About mobile phone

The technical term of mobile phone refers to changing or replacing some original languages, pictures, ringtones, software or operating systems of mobile phones through certain methods. Generally speaking, brushing the machine is to reinstall the system for the mobile phone. Brush machine can make the function of mobile phone more perfect and restore the mobile phone to its original state. Under normal circumstances, the Android mobile phone system is damaged, resulting in functional failure or failure to boot, which is generally restored by brushing. Brush machine can be official or unofficial.

(2) Prison break

"Jailbreak" refers to bypassing Apple's many restrictions on the operating system on the device, so that you can "Root" the basic operating system. Simply put, "jailbreak" allows iPhone users to download other unofficial applications from outside the Apple App Store or customize the user interface. Literally, it's like a prisoner who escaped from a deep prison and gained his freedom; And there are no constraints.

(3) read-only memory

ROM in smart phone configuration refers to EEProm (Electrically Erasable Read Only Memory), which is similar to the hard disk of a computer. How many things a mobile phone can store depends on its capacity. The basic package+update package is collectively referred to as ROM package. Generally divided into two categories. One is the original ROM from the official mobile phone manufacturer, which is characterized by stability and different customization functions with the manufacturer; The other is to develop a native ROM written by enthusiasts by using the officially released source code, which is characterized by adjusting according to the specific needs of users, so as to make the ROM more in line with the usage habits of users in different regions.

For example, Android rom is an open source operating system based on Linux, which is mainly used for portable devices. The Android operating system was originally developed by Andy Rubin, and initially mainly supported mobile phones. In 2005, it was acquired and funded by Google, and open handset alliance was established to develop and improve it, and gradually extended to tablet computers and other fields. The main competitors of Android are Apple's iOS and RIM's BlackBerry OS.

(4) pixels

"Pixel" consists of the letters of two words: image (foreign language: Picture) and Element (foreign language: element), and is the unit used to calculate digital images. Like photographs, digital images have continuous shadows. If you enlarge the image several times, you will find that these continuous tones are actually composed of many small squares with similar colors, which are the smallest unit "pixels" that make up the image. This smallest graphic unit can usually display a coloring point on the screen. The higher the pixel, the richer the sample and the more realistic the color is.

(5) Flash memory

Flash memory is a long-life nonvolatile memory (it can retain the stored data information even if power is cut off), and data deletion is not in single byte units but in fixed blocks (Note: NOR Flash is stored in byte units. ), the block size is generally 256KB to 20MB. Flash memory is a variant of EEPROM. The difference between flash memory and EEPROM is that EEPROM can be erased and rewritten at byte level, not the whole chip, and most chips of flash memory need block erasure. Because data can still be saved when power is off, flash memory is usually used to save setting information, such as data in computer BIOS (basic input and output program), PDA (personal digital assistant) and digital camera.

(6) Central processing unit

The CPU of mobile phone is one of the functions of mobile phone that shoppers ignore in daily life. In fact, the most important thing for a smart phone with excellent performance is its "core", which is the CPU. Like the computer CPU, it is the control center system of the whole mobile phone and the control center of the logic part. Microprocessor achieves control by running the software in the memory and calling the database in the memory.

1, Texas Instruments

Advantages: low frequency, high energy and low power consumption, and high-end smart phones must have CPU.

Disadvantages: the price is high, and the corresponding mobile phone price is also high. The performance of OMAP3 series GPU is not high, but OMAP4 series has improved obviously, and its data processing ability is weak.

2. Intel

Advantages: CPU has high main frequency and high speed.

Disadvantages: high power consumption and low unit frequency performance.

3. Qualcomm

Advantages: high frequency, excellent data processing performance, the most extensive product roadmap, and support for various terminals including smart phones, tablet computers, smart TVs, etc. , supporting all major mobile operating systems and 3G/4G network standards.

Disadvantages: weak graphics processing ability and high functional consumption.

4. Samsung Electronics

Advantages: Low power consumption, Samsung Hummingbird S5PC 1 10 single core is the strongest, DSP is well matched, and GPU performance is strong.

Disadvantages: Samsung Orion dual-core fever problem, equipped with MALI400GPU component is single, compatibility is not strong.

5. Marville

Advantages: It inherits and develops the performance of PXA.

Disadvantages: high power consumption

6. NVIDIA

Advantages: The earliest dual-core CPU, equipped with Geforce ULP, has small area, strong performance and low power consumption.

Disadvantages: Tegra2 removes NEON because of power consumption, which leads to big video decoding problems and less support for hardware decoding formats.

7. Huawei

Advantages: 20 12 industry's smallest quad-core A9 architecture processor. It is a high-performance CPU designed by Huawei.

Disadvantages: poor compatibility

(7) Snapdragon

Snapdragon is a highly integrated "integrated" mobile processor series platform launched by Qualcomm, covering entry-level smartphones and even high-end smartphones, tablets and next-generation smart terminals. Based on the microprocessor core customized by ARM architecture, Snapdragon combines the industry-leading 3G/4G mobile broadband technology with powerful multimedia function, 3D graphics function and GPS engine. 20 12 On February 20th, Qualcomm officially named the Chinese name of Snapdragon series processors as "Snapdragon".

As a new technology, CDMA CDMA2000 is rapidly sweeping the world and has occupied 20% of the wireless market. By the end of 20 12, the number of CDMA2000 users worldwide had exceeded 256 million, and 156 operators in 70 countries had commercialized 3G CDMA services. Dozens of OEMs around the world, including Ankexin Communication Technology Co., Ltd. authorized by Qualcomm, have launched EVDO mobile intelligent terminals. In 2002, Qualcomm's chip sales reached a record high. Since 1994, Qualcomm has provided more than 7.5 billion chips to many manufacturers around the world, including China.

(8) MediaTek

Lianfa Technology is a famous IC designer in Taiwan Province Province, China, focusing on wireless communication and digital multimedia. Its chip integrated system solutions include wireless communication, high-definition digital TV, optical storage, DVD and Blu-ray and other related products. Lianfa Technology was established in 1997 and has been publicly listed on Taiwan Stock Exchange. Headquartered in Taiwan Province Province, China, it has sales or R&D teams in Chinese mainland, India, the United States, Japan, South Korea, Singapore, Denmark, Britain, Sweden and Dubai.

(9)WCDMA

WCDMA mainly originated from the early third-generation wireless research activities in Europe and Japan, and the great success of GSM had a great impact on the standardization of the third-generation system in Europe. In Europe, the RACE (European Advanced Communication Technology Research) program started from 1988 and lasted until1June 992, representing the beginning of the third generation wireless research activities. The RACEⅱII ii program started in Europe 1992- 1995. ACTS (Advanced Communication Technology and Service) was established at the end of 1995, and proposed FRAMES (Future Wireless Broadband Multiple Access System) scheme for UMTS (universal mobile telecommunications system). In these early studies, various access technologies, including TDMA, CDMA and OFDM, were tested and evaluated. It laid a technical foundation for WCDMA.

As a new technology, WCDMA is also derived from the practice and application of CDMA technology. WCDMA is rapidly sweeping the world and has occupied 80% of the wireless market. By the end of 20 13, the number of WCDMA users in the world has exceeded 3.6 billion, and 156 operators in 70 countries have commercialized 3G WCDMA services. Dozens of OEMs around the world, including Ankexin Communication Technology Co., Ltd. authorized by Qualcomm, have launched WCDMA mobile intelligent terminals. In 2002, Qualcomm's chip sales reached a record high. Since 1994, Qualcomm has provided more than 175 billion chips to many manufacturers around the world, including China. That's what I learned! )

( 10)TD

TD-SCDMA, as the third generation mobile communication standard (3G for short) proposed by China, was formally submitted to ITU (International Telecommunication Union) from 1998. It has been more than ten years since it completed a series of international standardization work such as expert group evaluation, ITU approval and publication, integration with 3GPP (3rd generation partnership project) system and introduction of new technical features, thus making TD-SCDMA the first standard. This is an important milestone in the telecom history of China. (Note: 3G*** has three international standards, and the other two are CDMA2000 led by the United States and WCDMA led by Europe. )

Within the TD-SCDMA industrial alliance, a unified intellectual property management policy is implemented, and technical information and market information are highly shared. Promote the rapid and healthy development of TD-SCDMA industry through close communication and reasonable division of labor.

Alliance members:

Institute of Telecommunications Science and Technology (Datang Telecom Science and Technology Industry Group)

Huali group co., ltd

Huawei technologies co., ltd.

Lenovo (Beijing) Limited

Shenzhen zhongxing communication co., ltd

China Electronic Information Industry Group Corporation

China Putian information industry group company

Beijing Tianqi technology co., ltd

Chongqing changyuan xinke co., ltd.

Hisense Group Limited

Ming Kai Information Technology Co., Ltd.

Xi an Haitian antenna technology co., ltd

Zhanxun Communication (Shanghai) Co., Ltd.

Beijing zhong Chuang Xin ce technology co., ltd

Hubei Zhong You Science and Technology Industry Co., Ltd.

Alcatel Shanghai bell co., ltd

Shanghai dibite industry co., ltd

UT starcom company

Yinghuada (Shanghai) Electronics Co., Ltd.

Zhongshan tongyu communication equipment co., ltd

Qingdao Haier communication co., ltd

Shanghai ketai century technology co., ltd

Wuhan post and telecommunications science study institute

TCL group

Guangzhou xinyou communication equipment co., ltd

Andrew Telecom Equipment (China) Co., Ltd.

Ding Xin Communication (Shanghai) Co., Ltd.

Beijing Xinghe Liangdian Communication Software Co., Ltd.

Jingxin Communication Technology (Guangzhou) Co., Ltd.

China Electronics Technology Group Corporation No.14 Institute

Mobi Antenna Technology (Shenzhen) Co., Ltd.

Ruidike Micro-electrons (Shanghai) Co., Ltd.

Beijing Han Ming Xin tong technology co., ltd

Ningbo Bird Company Limited

China electronics technology group company no.41 institute

Yiyang xintong co., ltd

Shenzhen changfang network technology co., ltd

Yulong Computer Communication Technology (Shenzhen) Co., Ltd.

Simitong Information Technology (Shanghai) Co., Ltd.

Qi Long Holdings Limited.

Advantages and disadvantages of TD in China and its switching technology in the United States and Europe

superiority

1. High spectrum utilization, TD, carrier frequency 1.6M W, carrier frequency 10 M.

2. The requirements for power control are low, TD 0 ~ 200mz, w 1500 MHz (note: but the power control rate is very slow).

3. Both smart antenna and joint detection have introduced the so-called antenna classification, but the effect needs to be verified (note: smart antenna cannot be used at present).

4. It avoids the slight influence of different services on the coverage area in respiratory effects TD, and is easy for network planning.

Disadvantages:

1.TD[ 1] needs GPS synchronization, and the accuracy of synchronization affects whether the whole system works normally.

2. The limited code resource TD is only 16 code, which is far less than the number of codes required by business requirements.

3. Interference: uplink and downlink, there may be interference between this cell and neighboring cells.

4. the moving speed is slow TD120km/hw500km/h.

5. The measured drop rate of relay handover is equivalent to that of hard handover.