The concept of AP and BP in mobile phone development

Transferred from: http://blog.csdn.net/macong01/article/details/15504611

AP and BP for mobile phones:

Ap:applicationprocessor, the application chip

Bp:basebandprocessor, i.e. baseband chip

The APS run our usual operating systems and applications, such as Android, Windows phone 7. What we usually call a dual-core, quad-core is the number of its AP cores. So you can understand that the AP can be counted as your computer, BP is a computer modem, no modem, you have no way to communicate with the outside world.

The main role of BP is to send and receive a variety of data, that is, the communication is closely related to the BP DSP implementation of the Protocol algorithm, the data encoding and decoding, the CPU in BP is responsible for coordinating control and base station and AP communication. The power management module in BP has a great impact on the phone's standby time, because most of the time the CPU of BP should be idle, and every time it is opened to see if there is a call entry on the Pagingchannel. In addition, the SIM module is also directly linked to the BP, the operation of the SIM card is also through the BP.

1) Most phones contain two processors. Operating systems, user interfaces, and applications are performed on the application Processor (AP), with the AP generally using the arm chip's CPU. and the handset radio frequency communication control software, then runs on another separate CPU, this CPU is called baseband Processor (BP). The main reason for the RF function on BP is that the RF control functions (signal modulation, coding, RF displacement, etc.) are highly time-dependent. The best way to do this is to put these functions on a main CPU and the main CPU is running the real-time operating system. Because the AP and BP are separate devices, the handset designer can design the user interface and application software more freely.

2) Mobile phone developers, such as Motorola, will develop the mobile phone package into the AP and BP two parts, running on the application Processor (AP) package called AP package, including operating system, user interface and applications; The packages associated with Basebandprocessor (BP) are called BP packages, including the communication control software of the baseband modem. Accordingly, the so-called refresh of the mobile AP and the BP file.

Note: The rom we normally brush is the AP-tested software.

The concept of AP and BP in mobile phone development