Shulou(Shulou.com)11/24 Report--

Recently, China Mobile issued a special procurement announcement, which attracted the attention of the industry.

According to the announcement, what they want to purchase is a kind of equipment called "portable integrated satellite base station". The total budget of the project purchase is 48 million yuan (excluding tax), and a total of 200 sets are needed. In translation, the maximum bid price for a single set of equipment is 240000 yuan (excluding tax).

Satellite communications have been very popular in the past two years. Many people ask: what on earth is a portable all-in-one satellite base station? What's the difference between it and an ordinary base station?

In today's article, Xiao Zao Jun will come to answer for you.

█ what is a satellite base station "portable all-in-one satellite base station", in essence is a base station.

However, there is an important difference between it and the traditional base station-its return mode (the data connection between the base station and the core network computer room) is not the traditional optical fiber cable or network cable or microwave, but the satellite.

Satellite base station is a combination of two communication systems.

Facing the network side, it communicates with a satellite (the satellite is a relay). Facing the user side, it communicates with many ordinary mobile phones and serves the public users.

Application scenario of █ Satellite Base Station the advantages of satellite base station are obvious.

It gets rid of the shackles of space, reduces the dependence on the ground transmission network, and is suitable for scenarios where optical fiber and cable can not be reached, as well as geological disasters and ground transmission network damage.

In particular, the purchase of the "portable all-in-one satellite base station", small size, light weight (about 10kg), suitable for a single person to carry, can also be carried by car, it is very convenient to deploy.

Recently, domestic geological disasters are frequent. Floods, landslides, landslides and so on, may lead to damage to traditional base stations.

At this time, as an important means of emergency communication, satellite base stations can play an important role. The relevant departments can carry out emergency rescue and disaster relief command and work coordination through it, and ordinary people can also call for help and report peace through it.

Compared with the traditional satellite portable station, the satellite base station can serve more users, and the ordinary mobile phone can be connected directly.

In addition to emergency communications, in recent years, domestic operators have also used satellite base stations in ocean-going fishing, resource exploration, outdoor operations and other special work scenarios.

In February this year, China Mobile launched Jiangsu's first satellite 5G portable base station in Nantong, Jiangsu Province.

The base station is installed on the fishery administration ship, which provides communication guarantee for fishery safety production and marine life rescue, and promotes the development of marine economy.

Technical analysis of █ satellite base stations next, we might as well take an in-depth study of the technical requirements of the satellite base stations purchased by China Mobile this time.

First of all, the first question: which satellite are these integrated satellite base stations connected to? What working frequency band is used?

According to the tender, the bid products "must accept the unified management and deployment of equipment and network of China Mobile Asia-Pacific 6D high-throughput satellite gateway station, which can support bandwidth sharing and dynamic adjustment"; "must provide the antenna network approval certificate or instructions for allowing access to the network confirmed by the Asia-Pacific 6D high-throughput satellite operator-Asia-Pacific Satellite Broadband Communications (Shenzhen) Co., Ltd.".

This means that the Asia-Pacific 6D satellite is used.

Asia-Pacific 6D, launched in 2020, is the first Ku-band global high-throughput (High Throughout Satellite, HTS) broadband commercial satellite developed in China.

Some people may ask, why is there no connection to Zhongxing 26?

The "Zhongxing 26" high-throughput satellite was launched only this year, and it seems that it is not yet available for commercial use.

In terms of working frequency, according to the description of the tender, it is--

Uplink: 14000 MHz ~ 14500MHz

Downlink: 10700 MHz~ 11700MHz 12750 MHz, all need to be supported

Second question: what is the connection rate between the satellite base station and the satellite?

In terms of satellite connection rate, the tender requires that under sunny conditions, the satellite transmission rate between single station and gateway station is not less than uplink 8Mbps and downlink 24Mbps.

The case of offshore satellite base station in Nantong, Jiangsu Province was mentioned earlier. According to relevant reports, the satellite base station is also connected to Asia-Pacific 6D, which can reach the upload rate of 15Mbps and the download rate of 72Mbps.

The tender also requires that the portable satellite antennas in the bidding products should support the automatic satellite alignment function based on the OPENAMIP protocol (the antenna control system independently controls the antenna motor and automatically aligns the satellite). After arriving at the emergency site, the satellite antenna can automatically align the satellite with one button without human intervention.

Let's take a look at the base station transceiver capacity of satellite base stations. The third question: which mobile communication frequency bands can the purchased satellite base stations support and how many users can they bring?

For the bidding products, the tender clearly requires that the integrated structural design should be adopted, including satellite antenna, Femto base station, wireless WIFI, high-throughput modem, BUC (up-conversion power amplifier), LNB (low-noise downconverter), battery, and the base station service and Wi-Fi Internet service can be realized through high-throughput satellite.

This satellite base station must not be compared with the traditional iron tower base station. It belongs to Femto base station, that is, "flying base station" and picocell base station.

It is similar to the appearance of a small router, and the transmission power of a single base station is at the 250mW level.

In terms of working frequency band, only FDD-LTE:Band3 band is required (downlink: 1805~1880MHz, uplink: 1710~1785MHz dual antenna).

It can be seen that this is not a 5G base station, but a 4G base station, the bandwidth requirement is not high.

According to the requirements of the tender, the bidding product must support 3GPP R9, at least 32 business concurrent users and 96 RRC connected users.

█ concluded that there is no doubt that these portable all-in-one satellite base stations are purchased for emergency communications.

In the event of a disaster, these satellite base stations can help quickly restore the network connection on the site and improve the efficiency of disaster relief. A total of 200 sets are purchased, which is not much, and should be able to meet the normal emergency communication security needs.

The commercial value of satellite communications is constantly emerging. In the future, our country will have further measures in this field, including the launch of high-throughput satellites with higher bandwidth, and the establishment of low-orbit star chains (China just successfully launched a satellite Internet technology test satellite on the 9th of this month).

As an important part of the strategic layout of air-space integration, the development of satellite communications is expected!

This article comes from the official account of Wechat: fresh Jujube classroom (ID:xzclasscom), author: Xiaozaojun

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