Changes between Version 31 and Version 32 of Tutorials/g0WmLTE/Tutorial4-OAI


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Timestamp:
Dec 1, 2016, 5:10:50 AM (8 years ago)
Author:
seskar
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  • Tutorials/g0WmLTE/Tutorial4-OAI

    v31 v32  
    11== !OpenAirInterface LTE Tutorials ==
     2
     3[[TOC(noheading, Tutorials/g0WmLTE*, depth=3)]]
    24
    35[[Include(Documentation/Short/Prereq)]]
    46
    5 This tutorial also assumes basic familiarity with [http://en.wikipedia.org/wiki/LTE_%28telecommunication%29 LTE standard]. It uses [http://www.openairinterface.org/ OpenAirInterface] open source software implementation of LTE basestation (eNodeB or eNB) and modem (user equipment or UE) developed at [http://www.eurecom.fr/en Eurecom]. The tutorial given here is based on the [https://twiki.eurecom.fr/twiki/bin/view/OpenAirInterface/OpenAirLXRT OAI_real-time_LTEsoftmodem] tutorial.
     7This set of tutorials also assumes basic familiarity with [http://en.wikipedia.org/wiki/LTE_%28telecommunication%29 LTE standard]. They are using [http://www.openairinterface.org/ OpenAirInterface] open source software implementation of LTE basestation (eNodeB or eNB) and modem (user equipment or UE) developed at [http://www.eurecom.fr/en Eurecom].
    68
    7 The image used for this experiment is oai-trunk-head.ndz. Image uses Ubunutu 14.04 and has low-latency 3.19 kernel install and UHD drivers needed for B210/X310 USRPs (UHD 3.8.2)). This image was derived from vanilla image ubuntu-14-04-64bit-3.19-lowlatency.ndz (that was created based on [https://gitlab.eurecom.fr/oai/openairinterface5g/wikis/OpenAirKernelMainSetup OpenAir instructions]) from ubutbu-14-04-64bit.ndz (baseline.ndz). In addition to installation steps in !OpenAir documentation, once low latency kernel was installed, [wiki:Software/hDrivers drivers for Broadcom and Netgear devices] had to be manually re-installed.
     9The images used for these experiment are based on Ubunutu 14.04 and have low-latency 3.19 kernel (that was created based on [https://gitlab.eurecom.fr/oai/openairinterface5g/wikis/OpenAirKernelMainSetup OpenAir instructions]) from ubutbu-14-04-64bit.ndz (baseline.ndz). In addition to installation steps in !OpenAir documentation, once low latency kernel was installed, [wiki:Software/hDrivers drivers for Broadcom and Netgear devices] had to be manually re-installed.
    810
    911Two images were created based on [https://gitlab.eurecom.fr/oai/openairinterface5g/wikis/GetSources git cloning instructions] and [https://gitlab.eurecom.fr/oai/openairinterface5g/wikis/AutoBuild compiling instructions]:
    1012
    1113 * '''oai-master.ndz''' - master branch clone from git in /root
    12 
    1314 * '''oai-develop.ndz''' - develop branch clone from git in /root
    1415
     
    1718Update for '''oai-develop.ndz''': The openair-cn (EPC) was installed with default passwords of '''oai''' and default choice of "Y" for optional packages (freeDiameter, asn1c pach and xtables_addons_oai). xtables_addons_oai was pulled out of git and installed.
    1819
    19 ------------------------------
     20==== Build and Execution Scripts ===
    2021
    21 The code was compiled with USRP support i.e. with:
    22 {{{
    23 cd trunk/targets/bin; build_oai.bash -l ENB -c -w USRP
    24 }}}
    25 More details on various build options are available on [https://twiki.eurecom.fr/twiki/bin/view/OpenAirInterface/AutoBuild OpenAirInterface build page].
     22Scripts are available to compile and execute components...
    2623
    27 In this tutorial we will use nodes with USRP b310 and have the basestation on node9-1 and modem on node6-20.
     24==== OAI Tutorials ====
     25The following basic tutorials based of the OAI source code are available:
     26  * [wiki:./Tutorial0 Basis OAI Tutorial]
     27  * [wiki:./Tutorial1 T1]
     28  * [wiki:./Tutorial2 T0]
    2829
    29 
    30 
    31 
    32 === Prepare the nodes ===
    33 
    34  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]]
    35  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]]
    36 
    37 === Execute the experiment ===
    38 
    39 Primary objective is to establish the LTE connection between the UE and eNB. In order to that we need to prepare configuration files on two nodes: node9-1 and node6-20.
    40   1. '''ssh into nodes:''' Open the two ssh sessions from the console to the two nodes
    41 || [[Image(node9-1.png, width=200)]] || [[Image(node6-20.png, width=200)]] ||
    42   2. '''Prepare configuration files:''' Make sure to have correct parameters in oai.conf file in roots home directory on the node (/root) as follows:
    43      i. Operating frequency band parameters:
    44           a. E-UTRA band
    45           b. Corresponding duplex mode (e.g. FDD/TDD),
    46           c. Downlink frequency [Hz], uplink frequency offset [Hz] (which is given in reference to the downlink frequency).
    47           d. LTE bandwidth: N_RB_DL = {6,15,25,50,75,100} corresponding to bandwidth = {1.4,3,5,10,15,20} MHz
    48           For example:
    49           {{{
    50     ////////// Physical parameters:
    51     component_carriers = (
    52                          {
    53                            frame_type                                         = "FDD";
    54                            eutra_band                                         = 7;
    55                            downlink_frequency                                 = 2660000000L;
    56                            uplink_frequency_offset                            = -120000000;
    57                            N_RB_DL                                            = 25; #N_RB_DL choice: 6,15,25,50,75,100
    58                          }
    59                          );
    60           }}}
    61           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.
    62 
    63           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
    64 
    65      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):
    66      {{{
    67     ////////// MME parameters:
    68     mme_ip_address      = ( { ipv4       = "10.10.0.100";
    69                               ipv6       = "10:10:0::100";
    70                               active     = "no";
    71                               preference = "ipv4";
    72                             }
    73                           );
    74 
    75     NETWORK_INTERFACES :
    76     {
    77         ENB_INTERFACE_NAME_FOR_S1_MME            = "eth1";
    78         ENB_IPV4_ADDRESS_FOR_S1_MME              = "10.10.9.1/24";
    79 
    80         ENB_INTERFACE_NAME_FOR_S1U               = "eth1";
    81         ENB_IPV4_ADDRESS_FOR_S1U                 = "10.10.9.1/24";
    82         ENB_PORT_FOR_S1U                         = 2152; # Spec 2152
    83     };
    84      }}}
    85   3. '''Run the lte-softmodem:''' Depending on whether you want to run it with or without mme, execute lte-softmodem on corresponding nodes:
    86 
    87  || || On the eNB node (node9-1) || On the UE node (node6-20)  ||
    88  || w/o MME || {{{ lte-softmodem-nomme -Ooai.conf -V}}} || {{{ lte-softmodem -U -Ooai.conf -C 2660000000 -V}}} ||
    89  || w MME || {{{ lte-softmodem -Ooai.conf -V}}} || {{{ lte-softmodem -U -Ooai.conf -C 2660000000 -V}}} ||
    90 
    91 If 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).
    92 [[Image(Scope.png, width=300)]] ||
    93 
    94 [[CollapsibleStart(The output on both consoles should look something like this:)]]
    95 {{{
    96 [RRC][I][eNB 0] Init (UE State = RRC_IDLE)...
    97 [RRC][I][eNB 0] Checking release
    98 [RRC][I][eNB 0] Rel8 RRC
    99 [RRC][I][eNB 0] Configuration SIB2/3
    100 [MAC][I][rrc_mac_config_req] [CONFIG][eNB 0] Configuring MAC/PHY
    101 [MAC][I][rrc_mac_config_req] [CONFIG]SIB2/3 Contents (partial)
    102 [MAC][I][rrc_mac_config_req] [CONFIG]pusch_config_common.n_SB = 1
    103 [MAC][I][rrc_mac_config_req] [CONFIG]pusch_config_common.hoppingMode = 0
    104 [MAC][I][rrc_mac_config_req] [CONFIG]pusch_config_common.pusch_HoppingOffset = 0
    105 [MAC][I][rrc_mac_config_req] [CONFIG]pusch_config_common.enable64QAM = 0
    106 [MAC][I][rrc_mac_config_req] [CONFIG]pusch_config_common.groupHoppingEnabled = 1
    107 [MAC][I][rrc_mac_config_req] [CONFIG]pusch_config_common.groupAssignmentPUSCH = 0
    108 [MAC][I][rrc_mac_config_req] [CONFIG]pusch_config_common.sequenceHoppingEnabled = 0
    109 [MAC][I][rrc_mac_config_req] [CONFIG]pusch_config_common.cyclicShift  = 1
    110 [RRC][I][eNB 0] OPENAIR RRC IN....
    111 [SCTP][I][sctp_handle_new_association_req] Setsockopt SOL_SOCKET socket bound to : eth1
    112 [SCTP][I][sctp_handle_new_association_req] Converted ipv4 address 10.10.0.100 to network type
    113 [SCTP][I][sctp_handle_new_association_req] connectx assoc_id  1 in progress..., used 1 addresses
    114 [SCTP][I][sctp_handle_new_association_req] Inserted new descriptor for sd 56 in list, nb elements 1, assoc_id 1
    115 [SCTP][I][sctp_eNB_flush_sockets] Found data for descriptor 56
    116 [SCTP][I][sctp_eNB_read_from_socket] Received notification for sd 56, type 32769
    117 [SCTP][I][sctp_eNB_read_from_socket] Client association changed: 0
    118 [SCTP][I][sctp_get_peeraddresses] ----------------------
    119 [SCTP][I][sctp_get_peeraddresses] Peer addresses:
    120 [SCTP][I][sctp_get_peeraddresses]     - [10.10.0.100]
    121 [SCTP][I][sctp_get_peeraddresses] ----------------------
    122 [SCTP][I][sctp_get_sockinfo] ----------------------
    123 [SCTP][I][sctp_get_sockinfo] SCTP Status:
    124 [SCTP][I][sctp_get_sockinfo] assoc id .....: 1
    125 [SCTP][I][sctp_get_sockinfo] state ........: 3
    126 [SCTP][I][sctp_get_sockinfo] instrms ......: 8
    127 [SCTP][I][sctp_get_sockinfo] outstrms .....: 64
    128 [SCTP][I][sctp_get_sockinfo] fragmentation : 1452
    129 [SCTP][I][sctp_get_sockinfo] pending data .: 0
    130 [SCTP][I][sctp_get_sockinfo] unack data ...: 0
    131 [SCTP][I][sctp_get_sockinfo] rwnd .........: 106496
    132 [SCTP][I][sctp_get_sockinfo] peer info     :
    133 [SCTP][I][sctp_get_sockinfo]     state ....: 2
    134 [SCTP][I][sctp_get_sockinfo]     cwnd .....: 4380
    135 [SCTP][I][sctp_get_sockinfo]     srtt .....: 0
    136 [SCTP][I][sctp_get_sockinfo]     rto ......: 3000
    137 [SCTP][I][sctp_get_sockinfo]     mtu ......: 1500
    138 [SCTP][I][sctp_get_sockinfo] ----------------------
    139 [SCTP][I][sctp_eNB_read_from_socket] Comm up notified for sd 56, assigned assoc_id 1
    140 [S1AP][I][s1ap_eNB_generate_s1_setup_request] 3584 -> 00e000
    141 [SCTP][I][sctp_send_data] Successfully sent 53 bytes on stream 0 for assoc_id 1
    142 [SCTP][I][sctp_eNB_flush_sockets] Found data for descriptor 56
    143 [SCTP][I][sctp_eNB_read_from_socket] Received notification for sd 56, type 32777
    144 [SCTP][I][sctp_eNB_flush_sockets] Found data for descriptor 56
    145 [SCTP][I][sctp_eNB_read_from_socket] [1][56] Msg of length 27 received from port 36412, on stream 0, PPID 18
    146 [S1AP][I][s1ap_decode_s1ap_s1setupresponseies] Decoding message S1ap_S1SetupResponseIEs (/root/trunk/targets/RT/USER/objs/openair-cn/S1AP/s1ap_decoder.c:3544)
    147 [ENB_APP][I][eNB_app_task] [eNB 0] Received S1AP_REGISTER_ENB_CNF: associated MME 1
    148 Waiting for eNB application to be ready
    149 [HW][I][SCHED] eNB TX thread 0 started on CPU 5
    150 [HW][I][SCHED][eNB] eNB RX thread 0 started on CPU 0
    151 [HW][I][SCHED] eNB TX thread 1 started on CPU 0
    152 [HW][I][SCHED][eNB] eNB RX thread 1 started on CPU 5
    153 [HW][I][SCHED] eNB TX thread 2 started on CPU 2
    154 [HW][I][SCHED][eNB] eNB RX thread 2 started on CPU 0
    155 [HW][I][SCHED] eNB TX thread 3 started on CPU 5
    156 [HW][I][SCHED][eNB] eNB RX thread 3 started on CPU 5
    157 [HW][I][SCHED] eNB TX thread 4 started on CPU 4
    158 [HW][I][SCHED][eNB] eNB RX thread 4 started on CPU 1
    159 [HW][I][SCHED] eNB TX thread 5 started on CPU 4
    160 [HW][I][SCHED][eNB] eNB RX thread 5 started on CPU 4
    161 [HW][I][SCHED] eNB TX thread 6 started on CPU 0
    162 [HW][I][SCHED][eNB] eNB RX thread 6 started on CPU 1
    163 [HW][I][SCHED] eNB TX thread 7 started on CPU 1
    164 [HW][I][SCHED][eNB] eNB RX thread 7 started on CPU 0
    165 [HW][I][SCHED] eNB TX thread 8 started on CPU 1
    166 [HW][I][SCHED][eNB] eNB RX thread 8 started on CPU 0
    167 [HW][I][SCHED] eNB TX thread 9 started on CPU 0
    168 [HW][I][SCHED][eNB] eNB RX thread 9 started on CPU 1
    169 Creating main eNB_thread
    170 [SCHED][eNB] Started eNB main thread on CPU 4
    171 eNB_thread: mlockall in ...
    172 eNB_thread: mlockall out ...
    173 waiting for sync (eNB_thread)
    174 TYPE <CTRL-C> TO TERMINATE
    175 Entering ITTI signals handler
    176 
    177 }}}
    178 [[CollapsibleEnd]]
    179 
    180 
    181 === The command line parameters of lte-softmodem ===
    182 Relevant (i.e. for USRP command line parameters for the lte-softmodem command are:
    183  * -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/
    184  * -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)
    185  * -d: enables xforms signal tracer
    186  * -U: start as UE (default: eNB)
    187  * -C freq: set carrier frequency to f0 for all chains (extension to independent frequencies trivial)
    188  * -V: enables the VCD debugging tool (this is a temporal event tracer, which is useful for real-time debugging using GTKWave)
    189  * -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
    190  * -S: do not exit for the missing slots, instead increment the counter.
    191  * --debug-ue-prach: only send prach but do not connect
    192  * --no-L2-connect: only runs rx, does not send prach
    193 
    194 More details on running lte-softmodem are available on [https://twiki.eurecom.fr/twiki/bin/view/OpenAirInterface/OpenAirLXRT OpenAirInterface real-time LTE softmodem page].