Harald Welte has submitted this change and it was merged. (
https://gerrit.osmocom.org/10305 )
Change subject: trx_toolkit/fake_trx: introduce basic path loss simulation
......................................................................
trx_toolkit/fake_trx: introduce basic path loss simulation
This change introduces a couple of new CTRL commands for path loss
simulation, in particular a possibility to drop some amount of
bursts according to some TDMA frame period, separately for both
Uplink and Downlink directions.
Examples:
FAKE_DROP 4 - drop 4 consistent (period=1) bursts,
FAKE_DROP 16 2 - drop 16 even bursts (period=2).
Change-Id: Ib210138a03e2377c79875a4ff2f2bb58a43cfa46
Related: OS#3428
---
M src/target/trx_toolkit/burst_fwd.py
M src/target/trx_toolkit/ctrl_if_bb.py
M src/target/trx_toolkit/ctrl_if_bts.py
3 files changed, 123 insertions(+), 0 deletions(-)
Approvals:
Jenkins Builder: Verified
Harald Welte: Looks good to me, approved
diff --git a/src/target/trx_toolkit/burst_fwd.py
b/src/target/trx_toolkit/burst_fwd.py
index bfbe0d6..3834849 100644
--- a/src/target/trx_toolkit/burst_fwd.py
+++ b/src/target/trx_toolkit/burst_fwd.py
@@ -66,6 +66,15 @@
rssi_dl_threshold = 10
rssi_ul_threshold = 5
+ # Path loss simulation: DL/UL burst dropping
+ # Indicates how many bursts should be dropped
+ # and which dropping period is used. By default,
+ # period is 1, i.e. every burst (fn % 1 is always 0)
+ burst_dl_drop_amount = 0
+ burst_ul_drop_amount = 0
+ burst_dl_drop_period = 1
+ burst_ul_drop_period = 1
+
def __init__(self, bts_link, bb_link):
self.bts_link = bts_link
self.bb_link = bb_link
@@ -131,6 +140,30 @@
# Generate a random RSSI value
return random.randint(rssi_min, rssi_max)
+ # DL path loss simulation
+ def path_loss_sim_dl(self, msg):
+ # Burst dropping
+ if self.burst_dl_drop_amount > 0:
+ if msg.fn % self.burst_dl_drop_period == 0:
+ print("[~] Simulation: dropping DL burst (fn=%u
%% %u == 0)"
+ % (msg.fn, self.burst_dl_drop_period))
+ self.burst_dl_drop_amount -= 1
+ return None
+
+ return msg
+
+ # UL path loss simulation
+ def path_loss_sim_ul(self, msg):
+ # Burst dropping
+ if self.burst_ul_drop_amount > 0:
+ if msg.fn % self.burst_ul_drop_period == 0:
+ print("[~] Simulation: dropping UL burst (fn=%u
%% %u == 0)"
+ % (msg.fn, self.burst_ul_drop_period))
+ self.burst_ul_drop_amount -= 1
+ return None
+
+ return msg
+
# DL burst preprocessing
def preprocess_dl_burst(self, msg):
# Calculate both RSSI and ToA values
@@ -180,6 +213,11 @@
if msg.tn != self.ts_pass:
return None
+ # Path loss simulation
+ msg = self.path_loss_sim_dl(msg)
+ if msg is None:
+ return None
+
# Burst preprocessing
self.preprocess_dl_burst(msg)
@@ -211,6 +249,11 @@
if msg is None:
return None
+ # Path loss simulation
+ msg = self.path_loss_sim_ul(msg)
+ if msg is None:
+ return None
+
# Burst preprocessing
self.preprocess_ul_burst(msg)
diff --git a/src/target/trx_toolkit/ctrl_if_bb.py
b/src/target/trx_toolkit/ctrl_if_bb.py
index 3de14ef..929caf4 100644
--- a/src/target/trx_toolkit/ctrl_if_bb.py
+++ b/src/target/trx_toolkit/ctrl_if_bb.py
@@ -150,6 +150,46 @@
return 0
+ # Path loss simulation for UL: burst dropping
+ # Syntax: CMD FAKE_DROP <AMOUNT>
+ # Dropping pattern: fn % 1 == 0
+ elif self.verify_cmd(request, "FAKE_DROP", 1):
+ print("[i] Recv FAKE_DROP cmd")
+
+ # Parse / validate amount of bursts
+ num = int(request[1])
+ if num < 0:
+ print("[!] FAKE_DROP amount shall not be
negative")
+ return -1
+
+ self.burst_fwd.burst_ul_drop_amount = num
+ self.burst_fwd.burst_ul_drop_period = 1
+
+ return 0
+
+ # Path loss simulation for UL: burst dropping
+ # Syntax: CMD FAKE_DROP <AMOUNT> <FN_PERIOD>
+ # Dropping pattern: fn % period == 0
+ elif self.verify_cmd(request, "FAKE_DROP", 2):
+ print("[i] Recv FAKE_DROP cmd")
+
+ # Parse / validate amount of bursts
+ num = int(request[1])
+ if num < 0:
+ print("[!] FAKE_DROP amount shall not be
negative")
+ return -1
+
+ # Parse / validate period
+ period = int(request[2])
+ if period <= 0:
+ print("[!] FAKE_DROP period shall be greater
than zero")
+ return -1
+
+ self.burst_fwd.burst_ul_drop_amount = num
+ self.burst_fwd.burst_ul_drop_period = period
+
+ return 0
+
# Wrong / unknown command
else:
# We don't care about other commands,
diff --git a/src/target/trx_toolkit/ctrl_if_bts.py
b/src/target/trx_toolkit/ctrl_if_bts.py
index 1488617..72a0371 100644
--- a/src/target/trx_toolkit/ctrl_if_bts.py
+++ b/src/target/trx_toolkit/ctrl_if_bts.py
@@ -118,6 +118,46 @@
return 0
+ # Path loss simulation for DL: burst dropping
+ # Syntax: CMD FAKE_DROP <AMOUNT>
+ # Dropping pattern: fn % 1 == 0
+ elif self.verify_cmd(request, "FAKE_DROP", 1):
+ print("[i] Recv FAKE_DROP cmd")
+
+ # Parse / validate amount of bursts
+ num = int(request[1])
+ if num < 0:
+ print("[!] FAKE_DROP amount shall not be
negative")
+ return -1
+
+ self.burst_fwd.burst_dl_drop_amount = num
+ self.burst_fwd.burst_dl_drop_period = 1
+
+ return 0
+
+ # Path loss simulation for DL: burst dropping
+ # Syntax: CMD FAKE_DROP <AMOUNT> <FN_PERIOD>
+ # Dropping pattern: fn % period == 0
+ elif self.verify_cmd(request, "FAKE_DROP", 2):
+ print("[i] Recv FAKE_DROP cmd")
+
+ # Parse / validate amount of bursts
+ num = int(request[1])
+ if num < 0:
+ print("[!] FAKE_DROP amount shall not be
negative")
+ return -1
+
+ # Parse / validate period
+ period = int(request[2])
+ if period <= 0:
+ print("[!] FAKE_DROP period shall be greater
than zero")
+ return -1
+
+ self.burst_fwd.burst_dl_drop_amount = num
+ self.burst_fwd.burst_dl_drop_period = period
+
+ return 0
+
# Wrong / unknown command
else:
# We don't care about other commands,
--
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Gerrit-Project: osmocom-bb
Gerrit-Branch: master
Gerrit-MessageType: merged
Gerrit-Change-Id: Ib210138a03e2377c79875a4ff2f2bb58a43cfa46
Gerrit-Change-Number: 10305
Gerrit-PatchSet: 1
Gerrit-Owner: Vadim Yanitskiy <[email protected]>
Gerrit-Reviewer: Harald Welte <[email protected]>
Gerrit-Reviewer: Jenkins Builder
