR) threshold regime.The analysis shows that a larger caching probability corresponds to a higher STP in both scenarios; random DTX can improve the STP in the static scenario and its benefit gradually diminishes when mobility increases. In each scenario, we also derive a closed-form expression for the asymptotic outage probability in the low SIR threshold regime. The asymptotic analysis shows that the diversity gain is jointly affected by random caching and random DTX in both scenarios. Then, in each scenario, we consider the maximization of the STP with respect to the caching probability and the BS activity probability, which is a challenging non-convex optimization problem. In particular, in the high mobility scenario, we obtain a globally optimal solution using interior point method. In the static scenario, we develop a low-complexity iterative algorithm to obtain a stationary point using alternating optimization.Finally, numerical results show that the proposed solutions achieve significant gains over existing baseline schemes and can well adapt to the changes of the system parameters to wisely utilize storage resources and transmission opportunities. Index TermsRandom caching, retransmission, random discontinuous transmission (DTX), heterogeneous wireless networks, optimization, stochastic geometry.Y. Cui is with the

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“…In [21]- [23], the authors use stochastic geometry tools to analyze the performance of Cell DTx in dense networks. However, in these three papers, the power control is not considered and the transmit power is constant.…”

Section: Introductionmentioning

confidence: 99%

Power Control and Cell Discontinuous Transmission Used As a Means of Decreasing Small-Cell Networks’ Energy Consumption

Bonnefoi

Moy

Palicot

2018

IEEE Trans. on Green Commun. Netw.

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Abstract-In this article, we analyze the issues of power control and Cell Discontinuous Transmission (Cell DTx) in a small-cell network. More precisely, we evaluate the performance of a policy, thanks to which each base station minimizes its own energy consumption. We have recently proposed this policy in a monocell scenario and we extend the scope of our previous work in this article, as we propose to use this policy in a multi-cell network. For that purpose, we first consider a network made of two base stations, in which we can compute the minimum network's energy consumption, which enables to provide users with the requested quality of service. If we compare the proposed policy with this minimum, we can demonstrate that the proposed policy has a good performance, which, however, can be improved by reducing the maximum transmit power of the base station. Then, we apply our algorithm in the case of a dense network, in which the proposed policy outperforms other policies and provides a 6% gain in energy, where compared to a policy featuring no power control. We show that the reduction of the maximum transmit power can increase this gain up to 11% of the network's energy consumption.

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HetNets With Random DTX Scheme: Local Delay and Energy Efficiency

Cited by 37 publications

References 29 publications

Distributed caching in device-to-device networks: A stochastic geometry perspective

Distributed caching in device-to-device networks: A stochastic geometry perspective

Enhancing Performance of Random Caching in Large-Scale Heterogeneous Wireless Networks With Random Discontinuous Transmission

Power Control and Cell Discontinuous Transmission Used As a Means of Decreasing Small-Cell Networks’ Energy Consumption

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