UMTS course. Introduction UMTS principles. UMTS Evolution. UMTS Project

Transcription

1 UMTS course Introduction UMTS principles Network Architecture WCDMA Basics General Protocols Model Radio Resource Management and ATM transmission UMTS Evolution HSDPA TDD All IP UMTS Project Network Architecture and Design Rollout System Acceptance Testing Network Performances Launch 1

2 Radio Interface Protocols Architecture Control Plane User Plane RRC control Radio Bearers L3 control control control control PDCP BMC RLC RLC RLC RLC RLC RLC RLC RLC L2 MAC PHY (WCDMA L1) Logical Channels Transport Channels L1 2

3 Uu interface Layer 1 Services L1 services : Information transfer to MAC and higher layers on common and dedicated transport channels: Random Access Channel (RACH) Common Packet Channel (CPCH) Forward Access Channel (FACH) Downlink Shared Channel (DSCH) Broadcast Channel (BCH) Paging Channel (PCH) Dedicated Channel (DCH) 3

4 Uu interface Layer 1 Functions L1 functions: Macrodiversity distribution/combining and soft handover execution Error detection on transport channels and indication to higher layers FEC encoding/decoding and interleaving/deinterleaving of transport channels Multiplexing of transport channels and demultiplexing of coded composite transport channels Rate matching Mapping of coded composite transport channels on physical channels; Power weighting and combining of physical channels Modulation and spreading/demodulation and despreading of physical channels Frequency and time (chip, bit, slot, frame) synchronisation Measurements and indication to higher layers (e.g. FER, SIR, interference power, transmit power, etc.) Closed-loop power control RF processing 4

5 Medium Access Control Protocol: MAC Services MAC Services to upper Layer: Data transfer service on logical channels classified in control and traffic channels Reallocation of radio resources and MAC parameters. Reporting of measurements. 5

6 Medium Access Control Protocol: MAC Functions MAC Functions: Mapping between logical channels and transport channels. Selection of appropriate Transport Format for each Transport Channel depending on instantaneous source rate. Priority handling between data flows of one UE. Priority handling between UEs by means of dynamic scheduling Identification of UEs on common transport channels Multiplexing/demultiplexing of upper layer PDUs into/from transport blocks delivered to/from the physical layer on common transport channels. Multiplexing/demultiplexing of upper layer PDUs into/from transport block sets delivered to/from the physical layer on dedicated transport channels. Traffic volume measurement. Transport Channel type switching. Ciphering. Access Service Class selection for RACH and CPCH transmission 6

7 Radio Link Control Protocol: RLC Services RLC Services to upper layer: Transparent data transfer. Notification of unrecoverable errors Maintenance of QoS as defined by upper layers Unacknowledged data transfer QoS setting Acknowledged data transfer. 7

8 Radio Link Control Protocol: RLC Functions RLC Functions Segmentation and reassembly Concatenation Padding Transfer of user data Error correction In-sequence delivery of upper layer PDUs Duplicate Detection Flow control Sequence number check Protocol error detection and recovery Ciphering RLC Functions Polling Status transmission SDU discard Estimated PDU Counter (EPC) mechanism Suspend/resume function Stop/continue function Re-establishment function 8

9 Air Interface Protocols RRC RRC RLC MAC WCDMA L1 UE WCDMA L1 WBTS FP Transport and transmission layers FP Transport and transmission layer DRNC RRC RLC MAC FP Transport and transmission layer SRNC Control Plane 9

10 Radio Resource Control Protocol: RRC functions Broadcast of information related to the non-access stratum (Core Network); Broadcast of information related to the access stratum; Establishment, maintenance and release of an RRC connection between the UE and UTRAN; Establishment, reconfiguration and release of Radio Bearers; Assignment, reconfiguration and release of radio resources for the RRC connection; RRC connection mobility functions; Control of requested QoS; UE measurement reporting and control of the reporting; Outer loop power control; Control of ciphering; Paging; Initial cell selection and cell re-selection; Arbitration of radio resources on uplink DCH; RRC message integrity protection; CBS control. 10

11 Air Interface Protocols RT NRT & RT RT NRT & RT PDCP RLC MAC WCDMA L1 UE WCDMA L1 WBTS FP Transport and transmission layers FP Transport and transmission layer DRNC RLC MAC FP SRNC PDCP Transport and transmission layer User Plane 11

12 Channels DS-WCDMA-FDD Downlink Uplink SCH BCCH PCH CCCH DCCH DTCH CCCH DTCH DCCH Logical Channels SCH BCH PCH FACH DCH RACH DCH CPCH Transport Channels SCH1/2 CCPCH-1 CCPCH-2 DPCH (DPDCH+DPCCH) PRACH PCPCHPhysical DPDCH DPCCH Channels DS-WCDMA-FDD network must inform = Direct the Sequencing, UE about the WCDMA radio environment, Frequency Division the information Duplex. Suitable consists for of codes, There All When In The the WCDMA, common DPCH FACH DCH Common SCH, user's second final dedicated are Uplink, DS-WCDMA-FDD there 2 layer BCCH Common (Dedicated traffic (Forward is level actions the direction, and Packet need a user network dedicated, and and is as in known traffic to that Control Access in the signaling Channel PCH Physical reach there GSM, must model, channels, for as Transport active Physical network are one the provide is information Channel) there mobile used user RACH Transport connection, is Common must CHannels, Channels known are source to service carries is station, (Random is carry the 3 perform is a layers. Channels. as divided multiplexed only information, Control the packet(s), carry the primary network dedicated Access The physical downlink in their Channel, all In the first and UE's combination some providing (when which respective sends Channel) uplink and pages channels. transport secondary. direction cases, Dedicated top-most the specified control direction cell the UE carries logical channel, of are These a UE common is is information transport the sent layer by able managed on Traffic between initial channels DPDCH primary RNC) are the through the to are resources Paging the Channel access start rest the from the through (dedicated channels carries the network logical are DPDCH the and may of the power The outdoor Network levels, use, Synchronisation neighboring will be the first information implementation and is etc.. carried The in 3G. information the In the Synchronisation Case for the of DS, UE data is Physical carried is spread Channel. in the over the user information common. the access. contain Common (Scnchronisation, system and Channel. channels, that cell Dedicated traffic) DPCCH Physical are information, are one The present and One which Control Traffic and used when logical physical Random dedicated Control DCH more the carry for Channel. required. Broadcast whereas DPCCH the channel, this logical channels. Access CHannel carries the RACH data. specific Channel. air-interface control purpose. the (dedicated containing and may information secondary channels. Paging carry of a signaling this one cell. Channels). per carries information channel. more channel).. other DTCH. is common called the control Sychronisation information. Channel. Broadcast the band as Control a function Channel. of time. 12

13 General Protocol Model Radio Network Layer Control Plane Application Protocol User Plane Data Stream(s) Transport Network Layer Transport Network User Plane Transport Network Control Plane Transport Network User Plane ALCAP(s) Signalling Bearer(s) Signalling Bearer(s) Data Bearer(s) Physical Transmission layer 13

14 Protocol Structure for Iub Radio Network Layer Control Plane NBAP DCH FP User Plane RACH FP FACH FP PCH FP DSCH FP CPCH FP Transport Network Layer Transport Network User Plane Transport Network Control Plane Q Transport Network User Plane SSCF-UNI SSCOP AAL5 Q SSCF-UNI SSCOP AAL5 AAL2 ATM 3G TS Physical Transmission layer 14

15 NBAP specific elementary procedures Function Cell Configuration Management Common Transport Channel Management System Information Management Resource Event Management Configuration Alignment Measurements on Common Resources Radio Link Management. Radio Link Supervision. Compressed Mode Control Measurements on Dedicated Resources DL Power Drifting Correction Reporting of General Error Situations Elementary Procedure(s) a) Cell Setup b) Cell Reconfiguration c) Cell Deletion a) Common Transport Channel Setup b) Common Transport Channel Reconfiguration c) Common Transport Channel Deletion System Information Update a) Block Resource b) Unblock Resource c) Resource Status Indication a) Audit Required b) Audit c) Reset a) Common Measurement Initiation b) Common Measurement Reporting c) Common Measurement Termination d) Common Measurement Failure Functions have same elementary procedures as RNSAP 15

16 Protocol Structure for Iur Radio Network Layer Control Plane RNSAP User Plane DCH FP CCH FP Transport Network Layer Transport Network User Plane Transport Network Control Plane Q Transport Network User Plane SCCP MTPb3 SSCF-NNI SSCOP AAL5 Q MTPb3 SSCF-NNI SSCOP AAL5 AAL2 ATM Physical Transmission layer 16

17 RNSAP Radio Network Subsystem Application Part RNSAP defines interactions between SRNC and DRNC over Iub interface RNSAP consists of Elementary Procedures (EP)'s, here Class 1 and Class 2 RANAP provide following services RNSAP Basic Mobility Procedures (Related to a specific UE) RNSAP DCH Procedures RNSAP Common Transport Channel Procedures RNSAP Global Procedures Support of parallel transactions RANAP services expected from Signalling Transport Connection oriented data transfer service Connectionless data transfer service RNSAP Function EP (class1) EP (class2) Request Message Success Failure 17

18 Protocol Structure for Iu-CS Radio Network Layer Control Plane RANAP User Plane Iu User Plane Protocol Transport Network Layer Transport Network User Plane Transport Network Control Plane Q Transport Network User Plane SCCP MTP3 SSCF-NNI SSCOP AAL5 Q MTP3 SSCF-NNI SSCOP AAL5 AAL2 ATM Physical Transmission layer 18

19 RANAP Radio Access Network Application Part for Iu-CS RANAP defines interactions between RNS and CN RANAP consists of Elementary Procedures (EP) Class 1: EP's with response, success or failure Class 2: EP's without response Class 3: EP's with possibility of multiple responses RANAP provide following signalling services General control services Notification services Dedicated control services RANAP services expected from Signalling Transport Connection oriented data transfer service Connectionless data transfer service General RANAP functions Management of Iu resources, signalling and RAB's Transport of NAS signalling messages between UE and CN Controlling the security mode in the UTRAN (ciphering and integrity protection) Controlling and transferring location reporting Data volume reporting for unsuccessfully transmitted DL Data UE Management like paging, UE Common ID sending, controlling UE activity tracing 19

20 Protocol Structure for Iu-PS Radio Network Layer Control Plane RANAP User Plane Iu User Plane Protocol Transport Network Layer Transport Network User Plane Transport Network Control Plane Transport Network User Plane SCCP MTPb3 SSCF-NNI SSCOP AAL5 GTP-U UDP IP AAL5 ATM Physical Transmission layer 20

21 RANAP Radio Access Network Application Part for Iu-PS Radio Access Bearer (RAB) Management functions Radio Resource Management functions Iu link Management functions Iu User-plane (RNL) Management Mobility management functions Security functions Service and Network Access functions Iu Co-ordination functions Separation of each UE for mobile specific signalling management Relocating the SRNS to another RNS and changing the IU connection point for a UE (streamlining) Transfer of transparent non-access signalling 21

22 UMTS course Introduction UMTS principles Network Architecture WCDMA Basics General Protocols Model Radio Resource Management and ATM transmission UMTS Evolution HSDPA TDD All IP UMTS Project Network Architecture and Design Rollout System Acceptance Testing Network Performances Launch 22

23 Radio Resource Management Iub RRC Connection Request Handover Control Active state mobility control Active set information Admission Control RRC admission decision Default set of transport channel and RLC parameters (Directed RRC connection set-up) RB information BLER or BER target, SIR target Packet Scheduler Radio resource scheduling Resource information Resource Manager Code allocation Transport resource allocation info Load information Load Control Cell load status Load change information Power Control UL Outer Loop Power Control 23

24 Admission Control Admission Control SIR - Allowed Range Uu Interface Bandwidth Radio Access Bearers in Uu Interface 24

25 Hand Over Control Multipath Signal through Sector 1 Sector 1 f1 BS Sector 2 f1 BS BS Sector 3 f1 Multipath Signal through Sector 3 BS BTS Frequency f1 Frequency f1 RNC Softer HO Iur RNC WCDMA GSM900/1800 Soft HO Iub BS BS Iub Inter System HO BS BS Frequency f1 Frequency f1 Hard Intra Frequency HO Frequency f1 Frequency f2 Hard Inter Frequency HO 25

26 Resource Manager Primary Scrambling Code Channelisation Code Set (256 Codes) Secondary Scrambling Code #1 Channelisation Code Set (256 Codes) Secondary Scrambling Code #2 Channelisation Code Set (256 Codes) Primary Scrambling Code Channelisation Code Set (256 Codes) Secondary Scrambling Code #1 Channelisation Code Set (256 Codes) Secondary Scrambling Code #2 Channelisation Code Set (256 Codes) Secondary Scrambling Code #15 Channelisation Code Set (256 Codes) Secondary Scrambling Code #15 Channelisation Code Set (256 Codes) Code Sets x 16 Scrambling Codes = 8192 Codes numbered from available 26

27 4 Power Control BS RNC Open Loop Power Control (Initial Access) Closed Loop Power Control Outer Loop Power Control 27

28 Packet Scheduler packet service session packet call time reading time packet size packet arrival interval 28

29 Load Control Overload Load Target Overload Margin Estimated capacity for NRT traffic. Power Measured load caused by non-controllable load 29

30 ATM in Brief (1/6) ATM Cell Payload (48 bytes) Header (5 bytes) Bit number: GFC VPI VPI VCI VCI VCI PT CLP HEC He ad er (5 Byt es) GFC = Generic Flow CVPI = t Virtual l Path Identifier VCI = Virtual Channel Id PT = tifi Payload Type CLP = Cell Loss Priority HEC = Header Error Control Payload Data 48 Bytes 30

31 ATM in Brief (2/6) ATM Layer ATM Cell Virtual Channel (VC) Virtual Path (VP) Transmission path HEADER PAYLOAD ATM cell (53 bytes) HEADER 5 bytes PAYLOAD 48 bytes 31

32 ATM in Brief (3/6) AAL2 AAL2 header e.g., 3 different users String of AAL2 Packet Data Units String of AAL2 Packet Data Units ATM CELL HEADER ATM CELL HEADER ATM cell HEADER PAYLOAD AAL2 PACKET, 3-byte header, variable length payload (packet size up to 48 bytes or fixed 64 bytes) OFFSET FIELD, 1-byte (indicates where the next AAL2 PDU starts) ATM CELL, 5-byte header + 48-byte payload PADDING 32

33 ATM in Brief (4/6) AAL5 AAL5 header USER DATA = Variable length 1-65,535 bytes USER DATA = Variable length 1-65,535 bytes AAL5 Packet Data Unit AAL5 Packet Data Unit ATM cell 1 ATM cell ATM cell n PAYLOAD = N x 48 BYTES AAL5 PACKET, 5-byte header, variable length payload, 8-byte trailer PADDING FIELD, variable length to fill the 48-byte ATM cell ATM CELL, 5-byte header + 48-byte payload 33

34 ATM in Brief (5/6) ATM over E1 ATM cell Header Payload E1 frame TS1-15 TS0 TS16 TS E1 frame TS1-15 TS0 TS16 TS

35 ATM in Brief (6/6) ATM over SDH VP1 VP2 1 byte VP3 9 bytes 260 bytes VC-4 9 bytes Section Overhead P O H... VC-4 STM-1 (155,52 Mbps) can fit cells per frame -> cells per second. 35