From 028f18e6d54eec92fecfb8eb86564b9ac420c9a8 Mon Sep 17 00:00:00 2001
From: "Michael R. Davis" <mrdvt92@yahoo.com>
Date: Wed, 19 Feb 2025 17:49:55 +0000
Subject: [PATCH] propagation: (merges !2352) Fix Okumura Hata propagation loss
 model for open areas environment

---
 src/buildings/test/buildings-pathloss-test.cc                | 2 +-
 src/propagation/doc/propagation.rst                          | 2 +-
 src/propagation/model/okumura-hata-propagation-loss-model.cc | 2 +-
 src/propagation/test/okumura-hata-test-suite.cc              | 2 +-
 4 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/buildings/test/buildings-pathloss-test.cc b/src/buildings/test/buildings-pathloss-test.cc
index 8a2205720..ef392e551 100644
--- a/src/buildings/test/buildings-pathloss-test.cc
+++ b/src/buildings/test/buildings-pathloss-test.cc
@@ -68,7 +68,7 @@ BuildingsPathlossTestSuite::BuildingsPathlossTestSuite()
                                               2,
                                               OpenAreasEnvironment,
                                               LargeCity,
-                                              110.21,
+                                              109.66,
                                               "loss OH OpenAreas"),
                 TestCase::Duration::QUICK);
 
diff --git a/src/propagation/doc/propagation.rst b/src/propagation/doc/propagation.rst
index 42bea1f72..b69984bd6 100644
--- a/src/propagation/doc/propagation.rst
+++ b/src/propagation/doc/propagation.rst
@@ -410,7 +410,7 @@ The extension for the standard OH in open area is
 
 .. math::
 
-  L_\mathrm{O} = L_\mathrm{U} - 4.70 (\log{f})^2 + 18.33\log{f} - 40.94
+  L_\mathrm{O} = L_\mathrm{U} - 4.78 (\log{f})^2 + 18.33\log{f} - 40.94
 
 
 The literature lacks of extensions of the COST231 to open area (for suburban it seems that
diff --git a/src/propagation/model/okumura-hata-propagation-loss-model.cc b/src/propagation/model/okumura-hata-propagation-loss-model.cc
index fee8c51ca..7a3b32c2e 100644
--- a/src/propagation/model/okumura-hata-propagation-loss-model.cc
+++ b/src/propagation/model/okumura-hata-propagation-loss-model.cc
@@ -120,7 +120,7 @@ OkumuraHataPropagationLossModel::GetLoss(Ptr<MobilityModel> a, Ptr<MobilityModel
         }
         else if (m_environment == OpenAreasEnvironment)
         {
-            loss += -4.70 * std::pow(log_fMhz, 2) + 18.33 * log_fMhz - 40.94;
+            loss += -4.78 * std::pow(log_fMhz, 2) + 18.33 * log_fMhz - 40.94;
         }
     }
     else
diff --git a/src/propagation/test/okumura-hata-test-suite.cc b/src/propagation/test/okumura-hata-test-suite.cc
index 14743f4d8..90b5fa213 100644
--- a/src/propagation/test/okumura-hata-test-suite.cc
+++ b/src/propagation/test/okumura-hata-test-suite.cc
@@ -174,7 +174,7 @@ OkumuraHataPropagationLossModelTestSuite::OkumuraHataPropagationLossModelTestSui
                                                             1,
                                                             OpenAreasEnvironment,
                                                             LargeCity,
-                                                            110.21,
+                                                            109.66,
                                                             "original OH OpenAreas"),
                 TestCase::Duration::QUICK);