Nokia (NYSE:NOK) and Siemens are pondering the future of their Nokia Siemens Networks joint venture, with Siemens angling for an exit this year. "I believe 2013 is the time for Siemens to help NSN to move into a better place," said Siemens CFO Joe Kaeser. However, in the meantime, NSN continues to roll along, business as usual. For example, NSN announced it won a contract to deploy an LTE network layer atop TIM Brasil's existing NSN-supplied 2G and 3G networks in the 2.6 GHz frequency band. Article