Method and device for indicating and identifying cause of signaling connection establishment

Abstract

The invention relates to a signaling connection establishment cause indication method, a signaling connection establishment cause identification method, a signaling connection establishment cause indication device and a signaling connection establishment cause identification device. The methods comprise the following steps that user equipment (UE) resides in a second network system after receiving an RRC (radio resource control) message in a first network system, sets values of a first variable and a second variable in pre-reorientation information carried by an RRC connection establishment request message, and transmits the request message to an access network control node in the second network system; the access network control node in the second network system acquires the values of the first and second variables in the pre-reorientation information carried by the request message after receiving the RRC connection establishment request message; and whether an establishment cause for RRC connection is a CSFB (circuit switched fall back) call or not is identified according to the two values. Therefore the CSFB call can be accurately identified through the access network control node in the second network system, and admission control in an RRC connection establishment stage is realized.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a method and device for indicating and identifying the cause of signaling connection establishment. Background technique [0002] An LTE (Long Term Evolution, long-term evolution) network, that is, an E-UTRA network, does not support a CS (Circuit Switched, circuit switched) domain, and therefore does not support voice services based on the CS domain. The E-UTRA network can fall back to the 2G / 3G network, and use the CS domain of the 2G / 3G system to provide voice services for the UE (User Equipment, user equipment) side. The redirection method may be used for the UE to transfer from the E-UTRA network CSFB (CS FallBack, circuit domain fallback) to the UMTS (Universal Mobile Telecommunications System, Universal Mobile Telecommunications System) network. [0003] Under the existing technology, when E-UTRA redirects the UE to the 2G or 3G network, the UE notifies the core netw...

AI Technical Summary

Problems solved by technology

[0003] Under the existing technology, when E-UTRA redirects the UE to the 2G or 3G network, the UE notifies the core network at the stage of initiating a service request. This is a CSFB call. After the service is completed, the MSC (MobileSwitching Centre, mobile switching center) In the Iu release command message, a source is carried to notify the RNC (Radio Network Controller, radio resource controller) that the call is a CSFB call; the disadvantage of this scheme is that the RNC can only recognize the CSFB call in the service completion stage, which affects the UE's ability to use radio resources. Admission control during the control connection establishment phase

The UE can also add a CSFB call indication to the variable establishment cause (Establishment cause) when sending a radio resource control connection establishment message in the UMTS network, so that the RNC can receive the radio resource control connection establishment cause; the disadvantage of this solution is that the ASN needs to be modified .1, and when the establishment reason is a CSFB call, the UE will not be able to report other characteristics of the establishment reason

Images