Abstract—IEEE 802.15.4 aims low data rate communication with limited power devices and cheap wireless networking solutions. IEEE 802.15.4 can be used in a variety of applications include: Wireless Sensor Networks (WSN) and Wireless Body Area Sensor Networks (WBAN). IEEE 802.15.4 can be adapted for WBAN due its low duty cycle process to preserve node’s energy. The duty cycle operation in IEEE 802.15.4 is mainly based on two MAC parameters: beacon order (BO) and super frame order (SO). Currently, IEEE 802.15.4 recommends use of fixed values of both BO and SO. Therefore, selection of optimal values of both BO and SO is crucial for efficient communication. These values have high impact on energy consumption, throughput and latency. In this paper, a load adaptive MAC (LA-MAC) protocol is proposed to dynamically select both BO and SO values aiming to enhance the throughput and network life time and minimize latency. The results show that load adaptive MAC protocol outperforms IEEE 802.15.4 in terms of throughput, energy consumption and latency when compared. Index Terms—IEEE 802.15.4, Dynamic duty cycling, Body area sensor networks, SO, BO, LA-MAC. I. INTRODUCTION The IEEE 802.15.4 [1] is intended for low data rate wireless personal network (LR-WPAN). WPAN are anticipated for a variety of wireless sensor applications ranging from the environmental surveillance, health monitoring and the home automation to networking in or around a human body. WBAN is a form of WPANs has dynamic importance in health monitoring. WBAN is a wireless network which interconnects in and on body sensors and form a self-configurable network. These sensors are used to collect information that can be used by care givers to observe the health of patient. There are many numbers of tiny nodes together to form wireless sensor network which has low cost as well as low power consumption properties. To form a cluster network there is one master node need which is connected to several slave nodes all nodes are connected to this master nodes and master node is connected to some PDA or Pcs. Data from client nodes comes to master node and then from master to PDA or PCS. The clustering concept is used for improving the lifetime of network and to reduce power consumption. Many of the work is done foe clustering algorithms that how many nodes should be there in network and vice versa and also how balance these networks. Neither work is done on energy level of the network and their balancing. In this paper, we have pertains a new technique to balance the number of nodes in the clusters based on the energy level of the wireless sensor nodes. This technique is compared with the default ZigBee clustering protocol to measure its performance [2]. A WBAN consists of in-body and on-body sensor nodes that constantly monitors patient for analysis under the Wireless Medical Telemetry Services (WMTS) licensed band. Table 1 shows some of the WBAN applications. ADNAN KHAN 1 , SYED IRFAN ULLAH 2 , ARSHAD FARHAD 3 , A WAJID ULLAH KHAN 4 , ABDUS SALAM 5 , MUAZZAM A. KHAN 6 , M. SIKANDAR HAYAT KHIYAL 7 1,2,4,5 Department of Computing & Technology Abasyn University Peshawar 3 Department of Computer Science Comsats Sahiwal 6 NUST College of EME Rawalpindi, 7 Faculty of Computer Science, Preston University Islamabad Load Adaptive Dynamic Protocol for QoS Provision in Wireless Body Area Sensor Networks International Journal of Computer Science and Information Security (IJCSIS), Vol. 14, No. 5, May 2016 325 https://sites.google.com/site/ijcsis/ ISSN 1947-5500