Dual Congestion Control for DualConnectivity Sumrate Optimization of

Outline • Motivation • Google BBR • Proportion-based schemes • DCCDC • Conclusion 2

Motivation • Dual-connectivity in LTE/NR – Dense Deployment & Frequent handover – Sum-rate maximizing

Google BBR • TCP/UDP Communication • TCP congestion control – Packet loss based 4

Google BBR • Packet loss based TCP congestion control – Slow start – Congestion

Google BBR • Packet loss based TCP congestion control – Types of packet loss

Google BBR • BBR – BDP = (max BW)*(min RTT) 7

Google BBR • BBR – 20 s (10 Mbps 20 Mbps) – 40 s

Proportion-based schemes • Problem description – TCP connection – PDCP dispatcher – Multi-RLCs –

Proportion-based schemes • The basic idea – UE disorder – Buffer status – Proportion

DCCDC • Dual Congestion Control for Dual-Connectivity – PDCP dispatcher provides congestion control for

DCCDC • Assignment mark – Assign packets to SBS – Retransmission for MBS and

DCCDC • PDCP dispatcher congestion control – CWND-like queue • Startup • Retransmission and

Conclusion • A DCCDC scheme is proposed to design a packet dispatcher for SBS,

Others • DC & CA report • Globecom 2019 17

Others • Globecom 2019 Keynote (architecture design) – Connection migration • QUIC – IP

Others The vast Pacific Ocean has ample space for China and the United States.

Slides: 20

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Dual Congestion Control for Dual-Connectivity: Sum-rate Optimization of TCP Connection Reporter: Zhichao Zou 上海大学 Shanghai University

Outline • Motivation • Google BBR • Proportion-based schemes • DCCDC • Conclusion 2

Motivation • Dual-connectivity in LTE/NR – Dense Deployment & Frequent handover – Sum-rate maximizing in TCP services – Future multi-RATs 3

Google BBR • TCP/UDP Communication • TCP congestion control – Packet loss based 4

Google BBR • Packet loss based TCP congestion control – Slow start – Congestion avoidance – Fast retransmit – Fast recovery 5

Google BBR • Packet loss based TCP congestion control – Types of packet loss – Buffer expansion 6

Google BBR • BBR – BDP = (max BW)*(min RTT) 7

Google BBR • BBR 8

Google BBR • BBR – 20 s (10 Mbps 20 Mbps) – 40 s (20 Mbps 10 Mbps) 9

Google BBR • BBR – BBR vs Qubic 10

Proportion-based schemes • Problem description – TCP connection – PDCP dispatcher – Multi-RLCs – Key issues • Wireless channel • Packet arrival in disorder 11

Proportion-based schemes • The basic idea – UE disorder – Buffer status – Proportion matching 12

DCCDC • Dual Congestion Control for Dual-Connectivity – PDCP dispatcher provides congestion control for SBS 13

DCCDC • Assignment mark – Assign packets to SBS – Retransmission for MBS and SBS • Dual congestion control – TCP congestion control (MBS) – PDCP dispatcher (SBS) 14

DCCDC • PDCP dispatcher congestion control – CWND-like queue • Startup • Retransmission and reassignment – Rate exploration • BW & RTT probe – Input of PDCP dispatcher • ACK • RTT 15

Conclusion • A DCCDC scheme is proposed to design a packet dispatcher for SBS, which realize congestion control for extra link • TODO – OAI-based platform – Experiment results 16

Others • DC & CA report • Globecom 2019 17

Others • Globecom 2019 Keynote (architecture design) – Connection migration • QUIC – IP networks • IPv 4 IPv 6 – Security • DNS over TLS, DNS over HTTPS • Asymmetric encryption 18

Others The vast Pacific Ocean has ample space for China and the United States. 19

Thanks 20

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