WO2013063939A1

WO2013063939A1 - Method and system for suppressing out-of-band leakage interference

Info

Publication number: WO2013063939A1
Application number: PCT/CN2012/076859
Authority: WO
Inventors: 刁心玺; 曹一卿; 马志锋
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-11-04
Filing date: 2012-06-13
Publication date: 2013-05-10
Also published as: JP5855758B2; JP2015501607A; CN103096326A; CN103096326B

Abstract

Disclosed are a method and system for suppressing out-of-band leakage interference, for solving the technical problem that the existing usage method of the guard band cannot reduce the guard bandwidth among specific systems. In the present invention, a low-medium-power terrestrial television broadcast transmission channel is used to share site addresses with a terrestrial mobile communication system, avoiding the occurrence of out-of-band leakage power of the conventional large-power terrestrial broadcast transmitter, thus greatly reducing the width of the guard band between the terrestrial television broadcast band and the terrestrial mobile communication system; at a shared site address, a part of bands allocated for use by the mobile communication uplink channel are used as the isolation bands between the low-medium-power terrestrial television broadcast transmission channel and the terrestrial mobile communication system at the shared site address, reducing the interference to the mobile communication uplink channel by the out-of-band leakage power of the terrestrial television broadcast transmission channel.

Description

Method and system for suppressing out-of-band leakage interference

The present invention relates to the field of wireless communications, and in particular, to a method and system for suppressing out-of-band leakage interference. Background technique

In general, terrestrial television broadcasting uses large-area coverage with transmitters with RF powers ranging from several kilowatts to hundreds of kilowatts. Such high-power transmitters generate strong out-of-band leakage power, and strong out-of-band leakage power will be deployed in adjacent or adjacent frequency bands. The receiving channel of the mobile communication base station or mobile terminal generates strong interference and even blocks the base station or the receiver of the mobile terminal. At present, some actual test studies have been completed for the intensity and distribution of such interference. The test shows: When the power of the terrestrial TV transmitter is several hundred kilowatt-hours, the out-of-band leakage power of the television transmitter is within 10 km from the television transmitter. (OOB, out of band emission) In the range of -30dBm ~ -60dBm, this power greatly exceeds -90dBm ~ -70dBm required by the mobile communication network planning.

The out-of-band leakage power of the terrestrial television broadcast transmitter is received by the base station when the terrestrial television broadcast transmitter and the time division duplex mobile communication base station are adjacent to each other, or when operating adjacent to the uplink channel of the FDD system The machine generates serious interference, which reduces the uplink capacity of the system, reduces the uplink coverage, and even blocks the upstream receiving channel.

The traditional method of suppressing the adjacent channel interference of the transmitter to the receiver is to configure a fixed guard band between the transmitter and the receiver on the adjacent frequency. For example, a guard band with a bandwidth of 5 MHz is configured. The determination of this method is protection. The introduction of the band reduces the efficiency of spectrum use, especially in the uplink interference of terrestrial TV broadcasting transmitters to terrestrial mobile communication system base stations on adjacent or adjacent frequency bands, because the high-power or super-power transmitters used in terrestrial television broadcasting are very strong. Out-of-band leakage power, in order to suppress the interference of this out-of-band leakage power, it is necessary to move on the TV transmission channel and land. A guard band that is much larger than the 5 MHz bandwidth is introduced between the communication receiving channels, which causes a further reduction in spectrum usage.

The patent application number is CN200910076542.6, and the invention name is "a method and device for using a guard band". The following four spectrum usage methods are announced:

(1) The first base station in the TDD system allocates the first frequency resource in the uplink protection band to the first user equipment and delivers resource scheduling information, where the uplink protection band is a guard band between the FDD uplink frequency band and the TDD frequency band. The first base station receives, by the first user equipment, the uplink data that is sent in the uplink time unit on the first frequency resource according to the resource scheduling information; the first base station carries the downlink data in the downlink time unit on the second frequency resource and sends the downlink data to the downlink time unit. a first user equipment, where the second frequency resource includes a frequency resource in a downlink guard band and/or a frequency resource in a TDD band;

(2) The first base station in the TDD system transmits the second frequency resource in the downlink protection band to the first user equipment, where the downlink protection band is a guard band between the TDD band and the FDD downlink band; Uplink data transmitted in an uplink time unit is carried on the first frequency resource; the first frequency resource includes a frequency resource in an uplink guard band and/or a frequency resource in a TDD band;

(3) The first base station in the TDD system allocates the first frequency resource in the uplink protection band to the first user equipment and delivers the resource scheduling information; the first base station receives the first frequency resource in the first frequency resource according to the resource scheduling information. The uplink data carried in the uplink time unit is carried by the first base station, and the first base station transmits the downlink data in the downlink time unit to the first user equipment, where the second frequency resource includes the frequency in the downlink protection frequency band. Downstream frequency resources in resources and/or FDD bands;

(4) The terminal in the FDD system receives data on a guard band between the FDD downlink frequency band and the TDD frequency band as the second frequency resource; the terminal transmits data to the base station on the first frequency resource, the first frequency resource Including frequency resources in the uplink guard band and/or in the FDD band Uplink frequency resource;

The existing method of utilizing the guard band is to further utilize this determined bandwidth without reducing the width of the guard band under a certain bandwidth.

The disadvantage of the patent application number CN200910076542.6 is that the protection band having a specific frequency band width existing between specific systems can be further utilized, and the protection bandwidth between the specific systems cannot be reduced. Summary of the invention

In view of the above, it is a primary object of the present invention to provide a method and system for suppressing out-of-band leakage interference, which can significantly reduce the guard band width between a terrestrial television broadcasting system and a land mobile communication system, and improve spectrum utilization efficiency.

In order to achieve the above object, the technical solution of the present invention is achieved as follows:

The invention provides a method for suppressing out-of-band leakage interference, the method comprising:

Deploying, in a first sub-band covered by the second frequency band, a first transmit channel transmitted at medium power and/or low power on a first sub-band included in the first frequency band, the first sub-band being similar to the second frequency band Or adjacent, the first frequency band belongs to a planned frequency band of a terrestrial television broadcasting system, and the second frequency band belongs to a planned frequency band of a land mobile communication system;

Determining, in the first geographic area, a set of addresses from a site used by the land mobile communication base station as a shared site of the terrestrial television broadcast transmitting antenna and the land mobile communication base station antenna;

Configuring, at the shared site, a first transmit channel on the first sub-band, and a first receive channel on a second sub-band of the second band, the first sub-band and the There is a third sub-band belonging to the second frequency band between the second sub-bands, and the third sub-band is used to suppress interference of the first transmission channel out-of-band leakage power to the first receiving channel at the shared site.

In the above solution, the third sub-band is adjacent to the second sub-band, and the third sub-band is a frequency band used by the second uplink receiving channel at the non-shared site, and the second uplink receiving The channel is a channel for the land mobile communication base station to receive the signal sent by the terminal on the third sub-band. In the above solution, the second sub-band and the third sub-band are planned for frequency division multiplexing.

The upstream band used by the FDD system is either the band planned for the time division multiplexed TDD system.

In the above solution, the method further includes: at the shared site, the first transmit channel transmits on the first sub-band using a first transmit antenna, and the first receive channel uses a first receive antenna Receiving on the second sub-band;

When the distance between the shared site and the non-shared site where the second uplink receiving channel is deployed is less than a preset threshold, the first transmit antenna on the shared site and the first on the shared site The receiving antenna is a split-arranged antenna. In the main beam coverage of the first transmitting antenna, there is no relative distance from the shared site where the first transmitting antenna is located is less than a preset threshold, and in the third sub-band. A non-shared site configured with a second uplink receiving channel.

In the above solution, the method further includes: transmitting, in the first geographical area, a terrestrial television broadcast signal on the first sub-band by using a first transmit channel configured at a group of shared sites to transmit the same frequency;

In the above solution, the method further includes: using the first sub-band in a combination of one or more of the following manners:

Coordinating the spectrum resources of the first sub-band between adjacent shared sites, and using the first sub-band for downlink transmission in different cells in a time division manner between cells covered by a group of adjacent shared sites;

Coordinating the spectrum resources of the first sub-band between adjacent shared sites, and using the first sub-band in a soft frequency multiplexing manner between the cells covered by a group of adjacent sites for downlink in different cells Transmission

Performing carrier aggregation transmission in the first sub-band and the downlink frequency band included in the second frequency band; transmitting service data to the terminal in a point-to-point manner on the first sub-band, and transmitting feedback data of the service data to the network side on the second sub-band Or control the data.

In the above solution, the first transmitting channel configured on the first sub-band is as follows A transmitting signal:

(1) transmitting a signal to the mobile communication receiver using the second carrier and the mobile communication wireless technology specification while transmitting the television broadcast signal to the television receiver using the first carrier and the television broadcast wireless technology specification on the first sub-band;

(2) transmitting a television broadcast signal to the television receiver using the television broadcast wireless technology specification in the first time interval in the first sub-band, and transmitting the signal to the mobile communication receiver using the mobile communication wireless technology specification in the second time interval, The first time interval and the second time interval range from a few minutes or hours.

In the above solution, the method further includes: monitoring the terrestrial television broadcast signal in the first sub-band, specifically:

At least one television broadcast channel monitoring device is deployed within a geographic area covered by the first transmit antenna, the monitoring device receiving a signal transmitted by the first transmit channel on the first frequency band.

Deploying at least one television broadcast channel monitoring device in a geographical area covered by the first transmit antenna, the monitoring device receiving the signal transmitted by the first transmit channel in the first frequency band, and acquiring the first frequency band through the wired transmission channel The broadcast broadcast code to be tested, comparing the signals received from the wireless channel and the wired channel to determine the transmission quality of the signal received from the first frequency band; or

Deploying at least one television broadcast channel monitoring device in a geographic area covered by the first transmit antenna, the monitoring device receiving a television broadcast signal or a measurement signal transmitted by the first transmit channel on the first frequency band, for the television broadcast signal Or measuring the signal for measurement, and reporting the measurement result to the network side;

The measured parameters include at least one of the following:

1) the power at which the signal arrives at the monitoring device; 2) an arrival time of the signal transmitted by the first transmission channel at different station locations to the monitoring device, and a broadcast code stream to be tested on the first frequency band acquired through the wired transmission channel;

3) The bit error rate at the time of signal reception at the monitoring device.

Based on the method for suppressing out-of-band leakage interference provided by the present invention, the present invention also provides a system for suppressing out-of-band leakage interference, wherein the system is used from a land mobile communication base station in a first geographical area covered by the second frequency band. Defining a group of sites in the site as a shared site for terrestrial television broadcasting and land mobile communication networks;

The system also includes at least one first transmit channel disposed on the first sub-band, a first receive channel deployed on the second sub-band; wherein the first transmit channel transmits television at medium power and/or low power a broadcast signal, the first sub-band is adjacent to or adjacent to the second frequency band, and the third sub-band belonging to the second frequency band exists between the first sub-band and the second sub-band, and the third sub-band is used The interference of the out-of-band leakage power of the first transmitting channel to the first receiving channel is suppressed at the shared site.

In the above solution, the second sub-band and the third sub-band in the system are uplink bands used for planning the frequency division multiplexing FDD system or bands used for planning the time division multiplexing TDD system.

In the above solution, in the system, at the shared site, the first transmitting channel transmits on the first sub-band using a first transmit antenna, and the first receive channel uses a first receive antenna Receiving on the second sub-band;

When the distance between the shared site and the non-shared site where the second uplink receiving channel is deployed is less than a preset threshold, the first transmit antenna on the shared site and the first on the shared site The receiving antenna is a split-arranged antenna. In the main beam coverage of the first transmitting antenna, there is no relative distance from the shared site where the first transmitting antenna is located is less than a preset threshold, and in the third sub-band. a non-shared site configured with a second uplink receiving channel; the second uplink receiving channel is a channel for the land mobile communication base station to receive a signal sent by the terminal on the third sub-band. In the above solution, in the system, the first transmitting channel transmits a signal in one of the following manners:

The present invention further provides a method for suppressing out-of-band interference of a transmit channel to a receive channel, which is based on the method for suppressing out-of-band leakage interference provided by the present invention, for suppressing out-of-band leakage of an uplink transmit channel of a terminal, according to an embodiment of the present invention. The power is especially for the TV broadcast receiving channel in the same terminal, and the method includes:

The terminal performs television broadcast signal reception on one or more time slots on the television broadcast radio frame, and reports the slot position or slot number information for receiving the television broadcast signal to the network side; the terminal does not perform television broadcast. Transmitting a signal to the network side in a time interval in which the signal is received, or the network side transmits a signal to the network side in a time interval in which the television broadcast signal is not received according to the time slot information received by the terminal for performing the television broadcast signal reception; or

The terminal performs television broadcast signal reception on one or more time slots on the television broadcast radio frame, and the terminal sends an uplink signal to the network side while receiving the television broadcast signal; the uplink signal is sent in a short data packet manner. The transmission time interval (ΤΤΙ, Tramsmission Time Interval) used to transmit data in a short packet manner is smaller than the fading time length that the television broadcast channel can withstand.

A terminal is further provided in the system for suppressing out-of-band leakage interference provided by the present invention, where the terminal includes a receiving module and a transmitting module; a receiving module, configured to perform television broadcast signal reception on one or more time slots included in a television broadcast radio frame transmitted in the first sub-band;

a sending module, configured to report the slot position or slot number information for receiving the television broadcast signal to the network side, and send a signal to the network side in a time interval in which the television broadcast signal is not received, or according to the network side control Sending a signal to the network side within a time interval in which no television broadcast signal is received; or

a sending module, configured to send an uplink signal to the network side while receiving the television broadcast signal; the uplink signal is sent in a short data packet manner, where the data used in the short data packet manner is smaller than the television broadcast channel can bear The length of the fading time.

The present invention avoids the generation of out-of-band leakage power of a conventional high-power ultra-high-power terrestrial television broadcast transmitter by using a medium-low-power terrestrial television broadcast transmission channel and a land mobile communication system sharing site; At the site, a part of the frequency band (the third sub-band described in the present invention) used for planning the mobile communication uplink channel is used as the medium-low power terrestrial television broadcast transmission channel and the uplink channel between the land mobile communication system at the shared site. The isolation frequency band further reduces the interference of the out-of-band leakage power of the medium-low power transmission terrestrial television broadcasting transmission channel to the uplink channel of the land mobile communication, and the part of the frequency band used for the uplink mobile channel of the land mobile communication is planned as the isolation band. Can be used by sites outside the shared site or by sites of other operators;

Through the above measures, the out-of-band leakage caused by the transmission power of the conventional super-powered terrestrial television broadcast transmitter is significantly reduced, thereby significantly reducing the guard band width between the terrestrial television broadcasting system and the land mobile communication system, and improving the spectrum use efficiency. Replacing very large power transmitters with low-power distributed terrestrial broadcast transmitters can also avoid stringent requirements for transmitter out-of-band leakage specifications and ease the cost of transmitters. DRAWINGS

1 is a flow chart of a method for suppressing out-of-band leakage interference provided by the present invention; 2 is a schematic diagram of a configuration manner of a broadcast channel and a mobile communication uplink channel at a shared site; FIG. 3 is a schematic structural diagram of a terminal provided by the present invention;

FIG. 4 is an example of a configuration manner of a broadcast channel and a mobile communication uplink channel. detailed description

The basic idea of the present invention is: to reduce the out-of-band leakage caused by the transmission power of the traditional super-powered terrestrial television broadcast transmitter by adjusting the networking mode of the terrestrial television broadcasting system and the channel configuration mode of the base station of the land mobile communication system, thereby reducing The width of the guard band between the terrestrial television broadcasting band and the land mobile communication system increases the efficiency of spectrum use.

The terms used in the present invention are explained below:

(1) First frequency band: refers to the planned frequency band belonging to the terrestrial television broadcasting system;

(2) Second frequency band: Refers to the planned frequency band belonging to the land mobile communication system. The second frequency band includes an uplink frequency band of the FDD or a frequency band used in the TDD mode;

(3) The first sub-band: refers to a sub-band included in the first frequency band adjacent to or close to the second frequency band, and the first transmission channel is disposed on the first sub-band, and the first transmission channel covers at least one terrestrial television broadcast channel ;

(4) The second sub-band: refers to a sub-band included in the second frequency band, which is a frequency band of the uplink channel of the terrestrial mobile communication system included in the second frequency band;

(5) The third sub-band: the third sub-band is adjacent to the second sub-band, and is the frequency band of the uplink channel of the terrestrial mobile communication system included in the second frequency band; the second frequency band includes the uplink frequency band of the FDD or includes the TDD mode Frequency band used;

(6) The isolated frequency band between the planned terrestrial television broadcasting system and the land mobile communication system: is included in the second frequency band, between the first frequency band and the third sub-band, according to the spectrum management rule, the frequency band is used as the suppression a planned frequency band of interference between a frequency band and a second frequency band;

(7) shared site: a shared site of the terrestrial television broadcasting system and the land mobile communication system, that is, the terrestrial television broadcasting downlink channel is deployed on the first frequency band at the same site and is in the second The site of the uplink channel of the land mobile communication system is deployed in the frequency band;

(8) Co-location deployment isolation band: A frequency band located between the first frequency band and the second frequency band, the frequency band including the third sub-band. The co-site deployment isolation band is one of the following: 1) is a band containing only the third sub-band; 2) is an isolation band between the terrestrial television broadcasting system and the land mobile communication system including the third sub-band and the plan.

(9) a third sub-band: an adjacent frequency band of the second frequency band, the base station at the non-shared site configures an uplink channel on the third sub-band, and deploys one sub-band included in the isolated frequency band for the co-station;

(10) The first geographical area refers to the area in which the land mobile communication network implements coverage using the second sub-band or/and the third sub-band.

The invention adjusts the networking mode of the terrestrial television broadcasting system and adjusts the channel configuration mode of the terrestrial mobile communication system base station, including the following three aspects:

1) Implementing a single-frequency networking in a distributed deployment of low-power transmitters in the terrestrial television broadcasting frequency band;

2) deploying a medium and low power TV broadcast transmitter and a land mobile communication system;

3) setting an isolation band between the uplink channel of the base station of the land mobile communication system and the medium and low power terrestrial television broadcasting transmitter deployed by the co-station to reduce the out-of-band leakage interference of the terrestrial television broadcast channel to the uplink channel of the land mobile communication base station, thereby reducing The bandwidth of the isolated frequency band between the terrestrial television broadcast channel and the uplink channel of the land mobile communication base station;

Further, by using a spatial multiplexing method, a frequency band that is planned to be used in the isolated frequency band for the land mobile communication system for the uplink channel of the base station is configured on a site where the low-power terrestrial television transmitter is not configured, Effective use of the upstream spectrum planned for mobile communications.

The invention solves the problem that after the terrestrial television broadcast coverage mode using high-power centralized transmission is changed to the terrestrial television broadcast coverage mode using a set of medium power or low power transmitters for distributed transmission, the problem is: Question 1: How to economy Achieving the deployment of numerous medium power or low power transmitters, including how to select sites for these medium or low power transmitters and how to build a transmission network for these medium or low power transmitters, a solution to this problem Is going to be The power or low power transmitter is deployed at a base station of the land mobile communication system, sharing the site with the land mobile communication system; or, further, sharing the transmission network. The further issues raised by the shared site are: Question 2: How to solve the interference of the terrestrial television broadcast transmitter deployed at the same site of the land mobile communication system to the receiving channel of the land mobile communication system base station, a method to solve this problem Yes: an isolation band is provided between the downlink channel of the terrestrial television broadcast transmitter and the reception channel of the terrestrial mobile communication system deployed by the co-station, the isolation band comprising a frequency band partially planned for use by the uplink channel of the land mobile communication system; further The antenna used by the downlink channel of the terrestrial television broadcast transmitter is spatially isolated from the antenna used by the receiving channel of the terrestrial mobile communication system deployed by the co-station.

The solution of the above problems 1 and 2 solves the interference of the out-of-band leakage of the downlink channel on the first frequency band to the base station reception channel on the second frequency band, but when the aforementioned shared site is configured on the third sub-band The second type of site of the upstream channel (the site where the first transmitting channel is not configured) is geographically adjacent or adjacent, and the following problems occur:

Problem 3: The out-of-band leakage power of the first transmit channel is strongly interfered with the upstream channel on the third sub-band configured on the second type of site.

The solution to the problem 3 is as follows: The bandwidth of the first transmission channel may include one or more terrestrial television broadcast channels, that is, when the broadcast channel is configured on the first sub-band, the same transmission channel (such as the same amplifier) may be used. Transmit one broadcast channel or multiple broadcast channels because one broadcast channel occupies 6~8M. One RF channel can achieve 20MHz bandwidth, so one amplifier can be used to transmit up to three broadcast channels. In order to further improve the isolation performance under the problem 3, the solution is: further take a part of the TV channel as a guard band; or, when deploying the antenna of the first transmission channel, use the directivity of the antenna, such as the front-to-back ratio characteristic. Spatial isolation, such as adjusting the direction of the transmit antenna of the first transmit channel deployed at the shared site and/or the location of the installation at the shared site, such that the uplink channel usage on the third sub-band on the second type of site is received The antenna is located at the main beam of the antenna used in the transmit channel Outside area;

FIG. 1 is a flowchart of a method for suppressing out-of-band leakage interference according to an embodiment of the present invention. The frequency band configuration based on the method may refer to FIG. 2, where the method includes:

Step S101: deploying, in a first sub-band included in the first frequency band, a first transmit channel that transmits at medium power and/or low power in a first geographic area that is covered by using the second frequency band; The frequency band belongs to a planned frequency band of the terrestrial television broadcasting system, and the second frequency band belongs to a planned frequency band of the land mobile communication system, and the first sub-band is adjacent or adjacent to the second frequency band; Step S102, in the first geographical area Determining a group of sites from a site used by the land mobile communication base station as a shared site of the terrestrial television broadcast transmitting antenna and the land mobile communication base station antenna;

Step S103, at the shared site, configuring a first transmit channel on the first sub-band, and configuring a first receive channel on a second sub-band in a terrestrial mobile communication band, where the first sub-band is There is a third sub-band belonging to the second frequency band between the second sub-band, the third sub-band is adjacent to the second sub-band, and the third sub-band is the second uplink receiving channel disposed at the non-shared site Frequency band used;

The second uplink receiving channel is a receiving channel of the base station deployed in the first uplink receiving channel, and the third sub-band occupied by the second uplink receiving channel is usually a frequency band used by another carrier. When the first transmit channel on the first sub-band is co-located with the first uplink receive channel, there is a third sub-band between the first transmit channel and the first uplink receive channel as an isolated band, therefore, The first transmit channel does not interfere with the second uplink receive channel of the co-site deployment. Further, the third sub-band is used by another operator and there is no wasted spectrum.

The third sub-band is configured to suppress interference of the first transmit channel out-of-band leakage power to the first receive channel at the shared site. The second sub-band and the third sub-band are uplink bands used for planning a frequency division multiplexing FDD system or bands used for planning a time division multiplexed TDD system; In order to advance step by step, suppress the first first shot of the shot-passing channel at the location of the shared shared station, and to the near-close distance of the deployment department. The non-co-shared station address of the station has an out-of-band interference interference, and the method described in the method further includes the following steps:

Dangdang between the shared shared station address and the non-shared shared station address of the second and second uplinks received and received the access channel When the distance between the distances is smaller than the pre-preset threshold value, the first first launch antenna antenna line on the station address is shared with the first type The first station receiving and receiving antenna antenna line on the station site is the antenna antenna line for the separation and deployment department, and According to the following original principle, the direction of the main main beam beam direction of the first transmitting antenna antenna line is configured: In the first first launch, the main antenna line is launched. The distance between the main beam beam cover and the coverage range does not exist in the range of the opposite distance from the co-shared station address of the first transmit antenna antenna line. The pre-preset threshold value is set and the second and second uplink lines are arranged on the third and third sub-frequency bands. Receiving the received Cn Feifei all share common addresses shared station site

Step by step, and deployed with the Department of Deployment of the Department of Deployment, which is located near the site of the first-infrared launch antenna line. The second and second uplink transmission lines of the non-co-shared sharing station address of the receiving and receiving channel are attached to the vicinity of the geographical area of the local area, and the electric television broadcast broadcasting broadcast signal signal coverage cover is covered by The other first it transmits a first shot of the launching channel at the site of the station. .

The method is based on the method for suppressing the leakage of the outer leakage leakage and the interference interference provided by the present invention, in order to be in the first geographical area The work of deploying the deployment department on the site of the shared shared station site is performed on the ground floor of the launcher machine in the first sub-subband frequency band. The TV broadcast and broadcast broadcast signal number is used for monitoring and testing. In order to understand the quality of the cover network, the invention will also provide a step by step. For the following two methods, the method for monitoring and measuring the ground-based electric television broadcast broadcast broadcast signal signal of the first sub-subband frequency band is as follows: ::

The method of the method 11. In the area of the geographic area of the first first launching antenna antenna cover cover, the department deploys at least one television broadcast wide broadcast broadcast channel The monitoring and measuring device of the road monitoring device is arranged to receive and transmit the first transmitting band of the first frequency band, and the transmitting and transmitting by the first transmitting channel At the same time of the signal signal number, the broadcast broadcast code stream to be tested on the first frequency band is obtained by passing the wire transmission channel. , the pair will be compared from the no-wire channel channel and the received signal signal received by the wired channel, and it is determined that the slave is from the first frequency band. Transmitting the quality of the transmitted transmission quality by receiving the received signal signal number;

The method of the method 22, in the region of the first geographic field of the first antenna, the antenna is deployed to cover the coverage area of the antenna, and the department deploys at least one television broadcast wide broadcast broadcast channel. The monitoring and measuring device of the road monitoring device is arranged to receive and transmit the first transmitting band of the first frequency band, and the transmitting and transmitting by the first transmitting channel The electric television broadcasts the broadcast broadcast signal signal number or the measured measurement signal signal signal number, and performs measurement measurement on the electric television broadcast wide broadcast broadcast signal signal number or the measured measurement quantity signal signal number. , will report the results of the measured measurement results to the side of the network;

* 1) the power at which the signal arrives at the monitoring device;

2) an arrival time of the signal transmitted by the first transmission channel at different station locations to the monitoring device, and a broadcast code stream to be tested on the first frequency band acquired through the wired transmission channel;

3) The bit error rate at the time of signal reception at the monitoring device.

The monitoring device reports the measurement result to the network side through the air interface or the wired transmission channel, and transmits it to the regulatory agency or operator of the first frequency band by the network side.

Further, in the first geographical area, in addition to transmitting the terrestrial television broadcast signal at the same frequency on the first sub-band using the first transmission channel configured at a group of shared sites, one of the following manners One or more combinations use the first sub-band:

1. Coordinating the spectrum resources of the first sub-band between adjacent shared sites, and using the first sub-band for downlink in different cells in a time division manner between cells covered by a group of adjacent shared sites Transmission

2. Coordinating the spectrum resources of the first sub-band between adjacent shared sites, and using the first sub-band in different cells in a soft frequency multiplexing manner between cells covered by a group of adjacent sites Downlink transmission

3. Perform carrier aggregation transmission in the first sub-band and the downlink frequency band included in the second frequency band, even if the carrier on the first sub-band and the downlink carrier included in the second frequency band simultaneously transmit data to the same terminal;

4. Sending service data to the terminal in a point-to-point manner on the first sub-band, and transmitting feedback data or control data of the service data to the network side on the second sub-band;

It should be further noted that: the first transmitting channel at the shared site transmits on the first sub-band using the first transmit antenna, and the first receive channel receives on the second sub-band using the first receive antenna, the first transmit antenna And the first receiving antenna is two discrete antennas deployed at the shared site or an antenna shared by the first transmitting channel and the first receiving channel;

Further, as shown in FIG. 2b, there is a guarantee between the first sub-band and the third sub-band. The guard band 204, which is the frequency band specified in the technical specifications.

In order to implement the above method, the present invention also provides a system for suppressing out-of-band leakage interference, in which a group of sites are determined from a site used by a land mobile communication base station in a first geographical area covered by the second frequency band. As a shared site of the terrestrial television broadcast and the land mobile communication network; the system includes at least one first transmit channel deployed on the first sub-band, and a first receive channel deployed on the second sub-band; a transmitting channel transmits a television broadcast signal at a medium power and/or a low power, the first sub-band is adjacent or adjacent to the second frequency band, and the first sub-band and the second sub-band are in a second frequency band a third sub-band for suppressing interference of the first transmit channel out-of-band leakage power to the first receive channel at the shared site.

The second sub-band and the third sub-band are uplink bands used for planning a frequency division multiplexed FDD system or bands used for planning a time division multiplexed TDD system.

At the shared site, the first transmit channel transmits on the first sub-band using a first transmit antenna, and the first receive channel performs on the second sub-band using a first receive antenna Receive

When the distance between the shared site and the non-shared site where the second uplink receiving channel is deployed is less than a preset threshold, the first transmit antenna on the shared site and the first on the shared site The receiving antenna is a split-arranged antenna. In the main beam coverage of the first transmitting antenna, there is no relative distance from the shared site where the first transmitting antenna is located is less than a preset threshold, and in the third sub-band. a non-shared site configured with a second uplink receiving channel; the second uplink receiving channel is a channel for the land mobile communication base station to receive a signal sent by the terminal on the third sub-band.

The first transmit channel transmits a signal in one of the following ways:

(1) transmitting a signal to the mobile communication receiver using the second carrier and the mobile communication wireless technology specification while transmitting the television broadcast signal to the television receiver using the first carrier and the television broadcast wireless technology specification on the first sub-band; (2) transmitting a television broadcast signal to the television receiver using the television broadcast wireless technology specification in the first time interval in the first sub-band, and transmitting the signal to the mobile communication receiver using the mobile communication wireless technology specification in the second time interval, The first time interval and the second time interval range from a few minutes or hours.

Based on the method for suppressing out-of-band leakage interference provided by the present invention, the present invention further provides a method for suppressing out-of-band interference of a transmission channel to a receiving channel by a terminal side, which is suitable for suppressing outband leakage power of an uplink transmission channel of a terminal to the same terminal. The television broadcast receives interference from the channel, and the method includes one of the following methods:

Method 1: The terminal performs television broadcast signal reception on one or more time slots on the television broadcast radio frame, and reports the slot position or the slot number information of the terminal for receiving the television broadcast signal to the network side;

The terminal sends a signal to the network side in a time interval in which the television broadcast signal is not received, or the network side transmits the time slot information of the television broadcast signal reported by the terminal, and the control terminal transmits the time to the network side in a time interval in which the television broadcast signal is not received. Signal

Method 2: The terminal receives on one or more time slots on the television broadcast radio frame, and the terminal sends an uplink signal to the network side while receiving the television broadcast signal signal; the characteristic is that the sent signal is a short data packet. In the manner, the ΤΉ used for transmitting data in a short data packet manner is smaller than the fading time length that the television broadcast channel can bear. In general, television broadcasts use interleaved coding to eliminate the effects of fading on signal reception. The fading time that can be resisted is related to the depth of interleaving and the speed of movement, usually on the order of a few milliseconds. a data block or a transport block sent by the terminal to the network side during the period of receiving the signal, the transmission time of the transport block or the data block being less than the anti-fading time or the impact interference time of the television broadcast channel, usually the transport block or the data block The transmission time is around one millisecond. The terminal described in the method sends a signal to the network side, using a channel adjacent or close to the television broadcast channel. Specifically, the terminal uses the second sub-band or the third sub-band described in the present invention. In order to implement the foregoing method for suppressing the out-of-band interference of the transmit channel to the receive channel, the present invention provides a terminal. As shown in FIG. 3, the terminal includes a receiving module 31 and a sending module 32. The receiving module 31 is configured to be used in the first The television broadcast signal is received on one or more time slots included in the television broadcast radio frame transmitted by the sub-band;

The sending module 32 is configured to report the slot position or slot number information for receiving the television broadcast signal to the network side, and send a signal to the network side in a time interval in which the television broadcast signal is not received, or according to the network side. Controlling the transmission of signals to the network side within a time interval in which no television broadcast signal is received; or

The sending module 32 is configured to send an uplink signal to the network side while receiving the television broadcast signal; the uplink signal is sent in a short data packet manner, and the data used in the short data packet manner is smaller than the television broadcast channel can bear The length of the fading time.

In the following, the frequency band of 698 ~ 806 MHz in the Asia Pacific region is divided into actual scenarios. Referring to FIG. 4, an implementation method for suppressing the interference of the outband leakage power of the terrestrial television broadcast channel to the uplink channel of the terrestrial mobile communication system on the adjacent frequency band is performed. Description.

As shown in Figure 4, on the left side of 698MHz, it is planned to use the spectrum for terrestrial TV broadcasting systems. In the Asia-Pacific region, different countries adopt different types of TV broadcasting. Some countries use broadcasting with a channel spacing of 8MHz. Channels, some use broadcast channel spacing with channel spacing of 7MHz or 6MHz, which results in different frequency spacing between the TV broadcast channel actually used in different countries and the frequency point 698MHz. The first sub-band 201 of the present invention, as shown in FIG. 4, has a different frequency interval between the center frequency of the broadcast channel actually included and the 698 MHz frequency point; in addition, the first sub-band 201 may include one or more The television broadcast channels, for example, may be broadcast channels CH49, 50, 51 containing 6 MHz channel spacing, or channels containing 7^«3⁄4 channel spacing (1150, CH51, or channel CH47 including 8 MHz channel spacing, CH48. Accordingly, the first sub-band comprising these different channel spacings and the number of different active channels is referred to in the present invention as a frequency band adjacent or close to the land mobile communication system. There are two spectrum planning methods in the frequency range of 698MHz ~ 806MHz: 1) planning for FDD use; 2) planning for TDD system use. Moreover, in two different spectrum plans, the 698MHz ~ 703MHz bandwidth of 5MH is used as a protection band between terrestrial television broadcasting and mobile communication systems.

Corresponding to the scenario in which the FD MHz system is planned to be used in the range of 703 MHz to 803 MHz, the second sub-band 202 of the present invention is a part of the FDD uplink band, and the second sub-band 202 is paired with the sub-band 202D in the range of 703 MHz to 803 MHz. The spectrum deploys FDD cells. Moreover, the isolated frequency band between the second sub-band 202 and the first sub-band 201 includes a third sub-band 203 and a guard band 204, and is shared in the terrestrial television broadcasting system and the terrestrial mobile communication system in the first frequency band 201. The first transmitting channel and the first transmitting antenna are configured on the first receiving channel and the first receiving antenna are disposed on the second frequency band. The guard band 204 and the third sub-band existing between the first transmit channel and the first receive channel isolate the first transmit channel from the out-of-band leakage interference of the first receive channel, in order to further suppress the transmit channel on the first sub-band Out-of-band interference, the first transmit antenna is separately deployed from the first receive antenna case, and interference between the first sub-band and the second sub-band is further suppressed by spatial isolation or/and directionality of the antenna.

The second sub-band 202 and the third sub-band 203 of the present invention are all bands used in the uplink slot in the TDD band, corresponding to the scenario in which the TD MHz system is planned to be used in the range of 703 MHz to 803 MHz. Moreover, the isolated frequency band between the second sub-band 202 and the first sub-band 201 includes a third sub-band 203 and a guard band 204, and is shared in the terrestrial television broadcasting system and the terrestrial mobile communication system in the first frequency band 201. The first transmitting channel and the first transmitting antenna are configured on the first receiving channel and the first receiving antenna are disposed on the second frequency band. The guard band 204 and the third sub-band existing between the first transmit channel and the first receive channel suppress the out-of-band leakage interference of the first transmit channel to the first receive channel, in order to further suppress the transmission on the first sub-band The out-of-band interference of the channel separates the first transmit antenna from the first receive antenna case, and further suppresses interference between the first sub-band and the second sub-band by spatial isolation or/and directionality of the antenna. In a commercial deployment of an actual system, in the case of the transmission network of the shared site and the shared land mobile communication network according to the present invention, the television broadcast operator will be concerned with the coverage of the television broadcast signal transmitted by the shared base station and the shared transmission network. Quality and actual broadcast service delivery time, TV broadcast operators want to be able to monitor the coverage of low- and medium-power transmitters distributed across shared sites in real time. To this end, the present invention provides a technical approach to monitoring television broadcast channels on the first sub-band. Specifically, in a geographical area in which the broadcast channel on the first sub-band needs to be covered, a plurality of television broadcast channel monitoring devices are deployed, and the device receives the television broadcast signal on the first sub-band and transmits information of interest to the monitoring party. To the monitoring party. The judgment is made by one or a combination of the following methods: 1) comparing the broadcast code stream by wire, comparing with the received code stream; 2) judging by bit error rate; 3) judging by signal strength; television broadcast channel The method for the monitoring device to send the broadcast information on the monitored first sub-band may be one of the following: 1) transmitting over the air interface of the land mobile communication system; 2) transmitting through the wired transmission network, the wired transmission network may be a cable television The transmission network of the broadcasting system may also be the transmission network of the cellular mobile communication system.

One implementation of the illustrated television broadcast channel monitoring device is either deployed at a television receiver set top box or integrated with a television receiver or television receiver set top box.

When the second receiver and the second receiving antenna on the third sub-band 203 are deployed at the non-shared site and the non-shared site is geographically adjacent to the shared site, in order to suppress the shared site The interference of the out-of-band leakage power of the first transmitting channel to the second receiving antenna at the non-shared site avoids the main beam direction of the first transmitting antenna from the direction of the non-shared site. Proximity as used herein means that the distance between the non-shared site and the shared site is within a certain distance interval. The range of specific distances is between 50 and 500 meters; the typical range is between 50 and 200 meters.

Further, the service data of the mobile communication system is sent by using the first sub-band at least part of the time, and the mobile communication service data is one of the following: 1) MBMS service data; 2) sending downlink data download service; part of time refers to Within a few days of the day, or in one The mobile communication service data is transmitted on the first frequency band using the first transmission channel and the first transmission antenna during a certain period of time during the month.

Specifically, when transmitting mobile service data, inter-cell interference coordination is performed between a group of first transmitting channels located at different sites;

In transmitting the service data of the mobile communication system, the air interface technical specification of the mobile communication system is adopted, for example, a wireless technical specification formulated by the 3GPP standard organization;

The method of transmitting data for mobile communication using the first transmission channel belonging to the first sub-band of the terrestrial television broadcasting band includes one of the following two methods:

Further, the manner in which the first transmission channel shares the site with the land mobile communication system includes the following two types:

1. At least one first transmitting channel, a common antenna or a non-common antenna, is disposed at all mobile communication stations in a geographical area where the first receiving antenna is disposed on the second sub-band;

2. In a group of mobile communication sites in which a first receiving antenna is disposed in a second sub-band, and at least one station is selected as a shared station of the first transmitting channel and the first receiving channel of the mobile communication. Addressing, deploying at least one first transmitting channel on the shared site; the first transmitting channel is co-antenna or non-co-antenna with the first receiving channel;

In the first geographic area covered by the second sub-band, only medium and low power transmitters are deployed on the first sub-band, and no high-power transmitters are deployed. A high power transmitter is a transmitter with a power of 1000 watts or more; a medium and low power transmitter is a transmitter with a transmission power of less than 1000 watts. Typical power values for medium and low power transmitters range from 10 to 100W. Industrial applicability

The solution of the invention significantly reduces the out-of-band leakage caused by the transmission power of the traditional super-powered terrestrial television broadcast transmitter, and also significantly reduces the guard band width between the terrestrial television broadcasting system and the land mobile communication system, thereby improving the spectrum use efficiency. Replacing very large power transmitters with low-power distributed distributed terrestrial broadcast transmitters can also avoid stringent requirements for transmitter out-of-band leakage specifications and ease the cost of transmitters.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Claims

Claim

What is claimed is: 1. A method of suppressing out-of-band leakage interference, the method comprising: deploying medium power and/or in a first sub-band included in a first frequency band in a first geographic area covered by a second frequency band a first transmit channel of low power transmission, the first sub-band being adjacent or adjacent to a second frequency band, the first frequency band belonging to a planned frequency band of a terrestrial television broadcasting system, and the second frequency band belonging to a plan of a land mobile communication system Frequency band

2. The method of claim 1 wherein

The third sub-band is adjacent to the second sub-band, and the third sub-band is a frequency band used by a second uplink receiving channel at a non-shared site, and the second uplink receiving channel is a land mobile The communication base station receives the channel of the signal sent by the terminal on the third sub-band.

3. The method according to claim 1, wherein the second sub-band and the third sub-band are uplink frequency bands planned for use in a frequency division multiplexing FDD system or are planned to be time division multiplexed TDD systems. The frequency band used.

4. The method according to claim 2, wherein the method further comprises: at the shared site, the first transmit channel transmits on the first sub-band using a first transmit antenna, The first receiving channel receives on the second sub-band using a first receiving antenna;

5. The method of claim 2, further comprising: using, in the first geographic area, a first transmission configured at a set of shared sites on the first sub-band The channel transmits terrestrial television broadcast signals at the same frequency.

6. The method of claim 2, further comprising: using the first sub-band in a combination of one or more of the following:

7. The method according to claim 1, wherein the first transmission channel configured on the first sub-band transmits a signal in one of the following manners:

(2) transmitting a television broadcast signal to the television receiver using the television broadcast wireless technology specification in the first time interval in the first sub-band, and transmitting the signal to the mobile communication receiver using the mobile communication wireless technology specification in the second time interval, First time interval and second time interval value range In between a few minutes or hours.

The method according to claim 5, wherein the method further comprises: monitoring the terrestrial television broadcast signal of the first sub-band, specifically:

The measured parameters include at least one of the following:

1) the power at which the signal arrives at the monitoring device;

3) The bit error rate at the time of signal reception at the monitoring device.

10. A system for suppressing out-of-band leakage interference, characterized in that in the first geographical area covered by the second frequency band, a set of sites is determined as a terrestrial television from a site used by the land mobile communication base station. a shared site for broadcasting and land mobile communication networks;

The system also includes at least one first transmit channel deployed on the first sub-band, deployed in a first receiving channel on the second sub-band; wherein the first transmitting channel transmits a television broadcast signal with medium power and/or low power, and the first sub-band is adjacent or adjacent to the second frequency band, where A third sub-band belonging to the second frequency band exists between a sub-band and the second sub-band, and the third sub-band is used to suppress the out-of-band leakage power of the first transmission channel to the first receiving channel at the shared site interference.

11. The system according to claim 10, wherein the second sub-band and the third sub-band are uplink bands used for planning a frequency division multiplexing FDD system or are planned for a time division multiplexing TDD system. The frequency band used.

12. The system of claim 10, wherein:

13. The system of claim 10, wherein:

The first transmit channel transmits a signal in one of the following ways:

(2) transmitting a television broadcast signal to the television receiver using the television broadcast wireless technology specification in the first time interval in the first sub-band, and using the mobile communication wireless technology in the second time interval The specification transmits a signal to the mobile communication receiver, and the first time interval and the second time interval take a value ranging between several minutes or several hours.

A method for suppressing out-of-band interference of a transmission channel to a receiving channel, characterized in that the method is based on the method of claim 1, the method comprising:

The terminal performs television broadcast signal reception on one or more time slots on the television broadcast radio frame, and the terminal sends an uplink signal to the network side while receiving the television broadcast signal; the uplink signal is sent in a short data packet manner. The transmission time interval (ΤΉ) used to transmit data in a short packet manner is smaller than the fading time length that the television broadcast channel can withstand.

A terminal, comprising: a receiving module and a sending module; wherein, the receiving module is configured to perform a television broadcast signal on one or more time slots included in a television broadcast radio frame transmitted in the first subband Receive