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4G/5G Small Cell Solutions

2025-02-21

Overview

Using open-source system platforms and hardware to study small-scale base stations is an important direction of research in the fields of radio and LTE wireless communications. Traditional commercial base station equipment is expensive, has long development cycles, high operational complexity, and cumbersome functionality changes. To address the issue of complex functionality changes and long development cycles in the study of LTE wireless communication base stations, the proposed solution adopts the open-source OAI 5G and srsRAN software systems and a software-defined radio (SDR) hardware platform to build real-time operating base stations for research on interactions with terminals. This approach avoids the issues of bulky and expensive base stations with long development cycles, improving the efficiency of research on base stations and terminal interactions.

Solution

Based on the USRP-LW/SDR-LW series of software-defined radio hardware, combined with software platforms such as srsRAN and OpenAirInterface (OAI) 5G, a 4G/5G simulation base station and terminal can be built. By using different models of software-defined radio hardware and various base station configuration parameters, different functionalities can be achieved. This system can fully simulate the end-to-end protocol stack, accurately model the base station, terminal, and core network, while complying with the corresponding 3GPP protocol specifications. It supports integration with commercial equipment (such as commercial terminals and core networks) and allows secondary development based on the protocol stack.

Figure 1 shows the LTE system architecture, consisting of three parts: the core network (EPC), the base station (eNB), and the user (UE). Each part implements its corresponding functions according to the 3GPP LTE protocol stack. On the UE side, the architecture includes functions such as PHY, MAC, RLC, PDCP, and RRC. The UE communicates with the eNB for uplink and downlink data exchange via the air interface. In the middle is the eNB architecture, which includes the air interface with the UE and the S1-U and S1-MME interfaces with the core network. On the right side is the EPC, which consists mainly of network elements such as the MME, S-GW, and P-GW.

Figure 2 shows the NR system architecture. The 5G radio interface inherits the 4G protocol stack, with an additional SDAP layer introduced in the user plane to mark Quality of Service (QoS). The 5G system architecture is also divided into three parts: the user (UE), the 5G base station (gNodeB), and the core network (5GC). The ng-eNB, gNodeB, and 5GC are connected through the NG interface.

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USRP SDR

USB SDR Transceiver

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Anti UAV System

Clock Source Device

Embedded SDR

RF Daughter Card

Millimeter Wave System

Antennas Cables And Accessories

5G Base Station

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USRP SDR

USB SDR Transceiver

USRP X Series

Anti UAV System

Clock Source Device

Embedded SDR

RF Daughter Card

Millimeter Wave System

Antennas Cables And Accessories

5G Base Station

Wireless Video Transmission System

RF Data Acquisition System

Solutions Details

4G/5G Small Cell Solutions

4G/5G Small Cell Solutions

Overview

Solution

4G/5G Small Cell Solutions

4G/5G Small Cell Solutions

Overview

Solution