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Wireless Communications Technology

Wireless Communications Technology. (Exam Prep) Lesson 4: TDMA Bellevue Community College Bob Young, Instructor. TDMA. Time Division Multiple Access. New Features. See text, page 82 IS-54 IS-136. Terminology. Common terms and abbreviations. IMSI.

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Wireless Communications Technology

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  1. Wireless Communications Technology (Exam Prep) Lesson 4: TDMA Bellevue Community College Bob Young, Instructor

  2. TDMA Time Division Multiple Access

  3. New Features See text, page 82 IS-54 IS-136

  4. Terminology Common terms and abbreviations

  5. IMSI International Mobile Subscriber Identification

  6. MSC Mobile Switching Center

  7. DVCC Digital Verification Color Code Replaces SAT

  8. LOCAID Location Identifier Assigned to a cluster of cells

  9. SOC System Operator Code Identifies the carrier Aids in roaming and billing

  10. DCCH Digital Control Channel Both forward and reverse In addition to AMPS FOCC and RECC

  11. Time Slots • Six time slots • Three voice channels • Slots 1 & 4, 2 & 5, 3 & 6

  12. Modulation, part 1 p/4 DQPSK (Differential Quaternary Phase Shift Keying) System looks at phase changes, not absolute phase

  13. Modulation, part 2 +45 degrees = 00 -45 degrees = 10 +135 degrees = 01 -135 degrees = 11

  14. DTCH, part 1 Digital Traffic Channel Instead of the FVC and RVC Contains a number of logical channels

  15. DTCH, part 2 • See chart on page 92. • DVCC (Digital Verification Color Code) • SACCH (Slow Associated Control Channel) • FACCH (Fast Associated Control Channel)

  16. Sleep Mode Timing sequence permits the portable to "go to sleep" and wake up when it's time to look for messages addressed to it. Great improvement in battery life.

  17. MAHO • Mobile Assisted Handoff • Mobile uses unused frames to measure the received bit error rate • It reports the channel quality on the SACCH

  18. Authentication • See description beginning on page 100. • Shared Secret Data (SSD) • Authentication Key (A-key)

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