The dispute revolves around the use of what are known as standard-essential patents (SEPs) - patents that are deemed essential to the operation of standards such as mobile phone signal.
However, if the ratio continues to climb over time without explanation--and especially if the ratio is excessively high beyond either competitor or industry standards--it might be a signal to sell.
DVB-H, which has been adopted by the European Telecommunications Standards Institute (ETSI) as the standard for mobile TV services in Europe, works by beaming a signal to a digital TV receiver, attached to phones.