Communications protocol

About: Communications protocol is a research topic. Over the lifetime, 19148 publications have been published within this topic receiving 349625 citations.

Zigbee Cluster Tree Performance Improvement Technique

Abstract: Zigee is the communication protocol designed for wireless networks. It has low rates, low complexity, cost and power consumption also for connectivity with portable. Due to increasing demand for mobile services and in the same way mobile devices consume the network services of the service provider.Every network have their own pros and cons with lot of scope for enhancement of network. Zigbee network offers higher performance over different parameters seen the promising structure of network, So to achieve better performance many researchers proposed zigbee cluster tree network. Still there is scope for modification to enhance the zigbee network. To complete this demand and to achieve high performance network Zigbee cluster-tree network, we propose method to investigate their promises and their performance over different performance parameters, and also proposed the required changes.To justify modification for the model, implementation ofmodifications made in the network is performed and comparing performance of theproposed technique with existing Zigbee cluster network tree. Inproposed method work Enhance the algorithm for Zigbee Cluster tree network which is compatible with IEEE802.15.4 standard.

Proposed specification of BX.25 link layer protocol

Abstract: The BX.25 link-layer protocol is a standardized procedure for establishing and maintaining a connection across a data link. Virtually all such standardized communication protocols worldwide are defined through English-language specifications. While the English-language BX.25 specification was developed with exceptional care and in fact represents an improvement over the international standard X.25, it is argued here that it, or any English-language specification, can be expected to fall short of the implicit objective: to define implementations that will be mutually compatible and satisfy given performance criteria. An alternative formal specification is presented. Among its attributes are that it is by its nature mathematically precise; it provides a medium for formal structured development and formal proof of performance of a task (validation) independent of any implementations; and the formal specification may be implemented into software or hardware in an automated fashion, reducing the need for laborious and repetitive implementations and virtually eliminating the need for “certification” of implementations. The specification given here can also be used to resolve issues of vagueness, ambiguity, and contradiction as they arise in the English-language BX.25 specification standard.

Software system and method for controlling processor system

Abstract: PURPOSE: To simplify the development and change of a software system, and to reduce costs by providing a linker structure enabling communication by using a mark name for identifying a program structure. CONSTITUTION: This system is provided with a linking mechanism in which a software constituting element can communicate by using a mark name related with the physical characteristics of the system instead of an address. An inter- program mutual communication protocol uses an expression to be executed only by using the mark name, and the communication software constituting element can be independently developed. It is not necessary for a certain program entity to know the address of the other program entity, and synchronous communication can be attained by the inter-program mutual communication by the expression to be executed, and a transmission side can start without ant necessity of waiting.

A wireless multimedia LAN testbed

Abstract: In order to support research into wireless multimedia networking at DalTech, Dalhousie University, we have established a wireless local area network (LAN) of personal computers (PCs) with WaveLAN radio cards. This network serves as a platform to investigate real-time applications. Applications run over the modified TCP/UDP/IP protocol stacks to accommodate the dynamic multimedia traffic and unpredictable radio channel conditions. The research supported with this infrastructure concentrates on networking algorithms for rapidly deployable radio networks and performance evaluation techniques. In particular, we are involved in software development to allow experimental verification of the proposed protocols using subjective criteria, such as throughput as seen by the user and effective transmission range. In our network protocols, adaptive control algorithms are implemented to account for the varying network conditions. We present a set of measurements for a 2.4 GHz WaveLAN and analyze its behavior. We examine issues such as (i) packet loss; (ii) throughput; (iii) signal and noise levels; and (iv) jitter.