A method, device and system for returning to long-term evolution LTE network

Abstract

The invention discloses a method, equipment and system for returning to an LTE network, relating to the field of communication technology, enabling UE to return to the LTE PLMN registered before CSFB after the end of CSFB service, ensuring the continuity of PS service and avoiding unnecessary PLMN Switch between networks to improve user experience. The method of the present invention includes: after the CSFB service of the UE ends, the base station receives the PLMN ID of the UE registered LTE network sent by the serving MSC / VLR of the UE; determines the LTE frequency band information according to the PLMN ID; and sends the connection release message containing the LTE frequency band information to the UE so that the UE returns to the LTE PLMN corresponding to the previously registered PLMN ID. The embodiments of the present invention are mainly used in the process of returning to the LTE network after the CSFB service ends.

Description

technical field [0001] The present invention relates to the field of communication technologies, and in particular to a method, device and system for returning to a Long Term Evolution (LTE) network after a Circuit Switched Fallback (CSFB) service ends. Background technique [0002] A Circuit Service (CS) network is a wireless network that provides circuit domain services such as voice calls. For example, 2G / 3G wireless networks such as GSM and WCDMA are widely covered. At the same time, with the development of network technology, a packet domain (Packet Service, PS) network dedicated to providing data services, such as a Long Term Evolution (LTE) network, is also being deployed on a large scale. Therefore, in the current communication network, CS domain network and PS domain network coexist, operators can use 2G / 3G network to provide users with circuit domain services, and use LTE network to provide users with data services. [0003] Based on this network coverage method, ...

AI Technical Summary

Problems solved by technology

[0004] In the process of returning to the LTE network, the inventors found that there are at least the following problems in the prior art: after the CS domain voice service is completed, the UE may be covered by LTE networks of multiple different PLMNs, such as the LTE network where the UE registered before CSFB Both the PLMN and the LTE network of the current CS serving PLMN are available to the UE

If the UE reselects to the LTE network of another PLMN, the data service suspended in the LTE PLMN registered before the CSFB service is triggered cannot be recovered, resulting in the termination of the ongoing data service and unnecessary handover between PLMNs , affecting the user's business experience

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