IPRAN is currently a technology commonly used in LTE networks. It can provide functions such as large bandwidth, high QoS guarantee, and perfect OAM, and can well meet the needs of LTE data backhaul. PON technology is a one-point-to-multipoint topology structure. Its optical fiber quantity requirements and laying costs are greatly reduced compared with traditional point-to-point structures or ring structures. Therefore, PON and mobile access networks especially use PON to carry digital indoor services. It can reduce the investment cost of the mobile access network and increase the profit of the operator.
With the advent of the mobile payment era, changes in user behavior have put forward higher requirements for the network, and the problem of insufficient indoor coverage of 4G networks in major commercial buildings has gradually been exposed. The solution for indoor 4G network blindness supplementation by small and micro stations based on PON networks , quickly and effectively solve the problem of indoor weak coverage or no coverage, improve user perception, and reduce the risk of complaints.
1 Advantages of small and micro stations
Compared with the traditional DAS system, small and micro stations have the following advantages in solving indoor 4G network blind fill:
(1) Enhancement of traffic hotspots: The capacity of traffic hotspots is increased locally and accurately, the small micro-stations are moved forward to the user end, and hotspot users exclusively enjoy the carrier bandwidth, which significantly improves user speed and usage perception.
(2) Fixed-mobile convergence: use the abundant PON resources of the telecom network to realize fixed-mobile convergence.
(3) Lower cost: Utilize the PON resource transmission available everywhere to reduce wiring costs, customize micro-stations with milliwatt level and low number of users, and greatly reduce costs while meeting business needs.
(4) Quick installation: realize PON access, realize Internet access (PON or LAN) after deploying the gateway, fast deployment, the station can be opened in half an hour, parameters are automatically configured, no manual intervention is required, plug and play.
(5) Controllable and manageable: Deploy network management and connect to integrated network management through northbound interfaces to realize controllable network elements and automatic fault dispatching.
2 SmallCell main functions:
(1) Support 4G signal coverage
(2) Support LTE FDD Band1 (1 800 MHz frequency band), Band3 (2 100 MHz frequency band)
(3) Output power 2×125 mW
(4) Support VoLTE HD voice and video
(5) Support mobility management functions such as same-frequency/different-frequency handover and reselection within the system
(6) Support connecting PON, IP-RAN and other transmission networks to access the core network through Ethernet electrical ports or optical ports
(7) Possess complete network management functions such as software remote upgrade, remote monitoring, alarm and KPI reporting.
3 Networking methods
(1) PON-IPRAN access
Networking instructions:
Connect the A equipment located in the same computer room with the OLT to realize the connection between the PON and the IPRAN, and the SmallCell on site connects to the IPRAN network through the ONU;
AU: High-power SmallCell near-end, baseband processing function;
RRH: high-power SmallCell remote, radio frequency unit, transmit power 40 W/20 W/10 W/5 W;
Integrated iCell: Integrated SmallCell with baseband and RF functions, supports MIMO, and transmits power 2×125 mW.
Program features:
Use the PON available everywhere for access;
SmallCell has low cost and saves the construction cost of dedicated optical fiber;
Rapid deployment, open the site in half a day.
(2) PON-LAN access
Figure 2 shows the PON-LAN access network.
Networking instructions:
Gateway: Converge SmallCell signaling. One port of the gateway is connected to the core network through IPRAN, and one port is connected to SmallCell through the Internet. SmallCell can be accessed through PON without the need for an IPRAN private network;
Firewall: isolate the MAN from the core network;
Internet access: It can be accessed through the telecom PON/LAN network or PON/LAN network (as long as it can access the Internet). It is recommended that the access network bandwidth be greater than 50 Mb/s for downlink and 20 Mb/s for uplink.
