Preventing RLC Buffer Sojourn Delays in 5G

The 3rd Generation Partnership Project (3GPP) is investing a notable effort to mitigate the endogenous stack and protocol delays (e.g., introducing new numerology, through preemptive scheduling or providing uplink granted free transmission) attain heterogeneous Quality of Service (QoS) latency requirements for which fifth generation technology standard broadband cellular networks (5G) envisioned. However, 3GPP’s goals may become futile if exogenous generated by transport layer bufferbloat) Radio Link Control (RLC) sublayer segmentation/reassembly procedure are not targeted. On one hand, bufferbloat specifically occurs at Access Network (RAN) since data path bottleneck located radio link, contemporary RANs deployed with large buffers avoid squandering scarce wireless resources. other Resource Block (RB) that dismisses 5G’s packet-switched network nature, unnecessarily triggers segmentation sender’s RLC sublayer, adds extra delay as receiver’s cannot forward packets higher sublayers until they reassembled. Consequently, exogenously queuing can surpass delays, neutralizing attempt reduce latency. We address RLC’s related buffer present two solutions: (i) we enhance 3GPP propose avoidance algorithm, (ii) RB scheduler circumventing added sojourn time caused packet procedure. Both solutions implemented extensively evaluated along state-of-the-art proposals in testbed verify their suitability effectiveness under realistic conditions use (i.e., considering Modulation Coding Scheme (MCS) variations, slices, different traffic patterns off-the-shelf equipment). results reveal current deficits its QoS model contribution total delay.