CN101365243A - Indoor Coverage Combination Technology of TD-SCDMA, WLAN and GSM - Google Patents

Abstract

The invention relates to an indoor coverage combining technology for three networks, namely TD-SCDMA, WLAN and GSM, wherein, the radio frequency signal of TD-SCDMA and the radio frequency signal of WLAN are connected with the input end of a combiner, and the input end of the combiner is connected with a GSM indoor aerial distribution system. The technology is successfully applied to Xiamen Branch of Fujian Mobile Communication Co., Ltd., and can solve the problem of multiplexing antenna feeder equipment due to multi-network coverage in indoor coverage for wireless data communications. Therefore, the technology has the advantages that the cost of network construction is lowered, the amount of engineering installation is reduced, the period of engineering construction is shortened, and the quality of network construction is improved, etc., thus providing a solution to quickly arranging indoor multi-network coverage.

Description

Indoor Coverage Combination Technology of TD-SCDMA, WLAN and GSM

technical field

The invention relates to a multi-network sharing technology for solving indoor coverage of wireless data communication, and belongs to the field of information management technology equipment.

Background technique

With the construction of China Mobile Group's TD-SCDMA3G network and the "e-trip" WLAN project, TD-SCDMA, WLAN and GSM indoor coverage three-network (multi-network) combination technology has been gradually applied. In order to maximize the newly increased investment benefits, it has become a common choice for operators to use an indoor distributed antenna system compatible with GSM, TD-SCDMA, and WLAN at the same time.

For operators, the co-location of TD-SCDMA and WLAN with GSM base stations and the shared indoor distribution system is an important issue. Make full use of the existing resources of GSM, thereby reducing the cost of 3G and WLAN network construction, shortening the construction period, and enhancing competitiveness.

Contents of the invention

The purpose of the present invention is to provide an indoor coverage combination technology of TD-SCDMA, WLAN and GSM triple network, which can reduce network construction cost, reduce project installation quantity, shorten project construction period, and improve network construction quality.

The indoor coverage combination technology of TD-SCDMA, WLAN and GSM three networks of the present invention is characterized in that: the wireless radio frequency signal of TD-SCDMA and the wireless radio frequency signal of WLAN are connected with the input end of combiner, the output of combiner The end is connected with the GSM indoor antenna distribution system.

The present invention has been successfully applied in Xiamen Branch of Fujian Mobile Co., Ltd., which can solve the problem of reuse of antenna feeder system equipment encountered in multi-network co-coverage in wireless data communication indoor coverage, and has the advantages of reducing network construction costs and project installation It provides a solution for the rapid deployment of indoor multi-network coverage.

Description of drawings

Fig. 1 is a schematic diagram of the system structure of the present invention;

Fig. 2 is a schematic diagram of a network model for antenna-feeder branch (end) combiner access;

Fig. 3 is a schematic diagram of a network model for antenna-feeder trunk (trunk) combiner access;

FIG. 4 is a schematic diagram of multi-combination across branches in the present invention.

Detailed ways

The indoor coverage combination technology of TD-SCDMA, WLAN and GSM three networks of the present invention, the wireless radio frequency signal of TD-SCDMA and the wireless radio frequency signal of WLAN are connected with the input terminal of combiner, the output terminal of combiner and GSM indoor The antenna distribution system is connected.

The wireless radio frequency signal of the above WLAN is composed of a wireless link access device AP and a trunk amplifier. The wireless link access device AP enters the trunk amplifier, and the output of the trunk amplifier is connected to the input terminal of the combiner, and then connected to the GSM indoor antenna distribution system.

The above-mentioned wireless link access device AP is connected to a power splitter, the output of the power splitter is respectively connected to the input of several trunk amplifiers, and the output of the trunk amplifier is respectively connected to the input of each combiner.

1. Basic principles

The basic design principle of the three-network combination technology is to feed the radio frequency signals of TD-SCDMA and WLAN into the GSM indoor coverage system through the combiner, and the signals of each frequency band share the indoor antenna distribution system for coverage. The network and the WLAN network are independent of each other, but the three radio frequency signals share the same indoor antenna feeder transmission system through the multi-frequency combiner device, as shown in Figure 1.

Before carrying out the reconstruction of the three-network combination project, it is necessary to check whether the supported frequency band range of all passive components and antennas in the original GSM coverage system meets the broadband requirements after the combination, and can transmit the following three network frequency bands at the same time:

In the indoor antenna distribution system, the passive components cannot meet the requirements of the above three network frequency bands, or because the antenna installation position of the 2G indoor antenna distribution system cannot meet the requirements of 2.4G and 3G network coverage, the design signal cannot be achieved. In the case of coverage intensity, etc., the original indoor antenna distribution system needs to be replaced with broadband devices or the network structure is transformed to realize the combination of three networks.

2. The network model of branch and trunk combined access

During the reformation of the three-network combination, the relevant components mainly include combiners, power splitters, couplers, antennas, etc. In addition, the components that affect the combination effect include antenna feeders and feeder connectors. The insertion loss and line loss caused by the passage of radio frequency signals in the frequency band are different. Among them, the impact on 2G and 3G signals is small, but the impact on 2.4G high-frequency signals of WLAN is the greatest. The following is the 2.4G high-frequency signals of WLAN. The combined antenna-feeder branch road and the main antenna-feeder road are analyzed:

1. The network model of antenna-feeder branch (end) combiner access (as shown in Figure 2)

The network model in the above figure is the simplest combination method. The WLAN network is directly injected into the antenna feeder system through its own RF output. According to the power limit requirements of the National Radio Regulatory Commission for 2.4G frequency band equipment, the maximum output of the AP is generally 100mW (20dBm) , due to the limited power, the simple and direct combination method is only suitable for the relatively simple scheme of the antenna feeder system, or the combination is performed at the end of the branch of the antenna feeder. If the coverage area is small, the simplest combination method can be used. way to carry out wireless signal coverage.

2. The network model of antenna-feeder main road (trunk) combiner access (as shown in Figure 3)

The network model in Figure 3 is the way of adding dry amplifiers to the WLAN network. After the combination, the WLAN system signal is directly fed into the GSM indoor antenna distribution system, and the multi-system indoor antenna and feeder shared system antenna covers the user hotspot area. However, due to the limited transmit power of the AP (the national standard is no more than 100mw), after layers of branches in the antenna feeder system, the lack of power when the signal reaches the end will become a factor restricting the application of triple play. In order to make the signal of a single AP cover a larger area and ensure that the antenna feeder system has enough 2.4G band WLAN signal power input, a WLAN power amplifier needs to be used in the project to enhance the signal output of the AP and amplify the AP signal. At present, the 2.4G power amplifier products available in the market have specifications such as 500mW, 1W, 2W, 4W and 5W. In addition, we can also customize equipment with higher specifications from equipment manufacturers according to the needs of actual networking.

In large open hotspot areas, in order to reduce the number of APs, reduce equipment investment, purify the channel environment, reduce channel interference, and expand the signal coverage of a single AP, the technology of multi-channel combining across branches can be used (as shown in Figure 4 ).

Adopting this combining method avoids the influence of unfavorable factors caused by the trunk combining technology, and can be used as one of the alternative ways of trunk combining.

Antenna-feeder main road (trunk) combined access mode is suitable for expanding the signal coverage area, the number of users is not concentrated, and there is no sudden user peak. When the network coverage is expected to be more in the area with a large number of users, it should be used Add AP devices that support load balancing for combined access to improve network stability and service quality.

Claims (3)

1. the indoor covering path combining technique of a TD-SCDMA, WLAN and GSM three nets, it is characterized in that: the radio frequency signal of TD-SCDMA is connected with the input of mixer with the radio frequency signal of WLAN, and the output of mixer is connected with GSM domestic aerial compartment system.

2. according to the indoor covering path combining technique of claims 1 described TD-SCDMA, WLAN and GSM three nets, it is characterized in that: the radio frequency signal of WLAN is made up of Radio Link access device AP and trunk amplifier, Radio Link access device AP incoming trunk amplifier, the output of trunk amplifier is connected to the input of mixer, is connected to GSM domestic aerial compartment system.

3. according to the indoor covering path combining technique of claims 1 and 2 described TD-SCDMA, WLAN and GSM three nets, it is characterized in that Radio Link access device AP is connected to power splitter, the output of power splitter is connected respectively to the input of several trunk amplifiers, and the output of trunk amplifier connects the input of each mixer more respectively.

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