| 摘要 |
Systems and methods for multiple network access by mobile computing devices are disclosed. In one embodiment, a data bus (60) is used to couple multiple baseband processor endpoints (66, 68) to multiple network access cards (62), such that each baseband processor endpoint may communicate over the data bus to any of the network access cards. Modems (66) and application processor (68) operate as a baseband processor endpoint. EIn an exemplary, non-limiting embodiment, the baseband processor endpoint comprises a modem (66) and the network access cards are subscriber interface module (SIM) cards or universal integrated circuit cards (UICCs). In an exemplary embodiment, bus interfaces (64) may append an address to data placed on the data bus (60) and may place data on the data bus (60) according to a time division multiplex (TDM) protocol. By allowing each of the baseband processor endpoints to use any of the network access cards, different networks may be used for different purposes by the mobile computing device. Further, the use of a single bus in this manner may allow for greater scalability, while also saving pin count, silicon area, board area, and power consumption within the computing device. Such savings ultimately improve the cost of the device. |
