LTE system performance optimization by RED based PDCP buffer management

Abstract:
Long Term Evolution (LTE) provides a new radio technology that allows operators to achieve even higher peak throughputs than HSPA+. One of the LTE system performance optimization point is the PDCP buffer management. PDCP buffers at eNB hold user data before it is scheduled by the eNB MAC scheduler for transmission over the radio interface. This buffered data also contributes towards X2 traffic volume and required a certain inter-eNB handover completion time depending upon amount of data buffered in bearer buffers. A suitable buffer management scheme is required to keep PDCP buffer occupancy to a minimal level without a noticeable degradation in user application performance. This work suggests RED as buffer management scheme for PDCP bearer buffers at eNB and provides a thorough study of its performance for several real world scenarios. Through an intensive set of simulations effectiveness of proposed PDCP buffer management scheme in achieving an optimal PDCP buffer occupancy is proved. Furthermore configuration parameters are suggested to achieve optimum LTE system performance using the proposed scheme. Index Terms — LTE, PDCP buffer management, LTE handover performance optimization, RED buffer management scheme, User QoE optimization