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EP-3364711-B1 - METHOD OF PERFORMING PROCESS FOR VOICE SERVICE TERMINAL, AND DEVICE UTILIZING SAME, AND COMMUNICATION SYSTEM

EP3364711B1EP 3364711 B1EP3364711 B1EP 3364711B1EP-3364711-B1

Inventors

  • WANG, ZHENDONG
  • YANG, YONG
  • ZENG, MEIYAN

Dates

Publication Date
20260506
Application Date
20151112

Claims (5)

  1. A method for processing a terminal that is performing a voice service in a scenario in which inter-radio access technology redirection is performed by a radio access network, RAN, device, comprising: determining (S210), by the RAN device, to release a radio resource control, RRC, connection of a terminal, wherein the terminal is performing a guaranteed bit rate, GBR, bearer-based voice service; and instructing (S220), by the RAN device, a core network, CN, device to retain a GBR bearer of the terminal in an RRC connection release process of the terminal, wherein the retained GBR bearer is a GBR bearer of the voice service that is being performed by the terminal, or all GBR bearers of the terminal; and sending (S230), by the RAN device, an RRC connection release message to the terminal, wherein the RRC connection release message carries a frequency, which is a frequency of an inter-system neighboring cell, and a frequency of an original serving cell; and the instructing the CN device to retain the GBR, comprises: sending, by the RAN device, a release message to the CN device, wherein the release message carries cause value information that is used to instruct the CN device to retain the GBR bearer of the terminal, wherein the cause value information is user inactivity or inter-radio access technology redirection, and wherein the cause value information is used for the terminal that is performing the GBR bearer-based voice service; wherein the RAN device determines, in the following case, to release the RRC connection of the terminal: the terminal enters an overlapping area of frequency division duplex, FDD, and time division duplex, TDD, and the terminal does not support switching between the FDD and the TDD.
  2. The method according to claim 1, wherein the release message comprises an S1 user equipment context release request message.
  3. A radio access network, RAN, device for processing a terminal that is performing a voice service in a scenario in which inter-radio access technology redirection is performed by the RAN device, comprising: a determining unit (510), configured to determine to release a radio resource control, RRC, connection of a terminal, wherein the terminal is performing a guaranteed bit rate, GBR, bearer-based voice service; and an instruction unit (520), configured to instruct a core network, CN, device to retain a GBR bearer of the terminal in an RRC connection release process of the terminal, wherein the retained GBR bearer is a GBR bearer of the voice service that is being performed by the terminal, or all GBR bearers of the terminal, and the instruction unit (520) is further configured to send a release message to the CN device, wherein the release message carries cause value information that is used to instruct the CN device to retain the GBR bearer of the terminal, wherein the cause value information is user inactivity or inter-radio access technology redirection, and wherein the cause value information is used for the terminal that is performing the GBR bearer-based voice service; and an air interface releasing unit (530), configured to send an RRC connection release message to the terminal, wherein the RRC connection release message carries a frequency, which is a frequency of an inter-system neighboring cell, and a frequency of an original serving cell; wherein the determining unit (510) determines, in the following case, to release the RRC connection of the terminal: the terminal enters an overlapping area of frequency division duplex, FDD, and time division duplex, TDD, and the terminal does not support switching between the FDD and the TDD.
  4. The RAN device according to claim 3, wherein the release message comprises an S1 user equipment context release request message.
  5. A computer program, comprising instructions that, when executed by a radio access network, RAN, device, cause the RAN device to perform the method according to any one of claims 1 to 2.

Description

TECHNICAL FIELD This application relates to the field of wireless communications technologies, and in particular, to a method and RAN device for processing a terminal that is performing a voice service. BACKGROUND With development of communications technologies, a radio network continuously evolves. Currently, an all-Internet Protocol (Internet Protocol, IP) architecture is implemented in a Long Term Evolution (Long Term Evolution, LTE) network. Because the LTE network supports only a packet switched (Packet Switching, PS) domain service, a voice service is borne on an IP transport network, and therefore is referred to as a Voice over Internet Protocol (Voice over Internet Protocol, VOIP) service. The VOIP service is also referred to as a VoLTE service in an LTE system. With large-scale use of the LTE network, the VOIP service is increasingly popular. How to improve voice communication quality is gaining more attention. ALCATEL-LUCENT ET AL, "Handling of intra-LTE redirection", vol. RAN WG3, no. Seoul, Korea; 20140519 - 20140523, (20140518), 3GPP DRAFT; R3-141156_REDIRECT, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE; 650, ROUTE DES LUCIOLES; F-06921 SOPHIA-ANTIPOLIS CEDEX; FRANCE, URL: http://www.3gpp.org/ftp/Meetings_3GPP_SYNC/RAN1/RAN3/Docs/, (20140518), XP050790711, describes a handling method of intra-LTE redirection. "3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; General Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access (Release 11)", 3GPP STANDARD; 3GPP TS 23.401, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE; 650, ROUTE DES LUCIOLES; F-06921 SOPHIA-ANTIPOLIS CEDEX; FRANCE, (20140310), vol. SA WG2, no. V11.9.0, pages 1 - 286, XP050769627, discloses an S1 release procedure. SUMMARY In view of this, embodiments of this application provide a method and RAN device for processing a terminal that is performing a voice service, to reduce a call drop rate in a voice communication process and improve user experience. The present invention relates to a method, a RAN device and a computer program as set forth in claims 1, 3 and 5. Further embodiments are set forth in the dependent claims. It can be learned that, in the foregoing aspects, the RAN device actively redirects the voice service terminal, releases the RRC connection of the terminal, and instructs the CN device to retain the GBR bearer of the voice service terminal in the release process. Because a bearer type of the VOIP service is a GBR bearer, the bearer of the VOIP service is not released. When the terminal accesses a network again, the CN device may directly use the GBR bearer to restore the voice service, so as to avoid voice service interruption caused by releasing the bearer of the VOIP service in a redirection process, reduce the call drop rate, and improve user experience. It can be learned that, in the aspects of this application, the RAN device actively redirects the voice service terminal, releases the RRC connection of the terminal, and instructs the CN device to retain the GBR bearer of the voice service terminal in the release process. Because the bearer type of the VOIP service is the GBR bearer, the bearer of the VOIP service is not released. When the terminal accesses the network again, the CN device may directly use the GBR bearer to restore the voice service, so as to avoid voice service interruption caused by releasing the bearer of the VOIP service in the redirection process, reduce the call drop rate, and improve user experience. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic diagram of a communications system according to an embodiment of this application;FIG. 2 is a flowchart of a method for processing a terminal that is performing a voice service according to an embodiment of this application;FIG. 3 is a flowchart of another method for processing a terminal that is performing a voice service according to an embodiment of this application;FIG. 4 is a signaling flowchart of a redirection process according to an embodiment of this application;FIG. 5 is a schematic diagram of an apparatus for processing a terminal that is performing a voice service according to an embodiment of this application;FIG. 6 is a schematic diagram of another apparatus for processing a terminal that is performing a voice service according to an embodiment of this application;FIG. 7 is a schematic structural diagram of a RAN device according to an embodiment of this application;FIG. 8 is a schematic diagram of an apparatus for processing a terminal that is performing a voice service according to an embodiment of this application;FIG. 9 is a schematic diagram of another apparatus for processing a terminal that is performing a voice service according to an embodiment of this this case, the CN device may further include a determining unit, and the determining unit is configured to perform the operat