Wireless Future - Telenor

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throughput bit/s 80 3 2.5 2 1.5 1 0.5 0 0 x 10 7 mode 2 mode 3 mode 1 5 10 15 20 25 30 35 40 45 50 a) no. of connections b) OFDM symbols 350 300 250 200 150 100 50 0 0 overhead Lbpt (mode 2/3) 5 10 15 20 25 30 35 40 45 50 no. of connections Lupt (mode 2/3) Lupt (mode 1) Lbpt (mode 1) Figure 8 a) Throughput for different PHY modes versus number of connections for one terminal; b) corresponding overhead characteristics Figure 9 Throughput for mode 1 Figure 10 Throughput for mode 2 throughput bit/s throughput bit/s 3 2.5 2 1.5 1 0.5 0 0 3 2.5 2 1.5 1 0.5 x 10 7 x 10 7 0 0 10 10 20 no. of MTs 20 no. of MTs 30 30 mode 1 40 mode 2 40 0 0 5 5 10 no. of connections 10 no. of connections 15 15 20 20 Ldpt Telektronikk 1.2001
throughput bit/s 3 2.5 2 1.5 1 0.5 x 10 7 0 0 1) the gradient of the L UPT is 1 / 10 compared to the first scenario (5/k and 0.5/n, respectively). In addition the gradient of L BPT (in the second scenario) is considerably smaller than the L DPT in the first scenario. The overall result is that the throughput for mode 1 decreases more slowly with the number of connections than with the number of MTs. For mode 2 and 3 the gradient of L UPT and L DPT is smaller in the second scenario, but is offset by a larger increase in the gradient for the L BPT . The result is that the overall throughput of the first and second scenario is similar. The throughputs of mode 1, 2 and 3 for different numbers of MTs and active connections are shown in Figure 9, Figure 10 and Figure 11, respectively. Mode 1 gives a maximum throughput of nearly 28 Mbit/s (k = 1, MT = 1), and the throughput is inverse proportional with the number of MTs and the number of connections. From Figure 9 it can be seen that when the number of MTs exceeds 30 (k > 30) and the number of connections exceeds 16 (n > 16), the size of the overhead exceeds or equals the number of available OFDM symbols, resulting in zero throughput. For mode 2 (see Figure 10) the maximum throughput is similar to mode 1 (~28 Mbit/s), but the number of terminals and connections that can be supported is considerably smaller than for mode 1. For instance, the overhead exceeds or equals the number of available OFDM symbols at k = 40, n = 2 or k = 5, n Telektronikk 1.2001 10 20 no. of MTs 30 mode 3 40 0 5 10 no. of connections = 20. For mode 3 (see Figure 11), the region for zero throughput is similar to mode 2. The maximum throughput (~4.6 Mbit/s) for mode 3 is however significantly lower than that of mode 2. These examples clearly illustrate that N DBPS(FCH) , N DBPS(SCH) together with k and n determine the overhead size (and thereby the number of terminals and connections that can be supported), whereas N DBPS(LCH) determines the throughput for a given overhead size. Consider an AP serving 10 terminals with two active connections each. For PHY mode 6 (Figure 9) the MAC throughput will be 26.9 Mbit/s, or a MAC efficiency of 75 %. In a worst case scenario, for PHY mode 1 (Figure 11) the MAC throughput will be 3.2 Mbit/s or a MAC efficiency of 53 %. This illustrates that the throughput of the HIPERLAN/2 will be high, even for poor radio conditions. In this section the throughput (or the overhead) of the MAC protocol has been investigated for a number of settings. It has been shown that the number of MTs and active connections, as well as the PHY mode used on the different PDU trains influence the throughput. Using robust PHY modes will reduce the throughput but will be essential for operation in harsh radio conditions. It has been shown that the PHY modes used in FSC and SCH determine the number of terminals and connections that can be supported. 15 20 Figure 11 Throughput for mode 3 81
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Telektronikk Volume 97 No. 1 - 2001
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Per Hjalmar Lehne (42) obtained his
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Stein Svaet (41) is Senior Research
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Pbit/day 6 150 125 100 75 50 25 0 F
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8 Video communication as a utility
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10 The idea of reconfigurable mobil
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12 Switched lobe Dynamically phased
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Figure 10 The All IP vision Figure
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16 The IP world has some problems t
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18 Abbreviations and acronyms less
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Jorge Pereira (40) obtained his Eng
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(Millions) Figure 1 Exponential gro
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24 Defining Generation based upon D
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Multi-mode Terminal by Software Rad
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distribution layer possible return
Page 32 and 33: 30 A Co-Ordinated Approach to 4G As
Page 34 and 35: Figure 2 Applications will grow fas
Page 36 and 37: Figure 5 Evolution from multi-mode
Page 38 and 39: Operator/Provider download librarie
Page 40 and 41: Radio network subsystem - service c
Page 42 and 43: Dr. Techn. Jørgen Bach Andersen (6
Page 44 and 45: Figure 3 Two arrays with M and N el
Page 46 and 47: Figure 5 Cumulative probability dis
Page 48 and 49: Figure 8 As in Figure 5, but with F
Page 50 and 51: 48 Conclusion The challenge of prov
Page 52 and 53: 50 models are described simply by a
Page 54 and 55: 52 ping intervals or “quantizatio
Page 56 and 57: Figure 3 ASE as a function of the a
Page 58 and 59: 56 7 Conclusion and Further Researc
Page 60 and 61: Dave Wisely (39) graduated in 1982
Page 62 and 63: Figure 2 Business case study Figure
Page 64 and 65: Figure 6 BRAIN QoS architecture 62
Page 66 and 67: 64 4 BRAIN homepage. (2001, March 6
Page 68 and 69: Figure 2 The Bluetooth protocol sta
Page 70 and 71: Figure 5 A Bluetooth radio module i
Page 72 and 73: 70 • Instant postcard: A Bluetoot
Page 74 and 75: 72 work visions come true, it is ne
Page 76 and 77: Table 1 Allocated HiperLAN bands (i
Page 78 and 79: Figure 4 Basic MAC frame structure
Page 80 and 81: 78 Preamble BCH FCH ACHs Preamble S
Page 84 and 85: 82 5 References 1 CEPT. ERC Decisio
Page 86 and 87: 84 IETF Internet Engineering Task F
Page 88 and 89: Figure 2-3 Mobile IPv6 architecture
Page 90 and 91: 88 domain, it attaches to a new lea
Page 92 and 93: 90 Domain GFA/MAP Figure 3-3 Archit
Page 94 and 95: Geir Gylterud (35) is Research Scie
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Page 98 and 99: Figure 6 SCSs and network functiona
Page 100 and 101: Figure 9 The new business model. Fr
Page 102 and 103: 100 A strong consortium backs up th
Page 104 and 105: 102 Music Company Figure 3 Service
Page 106 and 107: Figure 4 OSA architecture service c
Page 108 and 109: Do van Thanh (43) obtained his MSc
Page 110 and 111: Figure 2 The first use case diagram
Page 112 and 113: 110 Box 1 - The Open Service Archit
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Page 116 and 117: Figure 10 Initiating call from PSTN
Page 118 and 119: Figure 13 Splitting the incoming st
Page 120 and 121: Figure 17 A set of communication de
Page 122 and 123: 120 Box 3 continued Session Descrip
Page 124 and 125: Figure 21 A laptop and peripheral d
Page 126 and 127: 124 Box 4 - Bluetooth Bluetooth is
Page 128 and 129: 126 6 The ICEBERG project. (2001, M
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? Figure 1 The Mobile Service Platf
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Figure 2 Needs and Related Services
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134 Telektronikk 1.2001
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136 Telektronikk 1.2001
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Anne Lise Lillebø (52) is Adviser
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140 with other SDOs (Standards Deve
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142 Box 2 - ETNO Declaration We, th
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Arve Meisinset (52) is Senior Resea
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146 In ITU-T we have seen needs to
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148 Each viewpoint constitutes a se
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Figure 2 UML class diagrams for tra
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152 The functionality describing th
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154 9 Potter, B et al. An introduct
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Wireless Future - Telenor

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