00-WCDMA HSDPA Principles.pdf

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Giới thiệu HSDPA ISSUE 1.0 www.huawei.com Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved. Contents 1. Khá Khái niệm về HSDPA 2. Các kỹ thuật cho HSDPA Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved. Page1 1 WCDMA Evolution Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved. Page2 Phiên bản 99 Dữ liệu gói Dữ liệu gói được xử lý thế nào trong phiên bản 99 (FDD) DCH ( Kênh được gán ) Mã trải phổ được gán cho mỗi người dùng Vòng điều
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  1 www.huawei.com Copyright ©2006 Huawei Technologies Co., Ltd. All rights reserved. Gi ớ  i thi ệ u HSDPA ISSUE 1.0 Page1Copyright ©2006 Huawei Technologies Co., Ltd. All rights reserved. Contents 1.1. Kh Kh á áii ni ni ệệ  m mvv ềề  HSDPA HSDPA 2.Cáck  ỹ thu ậ tchoHSDPA  2 Page2Copyright ©2006 Huawei Technologies Co., Ltd. All rights reserved. WCDMA Evolution Page3Copyright ©2006 Huawei Technologies Co., Ltd. All rights reserved. Phiênb ả n99 D ữ li ệ ugói  D ữ  li ệ ugói đư ợ cx ử  lýth ế  nàotrongphiênb ả n99 (FDD)  DCH ( Kênh đư ợ cgán)  Mãtr ả iph ổ  đư ợ cgánchom ỗ ing ư ờ idùng  Vòng đ i  ề ukhi ể  ncôngsu ấ  tkín  Chuy ể  ngiaom  ề m  FACH ( Kênhchung)  Mãtr ả iph ổ  chung  Khôngcóvòng đ i  ề ukhi ể  ncôngsu ấ  tkín  Khôngcóchuy ể  ngiaom  ề m  3 Page4Copyright ©2006 Huawei Technologies Co., Ltd. All rights reserved. Release 99 Downlink Limitation  Dedicated Channel Features ( DCH )  Maximum implemented downlink of 384kbps  OVSF code limitation for high data rate users  Rate switching according to burst throughput is slow  Outer loop power control responds slowly to channel  Common Channel Features ( FACH )  Good for burst data application  Only low data rates supported  Fixed transmit power Page5Copyright ©2006 Huawei Technologies Co., Ltd. All rights reserved. High Speed Downlink Packet Access (HSDPA)  The differences between HSDPA and R99  Set of high data rate channel  Channels are shared by multiple users  Each user may be assigned all or part of the resource every 2 ms NodeB HS-PDSCH  4 Page6Copyright ©2006 Huawei Technologies Co., Ltd. All rights reserved. High Speed Downlink Packet Access (HSDPA)  How will HSDPA figure out the limitations of R99  Adaptive modulation and coding  Fast feedback of Channel condition  QPSK and16QAM  Channel coding rate from 1/3 to 1  Multi-code operation  Multiple codes allocated per user  Fixed spreading factor  NodeB fast Scheduling  Physical Layer HARQ ( Hybrid Automatic Repeat reQuest) Page7Copyright ©2006 Huawei Technologies Co., Ltd. All rights reserved. High Speed Downlink Packet Access (HSDPA)  Comparison Summary
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