tailieunhanh - Báo cáo hóa học: " Enabling location-aware quality-controlled access in wireless networks"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Enabling location-aware quality-controlled access in wireless networks | Kim et al. EURASIP Journal on Wireless Communications and Networking 2011 2011 102 http content 2011 1 102 o EURASIP Journal on Wireless Communications and Networking a SpringerOpen Journal RESEARCH Open Access Enabling location-aware quality-controlled access in wireless networks Hwangnam Kim 1 Hyun Soon Kim1 Suk Kyu Lee1 Eun-Chan Park2 and Kyung-Joon Park3 Abstract Location-based services LBSs such as location-specific contents-providing services presence services and E-911 locating services have recently been drawing much attention in wireless network community. Since LBSs rely on the location information in providing services and enhancing their service quality we need to devise a framework of directly using the location information to provide a different level of service differentiation and or fairness for them. In this paper we investigate how to use location information for QoS provisioning in IEEE Hot Spot networks. Location-based service differentiation is different from existing QoS schemes in that it assigns different priority levels to different locations rather than flows or stations and schedules network resources to support the prioritized service levels. In order to realize such the location-based service differentiation we introduce the concept of per-location target load to simply represent the desirable rate of traffic imposed to the network which is dynamically changing due to the number of stations. The load consists of per-location load which directly quantifies per-location usage of link capacity and network-wide load which indirectly calibrates the portion of per-location load contributed to the network-wide traffic. We then propose a feedback framework of provisioning service differentiation and or fairness according to per-location target load. In the proposed framework the load information is feedback to traffic senders and used to adjust their sending rate so that per-location load does not deviate .