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Site Selection Diversity Transmit Power Control (SSDT)

Learn about Site Selection Diversity Transmit (SSDT) technology for improved mobile network performance. Understand how SSDT optimizes power control and enhances downlink transmissions with Multiple Reception Combining (MRC) and Soft Handoff (SHO) techniques. Explore the interference contributions and technical refinements of SSDT in 3GPP standards.

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Site Selection Diversity Transmit Power Control (SSDT)

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  1. Site Selection Diversity Transmit Power Control (SSDT)

  2. MS1 BS2 TxBTS1 = TxBTS2 MS2 BS1 SHO Downlink Transmissions with MRC.

  3. TxBTS2 MS1 BS2 TxBTS1 = 0 MS2 BS1 SHO Downlink Transmissions with SSDT.

  4. MRC SSDT 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 -80 -60 -40 -20 0 20 40 60 Tx Power with MRC and SD (for each BTS) P(x>) Two-way SHO 1 cell Three-way SHO Tx Power (dBm)

  5. 0.04 MRC SSDT 0.035 0.03 0.025 0.02 0.015 0.01 0.005 -220 -200 -180 -160 -140 -120 -100 -80 -60 Interference Contributions of MRC and SSDT (3-Way soft-handoff) P(x) MRC Mean = -123.4 SSDT Mean < -129.0 0 Int. Power (dBm) (downlink case)

  6. Downlink data1 MS broadcasts selected BS with Cell ID code which consists of several feedback bits BS2 (ID:10) 01 10 Downlink data2 MS More sophisticated Cell ID code can be considered BS1 (ID:01) Candidate Cell Broadcast by MS (Cell ID code-word)

  7. Technical Refinements • Feed Back Information(FBI) bit. • Relation with Tx Diversity in SHO. • - Dual-operation of SSDT and Tx Div in 3GPP • Signalling • - Cell ID code. • - Up-date rate.

  8. SSDT Status in 3GPP • SSDT was first proposed at ETSI SMG2 in ‘98 • Intensive discussions are made mainly in 3GPP TSG-RAN1 • SSDT related text was included in 7 Release ‘99 documents • - SSDT procedure : TS25.214 • - Layer 1 signaling : TS25.211 • - Functionality requirements of BS: TS25.133 • - Performance requirements and testing: • TS25.101, TS34.121, TS25.104, TS25.141

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