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Cellular Networks Positioning Performance Analysis Reliability Part 10

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Tham khảo tài liệu 'cellular networks positioning performance analysis reliability part 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Mobility and QoS-Aware Service Management for Cellular Networks 259 0.5 0.4 0.3 0.2 0.1 0 --- ThD 0.90 - - ThD 0.75 . ThD 0.60 2 Hancioff newcail rate 8 0.1 0.08 0.06 0.04 0.02 - 0 -0 --- ThD 0.90 - - ThD 0.75 . ThD 0.60 2468 Handoff newcall rate b a 0.5 0.4 ThD 0.90 - - ThD 0.75 . ThD 0.60 0.3 0.2 0.1 0.1 0.08 0.06 o 0.04 Q 0.02 --- ThD 0.90 - - ThD 0.75 . ThD 0.60 0- -r- V- 0246 Hancoff newcall rate 10 c d Fig. 5. Block and handoff drop probabilities on the downlink when varying the new handoff rate MS 10s using different load thresholds in indoor a b and outdoor c d environments. policy both handoff and new calls are accepted if enough capacity exists to accomodate thier needs no portion of the capacity is restricted for access of either type of call. This approach was selected by Chang Chen 2006 Das et al. 2000 . Our proposed policy gives incoming handoff calls a priority over new calls when call rejection becomes necessary that is when no capacity is available. Note that for simplicity from here after the drop and block probabilities include both the uplink and downlink ones. Fig.6 shows that in indoor environment the handoff drop probability of our policy is below that of EP scheme by a difference that varies from 1 for a handoff rate of 1 to about 20 for a rate of 10. This is because our module gives the priority to handoff services compared to the EP scheme which does not differentiate handoff and new services. However our block probability is higher than that of EP scheme by a difference that varies from 1 to 5 . It is clear that our gain in handoff admission surpasses the loss in new service admission. Fig.6 demonstrates also the drop block probability for 3 guard capacities of GC scheme. We observe that our handoff admission probability has a comparable performance with the GC scheme. It outperforms that of the 0.2 and 0.4 guard capacities by up to 7 and 2.5 respectively. However the 0.6 guard capacity surpasses it by up to 2 for a handoff rate 260 .