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Packet Data Capacity, UE power consumption, optimization proposals R2-A01-0008 January 15, 2001 Golden Bridge Technology

Technology and innovation. Packet Data Capacity, UE power consumption, optimization proposals R2-A01-0008 January 15, 2001 Golden Bridge Technology, USA. DCH/DCH: Circuit Mode of Operation. MS. BS. Call Request RACH. Call setup time 100-few hundred ms. Call accepted - CH assigned

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Packet Data Capacity, UE power consumption, optimization proposals R2-A01-0008 January 15, 2001 Golden Bridge Technology

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  1. Technology and innovation • Packet Data Capacity, UE power consumption, optimization proposals • R2-A01-0008 • January 15, 2001 • Golden Bridge Technology, USA

  2. DCH/DCH: Circuit Mode of Operation MS BS Call Request RACH Call setup time 100-few hundred ms Call accepted - CH assigned FACH Packet Data and Overhead Transfer DCH Inactivity Time, Tinact 1 - 3 sec Release Call release time 100- few hundred ms Channel -release

  3. USE OF DCH FOR UPLINK HURTS DOWNLINK CAPACITYDCH:CPCH Overhead ratio = 20 :1 DCH Uplink 60 msec Tinact (1 -3 sec) DCH Data 1 RACH DCH Control channel 1 DCH Uplink DCH Data 2 RACH DCH Control channel 2 DCH Downlink FACH DCH Control channel 1 FACH DCH Control channel 2 CPCH Data 1 CPCH Data 2 Uplink Downlink Downlink overhead Uplink overhead

  4. USE OF DSCH FOR DOWNLINK HURTS DOWNLINK CAPACITY DCH/DSCH Downlink DSCH Data 1 FACH assign DCH Control channel DSCH Data 2 FACH assign DCH Control channel CPCH/FACH Downlink FACH Data 1 FACH Data 2 DCH Control channel DCH Control channel Downlink Overhead

  5. 1 1 1 1 2 2 2 2 3 3 3 3 4 4 4 4 5 5 5 5 FACH/CPCH versus DSCH COMMON CHANNEL SOLUTION: 1 2 FACH Control Channel DEDICATED CHANNELS SOLUTION : 1 2 DSCH DCH1 1 Control Channel DCH2 2 Control Channel DCH3 3 Control Channel DCH4 4 Control Channel DCH5 5 Control Channel

  6. Capacity gain of CPCH/FACH over DCH/DCH+ DSCH or unidirectional downlink transfer

  7. Spectrum efficiency gain of CPCH/FACH over DCH/ DCH for unidirectional uplink transfer

  8. Throughput ImprovementRatioCPCH/FACH vs DCH/DCH+DSCH and DCH/DCH

  9. Applications Uplink Usage Uplink Packet size per user (Bytes) Downlink Usage Downlink Packet size per user (Bytes) n, m File sizes (kbytes) E-mail 80% 240 40% 240 2,3 7.2 Web-browsing 10% 80 50% 480 4,15 7.2(up) 1.35(down) FTP 10% 480 10% 480 7,127 61 CPCH/FACH versus DCH/DCH+DSCH and DCH/DCH: Capacity Gain in both directions Table 4: Traffic model.

  10. Capacity CPCH/FACH vs DCH/DCH+DSCH Uplink Direction: CPCH capacity = 26 xDCH Downlink Direction: FACH capacity = 3.5 x DSCH+DCH

  11. Resource Utilization Gain:CPCH/FACH vs DCH/DCH+DSCH UL Gain CPCH vs. DCH: Gain range of 1.2-34 DL Gain FACH versus DSCH+DCH: Gain range of 2-134 Typical example Overall CPCH/FACH gain over DCH/DCH+DSCH X 16

  12. Recommendations 1-2 • Fast de-allocation of DCH/DSCH+DCH or DCH/DCH • Improvement of the OLPC-FACH for 10-20-40-80 ms loads for SF as low as 4

  13. RACH/FACH versus CPCH/FACH Capacity Comparison

  14. Throughput delay performance of CPCH and RACH

  15. Recommendation 3 3. Introduction of CR on RACH to improve throughput, reduce collisions and reduce UE power consumption

  16. Mode of Operation Power Consumption Full Duplex 80 mA Idle (Rx+Buffer) 40 mA Sleep Mode 1.25 mA Table 1: ASIC Power Consumption

  17. Mode of Operation Power Consumption Full Duplex 56 mA (Rx) + 80 mA (minimum TX)+ 240 mA (TX PA) Idle 56 mA (Rx) Sleep Mode 2.5 mA Table 2: RF segment Power Consumption

  18. Terminal Type Power Consumption Cell Phone 150 A Smart Phone 600 A-1.2 mA PDA/Passive 1 mA-2 mA PDA/Active 13.3 mA Table 3: LCD Display Power Consumption

  19. A: Activity factor I average-circuit-DCH I LCD = 2 mA I average-packet-CPCH I LCD = 2 mA Gain Ratio I average-circuit-DCH I LCD = 13.3 mA I average-packett-CPCH I LCD = 13.3 mA Gain Ratio 1% 10.27 mA 6.27 mA 1.7 21.27 mA 17.26 mA 1.23 5% 28.3 mA 8.31 mA 3.4 39.4 mA 19.3 mA 2 10% 50.9 mA 10.9 mA 4.7 62 mA 22.25 mA 2.8 20% 99.2 mA 16 mA 6.2 107.2 mA 26.8 mA 4 25% 119 mA 18.55 mA 6.4 130 mA 29.55 mA 4.4 Terminal Power Consumption Ratio: Packet Mode vs. Circuit Mode

  20. Conclusions on Power Consumption • Gain Ratio of 2-6.4 (1-25% activity factor) • Gain Ratio of 4-6 (A=20% and 2-13 mA LCD display)

  21. Recommendation 4-5 4. Use of DCH/DCH in uplink bursty packet data transfer leads to excessive interference and UE power consumption. Since fast de-allocation is not practical, avoid using DCH/DCH for this purpose. 5. Use of dedicated control in uplink and downlink for downlink packet transfer in circuit mode is extremely costly from capacity and UE power consumption perspective. This recommendation is related to the future E-DSCH design and the uplink/downlink signaling associated with that channel.

  22. Summary of recommendations • Fast de-allocation of DCH/DSCH+DCH or DCH/DCH for large bursty downloads is desirable (This issue is already treated) • Improvement of OLPC on FACH (Latest proposal to be presented) • Introduce CR on RACH (No proposal yet) • Avoid DCH/DCH for transfer of uplink bursty packet data since it degrades both the downlink and uplink capacity • Avoid circuit mode (continuous dedicated uplink and downlink) in the future HSPD design (separate contribution for HSDPA discussion).

  23. Summary of Discussion points on Cell-FACH state and OLPC-FACH • Use of Cell-FACH state is desirable from the capacity, resource utilization and power consumption perspectives [3GPRS] • In practice, the open loop power control estimate for slow and medium speed environments might be an old estimate degrading the performance. • In order to capture the advantages of operating in cell-FACH state for bursty download transfers, the operation of OLPC on FACH should be improved.

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