WCDMA and cdma2000区别

francisey

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【简　介】:
Development of the 3G CDMA systems for IMT-2000 is oriented towards a wider set of services than provided in second generation cellular systems. Both WCDMA and cdma2000 are to provide these new services. Since currently deployed CDMA systems have been the source of many of the new ideas behind using CDMA for cellular and PCS applications, there are naturally similarities between the two RTTs. Furthermore, harmonization activities have brought the RTT contributions even closer. So, first we list similarities and then discuss more extensively the residual differences, which have not yet been converged by the continuing harmonization efforts. The similarities are mainly at a functional and conceptual level. Many of the technical details such as nomenclature, timing, and precise parameters are different, due to parallel on-going standardization efforts. This is true for both the physical layer and lower layers.

【目　录】:
SUMMARY
Table of Contents
Introduction
Major Conceptual Similarities
Major Differences
Chip Rate
Migration from existing technologies
Numerology
Eb/No Requirement
Overall Capacity
Out of Band Emissions
Summary of Chip Rate Comparison
Forward Link Pilot Structure
Basic Fundamental Approaches
Dedicated Time Multiplexed Pilot (DTMP)
Common Code Multiplexed Pilot (CCMP)
Base Station Synchronization
Base Station Acquisition and Detection
Terminal Battery Life Characteristics
Dedicated Mode
Idle Mode
Inter-Frequency Hard Handoff and Hierarchical Cell Structure (HCS)
Frame Length
Differences in Deployment Possibilities
Benefits of 1.25 MHz Deployment Option
Deployment in 2x 5 MHz
Band Packing and Band Planning
Benefits of Multi-Carrier Spreading Option
Appendix 1 – Numerology
Appendix 2 - Overall Capacity
Appendix 3 - Emission Limits
Filter Characteristic
Output Power Level
Impact on Forward Link Capacity
Appendix 4 – cdma2000 Inter-frequency Hard Handoff procedures
Inter-frequency Search Procedure
Minimizing Impact of Search Excursion on Current Frame
Off-Line Pilot Searching
Increasing Symbol Energy of Current Frame
Forward Link Power Control during Search Visit
Reverse Link Power Control during Search Visit
Search excursion position within a frame
Hard Handoff Failure Recovery
References