Dynamic Channel Allocation and Power Control

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Presentation transcript:

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

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

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

Channel Locking & Directional Locking 2007 WNRL/KWU

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

Borrowing of channels does not propagate 2007 WNRL/KWU

2007 WNRL/KWU

How many possible states in total? 2007 WNRL/KWU

2007 WNRL/KWU

Blocking Probability of Cell i 2007 WNRL/KWU

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

Product-form Solution 2007 WNRL/KWU

2007 WNRL/KWU

Homework Problem 4.3 Problem 4.4 2007 WNRL/KWU