System for carrying out video caching, transcoding and transmission through utilization of vehicular APs and working method thereof

Abstract

The invention discloses a system for carrying out video caching, transcoding and transmission through utilization of vehicular APs and a working method thereof. The system mainly comprises the vehicular APs, a mobile device, a controller and a video server. The controller collects location, speed and working channel information of the vehicular APs, responds to a query request of the mobile device, calculates expected throughput between the vehicular APs and the mobile device according to a throughput model, and provides a candidate vehicular AP list, the expected throughput and expected communication time for the mobile device. The mobile device selects the suitable vehicular AP for connection according to the candidate vehicular AP list, the expected throughput and the expected communication time. A video client adjusts a video request bit rate according to expected average throughput of the connected vehicular AP. According to the system and the working method, the throughput of themobile device can be improved through full utilization of the vehicular APs, and the video watching experience of a user is improved.

Description

technical field [0001] The invention belongs to the field of network technology, and specifically relates to a system and a working method for increasing network access bandwidth based on a vehicle-mounted network, and improving user viewing experience through caching and online transcoding. Background technique [0002] With the continuous development of mobile communication technology and the continuous popularization of mobile devices, the volume of mobile video traffic is huge and growing rapidly, which puts forward higher and higher requirements for network capacity and user experience. Most mobile devices are equipped with multiple network interface cards, such as WiFi, LTE, Bluetooth, etc., and can also be expanded through USB ports. The MPTCP protocol can enable mobile devices to use multiple wireless interfaces simultaneously or alternately, and switch without interrupting the connection in a mobile environment, improving throughput and robustness. [0003] Due to ...

AI Technical Summary

Problems solved by technology

[0004] 1. In order to discover the surrounding vehicle APs, the mobile device needs to scan multiple channels, which will bring a large time overhead and shorten the service time

[0005] 2. In a mobile environment, the distance between vehicle-mounted APs and mobile devices may continue to change, and traditional RSSI-based AP selection strategies cannot describe AP performance well.

[0006] 3. Traditional wireless devices will only trigger AP switching when the RSSI is lower than a certain threshold. In a mobile environment, this switching strategy has obvious hysteresis, and will miss better connection opportunities, and cannot make full use of available resources.

[0007] 4. The speed and direction of different vehicle-mounted APs are quite different, resulting in large fluctuations in network conditions in a mobile environment. It is difficult for video clients to accurately predict network bandwidth, which may easily cause frequent video freezes and reduce user experience.

[0008] 5. When caching multi-bit rate video, there is a conflict between storage space and cache effectiveness

Caching video blocks of all bit rates will result in waste of storage space, and storing video blocks of partial bit rates will reduce the effectiveness of the cache

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