TD-SCDMA
Technology Overview
TD-SCDMA (time division - synchronous code division multiple access) is a cellular technology based on the combination of a TDMA (time division multiple access) component and a CDMA (code division multiple access) component. Additionally, unique synchronization mechanisms are foreseen for optimizing the time division duplex (TDD) mode of operation. The uplink and downlink are separated in time, i.e. specific timeslots within one time frame are assigned separately to uplink and downlink transmission.
Deployment Scenario
TD-SCDMA can be deployed as a 1.28 Mcps TDD mode in UMTS TDD bands. The standard also foresees integration with UMTS WCDMA (FDD) and GSM/GPRS networks, i.e. mobility between the various technologies is supported.
Rohde & Schwarz Test Solutions
Rohde & Schwarz offers test solution for TD-SCDMA from R&D up to production. Dedicated software options for TD-SCDMA signal generation including channel coding and TD-HSDPA functionality are available for evaluating components, power amplifiers, and receivers in user equipment and base stations. For transmitter tests, TD-SCDMA software options for the Rohde & Schwarz signal and spectrum analyzer family are available as well. For production testing of wireless devices, the R&S®CMW500 wideband radio communication tester non-signaling solution for TD-SCDMA is the optimum choice.
Key Parameters
| TD-SCDMA | |
|---|---|
| Frequency Range |
Show / Hide
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| Modulation |
QPSK, 8PSK 16QAM (HSPA) 64QAM (HSPA+) |
| Multiple Access | TD-SCDMA, FDMA |
| Duplex (Uplink/Downlink) | TDD |
| Channel Bandwidth | 1.6 MHz |
| Peak Data Rate | 2 Mbit/s
(DL, UL) 2.8 Mbit/s (DL, HSDPA) 2 Mbit/s (UL, HSUPA) 8.4 Mbit/s (DL, HSPA+) 5 Mbit/s (UL, HSPA+) |
Standardization
TD-SCDMA was introduced as a UMTS low chip rate TDD mode (1.28 Mcps TDD) in Release 4 specifications of 3GPP (3rd Generation Partnership Project).
Further enhancements such as high-speed downlink packet access (HSDPA) and enhanced uplink (high-speed uplink packet access, HSUPA) for the 1.28 Mcps TDD mode were introduced in 3GPP Releases 5 and 7, respectively. HSPA+ features for TDD are part of 3GPP Release 8.
UMTS Long Term Evolution (LTE) as specified in 3GPP Release 8 will provide the long term evolution path for TD-SCDMA. The TDD mode of LTE is also referred to as TD-LTE.
The following link provides access to 3GPP specifications: http://www.3gpp.org/ftp/Specs/
