A decentralized secure protocol for casting trust rating in reputation systems (StR protocol) is lately proposed by Dimitriou and Michalas, and the StR protocol is verified to be faster than the previous work providing anonymous feedback. In this letter, we present new enhanced scheme of StR. Compared with StR protocol, our new approach attains the exactly same security, but requires less proce...

Cooperation and coordination in a multi-robot team is a very important feature of autonomous systems, but require communication between wireless components (i.e., robots) to re-construct a global model of the system. Generally, communication protocols for such networks are not self-stabilizing. In this work, we study the protocol proposed in [1]. This protocol has two specific features : networ...

Reliability of the message passing in multicast communications depends on ordering of messages in conformance with properties of used communication protocol. Among others, CBCAST is the protocol used for ordering and synchronization of messages in multicast communication. This study aims to discuss verification of message passing in the multicast communication against properties of the CBCAST p...

With the development of computer network, the smart of communication agents was significantly increased, more intelligent process can be done by computers. To realize this, agents need more detailed concrete message to be transferred. But what should be transferred? How to transfer necessary message to improve the receiver’s understanding capability and not add too much communication load? In t...

This paper proposes a biological cell-based communication protocol to enable communication between biological based nano devices. Inspired by existing communication network protocols, our solution combines two molecular computing techniques (DNA and enzyme computing), to design a condensed three layer protocol stack for Molecular Communication Networks. Based on computational requirements of ea...

The improvement of the communication systems is conducted through communication protocol engineering and optimization process. This paper presents an effort to upgrade the IEEE 802.16 and IEEE 802.16e protocol performance regarding the delay during subscriber network entry or base station handover. Our communication protocol engineering process of WiMax protocol and its optimization resulted in...

We present a new implementation of TDMA communication protocol for wireless sensor networks. The ITEM (Integrated TDMA E-ASAP Module) is a TinyOS 1.x module primarily determined for TelosB platform. It provides a TDMA (Time Division Multiple Access) communication protocol integrated with slot assignment protocol E-ASAP (Extended Adaptive Slot Assignment Protocol). The ITEM module deals with a c...

In this paper, we investigate a new efficient QoS routing protocol based on the time-slot leasing mechanism over Bluetooth WPANs. The ''transmission holding'' problem is incurred because the master node is the communication bottleneck for each slave-master-slave communication in Bluetooth. To alleviate this problem, a time-slot leasing scheme is adaptively incorporated into our scheme to provid...

Secure group communication (SGC) has been an active research area because several applications require it. In this paper, we propose a Block-Free Group Tree-based Diffie-Hellman (BF-TGDH) key agreement protocol, based on a recently proposed Group Treebased Diffie-Hellman (TGDH) key agreement protocol, for secure group communication. The new protocol has the following specific properties: (1) no...

Group communications are becoming increasing important in the development of distributed applications and services. Group communication protocols in both distributed multimedia applications and distributed operating systems offer the programmer a rich paradigm for the easy construction of distributed application. The group communication protocol implementation must provide the basic mechanisms ...