Broadband -broadband, which should be a relative name at the beginning of this century when the bandwidth was very small compared with the 1990s, is a popular name, because it is neither a registered trademark nor a communication protocol. I still remember that the early installation of realplayer should be a version before 8, and you have been asked to choose whether it is 256k, 5 12k or 1.5M office bandwidth. The bandwidth in the early days was really not as wide as it is now.
Fixed network, which is easy to understand, is that compared with the current mobile network, the early dialing was transmitted through telephone lines, and now it includes optical fiber communication. All belong to the category of wide area network.
Wireless communication is divided into 3G and wlan.
In fact, 3G is also a general concept. In the field of voice, it has the concept of 2G, 3G and 4G generation, that is, the third generation communication. But now it basically refers to the wireless wide area network realized by wcdma, edge and hsdpa.
To the top, it is a wide area network, and even the Internet.
And wlan, wireless local area network, is wireless local area network, both of which are used to realize the data service of wireless terminal.
Ims(ip Multimedia Subsystem) should be like this, that is, ip Multimedia Subsystem is a general platform based on SIP, which can support a variety of access modes, both fixed and mobile, and realize the integration of fixed and mobile networks.
This is not a network, but a platform for telecom operators to realize unified management of fixed and mobile networks.
PHS is a kind of network, which is explained as follows:
PHS is a network system developed in Japan. Japanese people call it "personal handheld telephone system" (abbreviated as PHS, which is what we often call personal cordless local telephone system). This is ut Starcom's most famous thing in China. Others eliminated it and brought it to China for laying at the beginning of this century. It is called PHS, but as you know, the signal is not good. Not to mention the implementation of the data service mentioned above.