Concepts of HSUPA. Agilent Technologies. Concepts of HSUPA

Transcription

1 Agilent Technologies

2 Agenda What is HSUPA? Layer 1 Overview UE and Network HSUPA Additions: Layer 2 and 3 Overview HSUPA Throughput Page 2

3 What is HSUPA? Why important? Three terms for the same thing: HSUPA = High Speed Uplink Packet Access (market standard) E-DCH = Enhanced Dedicated Channel (3GPP standards documents) EUL = Enhanced Uplink HSPA = HSDPA + HSUPA Although can be used separately, will be used together for many applications such as VOIP or mobile gaming Purpose of HSUPA is to: Increase UL throughput (data rates) Increase network capacity Reduce delays to improve performance of applications (like mobile gaming, 2-way VOIP) Page 3

4 HSUPA Timing Predictions HSUPA First Networks HSUPA Many Networks HSUPA Initial Mfg. (2-3 PC cards) HSUPA Initial Mfg. (first UEs) HSUPA Initial Mfg. (many UEs) DO Rel A Initial Mfg. DO Rel B Initial Mfg. HSUPA Volume Mfg. (2-3 PC cards) HSUPA Volume Mfg. (first UEs) Page 4

5 HSUPA Downlink and Uplink Channels: Layer 1 Overview Channel Mapping Downlink Channels Uplink Channels L3 RRC L2 MAC L1

6 Uplink Downlink HSUPA Overview Key features and changes Allows uplink packet data to 5.74Mbps 384 kbps is current practical limit with Rel 99 Hybrid ARQ similar to HSDPA, except UE sends, node B ACKs/NACKs Node B provides fast scheduling, dynamically allocating power among UEs New optional 2ms TTI (transmission time interval) 10 ms TTI allows only 2 Mbps UL 5 new physical channels 2 UL, 3 DL 1 new UL transport channel Not a shared data channel as in HSDPA Architecture MAC IP / TCP / etc. PDCP RLC MAC-d MAC-es MAC-e L1 E-DCH E-AGCH E-RGCH E-HICH E-DPDCH E-DPDCH E-DPCCH Absolute & Relative grants Ack/Nack Data Control Page 6 HSUPA 8960 Call Processing Agilent Confidential May 17, 2006 Page 6

7 Uplink Physical Channels Physical channels: (Enhanced Dedicated Physical Data Channel) (Enhanced Dedicated Physical Control Channel) transport Channels are IQ multiplexed E-DPCCH on I E-DPDCH mapping varies E-DPCCH (carries control info to allow decode E-DPDCH physical E-TFCI, RSN (Retransmission Sequence Number) and Happy Bit E-DPDCH (carries user data) Variable SF and quantity - 1*SF256 up to 2*SF2 + 2*SF4 Page 7

8 E-DPCCH/E-DPDCH frame and subframe structures E-DPDCH Data, N data bits T slot = 2560 chips, N data = 10*2 k bits (k=0 7) E-DPCCH 10 bits T slot = 2560 chips Slot #0 Slot #1 Slot #2 Slot #i Slot #14 1 subframe = 2 ms 1 radio frame, T f = 10 ms E-DPCCH/E-DPDCH frame and subframe structures From Figure 2B, 3GPP TS v Page 8

9 Downlink Physical Channels E-HICH (Enhanced HARQ Indicator Channel) Transmits ACKs/NACKs: Node B to UE similar to HSDPA UL HS-DPCCH, except no CQI Response occurs a fixed time after E- DPDCH transmission Shares same code as E-RGCH E-AGCH (Enhanced Absolute Grant Channel) Provides absolute limit of max resources UE can use max E-DPDCH/DPCCH ratio Shared channel CRC masked by UE ID E-RGCH (Enhanced Relative Grant Channel) Moves Serving Grant up/down/hold Shares same code as E-HICH Page 9

10 Scheduling Grant Table Node B UE Absolute Grant Value Index (168/15) 2 x6 31 (150/15) 2 x6 30 (168/15) 2 x4 29 (150/15) 2 x4 28 (134/15) 2 x4 27 (119/15) 2 x4 26 (150/15) 2 x2 25 (95/15) 2 x4 24 (168/15) 2 23 (150/15) 2 22 (134/15) 2 21 (119/15) 2 20 (106/15) 2 19 (95/15) 2 18 (84/15) 2 17 (75/15) 2 16 (67/15) 2 15 (60/15) 2 14 (53/15) 2 13 (47/15) 2 12 (42/15) 2 11 (38/15) 2 10 (34/15) 2 9 (30/15) 2 8 (27/15) 2 7 (24/15) 2 6 (19/15) 2 5 (15/15) 2 4 (11/15) 2 3 (7/15) 2 2 ZERO_GRANT* 1 INACTIVE* 0 Serving Grant 1. Absolute Grant 2-step threshold 3-step threshold Index UE calculated Scheduled Grant 37 (168/15) 2 *6 36 (150/15) 2 *6 35 (168/15) 2 *4 34 (150/15) 2 *4 33 (134/15) 2 *4 32 (119/15) 2 *4 31 (150/15) 2 *2 30 (95/15) 2 *4 29 (168/15) 2 28 (150/15) 2 27 (134/15) 2 26 (119/15) 2 25 (106/15) 2 24 (95/15) 2 23 (84/15) 2 22 (75/15) 2 21 (67/15) 2 20 (60/15) 2 19 (53/15) 2 18 (47/15) 2 17 (42/15) 2 16 (38/15) 2 15 (34/15) 2 14 (30/15) 2 13 (27/15) 2 12 (24/15) 2 11 (21/15) 2 10 (19/15) 2 9 (17/15) 2 8 (15/15) 2 7 (13/15) 2 6 (12/15) 2 5 (11/15) 2 4 (9/15) 2 3 (8/15) 2 2 (7/15) 2 1 (6/15) 2 0 (5/15) 2 Not Available Available Page 10

11 Serving Grant UE Scheduling: Node B regulates how much data the UE can send UE maintains Serving Grant calculation - granted first by Absolute Grant, changed by Relative Grants Updated each TTI Serving Grant controls the max power the UE can use to transmit data on E-DPDCH(s) Determines max data rate E-TFC tables give power needed for rates UE chooses E-TFC each TTI (based on available data to send and available power it is capable of transmitting). It can choose less than the Serving Grant allows. UE Reporting: UE provides feedback to node B each TTI Happy Bit Node B resources Unhappy: UE cannot empty buffer in n ms, using all of Serving Grant, could TX at higher power otherwise Happy Page 11

12 HSUPA Additions: Layer 2 and 3 Overview Layer 2/3 Additions UE Additions Network Additions L3 RRC L2 MAC L1

13 MAC-es/e (network) MAC-es (RNC) Reordering queue Macro diversity selection MAC-es to MAC-d Reordering Combining to MAC-d Reordering Queue MAC-e (Node-B) Scheduler De-multiplexer HARQ processes MAC-e Scheduling /control MAC-d flow HARQ process De-multiplexer HARQ process MAC-d flow HARQ process E-R/AGCH E-HICH E-DCH Page 13

14 MAC-es/e (UE) from MAC-d from MAC-d Single sub-layer MAC-e/es E-TFC selection Multiplexing HARQ Processes E-TFC selection HARQ process Multiplexer HARQ process HARQ process E-R/AGCH E-HICH E-DCH Page 14

15 HARQ Operation Retransmissions in the UL are synchronous (i.e., a fixed time after the original transmission) 4 Processes for TTI = 10ms (gives 40ms turnaround time) 8 Processes for TTI = 2ms (gives 16ms turnaround time) Maximum limit on the number of times a block can be retransmitted TSN (Transmission Sequence Number) tracks which block of data is being sent RSN (Retransmission Sequence Number) to track redundancy Incremental redundancy or Chase Combining used by Node B to combine blocks Transmitter (UE) Receiver (Node B) Page 15

16 HSUPA Channels in Action Serving Cell RNC Packet Reordering Node B Serving E-DCH RLS Node B Non-serving E-DCH RLS The absolute grant channel is only sent by the serving cell. Relative Grants and ACK/NACKs from the same Radio Link Set (RLS) are the same will be soft combined by the UE. E-DCHs (carried on E-DPDCH) will be soft-combined at Node B. Non-Serving RLS Cells cannot increase data rate only hold or decrease it. Page 16

17 HSUPA vs HSDPA TS Table 5,1g Feature HSUPA HSDPA Max Data rate UL 5.76Mbps DL 14.4Mbps UE Category Category 1: 0.73Mbps (10ms TTI only) Category 1-6 : 3.6Mbps Category 2: 1.46MBps (10ms/2ms TTI) Category 7 : 7.2Mbps Category 3: 1.46Mbps (10ms TTI only) Category 8-9 : 10.1Mbps Category 4: 2Mbps (10ms TTI) Category 10: 14Mbps 2.9Mbps (2ms TTI) Category : 1.8Mbps Category 5: 2Mbps (10ms TTI only) Category 6: 2Mbps (10ms TTI) 5.76Mbps (2ms TTI) Physical channel E-HICH, E-AGCH, E-HICH (DL) E-DPDCH, E-DPCCH (UL) HS-PDSCH, HS-SCCH (DL) HS-DPCCH (UL) Multicode Max 4 E-DPDCH Max 15 HS-PDSCH Modulation BPSK (UL) QPSK, 16QAM (DL) Spreading Factor E-DPDCH (SF256, SF128, SF64, SF32, SF16, SF8, HS-PDSCH (SF16) HS-HSSH (SF128) SF4, 2 SF4, 2 SF2, 2 SF2+2 SF4) E-DPCCH (SF256 ) TTI 10ms, 2ms 2ms HARQ coding IR (Incremental Redundancy) IR (Incremental Redundancy) CC (Chase Combining) HARQ Process 10ms (4 process), 2ms (8 Process) Up to 8 process AMC No Yes 3GPP standard Release 6 Release 5 Page 17

18 HSUPA Summary Introduced in 3GPP Release-6 as E-DCH Uplink focused data rate increasing: up to 5.7Mbps (theoretically) New physical channels: Uplink: E-DPCCH, E-DPDCH with up to Spreading Factor 2 code channels Downlink: E-HICH, E-RGCH, E-AGCH Hybrid ARQ rapid retransmissions of erroneously received data packets between UE and Node B. Supports both 2 ms TTI and 10 ms TTI. Page 18