-
Notifications
You must be signed in to change notification settings - Fork 13
/
NRBaseStation.py
256 lines (212 loc) · 10.2 KB
/
NRBaseStation.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
import environment
import math
from scipy import constants
import util
#Table 5.3.3-1: Minimum guardband [kHz] (FR1) and Table: 5.3.3-2: Minimum guardband [kHz] (FR2), 3GPPP 38.104
#number of prb depending on the numerology (0,1,2,3), on the frequency range (FR1, FR2) and on the base station bandwidth
NRbandwidth_prb_lookup = {
0:[{
5:25,
10:52,
15:79,
20:106,
25:133,
30:160,
40:216,
50:270
}, None],
1:[{
5:11,
10:24,
15:38,
20:51,
25:65,
30:78,
40:106,
50:133,
60:162,
70:189,
80:217,
90:245,
100:273
}, None],
2:[{
10:11,
15:18,
20:24,
25:31,
30:38,
40:51,
50:65,
60:79,
70:93,
80:107,
90:121,
100:135
},
{
50:66,
100:132,
200:264
}],
3:[None,
{
50:32,
100:66,
200:132,
400:264
}]
}
class NRBaseStation:
bs_type = "nr"
def __init__(self, bs_id, total_prb, prb_bandwidth_size, number_subcarriers, numerology, antenna_power, antenna_gain, feeder_loss, carrier_frequency, total_bitrate, position, env):
if position[2] > 200 or position[2] < 30:
raise Exception("COST-HATA model requires BS height in [30, 200]m")
if (carrier_frequency < 150 or carrier_frequency > 2000):
raise Exception("your results may be incorrect because your carrier frequency is outside the boundaries of COST-HATA path loss model")
self.prb_bandwidth_size = prb_bandwidth_size
self.total_prb = total_prb
self.total_bitrate = total_bitrate #Mbps
self.allocated_prb = 0
self.allocated_bitrate = 0
self.antenna_power = antenna_power
self.antenna_gain = antenna_gain
self.feeder_loss = feeder_loss
self.bs_id = bs_id
self.carrier_frequency = carrier_frequency
self.fr = -1
if (carrier_frequency <= 6000): #below 6GHz
self.fr = 0
elif (carrier_frequency >= 24250 and carrier_frequency <= 52600): #between 24.25GHz and 52.6GHz
self.fr = 1
self.position = (position[0],position[1])
self.h_b = position[2]
self.number_subcarriers = number_subcarriers
self.env = env
self.numerology = numerology
self.ue_pb_allocation = {}
self.ue_bitrate_allocation = {}
self.T = 10
self.resource_utilization_array = [0] * self.T
self.resource_utilization_counter = 0
if(self.antenna_power < 5):
self.wardrop_alpha = 0.1
else:
self.wardrop_alpha = 0.2
def compute_rbur(self):
return sum(self.resource_utilization_array)/(self.T*self.total_prb)
def compute_nprb_NR(self, data_rate, rsrp):
#compute SINR
interference = 0
for elem in rsrp:
if elem != self.bs_id and util.find_bs_by_id(elem).bs_type != "sat" and util.find_bs_by_id(elem).carrier_frequency == self.carrier_frequency:
total, used = util.find_bs_by_id(elem).get_state()
interference = interference + (10 ** (rsrp[elem]/10))*(used/total)*(self.allocated_prb/self.total_prb)
#thermal noise is computed as k_b*T*delta_f, where k_b is the Boltzmann's constant, T is the temperature in kelvin and delta_f is the bandwidth
#thermal_noise = constants.Boltzmann*293.15*list(NRbandwidth_prb_lookup[self.numerology][self.fr].keys())[list(NRbandwidth_prb_lookup[self.numerology][self.fr].values()).index(self.total_prb / (10 * 2**self.numerology))]*1000000*(self.compute_rbur()+0.001)
thermal_noise = constants.Boltzmann*293.15*15*(2**self.numerology)*1000 # delta_F = 15*2^mu KHz each subcarrier since we are considering measurements at subcarrirer level (like RSRP)
sinr = (10**(rsrp[self.bs_id]/10))/(thermal_noise + interference)
r = self.prb_bandwidth_size*1000*math.log2(1+sinr) #bandwidth is in kHz
#based on the numerology choosen and considered the frame duration of 10ms, we transmit 1ms for mu = 0, 0.5ms for mu = 1, 0.25ms for mu = 2, 0.125ms for mu = 3 for each PRB each 10ms
#print(r)
r = r / (10 * (2**self.numerology))
#print(r)
N_prb = math.ceil(data_rate*1000000 / r) #data rate is in Mbps
return N_prb, r
def compute_sinr(self, rsrp):
interference = 0
for elem in rsrp:
if elem != self.bs_id and util.find_bs_by_id(elem).bs_type != "sat" and util.find_bs_by_id(elem).carrier_frequency != self.carrier_frequency:
interference = interference + (10 ** (rsrp[elem]/10))*util.find_bs_by_id(elem).compute_rbur()
#thermal noise is computed as k_b*T*delta_f, where k_b is the Boltzmann's constant, T is the temperature in kelvin and delta_f is the bandwidth
#thermal_noise = constants.Boltzmann*293.15*list(NRbandwidth_prb_lookup[self.numerology][self.fr].keys())[list(NRbandwidth_prb_lookup[self.numerology][self.fr].values()).index(self.total_prb / (10 * 2**self.numerology))]*1000000*(self.compute_rbur()+0.001)
thermal_noise = constants.Boltzmann*293.15*15*(2**self.numerology)*1000 # delta_F = 15*2^mu KHz each subcarrier since we are considering measurements at subcarrirer level (like RSRP)
sinr = (10**(rsrp[self.bs_id]/10))/(thermal_noise + interference)
return sinr
#this method will be called by an UE that tries to connect to this BS.
#the return value will be the actual bandwidth assigned to the user
def request_connection(self, ue_id, data_rate, rsrp):
N_prb, r = self.compute_nprb_NR(data_rate, rsrp)
old_N_prb = N_prb
#check if there is enough bitrate, if not then do not allocate the user
if self.total_bitrate - self.allocated_bitrate < r*N_prb/1000000:
dr = self.total_bitrate - self.allocated_bitrate
N_prb, r = self.compute_nprb_NR(dr, rsrp)
#check if there are enough PRBs
if self.total_prb - self.allocated_prb <= N_prb:
N_prb = self.total_prb - self.allocated_prb
if ue_id not in self.ue_pb_allocation:
self.ue_pb_allocation[ue_id] = N_prb
self.allocated_prb += N_prb
else:
self.allocated_prb -= self.ue_pb_allocation[ue_id]
self.ue_pb_allocation[ue_id] = N_prb
self.allocated_prb += N_prb
if ue_id not in self.ue_bitrate_allocation:
self.ue_bitrate_allocation[ue_id] = r * N_prb / 1000000
self.allocated_bitrate += r * N_prb / 1000000
else:
self.allocated_bitrate -= self.ue_bitrate_allocation[ue_id]
self.ue_bitrate_allocation[ue_id] = r * N_prb / 1000000
self.allocated_bitrate += r * N_prb / 1000000
#print("Allocated %s/%s NR PRB" %(N_prb, old_N_prb))
return r*N_prb/1000000 #we want a data rate in Mbps, not in bps
def request_disconnection(self, ue_id):
N_prb = self.ue_pb_allocation[ue_id]
self.allocated_prb -= N_prb
del self.ue_pb_allocation[ue_id]
def update_connection(self, ue_id, data_rate, rsrp):
N_prb, r = self.compute_nprb_NR(data_rate, rsrp)
#if (ue_id == 3 and self.bs_id == 2):
# print(N_prb, r)
diff = N_prb - self.ue_pb_allocation[ue_id]
#print("BS_ID", self.bs_id, "UE_ID: ", ue_id ," data_rate: ", data_rate," diff: ", diff, "ALREADY ALLOCATED: ", self.ue_pb_allocation[ue_id])
#print(N_prb*r/1000000)
#check before if there is enough bitrate
if diff >= 0 and self.total_bitrate > self.allocated_bitrate and self.total_bitrate - self.allocated_bitrate < diff * r / 1000000:
#print("BS_ID", self.bs_id, "UE_ID: ", ue_id ,"NO MORE BITRATE", self.total_bitrate - self.allocated_bitrate, diff * r / 1000000)
#return self.ue_pb_allocation[ue_id] * r / 1000000
dr = self.total_bitrate - self.allocated_bitrate
N_prb, r = self.compute_nprb_NR(self.ue_bitrate_allocation[ue_id]+dr, rsrp)
diff = N_prb - self.ue_pb_allocation[ue_id]
if self.total_prb - self.allocated_prb >= diff:
#there is the place for more PRB allocation (or less if diff is negative)
self.allocated_prb += diff
self.ue_pb_allocation[ue_id] += diff
self.allocated_bitrate += diff * r / 1000000
self.ue_bitrate_allocation[ue_id] += diff * r / 1000000
else:
#there is no room for more PRB allocation
diff = self.total_prb - self.allocated_prb
self.allocated_prb += diff
self.ue_pb_allocation[ue_id] += diff
self.allocated_bitrate += diff * r / 1000000
self.ue_bitrate_allocation[ue_id] += diff * r / 1000000
N_prb = self.ue_pb_allocation[ue_id]
return N_prb*r/1000000 #remember that we want the result in Mbps
#things to do before moving to the next timestep
def next_timestep(self):
#print(self.allocated_prb)
self.resource_utilization_array[self.resource_utilization_counter] = self.allocated_prb
self.resource_utilization_counter += 1
if self.resource_utilization_counter % self.T == 0:
self.resource_utilization_counter = 0
def new_state(self):
return (sum(self.resource_utilization_array) - self.resource_utilization_array[self.resource_utilization_counter] + self.allocated_prb)/(self.total_prb*self.T)
def get_state(self):
return self.total_prb, self.allocated_prb
def get_connection_info(self, ue_id):
return self.ue_pb_allocation[ue_id], self.total_prb
def get_connected_users(self):
return list(self.ue_pb_allocation.keys())
def reset(self):
self.resource_utilization_array = [0] * self.T
self.resource_utilization_counter = 0
def compute_latency(self, ue_id):
if ue_id in self.ue_pb_allocation:
return self.wardrop_alpha * self.ue_pb_allocation[ue_id]
#return self.wardrop_alpha * self.allocated_prb
return 0
def compute_r(self, ue_id, rsrp):
N_prb, r = self.compute_nprb_NR(1, rsrp)
return r