Uplink scheduling in LTE
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Presentation Transcript
Uplink scheduling in LTE Presented by Eng. Hany El-Ghaish Under supervision of Prof. AmanySarhan Dr. Nada Elshnawy
Introduction to LTE • The performance targets promised by LTE makes it an ideal solution to accommodate the ever increasing demand for wireless broadband. • LTE's performance targets because • a simplified system access architecture and • a fully IP-based platform. • LTE has also great enhancements in its technologies : • Orthogonal Frequency Division Multiplexing (OFDM) • advanced antenna technologies MIMO • LTE capabilities • enhanced Quality of Service (QoS) support for multiple data services, such as voice and other multimedia applications.
LTE Performance Targets • The requirements and goals that are set for LTE • Peak Data rate • Reduced Latency • Bandwidth Flexibility • Support for Heterogeneous Network Deployment. • Simplified Architecture • Enhanced QoS Support
LTE Packet Scheduling • LTE packet scheduling (PS) • Part of LTE's Radio Resource Management (RRM) . • PS resides in eNodeB(base station). • Enhance the system's data rate . • Support the diverse QoS requirements of mobile services. • PS allocate radio resources to mobile User Equipments (UEs) for both uplink and downlink. • PS must consider uplink channel conditions and QoS requirements in the presence of single and multiple traffic scenarios
Packet scheduler • Intelligent distribution of radio resources among active UEs optimizes the system performance and also reduces the cost per bit transmitted over the radio interface. • The intelligence of eNodeB PS depends on several factors: • The types of traffic flows running over the LTE interface and their respective QoS requirements. • Channel quality per UE to properly adapt the transmission rates on both the uplink and downlink directions( Enhancement due to OFDMA in tie and frequency).
Uplink packet Scheduler • Uplink PS needs extra factors: • UE power limitation • contiguity constraint of resource allocation to avoid segmentation of radio resource allocation to a single UE.
Contribution • The performance study focuses on dynamic uplink schedulers that is centralized at the the LTE eNodeB. • survey on literature works for LTE uplink scheduling • Selected the evaluation metrics • Developed a system-level simulator in MATLAB
The LTE uplink simulator • LTE standard: • the physical layer frame structure, • system access node structure, traffic models, • standardized QoS provisioning
