Konfigurasi Core Network 4G

Langkah yang perlu dilakukan untuk mengkonfigurasi core network 4G yang menggunakan open5gs adalah mengikuti langkah-langkah berikut,

Edit File mme.yaml menggunakan nano

nano /etc/open5gs/mme.yaml

s1ap:
      - addr: 192.168.100.236
    gtpc:
      - addr: 127.0.0.2
    metrics:
      addr: 127.0.0.2
      port: 9090
    gummei:
      plmn_id:
        mcc: 510
        mnc: 33
      mme_gid: 2
      mme_code: 1
    tai:
      plmn_id:
        mcc: 510
        mnc: 33
      tac: 1

Beberapa parameter yang dapat kita lihat di atas dengan penjelasannya adalah sebagai berikut, S1AP S1 Application Protocol S1AP is used between the eNB and the MME in order to support operations such as E-RAB (E-UTRAN Radio Access Bearer) Management, transfer of UE Context information, NAS Signalling transport, Paging and EPC based mobility.

Tracking Area

Tracking Area is a logical concept of an area where a user can move around without updating the MME. The network allocates a list with one or more TAs to the user. In certain operation modes, the UE may move freely in all TAs of the list without updating the MME. You can think of 'Tracking Area' as 'Routing Area' in UMTS.

Each eNobe broadcasts a special tracking area code (TAC) to indicate to which Tracking Area the eNodeB belong to and the TAC is unique within a PLMN. (Since PLMN is a unique number allocated to each of the system operator and TAC is a unique in a PLMN, if you combine these two numbers you would have a globally unique number. This number (PLMN + TAC) is called Tracking Area Identity (TAI)

UE stores a group of TAC and this group of TAC maintained in a UE is called Tracking Area List. UE does not need to go through Tracking Area Update procedure when it moves along this TAI.

Tracking Area Codes (TACs) or TAs: it is group of eNodeBs in one small area with maximum number of 100 eNodeBs. TAC and TAL planning is to determine the size of a TAC and TAL border. The TAC and TAL size is simply defined as the number of eNodeBs in the TAC or TACs in a TAL.

Public Land Mobile Network Identifier or with abbreviated version PLMN is a combination of MCC and MNC. It is unique value and globally used to identify the mobile network that a user subscribed.

MCC: Mobile Country Code is used in wireless telephone networks such as GSM, CDMA, WCDMA or LTE in order to identify mobile user belongs to which country. MCC consists of 3 decimal digits.

Restart mme menggunakan perintah,

sudo systemctl restart open5gs-mmed
tail -f /var/log/open5gs/mme.log

Perintah tail log, biasanya kita ketik untuk memonitor aktifitas yang terjadi di MME. Di windows yang lain, kita dapat mengedit File sgwu.yaml menggunakan nano

nano /etc/open5gs/sgwu.yaml

sgwu:
    pfcp:
      - addr: 127.0.0.6
    gtpu:
      - addr: 192.168.100.236

Restart sgwu menggunakan perintah,

sudo systemctl restart open5gs-sgwud
tail -f /var/log/open5gs/sgwu.log

Perintah tail log, biasanya kita ketik untuk memonitor aktifitas yang terjadi di SGWU.

GTPU

 GTP-U PROTOCOL

 PROTOCOL DESCRIPTION
 The GPRS Tunnelling Protocol (GTP) is a group of IP-based communications protocols used within GSM, UMTS, LTE and 5G NR radio networks. GTP-U is used to 
 carry user data inside mobile networks.

PFCP

 Packet Forwarding Control Protocol (PFCP) is a 3GPP protocol used on the Sx/N4 interface between the control plane and the user plane function, 
 specified in TS 29.244.[1] It is one of the main protocols introduced in the 5G Next Generation Mobile Core Network (aka 5GC[2]), but also used in the 
 4G/LTE EPC to implement the Control and User Plane Separation (CUPS).[3] PFCP and the associated interfaces seek to formalize the interactions between 
 different types of functional elements used in the Mobile Core Networks as deployed by most operators providing 4G, as well as 5G, services to mobile 
 subscribers

Pranala Menarik

• 5G