diff --git a/src/osmo_gsm_tester/obj/enb.py b/src/osmo_gsm_tester/obj/enb.py
index f15bbe30..906164ee 100644
--- a/src/osmo_gsm_tester/obj/enb.py
+++ b/src/osmo_gsm_tester/obj/enb.py
@@ -30,6 +30,9 @@ def on_register_schemas():
         'gtp_bind_addr': schema.IPV4,
         'id': schema.UINT,
         'num_prb': schema.UINT,
+        'duplex': schema.STR,
+        'tdd_uldl_config': schema.UINT,
+        'tdd_special_subframe_pattern': schema.UINT,
         'transmission_mode': schema.LTE_TRANSMISSION_MODE,
         'tx_gain': schema.UINT,
         'rx_gain': schema.UINT,
@@ -83,6 +86,7 @@ class eNodeB(log.Origin, metaclass=ABCMeta):
         self.set_name('%s_%s' % (name, self._run_node.run_addr()))
         self._txmode = 0
         self._id = None
+        self._duplex = None
         self._num_prb = 0
         self._num_cells = None
         self._epc = None
@@ -144,6 +148,8 @@ class eNodeB(log.Origin, metaclass=ABCMeta):
         config.overlay(values, dict(enb=self._conf))
         self._id = int(values['enb'].get('id', None))
         assert self._id is not None
+        self._duplex = values['enb'].get('duplex', None)
+        assert self._duplex
         self._num_prb = int(values['enb'].get('num_prb', None))
         assert self._num_prb
         self._txmode = int(values['enb'].get('transmission_mode', None))
diff --git a/src/osmo_gsm_tester/obj/enb_amarisoft.py b/src/osmo_gsm_tester/obj/enb_amarisoft.py
index 9bed63ee..ef281009 100644
--- a/src/osmo_gsm_tester/obj/enb_amarisoft.py
+++ b/src/osmo_gsm_tester/obj/enb_amarisoft.py
@@ -263,6 +263,12 @@ class AmarisoftENB(enb.eNodeB):
         return rfemu_obj
 
     def ue_max_rate(self, downlink=True, num_carriers=1):
+        if self._duplex == 'fdd':
+            return self.ue_max_rate_fdd(downlink, num_carriers)
+        else:
+            return self.ue_max_rate_tdd(downlink, num_carriers)
+
+    def ue_max_rate_fdd(self, downlink, num_carriers):
         # The max rate for a single UE per PRB configuration in TM1 with MCS 28 QAM64
         max_phy_rate_tm1_dl = { 6 : 3.2e6,
                                15 : 9.2e6,
@@ -299,4 +305,19 @@ class AmarisoftENB(enb.eNodeB):
 
         return max_rate
 
+    def ue_max_rate_tdd(self, downlink, num_carriers):
+        # Max rate calculation for TDD depends on the acutal TDD configuration
+        # See: https://www.sharetechnote.com/html/Handbook_LTE_ThroughputCalculationExample_TDD.html
+        # and https://i0.wp.com/www.techtrained.com/wp-content/uploads/2017/09/Blog_Post_1_TDD_Max_Throughput_Theoretical.jpg
+        max_phy_rate_tdd_uldl_config0_sp0 = { 6 : 1.5e6,
+                               15 : 3.7e6,
+                               25 : 6.1e6,
+                               50 : 12.2e6,
+                               75 : 18.4e6,
+                               100 : 54.5e6 }
+        if downlink:
+            max_rate = max_phy_rate_tdd_uldl_config0_sp0[self.num_prb()]
+        else:
+            return 1e6 # dummy value, we need to replace that later
+
 # vim: expandtab tabstop=4 shiftwidth=4
diff --git a/src/osmo_gsm_tester/templates/amarisoft_enb.cfg.tmpl b/src/osmo_gsm_tester/templates/amarisoft_enb.cfg.tmpl
index c5b8a1e6..a0f22ff8 100644
--- a/src/osmo_gsm_tester/templates/amarisoft_enb.cfg.tmpl
+++ b/src/osmo_gsm_tester/templates/amarisoft_enb.cfg.tmpl
@@ -100,6 +100,11 @@
       "${'{0:03}'.format(int(enb.mcc))}${'{0:02}'.format(int(enb.mnc))}",
     ],
 
+% if enb.get('duplex') == "tdd":
+    uldl_config: ${enb.tdd_uldl_config},
+    sp_config: ${enb.tdd_special_subframe_pattern},
+% endif
+
 % if int(enb.get('transmission_mode')) == 1:
     n_antenna_dl: 1, /* number of DL antennas */
     n_antenna_ul: 1, /* number of UL antennas */
@@ -180,7 +185,10 @@
         /* TDD ack/nack feedback mode when a rel 10 UE is detected. It
            can be "bundling", "multiplexing", "cs" or "pucch3". By
            default is it the same as tdd_ack_nack_feedback_mode. */
+% if enb.get('duplex') == "tdd":
+        tdd_ack_nack_feedback_mode: "bundling",
         // tdd_ack_nack_feedback_mode_r10: "cs",
+% endif
 
         /* number of PUCCH 1b CS resources. It determines
            the maximum number of UEs that can be scheduled in one TTI
diff --git a/sysmocom/defaults.conf b/sysmocom/defaults.conf
index 419c3a46..8201d051 100644
--- a/sysmocom/defaults.conf
+++ b/sysmocom/defaults.conf
@@ -110,6 +110,7 @@ enb:
   id: 0x19B
   mcc: 901
   mnc: 70
+  duplex: fdd
   transmission_mode: 1
   num_cells: 1
   inactivity_timer: 20000
diff --git a/sysmocom/scenarios/mod-enb-tdd.conf b/sysmocom/scenarios/mod-enb-tdd.conf
new file mode 100644
index 00000000..3f6355b1
--- /dev/null
+++ b/sysmocom/scenarios/mod-enb-tdd.conf
@@ -0,0 +1,13 @@
+# TDD cell
+modifiers:
+  enb:
+  - duplex: tdd
+    tdd_uldl_config: 0
+    tdd_special_subframe_pattern: 4
+    cell_list:
+    - cell_id: 0x01
+      pci: 0x01
+      dl_earfcn: 40620
+      rf_port: 0
+      scell_list: []
+      ncell_list: []