In this work the performance of the radio link control (RLC) level of the Universal Mobile Telecommunications System (UMTS) is investigated. The role of a correct setting of link layer parameters is evaluated by considering both forward and backward channel metrics. End-to-end performance is obtained considering the TCP flow. The main findings of our investigation are that: i) a correct setting of RLC parameters is pivotal to avoid deadlock events, that would lead to a dramatic performance degradation; ii) schemes using receiver-driven retransmission requests give the best performance; iii) the EPC mechanism gives very good performance in terms of delay, throughput and energy; iv) anomalous behaviors, leading to delay jitter performance degradation, are observed for some receiver-driven schemes. Again, EPC is able to overcome these problems.
On the UMTS RLC Parameters Setting and their Impact on Higher Layers Performance
ROSSI, MICHELE;ZORZI, MICHELE
2003
Abstract
In this work the performance of the radio link control (RLC) level of the Universal Mobile Telecommunications System (UMTS) is investigated. The role of a correct setting of link layer parameters is evaluated by considering both forward and backward channel metrics. End-to-end performance is obtained considering the TCP flow. The main findings of our investigation are that: i) a correct setting of RLC parameters is pivotal to avoid deadlock events, that would lead to a dramatic performance degradation; ii) schemes using receiver-driven retransmission requests give the best performance; iii) the EPC mechanism gives very good performance in terms of delay, throughput and energy; iv) anomalous behaviors, leading to delay jitter performance degradation, are observed for some receiver-driven schemes. Again, EPC is able to overcome these problems.Pubblicazioni consigliate
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