LTE Handover Feature in L2simulator

Introduction These changes include updating the node number mechanism where eNB 1, 2 etc. start from 1 instead of the UEs. Additionally, resetting the PDCP and RLC configuration after the UE switches to the target eNB functionality was added. Lastly new configurations and tracking of multiple eNB's and channel condition reporting to trigger HO was implemented.

Setup

Get the source code from OAI

git clone https://gitlab.eurecom.fr/oai/openairinterface5g.git

Checkout episys-lte-ho branch.

cd openairinterface5g
git checkout episys-lte-ho

The following environment variables refer to the paths for the openairinterface5g and Multi-Ue-Proxy repo locations; the paths to these folders will be referred to as<PATHTOOAI> and <PATHTOPROXY> respectively.

• <PATHTOOAI> = /path/to/current/directory/openairinterface5g
• <PATHTOPROXY> = /path/to/current/directory/multi-ue-proxy

cd <PATHTOOAI>
source oaienv
cd cmake_targets/
./build_oai --eNB --UE -c

OAI eNB Source

sudo -E ./ran_build/build/lte-softmodem -O ../ci-scripts/conf_files/episci/proxy_rcc.band7.tm1.nfapi.conf \
 --noS1 --node-number 1 --emulate-l1 \
 --log_config.global_log_options level,nocolor,time,thread_id | tee eNB.log 2>&1

OAI eNB Target

sudo -E ./ran_build/build/lte-softmodem -O ../ci-scripts/conf_files/episci/proxy_rcc.band7.tm1.nfapi_target.conf \
 --noS1 --node-number 2 --emulate-l1 \
 --log_config.global_log_options level,nocolor,time,thread_id | tee eNB2.log 2>&1

Multi-Ue-Proxy

git clone https://github.com/EpiSci/oai-lte-5g-multi-ue-proxy.git

cd <PATHTOPROXY>

git checkout master

make -j<number-of-jobs>

number-of-jobs can be based on the number of cores in your PC.

sudo -E ./build/proxy 1 --lte_handover

OAI UE

cd <PATHTOOAI>
source oaienv
cd cmake_targets/

sudo -E ./ran_build/build/lte-uesoftmodem -O ../ci-scripts/conf_files/episci/proxy_ue.nfapi.conf \
 --L2-emul 5 --nokrnmod 1 --noS1 --num-ues 1 --node-number 1 --num-enbs 2 \
 --log_config.global_log_options level,nocolor,time,thread_id | tee UE.log 2>&1

USE TEST SCRIPT (ALTERNATIVE TO ABOVE)

cd <PATHTOPROXY>
./proxy_testscript.py -u 1 --mode lte_handover