1、 ETSI TR 125 903 V15.0.0 (2018-07) Universal Mobile Telecommunications System (UMTS); Continuous connectivity for packet data users (3GPP TR 25.903 version 15.0.0 Release 15) TECHNICAL REPORT ETSI ETSI TR 125 903 V15.0.0 (2018-07)13GPP TR 25.903 version 15.0.0 Release 15Reference RTR/TSGR-0625903vf0
2、0 Keywords UMTS ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-Prfecture de Grasse (06) N 7803/88 Important notice The present document can be dow
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13、ument does not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks. Foreword This Technical Report (TR) has been produced by ETSI 3rd Generation Partnership Project (3GPP). The present document may refer to technical specifications or reports usi
14、ng their 3GPP identities, UMTS identities or GSM identities. These should be interpreted as being references to the corresponding ETSI deliverables. The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under http:/webapp.etsi.org/key/queryform.asp. Modal verbs terminology In
15、the present document “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 deliverables except when u
16、sed in direct citation. ETSI ETSI TR 125 903 V15.0.0 (2018-07)33GPP TR 25.903 version 15.0.0 Release 15Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 6g3Introduction 6g31 Scope 7g32 References 7g33 Definitions, symbols and abbreviations . 8g33.1 Definiti
17、ons 8g33.2 Symbols 8g33.3 Abbreviations . 8g34 Technical concepts . 9g34.1 New DPCCH slot format 10g34.1.1 Description of the concept 10g34.1.1.1 General description . 10g34.1.1.2 Detailed proposals . 12g34.1.1.2.1 SIR target adjustment 12g34.1.1.2.2 CPC initiation and termination 13g34.1.2 Analysis
18、 of the concept . 14g34.1.2.1 Simulation results on UL TPC error rate . 14g34.1.2.2 Simulation results on other UL channels 17g34.1.2.2.1 CQI transmission. 18g34.1.2.2.2 HARQ-ACK transmission . 25g34.1.2.2.3 Observations from simulations of HS-DPCCH performance in sub-clauses 4.1.2.2.1 and 4.1.2.2.2
19、 . 30g34.1.2.3 Conclusions from TPC performance (sub-clause 4.1.2.1) and HS-DPCCH performance (sub-clause 4.1.2.2) . 31g34.1.2.4 Power control delay. 31g34.1.3 Benefits of the concept . 32g34.1.4 Open issues of the concept 32g34.2 Uplink DPCCH gating 32g34.2.1 Description of the concept 32g34.2.1.1
20、General principle . 32g34.2.1.2 Basic packet traffic example . 33g34.2.1.3 VoIP traffic example . 33g34.2.1.4 Operation of the uplink DPCCH gating 34g34.2.2 Analysis of the concept . 36g34.2.2.1 Power control stability 36g34.2.2.2 F-DPCH performance . 39g34.2.2.3 Uplink link performance . 43g34.2.2.
21、3.1 Additional link level results . 45g34.2.2.3.2 Link level results for CQI decoding and for large TB sizes 53g34.2.2.3.3 Preamble detection link level result for uplink DPCCH gating with long gating gap . 59g34.2.2.4 System performance 61g34.2.2.4.1 Simulation assumptions . 61g34.2.2.4.2 VoIP resu
22、lts with and without gating 2 ms TTI 61g34.2.2.4.3 VoIP results with and without gating 10 ms TTI and packet bundling 63g34.2.2.4.4 VoIP results - Summary 65g34.2.2.4.5 Impact of inactive users to cell throughput 65g34.2.2.4.6 System-level performance with high-velocity UEs . 67g34.2.2.5 UE battery
23、saving calculations 69g34.2.3 Benefits of the concept . 72g34.2.4 Open issues of the concept 72g34.3 SIR_target reduction. 72g3ETSI ETSI TR 125 903 V15.0.0 (2018-07)43GPP TR 25.903 version 15.0.0 Release 154.3.1 Description of the concept 72g34.3.1.1 L1 signalling approach 72g34.3.1.1.1 Interworking
24、 aspects 74g34.3.1.1.2 Handling of VoIP traffic 74g34.3.1.2 L2 signalling approach 75g34.3.1.2.1 New parameters for L2 signalling approach 76g34.3.1.3 Approach with predefined/configured rules 76g34.3.2 Analysis of the concept . 77g34.3.2.1 Simulation of the concept 77g34.3.2.1.1 Simulation assumpti
25、ons. 77g34.3.2.1.2 Simulation results 78g34.3.2.2 Noise rise caused by UL DPCCH . 80g34.3.2.3 Potential gain in terms of number of additional users 2 presented to TSG for approval; 3 or greater indicates TSG approved document under change control. y the second digit is incremented for all changes of
26、 substance, i.e. technical enhancements, corrections, updates, etc. z the third digit is incremented when editorial only changes have been incorporated in the document. Introduction Packet-oriented features like HSDPA and E-DCH in WCDMA/UMTS systems will promote the subscribers desire for continuous
27、 connectivity, where the user stays connected over a long time span with only occasional active periods of data transmission, and avoiding frequent connection termination and re-establishment with its inherent overhead and delay. This is the perceived mode a subscriber is used to in fixed broadband
28、networks (e.g. DSL) and a precondition to attract users from fixed broadband networks. To support a high number of HSDPA users in the code limited downlink the feature F-DPCH was introduced in REL-6. In the uplink, the limiting factor for supporting a similarly high number of E-DCH users is the nois
29、e rise. For such a high number of users in the cell it can be assumed that many users are not transmitting any user data for some time (e.g. for reading during web browsing or in between packets for periodic packet transmission such as VoIP).The corresponding overhead in the noise rise caused by mai
30、ntained control channels will significantly limit the number of users that can be efficiently supported. As completely releasing dedicated channels during periods of traffic inactivity would cause considerable delays for reestablishing data transmission and a corresponding bad user perception, this
31、WI is intended to reduce the impact of control channels on uplink noise rise while maintaining the connections and allowing a much faster reactivation for temporarily inactive users. ETSI ETSI TR 125 903 V15.0.0 (2018-07)73GPP TR 25.903 version 15.0.0 Release 151 Scope The present document summarize
32、s the work done under the WI “Continuous Connectivity for Packet Data Users“ defined in 1 by listing technical concepts addressing the objectives of the work item (see below), analysing these technical concepts and selecting the best solution (which might be a combination of technical concepts). “Th
33、e objective of this work item is to reduce the uplink noise rise from physical control channels of packet data users, e.g. for users which have temporarily no data transmission. This is intended to significantly increase the number of packet data users (i.e. HS-DSCH/E-DCH users without UL DPDCH) in
34、the UMTS FDD system that can stay in CELL_DCH state over a long time period, without degrading cell throughput, and that can restart transmission after a period of inactivity with a much shorter delay ( 3.3 Abbreviations For the purposes of the present document, the following abbreviations apply: AC
35、K Acknowledgement CQI Channel Quality Indicator CPC Continuously Packet Connected or Continuous Packet Connectivity CRC Cyclic Redundancy Check DCH Dedicated Channel DL Downlink DPCCH Dedicated Physical Control Channel DPCH Dedicated Physical Channel DPDCH Dedicated Physical Data Channel DTX Discont
36、inuous Transmission E-DCH Enhanced Dedicated Channel E-DPCCH E-DCH Dedicated Physical Control Channel E-DPDCH E-DCH Dedicated Physical Data Channel E-AGCH E-DCH Absolute Grant Channel E-HICH E-DCH HARQ Acknowledgement Indicator Channel ETSI ETSI TR 125 903 V15.0.0 (2018-07)93GPP TR 25.903 version 15
37、.0.0 Release 15E-RGCH E-DCH Relative Grant Channel F-DPCH Fractional Dedicated Physical Channel HSDPA High Speed Downlink Packet Access HS-DSCH High Speed Downlink Shared Channel HS-PDSCH High Speed Physical Downlink Shared Channel HS-SCCH High Speed Physical Downlink Shared Control Channel NACK Neg
38、ative Acknowledgement P-CCPCH Primary Common Control Physical Channel RL Radio LinkS-CCPCH Secondary Common Control Physical Channel SCH Synchronisation Channel SIR Signal-to-Interference RatioTFC Transport Format Combination TPC Transmit Power Control TPC CER TPC Command Error Rate TTI Transmission
39、 Time Interval UE User Equipment UL Uplink UTRAN UMTS Terrestrial Radio Access Network 4 Technical concepts This section describes and analyses the suggested technical concepts addressing the problem described by the work item “Continuous Connectivity for Packet Data Users” defined in 1. This sectio
40、n 4 includes feasible concepts to address the WI without claiming that the concepts are complete or restricting the addition of alternatives. The following common base for all concepts can be assumed: - Packet data users in CELL_DCH state using HSDPA and E-DCH as described in REL-6 are addressed. -
41、The UE is and will remain in the CELL_DCH RRC state whatever continuous connectivity concept will be applied. - The signalling radio bearers (SRBs) are assumed to be mapped on HS-DSCH in downlink (as is necessary for F-DPCH, anyway) and on E-DCH in uplink. - UL channels present in this case: UL DPCC
42、H, HS-DPCCH, E-DPCCH, E-DPDCH (E-DPCCH, E-DPDCH are DTXed when no data (or rate requests) needs to be transmitted on E-DPDCH). - DL channels present in this case: F-DPCH, HS-SCCH, HS-PDSCH, E-AGCH, E-RGCH, E-HICH. To avoid DL channelization code limitations F-DPCH instead of DL DPCCH is considered.
43、Different phases during the stay in the CELL_DCH state can be distinguished by the activity of the data channels: - Packet on HS-PDSCH is transmitted to the UE in the TTI. - inactive DL: No packet is transmitted on HS-PDSCH to the UE in the TTI. - Packet on E-DPDCH is transmitted to the Node B in th
44、e TTI. - inactive UL: No packet is transmitted on E-DPDCH to the Node B in the TTI. It is the aim that the application of a continuous connectivity concept will not affect the performance of a transmission in an active TTI. The description of the active and inactive phases does not preclude the way
45、and whether or not CELL_DCH substates should be introduced. The continuous connectivity concepts are addressing the control channels (i.e. one or more) during inactive phases in UL and/or DL. The triggers for initiating and terminating the use of a continuous connectivity concept relative to the sta
46、rt and end of active and inactive phases depend on the considered concept. For example: - whether the concept is triggered when there is inactivity in just one direction (i.e. only DL, only UL) or in both directions (UL ETSI ETSI TR 125 903 V15.0.0 (2018-07)103GPP TR 25.903 version 15.0.0 Release 15
47、- whether a transition from activity to inactivity will directly trigger the application of the concept or whether there is a short period of inactive phase without applying the concept (e.g. if a timer is used to trigger the concept); - whether very short periods of DL and/or UL inactivity (e.g. du
48、ring transmission of VoIP packets or where a UE is not scheduled but data is waiting in the scheduler queue) could also be addressed by a continuous connectivity concept. - whether during an inactive phase the concept is used during transmission of physical layer signalling (e.g. on HS-DPCCH or HS-S
49、CCH). The period during which a continuous connectivity concept is applied is called “Continuously Packet Connected mode“ or shorter “CPC mode“. Transitions between the different phases: The following transitions are called “ CPC initiation“: - active phase to CPC mode - inactive phase where REL-6 is applied as usual to CPC mode while the transition back is called “CPC termination“: - CPC mode to active phase. - CPC mode to inactive phase where REL-6 is applied as usual Triggers for the transitions and a description of the signalling (e.g. L1 or L2 signalling) or the
