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MTSW-108-11-G-S-074

来源:LM317 Electronics Components编辑:SUN Electronic Industries时间:2021-06-14 04:05:13

Optogone is a company established last year in Plouzane, France to exploit research into liquid crystal and other display technologies at France Telecom's world-renowned optical communications R&D group, formerly known as CNET, and the ENST Bretagne Optics Department in Lannion.

This mode is the least efficient due to power consumed by repeatedly booting up the node. However, user intervention at the vehicle is not required and download latency is reasonably low.

A vehicular WLAN node must stay within a 1500 mA-hour budget between ignition cycles. Regardless of download progress, the node should be shut off when this limit is met. Beyond refining the hardware design, we proposed three listening techniques to reduce power consumption—Delayed Shutdown, Predetermined Wake-Up, and Periodic Wake-Up. A comparison of the three techniques is shown in Table 5 .

MTSW-108-11-G-S-074

Table 5:  Listening mode comparison

These methods allow intelligent listening to determine if a node-hotspot transfer should occur. Downloading large video files requires high efficiency. If our node is purely a digital audio player, efficiency may not be as important. If automatic downloads of weather and news are a major feature, the latency associated with Predetermined Wake-up would not be considered a negative factor. A budget lower than 1500 mA-hours may force a User Event to be required for Wake-up. The system's design requirements for efficiency, latency, and ease of use will determine which combination of modes to use.

MTSW-108-11-G-S-074

Stranding a driver at a hotspot is a safety concern. The driver needs to have a fully operational vehicle after all the data has been transferred. We developed the methods discussed in this article to maximize the convenience of a wireless network without jeopardizing vehicle safety.

MTSW-108-11-G-S-074

–High-quality video. H.26L offers consistently high video quality, even at low bit rates.

–Adaptation to delay constraints. H.26L can operate in a low-delay mode to adapt to real-time communications applications (such as videoconferencing), while allowing higher processing delay in applications with no delay constraints (such as video storage).

–Error resilience. H.26L provides the tools necessary to deal with packet loss in packet networks and bit errors in error-prone wireless networks.

–Network friendliness. A new feature is the conceptual separation between a video-coding layer, which provides the core high-compression representation of the video picture content, and a network adaptation layer, which packages that representation for delivery over a particular type of network. This facilitates packetization and improves information-priority control.

The above features translate into a number of advantages for video applications. Advantages for the specific application of videoconferencing are discussed at the end of this paper.

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