Referring URL(r) is missing from image beacon when moving from subdomain

I am trying to know how many people coming from xyz.apples.com to abc.apples.com. Here apple.com is common. On xyz.apples.com there is no adobe analytics implemented, but on abc.apples.com Adobe Analytics is implemented. So when I click on Tile on xyz.apples.com which leads to land on abc.apples.com that time on image beacon "r"(referrer) parameter is not present. Any solution here.