With the introduction of HSPA feature phones and the improvement of the quality of video and data content, the communication architecture between many processors is becoming more and more perfect. The traditional interconnection architecture has been unable to support the data throughput matching the baseband processor functions and future mobile communication standards. This article will discuss why multi-port interconnection can be a viable solution.
In the process of globalization, global business or leisure travel has become more and more popular. It is best to carry the most basic and compact items on the road. Mobile phones are currently the preferred device, which makes gadgets such as MP3 players, portable navigation devices, cameras and handheld video game consoles redundant. With more than one billion mobile phones shipped each year, mobile phones have now become one of the basic necessities for people to travel. However, it will not be of much use if it does not work properly in the destination country.
For example, South Korea and Japan support CDMA and FOMA standards, while most European countries only support GSM, and these standards are not compatible with each other. Many other countries support both GSM and CDMA standards, depending on the specific operator registered by the user. Therefore, single-mode mobile phones cannot be used globally. Many travelers have to bring two mobile phones, or buy a new SIM card on the go, and then tell friends and colleagues about the new number via email.
The incompatibility of mobile phone standards has stimulated the demand for dual baseband dual mode (DBDM) mobile phones. DBDM mobile phones can provide true global operability because mobile phone manufacturers are scrambling to provide global roaming capabilities to their users. The DBDM mobile phone is a single mobile phone equipped with two independent baseband processors. These mobile phones usually contain two slots into which a SIM card for GSM channels and a RUIM module for CDMA channels can be inserted. However, those mobile phones that already have on-board CDMA functionality only need to provide a slot for the SIM card. At present, major mobile phone manufacturers claiming to launch "global mobile phones" include RIM, Samsung, LG, Motorola, etc.
In addition to processing the corresponding CDMA or GSM signals, each baseband processor also needs to perform some special tasks, ranging from simple applications such as keyboard operations and LEDs to complex functions such as operating LCD screens, cameras, and video processing. Since the two independent processors receiving the signal and the various other applications between them are separated, the data transmitted between the processors must be efficient to prevent delays in the user terminal and ensure its battery life Less affected. Due to the introduction of high-resolution camera functions and video streaming services in mobile phones, larger files and higher data rates will further promote the need for efficient data processing between processors. Have we seen very few things that the phone process is suspended when accessing stored photos or videos?
With the rapid development of telecommunications technology, the kbps-level wireless data transmission rate in 2.5G / 2.75G mobile phones is gone, and today 3.5G mobile phones with HSPA functions are required to support Mbps-level data transmission. Future mobile communication standards currently being tested (such as WiMax, WiBro, LTE and UMB) will further increase the data transmission rate. To match the increasing speeds in these new standards, processors must increase processing power, and cellular networks must be upgraded to meet exponentially increasing data transmission rate requirements.
However, with the improvement of the processing function of the baseband processor and the enhancement of the data function of the cellular network, the old communication architecture between the processors limits the optimization of the performance of the mobile phone. This part of the telecommunications ecosystem has lagged far behind the exponential growth of the cellular handset industry. Today's baseband and application processors can reach hundreds of megabits of MIPS, and the data rate of HSPA-enabled mobile phones can reach above 10Mbps. However, due to all the emphasis on processor functions and wireless data rates, communication between processors has become a major bottleneck. Many mobile phone designers are aware of this problem. Although they have the latest and best processors and chipsets, they seem to be unable to improve the performance of the device.
Figure 1: Current solutions and their shortcomings.
Figure 2: Alternative solution for communication between mobile phone processors
Figure 3: Comparison of communication solutions between mobile phone processors
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