Dr. Nespot agent, proxy

his own place. This can happen when either the closer AP or the ,terminal itself does not work properly. Note that all the NESPOT ,APs' use the same Service Set ID (SSID) "NESPOT." The ,channel quality could be severely degraded due to interferences ,from other neighboring APs. Moreover, each individual ,customer's perception about the WLAN performance can be ,different. Someone may even complain about her/his WLAN, ,which operates normally. The operator needs to measure how the ,WLAN performs quantitatively to decide a proper remedy. If the ,performance of the air-link is considerably poor, the service ,provider should install a new AP additionally or replacing the old ,one or change the allocated channels of other neighboring APs. ,That is, the process to measure the performance over the air link ,can be an initial step for satisfying the customer and provisioning ,the network.  ,The architecture for building this function is based on a 3-way ,handshake among Dr. Nespot manager, Dr. Nespot agent, and ,client station. The manager at the remote node or near associated ,station sends an initial PDU, which requests the performance ,measurement, to an AP. Then,  the AP begins measuring the ,performance metrics, e.g., throughput, delay, and jitter by ,repeating dummy packet transmissions to a specific client station ,during a specific time interval. The results of measurement are ,calculated by client and sent to Dr. Nespot manager through the ,agent. ,4. QOS PROVISIONING EFFORTS ,Currently, KT provides VoIP services for both wireline and ,wireless (based on NESPOT) Internet users. The voice traffic ,requires low end-to-end latency in order to maintain the ,interactive communication. Video on Demand (VoD) is also one ,of the future target services of KT. Video traffic also requires a ,bounded latency even though the requirement is a bit relaxed ,compared to the voice traffic.  It is well-known that the current ,Internet provides the best-effort service in the sense that it does ,not provide any QoS (e.g., latency and throughput) required for ,different types of traffic and applications. It goes the same with ,the NESPOT service since the current WLAN does not provide ,any QoS. In order to improve the service for the real-time traffic ,such as voice and video, an enhancement of the existing WLAN is ,needed.,