Networking scheme based on 3G wireless IP network

In an emergency situation, a mobile cluster base station can quickly expand communication coverage or increase network capacity at the location where an event occurs. Due to the high mobility and ease of deployment of wireless links, they have become the preferred choice for setting up mobile base stations. This paper analyzes and compares the advantages and disadvantages of using microwave, satellite, and 3G networks as networking solutions for clustered mobile base stations, based on the specific needs of different organizations. It concludes that the 3G wireless IP network offers significant benefits over other methods and provides a detailed explanation of its implementation. The paper also highlights real-world applications of this approach. I. Overview In recent years, TETRA systems, led by manufacturers like Motorola, have gained widespread recognition among public security agencies, transportation authorities, enterprises, and government users in China. Following successful support during the Beijing Olympics, the Armed Police Forces have accelerated their infrastructure development. Mobile cluster base stations help address signal blind spots or sudden events, enabling rapid response from the cluster network. They serve as a crucial supplement to fixed cluster network systems for public safety users. Typically, TETRA base stations use TDM (Time Division Multiplexing) links to connect to the network. However, telecom operators usually only provide TDM framing services within their backbone networks. As a result, mobile base stations often struggle to access existing TDM transmission networks through conventional connection methods. Therefore, achieving fast and stable networking for mobile base stations has become a critical challenge for cluster system developers. [Image: TETRA mobile base station development through 3G wireless IP network networking] 2. Introduction and Comparison of Current Networking Methods Currently, mobile cluster base stations often rely on microwave or satellite links for connectivity. However, these methods come with notable limitations (see Table 1 for details). From Table 1, it's clear that microwave and satellite equipment are large and cumbersome, making them difficult to transport and deploy on vehicles. In contrast, 3G networks offer better penetration, smaller and more cost-effective equipment, and long-term stability, making them a more practical solution. The downside is that 3G networks use TCP/IP protocols, while TETRA-based systems rely on TDM transmission. Therefore, protocol conversion is required for seamless integration. Three Networking Solutions Based on 3G Wireless Networks Personnel from the Communications Department of the Hainan Corps of the Armed Police proposed a TDM line solution based on a 3G wireless IP network. The basic principle involves using a protocol conversion device to convert IP packets into TDM frame structures used by private networks. By adjusting parameters of the mobile base station and 3G devices, the system can adapt to wireless transmission delays and enable the mobile cluster base station to connect with the fixed cluster network. Implementation conditions include 3G wireless network coverage and a dedicated VPN channel provided by the telecom operator between WCDMA wireless DTU and PCM aggregation devices. A single integrated communication vehicle equipped with a cluster base station, two RAD IPMUX units, and a 3G wireless internet access device (with a SIM card) is typically used. Equipment Connection Plan: Install Unicom WCDMA wireless DTU equipment on the integrated communication vehicle and use WCDMA VPDN technology to establish a dedicated VPN channel between the WCDMA wireless DTU and the PCM aggregation equipment. Between the mobile cluster base station and the wireless DTU equipment, WCDMA APN equipment and PCM multiplexing equipment are connected. A protocol conversion device is installed between the MUXs to allow the in-vehicle cluster base station to access the PCM device and finally connect to the Virtual Chassis Center (MSO). The device connection scheme is illustrated in Figure 1: [Image: TETRA mobile base station development through 3G wireless IP network networking]

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