One of the main parameters while accessing a wireless mobile adhoc network is the Quality-of-Service (QoS) routing protocol. Providing QOS is of utmost importance in wired line and wireless ad-hoc networks that abide number of mobile nodes mutually interdependent on multi-hop wireless paths due to multi hop communications, node mobility, channel access conflicts and inadequate central coordination. The main application of QoS is guaranteed in multimedia and error sensitivity. An entirely distributed adaptive algorithm that can provide statistical QoS on the subject of service accessibility in an adhoc network is proposed in this study. Optimization of a new QoS parameter to afford adequate service, keeping the overheads minimal is proposed in this algorithm. So, the lower and upper bounds of service efficiency is theoretically derived based on the unique model and the results depict that our algorithm is competent in achieving better QoS under group mobility.