Nokia Networks is buying part of Panasonic System Networks Co. Ltd.'s wireless networks business.

The deal includes Panasonic's mobile phone wireless base station system business for mobile operators, and the related wireless equipment system business.  The deal is expected to close in January. Terms were not disclosed.

Espoo, Finland-based Nokia says the deal helps it expand in Japan. The acquisition also allows the company to improve efficiency and quality control for product development and research and development. Earlier in July, the company agreed to buy infrastructure and network group SAC Wireless. In 2013, the company agreed to sell its handset business to Microsoft Corp. (Nasdaq: MSFT) for $7.2 billion.

Panasonic, headquartered in Kadoma, Japan, develops and engineers electronic technologies for residential, non-residential, mobility and personal applications.