def get_Exh_Rate(self, state):
dist, ue_ang, rbd = (state*self.high_obs)
ue_pos = np.array(sph2cart(ue_ang, 0, dist)) # ue_pos is(x,y)
mimo_exh_model = MIMO(ue_pos, self.gNB[0], self.sc_xyz, self.ch_model, self.ptx, self.N_tx, self.N_rx)
#rbeam_vec = self.BeamSet#Generate_BeamDir(self.N)
exh_SNR = []
exh_rates = []
for rbeam in self.BeamSet:#rbeam_vec:
SNR, rate = mimo_exh_model.Calc_Rate(self.SF_time, np.array([rbeam, 0]))
exh_SNR.append(SNR)
exh_rates.append(rate)
best_rbeam_ndx = np.argmax(exh_rates)
return self.BeamSet[best_rbeam_ndx], np.max(exh_rates) #(Best RBS, Best Rate)
def get_Exh_Rate(self, state):
state = np.rint(state * self.high_obs)
ue_xloc, ue_yloc = state
ue_pos = np.array([ue_xloc, ue_yloc,0])
mimo_exh_model = MIMO(ue_pos, self.gNB[0], self.sc_xyz, self.ch_model, self.ptx, self.N_tx, self.N_rx)
#rbeam_vec = self.BeamSet#Generate_BeamDir(self.N)
exh_SNR = []
exh_rates = []
for rbeam in self.BeamSet:#rbeam_vec:
SNR, rate = mimo_exh_model.Calc_Rate(self.SF_time, np.array([rbeam, 0]))
#rate = 1e3 * rate
exh_SNR.append(SNR)
exh_rates.append(rate)
best_rbeam_ndx = np.argmax(exh_rates)
#print("[UAV_Env]: AOD: {}, AoA: {}, AoD-AoA: {}".format(mimo_exh_model.channel.az_aod[0], self.BeamSet[best_rbeam_ndx], -self.BeamSet[best_rbeam_ndx]+mimo_exh_model.channel.az_aod[0]))
return self.BeamSet[best_rbeam_ndx], np.max(exh_rates) #(Best RBS, Best Rate)
class RFBeamEnv:
#metadata = {'render.modes': ['human']}
def __init__(self, sc_xyz, ch_model):
self.N_tx = 1 # Num of transmitter antenna elements
self.N_rx = 8 # Num of receiver antenna elements
self.count = 0
self.ptx = 30 #dB
self.SF_time = 20 #msec - for 60KHz carrier frequency in 5G
self.alpha = 0
#self.level = 1
#self.state = None
# (x1,y1,z1) of UE_source location
self.ue_s = None#[10,15,0]
self.ue_v = None#10
#self.ue_tdist = 90
#self.cur_ue = None
#gNB locations One Serving gNB_1 node, 2 visible gnB_2,gNB_3 nodes
self.gNB = [[0,0,0], [20,30,0], [40,60,0]]
self.sc_xyz= sc_xyz
self.ch_model= ch_model
#Action space parameters: |A| = 8C4 x |delta_p| =70 x 5 = 350
#self.Actions = {
# 'K': 4, #Beam_set length
# 'N': 4, #Overall beam directions
# 'delta_p': [0,-1,+1,-2,+2] #position control space along x-direction
#}
#self.K = self.Actions['K'] #Beam_set length
#self.N = self.Actions['N'] #Overall beam directions
self.N = self.N_rx #Overall beam directions
#self.delta_p = self.Actions['delta_p'] #position control space along x-direction
self.BeamSet = Generate_BeamDir(self.N) #Set of all beam directions
#self.beta = math.pi/(2*(self.N-1)) # Beamwidth beta, 0 < beta <= (pi / (N - 1))
#State of the system - UE_t w.r.t gnB_1
#self.obs_space = [[x,self.ue_s[1],self.ue_s[2]] for x in range(self.ue_s[0],self.ue_s[0]+self.ue_tdist,self.ue_v)]
#Observation - RSSI information of states
self.obs = None
self.rate = None
self.goal_diff = None#None
#Action-Observation Mapping (Q_table)
#self.observation_values = Custom_Space_Mapping(self.Observations)
#self.rev_observation_values = dict((v[0], k) for k, v in self.observation_values.items())
#self.num_observations = len(self.observation_values.keys())
#self.min_state = self.observation_values[0][0] # minimum SNR state
#self.action_values = Custom_Space_Mapping(self.Actions)
#self.num_actions = len(self.action_values.keys())
#self.action_space = spaces.Discrete(self.num_actions) #I have to define this
#self.observation_space = spaces.Discrete(self.num_observations) #I can avoid this
# self.max_state = self.observation_values[self.num_observations-1][0]#maximum SNR state
self.rate_threshold = 0.7 # good enough QoS val (Rate)
#self.seed()
#self.viewer = None
def GenAction_Sample(self):
#delta_p = self.Actions['delta_p']
#rp_ndx = np.random.randint(0, len(delta_p))
#rdelta_p = delta_p[rp_ndx]
rk_beams = Gen_RandomBeams(1, self.N)
#rk_beams.append([rdelta_p])
#str_rk_beams = str(rk_beams)
#rk_beams = eval(str_rk_beams)
return rk_beams
'''
state, reward, done, {} - step(action)
- A basic function prototype of an Env class under gym
- This function is called every time, the env needs to be updated into a new state based on the applied action
Parameters:
action - the action tuple applied by the RL agent on Env current state
Output:
state - The new/update state of the environment
reward - Env reward to RL agent, for the given action
done - bool to check if the environment goal state is reached
{} - empty set
'''
def step(self, action):
# check the legal move first and then return its reward
# if action in self.actions[self.current_state]:
#assert self.action_space.contains(action), "%r (%s) invalid" % (action, type(action))
#rkbeam_vec, delta_p = action[:self.K], action[self.K][0]
#rkbeam_vec = action[:]
#tbeam_vec = [self.TB_r]
#changing only receiver beam based on the action
#prev_ue = self.cur_ue
#self.cur_ue[0] += self.ue_v + delta_p
#prev_obs = self.obs[:]
#prev_obs[0] += delta_p
self.ue_s[0] += self.ue_v #+ delta_p
self.obs[1] = np.array(action)
self.obs[0] = np.array(self.ue_s)
#self.TB_r = get_TBD(self.ue_s, self.alpha)
#RIM = self.Compute_RIM(prev_obs, kbeam_vec)
#rssi_gnb1 = RIM[:self.K]
#best_rssi_val = np.max(rssi_gnb1)
#print('[RF_Env] UE_S: ', self.ue_s)
self.mimo_model = MIMO(self.ue_s, self.gNB[0], self.sc_xyz, self.ch_model, self.ptx, self.N_tx, self.N_rx)
self.SNR, self.rate = self.mimo_model.Calc_Rate(self.SF_time, np.array([self.obs[1][0], 0]))#rkbeam_vec, tbeam_vec )
#print("[RF_Env] SNR: {0}, rate: {1}".format(20*np.log10(self.SNR), self.rate))
#self.mimo_los_model = MIMO(self.ue_s, self.gNB[0], self.ptx, self.N_tx, self.N_rx)
#print("[RF_Env] Los_SNR: {0}, Los_rate: {1}".format(20 * np.log10(self.Los_SNR), self.Los_rate))
#self.mimo_los_model = MIMO(self.obs, self.gNB[0], self.ptx, self.N_tx, self.N_rx)
#self.Los_SNR, self.LoS_rate = self.mimo_los_model.Los_Rate(SF_time, self.K)
#print("[RF_Env] pos_corr: {0}, Rate: {1}".format(delta_p,self.rate))
self.cum_rate += self.rate
#self.Los_rate = self.get_LoS_Rate(self.ue_s)
#self.cum_Los_rate += self.Los_rate
self.count += 1
rwd = self.Reward()
done = self.Game_Over()
#self.obs[0] += self.ue_v
#done = self.Game_Over()
#self.cur_ue = prev_ue
return self.obs, rwd, done
'''
game_state = game_over(s)
- Function to check if the agent has reached its goal in the environment
Parameters:
s - current state of the environment
Output:
game_state { False if s < goal_state
True if s = goal_state
'''
#Define the reward function here
def Reward(self):
#if rate <= prev_rate:#>= self.rate_threshold:
#if self.cum_rate >= (self.count*self.rate_threshold):
#los_rate = self.get_LoS_Rate(self.ue_s)
#done = self.Game_Over()
#if done and (self.cum_rate >= self.count*self.rate_threshold):
# return 1#self.rate
#else:
# return 0
#if self.rate >= self.rate_threshold:#done and (self.cum_rate >= self.count*self.rate_threshold):
# return 1
#elif self.rate < self.rate_threshold:
# return -1
#else:
# return 0 #-0.5
#if self.rate >= los_rate:
# return los_rate
#if self.cum_rate >= self.cum_Los_rate:
#if self.cum_rate >= (self.count*self.rate_threshold):
return self.rate
#else:
# return 0
def Game_Over(self):
#print("gameover: obs {0}, {1}".format(self.obs[0], self.ue_s[0] + self.ue_tdist))
#print("[Env] ue_s: {0}, goal: {1}".format(self.ue_s, self.goal))
#return (self.ue_s == self.goal)#(self.obs[0] == (self.ue_s[0]+self.ue_tdist))
return np.array_equal(self.ue_s, self.goal)
#self.cum_rate += self.rate
#self.cum_Los_rate += self.Los_rate
#return #np.around(self.Los_rate-self.rate, decimals=4) <= self.goal_diff)#np.round(self.cum_Los_rate/self.cum_rate) <= self.rate_ratio)
'''
reset()
- Resets the environment to its default values
- Prototype of the gym environment class
'''
def reset(self, ue, vel):
# Note: should be a uniform random value between starting 4-5 SNR states
#self.TB_r = get_TBD(ue, self.alpha)#Gen_RandomBeams(1, self.N)[0] # one random TX beam
self.RB_r = Gen_RandomBeams(1, self.N) # one random RX beam
# print(self.TB_r)
self.obs = [np.array(ue), self.RB_r]
self.ue_s = np.array(ue)
self.ue_v = vel
self.count = 0
self.rate = 0
self.cum_rate = 0
self.cum_Los_rate = 0
return np.array(self.obs)
def set_goal(self, ue_d):
self.goal = np.array(ue_d)
return
def set_velocity(self, vel):
self.ue_v = vel
return
def set_rate_threshold(self, rate_th):
self.rate_threshold = rate_th
return
def get_Rate(self):
return self.rate
def get_LoS_Rate(self, ue_s):
sc_xyz = np.array([])
ch_model = 'fsp'
mimo_model = MIMO(ue_s, self.gNB[0], sc_xyz, ch_model, self.ptx, self.N_tx, self.N_rx)
#print("[Env]: LoS h: {0}".format(mimo_model.channel.pathloss))
Los_SNR, Los_rate = mimo_model.Los_Rate()
return Los_rate
def get_Exh_Rate(self, ue_s):
#print("[RF_Env] obs: {0}".format(self.obs))
#print("[RF_Env] TB_r: {0}".format(self.TB_r))
self.mimo_exh_model = MIMO(ue_s, self.gNB[0], self.sc_xyz, self.ch_model, self.ptx, self.N_tx, self.N_rx)
#print("[Env]: exh h: {0}".format(self.mimo_exh_model.channel.pathloss))
rbeam_vec = Generate_BeamDir(self.N)
tbeam_vec = Generate_BeamDir(self.N)
exh_SNR = []
exh_rates=[]
for rbeam in rbeam_vec:
SNR, rate = self.mimo_exh_model.Calc_Rate(self.SF_time, np.array([rbeam[0], 0]))
exh_SNR.append(SNR)
exh_rates.append(rate)
best_rbeam_ndx = np.argmax(exh_rates)
return rbeam_vec[best_rbeam_ndx], np.max(exh_rates)
class UAV_Env_v2(gym.Env):
"""
Description:
A UAV moves in a region around the base station. The problem is to provide the UAV with best possible QoS over N steps
Observation:
Type: Box(3,)
Num Observation Min Max
0 distance (D) -100.0 100.0
1 TBD 0.0 3.14159
2 RBD 0.0 3.14159
Action:
Type:Discrete(Nrx)
Num Action
0 Bdir 0
1 Bdir 1
... ....
Nrx-1 Bdir {Nrx-1}
Reward:
Reward is rate value computed for every step taken, including the termination step. Rate value measured is [0.0, 4.0]
Starting State:
All observations are assigned a uniform random value in their respective Min Max range
Episode Termination:
When UAV makes N hops or N steps from the starting state
"""
def __init__(self):
self.N_tx = 1 # Num of transmitter antenna elements
self.N_rx = 8 # Num of receiver antenna elements
self.count = 0
self.ptx = 30 #dB
self.SF_time = 20 #msec - for 60KHz carrier frequency in 5G
self.alpha = 0
# (x1,y1,z1) of UE_source location
self.ue_s = None#[10,15,0]
#self.ue_v = None
self.gNB = np.array([[0,0,0]])#, [20,30,0], [40,60,0]]
self.sc_xyz= np.array([])
self.ch_model= 'fsp'
self.N = self.N_rx #Overall beam directions
self.BeamSet = Generate_BeamDir(self.N) #Set of all beam directions
#Observation - RSSI information of states
self.state = None
self.rate = None
self.rate_threshold = None # good enough QoS val (Rate)
self.Nhops = 5
#UE information
self.ue_step = 50
self.ue_xloc = np.arange(-500, 550, 50) #10 locs
#self.ue_xloc = np.delete(self.ue_xloc, np.argwhere(self.ue_xloc == 0)) #remove (0,0) from ue_xloc
self.ue_yloc = np.arange(50,550, 50) #5 locs
#self.ue_yloc = np.delete(self.ue_yloc, np.argwhere(self.ue_yloc == 0)) # remove (0,0) from ue_xloc
self.ue_vx = np.array([50,100]) #3 speed parameters
self.ue_vy = np.array([50,100]) #3 speed parameters
self.ue_xdest = np.array([np.min(self.ue_xloc)]) # 1 x-dest loc np.min(self.ue_xloc)
self.ue_ydest = np.array([np.min(self.ue_yloc)]) # 1 y-dest loc
self.ue_xsrc = np.array([np.max(self.ue_xloc)]) # 1 source x-loc
self.ue_ysrc = np.array([np.max(self.ue_yloc)]) # 1 source y-loc
self.ue_moves = np.array(['L', 'R', 'U', 'D']) # moving direction of UAV
self.seed()
#low_obs = np.array([-500, 0, 0.0, 10.0, 10.0])
self.high_obs = np.array([np.max(self.ue_xloc), np.max(self.ue_yloc)])
self.obs_space = spaces.MultiDiscrete([len(self.ue_xloc), #ue_xloc
len(self.ue_yloc), #ue_yloc
])
self.act_space = spaces.Discrete(self.N*len(self.ue_moves)) #n(RBD)*n(ue_xvel)*n(ue_yvel)
def seed(self, seed=None):
self.np_random, seed = seeding.np_random(seed)
return [seed]
def step(self, action):
assert self.act_space.contains(action), "%r (%s) invalid" % (action, type(action))
state = np.rint(self.state * self.high_obs)
rbd_ndx, ue_mv_ndx = self.decode_action(action)
ue_vx, ue_vy = self.choose_vel(ue_mv_ndx)
rbs = self.BeamSet[rbd_ndx]
ue_xdest = self.ue_xdest[0]
ue_ydest = self.ue_ydest[0]
ue_xloc, ue_yloc = state
ue_mv = self.ue_moves[ue_mv_ndx]
if ue_mv == 'L':
new_ue_xloc = max(ue_xloc + ue_vx, np.min(self.ue_xloc))
new_ue_yloc = ue_yloc + ue_vy
if ue_mv == 'U':
new_ue_xloc = ue_xloc + ue_vx
new_ue_yloc = min(ue_yloc + ue_vy, np.max(self.ue_yloc))
if ue_mv == 'R':
new_ue_xloc = min(ue_xloc + ue_vx, np.max(self.ue_xloc))
new_ue_yloc = ue_yloc + ue_vy
if ue_mv == 'D':
new_ue_xloc = ue_xloc + ue_vx
new_ue_yloc = max(ue_yloc + ue_vy, np.min(self.ue_yloc))
new_ue_pos = np.array([new_ue_xloc, new_ue_yloc, 0])
self.mimo_model = MIMO(new_ue_pos, self.gNB[0], self.sc_xyz, self.ch_model, self.ptx, self.N_tx, self.N_rx)
self.SNR, self.rate = self.mimo_model.Calc_Rate(self.SF_time, np.array([rbs, 0])) # rkbeam_vec, tbeam_vec )
self.cur_rate = self.rate
self.cur_dist = np.sqrt((ue_xloc-ue_xdest)**2 + (ue_yloc-ue_ydest)**2) #x**2 + y**2
self.state = np.array([new_ue_xloc, new_ue_yloc]) / self.high_obs
rwd, done = self._gameover(rbs, self.mimo_model.az_aod)
#self.rate = 1e3*self.rate
new_ue_xndx = np.where(self.ue_xloc ==new_ue_xloc)[0][0]
new_ue_yndx = np.where(self.ue_yloc == new_ue_yloc)[0][0]
self.ue_path_rates.append(self.rate)
#self.ue_path_rates.append(self.rate)
self.ue_path.append(np.array([new_ue_xloc, new_ue_yloc]))
self.steps_done += 1
#rwd = self._reward(prev_dist)
#print("[uav_env] rwd: {}".format(rwd))
return self.state, rwd, done, {}
def reset(self, rate_thr):
# Note: should be a uniform random value between starting 4-5 SNR states
#self.TB_r = get_TBD(ue, self.alpha)#Gen_RandomBeams(1, self.N)[0] # one random TX beam
#state_indices = self.obs_space.sample()
xloc_ndx, yloc_ndx = self.obs_space.sample()
#Start from a fixed start location
self.state = np.array([self.ue_xloc[xloc_ndx],
self.ue_yloc[yloc_ndx]
])
#self.state = np.array([self.ue_xsrc[0],
# self.ue_ysrc[0]
# ])
self.steps_done = 0
self.rate = 0.0
self.cur_dist = np.Inf
self.cur_rate = 0.0
self.ue_path = []
self.ue_path.append(self.state)
self.ue_xsrc = self.state[0]
self.ue_ysrc = self.state[1]
self.ue_path_rates = []
#self.ue_path_rates = []
#Computing the rate threshold for the given destination
#ue_dest = np.array([self.ue_xloc[xloc_ndx], self.ue_yloc[yloc_ndx], 0])
#dest_mimo_model = MIMO(ue_dest, self.gNB[0], self.sc_xyz, self.ch_model, self.ptx, self.N_tx, self.N_rx)
#dest_SNR = []
#dest_rates = []
#for rbeam in self.BeamSet: # rbeam_vec:
# SNR, rate = dest_mimo_model.Calc_Rate(self.SF_time, np.array([rbeam, 0]))
# dest_SNR.append(SNR)
# dest_rates.append(rate)
self.rate_threshold = rate_thr #np.max(dest_rates)
self.state = self.state / self.high_obs
#self.state = self.state.reshape((1, len(self.state)))
return self.state
def render(self, mode='human', close=False):
#fig, ax = plt.subplots(1, 1, figsize=(10, 10))
#x_axis = [x[0] for x in self.ue_path]
#y_axis = [x[1] for x in self.ue_path]
#z_axis = self.ue_path_rates
#plt.plot(x_axis, y_axis)
#plt.show()
from matplotlib.path import Path
import matplotlib.patches as patches
verts = [(int(x[0]),int(x[1])) for x in self.ue_path]
#print(self.ue_path)
#print(verts)
codes = [Path.LINETO for x in range(len(verts))]
codes[0] = Path.MOVETO
codes[-1] = Path.STOP
path = Path(verts, codes)
fig = plt.figure(figsize=(10,10))
ax = fig.add_subplot(111)
patch = patches.PathPatch(path, facecolor='none', lw=2)
ax.add_patch(patch)
xs, ys = zip(*verts)
ax.plot(xs, ys, 'x--', lw=2, color='black')
#xdisplay, ydisplay = ax.transData.transform_point((self.ue_xsrc, self.ue_ysrc))
bbox = dict(boxstyle="round", fc="0.8")
arrowprops = dict(
arrowstyle="->",
connectionstyle="angle,angleA=0,angleB=90,rad=10")
offset = 40
ax.annotate('Src = (%d, %d)' % (self.ue_xsrc, self.ue_ysrc),
(self.ue_xsrc, self.ue_ysrc), xytext=(-2 * offset, offset), textcoords='offset points',
bbox=bbox, arrowprops=arrowprops)
ax.annotate('Dest = (%d, %d)' % (self.ue_xdest[0], self.ue_ydest[0]),
(self.ue_xdest[0], self.ue_ydest[0]), xytext=(0.5 * offset, -offset),
textcoords='offset points',
bbox=bbox, arrowprops=arrowprops)
offset= 10
bbox =dict(boxstyle="round", facecolor='yellow', edgecolor='none')
for i in range(0,len(self.ue_path_rates)):
ax.annotate('%.2f' % np.around(self.ue_path_rates[i], decimals=2),
(verts[i+1][0], verts[i+1][1]), xytext=(-2 * offset, offset), textcoords='offset points',
bbox=bbox, arrowprops=arrowprops)
ax.grid()
ax.set_xticks(self.ue_xloc)
ax.set_yticks(self.ue_yloc)
ax.set_title("UAV graph w.r.t gNB [0,0,0]")
ax.set_xlabel("X direction")
ax.set_ylabel("Y direction")
plt.show()
return
#Not using this function
def _reward(self, prev_dist):
#bf_condn = False
#if ((prev_rate >= self.rate) and (prev_dist <= cur_dist)) or ((prev_rate <= self.rate) and (prev_dist >= cur_dist)):
# bf_condn = True
#if (self.rate > self.rate_threshold) and (bf_condn is True):
# return 10*(self.rate-self.rate_threshold)+8#10+ self.rate-self.rate_threshold-1
#elif (self.rate > self.rate_threshold) and (bf_condn is False):
# return 3
#else:
# return -3
ue_dist = np.sqrt((self.state[0]-self.ue_xdest) ** 2 + (self.state[1]-self.ue_ydest) ** 2)
#ue_dest_dist = np.sqrt(self.state[0][-2]**2 + self.state[0][-1]**2)
if (self.rate >= self.rate_threshold) and (ue_dist <= prev_dist):
return 10*self.rate + 3
else:
return 0.0#10*self.rate - 3
def dest_check(self):
reached = False
state = np.rint(self.state * self.high_obs)
next_dist = np.sqrt((state[0] - self.ue_xdest[0]) ** 2 + (state[1] - self.ue_ydest[0]) ** 2)
if next_dist < 50:
reached = True
return reached
def _gameover(self, aoa, aod): #prev_dist, curr_rate):
#ue_dist = np.sqrt(self.state[0][0]**2 + self.state[0][1]**2)
#ue_dest_dist = np.sqrt(self.state[0][-2]**2 + self.state[0][-1]**2)
#return ue_dist >= ue_dest_dist
state = np.rint(self.state * self.high_obs)
next_dist = np.sqrt((state[0] - self.ue_xdest[0]) ** 2 + (state[1] - self.ue_ydest[0]) ** 2)
ang_1 = 3.14 - np.around(np.pi/self.N,decimals=2)
ang_2 = 3.14 + np.around(np.pi/self.N,decimals=2)
ang_3 = 0#2*3.14 - np.around(np.pi/self.N,decimals=2)
ang_4 = np.around(np.pi/self.N,decimals=2)#2*3.14
#if (next_dist < 50) and (ang_1 < np.around(aod-aoa, decimals=2) < ang_2):
#elif (next_dist < 50) and (ang_3 < np.around(aod-aoa, decimals=2) < ang_4):
# rwd = 2.0#3.1#2.1#self.rate + 2.0#2000.0
# done = True
#elif (ang_1 < np.around(aod-aoa, decimals=2) < ang_2): #(ang_1 < np.around(aod-aoa, decimals=2) < ang_2) and
if (self.dest_check()) and (self.rate >= self.rate_threshold):
rwd = 1.0#3.1#2.1#self.rate + 2.0#2000.0
done = True
elif self.dest_check():
rwd = -1.0
done = True
elif (self.rate >= self.rate_threshold):
rwd = 1.0*np.exp(-1*(self.steps_done-1)/50) *np.log10(self.rate+1)# np.exp(self.rate/50)#1.0#self.rate+1.0#self.rate + 2.0 #10*np.log10(val+1) + 2.0
done = False
#elif (ang_3 < np.around(aod-aoa, decimals=2) < ang_4): #(self.rate >= self.rate_threshold) and
# rwd = 1.0 * np.exp(-1 * (self.steps_done - 1) / 10) # 1.0#self.rate+1.0#self.rate + 2.0 #10*np.log10(val+1) + 2.0
# done = False
else:
rwd = -1.0#-self.rate-1.0#-self.rate -2.0#-20.0
done = False
self.aoa = aoa
self.aod = aod
return rwd, done
def decode_action(self, action_ndx):
#ue_vy_ndx = action_ndx % len(self.ue_vy)
#action_ndx = action_ndx // len(self.ue_vy)
#ue_v_ndx = action_ndx % len(self.ue_vx)
#action_ndx = action_ndx // len(self.ue_vx)
ue_mv_ndx = action_ndx % len(self.ue_moves)
action_ndx = action_ndx // len(self.ue_moves)
beam_ndx = action_ndx % self.N
action_ndx = action_ndx // self.N
assert 0<= action_ndx <= self.act_space.n
return (beam_ndx, ue_mv_ndx)
#Not using this function
def encode_action(self, beam_ndx, ue_vx_ndx, ue_vy_ndx):
i = beam_ndx
i*= self.N
i += ue_vx_ndx
i*=len(self.ue_vx)
i += ue_vy_ndx
i*= len(self.ue_vy)
return i
def choose_vel(self, ue_mv_ndx):
ue_mv = self.ue_moves[ue_mv_ndx]
if ue_mv == 'L': #move left
ue_vx = -1 * self.ue_vx[0]
ue_vy = 0
elif ue_mv == 'U': #move up
ue_vx = 0
ue_vy = self.ue_vy[0]
elif ue_mv == 'D': #move down
ue_vx = 0
ue_vy = -1*self.ue_vy[0]
else: #move right
ue_vx = self.ue_vx[0]
ue_vy = 0
return ue_vx, ue_vy
def get_Los_Rate(self, state):
state = np.rint(state * self.high_obs)
ue_xloc, ue_yloc = state
sc_xyz = np.array([])
ch_model = 'fsp'
ue_pos = np.array([ue_xloc, ue_yloc, 0])
mimo_model = MIMO(ue_pos, self.gNB[0], sc_xyz, ch_model, self.ptx, self.N_tx, self.N_rx)
SNR, rate = mimo_model.Los_Rate() # rkbeam_vec, tbeam_vec )
#rate = 1e3 * rate
return SNR, rate
def get_Exh_Rate(self, state):
state = np.rint(state * self.high_obs)
ue_xloc, ue_yloc = state
ue_pos = np.array([ue_xloc, ue_yloc,0])
mimo_exh_model = MIMO(ue_pos, self.gNB[0], self.sc_xyz, self.ch_model, self.ptx, self.N_tx, self.N_rx)
#rbeam_vec = self.BeamSet#Generate_BeamDir(self.N)
exh_SNR = []
exh_rates = []
for rbeam in self.BeamSet:#rbeam_vec:
SNR, rate = mimo_exh_model.Calc_Rate(self.SF_time, np.array([rbeam, 0]))
#rate = 1e3 * rate
exh_SNR.append(SNR)
exh_rates.append(rate)
best_rbeam_ndx = np.argmax(exh_rates)
#print("[UAV_Env]: AOD: {}, AoA: {}, AoD-AoA: {}".format(mimo_exh_model.channel.az_aod[0], self.BeamSet[best_rbeam_ndx], -self.BeamSet[best_rbeam_ndx]+mimo_exh_model.channel.az_aod[0]))
return self.BeamSet[best_rbeam_ndx], np.max(exh_rates) #(Best RBS, Best Rate)
def get_Rate(self):
return self.rate
class UAV_Env(gym.Env):
"""
Description:
A UAV moves in a region around the base station. The problem is to provide the UAV with best possible QoS over N steps
Observation:
Type: Box(3,)
Num Observation Min Max
0 distance (D) -100.0 100.0
1 TBD 0.0 3.14159
2 RBD 0.0 3.14159
Action:
Type:Discrete(Nrx)
Num Action
0 Bdir 0
1 Bdir 1
... ....
Nrx-1 Bdir {Nrx-1}
Reward:
Reward is rate value computed for every step taken, including the termination step. Rate value measured is [0.0, 4.0]
Starting State:
All observations are assigned a uniform random value in their respective Min Max range
Episode Termination:
When UAV makes N hops or N steps from the starting state
"""
def __init__(self):
self.N_tx = 1 # Num of transmitter antenna elements
self.N_rx = 8 # Num of receiver antenna elements
self.count = 0
self.ptx = 30 #dB
self.SF_time = 20 #msec - for 60KHz carrier frequency in 5G
self.alpha = 0
# (x1,y1,z1) of UE_source location
self.ue_s = None#[10,15,0]
self.ue_v = 10
self.gNB = np.array([[0,0,0]])#, [20,30,0], [40,60,0]]
self.sc_xyz= np.array([])
self.ch_model= 'fsp'
self.N = self.N_rx #Overall beam directions
self.BeamSet = Generate_BeamDir(self.N) #Set of all beam directions
#Observation - RSSI information of states
self.state = None
self.rate = None
self.rate_threshold = 0.07 # good enough QoS val (Rate)
self.Nhops = 5
self.seed()
low_obs = np.array([30.0, 0.0, 0.0])
self.high_obs = np.array([100.0, 3.14159, 3.14159])
self.obs_space = spaces.Box(low=low_obs,high=self.high_obs)
self.act_space = spaces.Discrete(self.N)
def seed(self, seed=None):
self.np_random, seed = seeding.np_random(seed)
return [seed]
def step(self, action):
assert self.act_space.contains(action), "%r (%s) invalid" % (action, type(action))
state = self.state * self.high_obs
dist, ue_ang, rbd = state
rbs = self.BeamSet[action]
ue_pos = np.array(sph2cart(ue_ang, 0, dist)) #ue_pos is(x,y)
ue_pos[0] += self.ue_v
new_dist = np.sqrt(ue_pos[0]**2 + ue_pos[1]**2) #x**2 + y**2
new_ang = np.arctan2(ue_pos[1],ue_pos[0])
self.state = np.array([new_dist, new_ang, rbs]) / self.high_obs
self.mimo_model = MIMO(ue_pos, self.gNB[0], self.sc_xyz, self.ch_model, self.ptx, self.N_tx, self.N_rx)
prev_rate = self.rate
prev_dist = dist
self.SNR, self.rate = self.mimo_model.Calc_Rate(self.SF_time, np.array([rbs, 0]))#rkbeam_vec, tbeam_vec )
self.steps_done += 1
rwd = self._reward(prev_rate, prev_dist, new_dist)
#print("[uav_env] rwd: {}".format(rwd))
done = self._gameover()
return self.state, rwd, done, {}
def reset(self):
# Note: should be a uniform random value between starting 4-5 SNR states
#self.TB_r = get_TBD(ue, self.alpha)#Gen_RandomBeams(1, self.N)[0] # one random TX beam
dist = np.random.uniform(low=30.0, high=50.0)#self.np_random.uniform(low=30.0, high=50.0)
TBD = np.random.uniform(low=0.0, high=3.14159)#self.np_random.uniform(low=0.0, high=3.14159)
RBD = Gen_RandomBeams(1, self.N) # one random RX beam
self.state = np.array([dist, TBD, RBD]) / self.high_obs
self.steps_done = 0
self.rate = 0
return np.array(self.state)
def render(self, mode='human', close=False):
pass
def _reward(self, prev_rate, prev_dist, cur_dist):
#bf_condn = False
#if ((prev_rate >= self.rate) and (prev_dist <= cur_dist)) or ((prev_rate <= self.rate) and (prev_dist >= cur_dist)):
# bf_condn = True
#if (self.rate > self.rate_threshold) and (bf_condn is True):
# return 10*(self.rate-self.rate_threshold)+8#10+ self.rate-self.rate_threshold-1
#elif (self.rate > self.rate_threshold) and (bf_condn is False):
# return 3
#else:
# return -3
#(az_aod, temp, temp) = cart2sph(rx[0] - tx[0], rx[1] - tx[1], rx[2] - tx[2])
#if az_aod == rb_ang:
# return 1
#else:
# return 0
#val = np.abs(az_aod-rb_ang)
#print("[uav_env] val: {}, az_aod: {}, rbs: {}", val, az_aod, rb_ang)
#if (val >= (np.pi)):
# return 1+ np.log10((2*val/(np.pi))-1) #1+log10(2x/pi -1)
#else:
# return 0
if(self.rate > self.rate_threshold):
return 10*self.rate +3 #np.exp(self.rate-self.rate_threshold-1)
else:
return 0#10*self.rate -3
def _gameover(self):
return (self.steps_done == self.Nhops)
def get_Los_Rate(self, state):
dist, ue_ang, rbd = (state * self.high_obs)
ue_pos = np.array(sph2cart(ue_ang, 0, dist)) # ue_pos is(x,y)
sc_xyz = np.array([])
ch_model = 'fsp'
mimo_model = MIMO(ue_pos, self.gNB[0], sc_xyz, ch_model, self.ptx, self.N_tx, self.N_rx)
SNR, rate = mimo_model.Los_Rate() # rkbeam_vec, tbeam_vec )
return SNR, rate
def get_Exh_Rate(self, state):
dist, ue_ang, rbd = (state*self.high_obs)
ue_pos = np.array(sph2cart(ue_ang, 0, dist)) # ue_pos is(x,y)
mimo_exh_model = MIMO(ue_pos, self.gNB[0], self.sc_xyz, self.ch_model, self.ptx, self.N_tx, self.N_rx)
#rbeam_vec = self.BeamSet#Generate_BeamDir(self.N)
exh_SNR = []
exh_rates = []
for rbeam in self.BeamSet:#rbeam_vec:
SNR, rate = mimo_exh_model.Calc_Rate(self.SF_time, np.array([rbeam, 0]))
exh_SNR.append(SNR)
exh_rates.append(rate)
best_rbeam_ndx = np.argmax(exh_rates)
return self.BeamSet[best_rbeam_ndx], np.max(exh_rates) #(Best RBS, Best Rate)
def get_Rate(self):
return self.rate
class UAV_Env_v3(gym.Env):
"""
Description:
A UAV moves in a region within the coverage area of the base station.
The objective of the problem is to guide UAV (using gNB)in a rate requirement path,
reaching the destination in an energy minimized way as early as possible
Observation:
Type: MultiDiscrete(2,)
Num Observation Min Max Step
1 UAV_xloc -500.0 500.0 50.0
2 UAV_yloc -500.0 500.0 50.0
Action:
Type:Discrete(Nrx*num(uav_moves))
Num Action
0 Bdir0, mov0
1 Bdir0, mov1
2 Bdir0, mov2
3 Bdir0, mov3
4 Bdir 1, ...
... ....
(Nrx-1)*uav_moves Bdir{Nrx-1}, mov3
Reward:
Reward is value computed based on rate measurements and energy minimization conditions. Range [-1.0, 1.0]
Starting State:
Obs_space.sample() - Any random location with the Observation range
Episode Termination:
When UAV reaches the defined destination D
"""
def __init__(self):
#Antenna Modelling
#Uniform Linear Arrays (ULA) antenna modelling is considered
self.N_tx = 8 # Num of transmitter antenna elements
self.N_rx = 8 # Num of receiver antenna elements
self.count = 0
self.ptx = 30 #dB
self.SF_time = 20 #msec - for 60KHz carrier frequency in 5G
self.alpha = 0
#Base Statin Locations
self.gNB = np.array([[0, 0, 0]]) #, [20,30,0], [40,60,0]]
#Channel
self.sc_xyz = np.array([])
self.ch_model = 'uma-los'
self.N = self.N_rx #Overall beam directions
self.BeamSet = Generate_BeamDir(self.N) #Set of all beam directions
#Observation - RSSI information of states
self.state = None
self.rate = None
self.rate_threshold = None # good enough QoS val (Rate)
#UE information
self.ue_step = 50
self.ue_xloc = np.arange(-500, 550, self.ue_step) #10 locs
#self.ue_xloc = np.delete(self.ue_xloc, np.argwhere(self.ue_xloc == 0)) #remove (0,0) from ue_xloc
self.ue_yloc = np.arange(-500, 550, self.ue_step) #5 locs
#self.ue_yloc = np.delete(self.ue_yloc, np.argwhere(self.ue_yloc == 0)) # remove (0,0) from ue_xloc
self.ue_vx = np.array([50, 100]) #3 speed parameters
self.ue_vy = np.array([50, 100]) #3 speed parameters
self.ue_xdest = np.array([np.min(self.ue_xloc)
]) # 1 x-dest loc np.min(self.ue_xloc)
self.ue_ydest = np.array([400]) # 1 y-dest loc
self.ue_xsrc = np.array([np.max(self.ue_xloc)]) # 1 source x-loc
self.ue_ysrc = np.array([np.max(self.ue_yloc)]) # 1 source y-loc
self.ue_moves = np.array(['L', 'R', 'U',
'D']) # moving direction of UAV
self.seed()
#Observation and Action Spaces
#low_obs = np.array([-500, 0, 0.0, 10.0, 10.0])
self.high_obs = np.array([np.max(self.ue_xloc), np.max(self.ue_yloc)])
self.obs_space = spaces.MultiDiscrete([
len(self.ue_xloc), #ue_xloc
len(self.ue_yloc), #ue_yloc
])
self.act_space = spaces.Discrete(
self.N * len(self.ue_moves)) #n(RBD)*n(ue_moves)
def seed(self, seed=None):
self.np_random, seed = seeding.np_random(seed)
return [seed]
def step(self, action):
assert self.act_space.contains(
action), "%r (%s) invalid" % (action, type(action))
state = np.rint(self.state * self.high_obs)
rbd_ndx, ue_mv_ndx = self.decode_action(action)
ue_vx, ue_vy = self.choose_vel(ue_mv_ndx)
rbs = self.BeamSet[rbd_ndx]
ue_xdest = self.ue_xdest[0]
ue_ydest = self.ue_ydest[0]
ue_xloc, ue_yloc = state
self.cur_dist = np.sqrt(
(ue_xloc - ue_xdest)**2 + (ue_yloc - ue_ydest)**2) # x**2 + y**2
self.cur_state = state
if self.done: #reached terminal state
return self.state, self.rwd, self.done, {}
ue_mv = self.ue_moves[ue_mv_ndx]
if ue_mv == 'L':
new_ue_xloc = max(ue_xloc + ue_vx, np.min(self.ue_xloc))
new_ue_yloc = ue_yloc + ue_vy
if ue_mv == 'U':
new_ue_xloc = ue_xloc + ue_vx
new_ue_yloc = min(ue_yloc + ue_vy, np.max(self.ue_yloc))
if ue_mv == 'R':
new_ue_xloc = min(ue_xloc + ue_vx, np.max(self.ue_xloc))
new_ue_yloc = ue_yloc + ue_vy
if ue_mv == 'D':
new_ue_xloc = ue_xloc + ue_vx
new_ue_yloc = max(ue_yloc + ue_vy, np.min(self.ue_yloc))
new_ue_pos = np.array([new_ue_xloc, new_ue_yloc, 0])
#Approximating (0,0) to (20,20) location to prevent rate->Inf
if (new_ue_xloc == 0) and (new_ue_yloc == 0):
self.mimo_model = MIMO(np.array([40, 40, 0]), self.gNB[0],
self.sc_xyz, self.ch_model, self.ptx,
self.N_tx, self.N_rx)
self.SNR, self.rate = self.mimo_model.Calc_Rate(
self.SF_time, np.array([rbs, 0])) # rkbeam_vec, tbeam_vec )
else:
self.mimo_model = MIMO(new_ue_pos, self.gNB[0], self.sc_xyz,
self.ch_model, self.ptx, self.N_tx,
self.N_rx)
self.SNR, self.rate = self.mimo_model.Calc_Rate(
self.SF_time, np.array([rbs, 0])) # rkbeam_vec, tbeam_vec )
if self.measure == 'rate_thr_path':
self.rwd, self.done = self._gameover()
elif self.measure == 'rate_path':
self.rwd, self.done = self.rate_path_gameover()
elif self.measure == 'short_path':
self.rwd, self.done = self.short_path_gameover()
else:
print("Err: Incorrect measure str\n")
self.rwd, self.done = -100.0, True
self.ue_path_rates.append(self.rate)
self.ue_path.append(np.array([new_ue_xloc, new_ue_yloc]))
self.cur_rate = self.rate
self.prev_dist = self.cur_dist
self.state = np.array([new_ue_xloc, new_ue_yloc]) / self.high_obs
self.steps_done += 1
return self.state, self.rwd, self.done, {}
def beyond_border(self, ue_xpos, ue_ypos):
if (ue_xpos == np.min(self.ue_xloc)) or (ue_xpos == np.max(
self.ue_xloc)) or (ue_ypos == np.min(
self.ue_yloc)) or (ue_ypos == np.max(self.ue_yloc)):
return True
else:
return False
def reset(self, rate_thr, meas, state_indices):
#state_indices = self.obs_space.sample()
#xloc_ndx, yloc_ndx = self.obs_space.sample()
xloc_ndx, yloc_ndx = state_indices
#Start from a random start location
self.state = np.array([self.ue_xloc[xloc_ndx], self.ue_yloc[yloc_ndx]])
#self.state = np.array([self.ue_xsrc[0],
# self.ue_ysrc[0]
# ])
self.steps_done = 0
self.rate = 0.0
self.ue_path = []
#self.ue_path.append(self.state)
self.ue_xsrc = self.state[0]
self.ue_ysrc = self.state[1]
self.ue_path_rates = []
self.measure = meas
self.rwd = 0.0
self.done = False
#self.ue_path_rates = []
self.rate_threshold = rate_thr #np.max(dest_rates)
self.state = self.state / self.high_obs
self.prev_dist = np.Inf
#_, self.cur_rate = self.get_Exh_Rate(self.state)
self.cur_rate = 0.0
#self.state = self.state.reshape((1, len(self.state)))
return self.state
def render(self, mode='human', close=False):
#fig, ax = plt.subplots(1, 1, figsize=(10, 10))
#x_axis = [x[0] for x in self.ue_path]
#y_axis = [x[1] for x in self.ue_path]
#z_axis = self.ue_path_rates
#plt.plot(x_axis, y_axis)
#plt.show()
from matplotlib.path import Path
import matplotlib.patches as patches
verts = [(int(x[0]), int(x[1])) for x in self.ue_path]
#print(self.ue_path)
#print(verts)
codes = [Path.LINETO for x in range(len(verts))]
codes[0] = Path.MOVETO
codes[-1] = Path.STOP
path = Path(verts, codes)
fig = plt.figure(figsize=(10, 10))
ax = fig.add_subplot(111)
patch = patches.PathPatch(path, facecolor='none', lw=2)
ax.add_patch(patch)
xs, ys = zip(*verts)
ax.plot(xs, ys, 'x--', lw=2, color='black')
#xdisplay, ydisplay = ax.transData.transform_point((self.ue_xsrc, self.ue_ysrc))
bbox = dict(boxstyle="round", fc="0.8")
arrowprops = dict(arrowstyle="->",
connectionstyle="angle,angleA=0,angleB=90,rad=10")
offset = 40
ax.annotate('Src = (%d, %d)' % (self.ue_xsrc, self.ue_ysrc),
(self.ue_xsrc, self.ue_ysrc),
xytext=(-2 * offset, offset),
textcoords='offset points',
bbox=bbox,
arrowprops=arrowprops)
ax.annotate('Dest = (%d, %d)' % (self.ue_xdest[0], self.ue_ydest[0]),
(self.ue_xdest[0], self.ue_ydest[0]),
xytext=(0.5 * offset, -offset),
textcoords='offset points',
bbox=bbox,
arrowprops=arrowprops)
offset = 10
bbox = dict(boxstyle="round", facecolor='yellow', edgecolor='none')
for i in range(0, len(self.ue_path_rates)):
ax.annotate('%.2f' % np.around(self.ue_path_rates[i], decimals=2),
(verts[i][0], verts[i][1]),
xytext=(-2 * offset, offset),
textcoords='offset points',
bbox=bbox,
arrowprops=arrowprops)
ax.grid()
ax.set_xticks(self.ue_xloc)
ax.set_yticks(self.ue_yloc)
ax.set_title("UAV graph w.r.t gNB [0,0,0]")
ax.set_xlabel("X direction")
ax.set_ylabel("Y direction")
plt.show()
return
def dest_check(self):
reached = False
#state = self.cur_state#np.rint(self.cur_state * self.high_obs)
#curr_dist = np.sqrt((state[0] - self.ue_xdest[0]) ** 2 + (state[1] - self.ue_ydest[0]) ** 2)
if self.cur_dist < self.ue_step:
reached = True
return reached
def _gameover(self):
#state = np.rint(self.state * self.high_obs)
#curr_dist = np.sqrt((state[0] - self.ue_xdest[0]) ** 2 + (state[1] - self.ue_ydest[0]) ** 2)
#if (self.dest_check()) and (self.rate >= self.rate_threshold):
# rwd = 1.0#3.1#2.1#self.rate + 2.0#2000.0
# done = True
if self.dest_check():
rwd = 1.0 * np.log10(
8 * self.rate +
1) #*np.log10(self.rate + 1) #*np.exp(-self.steps_done/100)
done = True
elif (self.cur_rate >=
self.rate_threshold): #and (self.cur_dist < self.prev_dist):
#rwd = 1.0*np.exp(-1*(self.steps_done-1)/50)*np.log10(max(21-self.rate,0)+1)#*np.exp(self.rate/10)/20#np.log10(max(21.5-self.rate, 0)+1)/3#*np.log10(self.rate+1)# np.exp(self.rate/50)#1.0#self.rate+1.0#self.rate + 2.0 #10*np.log10(val+1) + 2.0
rwd = 0.6 * np.exp(
-self.cur_dist / 1000
) * np.exp(-2 * (self.steps_done - 1) / 50) * np.log10(
8 * self.rate + 1
) #*np.exp(-2*(self.steps_done-1)/50)#*np.log10(self.rate + 1)#*np.exp(self.rate/20)#*min(np.exp(self.rate/20), np.exp((self.rate_threshold-self.rate)/20.0))#0.5 * np.exp(-1 * (self.steps_done - 1) / 50) *(1-self.rate/30)
#print(rwd)
done = False
elif (self.cur_dist < self.prev_dist):
rwd = 0.8 * np.exp(-self.cur_dist / 1000) * np.exp(
-2 * (self.steps_done - 1) / 50) * np.log10(
8 * self.rate + 1
) #*np.exp(-self.rate/20)#-self.rate-1.0#-self.rate -2.0#-20.0
done = False
elif (self.cur_dist >
self.prev_dist): #self.cur_rate >= self.rate_threshold) and
rwd = 0.2 * np.exp(
-self.cur_dist / 1000
) * np.exp(-2 * (self.steps_done - 1) / 50) * np.log10(
8 * self.rate + 1
) #*np.log10(self.rate + 1)#*np.exp(self.rate/20)#*min(np.exp(self.rate/20), np.exp((self.rate_threshold-self.rate)/20.0))
done = False
#elif (self.beyond_border(self.cur_state[0], self.cur_state[1])):
# rwd = 0.3*np.exp(-curr_dist/1000)*np.exp(-2*(self.steps_done-1)/50)*np.log10(8*self.rate + 1)
# done = False
#elif (self.cur_dist >= self.prev_dist):
# rwd = 0.2*np.exp(-self.cur_dist/1000)*np.exp(-2*(self.steps_done-1)/50)*np.log10(8*self.cur_rate + 1)#*np.exp(-self.rate/20)#-self.rate-1.0#-self.rate -2.0#-20.0
# done = False
else:
rwd = 0.0 #0.2*np.exp(-self.cur_dist/1000)*np.exp(-2*(self.steps_done-1)/50)*np.log10(8*self.rate + 1)
done = False
#done = False
#if self.dest_check():
# done = True
#rwd = np.log10(8*self.rate + 1) + np.exp(-self.cur_dist/1000)*np.exp(-2*(self.steps_done-1)/50)
return rwd, done
#Reward Function for max rate path
def rate_path_gameover(self):
state = np.rint(self.state * self.high_obs)
next_dist = np.sqrt((state[0] - self.ue_xdest[0])**2 +
(state[1] - self.ue_ydest[0])**2)
if (self.dest_check()):
rwd = 1.0 # 3.1#2.1#self.rate + 2.0#2000.0
done = True
elif (next_dist < self.cur_dist):
# rwd = 1.0*np.exp(-1*(self.steps_done-1)/50)*np.log10(max(21-self.rate,0)+1)#*np.exp(self.rate/10)/20#np.log10(max(21.5-self.rate, 0)+1)/3#*np.log10(self.rate+1)# np.exp(self.rate/50)#1.0#self.rate+1.0#self.rate + 2.0 #10*np.log10(val+1) + 2.0
rwd = 0.5 * np.exp(-1 * (self.steps_done - 1) / 50) * np.exp(
self.rate / 20
) # *min(np.exp(self.rate/20), np.exp((self.rate_threshold-self.rate)/20.0))#0.5 * np.exp(-1 * (self.steps_done - 1) / 50) *(1-self.rate/30)
# print(rwd)
done = False
elif (next_dist > self.cur_dist):
rwd = 0.2 * np.exp(-1 * (self.steps_done - 1) / 50) * np.exp(
self.rate / 20
) # *min(np.exp(self.rate/20), np.exp((self.rate_threshold-self.rate)/20.0))
done = False
else:
rwd = -1.0 * np.exp(-1 * (self.steps_done - 1) / 50) * np.exp(
-self.rate / 20) # -self.rate-1.0#-self.rate -2.0#-20.0
done = False
return rwd, done
#Reward function for shortest path
def short_path_gameover(self):
state = np.rint(self.state * self.high_obs)
next_dist = np.sqrt((state[0] - self.ue_xdest[0])**2 +
(state[1] - self.ue_ydest[0])**2)
if (self.dest_check()):
rwd = 1.0 # 3.1#2.1#self.rate + 2.0#2000.0
done = True
elif (next_dist < self.cur_dist):
rwd = 0.2
done = False
else:
rwd = -1.0
done = False
return rwd, done
def decode_action(self, action_ndx):
#ue_vy_ndx = action_ndx % len(self.ue_vy)
#action_ndx = action_ndx // len(self.ue_vy)
#ue_v_ndx = action_ndx % len(self.ue_vx)
#action_ndx = action_ndx // len(self.ue_vx)
ue_mv_ndx = action_ndx % len(self.ue_moves)
action_ndx = action_ndx // len(self.ue_moves)
beam_ndx = action_ndx % self.N
action_ndx = action_ndx // self.N
assert 0 <= action_ndx <= self.act_space.n
return (beam_ndx, ue_mv_ndx)
#Not using this function
def encode_action(self, beam_ndx, ue_vx_ndx, ue_vy_ndx):
i = beam_ndx
i *= self.N
i += ue_vx_ndx
i *= len(self.ue_vx)
i += ue_vy_ndx
i *= len(self.ue_vy)
return i
def choose_vel(self, ue_mv_ndx):
ue_mv = self.ue_moves[ue_mv_ndx]
if ue_mv == 'L': #move left
ue_vx = -1 * self.ue_vx[0]
ue_vy = 0
elif ue_mv == 'U': #move up
ue_vx = 0
ue_vy = self.ue_vy[0]
elif ue_mv == 'D': #move down
ue_vx = 0
ue_vy = -1 * self.ue_vy[0]
else: #move right
ue_vx = self.ue_vx[0]
ue_vy = 0
return ue_vx, ue_vy
def get_Los_Rate(self, state):
state = np.rint(state * self.high_obs)
ue_xloc, ue_yloc = state
sc_xyz = np.array([])
ch_model = 'fsp'
ue_pos = np.array([ue_xloc, ue_yloc, 0])
if (ue_xloc == 0) and (ue_yloc) == 0:
ue_pos = np.array([ue_xloc + 40, ue_yloc + 40, 0])
mimo_model = MIMO(ue_pos, self.gNB[0], sc_xyz, ch_model, self.ptx,
self.N_tx, self.N_rx)
SNR, rate = mimo_model.Los_Rate() # rkbeam_vec, tbeam_vec )
return SNR, rate
def get_Exh_Rate(self, state):
state = np.rint(state * self.high_obs)
ue_xloc, ue_yloc = state
ue_pos = np.array([ue_xloc, ue_yloc, 0])
if (ue_xloc == 0) and (ue_yloc) == 0:
#return -1.0,-1.0
ue_pos = np.array([ue_xloc + 40, ue_yloc + 40, 0])
mimo_exh_model = MIMO(ue_pos, self.gNB[0], self.sc_xyz, self.ch_model,
self.ptx, self.N_tx, self.N_rx)
#rbeam_vec = self.BeamSet#Generate_BeamDir(self.N)
exh_SNR = []
exh_rates = []
for rbeam in self.BeamSet: #rbeam_vec:
SNR, rate = mimo_exh_model.Calc_ExhRate(self.SF_time,
np.array([rbeam, 0]))
#rate = 1e3 * rate
exh_SNR.append(SNR)
exh_rates.append(rate)
best_rbeam_ndx = np.argmax(exh_rates)
best_beam = self.BeamSet[best_rbeam_ndx]
SNRmax, rate_max = mimo_exh_model.Calc_ExhRate(self.SF_time,
np.array([best_beam,
0]),
noise_flag=False)
#print("[UAV_Env]: AOD: {}, AoA: {}, AoD-AoA: {}".format(mimo_exh_model.channel.az_aod[0], self.BeamSet[best_rbeam_ndx], -self.BeamSet[best_rbeam_ndx]+mimo_exh_model.channel.az_aod[0]))
return best_beam, rate_max #(Best RBS, Best Rate)
def get_Rate(self):
return self.cur_rate