diff --git a/developer/gnbsim.rst b/developer/gnbsim.rst
index 927c8af..9c769b7 100644
--- a/developer/gnbsim.rst
+++ b/developer/gnbsim.rst
@@ -3,10 +3,104 @@
    SPDX-License-Identifier: Apache-2.0
 .. _gNB-Simulator:
 
-gNB Simulator
-=============
+gNB Simulator Deployment
+========================
 
-.. image:: ../_static/images/gNBSim.png
+gNB Simulator can be deployed in following modes,
+
+**gNB simulator in AIAB mode with 2 interfaces:**
+-------------------------------------------------
+
+- This is default mode of deployment for gNB Simulator
+- Multus cni needs to be enabled on cluster. Required for bess-upf & gNB
+- `make 5gc` will by default deploy gNB Simulator in this mode
+- One interface is used for user plane traffic towards UPF
+- Second interface is used to send traffic towards control plane (i.e. AMF).
+- UPF network & default gateway is provided in the override values.
+- Route to UPF network is added when POD comes up
+- defaultAs is configured per profile. This address is used to send data traffic during test
+
+.. note::
+   Multiple gNB's in one simulator instance need more changes in helm chart. This is pending work.
+
+To add UPF routes. Following is example of override values ::
+
+  config:
+    gnbsim:
+      gnb:
+        ip: 192.168.251.5/24 #user plane IP at gnb if 2 separate interface provided
+      singleInterface: false
+      networkTopo:
+        - upfAddr: "192.168.252.3/32"
+          upfGw: "192.168.251.1"
+
+
+.. image:: ../_static/images/Single-cluster_2_interface.jpg
+  :width: 700px
+
+**gNB simulator running standalone with 2 or more interfaces**
+--------------------------------------------------------------
+
+- Install gNB Simulator on any K8s cluster
+- Multus cni needs to be enabled on cluster. Required for bess-upf & gNB
+- Make sure gNB Simulator can communicate with AMF & UPF
+- *TODO* - New Makefile target will deploy just 5G control plane
+- *TODO* - New Makefile target will deploy only gNB Simulator
+- One interface is used for user plane traffic towards UPF
+- Second interface is used to send traffic towards control plane (i.e. AMF).
+- UPF network & default gateway is provided in the override values.
+- Route to UPF network is added when POD comes up
+- defaultAs is configured per profile. This address is used to send data traffic during test
+- configure AMF address or FQDN appropriately
+
+.. note::
+   Multiple gNB's in one simulator instance need more changes in helm chart. This is pending work.
+
+
+To add UPF routes. Following is example of override values ::
+
+  config:
+    gnbsim:
+      gnb:
+        ip: 192.168.251.5/24 #user plane IP at gnb if 2 separate interface provided
+      singleInterface: false
+      networkTopo:
+        - upfAddr: "192.168.252.3/32"
+          upfGw: "192.168.251.1"
+
+.. image:: ../_static/images/Separate-cluster_2_interface.jpg
+  :width: 700px
+
+
+**gNB simulator running standalone with single interface**
+----------------------------------------------------------
+
+- Install gNB Simulator on any K8s cluster
+- Multus cni needs to be enabled for the K8s cluster where bess-upf runs
+- Make sure gNB Simulator can communicate with AMF & UPF
+- *TODO* - New Makefile target will deploy just 5G control plane
+- *TODO* - New Makefile target will deploy only gNB Simulator
+- Single interface is used for user plane traffic towards UPF & as well traffic towards AMF
+- defaultAs is configured per profile. This address is used to send data traffic during test
+- configure AMF address or FQDN appropriately
+
+.. note::
+  Multiple gNB's can not be simulated since only 1 gNB will be able to use 2152 port
+
+
+Following is example of override values ::
+
+  config:
+    gnbsim:
+      singleInterface: true
+      yamlCfgFiles:
+        gnb.conf:
+          configuration:
+             gnbs: # pool of gNodeBs
+               gnb1:
+                 n3IpAddr: "POD_IP" # set if singleInterface is true
+
+.. image:: ../_static/images/Separate-cluster_Single_interface.jpg
   :width: 700px
 
 Description