WO2013174007A1

WO2013174007A1 - System and method for inter-site wireless interconnection as well as site

Info

Publication number: WO2013174007A1
Application number: PCT/CN2012/076060
Authority: WO
Inventors: 谢汉雄; 谭育旺; 黄成富; 王刚; 郭義祥; 张学军
Original assignee: 海能达通信股份有限公司
Priority date: 2012-05-25
Filing date: 2012-05-25
Publication date: 2013-11-28

Abstract

Disclosed are a system and a method for inter-site wireless interconnection as well as a site. The system comprises a plurality of sites. At least one site comprises an access layer transit station (21) and a link layer transit station (22) connected to each other through internet links. Other sites comprise at least an access layer transit station (11). The access layer transit stations (11, 21) are used for system access of a terminal. The link layer transit station (22) is used for wireless interconnection between the sites. Each transit station can transmit and receive signals by using the same frequency but different time slots. According to the present invention, the frequency resources can be saved, and the equipment complexity can be lowered.

Description

TECHNICAL FIELD The present invention relates to the field of communications technologies, and in particular, to an inter-site wireless interconnection system, method, and station. Background Art In wireless communication, the communication range of a terminal is generally limited, so it is necessary to increase a relay device to increase the coverage of a signal. In the wireless intercom system, the repeater plays an extremely important role in increasing the communication distance and expanding the coverage. It is an indispensable important device for professional wireless communication systems.

The repeater is generally designed as a power amplifying device that effectively increases the coverage of wireless communication. Currently, the conventional DMR (Digital Mobile Radio) repeater adopts TDMA (Time Divide Multi Address) mode, which occupies two Frequency point, realize transceiving inter-frequency, double-slot independent work.

Since the repeater needs to transmit and receive at different frequencies at the same time, in order to avoid interference between the transceiver, the repeater needs to be equipped with a duplexer, which not only occupies more frequency resources, but also increases equipment overhead, and the structure is complicated. Especially for small-scale systems, this problem will become more apparent.

In addition, in the prior art, since the relay stations cannot communicate directly through the air interface radio frequency, the intermediate stations need to be interconnected, and the signal conversion is required, such as converting the DMR signal into a third-party protocol format, and then accessing the The transmission of the three-party public network (such as IP network, E1 wireless transmission network, etc.) not only affects its scalability, but also the conversion process is complicated. SUMMARY OF THE INVENTION The embodiments of the present invention provide an inter-site wireless interconnection system, method, and site for the above problems existing in the prior art, to save frequency resources and reduce device complexity.

To this end, the embodiments of the present invention provide the following technical solutions:

An inter-site wireless interconnection system, including: multiple sites;

At least one of the stations includes: an access layer relay station and a link layer relay station connected by an internet link; Other sites include at least: access layer repeater;

The access layer relay station is used for the terminal to perform system access; the link layer relay station is used for wireless interconnection between stations; each of the relay stations adopts a working mode of transmitting and receiving the same frequency but different time slots for transmitting and receiving. The inter-site wireless interconnection method, the station includes: an access layer relay station and a link layer relay station connected through an internet link; each of the relay stations uses a working mode of transmitting and receiving the same frequency but different time slots to transmit and receive signals;

The method includes:

Terminal access through the access layer relay station in the site;

The wireless interconnection between the stations is performed through the link layer relay station in the site; the link layer relay station and the access layer relay station in the same site are connected through the Internet link.

A station includes: an access layer relay station and a link layer relay station connected through an internet link; the access layer relay station is used for terminal accessing the system; and the link layer relay station is used for a site Wireless interconnection; Each repeater uses the same frequency but different time slots to transmit and receive signals.

The inter-site wireless interconnection system, method and station provided by the embodiment of the invention provide a link layer relay station connected to the access layer relay station through the Internet link in the station, and realize wireless between the stations by using the link layer relay station. Interconnection, so there is no need to add additional hardware conversion equipment and overhead, and the networking is flexible and extensible.

Since each relay station uses a single frequency and different time slots to transmit and receive signals, it can effectively save frequency points and duplexers, reduce the probability of frequency conflicts, and improve the stability of the system.

In addition, the stations are interconnected wirelessly, which is insensitive to the Doppler effect, and the stations can still achieve better call performance when they are in a mobile state.

DRAWINGS

1 is a schematic diagram of networking of Embodiment 1 of an inter-site wireless interconnection system according to the present invention;

2 is a schematic diagram of networking of Embodiment 2 of the inter-site wireless interconnection system of the present invention;

3 is a schematic diagram of networking of Embodiment 3 of the inter-site wireless interconnection system of the present invention;

4 is a schematic diagram of timing synchronization of a repeater in an embodiment of the present invention;

5 is a schematic diagram of synchronous transmission or reception of a relay station in the same station in the embodiment of the present invention; 6 is a flowchart of a method for wireless interconnection between sites according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a station of an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The conventional conventional repeater is designed as a device for signal amplification and relay, and provides a synchronization reference signal for the terminal device, but does not have the function of synchronizing to another reference signal, and the communication of the DMR protocol must be based on This can only be done after the devices have been synchronized. Since the synchronization reference signals of each repeater are relatively independent, synchronization between the repeaters cannot be achieved, and direct interconnection between the repeaters cannot be achieved, and a third-party public network is required.

In response to the above problems, the inter-site wireless interconnection system and method of the present invention implements a link layer relay station connected to an access layer relay station through an Internet link in the station, and implements a link between the stations by using a link layer relay station. Wireless interconnection. The access layer relay station is mainly used for the terminal to perform system access. On the one hand, the terminal transmitting signal of the uplink channel is transited and forwarded to the link layer relay station through the Internet link, and the link layer relay station performs site interconnection. On the other hand, the signal transmitted by the link layer relay station through the Internet link is transferred. The link layer relay station is mainly used for wireless interconnection between stations. On the one hand, the uplink channel is transmitted from the link layer of another station, and is forwarded to the access layer relay station through the Internet link. The layer calls the end user; on the other hand, the signal transmitted by the access layer through the Internet link is transited.

The embodiments of the present invention are further described in detail below in conjunction with the drawings and embodiments.

Example 1

FIG. 1 is a schematic diagram of a basic networking of a wireless interconnection system between stations according to an embodiment of the present invention.

In this embodiment, the system includes: a site 1 and a site 2, wherein the site 1 is provided with an access layer relay station 11 , and the site is provided with an access layer relay station 21 and a link layer relay station 22, The inbound repeater 21 and the link layer repeater 22 are connected by an internet link.

In the system of the present invention, each of the relay stations (including the access layer relay station and the link layer relay station) adopts a working mode of transmitting and receiving the same frequency but different time slots to transmit and receive signals. Therefore, frequency points and duplexers can be effectively saved, the probability of occurrence of frequency conflicts can be reduced, and the stability of the system can be improved.

It should be noted that, in the system of the embodiment of the present invention, in order to avoid co-frequency interference between adjacent stations Interference, the access layer repeater of the adjacent station uses different frequencies; the link layer repeater of the adjacent station uses the same frequency; the access layer repeater and the link layer repeater within the same site use different frequencies.

The process of implementing call connection by the terminal using the wireless internet system of the embodiment of the present invention will be described in detail below with reference to FIG.

As shown in FIG. 1, when the terminal S1 calls the terminal S2, the terminal S1 initiates a call; after receiving the call, the access layer relay station 11 of the station 1 wirelessly forwards the call to the link layer relay station of the station 2 22; the link layer relay station 22 converts the call signal, such as analog-to-digital conversion, encapsulation into an IP data packet, etc., and then transmits it to the access layer relay station 21 through the Internet link; the access layer relay station 21 will The received IP data packet is sent after decapsulation, digital-to-analog conversion, and the like, and the terminal S2 receives the call, thereby implementing the call from the terminal S1 to the terminal S2.

Correspondingly, when the terminal S2 calls the terminal S1, the terminal S2 initiates a call; after receiving the call, the access layer repeater 21 of the station 2 performs signal conversion, such as analog-to-digital conversion, encapsulation into an IP data packet, and the like. And then transmitted to the link layer relay station 22 through the Internet link; the link layer relay station 22 performs decapsulation, digital-to-analog conversion and the like on the received IP data packet, and then sends the data to the access layer relay station 11 by wireless means. The access layer relay station 11 delivers the call, and the terminal S1 receives the call, thereby implementing the call from the terminal S2 to the terminal S1.

In the above call process, the link layer relay station 22 prohibits transmission when receiving signals by wireless means; when transmitting signals by wireless means, reception is prohibited.

In the embodiment of the present invention, a inter-site wireless interconnection system is provided, and a link layer relay station connected to the access layer relay station through an Internet link is set in the station. Since the link layer relay station is used to realize the wireless interconnection between the stations, no additional hardware conversion equipment and overhead are required, and the networking is flexible and extensible. Since each repeater uses a single frequency and different time slots to transmit and receive signals, it can effectively save frequency points and duplexers, reduce the probability of frequency conflicts, and improve the stability of the system. Moreover, the terminal does not need to activate the access layer repeater to achieve a faster access system.

It should be noted that FIG. 1 illustrates only two sites as an example. In an actual networking, there may be any multiple sites, at least one of which includes: an access layer transit station connected through an Internet link and The link layer repeater is described in detail below.

Example 2

As shown in FIG. 2, it is another networking diagram of the inter-site wireless interconnection system according to the embodiment of the present invention. In this embodiment, the system includes three sites, Site 1, Site 2, and Site 3. Each station is provided with an access layer relay station and a link layer relay station. As shown in FIG. 2, the station 1 includes: an access layer relay station 11 and a link layer relay station 12. The station includes: an access layer relay station 21 and a link layer relay station 22. The station 3 includes: an access layer relay station 31 and a link layer relay station 32. The access layer relay station and the link layer relay station in each station are connected by an Internet link.

It should be noted that, in the inter-site wireless interconnection system according to the embodiment of the present invention, in order to avoid co-channel interference between adjacent stations, the access layer relay station of the adjacent station uses different frequencies; the link layer relay station of all stations Use the same frequency; the access layer repeater and link layer repeater in the same site use different frequencies.

Taking the networking mode shown in FIG. 2 as an example, when the terminal S2 issues a call, the access layer relay station 21 receives the call, and the call is relayed in a wireless manner, thereby being received by the terminal S3 in the same site as the terminal S2. At the same time, the call is also subjected to signal conversion, such as analog-to-digital conversion, encapsulation into IP data packets, etc., and then transmitted to the link layer relay station 22 through the Internet link, and then wirelessly by the link layer relay station 22 The call is transmitted to the link layer relay station 12 of station 1 and the link layer relay station 32 of station 3. The link layer relay station 12 transmits the call to the access layer relay station 11 via the Internet link, and is finally received by the terminal S1 in the station 1; the link layer relay station 32 transmits the call to the access through the Internet link. The layer repeater 31 is finally received by the terminal S4 in the station 3. It can be seen that the extension of the network coverage is conveniently and effectively implemented by the system of the embodiment of the present invention.

It should be noted that, in the foregoing networking mode, in order to prevent interference to the reception of the link layer repeater 22, the link layer relay station 12 and the link layer relay station 32 may be configured to receive the link layer relay. After the signal is transmitted by the station 22, the transmission is prohibited, and only the Internet link is transmitted to the access layer relay station under the station. That is to say, when there is only one link layer relay station in a site, the link layer relay station in other stations adjacent to the station may be configured to prohibit transmission after receiving the transmission signal of the station. Thereby ensuring interference to the reception of the link layer relay station in the station.

It can be seen that the inter-site wireless interconnection system in the embodiment of the present invention sets a link layer relay station connected to the access layer relay station through the Internet link in the station, and uses the link layer relay station to realize wireless interconnection between the stations, so Additional hardware conversion equipment and overhead are required, and the networking is flexible and extensible. Since each relay station uses a single frequency and different time slots to transmit and receive signals, it can effectively save frequency points and duplexers, reduce the probability of frequency conflicts, and improve the stability of the system. and, With proper configuration, interference between adjacent sites can be avoided.

In the networking mode shown in Figure 2 above, only one link layer repeater is set in the site, and the connection between the sites can be regarded as a wireless cascade. It should be noted that the wireless interconnection system of the present invention is not limited to the foregoing networking mode. In other embodiments of the present invention, multiple link layer relay stations may be set at one site to implement more flexible networking and improvement. Signal transmission distance.

Example 3

As shown in FIG. 3, it is another networking diagram of the inter-site wireless interconnection system according to the embodiment of the present invention. In this embodiment, the system includes three sites, Site 1, Site 2, and Site 3. As shown in FIG. 3, the difference from the above-mentioned FIG. 2 is that, in this embodiment, the station 1 includes: an access layer repeating station 11 and two link layer repeating stations, respectively: a link layer repeating station 12 And the link layer relay station 13. Moreover, the link layer relay station 12 uses the same frequency as the link layer relay station 22 of the station 2, and the link layer relay station 13 and the link layer relay station 32 of the station 3 use the same frequency.

Take the networking mode shown in Figure 3 as an example to describe the process of wireless interconnection between terminals in different sites.

When the terminal S1 calls the terminal S2, the terminal S1 initiates a call; the access layer transit station of the station 1

11 After receiving the call, the call is converted into a signal, such as analog-to-digital conversion, encapsulated into an IP data packet, etc., and then transmitted to the link layer relay station 12 through the Internet link; the link layer relay station 12 will receive The received IP data packet is decapsulated, digital-to-analog converted, etc., and transmitted; after receiving the transmission signal, the link layer relay station 22 of the station 2 transits through the Internet link and the access layer relay station, and finally receives the terminal S2. The call, the call from the terminal S 1 to the terminal S2 is implemented.

When the terminal S1 calls the terminal S3, the terminal S1 initiates a call; after receiving the call, the access layer relay station 11 of the station 1 performs signal conversion, such as analog-to-digital conversion, encapsulation into an IP data packet, and the like, and then passes the process. The Internet link is transmitted to the link layer relay station 13; the link layer relay station 13 performs decapsulation, digital-to-analog conversion, etc. processing on the received IP data packet; the link layer relay station 32 of the station 3 receives After transmitting the signal, the terminal transits through the Internet link and the access layer, and finally the terminal S3 receives the call, and realizes the call from the terminal S1 to the terminal S3.

With the above networking mode, multiple link layer relay stations can be configured for the sites in the central area, and each link layer relay station can wirelessly connect one site, thereby expanding the network coverage. In this networking mode, it is theoretically possible to add an unlimited number of link layer repeaters, and Multiple link layer repeaters are set up in multiple sites to connect multiple sites to meet the network requirements of any coverage.

It should be noted that, in practical applications, the networking modes shown in FIG. 2 and FIG. 3 can be used as two basic system topology structures, and new sites are added on the basis of the existing network to implement multiple existing systems. There is wireless interconnection between networks. Of course, it is also possible to flexibly expand based on the above two basic system topologies to meet different networking and coverage requirements.

It should be noted that the prohibition of transmission and reception mentioned in the above embodiments means that the transmission and reception of the wireless mode are prohibited.

In addition, as mentioned above, in the prior art, since the synchronization reference signals of each repeater are relatively independent, synchronization between the repeaters cannot be realized, and direct interconnection between the repeaters cannot be realized. In the wireless interconnection system of the present invention, a synchronization mechanism is added to each repeater, and the signal receiver synchronizes to the signal transmitter, that is, the receiver transmits the synchronization direction, and the transmitter provides the synchronization reference signal to realize direct mutual interaction between the relay stations. even.

Synchronization between the terminal and the relay station: When the terminal initiates a call, the access layer relay station needs to synchronize to the synchronization reference of the terminal. When the access layer relay station sends a signal to the terminal, the terminal needs to synchronize to access. On the synchronization base of the layer transfer station.

Synchronization between the repeater and the repeater: For the repeater under the same site, share their own GPS (Global Positioning System, Global Positioning System) time or share the hardware timing through the hardware connection to adjust the working sequence. Synchronizing to the same reference, and the provider of the reference is the access layer relay station receiving the uplink signal in the station or the link layer relay station receiving the signal from the other station, and the link for the different stations The layer repeater also adopts the principle of receiving the transmitter in the receiving direction. As shown in FIG. 4, it is a schematic diagram of the timing synchronization of the repeater in the embodiment of the present invention.

Among them, the slash box indicates the emission timing, the back slash box indicates the reception timing, and the gray box indicates the invalid timing.

When the terminal S1 of the station 1 initiates a call, the access layer repeater A of the station 1 receives the uplink signal from the terminal, and adjusts the working timing according to the synchronization information of the received uplink signal, waiting for a transmission sequence, and then Transfer the currently received signal out at a transmission timing, The access layer relay station A transmits the received uplink signal to the link layer relay station A of the station 1 through the Internet link, and the access layer relay station A of the station 1 and the link layer relay station A share through the Internet link. The GPS time, or the way of sharing the working timing through the hardware connection, is synchronized, so the link layer relay station A and the access layer relay station A simultaneously transmit the uplink signals.

After receiving the signal from the link layer relay station A of the station 1, the link layer relay station B of the station 2 adjusts its own working sequence according to the synchronization information of the air interface signal, and waits for one transmission timing, and then receives the current transmission timing. The signal is transferred out.

The link layer repeater C of the station 3 receives the signal sent from the link layer transfer station B of the station 2 through the air interface, and transfers the link to the access layer transfer station C of the station 3 through the Internet link, and simultaneously through the Internet link or The hardware connection is synchronized, waiting for one transmission timing, and then transferring out at the next transmission timing.

The terminal S2 receives the access layer downlink signal from the station 3, and adjusts its own working sequence according to the synchronization information of the downlink signal.

In practical applications, the two repeaters that transmit and receive are in the same frequency and different time slots. In order to further save the frequency, all the repeaters of the same station can be synchronously transmitted or received, as shown in FIG. 5, so that the repeaters can share the same transmit antenna and the same receive antenna, only in the station. Separating a splitter and a synthesizer respectively connected to the access layer relay station and the link layer relay station in the station, wherein the splitter is configured to separate the signal received by the receiving antenna, and send the separated signal to Corresponding access layer relay station and link layer relay station; the synthesizer is used to correspondingly the station, and the embodiment of the invention further provides a method for inter-site wireless interconnection, which can be applied to various types described above. System networking mode.

As shown in FIG. 6, it is a flowchart of the method. In this embodiment, the station includes: an access layer relay station and a link layer relay station connected by an internet link, and each relay station adopts the same The frequency but different time slots work to transmit and receive signals. The method includes the following steps:

Step 601: Perform terminal access by using an access layer relay station in the site.

Specifically, on the one hand, after receiving the transmission signal of the terminal, the access layer relay station forwards the transmission signal of the terminal to the link layer relay station; on the other hand, the access layer relay station receives After the signal forwarded by the link layer relay station, the signal forwarded by the link layer relay station is sent To the terminal.

In different networking modes, the access layer repeating station forwards the transmitting signal of the terminal to the link layer relay station, which may include different situations, including:

If there is a link layer repeater at the same site as the access layer repeater, the access layer repeater transmits the transmit signal of the terminal to the link layer of the same site through the Internet link. a station, so that the link layer relay station of the same station sends the transmission signal of the terminal to the adjacent station;

If there is no link layer repeater located at the same site as the access layer repeater, the access layer repeater transmits the transmit signal of the terminal to the neighboring station wirelessly.

For example, the access layer relay station and the link layer relay station are located at the same site, and the access layer relay station receives the signal forwarded by the link layer relay station through the Internet link; the access layer The intermediate station and the link layer relay station are located at different sites, and the access layer relay station wirelessly receives the signal forwarded by the link layer relay station.

Step 602: Perform wireless interconnection between the stations through the link layer relay station in the station; the link layer relay station and the access layer relay station in the same station are connected by using an Internet link.

Specifically, after receiving the transmission signal of the neighboring station, the link layer relay station forwards the transmission signal of the neighboring station to the access layer of the same site of the link layer relay station through the Internet link. After receiving the signal forwarded by the access layer relay station of the same site of the link layer relay station through the Internet link, the link layer relay station transmits the signal forwarded by the access layer relay station to the station Said adjacent sites.

Of course, the method for inter-station wireless interconnection in the embodiment of the present invention is not limited to the above-mentioned signal transmission and transit process. Depending on the actual networking, different implementation processes may be used. For details, refer to the description in the previous embodiments. No longer.

It should be noted that, in the method of the embodiment of the present invention, the working frequency of the access layer repeating station of the adjacent station is different; the working frequency of the link layer repeating station of the adjacent station is the same; the access layer repeating station within the same station It works differently than the link layer repeater. Moreover, there may be multiple link layer repeaters in the same site, and the plurality of link layer repeaters operate at different frequencies.

In addition, in order to prevent interference between adjacent stations, in the method of the present invention, if the station has only one adjacent station, the link layer relay station in the station receives the transmission letter of the station. After the number, the transmission is prohibited; when the signal is transmitted wirelessly, reception is prohibited.

In the embodiment of the present invention, a inter-site wireless interconnection method is provided, in which a link layer relay station connected to an access layer relay station through an Internet link is set in the station. Since the link layer relay station is used to realize the wireless interconnection between the stations, no additional hardware conversion equipment and overhead are required, and the networking is flexible and extensible. Since each repeater uses a single frequency and different time slots to transmit and receive signals, it can effectively save frequency points and duplexers, reduce the probability of frequency conflicts, and improve the stability of the system. Moreover, the terminal does not need to activate the access layer repeater to achieve a faster access system.

Correspondingly, an embodiment of the present invention further provides a site, as shown in FIG. 7, which is a schematic structural diagram of the site 700.

In this embodiment, the station includes: an access layer relay station 701 and a link layer relay station 702 connected through an internet link; the access layer relay station 701 is configured to perform system access by the terminal; The road layer relay station 702 is used for wireless interconnection between stations; each of the relay stations uses a working mode of transmitting and receiving the same frequency but different time slots to transmit and receive signals.

In an actual application, the access layer repeater 701 and the link layer repeater 702 can perform synchronous transmission or reception.

In addition, the access layer repeater 701 and the link layer repeater 702 can share a receiving antenna and a transmitting antenna, and the station 700 further includes: a splitter and a synthesizer (not shown). among them:

The splitter is connected to the access layer relay station 701 and the link layer relay station 702, respectively, for separating signals received by the receiving antenna, and transmitting the separated signals to the corresponding access layer relay station and Link layer relay station;

The synthesizer is connected to the access layer relay station 701 and the link layer relay station 702, respectively, by using: ― ' ― "

When the interconnection between different sites is implemented, the operating frequencies of the access layer relay station 701 and the link layer relay station 702 are different. The examples focus on the differences from the other embodiments. In particular, for the device and system embodiments, since they are basically similar to the method embodiments, they are described in a relatively simple manner. A partial description of the method embodiment is sufficient. The apparatus and system embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, ie It can be located in one place, or it can be distributed to multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment. Moreover, the above transmitting device and receiving device can be integrated on one physical device to provide corresponding transmitting and receiving functions. Those of ordinary skill in the art can understand and implement without any creative effort. In addition, the devices in the above embodiments may be handheld terminal devices such as handheld walkie-talkies, and may also be other similar communication devices such as a radio station.

The above disclosure is only a preferred embodiment of the present invention, but the present invention is not limited thereto, and any modifications and refinements made by those skilled in the art can be made without departing from the principles of the present invention. All should fall within the scope of protection of the present invention.

Claims

Rights request

1. A wireless interconnection system between sites, characterized in that it includes: multiple sites; at least one site includes: an access layer repeater and a link layer repeater connected through an Internet link; other sites include at least: Access layer repeater; The access layer repeater is used for terminals to access the system; The link layer repeater is used for wireless interconnection between sites; Each repeater uses the same frequency but different time slots to transmit and receive. Send and receive messages

2. The system according to claim 1, characterized in that the access layer repeater and the link layer repeater at the same site perform synchronous transmission or reception.

3. The system of claim 2, characterized in that,

The access layer repeater and the link layer repeater in the same site share a receiving antenna and a transmitting antenna, and the same site also includes:

A splitter, respectively connected to the access layer repeater and the link layer repeater in the site, is used to separate the signal received by the receiving antenna, and send the separated signal to the corresponding access layer repeater and Link layer repeater;

A combiner, respectively connected to the access layer repeater and the link layer repeater, for combining the station

4. The system according to any one of claims 1 to 3, characterized in that: the access layer repeaters of adjacent sites have different operating frequencies; the link layer repeaters of adjacent sites have the same operating frequency; the same site The access layer repeater and the link layer repeater within the network have different operating frequencies.

5. The system according to any one of claims 1 to 3, characterized in that there are multiple link layer repeaters in the same site, and the operating frequencies of the multiple link layer repeaters are different.

6. The system according to any one of claims 1 to 3, characterized in that,

In the case where the site has only one adjacent site, the link layer relay station within the site is configured to prohibit transmission after receiving the transmission signal of the site; when transmitting the signal through wireless means, prohibit reception .

7. A method of wireless interconnection between sites, characterized in that the sites include: through the Internet The access layer repeater and the link layer repeater connected by the link; each repeater uses the same frequency but different time slots to send and receive signals;

The methods include:

Terminal access is performed through the access layer repeater in the site;

Wireless interconnection between sites is carried out through the link layer repeater in the site; the link layer repeater and the access layer repeater in the same site are connected through Internet links.

8. The method of claim 7, wherein the terminal access through an access layer relay in the site includes:

After receiving the transmission signal from the terminal, the access layer relay station forwards the transmission signal from the terminal to the link layer relay station;

After receiving the signal forwarded by the link layer repeater, the access layer repeater sends the signal forwarded by the link layer repeater to the terminal.

9. The method according to claim 8, wherein the access layer relay station forwarding the transmission signal of the terminal to the link layer relay station includes:

If there is a link layer relay station located at the same site as the access layer relay station, the access layer relay station transmits the transmission signal of the terminal to the link layer relay station at the same site through the Internet link. station, so that the link layer relay station of the same site sends the transmission signal of the terminal to the adjacent site;

If there is no link layer relay station located at the same site as the access layer relay station, the access layer relay station wirelessly transmits the transmission signal of the terminal to the adjacent site.

10. The method of claim 8, wherein the method further includes: if the access layer repeater and the link layer repeater are located at the same site, then the access layer repeater communicates via the Internet The link receives the signal forwarded by the link layer repeater; or

If the access layer relay station and the link layer relay station are located at different sites, then the access layer relay station wirelessly receives the signal forwarded by the link layer relay station.

11. The method of claim 7, wherein the wireless interconnection between sites through a link layer repeater within the site includes:

After receiving the transmission signal from the adjacent site, the link layer relay station forwards the transmission signal from the adjacent site to the access layer relay at the same site as the link layer relay station through the Internet link. Station - After the link layer repeater station receives the signal forwarded by the access layer repeater station at the same site as the link layer repeater station through the Internet link, it sends the signal forwarded by the access layer repeater station to the Describe adjacent sites.

12. The method according to any one of claims 7 to 11, characterized in that: the access layer repeaters of adjacent sites have different operating frequencies; the link layer repeaters of adjacent sites have the same operating frequency; the same site The access layer repeater and the link layer repeater within the network have different operating frequencies.

13. The method according to any one of claims 7 to 11, characterized in that there are multiple link layer repeaters in the same site, and the operating frequencies of the multiple link layer repeaters are different.

14. The method according to any one of claims 7 to 11, characterized in that,

If the site has only one neighboring site, the link layer repeater within the site is prohibited from transmitting after receiving the transmission signal from the site; when transmitting the signal wirelessly, reception is prohibited.

15. A site, characterized in that it includes: an access layer repeater and a link layer repeater connected through an Internet link; the access layer repeater is used for terminals to access the system; the link layer Repeaters are used for wireless interconnection between sites; each repeater uses the same frequency but different time slots to send and receive signals.

16. The site according to claim 15, wherein the access layer repeater and the link layer repeater perform synchronous transmission or reception.

17. The site according to claim 16, characterized in that,

The access layer repeater and the link layer repeater share a receiving antenna and a transmitting antenna, and the site also includes:

A splitter, respectively connected to the access layer repeater and the link layer repeater, used to separate the signal received by the receiving antenna, and send the divided signal to the corresponding access layer repeater and link Layer transfer station;

18. The site according to any one of claims 15 to 17, characterized in that the access layer repeater and the link layer repeater have different operating frequencies.