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1. [Analyzing X2 Handover in LTE/LTE-A using OpenAirInterface system emulator](http://www.eurecom.fr/en/publication/4854/download/comsys-publi-4854.pdf)
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1. [NMC LTE X2 Handover](http://www.3glteinfo.com/wp-content/uploads/2013/12/NMC.LTE-X2-Handover.v1.0.pdf)
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The code is merged into `develop`.
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The code is merged into `develop` since early 2019 and is now available into the `master` branch since tag **`v1.1.0`**.
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## X2 Control Plane (X2-CP) ##
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LTE X2-CP is operating over SCTP as the transport layer protocol which is similar to the LTE S1-CP protocol. Currently, the X2-CP is based on **3GPP 36.423** v14.6.0 and implements the following functions:
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In the proposed setup, different possible deployed scenarios can be considered for experimentation, e.g., successful/failed HO based on UE’s emulated mobility as well as different OAI network measurements, e.g., packet loss, delay, RSRP/RSRQ etc.
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## Build and Run ##
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Working X2 configuration files: [Master eNB: master.conf](how-to-perform-a-x2-ho/enb.band7.tm1.25PRB.usrpb210.master.conf), [Slave eNB: slave.conf](how-to-perform-a-x2-ho/enb.band7.tm1.25PRB.usrpb210.slave.conf) (IP address of master: 10.64.45.62, IP address of slave: 10.64.45.63, IP address of MME: 10.64.93.19)
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Working X2 configuration files:
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* [Master eNB: master.conf](how-to-perform-a-x2-ho/enb.band7.tm1.25PRB.usrpb210.master.conf),
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* [Slave eNB: slave.conf](how-to-perform-a-x2-ho/enb.band7.tm1.25PRB.usrpb210.slave.conf)
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- IP address of master: `10.64.45.62`,
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- IP address of slave: `10.64.45.63`,
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- IP address of MME: `10.64.93.19`
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You can also use the configuration files used by the Continuous Integration process:
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* [Master eNB Configuration file](https://gitlab.eurecom.fr/oai/openairinterface5g/blob/master/ci-scripts/conf_files/enb.band13.tm1.25PRB.usrpb210.conf)
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* [Slave eNB Configuration file](https://gitlab.eurecom.fr/oai/openairinterface5g/blob/master/ci-scripts/conf_files/enb.slave.band13.tm1.25PRB.usrpb210.conf)
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**CAUTION** : these CI files have the following markers to be modified with proper IP addresses:
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* `CI_MME_IP_ADDR` with the EPC server IP address
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* `CI_ENB_IP_ADDR` with the eNB server IP address (one for the master and one for the slave)
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* `CI_RCC_IP_ADDR` with the master eNB server IP address
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* Enable or Disable FlexRan Ctrl --> `FLEXRAN_ENABLED = "yes/no";`
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Build the 2 eNBs (Master/Slave) in two different machines as:
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```bash
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