Qualcomm and Nokia first signed the current licensing agreement back in the early 90s, and re-vamped it in 2001. The agreement allows each company to use portions of the other's existing technology in their own products for certain licensing fees. For example, Nokia pays Qualcomm between 4% and 5% of the cost of each handset it sells that uses CDMA technology. Cross-licensing agreements like this are nothing new. Companies do it all the time. Why is the fuss surrounding this one creating so many waves? Well, billions of dollars.
Analysts estimate that Nokia already pays Qualcomm $500 million per year to license its patents. I can't think of anyone who wouldn't want to keep getting half-billion dollar checks in the mail. On the flip side, I can't imagine Nokia enjoys writing out those checks, either.
Whatever the details are of any future agreements, you can be sure that we'll all feel the reverberations. How soon that will be, however, depends on how reasonable both companies are during the negotiation process.
Considering the legal maneuvering we've already seen, and the threat of new legal action after the agreement ends from both firms, I am not overly hopeful for a speedy resolution.