WCDMA

How WCDMA Uu Interface

WDMA Air interface or Uu Interface contains 3 layers which describe as follow, The WCDMA layer 1 supports all functions required for the transmission of bit streams on the physical...
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UMTS Network Structure

UTRAN (UMTS Terrestrial Radio Access network) structure The UTRAN consists of one or several Radio Network Subsystem ( RNS ), each containing one RNC and one or several NodeB. Interface...
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Closed Loop Mode Transmit Diversity in UMTS

UMTS Closed Loop Mode Transmit Diversity Used in DPCH and HS-PDSCH. The closed-loop-mode transmit diversity can only be applied to the UMTS downlink channel if there is an associated UMTS...
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Time switching transmit diversity TSTD in UMTS

Time switching transmit diversity TSTD in UMTS is used only on UMTS SCH channel Time-switched transmit diversity (TSTD) can be applied to the UMTS SCH. Just like Space time block...
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Space time block coding based transmit antenna diversity STTD in UMTS

The TX diversity methods in the open-loop mode are as below Space time-block coding-based transmit-antenna diversity (STTD) Time-switched transmit diversity (TSTD). In UMTS STTD the data to be transmitted is...
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Random Access Procedure in UMTS

In This article I write about step of Physical random access procedure in umts. As shown in below figure steps is as below. Derive the available uplink access slots, in...
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How Cell Search in wcdma – initial Synchronization Procedure

Cell Search Procedure purpose is to give the UE the possibility of finding a wcdma cell and of determining the downlink scrambling code and frame synchronization of that wcdma cell....
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How Channel Mapping in WCDMA

Here I Write about how the mapping can be done between logical, transport and physical channels. Not all physical channels are represented because not all physical channels correspond to a...
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What is High-Speed Shared Control Channel HS-SCCH and its work in 3G WCDMA

Carries physical layer signaling to a single UE, such as modulation scheme (1 bit), channelization code set (7 bit), transport block size (6bit), HARQ process number (3bit), redundancy version (3bit),...
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What is HS-PDSCH in WCDMA and How High-Speed Physical Downlink Shared Channel works in 3G

HS-PDSCH in WCDMA mainly for 2 works, Bearing service data and layer 2 overhead bits mapped from the transport channel SF=16, can be configured several channels to increase data service...
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PRACH Message Structure and Access Timeslot Structure

Here I write about PRACH Message Structure and PRACH Access Timeslot Structure for WCDMA 3G with its Flow in Image. The data and control bits of the message part are...
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Physical Random Access Channel PRACH work for WCDMA

PRACH Physical Random Access Channel work in WCDMA Carrying uplink signaling and data, consist of two parts: One or several preambles: 16 kinds of available preambles 10 or 20ms message...
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