Changes between Version 20 and Version 21 of Tutorials/g0WmLTE/Tutorial4-OAI

Timestamp:

Jun 9, 2015, 7:08:11 PM (9 years ago)

Author:

shsagari

Comment:

—

Tutorials/g0WmLTE/Tutorial4-OAI

@@ -24 +24 @@
 || [[Image(node9-1.png, width=200)]] || [[Image(node6-20.png, width=200)]] ||
   2. '''Prepare configuration files:''' Make sure to have correct parameters in oai.conf file in roots home directory on the node (/root) as follows:
-     a. Make sure to have correct E-UTRA band, corresponding duplex mode (e.g. FDD/TDD), downlink frequency [Hz], uplink frequency offset [Hz] (which is given in reference to the downlink frequency).
-     b. Make sure to have correct IP address configuration for parameters "ENB_IPV4_ADDRESS_FOR_S1_MME" and "ENB_IPV4_ADDRESS_FOR_S1U" to match node numbers.   For example, for nodeX-Y, these IP address parameters become as "10.10.X.Y/16". So for our basestation node the relevant sections in the oai.conf file in /root directory on the nodes we should look like (we don't want MME support and have to adjust the ip addresses to match what we have on the control interface of the node):
-{{{
+     i. Operating frequency band parameters: 
+          a. E-UTRA band
+          b. Corresponding duplex mode (e.g. FDD/TDD), 
+          c. Downlink frequency [Hz], uplink frequency offset [Hz] (which is given in reference to the downlink frequency).
+          d. LTE bandwidth: N_RB_DL = {6,15,25,50,75,100} corresponding to bandwidth = {1.4,3,5,10,15,20} MHz
+          For example:
+          {{{
+    ////////// Physical parameters:
+    component_carriers = (
+                         {
+                           frame_type                                         = "FDD";
+                           eutra_band                                         = 7;
+                           downlink_frequency                                 = 2660000000L;
+                           uplink_frequency_offset                            = -120000000;
+                           N_RB_DL                                            = 25; #N_RB_DL choice: 6,15,25,50,75,100
+                         }
+                         );
+          }}}
+          In this example, LTE operates in E-UTRA band 7 which allows the FDD mode. LTE operates at 5 MHz bandwidth around downlink and uplink center frequencies which are at 2660 MHz and 2540 MHz, respectively.
+
+          Parameters in oai.conf can be varied as long as they are within predefined set of values which can be found in file ~/rel_0.1_26.10.2014/openair2/ENB_APP/enb_config.c or ~/trunk/openair2/ENB_APP/enb_config.c
+
+     ii. Make sure to have correct IP address configuration for parameters "ENB_IPV4_ADDRESS_FOR_S1_MME" and "ENB_IPV4_ADDRESS_FOR_S1U" to match node numbers.   For example, for nodeX-Y, these IP address parameters become as "10.10.X.Y/16". So for our basestation node the relevant sections in the oai.conf file in /root directory on the nodes we should look like (we don't want MME support and have to adjust the ip addresses to match what we have on the control interface of the node):
+     {{{
     ////////// MME parameters:
     mme_ip_address      = ( { ipv4       = "10.10.0.100";
@@ -44 +65 @@
         ENB_PORT_FOR_S1U                         = 2152; # Spec 2152
     };
-}}}
-  1. '''Run the lte-softmodem:''' Depending on whether you want to run it with or without mme, execute lte-softmodem on corresponding nodes:
+     }}}
+  3. '''Run the lte-softmodem:''' Depending on whether you want to run it with or without mme, execute lte-softmodem on corresponding nodes:
 
  || || On the eNB node (node9-1) || On the UE node (node6-20)  ||