VoLTE (Voice over LTE): This scheme is based on the IP Multimedia Subsystem (IMS) network and cooperates with the LTE control-level and media-level voice service standards formulated by GSMA in PRDIR.92 Using this scheme means that voice will be transmitted in the LTE network in the form of data stream, so there is no need to call the traditional circuit-switched network or keep the old network.
CSFB (Circuit Switched FallBack): The LTE network in this scheme will only be used for data transmission. When there is voice dialing or incoming call, the terminal will use the original circuit switched network. This scheme only needs operators to upgrade the existing MSC core network, and does not need to establish IMS network, so operators can introduce network services to the market more quickly. Also, because voice calls need to switch networks before they can be used, the call connection time will be extended.
Support both LTE and voice networks (SVLTE, both voice and LTE): This scheme uses terminals that can support both LTE networks and circuit-switched networks, so that operators do not need to make too many modifications to the existing networks. But it also means that the terminal is expensive and consumes power quickly.
Operators can also directly use Skype, Google Talk and other applications at the terminal to provide LTE voice services. However, in view of the current and foreseeable future, voice service charges will still contribute the most profits to operators, and this scheme is unlikely to be supported by most operators.
Most major LTE supporters have been inclined to and promoted VoLTE technology from the beginning. However, the lack of software related to the initial LTE terminal and core network equipment has led some operators to promote "Volga (LTE Voice over Universal Access)" as a temporary solution. This scheme is similar to general access network (also called unauthorized mobile access), so users can make voice calls using personal network connections (such as private wireless networks). However, VoLGA is not widely supported, because although VoLTE (IMS) needs a lot of investment to upgrade the voice infrastructure of the whole network, it can provide more flexible services. VoLTE will also need single radio voice call continuity (SRVCC) to ensure a smooth transition to 3G networks with low network signals.
Although the whole industry regards VoLTE as the future standard, the current demand for voice calls makes CSFB the law of operators' rights and interests. When there is an incoming call or outgoing call, the LTE mobile phone will use the original 2G or 3G network during the whole call. The data transmission speed of long-term evolution technology is faster than that of the traditional third-generation network. Samsung Electronics' latest smartphone Galaxy S III and Apple's smartphone iPhone 5 launched in San Francisco on Wednesday both support long-term evolution technology. Long term evolution technology is expected to become the next generation wireless network standard. Mastering a large number of long-term evolution technology patents can help enterprises avoid the threat of potential patent infringement litigation. This issue has become particularly important for Apple and Samsung Electronics, as the two companies are competing for the leader in the fast-growing smartphone market. On 20 1 1 year, Apple joined the consortium to jointly acquire the patent assets of Nortel Networks and obtained some 4G patents. These patents have also become potential weapons for the future struggle between Apple and Samsung Electronics.
According to the statistics of the Korean Intellectual Property Office on the documents of the European Telecommunications Standards Institute, by the end of June 20 12, Samsung Electronics had held 8 19 patents on long-term evolution technology, up 2 1% year-on-year, ranking first among global enterprises. Apple holds 365,438+08 long-term evolution technology management, which is the same as last year. Nokia holds 389 patents on long-term evolution technology.