Survey on Priority Based Schemes Used For Data Dissemination in Wireless Body Area Network
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Abstract
Signals generated by human body can be divided into two classes based on their significance to the life: critical signals or emergency signals and non-critical signals or normal signals. The critical real-time messages (RTMS) or vital signs should be transmitted within the time limit and they must be collision free. On the other hand, the noncritical signs or non-real-time messages (NRTMS) are required to be delivered with the best effort. In wireless body area networks (WBAN’s) sensing various types of data needs accuracy as it is critical to human life, in order to achieve exact diagnoses data should be transmitted in reliable and real-time manner. To save precious life various protocols are designed in which data having high priority is transmitted first. In some protocols priority is assigned to nodes. Assigning priority includes number of parameters for example type of data i.e. Emergency or normal and backoff period .In this paper protocols that provide reliable and collision free transmission by allocating channel on the priority basis are discussed. Outcome of some of the papers has been reviewed in this paper as large numbers of journals and research papers have been published regarding priority based access techniques used in wireless networks.
Keywords—priority, WBAN, backoff period, reliable, collision.
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