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We consider the problem of energy-efficient transmission in multi-flow multihop cooperative wireless networks. Although the performance gains of cooperative approaches are well known, the combinatorial nature of these schemes makes it difficult to design efficient polynomial-time algorithms for joint routing, scheduling and power control. This becomes more so when there is more than one flow in the...
In this paper, we consider the challenging problem of power allocation in interfering wireless networks with services having stringent delay constraints. The objective is to allocate optimally the power to each user, take advantage of the time diversity of the time varying channel and satisfy the delay constraints of the services. To this end, we model the bit rate dynamics of the users as a linear...
With the proliferation of wireless networks for prac- tical deployments in recent years, secure fast handoff has become significantly important to provide secured access while reduce the latency caused by handoff procedure. Channel probing/scanning delay has been a major contribution to the overall latency of handoff in IEEE 802.11 based wireless networks. In this paper, we present a novel secure...
These days the growth of multimedia applications (e.g. VOIP, teleconferencing etc) over Wireless Networks is on its peak and will further increase with the time. The available bandwidth for Wireless Networks fails to meet the requirements which result in high packet loss of multimedia data, delay in transmission and decreases the quality of multimedia applications. So many approaches are proposed...
In this paper, we propose a secure data-forwarding scheme, called SATS, for delay-tolerant wireless networks. SATS uses credits (or micropayment) to stimulate the nodes' cooperation in relaying other nodes' messages and to enforce fairness. SATS also makes use of a trust system to assign a trust value for each node. A node's trust value is high when the node actively forwards others' messages. The...
Call admission control (CAC) functionality is a critical requirement for guarantee the desired quality of service (QoS) for voice calls in IP-based wireless networks. In this paper, three different CAC strategies for voice over IP (VoIP) traffic over wireless access networks with packet buffering are mathematically analyzed through a joint call and packet level discrete time teletraffic model. The...
As a fundamental source of delay in wireless networks, the local delay is defined as the mean time, in number of time slots, until a packet is successfully received (decoded) over a link. This paper shows that with mean power and peak power constraints at each node, power control can significantly reduce the local delay. We show that, for links with Rayleigh fading and random length, there exists...
Ad hoc wireless networks are characterized by frequent node mobility, limited power reserves and interfering transmissions. On-demand routing proves to be more successful in such networks, as it reduces the traffic overhead of sending periodic updates, but they may be susceptible to both random uncertainty in radio links, and malicious jamming. We consider a network of nodes addressed by their locations,...
The present wireless networks aim to make anywhere and anytime communication possible. The operations which allow networks to achieve this goal have drawn tremendous attention over the recent past. Location management (LM) is one such operation that aims to determine the exact location of mobile devices. LM facilitates the searching or paging process that is performed during the downlink channel acquisition...
To improve driving comfort and provide entertainment services, vehicular communication networks (VCNs) have appeared as an emerging solution, which consists of road-side units (RSUs) and on-board units (OBUs) to distribute multimedia contents. However, as most of OBUs always request the stored contents in the RSUs, how to update the contents in these RSUs when the original changes at its original...
We study the multicast throughput capacity for hybrid wireless mobile ad hoc networks (MANETs) with a directional antenna and delay constraint. The hybrid wireless network consists of a mobile ad hoc network with nodes and regularly placed base stations connected by high-bandwidth wired links. For the MANET, there are multicast sessions and each multicast session has one source which transmits...
Rate adaptation is extremely crucial to the system performance of wireless networks. Existing rate adaptation schemes mainly make use of channel information (e.g., packet error rate or signal strengths of received packets) to adapt transmission rates. In this paper, we find out that it is beneficial for rate adaptation schemes to consider priorities of packets when adapting transmission rates. We...
In this paper, we study the delay/throughput trade-off with opportunistic relaying over channels with random connections, in which the channel connections are independent and identically distributed (i.i.d.). Previous work~\cite{CA:07} which proposed an opportunistic relaying scheme has focused on the throughput analysis only, we show that the opportunistic relaying scheme provides an upper bound...
The IMS (IP Multimedia Subsystem) can provide multimedia services between heterogeneous wireless networks. But the efficiency of the service session handoff will bring a significant impact to user experience. For the integration of heterogeneous wireless networks, we propose a SIP-based multimedia service session handoff method named MS2HM. To reduce the handoff delay between heterogeneous wireless...
In order to fulfill the users' insatiable interests in accessing the Internet services and information wirelessly, one of key optimization techniques is caching frequently accessed the data items in a local cache. However, a strong consistency is implicitly assumed in most caching schemes but it may frequently occur a long query delay. In this paper, we propose a consistency-sensitive data access...
This paper identifies regimes of high connectivity and the associated throughput, delay, and energy per bit scaling performance of a power-limited infrastructureless wireless network. Infrastructureless wireless networks are a key strategic technology for future military communications. In their current state, their utility for mission critical applications is limited by their susceptibility to disconnection...
In the past decade, we have witnessed accelerated and multi-faceted developments in hyper-connected world, providing wired/wireless licensed or unlicensed-based access networks such as DSL, cable, or WiFi™, cellular and WiMAX networks. Today, since we have virtually unlimited digital data in the network accessible from everywhere, a divers set of contents and aggressive traffic have accentuated the...
In this paper, we discuss a fairness energy algorithm for the M2M renewable network. The algorithm mainly contains the flow control and transmission strategy and has low computational complexity. The aim is to reach an asymptotically optimal average network performance while keeping the fairness among nodes.
Deployment of femtocells with open or hybrid access into mobile networks leads to problems with handling handover of mobile users. In this paper we discuss two important aspects that can be considered and exploited in a design of innovative handover procedure for scenario with femtocells. The first aspect is related to varying quality and limited capacity of femtocell's backbone. Further, an accuracy...
In this paper, we focus on designing efficient query of top-k data produced by sensor nodes in a wireless sensor network (WSN). Assume that we are given a connected WSN of diameter D, consisting of n nodes with maximum node degree Δ. Two different models are studied. In the first model, each node holds a numeric element, the goal is to determine the top-k smallest (or biggest) of these elements from...
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