Title page
Abstract
Contents
I. Introduction 12
1.1 Background 12
1.1.1 Time Division Duplexing and Inherent Interference Types 12
1.1.2 Hybrid Division Duplexing 17
1.2 Objective and Previous Work 19
1.3 Organization 21
II. TDD Time Slot Allocation Scheme for Symmetric Traffic 22
2.1 Introduction 22
2.2 Interference Scenario in Sectorized TDD 23
2.3 Proposed TSA Strategy 28
2.4 Analysis 29
2.5 Simulation and Results 31
2.5.1 Simulation Environment 31
2.5.2 Simulation Results 32
2.6 Conclusion 34
III. TDD Time Slot Allocation Scheme for Asymmetric Traffic 35
3.1 Introduction 35
3.2 TSA Strategy 1 for Asymmetric Traffic 36
3.3 TSA Strategy 2 for Asymmetric Traffic 37
3.4 Simulation and Results 39
3.4.1 Simulation Environment 39
3.4.2 Simulation Results 39
3.5 Conclusion 41
IV. TDD Interference Analysis and Time Slot Allocation for HDD Cellular Systems 48
4.1 Introduction 48
4.2 TSA Pairs and Interference Analysis 51
4.3 Frame Level TSA Strategies 55
4.4 Simulation and Results 55
4.4.1 Simulation Environment 55
4.4.2 Simulation Results 57
4.5 Conclusion 59
V. Conclusion and Future Work 61
References 64
Acknowledgement 67
[Figure 1.1] Different-entity interference (a) BS to MS; (b) MS to BS 15
[Figure 1.2] Same-entity interference (BS to BS and MS to MS) 16
[Figure 1.3] (a) HDD frequency planning; (b) Cell structure for HDD systems (Borrowed from [1]) 18
[Figure 2.1] Proposed system description 24
[Figure 2.2] Interference scenarios in sectorized TDD environment 25
[Figure 2.3] (a) Proposed TSA for symmetric traffic; (b) Traditional All-uniform TSA for symmetric traffic 28
[Figure 2.4] Symmetric traffic, SIR outage probability performance 33
[Figure 3.1] TSA strategy 1 for symmetric traffic 36
[Figure 3.2] TSA strategy 2 for symmetric traffic 38
[Figure 3.3] UL SIR outage probability performance, Asymmetric traffic with standard dev. 1 (1/12 = 8% of the maximum number of time slots) 42
[Figure 3.4] DL SIR outage probability performance, Asymmetric traffic with standard dev. 1 (1/12 = 8% of the maximum number of time slots) 42
[Figure 3.5] UL SIR outage probability, Asymmetric traffic with standard dev. 3 (3/12 = 25% of the maximum number of time slots) 43
[Figure 3.6] DL SIR outage probability, Asymmetric traffic with standard dev. 3 (3/12 = 25% of the maximum number of time slots) 43
[Figure 3.7] UL SIR outage probability, Asymmetric traffic with standard dev. 5 (5/12 = 42% of the maximum number of time slots) 44
[Figure 3.8] DL SIR outage probability, Asymmetric traffic with standard dev. 5 (5/12 = 42% of the maximum number of time slots) 44
[Figure 3.9] UL SIR outage probability performance for required SIR of 15dB, as function of the standard deviation (sigma) of the traffic 45
[Figure 3.10] DL SIR outage probability performance for required SIR of 15dB, as function of the standard deviation (sigma) of the traffic 45
[Figure 3.11] Dropping rate of traffic request as function of the standard deviation (sigma) of the traffic 46
[Figure 3.12] Asymmetric traffic (sigma = 3), throughput (normalized) performance. TFA = Traditional TSA with system-average; PFA = Proposed TSA with system-average 47
[Figure 4.1] (a) HDD frequency planning; (b) Cell structure for HDD systems (Borrowed from [1]) 49
[Figure 4.2] TDD TSA pairs for HDD systems 50
[Figure 4.3] Distance between entities in the two cells 52
[Figure 4.4] TSA in a frame (6 different possibilities) 54
[Figure 4.5] Mean SIR in cell 1 for each allocation pair 56
[Figure 4.6] SIR outage probability in cell 1, over a frame (24 time slots) 58
[Figure 4.7] SIR outage probability performance in cell 1 58