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code capsule
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  code capsule
We also assume that the requested code capsule consists of p chunks.
      
In each experiment, we updated a code capsule of group 2, which consisted of 2 chunks.
      
Each piece of code for a context is called a code capsule.
      
By analyzing the simulation traces, we found that this was because each forwarder could serve requests for exactly one code capsule.
      


>=Loading program code to sensor nodes is one of the most basic functions of sensor network. Traditionally, program code is developed in a more powerful host machine and then loaded through directly connected parallel or serial cable one sensor node at a time. After programmed, sensor nodes are usually deployed to different locations of application environment and become hard to gather. If bugs are found or new functions are added to program, new program code needs to be loaded to every sensor nodes. In respect...

>=Loading program code to sensor nodes is one of the most basic functions of sensor network. Traditionally, program code is developed in a more powerful host machine and then loaded through directly connected parallel or serial cable one sensor node at a time. After programmed, sensor nodes are usually deployed to different locations of application environment and become hard to gather. If bugs are found or new functions are added to program, new program code needs to be loaded to every sensor nodes. In respect that nodes are deployed in different locations and are hard to gather, In-Network-Programming is greatly needed. In this paper, a novel resident In-Network-Programming mechanism is presented. Familiar with other network programming methods, our mechanism reprograms sensor nodes in two steps: At the beginning, the host machine broadcasts program code and the sensor nodes store the received code in the external storage; and then, boot loader copies the binary code to program memory. However, two key improvements are involved in this resident mechanism. First, instead of transmitting both the user application and the unchanging In-Network-Programming module, resident mechanism only needs to disseminate the binary code of the new user application by radio, while the In-Network-Programming application is resident in all the sensor nodes. Second, bitmap indexing, which uses one bit to represent one code capsule, is applied to record serial number of packets which are lost during transmission. Accordingly, both radio transmission and external storage operation are dramatically reduced. This makes the mechanism to be energy-efficient and timesaving. Moreover, because the In-Network-Programming application and the user application occupy the program memory in different stage, nearly one quarter of program memory in each sensor node is saved to accommodate larger user application. Our resident mechanism is a versatile amendment and can be easily incorporated with many other network programming approaches.

无线传感器网络部署完成后,因为程序版本升级等原因会需要给网络中的节点重新下载程序。但是部署在不同位置的节点很难再被集中起来,于是需要一种通过网络下载程序的方法,即在网络编程方法。本文提出了一种驻留式在网络编程机制。该机制减小了需要传送和存储的二进制程序代码的大小,并使用位图索引记录网络下载中丢失的程序块。因此,网络下载和存储器存取都大大减少,使得该机制既节约能量又省时。

 
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