A New Method for Supporting Multiple AISG2.0 Interfaces in Wireless Communication Base Stations

This paper proposes a design method to support multiple AISG2.0 connections on the base station. 

With the cooperation of hardware and software design, not only can a single AISG protocol stack manage multiple AISG interfaces, but also conflicts between multiple interfaces can be avoided. .

This paper also lists the multi-AISG interface configurations that have been verified as feasible.

AISG protocol stack RET TMA

With the wide application of the AISG protocol, especially its 2.0 version, there are more and more antenna-related devices (ALDs) on the operator's base station site, and the connection methods are complex and diverse.

It can be connected through AISG port, or through the DC and 0OK signals through the RF cable to connect to TMA and then serially connect to RET, or through T-head to convert between 0OK and RS485

This poses a new design challenge to the AISG function of the base station. It is required that the base station can support both the RS485+DC mode of the AISG port and the OOK+DC mode of the two antenna ports. It is required that the two antenna ports and the AISG port can work at the same time. .

Hardware Design of Multiple AISG Interfaces

In the existing design that can only support one AISG interface, the DC sum signal of the antenna port 1, 2 or the AISG port is switched internally in the base station. When the AISG device is powered on and scanned, if there is an ALD device on the antenna port or AISG port, the corresponding port will be opened, but it cannot support both ports being connected to the device.

To upgrade from a single AISG interface to supporting 3 AISG interfaces, the easiest and most direct way is to copy the AISG management channel into 3 sets, but doing so will require 3 independent AISG protocol stacks, and between 3 protocol stacks with the same function The management and scheduling of AISG is very cumbersome and consumes CPU resources. If two AISG interfaces are connected to the same ALD device (for example, the ALD device is placed on two towers), it is difficult to compare and judge between different AISG protocol stacks.

The new design proposed in this paper can satisfactorily solve this problem.

Assume that 0OK1, OOK2 and RS485 communicate independently with the connected ALD devices on the antenna ports 1, 2 and AISG ports respectively, and use the FPGA to put the interactive information of the three interfaces into the registers, and the AISG protocol stack in the CPU accesses the FPGA in turn For the AISG protocol stack, this design simulates the devices on multiple interfaces as multiple devices on one interface_.

The usage of the AISG protocol stack is no different from that of a single AISG interface, and AISG devices on different interfaces can interact with the protocol stack.

A single AISG protocol stack supports software design of multiple interfaces

AISG software management can be divided into 3 levels, ALD manager, AISG protocol stack and AISG driver.

The ALD manager is responsible for initializing the AISG protocol stack and interacting with the application layer software. 

The AISG protocol stack is the main controller of the AISG protocol, and the AISG driver is responsible for data communication with the three AISG interfaces.

Premier Cable is a factory based in Dong Guan City to make cable for base station antennas

We make AISG RET cables, and AISG to DB9 cables, AISG interface Cable, AISG2.0 base station connection cable 

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