Wi-Fi CERTIFIED Wi-Fi Direct®是一項認證標誌，代表設備之間支援Wi-Fi直接互聯，幫助用戶以更為簡單而便捷的方式完成列印、共享、同步以及顯示等任務。具備Wi-Fi Direct標誌的產品無需加入傳統的家庭、辦公或熱點網路即可以互相連接。
利用這種技術，手機、相機、打印機、個人電腦以及遊戲設備將能夠直接互連，以迅速而輕鬆的方式傳輸內容、共享應用。Wi-Fi Direct既支援一對一直接互連，亦能够支援多部設備同時連接。連接Wi-Fi Direct認證設備的操作簡單方便，按下按鈕、同時點擊兩個支援NFC的設備，或輸入PIN碼這三種方法均可實現連接。此外，所有的Wi-Fi Direct連接都採用WPA2™加密方式，這是Wi-Fi最新的安全技術。通過Wi-Fi Direct，您將無需連接點或互聯網連接，便可在任何地方自由使用個人Wi-Fi網絡。
通過Wi-Fi Direct認證的設備可用於各類應用，進行內容共享、數據資料同步、社交、玩遊戲、播放音頻與視像等所有Wi-Fi設備現在能够幫您做到的事情，並且更加簡單便捷，您無需四處奔走尋找互聯網連接。Wi-Fi Direct認證設備幾乎能與您現有的所有Wi-Fi CERTIFIED™設備相互連接。創建一個小組，您只需一個Wi-Fi Direct設備。現在，Wi-Fi不僅只是一項聯網工具，同時亦是將您與您朋友相互連接的Wi-Fi設備，為您提供隨時隨地的便捷互聯生活。
即使沒有Wi-Fi網絡，Wi-Fi Direct設備亦可以隨時隨地實行互聯。Wi-Fi Direct設備向區域內其他設備發出訊號，告知相關設備即將可以創建連接。用戶可以查看能與之建立連接的設備，發送連接要求，或者亦可能收到連接至另一設備的邀請。當兩個或兩個以上的Wi-Fi Direct-certified設備直接互聯，它們便組成了一個Wi-Fi Direct小組，這個小組支援Wi-Fi Protected Setup™並且採用Wi-Fi最新的安全加密方式。
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- What are the pre-defined services for Wi-Fi Direct?
Optional standardized services allow users to “discover, connect and do” in a single step:
- Wi-Fi Direct Send lets users send and receive content between one or more devices quickly and easily with minimal user interaction
- Miracast® connections over Wi-Fi Direct give users the ability to display photos, files and video on multiple screens through updated device and service discovery mechanisms
- Wi-Fi Direct for DLNA® lets devices discover each other before connecting to stream content on devices which support DLNA interoperability guidelines
- Wi-Fi Direct Print gives users the ability to print documents directly from a smartphone, tablet or PC with a single command
- What is the Wi-Fi Direct Toolkit?
The optional Wi-Fi Direct Toolkit provides third party developers with a standardized developer interface to the platform for building applications to run on Wi-Fi Direct connections.
- How do companies use the Wi-Fi Direct trademark?
The term “Wi-Fi CERTIFIED Wi-Fi Direct®” designates products that have been certified by Wi-Fi Alliance, and is the commercial name for the certification program. The underlying specification or technology is called “Wi-Fi Peer-to-Peer Specification”. Only products which have completed and passed Wi-Fi certification to the Wi-Fi Peer-to-Peer test plan may use the Wi-Fi Direct name. On second instance, you may refer to “Wi-Fi Direct" products (dropping the term Wi-Fi CERTIFIED). There is no special logo or visual indicator for Wi-Fi Direct.
- How is Miracast related to Wi-Fi Direct?
Wi-Fi Direct allows devices to connect directly to each other, without the need for a Wi-Fi access point (AP). It simply requires the push of a button, the entry of a PIN, or tapping two NFC-capable devices together. Wi-Fi Direct allows source and display devices to discover one another and provides the underlying device-to-device connectivity for Miracast. Miracast builds upon Wi-Fi Direct with mechanisms to negotiate video capabilities, setup content protection (if needed), stream content, and maintain the video session.
- What is the difference between TDLS and Wi-Fi Direct?
TDLS operates in the background of a Wi-Fi network to optimize performance, while Wi-Fi Direct-certified devices can quickly connect to one another while on the go, even when a Wi-Fi network is unavailable. Many devices will be certified for both solutions and use them in different situations.
- What about power management protocols? Are devices implementing the technology behind Wi-Fi Direct a power hog?
Most Wi-Fi Direct-certified devices are power-sensitive, and in many cases, battery-powered. Wi-Fi Direct-certified devices can support the Power Save feature certified under the WMM program, and the specification underlying the Wi-Fi Direct program also defines new power saving mechanisms.
- Can a device simultaneously connect to a regular Wi-Fi network and a group of Wi-Fi Direct-certified devices at the same time?
All devices certified under the Wi-Fi Direct program allow the user to connect to an infrastructure or a Wi-Fi Direct-certified network. Some devices certified under the Wi-Fi Direct program support connections to both an infrastructure network and Wi-Fi Direct-certified group at the same time (e.g. a laptop may support an infrastructure connection while also belonging to a Wi-Fi Direct-certified group). Simultaneous connection to a Wi-Fi Direct-certified group and an infrastructure network is an optional feature.
- If I make a Wi-Fi Direct group with another person, can they see all of the contents of my device?
Not without your permission. The content available over a Wi-Fi Direct group connection is driven by the applications you are using. While there may be applications which allow an authorized use to “browse” the content on your device, most applications will have a specific focus (e.g., sharing a game application or transferring photos).
- Can a network based on devices certified under the Wi-Fi Direct program cross connect to an infrastructure network for internet connectivity?
Yes. A single device in a Wi-Fi Direct-certified group network may share internet connectivity with other devices in the network by creating simultaneous infrastructure and Wi-Fi Direct connections. A network of devices certified under the Wi-Fi Direct program operates in a security domain separate from the infrastructure network, even when cross-connected.
- Do products certified under the Wi-Fi Direct program interoperate with my other Wi-Fi devices?
Yes. A Wi-Fi CERTIFIED Wi-Fi Direct device is able to make device group connections with existing Wi-Fi CERTIFIED gear.
- Can all devices start a network based on the specification underlying the Wi-Fi Direct program?
All Wi-Fi Direct-certified devices can start a group, based on the specification underlying the Wi-Fi Direct program, but it’s most likely that devices with more computing power (laptops, handsets, gaming devices) will more frequently manage the network than those with less power (digital cameras, printers, etc.).
- How does service discovery work?
The Wi-Fi Peer-to-Peer Services Technical Specification further defines a simplified standard for devices to advertise and discover services in nearby devices.
- How does security work for Wi-Fi Direct-certified products?
Group networks based on the specification underlying the Wi-Fi Direct program operate in a security domain that is independent from any infrastructure network. This means that they have protection of the security features certified under the WPA2 program, but are managed separately from the security system in the AP-based network (home, enterprise, hotspot). This means both the group networks based on the specification underlying the Wi-Fi Direct program and the infrastructure networks can be protected, but users don’t need credentials for the infrastructure network to connect to the network based on the specification underlying the Wi-Fi Direct program.
- How does Wi-Fi Alliance help ensure product compatibility and a good user experience for certified products?
Compatibility and quality are achieved through rigorous testing of Wi-Fi products. Consumers should always look for the Wi-Fi CERTIFIED logo to ensure the best user experience possible.
- How does the specification underlying the Wi-Fi Direct certification program work?
The underlying specification connects devices using an approach similar to the traditional AP-to-client connection used in Wi-Fi CERTIFIED infrastructure networks. One Wi-Fi Direct-certified device provides the connection to other participants in a group of Wi-Fi Direct-certified devices in lieu of an AP. A device certified under the Wi-Fi Direct program does not require special hardware compared to traditional Wi-Fi AP devices.
- How far does a Wi-Fi Direct connection travel?
Wi-Fi CERTIFIED Wi-Fi Direct devices work just like any Wi-Fi device, with ranges up to 200 meters. They can connect from just a few feet away, but also across a home. This means that making a Wi-Fi Direct group connection will be convenient, even when devices aren’t in immediate proximity to one another.
- How fast is Wi-Fi Direct?
Wi-Fi CERTIFIED Wi-Fi Direct supports typical Wi-Fi speeds, which can be as high as 250 Mbps. Even at lower speeds, Wi-Fi provides plenty of throughput for transferring multimedia content with ease. The performance of a particular group of Wi-Fi Direct devices depends on whether the devices are 802.11a, g, or n, as well as the particular characteristics of the devices and the physical environment.
- How many devices can connect?
A Wi-Fi Direct-certified network can be one-to-one, or one-to-many. The number of devices in a Wi-Fi Direct-certified group network is expected to be smaller than the number supported by traditional standalone access points intended for consumer use. Connection to multiple other devices is an optional feature that will not be supported in all Wi-Fi Direct-certified devices; some devices will only make 1:1 connections.
- Does the specification underlying the Wi-Fi Direct certification program work on both frequency bands?
Yes, the specification underlying the Wi-Fi Direct certification program supports operation in both 2.4 GHz and 5 GHz. Devices operating in the 2.4 GHz frequency band only and devices operating in both the 2.4 GHz and 5 GHz frequency bands can be certified under the Wi-Fi Direct program. Not all Wi-Fi Direct-certified devices support both frequency bands, however, so you should check which bands your devices support.
- Which Wi-Fi Direct-certified device will create and manage the connection?
Devices conduct a negotiation to determine which device is most appropriate. This may be determined by considering a number of factors including but not limited to power management, number of connections supported, richness of user interface and services being offered. The Wi-Fi Direct-certified device that offers the connection manages the creation, admission to, presence and termination of that network implementing the specification underlying the Wi-Fi Direct program.