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Method and apparatus for establishing volte call

專利號
US10149346B2
公開日期
2018-12-04
申請人
Telefonaktiebolaget LM Ericsson (publ)（SE Stockholm）
發(fā)明人
Yingjiao He; Juying Gan; Chengqiong Xie
IPC分類
H04W76/10; H04W76/36; H04W76/38; H04W76/25; H04W76/16
技術領域
volte,ue,call,sip,ims,rab,ringing,ecm,timer,message
地域： Stockholm

摘要

A method and apparatus for establishing a Voice over LTE (Long Term Evolution) (VoLTE) call in a communication network are provided. After a request for establishing a VoLTE call is received, a user equipment (UE) involved in the VoLTE call that is in LTE coverage can be identified. One or more dummy messages are send to the identified UE after the VoLTE call enters into ringing phase. An interval between successive dummy messages is shorter than a first time period set for determining whether to release radio resource for supporting the VoLTE call in LTE coverage. Sending the dummy message can be stopped if the VoLTE call is answered or is cancelled. As a consequence, time spending on establishing a VoLTE call is shortened and good performance characteristics is achieved, and signallings on networks are reduced.

說明書

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As shown on FIG. 2a, when the originating UE 210 is to make a VoLTE call to a terminating UE, it may initiate a service request procedure to change its status from ECM (EPS connection Management)-IDLE to ECM-CONNECTED. ECM-CONNECTED means E-RAB is established between UE 210 and EPC. To start a SIP session, UE 210 sends SIP INVITE message to IMS/AS 230 via eNodeB 220. IMS/AS 230 transfers SIP 180 RINGING message to UE 210 upon receipt of SIP 180 RINGING message from the terminating UE.

An inactivity timer in eNodeB 220 is set to expire when there is no user plane packet on E-RAB established between UE 210 and EPC in a predefined time period. If no user plane packets are exchanged on E-RAB, i.e. E-RAB is unused, at expiration of the inactivity timer, the E-RAB is released, and UE 210 changes to ECM-IDLE status. At this time, since the call is neither answered nor cancelled, the SIP session is not completed.

Thereafter, as shown on FIG. 2a, IMS/AS 230 may receive a SIP answer message (200 OK [INVITE]) for answering the call from the terminating UE. Upon receipt of the SIP answer message, IMS/AS 230 transfers it to the VoLTE UE via EPC. This results in Network Triggered Service Request procedure to change status of UE 210 from ECM-IDLE to ECM-CONNECTED again. This means E-RAB between UE 210 and EPC is reestablished for continuing the SIP session. When UE 210 is in ECM-CONNECTED status, the SIP answer message is sent to it.

權利要求

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