In addition to being a viable outlet for Huawei, this investment in UNISOC could put the company on the map of major manufacturers. The idea is the same that the Chinese has used with SMIC:
In the past, it was very difficult for UNISOC to obtain a contract with a major global smartphone manufacturer. This time, Huawei's opportunity could integrate the Shanghai company to international standards.
For now, UNISOC is unable to deliver advanced processors to Huawei. Therefore, the manufacturer has already extended its orders for MediaTek. The intention is to use Taiwanese chipsets in intermediate and high-end smartphones with 5G.
However, MediaTek is still analyzing the situation, as Huawei's orders have grown 300% and there is not enough workforce to supply so many chips in a short time.