1、 ETSI TR 103 219 V1.1.1 (2015-04) Speech and multimedia Transmission Quality (STQ); Quality of Service aspects of voice communication in an LTE environment TECHNICAL REPORT ETSI ETSI TR 103 219 V1.1.1 (2015-04) 2 Reference DTR/STQ-00198m Keywords CSFB, QoS, VoLTE ETSI 650 Route des Lucioles F-06921
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7、ng restriction extend to reproduction in all media. European Telecommunications Standards Institute 2015. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM and LTE are Trade Marks of ETSI registered for the ben
8、efit of its Members and of the 3GPP Organizational Partners. GSM and the GSM logo are Trade Marks registered and owned by the GSM Association. ETSI ETSI TR 103 219 V1.1.1 (2015-04) 3 Contents Intellectual Property Rights 5g3Foreword . 5g3Modal verbs terminology 5g3Introduction 5g31 Scope 6g32 Refere
9、nces 6g32.1 Normative references . 6g32.2 Informative references 6g33 Abbreviations . 7g34 Circuit-Switched Fall Back 7g34.1 General overview of CSFB 7g34.2 Amendments to existing QoS parameters 8g34.2.1 CSFB Call Setup Failure Ratio % 8g34.2.1.1 Preconditions . 8g34.2.1.2 Abstract definition . 8g34
10、.2.1.3 Abstract equation 9g34.2.1.4 Trigger points 9g34.2.2 CSFB Call Setup Time s 9g34.2.2.1 Preconditions . 9g34.2.2.2 Abstract definition . 9g34.2.2.3 Abstract equation 9g34.2.2.4 Trigger points 10g34.3 Proposed new QoS parameters in the context of CSFB . 10g34.3.1 Overview 10g34.3.2 CSFB Failure
11、 Ratio % - Calling party 10g34.3.2.1 Preconditions . 10g34.3.2.2 Abstract definition . 10g34.3.2.3 Abstract equation 10g34.3.2.4 Trigger points 11g34.3.3 CSFB Time s - Calling party 11g34.3.3.1 Preconditions . 11g34.3.3.2 Abstract definition . 11g34.3.3.3 Abstract equation 11g34.3.3.4 Trigger points
12、 11g34.3.4 CSFB Failure Ratio % - Called party . 12g34.3.4.1 Preconditions . 12g34.3.4.2 Abstract definition . 12g34.3.4.3 Abstract equation 12g34.3.4.4 Trigger points 12g34.3.5 CSFB Time s - Called party . 12g34.3.5.1 Preconditions . 12g34.3.5.2 Abstract definition . 12g34.3.5.3 Abstract equation 1
13、3g34.3.5.4 Trigger points 13g34.3.6 CSFB Return to LTE Failure Ratio % 13g34.3.6.1 Preconditions . 13g34.3.6.2 Abstract definition . 13g34.3.6.3 Abstract equation 13g34.3.6.4 Trigger points 13g34.3.7 CSFB Return to LTE Time s 14g34.3.7.1 Preconditions . 14g34.3.7.2 Abstract definition . 14g34.3.7.3
14、Abstract equation 14g34.3.7.4 Trigger points 14g3ETSI ETSI TR 103 219 V1.1.1 (2015-04) 4 5 VoLTE (IMS based) . 14g35.1 Overview 14g35.2 Amendments to existing QoS parameters 16g35.2.1 VoLTE Session Setup Failure Ratio % 16g35.2.1.1 Preconditions . 16g35.2.1.2 Abstract definition . 16g35.2.1.3 Abstra
15、ct equation 16g35.2.1.4 Trigger points 16g35.2.2 VoLTE Session Setup Time s 16g35.2.2.1 Preconditions . 16g35.2.2.2 Abstract definition . 17g35.2.2.3 Abstract equation 17g35.2.2.4 Trigger points 17g35.2.3 VoLTE Session Cut-off Ratio % 17g35.2.3.1 Preconditions . 17g35.2.3.2 Abstract definition . 17g
16、35.2.3.3 Abstract equation 17g35.2.3.4 Trigger points 18g35.3 Proposed new QoS parameters in the context of VoLTE . 18g35.3.1 Overview 18g35.3.2 IMS Registration Success Ratio % . 18g35.3.2.1 Preconditions . 18g35.3.2.2 Abstract definition . 19g35.3.2.3 Abstract equation 19g35.3.2.4 Trigger points 1
17、9g35.3.3 IMS Registration Time s 19g35.3.3.1 Preconditions . 19g35.3.3.2 Abstract definition . 19g35.3.3.3 Abstract equation 19g35.3.3.4 Trigger points 20g35.3.4 SRVCC Success Ratio % . 20g35.3.4.1 Preconditions . 20g35.3.4.2 Abstract definition . 20g35.3.4.3 Abstract equation 20g35.3.4.4 Trigger po
18、ints 20g35.3.5 SRVCC Time s . 20g35.3.5.1 Preconditions. 20g35.3.5.2 Abstract definition . 21g35.3.5.3 Abstract equation 21g35.3.5.4 Trigger points 21g3History 22g3ETSI ETSI TR 103 219 V1.1.1 (2015-04) 5 Intellectual Property Rights IPRs essential or potentially essential to the present document may
19、 have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in ETSI SR 000 314: “Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI st
20、andards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (http:/ipr.etsi.org). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not r
21、eferenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Foreword This Technical Report (TR) has been produced by ETSI Technical Committee Speech and multimedia Transmission Quality (STQ). Modal verbs terminology In
22、the present document “shall“, “shall not“, “should“, “should not“, “may“, “need not“, “will“, “will not“, “can“ and “cannot“ are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisions). “must“ and “must not“ are NOT allowed in ETSI deli
23、verables except when used in direct citation. Introduction LTE networks are a reality in many markets. CS voice interworking is one of the most crucial points in many networks in Europe. Voice services used on LTE enabled handsets in an LTE environment bring along new QoS aspects which are not yet c
24、overed in i.1, e.g.: CSFB, a procedure where the UE operating in LTE mode issues a special service request and the network signals the device to move (fall back) to 2G/3G to accept incoming calls or to place outgoing calls; VoLTE, Voice over IP in LTE networks using a dedicated packet bearer and SIP
25、 signalling. It is based on the IP Multimedia Subsystem (IMS) network with specific profiles for control and media planes. This approach results in the voice service being delivered as data flow within the LTE data bearer. The two scenarios mentioned above, very frequently encountered in European ne
26、tworks and worldwide, present specific QoS issues that need to be addressed in detail. Alternative approaches exist to carry voice calls in LTE networks such as SVLTE (Simultaneous Voice and LTE Data) and VoLGA (Voice Over LTE via Generic Access). However, these are not addressed in the present docu
27、ment as they have only limited industrial support at the time of publication of the present document. ETSI ETSI TR 103 219 V1.1.1 (2015-04) 6 1 Scope The aim of the present document is to identify and describe important aspects, related QoS parameters, their trigger points and calculation methods in
28、 the context of voice communication taking place in an LTE environment. 2 References 2.1 Normative references References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-s
29、pecific references, the latest version of the referenced document (including any amendments) applies. Referenced documents which are not found to be publicly available in the expected location might be found at http:/docbox.etsi.org/Reference. NOTE: While any hyperlinks included in this clause were
30、valid at the time of publication, ETSI cannot guarantee their long term validity. The following referenced documents are necessary for the application of the present document. Not applicable. 2.2 Informative references References are either specific (identified by date of publication and/or edition
31、number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the referenced document (including any amendments) applies. NOTE: While any hyperlinks included in this clause were valid at the time of publication
32、ETSI cannot guarantee their long term validity. The following referenced documents are not necessary for the application of the present document but they assist the user with regard to a particular subject area. i.1 ETSI TS 102 250-2 (V2.2.1): “Speech and multimedia Transmission Quality (STQ); QoS a
33、spects for popular services in mobile networks; Part 2: Definition of Quality of Service parameters and their computation“. i.2 ETSI TS 123 272 (V11.6.0): “Digital cellular telecommunications system (Phase 2+);Universal Mobile Telecommunications System (UMTS); LTE; Circuit Switched (CS) fallback in
34、Evolved Packet System (EPS); Stage 2 (3GPP TS 23.272 version 11.6.0 Release 11)“. i.3 ETSI TS 123 216 (V8.7.0): “Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); LTE; Single Radio Voice Call Continuity (SRVCC); Stage 2 (3GPP TS 23.216 version
35、8.7.0 Release 8)“. i.4 ETSI TS 123 237 (V10.7.0): “Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); LTE; IP Multimedia Subsystem (IMS) Service Continuity; Stage 2 (3GPP TS 23.237 version 10.7.0 Release 10)“. i.5 ETSI TS 123 216 (V11.11.0): “Di
36、gital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); LTE; Single Radio Voice Call Continuity (SRVCC); Stage 2 (3GPP TS 23.216 version 11.11.0 Release 11)“. i.6 ETSI TS 124 228 (V5.14.0): “Digital cellular telecommunications system (Phase 2+); Univer
37、sal Mobile Telecommunications System (UMTS); Signalling flows for the IP multimedia call control based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3 (3GPP TS 24.228 version 5.14.0 Release 5)“. ETSI ETSI TR 103 219 V1.1.1 (2015-04) 7 3 Abbreviations For the purp
38、oses of the present document, the following abbreviations apply: 2G 2nd Generation (mobile networks) 3G 3rd Generation (mobile networks) 3GPP 3rd Generation Partnership Project 4G 4th Generation (mobile networks) CC Call Control CM Connection Management CS Circuit Switched CSFB Circuit Switched Fall
39、-Back DL DownLink DTM Dual Transfer Mode EMM EPS Mobility Management eNodeB Evolved Node B EPS Evolved Packet System E-UTRAN evolved UMTS Terrestrial Radio Access Network GERAN GSM EDGE Radio Access Network GSM Global System for Mobile communications HO HandOverIMS IP Multimedia Subsystem IP Interne
40、t Protocol IP-CAN IP Connectivity Access Network IRAT Inter-Radio Access Technology LTE Long-Term Evolution MME Mobility Management Entity NAS Non-Access Stratum P-CSCF Proxy-Call Session Control Function PS Packet Switched QoS Quality of Service RRC Radio Resource Control S-CSCF Serving-Call Server
41、 Control Function SIB System Information Block SIP Session Initiation Protocol SRVCC Single Radio Voice Call Continuity STQ Speech and multimedia Transmission Quality SVLTE Simultaneous Voice and LTE Data UE User Equipment UL UpLink UMTS Universal Mobile Telecommunications System UTRAN UMTS Terrestr
42、ial Radio Access Network VoLGA Voice over LTE Generic Access VoLTE Voice over LTE 4 Circuit-Switched Fall Back 4.1 General overview of CSFB Initially, operators are introducing LTE for packed data services only. For stationary fixed line substitution scenarios this was possible without special regar
43、ds to existing circuit switched voice services. As LTE is now available on more and more Smartphones and VoLTE is only starting to be commercially deployed, many operators have integrated the circuit-switched fall back option to offer voice services to LTE-enabled handsets. ETSI ETSI TR 103 219 V1.1
44、.1 (2015-04) 8 Therefore, a CS-capable Device registered to LTE needs to fall back to UMTS or even GSM before originating or terminating a voice call. This can have influence on the perceived service quality in terms of: longer service access time for the voice service; higher risk of failing servic
45、e access, in particular for mobile-terminated calls; interruption of the data service during the CSFB and continuation in slower UMTS network (or interruption of the data service for the whole duration of the voice call in case of CSFB to GSM, if DTM is not available in the network). Figure 1: Mobil
46、e Originating call in Active Mode - PS HO supported (figure taken from ETSI TS 123 272 i.2) 4.2 Amendments to existing QoS parameters 4.2.1 CSFB Call Setup Failure Ratio % 4.2.1.1 Preconditions For a valid calculation the following preconditions need to be met: LTE coverage should be present. The UE
47、 should be registered to the LTE network. CSFB feature should be enabled in the network and supported by the UE. 4.2.1.2 Abstract definition This parameter is the probability that the CSFB terminal cannot setup a call. ETSI ETSI TR 103 219 V1.1.1 (2015-04) 9 4.2.1.3 Abstract equation 100 attempt set
48、up Call CSFB allattempt setup Call CSFB ulunsuccessf% Ratio Failure Setup Call CSFB =4.2.1.4 Trigger points Event from abstract equation Trigger point from users point of view Technical description/protocol part CSFB Call Setup attempt Start: User initiates call by pushing the call button. Start: “R
49、RC Connection Request“ with cause “mo_Data“, if present. Otherwise: “EMM Extended Service request (CS fallback indicator)“ message is sent by calling party. Successful CSFB Call Setup attempt Stop: Alerting tone heard by calling party and called party rings. Stop: The “ALERTING“ message is received by calling party. Unsuccessful CSFB Call Setup attempt Stop: Calling party receives a notification that the call set-up is cancelled or does not receive any notification at all within a pre-determined time. Stop: S
