Changes between Initial Version and Version 1 of Tutorials/g0WmLTE/Tutorial4-OAI/Tutorial0


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Dec 1, 2016, 5:09:24 AM (8 years ago)
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seskar
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  • Tutorials/g0WmLTE/Tutorial4-OAI/Tutorial0

    v1 v1  
     1=== Basic OAI Tutorial ===
     2
     3[[TOC(noheading, Tutorials/g0WmLTE*, depth=3)]]
     4
     5Three nodes...
     6
     7==== Objective ====
     8Primary objective is to establish the LTE connection between the SDR based  UE and eNB. In order to that we need to prepare configuration files on two nodes: node9-1 and node6-20.
     9
     10------------------------------
     11
     12The code was compiled with USRP support i.e. with:
     13{{{
     14cd trunk/targets/bin; build_oai.bash -l ENB -c -w USRP
     15}}}
     16More details on various build options are available on [https://twiki.eurecom.fr/twiki/bin/view/OpenAirInterface/AutoBuild OpenAirInterface build page].
     17
     18In this tutorial we will use nodes with USRP b310 and have the basestation on node9-1 and modem on node6-20.
     19
     20==== Prepare the nodes ====
     21
     22 1. Load the image with the !OpenAirInterface code on the nodes that have USRP B210 attached. After imaging the nodes are '''turned off automatically'''. [[CollapsibleStart(omf load -t inventory:topo:B210 -i oai-master.ndz)]] [[Include(Documentation/Short/LoadImage)]][[CollapsibleEnd]]
     23 1. Turn ON the nodes that successfully imaged (give them some time and check their status with '''omf stat''' before proceeding). [[CollapsibleStart(omf tell -a on -t system:topo:imaged)]][[Include(Documentation/Short/TellOn)]][[CollapsibleEnd]]
     24
     25==== Execute the experiment ====
     26
     27  1. '''ssh into nodes:''' Open the two ssh sessions from the console to the two nodes
     28|| [[Image(node9-1.png, width=200)]] || [[Image(node6-20.png, width=200)]] ||
     29  2. '''Prepare configuration files:''' Make sure to have correct parameters in oai.conf file in roots home directory on the node (/root) as follows:
     30     i. Operating frequency band parameters:
     31          a. E-UTRA band
     32          b. Corresponding duplex mode (e.g. FDD/TDD),
     33          c. Downlink frequency [Hz], uplink frequency offset [Hz] (which is given in reference to the downlink frequency).
     34          d. LTE bandwidth: N_RB_DL = {6,15,25,50,75,100} corresponding to bandwidth = {1.4,3,5,10,15,20} MHz
     35          For example:
     36          {{{
     37    ////////// Physical parameters:
     38    component_carriers = (
     39                         {
     40                           frame_type                                         = "FDD";
     41                           eutra_band                                         = 7;
     42                           downlink_frequency                                 = 2660000000L;
     43                           uplink_frequency_offset                            = -120000000;
     44                           N_RB_DL                                            = 25; #N_RB_DL choice: 6,15,25,50,75,100
     45                         }
     46                         );
     47          }}}
     48          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.
     49
     50          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
     51
     52     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):
     53     {{{
     54    ////////// MME parameters:
     55    mme_ip_address      = ( { ipv4       = "10.10.0.100";
     56                              ipv6       = "10:10:0::100";
     57                              active     = "no";
     58                              preference = "ipv4";
     59                            }
     60                          );
     61
     62    NETWORK_INTERFACES :
     63    {
     64        ENB_INTERFACE_NAME_FOR_S1_MME            = "eth1";
     65        ENB_IPV4_ADDRESS_FOR_S1_MME              = "10.10.9.1/24";
     66
     67        ENB_INTERFACE_NAME_FOR_S1U               = "eth1";
     68        ENB_IPV4_ADDRESS_FOR_S1U                 = "10.10.9.1/24";
     69        ENB_PORT_FOR_S1U                         = 2152; # Spec 2152
     70    };
     71     }}}
     72  3. '''Run the lte-softmodem:''' Depending on whether you want to run it with or without mme, execute lte-softmodem on corresponding nodes:
     73
     74 || || On the eNB node (node9-1) || On the UE node (node6-20)  ||
     75 || w/o MME || {{{ lte-softmodem-nomme -Ooai.conf -V}}} || {{{ lte-softmodem -U -Ooai.conf -C 2660000000 -V}}} ||
     76 || w MME || {{{ lte-softmodem -Ooai.conf -V}}} || {{{ lte-softmodem -U -Ooai.conf -C 2660000000 -V}}} ||
     77
     78If the above commands are executed with the "-d" flag and if X11 forwarding is enabled for the current ssh session, the signal tracer will pop out as shown in Figure 1 (not that this requires relatively high bandwidth).
     79[[Image(Scope.png, width=300)]] ||
     80
     81[[CollapsibleStart(The output on both consoles should look something like this:)]]
     82{{{
     83[RRC][I][eNB 0] Init (UE State = RRC_IDLE)...
     84[RRC][I][eNB 0] Checking release
     85[RRC][I][eNB 0] Rel8 RRC
     86[RRC][I][eNB 0] Configuration SIB2/3
     87[MAC][I][rrc_mac_config_req] [CONFIG][eNB 0] Configuring MAC/PHY
     88[MAC][I][rrc_mac_config_req] [CONFIG]SIB2/3 Contents (partial)
     89[MAC][I][rrc_mac_config_req] [CONFIG]pusch_config_common.n_SB = 1
     90[MAC][I][rrc_mac_config_req] [CONFIG]pusch_config_common.hoppingMode = 0
     91[MAC][I][rrc_mac_config_req] [CONFIG]pusch_config_common.pusch_HoppingOffset = 0
     92[MAC][I][rrc_mac_config_req] [CONFIG]pusch_config_common.enable64QAM = 0
     93[MAC][I][rrc_mac_config_req] [CONFIG]pusch_config_common.groupHoppingEnabled = 1
     94[MAC][I][rrc_mac_config_req] [CONFIG]pusch_config_common.groupAssignmentPUSCH = 0
     95[MAC][I][rrc_mac_config_req] [CONFIG]pusch_config_common.sequenceHoppingEnabled = 0
     96[MAC][I][rrc_mac_config_req] [CONFIG]pusch_config_common.cyclicShift  = 1
     97[RRC][I][eNB 0] OPENAIR RRC IN....
     98[SCTP][I][sctp_handle_new_association_req] Setsockopt SOL_SOCKET socket bound to : eth1
     99[SCTP][I][sctp_handle_new_association_req] Converted ipv4 address 10.10.0.100 to network type
     100[SCTP][I][sctp_handle_new_association_req] connectx assoc_id  1 in progress..., used 1 addresses
     101[SCTP][I][sctp_handle_new_association_req] Inserted new descriptor for sd 56 in list, nb elements 1, assoc_id 1
     102[SCTP][I][sctp_eNB_flush_sockets] Found data for descriptor 56
     103[SCTP][I][sctp_eNB_read_from_socket] Received notification for sd 56, type 32769
     104[SCTP][I][sctp_eNB_read_from_socket] Client association changed: 0
     105[SCTP][I][sctp_get_peeraddresses] ----------------------
     106[SCTP][I][sctp_get_peeraddresses] Peer addresses:
     107[SCTP][I][sctp_get_peeraddresses]     - [10.10.0.100]
     108[SCTP][I][sctp_get_peeraddresses] ----------------------
     109[SCTP][I][sctp_get_sockinfo] ----------------------
     110[SCTP][I][sctp_get_sockinfo] SCTP Status:
     111[SCTP][I][sctp_get_sockinfo] assoc id .....: 1
     112[SCTP][I][sctp_get_sockinfo] state ........: 3
     113[SCTP][I][sctp_get_sockinfo] instrms ......: 8
     114[SCTP][I][sctp_get_sockinfo] outstrms .....: 64
     115[SCTP][I][sctp_get_sockinfo] fragmentation : 1452
     116[SCTP][I][sctp_get_sockinfo] pending data .: 0
     117[SCTP][I][sctp_get_sockinfo] unack data ...: 0
     118[SCTP][I][sctp_get_sockinfo] rwnd .........: 106496
     119[SCTP][I][sctp_get_sockinfo] peer info     :
     120[SCTP][I][sctp_get_sockinfo]     state ....: 2
     121[SCTP][I][sctp_get_sockinfo]     cwnd .....: 4380
     122[SCTP][I][sctp_get_sockinfo]     srtt .....: 0
     123[SCTP][I][sctp_get_sockinfo]     rto ......: 3000
     124[SCTP][I][sctp_get_sockinfo]     mtu ......: 1500
     125[SCTP][I][sctp_get_sockinfo] ----------------------
     126[SCTP][I][sctp_eNB_read_from_socket] Comm up notified for sd 56, assigned assoc_id 1
     127[S1AP][I][s1ap_eNB_generate_s1_setup_request] 3584 -> 00e000
     128[SCTP][I][sctp_send_data] Successfully sent 53 bytes on stream 0 for assoc_id 1
     129[SCTP][I][sctp_eNB_flush_sockets] Found data for descriptor 56
     130[SCTP][I][sctp_eNB_read_from_socket] Received notification for sd 56, type 32777
     131[SCTP][I][sctp_eNB_flush_sockets] Found data for descriptor 56
     132[SCTP][I][sctp_eNB_read_from_socket] [1][56] Msg of length 27 received from port 36412, on stream 0, PPID 18
     133[S1AP][I][s1ap_decode_s1ap_s1setupresponseies] Decoding message S1ap_S1SetupResponseIEs (/root/trunk/targets/RT/USER/objs/openair-cn/S1AP/s1ap_decoder.c:3544)
     134[ENB_APP][I][eNB_app_task] [eNB 0] Received S1AP_REGISTER_ENB_CNF: associated MME 1
     135Waiting for eNB application to be ready
     136[HW][I][SCHED] eNB TX thread 0 started on CPU 5
     137[HW][I][SCHED][eNB] eNB RX thread 0 started on CPU 0
     138[HW][I][SCHED] eNB TX thread 1 started on CPU 0
     139[HW][I][SCHED][eNB] eNB RX thread 1 started on CPU 5
     140[HW][I][SCHED] eNB TX thread 2 started on CPU 2
     141[HW][I][SCHED][eNB] eNB RX thread 2 started on CPU 0
     142[HW][I][SCHED] eNB TX thread 3 started on CPU 5
     143[HW][I][SCHED][eNB] eNB RX thread 3 started on CPU 5
     144[HW][I][SCHED] eNB TX thread 4 started on CPU 4
     145[HW][I][SCHED][eNB] eNB RX thread 4 started on CPU 1
     146[HW][I][SCHED] eNB TX thread 5 started on CPU 4
     147[HW][I][SCHED][eNB] eNB RX thread 5 started on CPU 4
     148[HW][I][SCHED] eNB TX thread 6 started on CPU 0
     149[HW][I][SCHED][eNB] eNB RX thread 6 started on CPU 1
     150[HW][I][SCHED] eNB TX thread 7 started on CPU 1
     151[HW][I][SCHED][eNB] eNB RX thread 7 started on CPU 0
     152[HW][I][SCHED] eNB TX thread 8 started on CPU 1
     153[HW][I][SCHED][eNB] eNB RX thread 8 started on CPU 0
     154[HW][I][SCHED] eNB TX thread 9 started on CPU 0
     155[HW][I][SCHED][eNB] eNB RX thread 9 started on CPU 1
     156Creating main eNB_thread
     157[SCHED][eNB] Started eNB main thread on CPU 4
     158eNB_thread: mlockall in ...
     159eNB_thread: mlockall out ...
     160waiting for sync (eNB_thread)
     161TYPE <CTRL-C> TO TERMINATE
     162Entering ITTI signals handler
     163
     164}}}
     165[[CollapsibleEnd]]
     166
     167
     168==== The command line parameters of lte-softmodem ====
     169Relevant (i.e. for USRP command line parameters for the lte-softmodem command are:
     170 * -O file: eNB configuration file (this is the preferred way to pass basic parameters and there are several examples in $OPENAIR_TARGETS/PROJECTS/GENERIC-LTE_EPC/CONF/
     171 * -g LEVEL: set the level of debug for the log generation (-g7 is quite high and useful to trace bugs in the procedures/protocols, -g9 even dumps packets at all levels of the protocol stack)
     172 * -d: enables xforms signal tracer
     173 * -U: start as UE (default: eNB)
     174 * -C freq: set carrier frequency to f0 for all chains (extension to independent frequencies trivial)
     175 * -V: enables the VCD debugging tool (this is a temporal event tracer, which is useful for real-time debugging using GTKWave)
     176 * -K file: ITTI logfile. ITTI is an intertask tracing utility which helps debugging with an EPC. It can traces all exchanges between RRC<->S1AP, RRC<->PDCP, PDCP<->S1
     177 * -S: do not exit for the missing slots, instead increment the counter.
     178 * --debug-ue-prach: only send prach but do not connect
     179 * --no-L2-connect: only runs rx, does not send prach
     180
     181More details on running lte-softmodem are available on [https://twiki.eurecom.fr/twiki/bin/view/OpenAirInterface/OpenAirLXRT OpenAirInterface real-time LTE softmodem page].