Wi-Fi Direct


「Wi-Fi CERTIFIED Wi-Fi Direct®」は、Wi-Fi Directを実装しているデバイスの証明の印です。このテクノロジによってWi-Fiデバイスを直接接続し、これまで以上に簡単・手軽に印刷、情報の供給、同期化、表示を行えるようになります。 「Wi-Fi Direct」認定が表示されている製品は、従来のホーム ネットワークやオフィス ネットワーク、ホットスポットなどがない環境でも、それぞれを直接接続することができます。

Wi-Fi Directを使用することで、携帯電話やカメラ、プリンタ、PC、ゲーム機などのデバイス間で簡単かつスピーディにコンテンツを転送したりアプリケーションを共有したりできます。デバイス間の接続は1対1だけでなく、複数のデバイスのグループを同時に接続することが可能です。ボタンを押すか2つのNFC対応デバイスをお互いにタッピングする、またはPIN (暗証番号) を入力するだけの簡単な操作で、Wi-Fi Direct認定デバイス間の接続を確立できます。すべてのWi-Fi Direct接続は最新のWi-Fiセキュリティ テクノロジであるWPA2™によって保護されます。Wi-Fi Directでは、AP (アクセスポイント) やインターネット接続も必要ありません ―― いつでも、どこでも、パーソナルなWi-Fi ネットワークでデバイス間の接続を実現できます。

事前定義済のオプション サービスによって、異なるメーカーのデバイス間でファイルの送信、文書の印刷、メディアの再生、画面の表示などを簡単に行えます。これらの高品質な標準サービスによって、ユーザーはワンステップで「発見、接続、実行」して、よく行うタスクを処理できます。 さらに、この新しいサービス プラットフォームによって、デバイス間の直接接続のメリットを活かした、新しいアプリケーション開発の革新的な機会が創出されます。

インターネット接続なしでWi-Fi Directを活用

Wi-Fi Direct認定デバイスはあらゆるタイプのアプリケーションに利用できます。ユーザーは、コンテンツの共有やデータの同期化、コミュニケーションの促進、ゲーム プレイ、オーディオ/ビデオの再生など、今日Wi-Fi デバイスで行っていることを、インターネット接続を気にすることなく簡単に行えるようになります。Wi-Fi Direct認定デバイスは、現在お使いのほぼすべてのWi-Fi CERTIFIED™ デバイスと接続することが可能で、Wi-Fi Directデバイスが1台あれば、複数の既存のWi-Fi CERTIFIEDデバイスと接続してグループを構成できます。このテクノロジにより、Wi-Fiは単なるインターネットへのアクセスの手段にとどまらず、いつでもどこでもすべてのユーザーやその友人のすべてのWi-Fiデバイスを接続し、快適なコネクテッド ライフを実現します。

Wi-Fi Direct 接続 - いつでも、どこでも

Wi-Fi Directデバイスは、たとえWi-Fiネットワークにアクセスできない場所でさえも、時と場所を選ばずいつでもどこでも接続できます。Wi-Fi Direct デバイスは、近接する他のデバイスに接続が可能であることを知らせる信号を発信します。 ユーザーは接続できる周辺のデバイスを確認して接続をリクエストするか、他のデバイスからの接続リクエストを受信することができます。2台以上のWi-Fi Direct認定デバイスを直接接続すると、Wi-Fi Protected Setup™ および最新のWi-Fi セキュリティ保護下でWi-Fi Direct グループが確立されます。

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Frequently Asked Questions
  • How does Wi-Fi Alliance help ensure product compatibility and a good user experience for certified products?

    Compatibility and quality are achieved through testing of Wi-Fi products. Consumers should always look for the Wi-Fi CERTIFIED logo to ensure the best user experience possible.


  • 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.

  • Does the specification underlying the Wi-Fi Direct certification program work on both 2.4 GHz and 5 GHz 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.

  • How many devices can connect?

    A Wi-Fi Direct-certified network can be one-to-one, or one-to-many. Connection to multiple other devices is an optional feature that will not be supported in all Wi-Fi Direct devices; some devices will only make 1:1 connections.

  • Which Wi-Fi Direct 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 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.

  • What about power management protocols? Are devices implementing the technology behind Wi-Fi Direct a power hog?

    Most Wi-Fi Direct devices are power sensitive, and in many cases, battery powered. Wi-Fi Direct devices can support the Power Save feature certified under the WMM® program, and the specification underlying the Wi-Fi Direct program also defines power saving mechanisms.

  • Can a device simultaneously connect to a regular Wi-Fi network and a group of Wi-Fi Direct 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 network. Some devices certified under the Wi-Fi Direct program support connections to both an infrastructure network and Wi-Fi Direct 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 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, such as sharing a game application or transferring photos.

  • 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 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 security work for Wi-Fi Direct 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 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 device provides the connection to other participants in a group of Wi-Fi Direct 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.

  • 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.

  • How far does a Wi-Fi Direct connection travel?

    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 Direct supports Wi-Fi speeds up to 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.