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C-RAN based wireless access system

A wireless access system and baseband processing technology, which is applied in the field of C-RAN-based wireless access technology, can solve problems such as not supporting large-scale CPRI circuit domain switching, and achieve real-time understanding of system working conditions and effective load length , the effect of reducing bandwidth requirements

Active Publication Date: 2016-09-21
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0004] Currently, the CPRI rate of TD-LTE 8-antenna 20MHz single-carrier RRU universal radio interface is 9.8304Gbps. High-bandwidth and high-real-time data transmission brings enormous pressure to the switching network. The existing switching network does not support large-scale CPRI. circuit domain switching

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  • C-RAN based wireless access system
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  • C-RAN based wireless access system

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Embodiment Construction

[0017] Such as figure 1 Shown is the C-RAN-based wireless access system of the invention, which includes a centralized baseband processing pool, transmission network, digital front end, and RRU. The transmission network is responsible for data interaction between the centralized baseband processing pool and the digital front end. The centralized baseband processing pool is responsible for the processing of the baseband link at the physical layer, and packs the effective data in the frequency domain after RE mapping and sends it to the digital front end through the transmission network; at the same time, the centralized baseband processing pool analyzes the status packets sent by the digital front end to understand The working status of other devices, and give corresponding control packets to the digital front end to realize real-time dynamic configuration. The digital front end implements as Figure 4 Part of the physical layer baseband link processing process shown, sends t...

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Abstract

The present invention provides a C-RAN based wireless access system including a centralized baseband processing cell, a transmission network, a radio remote unit (RRU), and a digital front end wherein the centralized baseband processing cell communicates with the digital front end via the transmission network. The digital front end also communicates with the RRU. The system utilizes the digital front end to process CPRI data and realizes partial physical layer processing function in the digital front end so that the processed CPRI data only needs to be interacted with the base band cell and only effective data on frequency domains are transmitted to the centralized base band processing cell, which reduces the transmission of redundant data, and greatly lowers the requirement of data transmission for the switching network bandwidth. This also means that the requirement for CPRI side bandwidth is lowered to be compatible with the access of more RRUs. The system of the invention reduces the bandwidth requirement in a data transmission process, realizes the real-time knowing of the system's working condition and real-time dynamic configuration, and realizes the maximization of the bandwidth utilization rate and the resource scheduling optimization.

Description

technical field [0001] The present invention relates to wireless communication technology, in particular to C-RAN-based wireless access technology. Background technique [0002] With the rapid development of the mobile Internet, the number of mobile users and business volume have increased rapidly, and the number of wireless communication base stations has increased dramatically. In the traditional cellular network, each base station processes terminal signals in the coverage area, and each base station needs its own cooling equipment, background transmission equipment, backup power supply, monitoring system, etc. Obviously, with the increase in the number of users and services of traditional base stations, the processing load surges, which significantly increases the energy consumption and operation and maintenance costs of the base station. The C-RAN technology optimizes the network architecture, adopts a heterogeneous approach, and introduces a hardware acceleration plat...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W28/16H04W88/08
CPCH04W28/16H04W88/085
Inventor 阎波王勇黎俣珩宫也江官露
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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