1. Dynamic Channel Allocation and Power Control
M. Schwartz
Mobile Wireless Communications
Chapter 4
2007
WNRL/KWU

2. DCA & PC Methods used to improve (cellular) system performance DCA PC
Dynamic Channel Allocation
Reducing call blocking probability PC
Power Control
Reducing interference
2007
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
2007
WNRL/KWU

4. Channel Locking & Directional Locking
2007
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
2007
WNRL/KWU

6. Borrowing of channels does not propagate
2007
WNRL/KWU

7. 2007
WNRL/KWU

8. How many possible states in total?
2007
WNRL/KWU

9. 2007
WNRL/KWU

10. Blocking Probability of Cell i
2007
WNRL/KWU

11. How to calculate P(x1,x2,x3) ?
2007
WNRL/KWU

12. Product-form Solution
2007
WNRL/KWU

13. 2007
WNRL/KWU

14. Homework
Problem 4.3
Problem 4.4
2007
WNRL/KWU