1. What is AISG ？

AISG protocol, the full name of Antenna Interface Standards Group (Electrically Adjustable Antenna Equipment Standards Organization), official website www.aisg.org.uk.

Due to the lack of compatibility between products of different manufacturers of ESC antenna systems, they cannot achieve interoperability. For example, the ESC antenna equipment produced by one manufacturer cannot be fully connected with the base station system provided by another supplier, so that mobile operators cannot integrate different manufacturers. The product builds an overall RET (Electrically Regulated Antenna) system to achieve the highest cost performance, but also brings uncertainty to the investment of antenna product suppliers and base station system suppliers. Based on the above reasons, the world's mainstream antenna product manufacturers and base station system suppliers (such as Kathleen, Huawei, Andrews, etc.) established the Electrically Adjustable Antenna Equipment Standards Organization (Antenna Interface Standards Group, AISG) in November 2001. , and released version 1.0 of the AISG protocol. Although this version has many problems and has not been widely used, it has played an epoch-making role in the internationalization of ESC antenna equipment standards.

In June 2004, the AISGV1.1 standard protocol was released. The purpose of this protocol is to realize the compatibility and interoperability of ESC antenna equipment and control system, but since this protocol version does not strictly follow the standard of 3GPP [7-10], it will have a certain impact on subsequent use.

In June 2006, AISG released the AISG V2.0 standard protocol. The purpose of this release is to ensure basic interoperability of the antenna and control infrastructure and is based entirely on 3GPP specifications. This version is well compatible with products that conform to 3GPP specifications, but is not backward compatible with AISGV1.1.

The latest standard AISG-APCCv3.0 was released in May 2015. The purpose of this standard is to introduce a color and print mode coding scheme as well as a textual AISG control marking scheme for the antenna RF port. The use of designated color or pattern coding and text marking can be used to assist installers or assemblers in reducing wiring errors to identify antenna arrays and associated control ports. This standard is mandatory within the entire system and the entire specification. But specifically in one installation, it is optional for adaptability.

In addition, in order to meet more requirements, several extension standards were released in January 2013, these extension standards include AISG ES-RAS V2.1.0, AISG ES-RAB V2.1.0, AISG ES-ASD v2.1.0 , AISGES-ACS v2.1.0, AISG ES-GLSv2.1.0, AISG ES-CPMv2.1.0, AISG ES_ATS v2.1.0, AISG-APCC v3.0. At present, the AISG organization is working on the development of other extended standards to better solve the interoperability between ESC antenna equipment and control equipment and software of different manufacturers, and to realize remote monitoring of ESC antenna equipment (mainly down-tilt angle, etc.). monitoring) and other extensions. As of December 23, 2015, AISG has more than 50 members. These include communication operators, ESC antenna system manufacturers, and antenna product suppliers.

At present, in the field of ESC antenna control, the widely used AISG protocol mainly has two versions, namely AISG V1.1 version and AISG V2.0 version, this paper takes version 2.0 as an example.

2. AISG2.0 protocol

The formulated AISG2.0 protocol is a supplement to 3GP-related protocols, making it suitable for remote electrical tilt (RET) systems and tower-mounted amplifiers (TMAs) devices. To accommodate and add new ESC antenna devices (such as VSWR measurement units), new specifications will continue to be released.

According to the requirements of the AISG protocol, the AISG protocol stack can be divided into three layers, the first layer is called the physical layer, the second layer is called the data link layer and the third layer is called the application layer.

The specific functions of each layer are as follows:

Layer 1 is the physical layer and defines signaling levels, basic data characteristics including bit rate and preferred input connectors.

Layer 2 is the data link layer, which is a custom subset based on the HDLC standard.

Layer 7 is the application layer, which defines the payload format of the data and the required set of commands

The application layer and the data link layer communicate through the information field of the HDLC frame, while the data link layer and the physical layer communicate through the HDLC frame.

It can be seen that the AISG protocol, in terms of the communication method of the upper and lower computers, firstly solves the problem of the HDLC protocol.

 
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