Voice Over U M T S Evolution From W C D M A, H S P A To L T E

Song, Peng-Peng UTRAN system engineering Voice over UMTS evolution - from WCDMA, HSPA to LTE

Outlines ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

AMR Voice characteristics ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],23.85, 23.05, 19.85, 18.25, 15.85, 14.25, 12.85, 8.85, 6.6 AMR_WB multi rate (kbps) 12.2 (GSM-EFR), 10.2, 7.95, 7.4(IS-136), 6.7(PDC-EFR), 5..9, 5.15, 4.75, 1.8(SID) AMR_NB multi rate (kbps) A/D … …… voice samples compressed frame 20ms codec output voice frame RTP packet UDP packet VoIP packet UTRAN UMTS PS CN IMS application servers 40 bytes (AMR 12.2) Total voice payload on air interface 16 bits (CRC) 2 byte (RLC security) 4 byte (RTP/UDP/IP) 10 bit + padding (RTP-pre-header) protocol overhead with compressed header SID packet every 160ms during silence 15 bytes(5 bvtes + header) SID 50% voice activity factor 20 ms encoder frame length source rate 12.2kbps RTP AMR 12.2 codec Characterization Parameter

Voice over R99 DCH ,[object Object],DCH DTCH DTCH DTCH DCCH DCCH DCCH DCCH DCH DCH DCH 3.4 kb/s DPDCH Class A bits Transport channels Physical channels Class B bits Class C bits RRC,AM NAS_DT, High prio, AM Logical channels NAS_DT, Low prio, AM RRC,UM DPCCH TFCI Transport Block Add CRC Add tailer bits Channel coding 2 nd interleaving Class A bits Class B bits Class C bits TB AMR 12.2k payload (SRB 3.4kb/s) DCCH CRC CRC 81 60 103 148 81 12 103 60 148 16 93 8 103 8 60 8 164 8 303 333 136 516 294 324 128 548 Rate matching 294 324 128 548 1 st interleaving Segmentation 1a 1b 2a 2b 3a 3b 4a 4b 4c 4d 1a 2a 3a 4a 147 147 162 162 64 64 137 137 137 137 1b 2b 3b 4b radio frame i radio frame i+1 1 2 15 510 510 CCTrCH level Phy Channel level … 1 2 15 … 6 34 510 + 90 6 34 … … … 510 + 90 Trans. ch multiplexing DPCCH DPDCH Transport Block level 1/3 Conv coding

Voice over R99 DCH ,[object Object],[object Object],[object Object],6A/6B event NodeB RNC Measurement report MSC UE Tx power IuUP rate control process Transport Format Combination Control NBAP dedicated measurement process RB reconfig A complete solution accompanied by power control, dedicated measurement, adaptive rate control, soft handover while minimizing radio resource usage! cell load Transmitted code power

CS over HSPA ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],NodeB Serving Cell Rel-7 UE PS & CS Core Network RNC CS over HSPA PS calls SRNS relocation ?!

CS over HSPA ,[object Object],[object Object],[object Object],[object Object],[object Object],DCH E-DCH HS-DSCH WCDMA L1 Processing HSPA L1 Processing (HARQ proc) MAC-e scheduler MAC-hs scheduler MAC-d RLC TM IuUP Proc. CS Telephony Core Network MAC-es MAC-d RLC UM PDCP (SN) (cs counter) (TN) Iub FP Iub FP NodeB RNC UE IuCS ,[object Object],[object Object],[object Object],[object Object],A beginning for voice over “packetized” radio interface!

VoIP over LTE ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],shared channel

VoIP over LTE ,[object Object],[object Object],UE 1 resource block: 180 kHz = 12 subcarriers PDCCH PDSCH Packet-switched voice over “packetized” radio interface! VoIP packets via S1 interface Multiplexing per user scheduling RLC (Segmentation, ARQ) PDCP (Header Compression, Ciphering) HARQ OFDM Signal Generation coding data modulator resource mapping eNodeB Tx to RF module time frequency Reference symbol Control channel resource User A User B User C Idle resource for data

Performance – cell capacity in 5MHz ,[object Object],[object Object],x1 x2 x2.85 x3.78 Orthogonal uplink Intelligent scheduling antenna diversity Link adaptation

Performance – latency Control plane latency: User plane latency: “ single-node” RAN architecture; Optimized signaling procedures 50ms 250~350ms 400~550ms dormant->connected < 100ms ~460ms >500ms idle ->connected ~100ms 2~3s >5.5s voice call setup LTE_VoIP CS over HSPA R99 AMR C-Plane latency

Conclusion ,[object Object],[object Object],[object Object],[object Object],shared channel ,[object Object],[object Object],[object Object],dedicated channel

Backup - comparison of radio parameters IMS core MSC+MGW MSC+MGW CN dependency Rel-8 UE as defined in TS 36.306 Rel-7 UE that can report “support for CS voice over HSPA” in “UE Radio Capability” IE N/A UE dependency available control channel resource(PUCCH/PDCCH bandwidth) UL interference-limited UL interference-limited, DL OVSF code limited potential capacity limitation UM UM TM RLC mode Yes(RFC3095) No No Header compression No No Y DL No Y Y UL support SHO or not N/A Y Y DL N/A Y Y UL rate adjustable by UTRAN 2x2/4x2 MIMO N/A N/A DL MU-MIMO, No Tx diversity N/A N/A UL Antenna diversity dynamic or semi-persistent scheduling Enhanced PF scheduling N/A DL semi-persistent scheduling Non-scheduled mode, rate controlled by RNC N/A UL NodeB scheduling Y in case of multi-RAB N/A DL Y N/A N/A UL link adaptation(AMC) Y Y N/A DL Y Y N/A UL HARQ 1/3 Turbo(QPP interleaver) 1/3 Turbo 1/3 Conv. DL 1/3 Turbo(QPP interleaver) 1/3 Turbo 1/3 Conv. UL channel coding 1ms 2ms 10ms DL 1ms 2ms or 10ms 10ms UL radio frame PDSCH(shared PHY channel) HS-DSCH(shared PHY channel) DCH DL PUSCH(shared PHY channel) E-DCH DCH UL radio channel LTE_VoIP CS over HSPA R99 voice

Voice Over U M T S Evolution From W C D M A, H S P A To L T E

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