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Dynamic Channel Allocation and Power Control

Dynamic Channel Allocation and Power Control. M. Schwartz Mobile Wireless Communications Chapter 4. DCA & PC. Methods used to improve (cellular) system performance DCA Dynamic Channel Allocation Reducing call blocking probability PC Power Control Reducing interference. FCA vs. DCA.

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Dynamic Channel Allocation and Power Control

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  1. Dynamic Channel Allocation and Power Control M. Schwartz Mobile Wireless Communications Chapter 4 WNRL/KWU

  2. DCA & PC • Methods used to improve (cellular) system performance • DCA • Dynamic Channel Allocation • Reducing call blocking probability • PC • Power Control • Reducing interference WNRL/KWU

  3. FCA vs. DCA • Fixed Channel Allocation • Many DCA algorithms proposed • Low/moderate traffic • All DCA schemes outperform FCA • Heavy traffic • Few channels are free • Channel locking due to the reuse constraint • FCA is better • Hybrid schemes proposed WNRL/KWU

  4. Channel Locking & Directional Locking WNRL/KWU

  5. BDCL DCA • Borrowing with Directional Channel Locking • Proposed by Zhang & Yum • Specification of lock directions • Channel ordering • Lowest numbered channel has the highest priority to the local call • Highest numbered one has the highest priority to be borrowed • Immediate channel reallocation • Pack channels used by local calls closely together • Borrowed calls are packed together as well WNRL/KWU

  6. Borrowing of channels does not propagate WNRL/KWU

  7. WNRL/KWU

  8. How many possible states in total? WNRL/KWU

  9. WNRL/KWU

  10. Blocking Probability of Cell i WNRL/KWU

  11. How to calculate P(x1,x2,x3) ? WNRL/KWU

  12. Product-form Solution WNRL/KWU

  13. WNRL/KWU

  14. Homework • Problem 4.3 • Problem 4.4 WNRL/KWU

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