s****n
发帖数: 2305 | 1 比如说有个设备可以发射wifi信号，中间不经过任何中转（比如router之类的），然后
手机（智能机）就可以接收到这个设备通过wifi发送的数据。
在上面的例子里面，这个设备是AP吗？还是别的模式。
手机又是处于什么模式？记得手机一般就是连接router的wifi信号，这个设备不是wifi
也可以连接上吗？
谢谢！ | s****n
发帖数: 2305 | | L******t
发帖数: 1985 | 3 It's Wifi's Ad-hoc mode.
wifi
【在 s****n 的大作中提到】
: 比如说有个设备可以发射wifi信号，中间不经过任何中转（比如router之类的），然后
: 手机（智能机）就可以接收到这个设备通过wifi发送的数据。
: 在上面的例子里面，这个设备是AP吗？还是别的模式。
: 手机又是处于什么模式？记得手机一般就是连接router的wifi信号，这个设备不是wifi
: 也可以连接上吗？
: 谢谢！
| s****n
发帖数: 2305 | 4 thanks!
【在 L******t 的大作中提到】
: It's Wifi's Ad-hoc mode.
:
: wifi
| f*******8
发帖数: 3612 | 5 现在的手机有wifi direct模式，两个手机
直接建立无线连接，速度和wifi类似，比如我的galaxy note。
和传统ad hoc的差别，这里谈到了：
Wi-Fi Direct: What You Need To Know
http://www.pcmag.com/article2/0,2817,2371413,00.asp
It is official: Wi-Fi Direct is here, and the nonprofit Wi-Fi Alliance is
now certifying products as Wi-Fi Certified Wi-Fi Direct. Alliance members
include Apple, Cisco, Intel, and other major tech vendors.
Wi-Fi Direct is an emerging technology meant to meet the growing demand for
easy, portable wireless network connectivity. It's peer-to-peer wireless
networking, which means that devices such as notebooks, tablets, cameras,
and printers can "find" one another and establish wireless connectivity
without need of the presence of a wireless router, an access point, or a
hotspot.
How is it used? Imagine syncing your mobile device or laptop to a printer,
digital photo frame, or TV without connecting to a Wi-Fi network. No worry
about SSIDs or passwords to access them.
There are a few key features to know about Wi-Fi Direct:
•Wi-Fi Direct enlists a technology known as "Soft AP": Soft AP, in a
nutshell, is software-based access point functionality built into Wi-Fi
Direct certified devices. These devices are capable of routing and directing
network traffic just like access points and routers.
•Wi-Fi Direct is expected to provide superior connectivity over
Bluetooth: Wi-Fi Direct is not just an alternative to Bluetooth connectivity
; it delivers a better connection and has greater range than Bluetooth.
•Legacy Wi-Fi devices are supported: If you have one Wi-Fi Direct
certified device; that device can connect with 802.11n as well as b and g
devices.
•Wi-Fi Direct has built-in security: WPA2 is bundled into this
wireless standard and unlike traditional wireless routers and access points,
cannot be disabled.
•Applications are a driving factor of this technology: Portable
devices will be able to connect to the myriad of applications available
without need to connect to a Wi-Fi network.
•Wi-Fi Direct is not the same as ad-hoc networking: The most
significant difference between traditional ad-hoc wireless networking (
traditional peer-to-peer networking) and Wi-Fi Direct is security. In
Windows ad-hoc networks, the highest level of security supported is WEP in
mixed client environments (Windows 7 will support WPA2 provided all adapters
support it, as well). Wi-Fi Direct, as mentioned, supports WPA2. Another
difference, Wi-Fi Direct devices can also simultaneously connect to existing
wireless networks. More granular control and better discovery of devices
also differentiate Wi-Fi Direct from ad-hoc networking.
•Wi-Fi Direct is not meant to replace traditional wireless networks:
Wi-Fi Direct devices may not provide the overall range of a wireless router
or AP. There's more flexibility with APs and routers, as they can be placed
strategically to provide optimized signal strength. Also, there are security
considerations with Wi-Fi Direct; there is a good chance that IT
departments with corporate wireless networks may have issues with
controlling Wi-Fi Direct devices.
•There are products already Wi-Fi Direct certified: Wi-Fi Direct
certified products include Atheros XSPAN® Dual-band 802.11n PCIe Mini
Card (AR928x); Broadcom BCM43224; Intel® Centrino® Advanced-N 6200
internal PCIe half mini card; Ralink MIMObility 802.11n Reference Design ;
Realtek RTL8192CE-VA4 HM92C00 PCIe mini card. In addition, Cisco and Netgear
are rolling out Wi-Fi direct networking devices.
wifi
【在 s****n 的大作中提到】
: 比如说有个设备可以发射wifi信号，中间不经过任何中转（比如router之类的），然后
: 手机（智能机）就可以接收到这个设备通过wifi发送的数据。
: 在上面的例子里面，这个设备是AP吗？还是别的模式。
: 手机又是处于什么模式？记得手机一般就是连接router的wifi信号，这个设备不是wifi
: 也可以连接上吗？
: 谢谢！
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