Outcome of Web meeting Draft Manual as at end of Day 2 V2

2.11.11 Scenario description

2.11.11.1 This section describes foreseeable scenarios of the AeroMACS access network. Scenarios are defined by the placement of the BS in the airport surface, and the proportion of users of each type present on the airport surface. Both factors define the ratio of each user that is present in each BS on the surface.

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  Scenario 1. Video surveillance - Represents a scenario in which AeroMACS is used solely to support fixed video surveillance cameras for security control and operation safety monitoring and record.
  
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  Scenario 2A. Integrated surface management system - Represents a scenario in which video, sensor networks and surface vehicles are functioning on the airport surface executing local applications enabling A-SMGCS and surface operation support.
  
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  Scenario 2B. Same as Scenario 2A but without including video surveillance sensors.
  
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  Scenario 3A. Surface management and aircraft turnaround - Represents a scenario with local services as above, and enables CPDLC and AOC applications with onboard subscribers on the aircraft to support the turnaround process and maintenance. For simplicity, it is assumed that aircraft at the gates occupy all the resources of the dedicated micro-cells at the gates.
  
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  Scenario 3B. Same as Scenario 3A but without including video surveillance sensors.
  

ASSUMPTION: Table 4 below indicates the proportion of cell bandwidth dedicated to each type of users serviced by a BS in each of the scenarios considered.

AeroMACS Scenarios	% A/C at gate	% A/C at hangar, taxiway or runway	% Surface vehicles	% Video sensors	% Ground critical	% Ground default
Scenario 1	-	-	-	100	-	-
Scenario 2A	-	-	30	50	10	10
Scenario 2B	-	-	80	-	10	10
Scenario 3A^0	100 (only micro-cells)	50	15	30	2.5	2.5
Scenario 3B^6	100 (only micro-cells)	70	25	-	2.5	2.5

Table 4. AeroMACS network scenarios considered, and % of throughput dedicated to each user type
2.11.11.2 The results on capacity are given per BS in this study. In order to derive aggregate capacity in an entire AeroMACS access network, airport categories are based on number of movements and may be used to define the amount of BSs deployed on the airport surface. The following airport size types are proposed in line with reference [4].

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  Small (20 operations/hour) – 3 BS
  
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  Medium (50 operations/hour) – 9 BS
  
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  Large (100 operations/hour) – 15 BS
  

2.11.11.3 When calculating the aggregate capacity in the entire AeroMACS network dependent on the number of BS deployed in the airport surface, the limitation of 11 channels available for transmission needs to be taken into account. Such constraint requires frequency reuse and may result in a lower capacity offered per BS.

10 . . 2.11.12 Analysis results (for capacity constraints)

2.11.12.1 Each scenario is defined by a data rate required per user type and a proportion of user types.

The results of the analysis are given in the form of number of users than can be reasonably supported by a BS. Given all the assumptions in the previous sections, the maximum number of users is derived for each scenario based on the user throughput requirements (Table 1) to be able to serve given the user type ratio in the corresponding scenario (Table 4) within the throughput constraints (Table 3). Note that a margin is left in the form of unused throughput in order to account for a certain amount of peak traffic that may be caused by a user in the cell. The level of margin assumed per cell is based on the peak throughput requirements in Table 1.
2.11.12.2 Tables 5, 6, 7 and 8 below identify the resulting maximum number of users for the different scenarios and different DL/UL ratios considered.

Type of BS	#Video sensors	Remaining throughput (margin)
		FL	RL
Micro	18	3.28 Mbps (99.5%)	548 kbps (32.2%)
Macro	7	1.99 Mbps (99.6%)	552 kbps (55.2%)

Table 5a. Maximum number of users (per channel) - Scenario 1, DL/UL OFDM symbol rate (32,15)

Type of BS	#Video sensors	Remaining throughput (margin)
		FL	RL
Micro	24	2.67 Mbps (99.1%)	564 kbps (26.8%)
Macro	13	1.69 Mbps (99.2%)	568 kbps (40%)

Table 5b. Maximum number of users (per channel) - Scenario 1, DL/UL OFDM symbol rate (26,21)

Type of BS	#Surface vehicles	#Video sensors	#Ground critical	#Ground default	Remaining throughput (margin)
					FL	RL
Micro	35	9	115	115	2.75 Mbps (83.3%)	544 kbps (32%)
Macro	13	3	45	45	1.8 Mbps (90%)	588 kbps (58.8%)

Table 6a. Maximum number of users (per channel)- Scenario 2A, DL/UL OFDM symbol rate (32,15)

Type of BS	#Surface vehicles	#Video sensors	#Ground critical	#Ground default	Remaining throughput (margin)
					FL	RL
Micro	50	12	150	150	1.98 Mbps (73.6%)	532 kbps (24.6%)
Macro	20	8	65	65	1.4 Mbps (82.4%)	558 kbps (39.8%)

Table 6b. Maximum number of users (per channel)- Scenario 2A, DL/UL OFDM symbol rate (26, 21)