Multipath TCP in Smartphones Equipped with Millimeter Wave Radios
Multipath TCP in Smartphones Equipped with Millimeter Wave Radios
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DOI：
10.1145/3477086.3480839
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发表时间：
2021-10
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影响因子：
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通讯作者：
Imran Khan;Moinak Ghoshal;Shivang Aggarwal;Dimitrios Koutsonikolas;Joerg Widmer
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作者：
Imran Khan;Moinak Ghoshal;Shivang Aggarwal;Dimitrios Koutsonikolas;Joerg Widmer
众所周知，毫米波链路对人为阻塞和客户端移动性的敏感性最近促使研究人员提出了在双频商用现成设备中同时利用802.11ad无线电(在60 GHz频段运行)和传统802.11ac无线电(在5 GHz频段运行)以同时提供Gbps吞吐量和可靠性的方法。一种这样的方法是通过多路径TCP(MPTCP)，这是一种对应用程序透明的传输层协议，不需要更改底层无线驱动程序。然而，到目前为止，MPTCP(以及其他捆绑方法)仅在使用笔记本电脑客户端的60 GHz无线局域网中进行了评估。在这项工作中，我们首次将MPTCP源代码移植到配备802.11ad和802.11ac无线电的双频智能手机上。我们讨论了我们面临的挑战以及使电话能够支持Gbps数据速率并在理想条件下产生最佳MPTCP吞吐量(即两个无线电的单个吞吐量的总和)所需的系统级优化。我们还首次评估了双频802.11ad/ac智能手机中MPTCP的功耗，并为设计一个节能的MPTCP调度器提供了建议。我们将我们的源代码公之于众，以便其他研究人员能够在配备毫米波无线电的智能手机上试验MPTCP。
The well-known susceptibility of millimeter wave links to human blockage and client mobility has recently motivated researchers to propose approaches that leverage both 802.11ad radios (operating in the 60 GHz band) and legacy 802.11ac radios (operating in the 5 GHz band) in dual-band commercial off-the-shelf devices to simultaneously provide Gbps throughput and reliability. One such approach is via Multipath TCP (MPTCP), a transport layer protocol that is transparent to applications and requires no changes to the underlying wireless drivers. However, MPTCP (as well as other bundling approaches) have only been evaluated to date in 60 GHz WLANs with laptop clients. In this work, we port for first time the MPTCP source code to a dual-band smartphone equipped with an 802.11ad and an 802.11ac radio. We discuss the challenges we face and the system-level optimizations required to enable the phone to support Gbps data rates and yield optimal MPTCP throughput (i.e., the sum of the individual throughputs of the two radios) under ideal conditions. We also evaluate for first time the power consumption of MPTCP in a dual-band 802.11ad/ac smartphone and provide recommendations towards the design of an energy-aware MPTCP scheduler. We make our source code publicly available to enable other researchers to experiment with MPTCP in smartphones equipped with millimeter wave radios.