Person: Venkataraman, Hrishikesh
Loading...
Name
Hrishikesh Venkataraman
Job Title
Faculty
Email Address
Telephone
Birth Date
Specialization
8 results
Search Results
Now showing 1 - 8 of 8
Publication Metadata only CASHeW - cluster-based Adaptive Scheme for Multimedia Delivery in Heterogeneous Wireless Networks( li vr e) Poornachand,; Venkataraman, Hrishikesh; Venkataraman, Hrishikesh; DA-IICT, Gandhinagar; Kalyampudi, Poornachand (200501158)Multimedia streaming over heterogeneous wireless networks has attracted significant interest in recent years from both telecom network operators and end users. However, the heterogeneity of the wireless network makes it very difficult to synchronize real-time multimedia streaming to different types of end-user devices across different wireless networks. In addition, with different delay and packet loss across different networks, multimedia delivery over the heterogeneous wireless networks cannot provide good quality streaming video. This paper proposes CASHeW�a novel cluster-based design with an in-built feedback-based adaptive mechanism that results in a higher video perceived quality in two-hop heterogeneous wireless network environments. CASHeW employs a proxy-client-server mechanism between the base station (BS) and the end-user; and importantly uses a quality-oriented adaptive scheme for efficient multimedia delivery. Simulation-based tests indicate that the performance of CASHeW not only outperforms transport layer adaptive delivery protocols like the TCP-Friendly Rate Control Protocol (TFRCP) and Loss Delay Adaptation (LDA+), but also is better than that of medium access control (MAC) layer protocols such as the Receiver Based Auto Rate (RBAR) and Enhanced Distributed Channel Access (EDCA) in terms of average perceived quality, average bit rate and loss rate.Publication Metadata only Optimum number of gateways for cluster-based two-hop cellular networks(Elsevier, 01-04-2010) Venkataraman, Hrishikesh; Nainwal, Shashank; Shrivastava, Pratik; Venkataraman, Hrishikesh; DA-IICT, Gandhinagar; Nainwal, Shashank (200401166); Shrivastava, Pratik (200401188)An ever increasing number of mobile users combined with an increase in the demand for data rates has led researchers to explore the feasibility of multihop cellular networks. However, due to the NP-hard complexity in resource allocation and scheduling techniques in a multihop cellular network, the focus of multihop cellular design is mostly restricted to two-hop. In this work, we analyze the capacity of a cluster-based hierarchical two-hop multi-cellular network, with a frequency reuse of�one. We prove mathematically that when there are�six�cells surrounding the center cell, and the number of simultaneous communicating pairs in all the�six�cells are same, there are six distinct locations in any cell where the link capacity reaches its maximum and six distinct locations where the link capacity reaches its minimum. Significantly, all these twelve points are equidistant. Similarly, we observe that if a cell is surrounded by four cells such that all the base stations (BSs) of the adjacent cells are equidistant from the BS of the center cell, then the number of locations where the capacity is maximum or minimum is found to be exactly�four�each. This provides an insight on the exact number and the location where the gateways should be placed in a hierarchical cellular architecture in order to maximize the system capacity in a multi-cellular environment.Publication Metadata only Spatial reuse efficiency calculation for multihop network(Elsevier, 01-12-2010) Venkataraman, Hrishikesh; Venkataraman, Hrishikesh; Munteana, Gabriel-Miro; Haas, Harald; DA-IICT, GandhinagarA multihop network provides an increase in the spatial and frequency resource reuse as compared to a single-hop network. However, a precise quantification of the benefit obtained in terms of spatial reuse is still an open issue. In this paper, a mathematical analysis is carried out in order to derive the spatial reuse efficiency of a multihop wireless network. It is demonstrated through both approximate and exact analysis, that for an unbounded network, the reuse efficiency of the wireless system increases with the number of multiple hops, M, and the spatial protection margin, Delta, defined around the receiver. Significantly, it has been found that even in case of an infinitely large spatial protection margin, the obtained reuse efficiency is a finite value and is limited by the number of multiple hops in the communicating link. (C) 2010 Elsevier GmbH. All rights reserved.Publication Metadata only Prioritized multimedia adaptation scheme over two-hop heterogeneous wireless networks (PRiMA)(Engineering, 13-05-2010) Maheshwari, Ankit; Agrawal, Shurti; Venkataraman, Hrishikesh; Muntean, Gabriel-Miro; Venkataraman, Hrishikesh; DA-IICT, Gandhinagar; Maheshwari, Ankit (200601204); Agrawal, Shruti (200601232)Live multimedia streaming is one of the greatest promises of a wireless network operator. In recent years, there has been an upsurge of interest in the feedback-oriented multimedia streaming in the wireless domain, in both industry and academia. However, the lack of an acceptable and guaranteed quality of service (QoS) in the wireless domain results in the media packets experiencing dynamic variations in bandwidth, delays and loss rate as they traverse from the sender to the receiver. Moreover, the plethora of wireless devices in the market ranging from i-phone and PDA to laptop, HDTV etc. makes it difficult to provide optimum video quality of the same multimedia content to all the devices simultaneously. In this work, a WiMAX-based two-hop cellular network is considered for multimedia transmission across different hand-held wireless devices. A feedbackbased prioritized multimedia adaptive scheme (PRiMA) is proposed for two-hop heterogeneous wireless networks, which ensures that different clients receive the same video with different perceived quality (satisfactory, good and excellent); depending on: (a) the action content in the video, (b) the end-user�s choice of service, and importantly, (c) the user�s device characteristics. The base station (as the web server) communicates with the end-users through the relay nodes which act as proxy servers. It has been observed that such a prioritization not only results in a higher average perceived quality of the network but also provides a higher perceived quality to majority of the end-users, as compared to the case when there is no prioritization.Publication Metadata only Optimal positions of relay stations for cluster-based two-hop cellular network(Scirp, 01-07-2009) Venkataraman, Hrishikesh; Jaini, Pradeep Kumar; Revanth, Segu; Venkataraman, Hrishikesh; DA-IICT, Gandhinagar; Jaini, Pradeep Kumar (200401087); Revanth, Segu (200401032)Multihop cellular networks is an exciting and a fledgling area of wireless communication which offers huge potential in terms of coverage enhancement, data-rates, power reduction, and various other quality of service improvements. However, resource allocation in MCN is an NP-hard problem. Hence, significant research needs to be done in this field in order to efficiently design the radio network. In this paper, optimal position of relay stations in a hierarchical cluster-based two-hop cellular network is investigated. Vector algebra has been used to derive general equation for carrier-to-interference ratio (C/I) of a mobile station. It has been observed that when the transmit power of base station (BS) and the gateway (GTW)/relay station (RS) are same, the RSs should be located close to mid-point of BS and the edge of the cell. However, significantly, when the transmit power of the BS is greater than that of the GTW, then the RSs should be placed closer to the edge of the cell, in order to maximize the minimum C/I at any point in the cell. This in turn results in higher modulation technique at the physical layer, and hence, a higher data-rate to all the users in the system.Publication Metadata only Dynamic time slot partitioning for multimedia transmission in two-hop cellular networks(IEEE) Venkataraman, Hrishikesh; Muntean, Gabriel-Miro; Venkataraman, Hrishikesh; DA-IICT, GandhinagarIn recent years, there has been an exponential increase in the number of mobile phone users. In addition, a significant growth in the demand for high-rate multimedia services over wireless networks, such as video conferencing, multimedia streaming, etc., was noted. Different solutions were proposed to support high-quality high data rate delivery to mobile users, including resource allocation techniques for packet-radio-based next generation cellular networks. In this paper, an efficient time slot allocation method-Dynamic Time Slot Partitioning (DTSP) algorithm based on statistical multiplexing is proposed for a two-hop cellular architecture. In DTSP, the available bandwidth resources are increased by partitioning each time slot into several minislots wherein different numbers of minislots are allocated to different users. The DTSP algorithm is based on asynchronous time-division multiplexing, wherein users with variable number of packets in their buffers can transmit data sequentially without any loss in the overall available resources. The key advantage of DTSP is that it can flexibly adapt to different quality of service requirements, especially when combined with adaptive modulation. It has been observed that the system capacity achieved by the DTSP algorithm in the downlink mode using adaptive modulation is up to 41 percent higher than when existing solutions are employed. In addition, DTSP results in significantly lower time for data transmission than the state-of-the-art region and time partitioning techniques.Publication Metadata only COARSE: a cluster-based quality-oriented adaptive radio resource allocation scheme(IET, 04-01-2012) Venkataraman, Hrishikesh; Chowdhary, A; Sikora, A; M, Muntean G; Venkataraman, Hrishikesh; DA-IICT, Gandhinagar; Kalyampudi, Poornachand (200501158)There is an increasing demand by an ever-growing number of mobile customers for transfer of rich media content. This requires very high bandwidth which either cannot be provided by the current cellular systems or puts pressure on the wireless networks, affecting customer service quality. This study introduces COARSE � a novel cluster-based quality-oriented adaptive radio resource allocation scheme, which dynamically and adaptively manages the radio resources in a cluster-based two-hop multi-cellular network, having a frequency reuse of one. COARSE is a cross-layer approach across physical layer, link layer and the application layer. COARSE gathers data delivery-related information from both physical and link layers and uses it to adjust bandwidth resources among the video streaming end-users. Extensive analysis and simulations show that COARSE enables a controlled trade-off between the physical layer data rate per user and the number of users communicating using a given resource. Significantly, COARSE provides 25�75% improvement in the computed user-perceived video quality compared with that obtained from an equivalent single-hop network.Publication Metadata only CASHeW: Cluster-based Adaptive Scheme for Multimedia Delivery in Heterogeneous Wireless Networks(Spinger, 01-02-2012) Venkataraman, Hrishikesh; Kalyampudi, Poornachand; Muntean, Gabriel-Miro; DA-IICT, Gandhinagar; Kalyampudi, Poornachand (200501158)Multimedia streaming over heterogeneous wireless networks has attracted significant interest in recent years from both telecom network operators and end users. However, the heterogeneity of the wireless network makes it very difficult to synchronize real-time multimedia streaming to different types of end-user devices across different wireless networks. In addition, with different delay and packet loss across different networks, multimedia delivery over the heterogeneous wireless networks cannot provide good quality streaming video. This paper proposes CASHeW�a novel cluster-based design with an in-built feedback-based adaptive mechanism that results in a higher video perceived quality in two-hop heterogeneous wireless network environments. CASHeW employs a proxy-client-server mechanism between the base station (BS) and the end-user; and importantly uses a quality-oriented adaptive scheme for efficient multimedia delivery. Simulation-based tests indicate that the performance of CASHeW not only outperforms transport layer adaptive delivery protocols like the TCP-Friendly Rate Control Protocol (TFRCP) and Loss Delay Adaptation (LDA+), but also is better than that of medium access control (MAC) layer protocols such as the Receiver Based Auto Rate (RBAR) and Enhanced Distributed Channel Access (EDCA) in terms of average perceived quality, average bit rate and loss rate.