Since the performance indicators of the current VoIP service fail to meet the quality of the existing circuit domain voice service, and the IMS needs to be deployed throughout the network, three different LTE voice solutions are formed on the basis of the existing network: based on the dual standby terminal. Solution, CSFB and VoLTE. Both CSFB and VoLTE are LTE voice solutions defined by 3GPP, both of which are clearly defined in the 3GPP specifications. VoLTE requires comprehensive support and optimization of terminals, wireless and core networks. From the current point of view, the implementation complexity is large. CSFB is a relatively simple voice solution proposed when the industry does not implement VoLTE. Dual standby: simple technology implementation The dual standby terminal can stand in the LTE network and the 3G/2G network at the same time, and can receive and transmit signals from both LTE and 3G/2G networks. The essence of the voice solution is to use the traditional 3G/2G network, which has nothing to do with LTE. A voice solution based on dual standby terminals is a relatively simple solution. The terminal chip can be implemented by two chips (one 3G/2G chip and one LTE chip) or one multi-mode chip, and there is no interoperation between LTE and 3G/2G mode, and the terminal does not need to implement different system measurement, technology. Simple to implement. CSFB: Gradually perfecting The main idea of ​​the CSFB solution is to re-access the LTE network back to the 3G/2G circuit domain when the user needs to perform voice service, and initiate or receive voice services according to the service process of the circuit domain. To implement CSFB, an SGs interface needs to be established between the MME and the MSC device of the 3G/2G network (shown by the purple line in Figure 1). SGs association plays a bridge role in CSFB technology, and can connect two different systems to realize the continuous voice service between users. The so-called SGs association is established for the user, that is, the address of the MME of the user is stored in the VLR, and the address of the VLR of the user is also stored in the MME. As can be seen from Figure 1, the CSFB technology affects the existing 3G/2G network. The MSC of the original network needs to add an SGs interface with the MME, and the SGSN adds an S3 interface with the MME. A terminal supporting CSFB must have multi-mode capability, and can access the EPC through E-UTRAN or the CS domain through GERAN/UTRAN. CSFB capable terminals must be able to perform joint RAU/LAU attachment, location update, and detach procedures. The MSC in the original 3G/2G network supports the CSFB function, needs to add the SGs interface to the MME, supports the SGs protocol stack, maintains the SGs association, and pages users, support and MME in parallel on the SGs interface and the Iu/A interface. Features such as joint mobility management. For the wireless subsystem (base station, base station controller) of the original 3G/2G network, it is necessary to increase the neighboring cell configuration of the LTE, so that the terminal can return to the LTE network as soon as possible after the voice service of the terminal after the CSFB to the 3G/2G network ends. The wireless subsystem of the original network needs to support the Fast Return function; in order to optimize the delay of the terminal from LTE to 3G/2G, the wireless subsystem of the original network needs to support the RIM function. 360 Laptop
360 laptop sometimes is also called as Yoga Laptop , cause usually has touch screen features. Therefore you can see other names at market, like 360 flip laptop, 360 Touch Screen Laptop,360 degree rotating laptop, etc. What `s the 360 laptop price? Comparing with intel yoga laptop. Usually price is similar, but could be much cheaper if clients can accept tablet 2 In 1 Laptop with keyboard. Except yoga type, the most competitive model for Hope project or business project is that 14 inch celeron n4020 4GB 64GB Student Laptop or 15.6 inch intel celeron business laptop or Gaming Laptop. There fore, just share the basic parameters, like size, processor, memory, storage, battery, application scenarios, SSD or SSD plus HDD, two enter buttons or one is also ok, if special requirements, oem service, etc. Then can provide the most suitable solution in 1 to 2 working days. Will try our best to support you.
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