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The following topics are dealt with: environmental electromagnetic compatibility; RFID technology; Internet; mobile wireless network; quality of service; wired network; ad hoc network; sensor network; mobile communication; wireless communication; communication theory; communication software; information infrastructure; information security; communication protocol; signal processing; signal coding;...
Internet architecture is facing at least three major challenges. First, it is running out of IPv4 addresses. IPv6 offers a long-term solution to the problem by offering a vast amount of addresses but is neither supported widely by networking software nor has been deployed widely in different networks. Second, end-to-end connectivity is broken by the introduction of NATs, originally invented to circumvent...
In this paper, we propose a trajectory-aware vertical handoff algorithm based on position, velocity, signaling delay and receive signal strength (RSS) of MT. In order to provide seamless service in modern heterogeneous networks, handoff of the MT should be initiated with correct timing. In our algorithm, velocity of MT is divided into two parts as radial velocity and tangential velocity. For more...
In this paper we report design examples of multiple serially concatenated multiple parity-check (M-SC-MPC) codes, we have recently proposed, that can be suitable for application in high speed wireless networks. We consider some low-density parity-check (LDPC) codes included in the mobile WiMax standard, and compare their performance with that of M-SC-MPC codes having the same parameters. Our results...
Traditional Orthogonal Variable Spreading Factor (OVSF) code assignment designs aim to reduce code blocking irrespective to the complexity and cost involved. We propose an OVSF code assignment scheme which reduces the complexity involved as compared to crowded first assignment scheme (which is one of the most popular single code assignment schemes). This is because the proposed scheme needs to check...
In self-configured ad hoc networks, which is composed of information sources and user mobile devices (like BIONETS) the data dissemination is based on two kinds of communication: communication among mobile devices and between information sources and mobile devices. The communication among mobile devices can be solved by some existing algorithms and methods based on the broadcast medium. In the case...
Although barcode was invented about sixty years ago, barcode technology became applicable for value-added services in telecommunication industry just few years back. Nevertheless, some issues regarding reliability, security and performance still exist, and therefore mobile ticket lifecycle has to be analysed carefully in order to be adopted and implemented into a given system. This paper presents...
Location-based services are services that provide some information related to the specific location. Location is usually defined as basic, geographical location. However, this kind of information can be upgraded with additional knowledge about user context, such as knowledge about movement habits. The upgrade of basic location information with other contextual information is the key for enabling advanced...
In a nearby future wireless networks will run applications with special QoS requirements. FHMIP is an effective scheme to reduce Mobile IPv6 handover disruption but it does not deal with any other specific QoS requirement. Therefore new traffic management schemes are needed in order to provide QoS guarantees to real-time applications and this implies network mobility optimizations and congestion control...
Vehicular delay-tolerant networks (VDTNs) are a promising technology for vehicular communications, creating application scenarios that enable non-real time services with diverse performance requirements. Because of scarce network resources (e.g. bandwidth and storage capacity) and node's short contact durations, the underlying VDTN network infrastructure must be capable of prioritizing traffic. This...
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