diff --git a/doc/TESTING_GNB_W_COTS_UE.md b/doc/TESTING_GNB_W_COTS_UE.md
index e69de29bb2..d3ab9c175b 100644
--- a/doc/TESTING_GNB_W_COTS_UE.md
+++ b/doc/TESTING_GNB_W_COTS_UE.md
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+
+## Configuration Overview:
+
+* Non Standalone (NSA) configuration  : initial Control Plane established between UE and RAN eNB, then User Plane established between UE and gNB, Core network is 4G based supporting rel 15
+
+* Commercial UE: Oppo Reno 5G
+* OAI Software Defined gNB and eNB
+* eNB RF front end: USRP (ETTUS) B200 Mini or B210
+* gNB RF front end: USRP (ETTUS) B200 Mini or B210 (N300 will be needed for MIMO and wider BW's)
+* 5G TDD duplexing mode
+* 5G FR1 Band n78 (3.5 GHz)
+* BW: 40MHz
+* Antenna scheme: SISO
+
+## SW Repository / Branch
+
+https://gitlab.eurecom.fr/oai/openairinterface5g/tree/develop
+
+## Architecture Setup
+
+photos and schemes
+
+![image info](https://gitlab.eurecom.fr/oai/openairinterface5g/-/blob/rh_doc_update_3/doc/testing_gnb_w_cots_ue_resources/oppo.jpg)
+
+
+## Build and Install
+
+General guidelines for building :
+See https://gitlab.eurecom.fr/oai/openairinterface5g/blob/develop/doc/BUILD.md#building-ues-enodeb-and-gnodeb-executables
+
+### **EPC**
+
+for reference:
+https://github.com/OPENAIRINTERFACE/openair-epc-fed/blob/master-documentation/docs/DEPLOY_HOME.md
+
+```
+sudo bash
+cd /opt/hss_sim0609
+./starthss_real
+```
+
+### **eNB**
+
+```
+sudo bash
+cd /opt/hss_sim0609
+./starthss_real
+```
+
+### **gNB**
+
+```
+sudo bash
+cd /opt/hss_sim0609
+./starthss_real
+```
+
+## Testing
+
+* EPC launching (on EPC host):
+
+```
+sudo bash
+cd /opt/hss_sim0609
+./starthss_real
+```
+
+Open another window and:
+
+```
+sudo bash
+cd /opt/ltebox/tools
+./stop_ltebox
+./start_ltebox
+```
+
+Note: when terminated the testing session, you shall stop the EPC by "./stop_ltebox"
+
+
+* eNB launching (on the eNB host):
+
+~/openairinterface5g/cmake_targets/ran_build/build$ sudo ./lte-softmodem -O ../../../targets/PROJECTS/GENERIC-LTE-EPC/CONF/enb.band7.tm1.50PRB.usrpb210.conf (-E)
+
+
+eNB is using branch NR_RRCConfiguration patched with enb.diff
+
+
+* gNB launching (on the gNB host)
+
+~/openairinterface5g/cmake_targets/ran_build/build$ sudo ./nr-softmodem -O ../../../targets/PROJECTS/GENERIC-LTE-EPC/CONF/gnb.band78.tm1.106PRB.usrpn300.conf (-E)
+
+Note: gNB is using branch NR_RRC_PRACH_procedures patched with gnb.diff
+
+
+Status of the interoperability is as follows:
+- setup of the CP in 4G
+- setup of the measurements in 5G
+- Random access procedure initiation by the UE in the 5G cell
+- msg1, msg2, msg3 correctly exchanged and decoded
+
+
+[enb.conf](uploads/48bbbcc8016a33ce6d2faf62e3845005/enb.conf)
+[enb.diff](uploads/9763bd6d18256612d007251bc371ca46/enb.diff)
+[gnb.conf](uploads/59ae03deccb2186f544451034c297838/gnb.conf)
+[gnb.diff](uploads/bb756b2b165cb70f89405d7a8c4c36a8/gnb.diff)
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