An adaptive bias configuration strategy for range extension in LTE-advanced heterogeneous networks
01 Jan 2011-pp 336-340
TL;DR: Simulation results show that the proposed adaptive bias configuration strategy for RE can improve the cell edge performance compared with the static bias setting strategies, while maintaining the overall cell performance.
Abstract: The coexistence of macro eNodeBs and the additional low power nodes (LPNs) may lead to much higher interference in LTE-Advanced Heterogeneous Networks (HetNets) In Macro Pico scenario, Range Extension (RE) is a promising scheme to utilize the LPN resources more effectively and improve the cell edge performance However, it may introduce more interference if the bias value is not properly set In this paper, an adaptive bias configuration strategy for RE is proposed In this strategy, the bias value is set adaptively according to the environment variability, which contains three stages including bias initialization, system performance feedback and dynamic bias value setting The proposed scheme aims to make the RE scheme adaptive and improve the cell edge users' performance through cell load balance Simulation results show that the proposed scheme can improve the cell edge performance compared with the static bias setting strategies, while maintaining the overall cell performance
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TL;DR: The approach is dynamic, and further improves performance by keeping the HetNet continuously optimized for improved user experience, by adapting the ABS in response to dynamic variations in network load.
Abstract: Enhanced Inter-cell Interference Co-ordination (eICIC) is a time-domain multiplexing technique for improving the performance of legacy co-channel Heterogeneous Networks (HetNets). eICIC offers several benefits, including a more equitable distribution of user traffic across the macro and embedded pico cells (i.e., load balancing), in turn leading to better pico cell utilizations and better edge user throughputs. eICIC uses two mechanisms to achieve load balancing: (i) a cell selection bias to increase the pico coverage area, enabling the pico to attract more users, and (ii) macro muting ("Almost Blank Sub-frame", ABS) to improve SINRs of range extended pico users. Network load in the cellular system varies continuously as a result of user mobility and traffic dynamics (the varying amount of data pending for a user - arising from packet arrivals and eventual departures). Previous work did not consider dynamically changing network conditions in HetNets. Hence, they studied the benefits of eICIC over legacy HetNets arising from static optimization of eICIC parameters. Our approach is dynamic, and further improves performance by keeping the HetNet continuously optimized for improved user experience, by adapting the ABS in response to dynamic variations in network load. We present several analytical formulations, which allow for simple optimizations and an intuitive understanding of the desired system response to load variation. Exhaustive system simulations illustrate the performance gains along different dimensions, such as spectral efficiency, fairness, mean file transfer times, number of file transmissions, number of file drops, and mean queue lengths. Furthermore, we study the impact of different mobility scenarios, traffic mixes, and adaptation rate. We also provide a brief discussion of practical considerations in implementing Dynamic eICIC.
105 citations
Cites methods from "An adaptive bias configuration stra..."
...1536-1276/13$31.00 c© 2013 IEEE Previous work has evaluated: the performance of ICIC [6], cell bias adaptation of eICIC HetNets [7], and the dynamic selection of victim users [8]....
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...This is because, the former comparison subsumes both, static eICIC gains over legacy HetNets, and eICIC adaptation gains, making it harder to isolate the latter gain....
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...In legacy HetNets, user ⇔ base station (BS) associations are via “nominal coverage”, i.e., servingBS(i) = max j RSRPij , where RSRPij refers to the average reference signal received power of user i from BS j....
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...“Enhanced ICIC” (eICIC) is a time-domain solution to load balance co-channel LTE HetNets [5], by offloading macro users to picos. eICIC uses two mechanisms, “Cell Range Extension” and “Almost Blank Subframes”, to achieve its objectives....
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...Previous work has evaluated: the performance of ICIC [6], cell bias adaptation of eICIC HetNets [7], and the dynamic selection of victim users [8]....
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TL;DR: A maiden approach to analyze the performance of a vehicular network with cellular infrastructure as a backbone using mobile Femto Access Points (FAPs) as relays in place of RSUs and shows improvement in terms of delay, throughput, and energy efficiency.
Abstract: A vehicular network with Road Side Units (RSUs) provides an efficient way to connect vehicles even on the move. However, due to high deployment and maintenance cost of RSUs, it is necessary to use fewer RSUs, such that the total cost is minimized. It is suggested that cellular networks, such as Long-Term Evolution (LTE), are capable of fulfilling the demands posed in vehicular network scenarios. Availability of high bandwidth, large coverage area, and low latency are some of the advantages of cellular networks, which help in overcoming the challenges of high-speed vehicular communication. In this paper, we propose a maiden approach to analyze the performance of a vehicular network with cellular infrastructure as a backbone. For this, we use mobile Femto Access Points (FAPs) as relays in place of RSUs. We model the network using $M/M/m$ queue and compare the delay and throughput performance with traditional IEEE 802.11p vehicular networks. We also formulate an optimization problem and propose a subchannel power control algorithm to handle increased co-channel interference, which emerges due to high mobility of vehicles in the network. Our suggested approach shows improvement in terms of delay, throughput, and energy efficiency. The results are verified using extensive simulations.
70 citations
29 Nov 2012
TL;DR: This paper presents an adaptive control cell range expansion (CRE) technique that improves the cell edge user throughput in HetNets, in which user equipment can automatically choose an optimal cell selection offset (CSO).
Abstract: Heterogeneous networks (HetNets) are expected to handle increasing demands for mobile network capacity. This paper presents an adaptive control cell range expansion (CRE) technique that improves the cell edge user throughput in HetNets, in which user equipment (UE) can automatically choose an optimal cell selection offset (CSO). The aspects and algorithm of the proposed CRE are described by comparing them with the conventional method operated by a fixed CSO. Computer simulation results such as average and cell edge user throughput are provided as parameters of the number of UEs. We confirmed that the proposed CRE can improve cell edge user throughput, while maintaining the average user throughput performance. The proposed CRE will play an important role in future mobile communication systems such as LTE-Advanced and beyond.
58 citations
Patent•
08 Jan 2015TL;DR: In this article, the authors proposed a method for managing load balance in cellular heterogeneous networks, which comprises: providing a plurality of spectrum carriers for conveying communication signals to/from a macro cell, where at least one of the carriers is a shared carrier, and the shared carrier is characterized in that data is the only type of communication signals being conveyed thereat when the cellular network is under congestion.
Abstract: A method is provided for managing load balance in cellular heterogeneous networks. The method comprises: providing a plurality of spectrum carriers for conveying communication signals to/from a macro cell. At least one of the carriers is a shared carrier for conveying communication signals to/from the macro cell and to/from at least one small cell located at the geographical vicinity of the macro cell, and wherein the shared carrier is characterized in that data is the only type of communication signals being conveyed thereat when the cellular network is under congestion. One or more other spectrum carriers are dedicated carriers adapted to essentially convey voice calls, and wherein user terminals are steered away from dedicated carriers to the shared carrier, so that when a data session is initiated for a user terminal camped on the shared carrier, that session will be conveyed one or more of the small cells.
34 citations
TL;DR: An overview of the key radio access features and functionalities of the LTE-Advanced radio access network, supported by the simulation results is presented.
Abstract: Long Term Evolution Advanced (LTE-Advanced) is the next step in LTE evolution and allows operators to improve network performance and service capabilities through smooth deployment of new techniques and technologies. LTE-Advanced uses some new features on top of the existing LTE standards to provide better user experience and higher throughputs. Some of the most significant features introduced in LTE-Advanced are carrier aggregation, enhancements in heterogeneous networks, coordinated multipoint transmission and reception, enhanced multiple input multiple output usage and deployment of relay nodes in the radio network. Mentioned features are mainly aimed to enhance the radio access part of the cellular networks. This survey article presents an overview of the key radio access features and functionalities of the LTE-Advanced radio access network, supported by the simulation results. We also provide a detailed review of the literature together with a very rich list of the references for each of the features. An LTE-Advanced roadmap and the latest updates and trends in LTE markets are also presented.
32 citations
Cites background from "An adaptive bias configuration stra..."
...For more discussion, readers may refer to [149-153]....
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