CN209787475U

CN209787475U - DAS system capable of flexibly expanding user capacity

Info

Publication number: CN209787475U
Application number: CN201822207139.XU
Authority: CN
Inventors: 徐锡强; 洪杭迪; 王剑侠; 陈高强; 吴涛
Original assignee: Sunwave Communications Co Ltd
Current assignee: Sunwave Communications Co Ltd
Priority date: 2018-12-26
Filing date: 2018-12-26
Publication date: 2019-12-13
Anticipated expiration: 2028-12-26

Abstract

The utility model discloses a DAS system capable of flexibly expanding user capacity, which mainly comprises an MU unit, an EU unit and an RU unit, wherein the MU unit is additionally provided with at least one 4G baseband module on the basis of the AU unit, and the user capacity is expanded by increasing the number of the 4G baseband modules; the 4G baseband module is in butt joint with the AU unit through a CPRI interface, the AU unit is connected with the EU unit, the EU unit is connected with the RU unit, the AU unit mainly achieves a radio frequency signal access function, the EU unit mainly achieves expansion of an AU unit port, extension of transmission distance and control of transmission bandwidth, and the RU unit mainly achieves coverage of radio frequency signals on a specific area. The utility model has the advantages that: compared with the traditional DAS system technology, the method has the advantages that the 4G baseband module is added to the MU unit, so that the cost and engineering problems of new information sources added by operators are solved, and the user capacity can be flexibly expanded.

Description

DAS system capable of flexibly expanding user capacity

Technical Field

The utility model relates to a DAS system mainly is a DAS system that can expand user's capacity in a flexible way.

Background

Currently, a Distributed Antenna System (DAS) is generally used for signal amplification and coverage in indoor signal coverage, wherein a signal source of the DAS system realizes multi-source Access through radio frequency coupling of an AU unit (Access unit) and a base station device (BBU + RRU) (as shown in fig. 1).

In a multi-operator, multi-system and multi-band DAS system, base station equipment (BBU + RRU) with multiple operators, multiple systems and multiple frequency bands is required to provide an information source part required by the DAS system. At present, the DAS system only solves the indoor signal coverage problem, but needs to rely on new source equipment of an operator for increasing user capacity. With the deep development of 4G and the evolution of 4G + and the subsequent 5G, the demands of users in local hot spot areas on capacity, flow, speed and the like are increasingly vigorous, and a newly added information source required for capacity expansion becomes a big difficulty of the current DAS system.

At present, the user capacity expansion of the DAS depends on the increase of information sources (BBU + RRU) of operators, and the scheme has the defects of high cost, high total power consumption of the BBU + RRU and high equipment construction cost, so that the capacity expansion of partial hot spots is influenced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the not enough of prior art existence, and provide a DAS system that can expand user's capacity in a flexible way, adopted the MU unit (host computer unit) of taking the 4G baseband module to replace original AU unit to realized that user's capacity can expand in a flexible way, have overall cost low, the low power dissipation, need not extra computer lab, internet transmission, construction are simple and convenient, can dispose advantages such as in a flexible way.

The purpose of the utility model is accomplished through following technical scheme. A DAS system capable of flexibly expanding user capacity mainly comprises an MU unit, an EU unit and an RU unit, wherein the MU unit is added with at least one 4G baseband module on the basis of the AU unit, and the user capacity is expanded by increasing the number of the 4G baseband modules; the 4G baseband module is in butt joint with the AU unit through a CPRI interface, the AU unit is connected with the EU unit, the EU unit is connected with the RU unit, wherein the AU unit mainly realizes a radio frequency signal access function, digital signals of the 4G baseband module and 2G, 3G and 4G signals coupled through radio frequency form new digital signals, the EU unit mainly realizes the functions of expanding ports of the AU unit, extending transmission distance and controlling transmission bandwidth, and the RU unit mainly realizes the coverage of the radio frequency signals on a specific area.

Preferably, the 4G baseband module mainly comprises an IPSEC module, a 4G baseband processing module, a CPRI interface module, and a clock module, wherein the IPSEC module mainly implements an encryption/decryption function of interface data with an operator core network EPC, the 4G baseband processing module mainly implements processing of a 4G LTE protocol stack, and the CPRI interface module mainly implements standard CPRI packing and framing of baseband signals, and is connected to a CPRI interface of an AU unit; the clock module mainly realizes clock synchronization or the clock synchronization function of an external GPS and provides a synchronous clock for the module.

Furthermore, the 4G baseband module is a standard module, and different operators may correspond to different modules.

The utility model has the advantages that: compared with the existing traditional DAS system technology, the method has the advantages that the 4G baseband module is added to the MU unit, the problems that traditional BBU + RRU information source equipment is large in size, needs an additional machine room, is high in cost, high in power consumption, troublesome in construction and the like are solved, and flexible expansion of user capacity is achieved only by connecting to an operator core network (EPC) through the Internet and IPSEC technology.

Drawings

Fig. 1 is a block diagram of a conventional DAS system.

Fig. 2 is a schematic block diagram of the system of the present invention.

Fig. 3 is a block diagram of the 4G baseband module of the present invention.

Fig. 4 is a schematic diagram of an AU unit block of the present invention.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings:

As shown in fig. 2, a DAS system capable of flexibly extending user capacity mainly includes an MU unit (Master unit), an EU unit (Expansion unit), and an RU unit (Remote unit), where the MU unit adds at least one 4G baseband module on the basis of the AU unit, and in this example, 3 standard modules are adopted, and different operators may correspond to different modules, and the user capacity may be extended by adding the number of 4G baseband modules according to requirements. The 4G baseband module and the AU unit are butted through a CPRI interface to realize a full-standard digital interface. The AU unit is connected with the EU unit, the EU unit is connected with the RU unit, the AU unit mainly achieves a radio frequency signal access function, a digital signal of the 4G baseband module and 2G, 3G and 4G signals coupled through radio frequency form a new digital signal, the EU unit mainly achieves functions of expanding an AU unit port, extending transmission distance and controlling transmission bandwidth, and the RU unit mainly achieves coverage of the radio frequency signal on a specific area.

As shown in fig. 3, the 4G baseband module mainly includes an IPSEC module, a 4G baseband processing module, a CPRI interface module, and a clock module, where the IPSEC module mainly implements an encryption/decryption function of S1 interface data with an EPC (operator core network), and when data is transmitted through the Internet, data encryption security protection is performed through the IPSEC module. The 4G baseband processing module mainly realizes the processing of a 4G LTE protocol stack, and the CPRI interface module mainly completes the standard CPRI packing and framing of baseband signals and is connected with a CPRI interface of an AU unit; the clock module mainly realizes the synchronization of the 1588 clock of the port S1 or the clock synchronization function of an external GPS and provides the synchronous clock for the module to use.

As shown in fig. 4, the 4G baseband module supports modular plug and play, the S1, S2, and S3 interfaces of the 4G baseband module are connected to the corresponding operator core network (EPC, including security gateway) via the Internet, and besides implementing the conventional AU radio frequency signal access function, the AU unit is added with a CPRI interface. The new CPRI interface can be in butt joint with the 4G baseband module, thereby realizing the flexible expansion function of the user capacity. The FPGA of the AU unit can uniformly pack, frame and unframe standard CPRI data transmitted by the 4G baseband module and data after digitalized processing of 2G, 3G and 4G analog signals accessed by the traditional AU, and finally, the standard CPRI data and the data are subjected to digital-to-analog conversion and radio frequency amplification by the EU unit and signal coverage by the antenna feeder system.

Example (b): take a certain sports stadium as an example, specifically explain the utility model discloses a theory of operation: for a sports stadium, it is desirable that the signal coverage is "many and full", and all the 2G, 3G, 4G communication frequency band signals of all operators can be covered, so as to meet the requirements of holding different end users. The "instantaneous burst" of user capacity during a race is the primary consumer modality; therefore, on the competition day, the sports stadium user often experiences the conditions of 'signal satisfaction, but can not surf the internet' and the like, and the DAS system cannot solve the problem at present and must rely on a new information source added by an operator. The utility model discloses a take 4G baseband module's MU unit to replace original AU unit, just can solve user large capacity demand problem during the match fast. Besides the information source radio frequency coupling function of the original AU unit, a 4G baseband module based on Internet transmission is added and smoothly fused with the original DAS system, so that the user capacity can be flexibly expanded, and the method has the advantages of low overall cost, low power consumption, no need of additional machine rooms, Internet transmission, simplicity and convenience in construction, flexibility in configuration and the like.

It should be understood that equivalent substitutions or changes to the technical solution and the inventive concept of the present invention should be considered to fall within the scope of the appended claims for the skilled person.

Claims

1. A DAS system capable of flexibly expanding user capacity is characterized in that: the system comprises an MU unit, an EU unit and an RU unit, wherein the MU unit is added with at least one 4G baseband module on the basis of the AU unit; the 4G baseband module and the AU unit are in butt joint through a CPRI interface, the AU unit is connected with the EU unit, the EU unit is connected with the RU unit, and the digital signals of the 4G baseband module and the 2G, 3G and 4G signals coupled through radio frequency form new digital signals.

2. The DAS system of claim 1, wherein: the 4G baseband module consists of an IPSEC module, a 4G baseband processing module, a CPRI interface module and a clock module, and the CPRI interface module is connected with a CPRI interface of the AU unit.

3. The DAS system according to claim 1 or 2, wherein: the 4G baseband module is a standard module, and different operators correspond to different modules.