Book content structure
Chapter 1: Point-to-point wireless communication-from Bell to Morse
1.1, modern mobile communication system architecture
a. Analog communication system
b. Digital communication system
1.2. Signal transmission and signal analysis
1.3. Signal A/D conversion
Sampling (sampling theorem), quantization, coding
1.4, wireless
channel Several characteristics of wireless channel: channel bandwidth, channel capacity, delay extension, signal fading, multiple Puller Effect
Chapter 2: From Radio to Big Brother
2.1, Point-to-Point Wireless Communication
Telegram
2.2, Point-to-Multipoint Wireless Communication
Broadcasting
2.3, Point-to-Multipoint Wireless Communication
a. Analog Communication Network
b. Digital Communication Network
Chapter Chapter Three: GSM network designed by Xiaoben— Post Office in the cloud
3.1. Basic overview of GSM network
a. Mobile switching center—MSC
b. Base station controller—BSC
3.2. Work flow of GSM network
a. To communicate, Synchronize first
b. For access, apply first
c. If you want to talk, find someone first
d. Greeting first, then long talk
Chapter 4: WCDMA network designed by Xiaoben—Logistic company in the cloud
4.1 Basic overview of WCDMA
a .WCDMA network structure
b. Layered services
c. Code resource sharing
d. Fast scheduling
f. Adaptive coding
g. High-order modulation h.
ARQ
4.2. Some concepts of WCDMA a .
OVSF code
b. Scrambling code
Chapter 5: TD-SCDMA, Made in China
5.1, Development of
TD-SCDMA The development process of TD-SCDMA began in early 1998, under the direct leadership of the Department of Science and Technology of the Ministry of Posts and Telecommunications at that time, organized by the former Institute of Telecommunications Science and Technology On the basis of SCDMA technology, the team researched and drafted China's TD-SCDMA draft proposal that meets IMT-2000 requirements. The draft standard features smart antennas, synchronous code division multiple access, relay handover, and time division duplexing. The deadline for the ITU to solicit IMT-2000 third-generation mobile communication wireless transmission technology to answer the candidate’s proposal is June 1998. It was submitted to the ITU on the 30th and became one of the 15 candidates for IMT-2000. ITU has synthesized the evaluation results of each evaluation group. At the 18th meeting of ITU-RTG8/1 in Helsinki in November 1999 and the ITU-R plenary meeting in Istanbul in May 2000, TD-SCDMA was formally accepted as one of the CDMATDD schemes.
5.2 Main technologies of TD-SCDMA
(1) Time Division Duplexing;
(2) Joint Detection;
(3) Smart Antenna;
(4) Uplink Synchronous ;
(5)Soft Radio;
(6)Dynamic Channel Allocation;
(7)Power control;
(8)Baton Handover;
(9)High-speed downlink packet access Access technology (High Speed Downlink Packet Access)[5].
Chapter 6: CDMA2000, Qualcomm's last solo
6.1 Features of CDMA2000
1. Large system capacity: In theory, when using the same frequency resources, the CDMA mobile network has a capacity 20 times larger than an analog network, and in actual use it is 10 times larger than an analog network and larger than GSM 4- 5 times.
2. Flexible configuration of system capacity: In a CDMA system, an increase in the number of users is equivalent to an increase in background noise, resulting in a decrease in voice quality. But there is no limit to the number of users, and the operator can compromise between capacity and voice quality. In addition, multi-cells can be based on traffic volume
3. Simple frequency planning: users are distinguished by different sequence codes, so different CDMA carriers can be used in adjacent cells, and network loop planning is flexible and easy to expand.
4. Low cost of network construction. Answer: CDMA technology simplifies the planning of the entire system by using the same frequency in each part of each cell, and reduces the number of required sites without reducing the volume of traffic, thereby reducing deployment and Operating costs. The CDMA network has a large coverage area, high system capacity, and requires fewer base stations, which reduces network construction costs
6.2, CDMA 1X and GPRS
6.3, EV-DO and EV-DV
Chapter 7: LTE network-flatter and more efficient
7.1, The development and overview of
LTE LTE is a wireless data communication technology standard. The current goal of LTE is to use new technologies and modulation methods to improve the data transmission capacity and data transmission speed of wireless networks, such as the new digital signal processing (DSP) technology. The long-term goal of LTE is to simplify and redesign the network architecture to make it Become an IP-based network, which helps reduce potential undesirable factors in 3G conversion.
LTE technology mainly has two mainstream modes, TDD and FDD, and the two modes have their own characteristics. Among them, FDD-LTE is widely used internationally, while TD-LTE is relatively common in China
7.2, LTE's key technology OFDM
7.3, MIMO technology
7.4, LTE core ideas and physical layer structure and processes
Chapter 8: Towards 4G-LTE-Advanced 8.1, 4G
Vision
8.2, LTE-Advanced
LTE-Advanced (LTE-A) is an evolved version of LTE, its purpose is to meet the higher wireless communication market in the next few years Demands and more applications meet and exceed the requirements of IMT-Advanced, while maintaining better backward compatibility with LTE. LTE-A uses carrier aggregation (Carrier Aggregation), uplink/downlink multi-antenna enhancement (Enhanced UL/DL MIMO), coordinated multi-point transmission (Coordinated Multi-point Tx&Rx), relay (Relay), and heterogeneous network interference coordination enhancement (Enhanced Inter-cell Interference Coordination for Heterogeneous Network) and other key technologies, which can greatly improve the peak data rate, peak spectral efficiency, cell average spectral efficiency, and cell boundary user performance of the wireless communication system, and also improve the networking efficiency of
the entire network . Chapter Nine: Rule Makers in the Communication
Industry-
3GPP 9.1, Introduction to 3GPP 3GPP was established in December 1998, and a number of telecommunication standards organization partners signed the "3rd Generation Partnership Project Agreement." The initial scope of 3GPP's work is to formulate globally applicable technical specifications and technical reports for the third-generation mobile communication system. The third-generation mobile communication system is based on the developed GSM core network and the wireless access technologies they support, mainly UMTS. Subsequently, the scope of work of 3GPP has been improved, and the research and standard formulation of the UTRA long-term evolution system have been added. Currently, there are ETSI in Europe, ATIS in the United States, TTC and ARIB in Japan, TTA in South Korea, TSDSI in India, and CCSA in my country as the 7 Organization Partners (OP) of 3GPP. At present, there are more than 550 independent members. In addition, 3GPP has 13 market partners (MRP) including TD-SCDMA Industry Alliance (TDIA), TD-SCDMA Forum, and CDMA Development Group (CDG).
In the 3GPP organizational structure, the Project Coordination Group (PCG) is the highest management organization, and is responsible for overall coordination on behalf of the OP, such as being responsible for the 3GPP organizational structure, time plan, and work distribution. Technical work is done by the Technical Specification Group (TSG). At present, 3GPP is divided into 3 TSGs (previously 5 TSGs, after CN and T merged into CT, GERAN was revoked) respectively TSG RAN (radio access network), TSG SA (service and system), TSG CT (core Network and terminal). Each TSG is divided into multiple working groups (WG), each of which undertakes specific tasks. There are currently 16 WGs. For example, TSG RAN is divided into RAN WG1 (radio layer 1), RAN WG2 (radio layer 2 and layer 3), RAN WG3 (wireless network architecture and interface), RAN WG4 (radio frequency performance), RAN WG5 (terminal conformance test) and RAN WG6 (GERAN wireless protocol) 6 working groups.
9.2. Different versions of 3GPP protocol 1, 99
version
2, Release4
3, Release5
4, Release6
5.Release7
6.Release8:
7.Release9
Chapter 10 : First understanding of network planning and optimization