The Experts below are selected from a list of 1308 Experts worldwide ranked by ideXlab platform
Honghai Zhang - One of the best experts on this subject based on the ideXlab platform.
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CellSlice: Cellular wireless resource slicing for active RAN sharing
2013 5th International Conference on Communication Systems and Networks COMSNETS 2013, 2013Co-Authors: Ravi Kokku, Rajesh Mahindra, Honghai Zhang, Sampath RangarajanAbstract:We present the design and implementation of Cell-Slice, a novel system for slicing wireless resources in a cellular network for effective Radio Access Network (RAN) sharing. CellSlice is a gateway-level solution that achieves the slicing without modifying the Basestations' MAC schedulers, thereby significantly reducing the barrier for its adoption. Achieving slicing with a gateway-level solution is challenging, however, since resource scheduling decisions occur at the Basestations at fine timescales, and these decisions are not visible at the gateways. In the uplink direction, CellSlice overcomes the challenge by indirectly constraining the uplink scheduler's decisions using a simple feedback-based adaptation algorithm. For downlink, we build on the technique used by NVS, a native Basestation virtualization solution, and show that effective downlink slicing can be easily achieved without modifying Basestation schedulers. We instantiate a prototype of CellSlice on a Picochip WiMAX testbed. Through both prototype evaluation and simulations, we demonstrate that CellSlice's performance for both remote uplink and remote downlink slicing is close to that of NVS. CellSlice's design is access-technology independent, and hence can be equally applicable to LTE, LTE-Advanced and WiMAX networks.
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Radio Access Network sharing in cellular networks
2013 21st IEEE International Conference on Network Protocols (ICNP), 2013Co-Authors: Rajesh Mahindra, Mohammad Amir Khojastepour, Honghai Zhang, Sampath RangarajanAbstract:—Mobile operators are witnessing a dramatic increase in traffic spurred by a combination of popularity of smart-phones, innovative applications and diverse services. As mobile traffic transitions from being voice dominated to video and data dominated, the revenue per byte for the mobile operators is declining at an unhealthy rate. To counter the traffic growth and build cost-effective networks, many operators are now forging alliances for RAN (Radio Access Network) sharing to improve coverage and capacity at reasonable investments and operational costs. This paper presents the design and implementation of NetShare, a network-wide radio resource management framework that provides effective RAN Sharing. NetShare introduces a novel two-level scheduler split between the mobile gateway and the cellular Basestations to effectively manage and allocate the wireless resources of the radio access network composed of multiple Basestations among multiple different entities (such as operators, content providers, etc.) that share the network. Firstly, NetShare provides performance isolation across entities with a minimum guaranteed resource allocation to each entity across the network. Secondly, NetShare optimally distributes the resources to each entity across the network proportional to the resource demand at each Basestation. Through extensive LTE-based system simulations and prototype evaluations on a WiMAX testbed, we show the efficacy of NetShare in (a) providing isolation across entities and (b) efficiently distributing resources for each entity across the network thus achieving high utilization of resources for an entity.
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opportunistic alignment of advertisement delivery with cellular Basestation overloads
International Conference on Mobile Systems Applications and Services, 2011Co-Authors: Ravi Kokku, Sampath Rangarajan, Rajesh Mahindra, Honghai ZhangAbstract:This paper is motivated by two observations: (1) cellular network operators are actively exploring advertisement delivery as a new means of revenue generation, and (2) cellular Basestations perceive intermittent overloads at different times of day. Bringing the two observations together, we design and implement Opal, a novel system for opportunistically aligning advertisement delivery with Basestation overload. Such alignment improves the overall perception of network availability for users. To achieve the alignment systematically, Opal builds on an analytical framework for tunable unavailability of network service to users during overload. At the same time, if the network is not overloaded enough during a certain period, Opal schedules enough advertisements to satisfy the advertisement delivery contracts. Opal minimizes the amount of state to be maintained to play advertisements to users uniformly and also maximizes the number of viewers for each advertisement. We implement a prototype of Opal on a Picochip based WiMAX testbed, and demonstrate its efficacy using simulations, analysis and prototype evaluation.
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demo a system for aligning advertisement delivery with cellular Basestation overloads
International Conference on Mobile Systems Applications and Services, 2011Co-Authors: Ravi Kokku, Sampath Rangarajan, Rajesh Mahindra, Honghai ZhangAbstract:We demonstrate OPAL [2]- a system for opportunistically aligning advertisement delivery with Basestation overload periods, which reduces the total number of times network service is unavailable to users. This system is motivated by two trends: Firstly, as networks get dominated by non-elastic traffic such as video, overload management using admission control will be imminent, thereby exposing network unavailability to users. Secondly, as mobile advertising is rapidly growing, mobile network operators are increasingly interested in leveraging its huge revenue potential, and are also better equipped than any other entity in reaching the users.
Sampath Rangarajan - One of the best experts on this subject based on the ideXlab platform.
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CellSlice: Cellular wireless resource slicing for active RAN sharing
2013 5th International Conference on Communication Systems and Networks COMSNETS 2013, 2013Co-Authors: Ravi Kokku, Rajesh Mahindra, Honghai Zhang, Sampath RangarajanAbstract:We present the design and implementation of Cell-Slice, a novel system for slicing wireless resources in a cellular network for effective Radio Access Network (RAN) sharing. CellSlice is a gateway-level solution that achieves the slicing without modifying the Basestations' MAC schedulers, thereby significantly reducing the barrier for its adoption. Achieving slicing with a gateway-level solution is challenging, however, since resource scheduling decisions occur at the Basestations at fine timescales, and these decisions are not visible at the gateways. In the uplink direction, CellSlice overcomes the challenge by indirectly constraining the uplink scheduler's decisions using a simple feedback-based adaptation algorithm. For downlink, we build on the technique used by NVS, a native Basestation virtualization solution, and show that effective downlink slicing can be easily achieved without modifying Basestation schedulers. We instantiate a prototype of CellSlice on a Picochip WiMAX testbed. Through both prototype evaluation and simulations, we demonstrate that CellSlice's performance for both remote uplink and remote downlink slicing is close to that of NVS. CellSlice's design is access-technology independent, and hence can be equally applicable to LTE, LTE-Advanced and WiMAX networks.
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Radio Access Network sharing in cellular networks
2013 21st IEEE International Conference on Network Protocols (ICNP), 2013Co-Authors: Rajesh Mahindra, Mohammad Amir Khojastepour, Honghai Zhang, Sampath RangarajanAbstract:—Mobile operators are witnessing a dramatic increase in traffic spurred by a combination of popularity of smart-phones, innovative applications and diverse services. As mobile traffic transitions from being voice dominated to video and data dominated, the revenue per byte for the mobile operators is declining at an unhealthy rate. To counter the traffic growth and build cost-effective networks, many operators are now forging alliances for RAN (Radio Access Network) sharing to improve coverage and capacity at reasonable investments and operational costs. This paper presents the design and implementation of NetShare, a network-wide radio resource management framework that provides effective RAN Sharing. NetShare introduces a novel two-level scheduler split between the mobile gateway and the cellular Basestations to effectively manage and allocate the wireless resources of the radio access network composed of multiple Basestations among multiple different entities (such as operators, content providers, etc.) that share the network. Firstly, NetShare provides performance isolation across entities with a minimum guaranteed resource allocation to each entity across the network. Secondly, NetShare optimally distributes the resources to each entity across the network proportional to the resource demand at each Basestation. Through extensive LTE-based system simulations and prototype evaluations on a WiMAX testbed, we show the efficacy of NetShare in (a) providing isolation across entities and (b) efficiently distributing resources for each entity across the network thus achieving high utilization of resources for an entity.
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opportunistic alignment of advertisement delivery with cellular Basestation overloads
International Conference on Mobile Systems Applications and Services, 2011Co-Authors: Ravi Kokku, Sampath Rangarajan, Rajesh Mahindra, Honghai ZhangAbstract:This paper is motivated by two observations: (1) cellular network operators are actively exploring advertisement delivery as a new means of revenue generation, and (2) cellular Basestations perceive intermittent overloads at different times of day. Bringing the two observations together, we design and implement Opal, a novel system for opportunistically aligning advertisement delivery with Basestation overload. Such alignment improves the overall perception of network availability for users. To achieve the alignment systematically, Opal builds on an analytical framework for tunable unavailability of network service to users during overload. At the same time, if the network is not overloaded enough during a certain period, Opal schedules enough advertisements to satisfy the advertisement delivery contracts. Opal minimizes the amount of state to be maintained to play advertisements to users uniformly and also maximizes the number of viewers for each advertisement. We implement a prototype of Opal on a Picochip based WiMAX testbed, and demonstrate its efficacy using simulations, analysis and prototype evaluation.
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demo a system for aligning advertisement delivery with cellular Basestation overloads
International Conference on Mobile Systems Applications and Services, 2011Co-Authors: Ravi Kokku, Sampath Rangarajan, Rajesh Mahindra, Honghai ZhangAbstract:We demonstrate OPAL [2]- a system for opportunistically aligning advertisement delivery with Basestation overload periods, which reduces the total number of times network service is unavailable to users. This system is motivated by two trends: Firstly, as networks get dominated by non-elastic traffic such as video, overload management using admission control will be imminent, thereby exposing network unavailability to users. Secondly, as mobile advertising is rapidly growing, mobile network operators are increasingly interested in leveraging its huge revenue potential, and are also better equipped than any other entity in reaching the users.
Rajesh Mahindra - One of the best experts on this subject based on the ideXlab platform.
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CellSlice: Cellular wireless resource slicing for active RAN sharing
2013 5th International Conference on Communication Systems and Networks COMSNETS 2013, 2013Co-Authors: Ravi Kokku, Rajesh Mahindra, Honghai Zhang, Sampath RangarajanAbstract:We present the design and implementation of Cell-Slice, a novel system for slicing wireless resources in a cellular network for effective Radio Access Network (RAN) sharing. CellSlice is a gateway-level solution that achieves the slicing without modifying the Basestations' MAC schedulers, thereby significantly reducing the barrier for its adoption. Achieving slicing with a gateway-level solution is challenging, however, since resource scheduling decisions occur at the Basestations at fine timescales, and these decisions are not visible at the gateways. In the uplink direction, CellSlice overcomes the challenge by indirectly constraining the uplink scheduler's decisions using a simple feedback-based adaptation algorithm. For downlink, we build on the technique used by NVS, a native Basestation virtualization solution, and show that effective downlink slicing can be easily achieved without modifying Basestation schedulers. We instantiate a prototype of CellSlice on a Picochip WiMAX testbed. Through both prototype evaluation and simulations, we demonstrate that CellSlice's performance for both remote uplink and remote downlink slicing is close to that of NVS. CellSlice's design is access-technology independent, and hence can be equally applicable to LTE, LTE-Advanced and WiMAX networks.
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Radio Access Network sharing in cellular networks
2013 21st IEEE International Conference on Network Protocols (ICNP), 2013Co-Authors: Rajesh Mahindra, Mohammad Amir Khojastepour, Honghai Zhang, Sampath RangarajanAbstract:—Mobile operators are witnessing a dramatic increase in traffic spurred by a combination of popularity of smart-phones, innovative applications and diverse services. As mobile traffic transitions from being voice dominated to video and data dominated, the revenue per byte for the mobile operators is declining at an unhealthy rate. To counter the traffic growth and build cost-effective networks, many operators are now forging alliances for RAN (Radio Access Network) sharing to improve coverage and capacity at reasonable investments and operational costs. This paper presents the design and implementation of NetShare, a network-wide radio resource management framework that provides effective RAN Sharing. NetShare introduces a novel two-level scheduler split between the mobile gateway and the cellular Basestations to effectively manage and allocate the wireless resources of the radio access network composed of multiple Basestations among multiple different entities (such as operators, content providers, etc.) that share the network. Firstly, NetShare provides performance isolation across entities with a minimum guaranteed resource allocation to each entity across the network. Secondly, NetShare optimally distributes the resources to each entity across the network proportional to the resource demand at each Basestation. Through extensive LTE-based system simulations and prototype evaluations on a WiMAX testbed, we show the efficacy of NetShare in (a) providing isolation across entities and (b) efficiently distributing resources for each entity across the network thus achieving high utilization of resources for an entity.
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opportunistic alignment of advertisement delivery with cellular Basestation overloads
International Conference on Mobile Systems Applications and Services, 2011Co-Authors: Ravi Kokku, Sampath Rangarajan, Rajesh Mahindra, Honghai ZhangAbstract:This paper is motivated by two observations: (1) cellular network operators are actively exploring advertisement delivery as a new means of revenue generation, and (2) cellular Basestations perceive intermittent overloads at different times of day. Bringing the two observations together, we design and implement Opal, a novel system for opportunistically aligning advertisement delivery with Basestation overload. Such alignment improves the overall perception of network availability for users. To achieve the alignment systematically, Opal builds on an analytical framework for tunable unavailability of network service to users during overload. At the same time, if the network is not overloaded enough during a certain period, Opal schedules enough advertisements to satisfy the advertisement delivery contracts. Opal minimizes the amount of state to be maintained to play advertisements to users uniformly and also maximizes the number of viewers for each advertisement. We implement a prototype of Opal on a Picochip based WiMAX testbed, and demonstrate its efficacy using simulations, analysis and prototype evaluation.
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demo a system for aligning advertisement delivery with cellular Basestation overloads
International Conference on Mobile Systems Applications and Services, 2011Co-Authors: Ravi Kokku, Sampath Rangarajan, Rajesh Mahindra, Honghai ZhangAbstract:We demonstrate OPAL [2]- a system for opportunistically aligning advertisement delivery with Basestation overload periods, which reduces the total number of times network service is unavailable to users. This system is motivated by two trends: Firstly, as networks get dominated by non-elastic traffic such as video, overload management using admission control will be imminent, thereby exposing network unavailability to users. Secondly, as mobile advertising is rapidly growing, mobile network operators are increasingly interested in leveraging its huge revenue potential, and are also better equipped than any other entity in reaching the users.
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Virtual Basestation: Architecture for an Open Shared WiMAX Framework
Proceedings of the Second ACM SIGCOMM Workshop on Virtualized Infrastructure Systems and Architectures, 2010Co-Authors: Gautam Bhanage, Ivan Seskar, Rajesh Mahindra, Dipankar RaychaudhuriAbstract:This paper presents the architecture and performance eval- uation of a virtualized wide-area 4G cellular wireless net- work. Specifically, it addresses the challenges of virtualiza- tion of resources in a cellular base station to enable shared use by multiple independent slice users (experimenters or mobile virtual network operators), each with possibly dis- tinct flow types and network layer protocols. The proposed virtual Basestation architecture is based on an external sub- strate which uses a layer-2 switched datapath, and an ar- bitrated control path to the WiMAX base station. The framework implements virtualization of base stations ra- dio resources to achieve isolation between multiple virtual networks. An algorithm for weighted fair sharing among multiple slices based on an airtime fairness metric has been implemented for the first release. Preliminary experimen- tal results from the virtual Basestation prototype are given, demonstrating mobile network performance, isolation across slices with different flow types, and custom flow scheduling capabilities.
Terence D Todd - One of the best experts on this subject based on the ideXlab platform.
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Basestation collaboration in bluetooth voice networks
Computer Networks, 2003Co-Authors: Jingxin Xue, Terence D ToddAbstract:In the near future Bluetooth may be embedded into many different types of mobile and portable devices [IEEE Personal Commun. 7 (1) (2000)]. This connectivity will enable a variety of future picocellular services such as real-time voice and data [Specification of the Bluetooth System 1.0b., Bluetooth Special Interest Group, 1999]. In this paper, we consider several Bluetooth-based telephony access point designs. Since the number of SCO links per Bluetooth node is very limited, the designs consider the use of multiple overlapping Bluetooth Basestations or module coverage areas. The first scheme is a direct implementation of the telephony profile where the Bluetooth Basestations/modules operate independently, without any coordination. The paper proposes several schemes which use a variety of techniques for reducing the call blocking rate using real-time communication between the Basestations or Bluetooth modules. It is shown that significant improvements in blocking performance are possible using this approach. A constraint on the design of high-capacity voice access points is the potential packet loss experienced by overlapping SCO transmissions. The paper includes a worse-case characterization and discussion of Bluetooth's shortcomings in this regard.
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Basestation collaboration in bluetooth voice networks
Local Computer Networks, 2001Co-Authors: Jingxin Xue, Terence D ToddAbstract:In the near future Bluetooth will be embedded into many different types of mobile and portable devices. Initially this will provide simple wire replacement functions for applications such as hands-free headsets for cellular radio. However, this will also enable future picocellular services such as real-time voice and data. There are many possible applications for this such as telephone lounges in airports, shopping malls and other public places. We consider several Bluetooth-based telephony Basestation (BS) designs. Since the number of SCO links per Bluetooth node is very limited, the designs consider the use of multiple overlapping Bluetooth Basestations/chips. The first scheme is a direct implementation of the telephony profile where the Bluetooth Basestations operate independently, without any coordination. When a mobile comes within range of the system, it associates with a Basestation using the normal inquiry/page process. The second scheme, BBSM (Bluetooth Basestation with migration), reduces the probability of blocking by having mobile nodes re-associate with available Basestations when their current Basestation is about to become blocked by SCO links. This improves the performance of the system from a blocking standpoint, but can be very spectrally wasteful. The third design, BBSS (Bluetooth Basestation with standby), further improves blocking performance and decreases the wasteful effects of "node migration storms" which can occur in BBSM. We also include results for a design which uses ACL-based voice links. This scheme gives the best performance but has the disadvantage that more complex vocoding is required.
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dynamic slot allocation dsa in indoor sdma tdma using a smart antenna Basestation
IEEE ACM Transactions on Networking, 2001Co-Authors: Faisal Shad, Terence D Todd, Vytas Kezys, John LitvaAbstract:We introduce and study the use of dynamic slot allocation (DSA) in packet-switched space-division-multiple-access (SDMA) systems. In conventional SDMA, a smart antenna is used at the Basestation to simultaneously communicate with multiple stations on the same frequency channel. When dynamic slot allocation is added, the Basestation uses uplink channel measurements to intelligently construct future SDMA/TDMA frames. It is shown that under a simple minimum signal-to-interference-plus-noise ratio (SINR) constraint, the problem of performing optimal dynamic slot allocation is NP-complete. Heuristic slot allocation algorithms are introduced which are capable of greatly increasing SDMA/TDMA frame capacity compared with a random allocation of stations. The paper uses both theoretical results and measured data from an experimental testbed to characterize the performance of dynamic slot allocation. The experimental system operates at a carrier frequency of 1.86 GHz and uses an eight-element circular antenna array. It is demonstrated that significant increases in system capacity are possible using DSA in the indoor situations that were tested. Dynamic slot allocation requires the channel to be essentially constant from the time that channel measurements are made until the SDMA/TDMA frame is transmitted. We also present channel measurements which show the effects of channel time coherence in the presence of indoor pedestrian movement. This and other results we have taken suggest that dynamic slot allocation is possible at the frequency considered, provided turnaround times are in the low-to-mid tens of milliseconds.
Ravi Kokku - One of the best experts on this subject based on the ideXlab platform.
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CellSlice: Cellular wireless resource slicing for active RAN sharing
2013 5th International Conference on Communication Systems and Networks COMSNETS 2013, 2013Co-Authors: Ravi Kokku, Rajesh Mahindra, Honghai Zhang, Sampath RangarajanAbstract:We present the design and implementation of Cell-Slice, a novel system for slicing wireless resources in a cellular network for effective Radio Access Network (RAN) sharing. CellSlice is a gateway-level solution that achieves the slicing without modifying the Basestations' MAC schedulers, thereby significantly reducing the barrier for its adoption. Achieving slicing with a gateway-level solution is challenging, however, since resource scheduling decisions occur at the Basestations at fine timescales, and these decisions are not visible at the gateways. In the uplink direction, CellSlice overcomes the challenge by indirectly constraining the uplink scheduler's decisions using a simple feedback-based adaptation algorithm. For downlink, we build on the technique used by NVS, a native Basestation virtualization solution, and show that effective downlink slicing can be easily achieved without modifying Basestation schedulers. We instantiate a prototype of CellSlice on a Picochip WiMAX testbed. Through both prototype evaluation and simulations, we demonstrate that CellSlice's performance for both remote uplink and remote downlink slicing is close to that of NVS. CellSlice's design is access-technology independent, and hence can be equally applicable to LTE, LTE-Advanced and WiMAX networks.
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opportunistic alignment of advertisement delivery with cellular Basestation overloads
International Conference on Mobile Systems Applications and Services, 2011Co-Authors: Ravi Kokku, Sampath Rangarajan, Rajesh Mahindra, Honghai ZhangAbstract:This paper is motivated by two observations: (1) cellular network operators are actively exploring advertisement delivery as a new means of revenue generation, and (2) cellular Basestations perceive intermittent overloads at different times of day. Bringing the two observations together, we design and implement Opal, a novel system for opportunistically aligning advertisement delivery with Basestation overload. Such alignment improves the overall perception of network availability for users. To achieve the alignment systematically, Opal builds on an analytical framework for tunable unavailability of network service to users during overload. At the same time, if the network is not overloaded enough during a certain period, Opal schedules enough advertisements to satisfy the advertisement delivery contracts. Opal minimizes the amount of state to be maintained to play advertisements to users uniformly and also maximizes the number of viewers for each advertisement. We implement a prototype of Opal on a Picochip based WiMAX testbed, and demonstrate its efficacy using simulations, analysis and prototype evaluation.
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demo a system for aligning advertisement delivery with cellular Basestation overloads
International Conference on Mobile Systems Applications and Services, 2011Co-Authors: Ravi Kokku, Sampath Rangarajan, Rajesh Mahindra, Honghai ZhangAbstract:We demonstrate OPAL [2]- a system for opportunistically aligning advertisement delivery with Basestation overload periods, which reduces the total number of times network service is unavailable to users. This system is motivated by two trends: Firstly, as networks get dominated by non-elastic traffic such as video, overload management using admission control will be imminent, thereby exposing network unavailability to users. Secondly, as mobile advertising is rapidly growing, mobile network operators are increasingly interested in leveraging its huge revenue potential, and are also better equipped than any other entity in reaching the users.