Abstract--Recent advances in wireless sensor technology facilitate the development of remote healthcare systems, which can significantly reduce the healthcare cost. Despite the initial promising results, there remain many obstacles to apply this technology to the practical medical care context. One of the critical issues is to assure the timely and robust delivery of the life-critical medical data in the resource-constrained wireless sensor networking environment. This paper addresses this issue and presents a Quality of Service (QoS) support mechanism for wireless remote healthcare system. The proposed solution integrates (1) XML-based QoS specification, which specifies the QoS requirement of medical data delivery under different patient conditions; (2) patient admission policy, which determines whether the sensor system has enough resource to support the required data delivery quality under all possible scenarios; and (3) differentiated scheduling and queue management, which enables ...