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LTE TCP Throughput vs Round Trip Time (RTT)

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•The Transmission Control Protocol (TCP) is designed to provide reliable transport for packet 

data.

•Today TCP is used for 80-90% of all packet traffic in the internet.

•TCP is typically used in applications where reliability is important and some delay can be 

tolerated (web browsing, Email, FTP).

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X2 Latency Aspects

•U-plane

–X2 latency should be less or equal than radio link interruption time during HO 

(30…50ms) for optimum performance

–X2 latency significantly less than radio link interruption time would have no benefit

•C-plane

–3GPP 36.423 defines X2 C-planes timers, giving implicitly an upper bound for the 

 X2 transport RTT (50ms default, configurable 10…2000ms)

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