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Evolution Of HSPA

A comprehensive view of HSPA evolution in 3GPP Rel-7

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Evolution Of HSPA

  1. 1. Evolution of HSPA - a tutorial to Rel-7 HSPA+ RAN System Engineer
  2. 2. Contents HSPA review - What we have now HSPA+ features: - MIMO: 2x2 DTxAA - High-Order-Modulation(HOM): 64QAM DL&16QAM UL - CPC: HS-SCCH Less Operation, DTX/DRX - Layer2 enhancement: Flexible PDU size - Enhanced CELL_FACH: HS-DSCH reception in CELL_FACH - F-DPCH enhancement Special features on HSPA: - VoIP over HSPA - CS voice over HSPA Advanced Receivers - Type 1: receive diversity mode - Type 2: LMMSE (Linear Minimum Mean Square Error) chip level Equalizer - Type 3: LMMSE + receive diversity 3GPP TR 25.999(v710) “HSPA evolution” 3GPP TS 25.101 “ UE radio transmission and reception” All rights reserved @ 2008
  3. 3. HSPA review: is it adequate as “packetized” radio interface? HSDPA RNC Downlink max 14.4Mpbs Associated DCH: MAC-hs: - F-DPCH in DL - Scheduling - DPCH in UL - HARQ Tx - Link adaptation HS HS -DSCH HS -SC -DP CH NodeB NodeB CC H Non-serving cell Serving cell UE in SHO (for associated DCH) HSUPA MAC-e: RTWP budget Scheduling MAC-e: HARQ Rx RNC HARQ Rx MAC-es: re-ordering nt Unused E-R Gra G ve CH lati NAK t : Ov Re K/ n E-DCH users er lo C H: A C G ra it ] E-H ad RG ICH: olute ppyB ICH ind E- Inter-cell interference Uplink max 5.76Mpbs DP :A ic a E-H : Abs Ha CC CK tor CH RI, H: /NA G E- TF Intra-cell DCH users pilo E-D t K E-A RSN, NodeB C H bit s CH :[ bit s Thermal Noise PC CH lot NodeB : pi UE in SHO E-D DPD CCH E- DP MAC-e multiplex Update Serving Grant E-TFC selection; All rights reserved @ 2008 HARQ Tx
  4. 4. Effective high data rates beyond HSPA: theoretical hints requires better signal strength rather than wider bandwidth! ⎛ S⎞ C = W log 2 ⎜1 + ⎟ ⎝ N⎠ Bandwidth expansion more beneficial than Eb/No rise! To get effective high data rate in WCDMA systems, we may want: Reasonable bandwidth Spatial multiplexing Reduced cell size High-order modulation Tx/Rx diversity Interference suppression All rights reserved @ 2008
  5. 5. The super highway leading forward - MIMO MIMO (Spatial multiplexing) - Each antenna used for transmitting a different stream. No antenna diversity in that case per stream MIMO in practice: spatial multiplexing + diversity - cross path between antennas exists and Diversity still needed for reliable transmittion - MIMO used both for spatial multiplexing (rate improvement) and diversity (SNR improvement) All rights reserved @ 2008
  6. 6. MIMO - capacity in Rayleigh propagation Transformation of MIMO channel into n SISO channels: MIMO capacity: ⎡ ρ ⎤ C = log 2 ⎢det( I + ⋅ H ⋅ H H )⎥ - channel known to Rx, unknown to Tx: ⎣ nt ⎦ - Maximized when Tx number = Rx number via orthogonal channels : ⎡ ρ ⎤ C = log 2 ⎢det( I + ⋅ n ⋅ I n )⎥ ⇒ C = n ⋅ log 2 (1 + ρ ) ⎣ n ⎦ Hints: • Capacity does not depend on the nature of the channel matrix as it increases linearly with n for a fixed SNR. • Every 3dB increase of SNR corresponds to an n bits/s/Hz increase in capacity All rights reserved @ 2008
  7. 7. MIMO in Practice –2x2 manner Ideally, we want: In practice, we use SVD decomposition to ease “H inversion”. H=U⋅D⋅VH Where U , V is unitaries of dimension nr × nr and nt × nt ; D is a non-negative diagonal matrix of nr × nt r r r Applying V at Tx side and U H at Rx side, we get U H ⋅ r = L = D ⋅ s + n ′ r r S γ Pre-coding: S1 r1 - to “orthogonalize” the H Signal parallel transmitted signals V UH processing S2 r2 All rights reserved @ 2008
  8. 8. MIMO in UTRAN – DTxAA • DTxAA – Double Transmission Antenna Array, 2x2 MIMO – Possible independent coding/modulation for each data stream – Successive interference cancellation at receiver – Peak rate at 28.8Mbps • Backward-compatible: – Pilot design: one CPICH using different pilot pattern as in Tx diversity per cell. – Control channels: based on HS-SCCH / HS-DPCCH. – Pre-coding based spatial multiplex: • weight factors complying to the R99 Tx diversity alphabet. • Deployment preference: – micro- or indoor- cells where NLOS(non light-of-sight) rays or wonderful multi- path exists All rights reserved @ 2008
  9. 9. MIMO in UTRAN – leveraging existing HSDPA channels - Two independent data streams (i,e. two TBs within one TTI); MAC-hs: - Scheduling - HARQ Tx - Rate adaptation HS -DS CH HS -SC HS CH -D P NodeB CC H Associated DCH: - F-DPCH in DL - DPCH in UL UE 3GPP TS 25.999(v100) All rights reserved @ 2008
  10. 10. DTxAA - Dual stream processing in baseband baseband processing Interleaving modulation HARQ rate matching channelization codes spreading SF=16 stream1 stream2 CRC attach. Turbo coding χ1 χ2 TrBlk1 TrBlk2 scrambing Pre-coding MAC-hs ⎛ y1 ⎞ ⎛ ω1 ω3 ⎞ ⎛ x1 ⎞ HARQ entity ω2 ⎜ ⎟=⎜ ⎜ y2 ⎟ ⎜ω ω ⎟ ∗ ⎜ x ⎟ ⎟ ⎜ ⎟ ω1 ω4 ⎝ ⎠ ⎝ 2 4⎠ ⎝ 2⎠ ω3 MAC-d flows through Iub Priority handling Scheduling y1 y2 to antenna 1 to antenna 2 All rights reserved @ 2008
  11. 11. MIMO in UTRAN – leveraging existing HSDPA channels - Two independent data streams (i,e. two TBs within one TTI); MAC-hs: Part 1 Part 2 - Scheduling - HARQ Tx - Link adaptation HS -Channelization codes - UE ID -DS CH - Modulation schemes - Transport block size HS -SC - Number of streams - Hybrid ARQ information HS CH - Precoding matrix - Transport block size, stream 2 -D P NodeB CC - Hybrid ARQ information, stream 2 H Jointly encoded HARQ- ACKs for dual-stream Associated DCH: (Hamming distance = 6) - F-DPCH in DL - DPCH in UL Tpyp A: contains CQIs for dual stream, UE 8 bits(0 ~ 255). Type B: in case of single stream, 5 bits(0 ~ 30) 2 ms Subframe Tslot = 2560 chips 2xTslot = 5120 chips HARQ-ACK CQI PCI A A A B A A A B …… A A B One HS-DPCCH subframe (2 ms) w3 = w1 = 1 / 2 w4 = − w2 Subframe #0 Subframe #i Subframe #4 One radio frame T = 10 ms 3GPP TS 25.999(v100) 3GPP TS 25.214 section 6A.2 All rights reserved @ 2008
  12. 12. MIMO in UTRAN --- Procedures •UE identifies multiple transmitting antennas according to different modulation patterns of P-CPICH Part 1 Part 2 •UE reports composite CQI and PCI (Pre- •Channelization codes •UE ID coding Control Indication) to NodeB •Modulation schemes •Transport block size •Number of streams •HARQ information •Pre-coding matrix •Transport block size, stream 2 •NodeB scheduler decides to transmit one HS-SCCH •HARQ information, stream 2 or two transport blocks in one TTI. HS-DS C H stre am2 •In case of two streams in transmission, HS-DS CH stream 1 NodeB explicitly notify UE about the MIMO Parameters (e.g number of streams, pre- coding matrix, transport block size and HS-DPCCH HARQ information) ACK/NACK Composite CQI/PCI 3GPP TS 25.214 Annex A 3GPP TS 25.214 section 9 All rights reserved @ 2008
  13. 13. MIMO in UTRAN - Performance • Assuming 80% cell power to HS channels, 20% to CCHs, UEs with Rx diversity • Ior/Ioc = 10dB: a break point for higher throughput for 64QAM and dual-stream MIMO • Single stream mode of MIMO provides at least 20% gain across whole cell! Cell sustained throughput MIMO 64QAM Rel-6 50% 20% 10.8 Mbps 20% 6 Mbps 20% Source: “3G HSDPA evolution: MIMO and 64QAM Performance in Macro Cellular Deployments”, Wireless Conference, 2008. EW 2008. 14th European “High Speed Packet Access Evolution – Concept and Technologies”, J.Peisa,S,, IEEE 2007. All rights reserved @ 2008
  14. 14. Higher Order Modulation – 64QAM(Downlink) • In case of good channel condition but propagation channels between antennas are high correlative, e.g LOS path exists • new HS-DSCH slot format introduced • Peak data rate(64QAM) = 15 codes * 2880 bits/2ms = 21.6Mbps • New UE category needed 3GPP TS 25.213(v740) Table 3c All rights reserved @ 2008
  15. 15. 64QAM – UE dependencies 3GPP TS 25.306 Table5.1a All rights reserved @ 2008
  16. 16. Higher Order Modulation – 16QAM(uplink) • On E-DCH with peak rate at 11.5Mbps • More power efficient for rates higher than 4Mbps • Mandatory for rates higher than 5.7Mbps • Will demand Interference Cancellation(IC) receiver at NodeB • Will demand uplink PDU size modification, e.g. 336 bits -> 656 bits • New UE Catogory 7 needed 11.5Mbps All rights reserved @ 2008
  17. 17. The protocol basis for high data rates - Layer 2 Enhancements RLC sliding window • Motivation: 0 n UTRAN Mobile – Rel-7 physical layer provides peak rate up to 28.8Mbps in DL (with MIMO) and 11.5Mbps in UL( with 16QAM). SN=0, P=0 – However, Rel-6 has semi-static RLC PDU size: SN=1, • with RLC window size 2048, RLC PDU size=40 bytes and P=0 RTT=100ms, the max data rate achievable is about Round Trip Time 2048*40*8/0.1=6.5Mbps(13.1Mbps for an 80 byte PDU) SN=n, • Goal: P=1 – is to prevent RLC PDU format from being the SN= n STATUS, bottleneck of high data rate transmission. • Flexible RLC PDU size: – Packet-Centric RLC Concept as LTE RLC D/C Sequence Number Oct1 – Being able to map packets one-to-one to RLC Sequence Number P HE Oct2 PDUs Length Indicator E Oct3 (Optional) (1) – Use Header Extension(HE) to indicate that last . . byte of SDU is the last byte of the PDU . Length Indicator E RLC SDU 1 RLC SDU 1 RLC SDU 2 Data RLC hdr payload RLC hdr payload Header Extention in use Length Indicator in use PAD or a piggybacked STATUS PDU OctN 3GPP TS 25.322(v750) section All rights reserved @ 2008
  18. 18. Layer 2 Enhancements – MAC • MAC-ehs: – MAC will segment RLC PDUs to adapt to momentary raido channels • Segmentation indicator introduced in header – Allow multiplex of data from multiple priority queues within one TTI • Header supports indication of multiple logical channel identities • C/T header is removed – MAC-hs header is Octet-aligned – New MAC-hs PDU format introduced: LCH id 1 L1 TSN 1 SI 1 F1 LCH id k Lk TSN k SI k Fk LCH Id – 4 bits: logical channel id L – 11 bits: length indicator TSN – 6 bits: One TSN per reordering queue SI – 2bits: segmentation indicator F – 1 bit: flag indication MAC-ehs Header Reordering PDU Reordering PDU Padding • MAC-ehs or MAC-hs is subject to configuration by network 3GPP TS 25.321 section All rights reserved @ 2008
  19. 19. Enhanced L2– example of MAC data multiplexing Logical Channel 1 Logical Channel 2 Logical Channel 3 Logical Channel 4 MAC-d Flow 1 MAC-d Flow 2 MAC-d Flow 3 MAC-d Flow 4 Queue 1 Queue 2 LCH Id1 L1 TSN SI F LCH Id1 L2 F LCH Id2 L3 F LCH Id4 L4 TSN SI F All rights reserved @ 2008
  20. 20. Enhanced Layer 2 – a case of IP packet Assuming an IP packet at size of 1500 bytes Rel-5: with fixed RLC PDU size at 40 bytes Rel-7: flexible RLC PDU size IP packet (1500 bytes) IP packet (1500 bytes) 2 bytes 2 bytes L2 PDCP : PDCP hdr IP packet (1500 bytes) PDCP hdr IP packet (1500 bytes) 40 bytes 22 bytes RLC Segmentation: #1 #2 #37 #38 padding L2 RLC: RLC hdr RLC hdr RLC hdr L RLC hdr Payload (1502 bytes) 42 bytes 42 bytes 42 bytes 1504 bytes L2 MAC-d: MAC-d PDU(1504 bytes) 42 bytes 42 bytes 21 bits 24 bits MAC-ehs hdr Payload(1504 bytes) L2 MAC-hs : MAC-hs hdr Payload(42*38=1596 bytes) Appropriate TrBlk 12810 bits 12056 bits for HS-DSCH: 12943 bits 12056 bits In total 7% L2 overhead (922 bits) for In total 0.3% L2 overhead (56 bits) for IP packet transmission! IP packet transmission! All rights reserved @ 2008
  21. 21. Is it efficient on the highway for small cargos? ? • Continuous Packet Connectivity (CPC) – to keep UEs in CELL_DCH for a longer time & avoid frequent state transition • Scope: 1. DTX: to reduce UL intra-cell interference and save UE battery life 2. DRX: battery savings by discontinuous reception of HS-SCCH and E- AGCH/E-RGCH. Note: F-DPCH will be in use and SRB is over HSPA. 3. HS-SCCH less operation: optimized design for small packets or low bit rates (especially for VoIP or streaming) with bounded over-the-air latency – HS-SCCH signaling overhead is not insignificant comparing to VoIP packets on HS-DSCH – Principle is to permit HS-DSCH transmissions without any companying HS-SCCH, i,e. using a set of pre-defined formats (on HS-DSCH) aided by UE blind decoding 3GPP TR 25.903 “Continuous connectivity for packet data users(Rel-7) “ All rights reserved @ 2008
  22. 22. CPC: HS-SCCH less operation Initial transmission: No HS-SCCHs! •No HS-SCCHs HS -D SCH •QPSK and Xrv=0 •Pre-defined transport format and channelization codes ACK •UE_ID indicated by CRC bits on HS-DSCH HS-SCC H type 2 2nd transmission: HS -D SCH •HS-SCCH type 2 defined in this case •QPSK and Xrv=3 ACK /NAC K HS-SC 3rd transmission: CH t y pe 2 •HS-SCCH type 2 in use HS -D SCH •QPSK and Xrv=4 ACK /NAC K 3GPP TS 25.212(v770) section 4.6A All rights reserved @ 2008
  23. 23. CPC: HS-SCCH less operation HS-SCCH type 2 Initial transmission: No HS-SCCHs! •Channelization code set information (7 bits) •No HS-SCCHs •Modulation scheme informationH 1 bit) HS -D SC ( •QPSK and Xrv=0 information (2 bits); • Transport-block size •Special information type( 6 bits = “ 111110”) • Pointer to the previous transmission (3 bits); •Pre-defined transport format and channelization • Second or third transmission (1 bit); •Special information (7 bits) codes • Reserved (1 bit); •UE ID (16 bits) ACK •UE_ID indicated by CRC bits on HS-DSCH HS-SCC H type 2 2nd transmission: HS -D SCH •HS-SCCH type 2 defined in this case •QPSK and Xrv=3 ACK /NAC K HS-SC 3rd transmission: CH t y pe 2 •HS-SCCH type 2 in use HS -D SCH •QPSK and Xrv=4 ACK /NAC K 3GPP TS 25.212(v770) section 4.6A All rights reserved @ 2008
  24. 24. CPC - DTX • Goal: – to reduce the uplink control channel overhead for DPCCH. • Principle: – use occasional slots of DPCCH activity (i,e. uplink DPCCH gating) to maintain uplink synchronization and reasonable power control, in case of no data transmission. – Controlled by either RRC signaling or physical layer L1 command – No impact on ACK/NACK transmission on HS-DPCCH; CQI report follows DTX pattern unless recent HS-DSCH reception occurred. depends on E- applied when no DCH inactivity uplink data transmission 3GPP TS 25.214(v770) section 6C All rights reserved @ 2008
  25. 25. CPC - DRX • Goal: – to reduce UE battery power consumption in active state • Principle: – Following certain period of HS-DSCH inactivity, UE is restricted to monitor HS-SCCH,E-AGCH and E-RGCH in specified subframes. – Always used together with DTX – Reception of E-HICH and F-DPCH is not affected by DRX operation. – Controlled by either RRC signaling or physical layer L1 command. DTX_cycle and DRX_cycle should match each other! All rights reserved @ 2008
  26. 26. CPC: DTX/DRX activation • Enabling delay: – a configurable time to allow synchronization and power control loops to stabilize when to activate DTX/DRX by RRC signalings • HS-SCCH Order (L1 command): – Reserved HS-SCCH bit patterns to switch on-off DTX/DRX by NodeB • New DPCCH slot format: – Contains only Pilot bits and TPC bits, for reduction of UL DPCCH Tx power. 3GPP TS 25.212(v770) section 6C.4 All rights reserved @ 2008
  27. 27. CPC: Performance PB3 VoIP CAPACITY 0.30 Original HS-SCCH-less: 2 TB sizes 0.25 Original HS-SCCH-less: 4 TB sizes HS-SCCH Less operation Reduced complexity HS-SCCH-less: 4 TB sizes provides near 17% VoIP capacity Rel 5 HSDPA: Legacy gain at 5% system outage rate OUTAGE PROBABILITY 0.20 0.15 0.10 0.05 DTX contributes to VoIP capacity gain 0.00 40 50 60 70 80 90 100 significantly! VoIP USERS Source: 3GPP TR 25.903 “Continuous connectivity for packet data users(Rel-7) “ All rights reserved @ 2008
  28. 28. What is use of a highway if it takes too long to reach it? • Enhanced CELL_FACH operation: – Reduce state transition latency from Non CELL_DCH states to CELL_DCH states – Faster data transmission for bursty, small packet applications, e.g Presense – Lower UE power consumption in CELL_FACH state by discontinuous reception • HS-DSCH reception in CELL_FACH – Not intended to keep an active UE in CELL_FACH for a long time, but to prepare for quick moving to CELL_DCH while minimizing the interruption for data transmission during state transitions. • HS-DSCH reception in CELL_PCH/URA_PCH – No plan to support this! 3GPP TS 25.308(v790) section 14 All rights reserved @ 2008
  29. 29. Enhanced CELL_FACH Operation • HS-DSCH reception in CELL_FACH – Enabled by including “HS-DSCH common system information “ in system information MAC-ehs and broadcast SIB 5/5 bis flexible PDU size in use! – Overwhelms S-CCPCH reception, CCH power Common No DCHs for saved for HSPA channels H-RNTI receiving data! t cas – UE, w.r.t Common H-RNTI, monitors HS-SCCH r oad nb for HS-DSCH reception atio PCH rm C – BCCH mapped to HS-DSCH: “System info S-C CC H st em S-S Information Change” message can now be Sy H H SC conveyed in HS-DSCH for specific H-RNTIs. H S-D NodeB – UE category 1~4 and 11 do not support this CH RA • Interacting with existing HSDPA Rel-7 UE rules: – No dedicated uplink channel, e.g HS-DPCCH – HARQ replaced by quick blind repetition on MAC With MAC-ehs in use, received data PDUs format in CELL_FACH will – Link adaptation based on measurement reports be same as that of CELL_DCH, via RACH to RNC which forwards it to NodeB to thereby no interruptions between determine MCS and transmit power state transitions. All rights reserved @ 2008
  30. 30. HSPA+: typical use in a web-browsing applications High throughput in Very quick All rights reserved @ 2008 Current Drain DNLK direction transition to transmit again 100-150ms (*) 10-15s (*) CELL_DCH CELL_FACH CELL_PCH CELL_DCH
  31. 31. VoIP over HSPA • What : - VoIP application in IMS domain, already standardized in 3GPP R5. • How : - Rel-5 standard provides “PS conversational RAB at 42.8kbps” without head compression - With RoHC(headers compressed to 7 bytes), PS conversational RAB at 15.6 kbps can convey VoIP packets reliably. - SRB over HSPA needed, thus F-DPCH required - enhanced NodeB scheduler for VoIP service - HS-SCCH less operation is preferred • Benefit : - reduced cost-per-bit - with CPC, RAN can support doubled user capacity per cell against R99 voice users. DCH DCH DCH HS-DSCH All rights reserved @ 2008
  32. 32. VoIP over HSPA • What : - VoIP application in IMS domain, already standardized in 3GPP R5. • How : - Rel-5 standard provides “PS conversational RAB at 42.8kbps” without head compression - With RoHC(headers compressed to 7 bytes), PS conversational RAB at 15.6 kbps can convey VoIP packets reliably. - SRB over HSPA needed, thus F-DPCH required - enhanced NodeB scheduler for VoIP service - HS-SCCH less operation is preferred • Benefit : - reduced cost-per-bit - with CPC, RAN can support doubled user capacity per cell against R99 voice users Radio Bearer established on HS-DSCH/E- DCH All rights reserved @ 2008
  33. 33. CS voice over HSPA Motivation: - an early implementation of R8 feature in R7 - can avoid surplus SRNS relocation signaling in collapsed UTRAN architecture Benefit: - no needs of IMS core network for voice packet over HSPA - Capacity gain: • 23% capacity gain( with 2ms HSUPA TTI) over R99 voice user numbers per cell; • with CPC, will have 48% capacity gains over R99. - better talk time with CPC Dependency: - Demand Rel-7 UE with enabled “UE radio capability parameters” WCDMA L1 MAC-d RLC IuUP CS Telephony DCH Iub FP Processing TM Proc. IuCS Core Network MAC-e MAC-es E-DCH scheduler Iub FP HSPA L1 MAC-d RLC PDCP UE Processing UM (cs HS-DSCH MAC-hs (TN) (HARQ proc) scheduler (SN) counter) NodeB RNC All rights reserved @ 2008
  34. 34. HSPA evolution: benefits Doubled Data Capacity over HSPA 2X higher peak rates Up to 3X Voice Capacity over R99 H Voice over HSPA leverages HSPA features S Similar Performance as LTE P With same Antenna numbers and bandwidth A Improved User Experience + Better always-on experience, lower latency, faster call setup Backward Compatible and Natural Evolution Incremental and cost-effective upgrade 3GPP TS 25.913(v800) “Requirements for Evolved UTRA (E-UTRA) and Evolved UTRAN (E-UTRAN)” All rights reserved @ 2008
  35. 35. Q&A All rights reserved @ 2008
  36. 36. Backup: conventional HSDPA Layer 1 processing Scheduling Priority Handling (per cell) HARQ entity (per user) MAC-hs Virtual IR Second RM stage buffer CRC attachment First RM stage Nt,sys Systematic Nsys RM_S bits bit scrambling Rate Nt,p1 Parity 1 Np1 1/3 RM_P1_1 RM_P1_2 Turbo coding Turbo coding Parity 2 Np2 Nt,p2 RM_P2_1 RM_P2_2 HARQ rate matching r s Physical channel segmentation Interleaving Constellation rearrangement All rights reserved @ 2008
  37. 37. Backup: pre- and post- amble detection ACK: 1111111111 NACK: 0000000000 PREAMBLE (”PRE”): 0010010010 POSTAMBLE (”POST”): 0100100100 All rights reserved @ 2008
  38. 38. Backup: F-DPCH channel format Any CPICH 10 ms 10 ms P-CCPCH Radio framewith (SFN modulo 2) = 0 Radio framewith (SFN modulo 2) = 1 UE 1 DPCH τ DPCH1 UE 2 DPCH τ DPCH2 TPC bits for 1 slot τ DPCH3 UE 3 DPCH Shared PC channel HS-PDSCH Subframe Subframe Subframe Subframe Subframe Subframe Subframe Subframe Subframes #0 #1 #2 #3 #4 #5 #6 #7 Ttx_diff 0 2 6 9 512 chips TPC (Tx OFF) (Tx OFF) NTPC bits Tslot = 2560 chips Slot #0 Slot #1 Slot #i Slot #14 1 radio frame: Tf = 10 ms All rights reserved @ 2008
  39. 39. Review of Tx diversity: Alamouti code • Assume channel constant across two symbols All rights reserved @ 2008
  40. 40. Backup: coding for HS-DPCCH: CQI/PCI • Composite PCI and CQI: concatenated and coded into 20 bits using a block code. • PCI(2 bits): indicates the pre-coding matrices for the UE. • CQI – Type A(8 bits): recommend number of streams and CQIs Type A Type B – Type B(5 bits): for single data stream transmission CQI PCI OR CQI Binary mapping Binary mapping pci 0,pci 1 cqi 0,cqi 1, …cqi 7 cqi 0,cqi 1, …cqi4 concatenation 3GPP TS 25.214 section 6A.2 a0,a1...a9 OR a0,a1...a6 All rights reserved @ 2008
  41. 41. Backup: coding for HS-DPCCH: HARQ-ACK Rel - 7 Rel - 5 3GPP TS 25.212 section 4.7.3 All rights reserved @ 2008
  42. 42. Backup: HS-SCCH Control information Part 1 Part 2 3GPP TS 25.212(v770) section 4.6 All rights reserved @ 2008
  43. 43. Backup: parameters on DTX/DRX All rights reserved @ 2008
  44. 44. Backup: MAC-ehs segmentation Queue 1 Queue 2 RLC PDU1 LCH 0 RLC PDU 2 RLC PDU3 RLC PDU1 LCH 1 RLC PDU2 RLC PDU1 LCH 2 N SI TS LCH Id0 L1 0 00 0 LCH Id0 L1 0 LCH Id0 L2 1 N SI TS LCH Id1 L1 1 10 0 LCH Id1 L2 1 N SI N SI TS TS LCH Id1 L1 2 01 0 LCH Id2 L2 0 LCH Id4 L1 0 10 0 LCH Id4 L1 0 LCH Id4 L2 1 Complete PDU Segmented PDU All rights reserved @ 2008
  45. 45. Backup: HSPA+ usage in VoIP session All rights reserved @ 2008 Constant end- Network Current Drain Handover to-end delay capacity P P 160ms P P P P P P P P

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A comprehensive view of HSPA evolution in 3GPP Rel-7


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