注意，最新开发版本的代码不稳定，存在问题，以下的仅仅是记录自己的操作过程，代码并不能正常工作。正常使用的话，请不要使用如下的版本操作。
参考ubuntu 16.04系统LimeSDR V1.4使用OpenAirInterface搭建LTE实验环境，并参考 解决ubuntu 16.04系统上2017.06版本之后的LimeSDR V1.4驱动不能正常运行OpenAirInterface搭建的LTE实验环境的问题使用最新的LimeSDR驱动能正常进行LTE实验之后，我们开始尝试把OpenAirInterface的代码更新到最新版本（2018_w15),新版本的代码结构更加清晰，但是不可用。
$ cd ~ $ cd openairinterface5g $ rm -rf * $ git checkout develop $ git pull #对于国内的用户来说，国外的几个代码地址需要修改一下，否则会出现无法下载或者下载非常慢的情况 $ sed -i "s/git clone https:\/\/gist.github.com\/2190472.git \/opt\/ssh/wget https:\/\/www.mobibrw.com\/wp-content\/uploads\/2018\/03\/ssh.tar.gz \&\& sudo tar -zxvf ssh.tar.gz -C \/opt/g" cmake_targets/tools/build_helper $ sed -i "s/git clone https:\/\/gitlab.eurecom.fr\/oai\/asn1c.git \/tmp\/asn1c/wget https:\/\/www.mobibrw.com\/wp-content\/uploads\/2018\/03\/asn1c.tar.gz \&\& tar -zxvf asn1c.tar.gz -C \/tmp/g" cmake_targets/tools/build_helper $ sed -i "s/https:\/\/pypi.python.org\/packages\/18\/fa\/dd13d4910aea339c0bb87d2b3838d8fd923c11869b1f6e741dbd0ff3bc00\/netifaces-0.10.4.tar.gz/https:\/\/www.mobibrw.com\/wp-content\/uploads\/2018\/03\/netifaces-0.10.4.tar.gz/g" cmake_targets/tools/build_helper $ sed -i "s/https:\/\/github.com\/google\/protobuf\/releases\/download\/v3.3.0\/protobuf-cpp-3.3.0.tar.gz/https:\/\/www.mobibrw.com\/wp-content\/uploads\/2018\/04\/protobuf-cpp-3.3.0.tar.gz/g" cmake_targets/tools/build_helper $ sed -i "s/git clone https:\/\/github.com\/protobuf-c\/protobuf-c.git/wget https:\/\/www.mobibrw.com\/wp-content\/uploads\/2018\/03\/protobuf-c.tar.gz \&\& tar -zxvf protobuf-c.tar.gz/g" cmake_targets/tools/build_helper #修正兼容问题，更高版本的protobuf-c跟我们上面安装的版本不匹配，会导致编译错误 $ sed -i "s/cd protobuf-c/cd protobuf-c \&\& git checkout 2a46af42784abf86804d536f6e0122d47cfeea45/g" cmake_targets/tools/build_helper # 如果使用最新版本的limesdr驱动已经修正了数据读取的BUG,不需要丢弃第一次的报文，我们需要 # 阻止第一个报文的丢弃，否则数据读取是错误的 $ sed -r -i "s/first_rx[ \t]*=[ \t]*1;/first_rx = 0;/g" targets/ARCH/LMSSDR/USERSPACE/LIB/lms_lib.cpp #执行编译 $ source oaienv $ ./cmake_targets/build_oai -I # install SW packages from internet # ./cmake_targets/build_oai -w USRP --eNB -t ETHERNET# compile eNB # 注意如果后续重新编译过limesdr的驱动，这部分也需要重新编译 $ ./cmake_targets/build_oai -c -w LMSSDR --eNB -x
接下来就是创建LimeSDR的启动配置文件（从enb.band7.tm1.50PRB.usrpb210.conf修改而来）：
$ vim targets/PROJECTS/GENERIC-LTE-EPC/CONF/enb.band7.tm1.25PRB.lmssdr.conf
里面的内容如下：
Active_eNBs = ( "eNB-Eurecom-LTEBox");
# Asn1_verbosity, choice in: none, info, annoying
Asn1_verbosity = "none";
eNBs =
(
{
////////// Identification parameters:
eNB_ID = 0xe00;
cell_type = "CELL_MACRO_ENB";
eNB_name = "eNB-Eurecom-LTEBox";
// Tracking area code, 0x0000 and 0xfffe are reserved values
tracking_area_code = "1";
mobile_country_code = "208";
mobile_network_code = "92";
tr_s_preference = "local_mac"
////////// Physical parameters:
component_carriers = (
{
node_function = "3GPP_eNODEB";
node_timing = "synch_to_ext_device";
node_synch_ref = 0;
frame_type = "FDD";
tdd_config = 3;
tdd_config_s = 0;
prefix_type = "NORMAL";
eutra_band = 7;
downlink_frequency = 2685000000L;
uplink_frequency_offset = -120000000;
Nid_cell = 0;
N_RB_DL = 25;
Nid_cell_mbsfn = 0;
nb_antenna_ports = 1;
nb_antennas_tx = 1;
nb_antennas_rx = 1;
tx_gain = 90;
rx_gain = 125;
pbch_repetition = "FALSE";
prach_root = 0;
prach_config_index = 0;
prach_high_speed = "DISABLE";
prach_zero_correlation = 1;
prach_freq_offset = 2;
pucch_delta_shift = 1;
pucch_nRB_CQI = 0;
pucch_nCS_AN = 0;
pucch_n1_AN = 32;
pdsch_referenceSignalPower = -27;
pdsch_p_b = 0;
pusch_n_SB = 1;
pusch_enable64QAM = "DISABLE";
pusch_hoppingMode = "interSubFrame";
pusch_hoppingOffset = 0;
pusch_groupHoppingEnabled = "ENABLE";
pusch_groupAssignment = 0;
pusch_sequenceHoppingEnabled = "DISABLE";
pusch_nDMRS1 = 1;
phich_duration = "NORMAL";
phich_resource = "ONESIXTH";
srs_enable = "DISABLE";
/* srs_BandwidthConfig =;
srs_SubframeConfig =;
srs_ackNackST =;
srs_MaxUpPts =;*/
pusch_p0_Nominal = -96;
pusch_alpha = "AL1";
pucch_p0_Nominal = -104;
msg3_delta_Preamble = 6;
pucch_deltaF_Format1 = "deltaF2";
pucch_deltaF_Format1b = "deltaF3";
pucch_deltaF_Format2 = "deltaF0";
pucch_deltaF_Format2a = "deltaF0";
pucch_deltaF_Format2b = "deltaF0";
rach_numberOfRA_Preambles = 64;
rach_preamblesGroupAConfig = "DISABLE";
/*
rach_sizeOfRA_PreamblesGroupA = ;
rach_messageSizeGroupA = ;
rach_messagePowerOffsetGroupB = ;
*/
rach_powerRampingStep = 4;
rach_preambleInitialReceivedTargetPower = -108;
rach_preambleTransMax = 10;
rach_raResponseWindowSize = 10;
rach_macContentionResolutionTimer = 48;
rach_maxHARQ_Msg3Tx = 4;
pcch_default_PagingCycle = 128;
pcch_nB = "oneT";
bcch_modificationPeriodCoeff = 2;
ue_TimersAndConstants_t300 = 1000;
ue_TimersAndConstants_t301 = 1000;
ue_TimersAndConstants_t310 = 1000;
ue_TimersAndConstants_t311 = 10000;
ue_TimersAndConstants_n310 = 20;
ue_TimersAndConstants_n311 = 1;
ue_TransmissionMode = 1;
}
);
srb1_parameters :
{
# timer_poll_retransmit = (ms) [5, 10, 15, 20,... 250, 300, 350, ... 500]
timer_poll_retransmit = 80;
# timer_reordering = (ms) [0,5, ... 100, 110, 120, ... ,200]
timer_reordering = 35;
# timer_reordering = (ms) [0,5, ... 250, 300, 350, ... ,500]
timer_status_prohibit = 0;
# poll_pdu = [4, 8, 16, 32 , 64, 128, 256, infinity(>10000)]
poll_pdu = 4;
# poll_byte = (kB) [25,50,75,100,125,250,375,500,750,1000,1250,1500,2000,3000,infinity(>10000)]
poll_byte = 99999;
# max_retx_threshold = [1, 2, 3, 4 , 6, 8, 16, 32]
max_retx_threshold = 4;
}
# ------- SCTP definitions
SCTP :
{
# Number of streams to use in input/output
SCTP_INSTREAMS = 2;
SCTP_OUTSTREAMS = 2;
};
////////// MME parameters:
mme_ip_address = ( { ipv4 = "127.0.0.20";
ipv6 = "192:168:30::17";
active = "yes";
preference = "ipv4";
}
);
NETWORK_INTERFACES :
{
ENB_INTERFACE_NAME_FOR_S1_MME = "lo";
ENB_IPV4_ADDRESS_FOR_S1_MME = "127.0.0.10/8";
ENB_INTERFACE_NAME_FOR_S1U = "lo";
ENB_IPV4_ADDRESS_FOR_S1U = "127.0.0.10/8";
ENB_PORT_FOR_S1U = 2152; # Spec 2152
};
}
);
MACRLCs = (
{
num_cc = 1;
tr_s_preference = "local_L1";
tr_n_preference = "local_RRC";
phy_test_mode = 1;
}
);
L1s = (
{
num_cc = 1;
tr_n_preference = "local_mac";
}
);
RUs = (
{
local_rf = "yes"
nb_tx = 1
nb_rx = 1
att_tx = 0
att_rx = 0;
bands = [7];
max_pdschReferenceSignalPower = -27;
max_rxgain = 125;
eNB_instances = [0];
}
);
NETWORK_CONTROLLER :
{
FLEXRAN_ENABLED = "no";
FLEXRAN_INTERFACE_NAME = "lo";
FLEXRAN_IPV4_ADDRESS = "127.0.0.1";
FLEXRAN_PORT = 2210;
FLEXRAN_CACHE = "/mnt/oai_agent_cache";
FLEXRAN_AWAIT_RECONF = "no";
};
log_config :
{
global_log_level ="info";
global_log_verbosity ="medium";
hw_log_level ="info";
hw_log_verbosity ="medium";
phy_log_level ="info";
phy_log_verbosity ="medium";
mac_log_level ="info";
mac_log_verbosity ="high";
rlc_log_level ="info";
rlc_log_verbosity ="medium";
pdcp_log_level ="info";
pdcp_log_verbosity ="medium";
rrc_log_level ="info";
rrc_log_verbosity ="medium";
};
另外，最新版本运行的时候如果增加-d参数，启动图形界面，程序会崩溃。目前这个版本可以运行，但是貌似会导致LimeSDR驱动数据发送异常，目前已知，这个版本的驱动没有正确的读取配置文件，导致给硬件的配置信息是错误的，暂时这个版本还不可用。