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EP-4736397-A1 - INTERNET PROTOCOL MULTIMEDIA SUBSYSTEM NODE, PACKET SWITCHED CORE NETWORK NODE AND METHODS IN A WIRELESS COMMUNICATIONS NETWORK

EP4736397A1EP 4736397 A1EP4736397 A1EP 4736397A1EP-4736397-A1

Abstract

A method performed by an Internet Protocol Multimedia Subsystem (IMS) node is provided. The method is for handling a failure of setting up voice Quality of Service, QoS, resources relating to an incoming voice call to a User Equipment (UE) in a wireless communications network. The wireless communications network supports a Packet 5 Switched (PS) access domain. The IMS node sends (201) a first request to a PS Core Network (CN) node. The first request will trigger the PS CN node to setup of the voice QoS resources via the PS access domain. The IMS node receives (202) a first indication from the PS CN node. The first indication is indicating a first failure of setting up the voice QoS resources via the PS access domain according to the first request. The which first 10 failure is a temporary failure. The IMS node sends (203) a second request to the PS CN node. The second request will retrigger the PS CN node to again setup the voice QoS bearer via the PS access domain. The IMS node receives a second indication from the PS CN node. The second indication is indicating any one out of: (i) a second failure with a cause, or (ii) a success, of setting up the voice QoS resources via the PS access domain, 15 retriggered according to the second request.

Inventors

  • GARCIA FERNANDEZ, Raimundo
  • ABTIN, AFSHIN
  • SURDILA, SORIN

Assignees

  • Telefonaktiebolaget LM Ericsson (publ)

Dates

Publication Date
20260506
Application Date
20230627

Claims (20)

  1. 1. A method performed by an Internet Protocol Multimedia Subsystem, IMS, node (130) for handling a failure of setting up voice Quality of Service, QoS, resources relating to an incoming voice call to a User Equipment, UE, (121) in a wireless communications network (100), which wireless communications network (100) supports a Packet Switched, PS, access domain, the method comprising: sending (201) a first request to a PS Core Network, CN, node (151), which first request will trigger the PS CN node (151) to setup of the voice QoS resources via the PS access domain, receiving (202) a first indication from the PS CN node (151), which first indication is indicating a first failure of setting up the voice QoS resources via the PS access domain according to the first request, which first failure is a temporary failure, sending (203) a second request to the PS CN node (151), which second request will retrigger the PS CN node (151) to again setup the voice QoS bearer via the PS access domain, receiving (204) a second indication from the PS CN node (151), which second indication is indicating any one out of: (i) a second failure with a cause, or (ii) a success, of setting up the voice QoS resources via the PS access domain, retriggered according to the second request.
  2. 2. The method according to claim 1 , wherein the wireless communications network (100) further supports a Circuit Switched, CS, access domain, and wherein the second indication indicates (i) a second failure with a cause, the method further comprising: sending (205) a third request to a CS CN node (152), which third request will trigger the CS CN node (152) to setup the voice QoS resources via the CS access domain, receiving (206) a third indication from the CS CN node (152), which third indication is indicating any one out of: (iii) a third failure, or (iv) a success, of setting up the voice QoS resources via the CS access domain according to the third request.
  3. 3. The method according to any of the claims 1-2, wherein the temporary failure comprises insufficient bearer resources.
  4. 4. The method according to any of the claims 1-3, wherein the voice QoS resources comprises any one out of: a voice QoS bearer or a QoS flow.
  5. 5. The method according to any of the claims 1-4, wherein any one or more out of: the IMS node (130) comprises any one or more out of: an Interrogating Call Session Control Function, l-CSCF, a Serving Call Session Control Function, S- CSCF, a Terminating Telephony Application Server, Term TAS, the PS CN node (151) comprises a Policy Control Function (PCF) node, the CS CN node (152) comprises an MSC/MGCF node.
  6. 6. A computer program (830) comprising instructions, which when executed by a processor (810), causes the processor (810) to perform actions according to any of the claims 1-5.
  7. 7. A carrier (840) comprising the computer program (830) of claim 6, wherein the carrier (840) is one of an electronic signal, an optical signal, an electromagnetic signal, a magnetic signal, an electric signal, a radio signal, a microwave signal, or a computer-readable storage medium.
  8. 8. A method performed by a Packet Switched, PS, Core Network, CN, node (151) for handling a failure of setting up voice Quality of Service, QoS, resources, relating to an incoming voice call to a User Equipment, UE, (121) in a wireless communications network (100), which wireless communications network (100) supports a Packet Switched, PS, access domain, the method comprising: receiving (301) a first request from an Internet Protocol Multimedia Subsystem, IMS, node (130), which first request is triggering (302) the PS CN node (151) to setup the voice QoS resources via the PS access domain, failing (303) the triggered setup of the voice QoS resources via the PS access domain according to the first request, due to a temporary failure, sending (304) a first indication to the IMS node (130), which first indication is indicating a first failure of setting up the voice QoS resources via the PS access domain according to the first request, which first failure is a temporary failure, receiving (305) a second request from the IMS node (130), which second request is retriggering (306) the PS CN node (151) to again setup the voice QoS bearer via the PS access domain, sending (307) a second indication to IMS node (130), which second indication is indicating any one out of: (i) a second failure with a cause, or (ii) a success, of setting up the voice QoS resources via the PS access domain, retriggered according to the second request.
  9. 9. The method according to claim 8, wherein the temporary failure comprises insufficient bearer resources.
  10. 10. The method according to any of the claims 8-9, wherein the voice QoS resources comprises any one out of: a voice QoS bearer or a QoS flow.
  11. 11. The method according to any of the claims 8-10, wherein any one or more out of: the IMS node (130) comprises any one or more out of: an Interrogating Call Session Control Function, l-CSCF, a Serving Call Session Control Function, S- CSCF, a Terminating Multimedia Telephony Application Server, Term TAS, the PS CN node (151) comprises a Policy Control Function (PCF) node.
  12. 12. A computer program (930) comprising instructions, which when executed by a processor (910), causes the processor (910) to perform actions according to any of the claims 8-11.
  13. 13. A carrier (940) comprising the computer program (930) of claim 12, wherein the carrier (940) is one of an electronic signal, an optical signal, an electromagnetic signal, a magnetic signal, an electric signal, a radio signal, a microwave signal, or a computer-readable storage medium.
  14. 14. An Internet Protocol Multimedia Subsystem, IMS, node (130) configured to handle a failure of setting up voice Quality of Service, QoS, resources, relating to an incoming voice call to a User Equipment, UE, (121) in a wireless communications network (100), which wireless communications network (100) is adapted to support a Packet Switched, PS, access domain, the IMS node (130) further being configured to: send a first request to a PS Core Network, CN, node (151), which first request will trigger the PS CN node (151) to setup of the voice QoS resources via the PS access domain, receive a first indication from the PS CN node (151), which first indication is adapted to indicate a first failure of setting up the voice QoS resources via the PS access domain according to the first request, which first failure is adapted to be a temporary failure, send a second request to the PS CN node (151), which second request will retrigger the PS CN node (151) to again setup the voice QoS bearer via the PS access domain, receive a second indication from the PS CN node (151), which second indication is adapted to indicate any one out of: (i) a second failure with a cause, or (ii) a success, of setting up the voice QoS resources via the PS access domain, retriggered according to the second request.
  15. 15. The IMS node (130) according to claim 14, wherein the wireless communications network (100) further is adapted to support a Circuit Switched, CS, access domain, and wherein the second indication is adapted to indicate (i) a second failure with a cause, the IMS node (130) further being configured to: send a third request to a CS CN node (152), which third request will trigger the CS CN node (152) to setup the voice QoS resources via the CS access domain, receive a third indication from the CS CN node (152), which third indication is adapted to indicate any one out of: (iii) a third failure, or (iv) a success, of setting up the voice QoS resources via the CS access domain according to the third request.
  16. 16. The IMS node (130) according to any of the claims 14-15, wherein the temporary failure is adapted to comprise insufficient bearer resources.
  17. 17. The IMS node (130) according to any of the claims 14-16, wherein the voice QoS resources is adapted to comprise any one out of: a voice QoS bearer or a QoS flow.
  18. 18. The IMS node (130) according to any of the claims 14-17, wherein any one or more out of: the IMS node (130) is adapted to comprise any one or more out of: an Interrogating Call Session Control Function, l-CSCF, a Serving Call Session Control Function, S-CSCF, a Terminating Multimedia Telephony Application Server, Term TAS, the PS CN node (151) is adapted to comprise a Policy Control Function (PCF) node, the CS CN node (152) is adapted to comprise an MSC/MGCF node.
  19. 19. A Packet Switched, PS, Core Network, CN, node (151) configured to handle a failure of setting up voice Quality of Service, QoS, resources relating to an incoming voice call to a User Equipment, UE, (121) in a wireless communications network (100), which wireless communications network (100) is adapted to support a PS access domain, the PS CN node (151) further being configured to: receive a first request from an Internet Protocol Multimedia Subsystem, IMS, node (130), which first request is adapted to trigger the PS CN node (151) to setup the voice QoS resources via the PS access domain, fail the triggered setup of the voice QoS resources via the PS access domain according to the first request, due to a temporary failure, send a first indication to the IMS node (130), which first indication is adapted to indicate a first failure of setting up the voice QoS resources via the PS access domain according to the first request, which first failure is a temporary failure, receive a second request from the IMS node (130), which second request is adapted to retrigger the PS CN node (151) to again setup the voice QoS bearer via the PS access domain, send a second indication to IMS node (130), which second indication is adapted to indicate any one out of: (i) a second failure with a cause, or (ii) a success, of setting up the voice QoS resources via the PS access domain, retriggered according to the second request.
  20. 20. The PS CN node (151) according to claim 19, wherein the temporary failure is adapted to comprise insufficient bearer resources.

Description

INTERNET PROTOCOL MULTIMEDIA SUBSYSTEM NODE, PACKET SWITCHED CORE NETWORK NODE AND METHODS IN A WIRELESS COMMUNICATIONS NETWORK TECHNICAL FIELD Embodiments herein relate to an Internet Protocol Multimedia Subsystem (IMS) network node, and a Packet Switched (PS) Core Network (CN) node methods therein. In some aspects, they relate to handling a failure of setting up voice Quality of Service (QoS) resources relating to an incoming voice call to a User Equipment (UE) in a wireless communications network. BACKGROUND In a typical wireless communication network, wireless devices, also known as wireless communication devices, mobile stations, stations (STA) and/or User Equipment (UE), communicate via a Wide Area Network or a Local Area Network such as a Wi-Fi network or a cellular network comprising a Radio Access Network (RAN) part and a Core Network (CN) part. The RAN covers a geographical area which is divided into service areas or cell areas, which may also be referred to as a beam or a beam group, with each service area or cell area being served by a radio network node such as a radio access node e.g., a Wi-Fi access point, a Base Station (BS) or a radio base station (RBS), which in some networks may also be denoted, for example, a Base Station (BS), a NodeB, eNodeB (eNB), or gNodeB (gNB) as denoted in Fifth Generation (5G) telecommunications. A service area or cell area is a geographical area where radio coverage is provided by the radio network node. The radio network node communicates over an air interface operating on a radio frequency with the wireless devices within the range of the radio network node. 3rd Generation Partnership Project (3GPP) is the standardization body for specifying the standards for the cellular system evolution, e.g., including 3G, 4G, 5G and the future evolutions. Specifications for Evolved Universal Terrestrial Radio Access (E- UTRA) and Evolved Packet System (EPS) have been completed within the 3GPP. In 4G also called a Fourth Generation (4G) network, EPS is core network and E-UTRA is radio access network. In 5G, 5G Core (5GC) is core network, NR is radio access network. As a continued network evolution, the new release of 3GPP specifies a 5G network also referred to as 5G New Radio (NR) and 5GC. Frequency bands for 5G NR are being separated into two different frequency ranges, Frequency Range 1 (FR1) and Frequency Range 2 (FR2). FR1 comprises sub-6 GHz frequency bands. Some of these bands are bands traditionally used by legacy standards but have been extended to cover potential new spectrum offerings from 410 MHz to 7125 MHz. FR2 comprises frequency bands from 24.25 GHz to 52.6 GHz. Bands in this millimeter wave range have shorter range but higher available bandwidth than bands in the FR1. Multi-antenna techniques may significantly increase the data rates and reliability of a wireless communication system. For a wireless connection between a single user, such as UE, and a base station (BS), the performance is in particular improved if both the transmitter and the receiver are equipped with multiple antennas, which results in a Multiple-Input Multiple-Output (MIMO) communication channel. This may be referred to as Single-User (SU)-MIMO. In the scenario where MIMO techniques is used for the wireless connection between multiple users and the base station, MIMO enables the users to communicate with the base station simultaneously using the same time-frequency resources by spatially separating the users, which increases further the cell capacity. This may be referred to as Multi-User (MU)-MIMO. Note that MU-MIMO may benefit when each UE only has one antenna. The cell capacity can be increased linearly with respect to the number of antennas at the BS side. Due to that, more and more antennas are employed in BS. Such systems and/or related techniques are commonly referred to as massive MIMO. The vast majority of wireless voice networks today support two different types of accesses domains. A Circuit Switched (CS) domain using 2G/3G access, for CS Voice. Further, a Packet Switched (PS) domain may be used to deliver PS Voice using 4G/5G access and Internet Protocol Multimedia Subsystem (IMS). The PS Voice technology for 4G Access is Voice over LTE (VoLTE), while for 5G access it may be either Evolved Packet System Fallback (EPS-FB) or Voice over NR (VoNR). An idle mobile phone will connect to a cell in a domain that offers the best radio conditions at a certain time. Moreover, at any time, a mobile phone involved in a voice call may handover from one domain to another in order to provide the best available coverage. Since the CS core network associated to the CS domain is very different from the PS core network associated to the PS domain, the network needs to use different technologies and procedures to deliver a call in CS, using e.g. Mobile Application Part (MAP), Integrated services digital network User Part (ISUP), compared to delivering it in PS, using e.g. Session Initiation P