CN1859035A - Wireless signal area coverage method and wireless access network - Google Patents

Abstract

The invention discloses a method for covering a wireless signal area and a wireless access network for realizing the method, which are used for solving the problems of larger interference to signals outside the area and higher covering cost when the existing wireless network covers the area. The method comprises the following steps: the base station transmits downlink wireless signals at a set frequency point outside the frequency band occupied by the wireless network and receives uplink wireless signals; the repeater receives a downlink wireless signal of the base station, converts a working frequency point of the downlink wireless signal into a frequency band occupied by the wireless network and transmits the working frequency point, or receives an uplink wireless signal transmitted by the terminal in the frequency band occupied by the wireless network, converts the uplink wireless signal into the set frequency point and transmits the set frequency point, so that the wireless signal transmitted between the base station and the repeater works on the set frequency point. The network comprises a base station working at a set frequency point and a repeater for performing frequency conversion.

Description

Wireless signal area coverage method and wireless access network

technical field

The invention relates to wireless communication technology, in particular to wireless network coverage technology, and discloses a method for area coverage of wireless signals and a wireless access network for realizing the method.

Background technique

At present, when mobile operators provide broadband services through the third generation mobile communication system (3G, The Third Generation), one of the difficulties they face is the problem of indoor coverage. Usually, the method of using outdoor base stations to cover indoor scenes is very difficult and complicated in technical implementation. It cannot provide suitable wireless signals for indoors to realize indoor wireless broadband services. In order to solve this problem, the scheme of adding transmission units or increasing the number of repeaters in the room is generally adopted at present. The specific methods include the following four types:

The first method is to build a base station near a building that requires indoor coverage, and arrange multiple indoor antennas in the building to achieve indoor coverage. This method requires the installation of feeders and antennas within the building (or replaces the antenna with leaky cables), and uses multiple carrier frequencies to increase capacity, thereby increasing the complexity of network planning.

The second method is to achieve indoor coverage by installing multiple scattered picocell base stations indoors. The main problem with this method is that the transmission between the picocells and the network is very difficult, and it needs to be used to increase the capacity as in the first method. Multiple carrier frequencies also increase the complexity of network planning.

The third method is to achieve indoor coverage by installing multiple scattered repeaters indoors. In this method, the indoor repeater still uses the frequency that exists outdoors. In order to avoid interference to outdoor signals, the repeater The power of the network should not be too large, which will lead to the loss of indoor coverage capacity. Same as the previous two methods, there is also the disadvantage of using multiple carrier frequencies to increase capacity, which increases the complexity of network planning.

The fourth method is to move and convert the frequency band between the working frequency point used by the base station and the working frequency point of the repeater station installed indoors through the frequency-shifting repeater. As shown in Figure 1, the frequency-shifting repeater set near the base station The station transfers the F0 frequency point signal sent by the base station to the F1 frequency point signal and sends it. The frequency shift repeater station installed in the building receives the F1 frequency point signal and restores it to the F0 frequency point signal for transmission, which is received by the indoor receiving terminal. Compared with the first three methods, this method has the advantage that when the signals received indoors are transmitted outdoors, the frequencies of the signals received indoors and outdoors are different, which reduces the interference of indoor signals to outdoor signals to a certain extent.

However, in Method 4, the repeater is relatively close to the donor base station, and the uplink noise of the repeater is introduced into the donor base station, thereby reducing the receiving sensitivity of the receiver of the donor base station, reducing the coverage of the donor base station, and even leading to a drop rate and an increase in bit error rate. Because the signal between the base station and the nearby repeater works in the frequency band of the 3G system, it has caused great interference to the base station signal, so the repeater near the base station has not been used on a large scale, especially in the code There are fewer applications in CDMA (Code Division Multiple Access) systems. Moreover, in this method, there is one frequency conversion for the transceiver of the near-end unit and one frequency conversion for the transmission and reception of the far-end unit. The two frequency conversions deteriorate the signal quality and cannot achieve good coverage indoors. The output power is used to improve the signal quality, but this method cannot use digital power amplifier technology. For analog technology, the increase in power will generate greater interference, so that the signal quality cannot be improved and the operating cost of the base station can be reduced by increasing the RF output power. .

In the above four existing solutions, the operator is required to install equipment in the covered building, which greatly increases the cost of the operator's indoor coverage.

Contents of the invention

The invention discloses a method for area coverage of wireless signals and a wireless access network for realizing the method, which are used to solve the problems of relatively large interference to signals outside the area and high coverage costs when the existing wireless network performs area coverage .

A method for regional coverage of wireless signals according to the present invention comprises the following steps:

The base station transmits a downlink wireless signal at a set frequency point other than the frequency band occupied by the wireless network, so that the downlink wireless signal is transmitted at the set frequency point;

The repeater in the area receives the downlink wireless signal from the base station, converts the working frequency of the downlink wireless signal into the frequency band occupied by the wireless network, and transmits it.

The method further includes the step of: the terminal of the wireless network receives the downlink wireless signal in the area.

Described method also comprises the steps:

The repeater receives the uplink wireless signal transmitted by the terminal in the frequency band occupied by the wireless network, converts the uplink wireless signal to the set frequency point and transmits it, so that the uplink wireless signal is at the set frequency point to transmit;

The base station receives the uplink wireless signal at the set frequency point.

The wireless network is a wireless broadband network.

The set frequency point is 3.5GHz frequency point.

The present invention also discloses a wireless access network for regional coverage, including: a base station controller, a first base station connected to the base station controller through an interface, and a repeater wirelessly connected to the first base station; the repeater is located at In the area, receiving a wireless signal, converting the working frequency of the wireless signal, and then transmitting;

The wireless signal includes the downlink wireless signal transmitted by the first base station to the repeater at the set frequency point, and the downlink wireless signal is converted by the repeater into the frequency band occupied by the network and Launch into the area.

The wireless signal also includes an uplink wireless signal within the frequency band occupied by the network received by the repeater from the area, and the uplink wireless signal is converted to the set frequency point by the repeater and transmit to the first base station for reception.

The network also includes a second base station connected to the base station controller through an interface, and the second base station receives uplink wireless signals within the frequency band occupied by the network within the frequency band occupied by the network, or transmits an uplink wireless signal within the frequency band occupied by the network Downlink wireless signals within the frequency band.

The repeater includes two sets of filters, frequency converters and power amplifiers which are connected in sequence, respectively filtering uplink wireless signals or downlink wireless signals, converting working frequency points and amplifying signals.

The network is a wireless broadband access network.

When the covered area is large, multiple repeaters are set in parallel in the area.

The beneficial effects of the present invention are as follows:

1. The present invention utilizes the frequency error method to use unused frequency band resources for regional coverage, which does not need to occupy existing spectrum resources and does not interfere with other signals, especially for indoor coverage in 3G networks , the existing 3G spectrum resources are fully utilized and can be used for any user equipment supporting 3G;

2. Compared with the frequency shifting method, the method of the present invention does not need to set up a repeater at the base station annex, and instead uses a dedicated base station to directly transmit wireless signals at the frequency point of the wrong frequency band, thereby avoiding the interference of the repeater to the base station;

3. Since the method of the present invention uses a repeater to realize signal transmission, it is not necessary to install network transmission equipment in the coverage area, for example, in a building. In contrast, the time required for installation is short and the process is few, thus improving the network construction. speed and efficiency;

4. As long as a base station working on a frequency band that is staggered from the network frequency band is established in the community, users can install repeater equipment that converts frequencies according to their needs to achieve regional coverage or improve the quality of regional coverage signals, without the need for operators to install Own equipment reduces the operator's installation and maintenance workload to a certain extent, and reduces the operator's network construction cost;

5. Since the repeater station in the coverage area works in the frequency band outside the coverage area signal, it will not cause interference to the outdoor signal. Compared with the frequency shifting station method in the prior art, the transmission power can be increased appropriately, so it can realize The continuity of the signal in the coverage area and the signal outside the coverage area can easily support the handover when the terminal moves between the inside and outside of the coverage area.

The area coverage method and network described in the method are especially suitable for residential areas with relatively dense building groups, and simultaneously realize indoor coverage of multi-point areas.

Description of drawings

FIG. 1 is a schematic diagram of indoor coverage of one floor of a multi-storey building realized by using a frequency shift repeater in the prior art;

Fig. 2 is the schematic diagram of the principle of utilizing the frequency-staggered repeater to realize the indoor coverage of one of the floors in the multi-storey building according to the present invention;

Fig. 3 is a schematic diagram of a network structure utilizing frequency-staggered repeaters to realize indoor coverage according to the present invention;

Fig. 4 is a structural schematic diagram of a frequency-staggered repeater;

FIG. 5 is a schematic flow diagram of terminal access when using a frequency-staggered repeater to achieve indoor coverage according to the present invention;

Fig. 6 is a schematic diagram of an uplink wireless signal transmission process when using a frequency-staggered repeater to achieve indoor coverage according to the present invention;

Fig. 7 is a schematic diagram of the flow of downlink wireless signal transmission when frequency-staggered repeaters are used to realize indoor coverage according to the present invention.

Detailed ways

The method of the invention avoids the frequency spectrum resource used by the existing wireless network by utilizing the principle of frequency staggering, achieves the purpose of area coverage through the frequency conversion of the repeater, and reduces the interference to the network. The method of the present invention can be applied to all wireless networks. If the cost of building base stations is considered, the method and network described in the method are especially suitable for residential areas with relatively dense building groups, and simultaneously realize indoor coverage of multi-point areas. In the following, the implementation of indoor coverage by a 3G broadband access network will be described in detail in conjunction with the accompanying drawings.

The working frequency band of the 3G wireless signal transmitted by the 3G broadband network is about 2.1 GHz. This embodiment takes the 3.5 GHz frequency point outside the 3G frequency band as an example for illustration. It should be noted that the frequency error directly proposed in this embodiment Station release is to realize the frequency error between 3G frequency band and 3.5GHz. Other frequency points outside the frequency band of 3G wireless signals can be used, not limited to 3.5GHz, such as 3GHz, 3.8GHz, 4GHz, etc. can be used. If the cell is a mixed coverage cell, in order to prevent interference with other coverage networks, it is necessary to avoid the frequency bands occupied by these networks and select frequency points for erroneous frequencies. Using frequency bands that are not used in other outdoor coverage signals to perform frequency staggering belongs to the equivalent replacement method of the method of the present invention.

As shown in Fig. 2 and Fig. 3, Fig. 2 is a schematic diagram of the principle of utilizing the frequency-staggered repeater to realize the indoor coverage of one floor in a multi-storey building according to the present invention, and Fig. 3 applies the utilization of the frequency-staggered repeater according to the present invention Schematic diagram of the network structure for indoor coverage. In order to realize the method of the present invention, the existing 3G broadband access network needs to add a special base station operating at a frequency of 3.5 GHz in the cell in the area where coverage needs to be realized, and set the frequency conversion frequency in the coverage area. Repeater, the present invention is referred to as frequency-staggered repeater, thus, the 3G broadband access network of the present embodiment comprises following several parts:

1. The base station controller is connected to the core network through the Iu interface, and the core network provides various broadband services for the connected terminals;

2. The base station working in the 3G frequency band is connected to the base station controller through the Iub interface, and works within the 3G frequency band to receive or transmit the uplink and downlink wireless signals of the 3G frequency band to realize the outdoor coverage of the cell;

3. The base station working at the 3.5GHz frequency point and the repeater station installed in the building that needs to be covered are used to achieve indoor coverage. The base station is also connected to the base station controller through the Iub interface, and receives or transmits at the 3.5GHz frequency point Wireless signal, so that the signal between the repeater and the base station works at the 3.5GHz frequency point, and the repeater station receives the downlink wireless signal at the 3.5GHz frequency point transmitted by the base station, converts it into a 3G frequency band and transmits it to the coverage area; or repeater The station receives the uplink wireless signal in the 3G frequency band sent by the terminal in the coverage area, converts the frequency point of the uplink wireless signal to the 3.5GHz frequency point and transmits it to the base station, and the base station receives it at the 3.5GHz frequency point and reports it to the base station through the Iub interface controller.

If it is necessary to cover a large sub-area or a high-rise building, and a frequency-staggered repeater cannot fully cover it, multiple frequency-staggered repeaters can be set in parallel.

The base station in this embodiment works at a frequency of 3.5 GHz, so all system messages transmitted by the base station include 3.5 GHz signals. In order to meet the 3G signal received and transmitted by the transceiver of the base station at the 3.5GHz frequency point, the following requirements stipulated in the agreement need to be met:

1. Support 3G standard;

2. Relevant rules for 3.5GHz frequency point wireless performance indicators, such as spectrum emission template, output power, spurious, etc.

The above-mentioned standards and rules are specified in related agreements, which can be referred to when setting up the base station.

As shown in Figure 4, Figure 4 is a schematic structural diagram of a frequency-staggered repeater. Each link generally includes receiving/transmitting antennas, duplexers, filters, power amplifiers and other main modules. Similar to the frequency workstation, after selecting the frequency point for frequency error, set the relevant parameters of the frequency converter and antenna to meet the required frequency requirements. To repeat, the processing process of the wireless signal by the frequency error repeater is as follows:

From the perspective of the uplink, the wireless signal received by the antenna is in the 3G working frequency band. After being filtered by the duplexer and filter to the frequency converter, the signal is converted to the 3.5GHz frequency point, and then amplified by the power amplifier. Worker, antenna transmission, to achieve connection with the base station;

From the downlink point of view, the wireless signal received by the antenna is at the 3.5GHz operating frequency point. After being filtered by the duplexer and filter to the frequency converter, the signal is converted to the 3G frequency band, and then amplified by the power amplifier. The device and antenna transmit, and the signal reaches the terminal.

Similarly, the frequency error repeater must also meet the performance indicators specified in the 3G standard. Because the uplink and downlink of the 3G system has fast power control technology, if the frequency error repeater does not work at a fixed amplification factor, the link will be unstable and affect the accuracy of power control. In order to ensure the effective power control function of the 3G system to implement this method, the frequency-staggered repeater should work at a fixed amplification factor, such as the output signal power should be a linear amplification of the input signal power.

There are two different application modes for frequency error repeater, dedicated mode and public mode. The application of the former is that the final user owns the frequency-staggered repeater, which can be installed in any place. The end-user cannot change the working state of the frequency-staggered repeater, and the output power of the frequency-staggered repeater is limited. In the public mode, 3G wireless operators have frequency-staggered repeaters, which have greater output power than the former, and provide remote maintenance functions more strictly in accordance with requirements. Operators can adjust their working status, such as changing the maximum rated output power .

Through the above network, the 3.5GHz frequency wireless signal is transmitted between the base station operating at the 3.5GHz frequency point and the frequency-staggered repeater station, realizing good coverage of indoor 3G frequency band signals. Because repeaters are used for signal transmission, there is no need to install network transmission equipment in coverage areas, such as buildings, so the time required for network construction is short and the process is small, thereby improving the speed and efficiency of network construction. And as long as the base station working at the wrong frequency point is established in the community, the user can install the frequency conversion repeater equipment according to the need to achieve area coverage or improve the quality of the area coverage signal, without the need for the operator to install its own equipment. To a certain extent, the operator's installation and maintenance workload is reduced, and the operator's network construction cost is reduced.

Different from the existing frequency shifting working method, the frequency shifting repeater consists of two parts, the near-end unit and the far-end unit. The frequency shifting transmission mainly uses frequency shifting between the near-end unit and the far-end unit. The base station has produced a lot of interference, and the wireless signal that the present invention realizes indoor coverage is transmitted between the base station and the repeater, and the wireless signal transmitted between the base station and the repeater works at a frequency of 3.5 GHz, which is harmful to the existing The outdoor coverage of the system does not have any impact.

As shown in Figure 5, the present invention is further described by taking the access process of a terminal as an example:

s11. The wrong-frequency repeater receives the access request of the terminal, and converts the access request to a 3.5GHz frequency point for transmission;

s12. The base station receives the access request of the terminal at the 3.5GHz frequency point, and reports the access request to the network through the Iub interface;

s13. The wireless network authenticates the terminal according to the information carried in the access request, and records the authentication result;

s14. The network returns a response message of the authentication result of the terminal to the base station through the Iub interface;

s15. After receiving the authentication result response message, the base station transmits on the 3.5GHz frequency point;

s16. The wrong-frequency repeater receives the wireless signal at the 3.5GHz frequency point, and switches to the 3G frequency band for transmission after receiving the authentication result response message;

s17. The terminal receives the response message of the 3G frequency band.

If the authentication is passed, the terminal is connected to the broadband network through the frequency error repeater and the base station, and the signal interaction between the terminal and the network is divided into uplink and downlink:

As shown in Figure 6, the transmission process of the uplink wireless signal is:

s21. The frequency-staggered repeater receives the uplink wireless signal in the 3G frequency band transmitted by the terminal, and converts the uplink wireless signal to a 3.5GHz frequency point for transmission;

s22. The base station receives an uplink wireless signal at a frequency point of 3.5 GHz;

s23. The base station reports the received uplink wireless signal to the network through the Iub interface.

As shown in Figure 7, the transmission process of the downlink wireless signal is:

s31. The base station receives the downlink wireless signal of the network through the Iub interface;

s32. The base station receives and transmits downlink wireless signals at a frequency of 3.5 GHz;

s33. The frequency-staggered repeater receives the downlink wireless signal at the 3.5GHz frequency point;

s34. The frequency-staggered repeater converts the 3.5GHz frequency point downlink wireless signal to the 3G frequency band and transmits it;

s35. The terminal receives the downlink wireless signal on the 3G frequency band.

To sum up, without adding a special 3.5GHz terminal, the purpose of using the 3.5GHz frequency point for indoor coverage is achieved.

The frequency staggering method used in the present invention uses unused frequency band resources for regional coverage, which does not need to occupy existing spectrum resources and does not interfere with other signals, especially when used to achieve indoor coverage in 3G networks. The existing 3G spectrum resources are fully utilized and can be used for any user equipment supporting 3G. Since the repeater in the coverage area works in a frequency band outside the coverage area signal, it will not cause interference to outdoor signals. Compared with the frequency shifting station method in the prior art, the transmission power can be increased appropriately, so the coverage area can be realized The continuity of signals within the coverage area and signals outside the coverage area can easily support terminal switching.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (11)

1, a kind of area coverage method of wireless network signal is characterized in that, comprises the steps:

Transmitting downstream wireless signal on the frequency is set at one beyond the frequency range that described wireless network takies in the base station, and described downstream wireless signals is transmitted on described setting frequency;

Repeater in the described zone receives the described downstream wireless signals of base station, and the working frequency points of this downstream wireless signals is transformed into frequency range that described wireless network takies with interior and emission.

2, the method for claim 1 is characterized in that, also comprises step: the terminal of described wireless network receives described downstream wireless signals in described zone.

3, method as claimed in claim 2 is characterized in that, also comprises the steps:

The repeater receives the up-link wireless signal that described terminal is launched in the frequency range that described wireless network takies, this up-link wireless conversion of signals is also launched to described setting frequency, and this up-link wireless signal is transmitted on described setting frequency;

The base station receives described up-link wireless signal on described setting frequency.

4, as claim 1,2 or 3 described methods, it is characterized in that described wireless network is a wireless broadband network.

5, method as claimed in claim 4 is characterized in that, described setting frequency is the 3.5GHz frequency.

6, a kind of Radio Access Network of realizing that the zone covers comprises: base station controller, connect first base station of this base station controller and the repeater of this first base station of wireless connections by interface; Described repeater is arranged in described zone, launches after the working frequency points of reception wireless signal, the described wireless signal of conversion; It is characterized in that:

Described wireless signal comprises that described first base station is transmitted to the downstream wireless signals of described repeater on described setting frequency, and this downstream wireless signals is transformed into frequency range that described network takies with interior and be transmitted into described zone by described repeater.

7, network as claimed in claim 6, it is characterized in that, described wireless signal also comprises frequency range that described network that described repeater receives takies with interior up-link wireless signal from described zone, this up-link wireless signal is transformed on the described setting frequency by described repeater and is transmitted to described first base station and receives.

8, as claim 6 or 7 described networks, it is characterized in that, described network also comprises second base station that connects described base station controller by interface, the frequency range that the frequency range that this second base station takies at described network takies with the described network of interior reception is with interior up-link wireless signal, or launches frequency range that described network takies with interior downstream wireless signals.

9, network as claimed in claim 8 is characterized in that, described repeater comprises filter, frequency converter and the power amplifier that two covers connect in turn, respectively up-link wireless signal or downstream wireless signals is carried out filtering, working frequency points conversion and signal amplification.

10, network as claimed in claim 9 is characterized in that, described network is a wireless wideband access network.

11, as claim 6 or 7 described networks, it is characterized in that, described repeater in described zone parallel be set to a plurality of.

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