Method and equipment for positioning far-end interference base station
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for positioning a remote interfering base station.
Background
The TD-LTE (TD-SCDMA Long Term Evolution) system adopts a time division duplex mode, and different base stations need to keep synchronization. When a far-end base station reaches a certain height level and a low-altitude atmospheric waveguide phenomenon exists (at the moment, propagation is similar to free space, signals can bypass a ground plane to realize over-the-horizon transmission), a Downlink signal transmitted by an interference base station in a high power mode in a conventional Downlink subframe and a DwPTS (Downlink Pilot Time Slot) may arrive at an Uplink Pilot Time Slot (UpPTS) of the interfered base station after propagation delay, and therefore the UpPTS of the interfered base station and even the receiving of Uplink service data are affected. As shown in fig. 1, which is a schematic diagram of a TD-LTE far-end interference scenario, in fig. 1, far-end interference is represented by a downlink signal of only one base station, but in an actual environment, the far-end interference may be a result of a cluster of base stations in close proximity to each other, that is, an interference signal may be an alias of downlink signals of multiple base stations.
As shown in fig. 2, a TDD (Time Division duplex) frame structure (5 ms transition interval) adopting TYPE2 (TYPE 2) in the TD-LTE system is shown, and a special subframe of the frame structure includes three special Time slots: DwPTS, GP (guard time slot), and UpPTS; a DwPTS transmits a PSS (Primary Synchronization Signal), a PCFICH (Physical Control Format Indicator Channel), a PDCCH (Physical Downlink Control Channel), a PHICH (Physical HARQ Indication Channel), a PDSCH (Physical Downlink Shared Channel), and the like among cell Downlink Synchronization signals; UpPTS transmits PRACH (Packet Random Access Channel) and SRS (Sounding Reference Signal), and cannot transmit PUSCH (Physical Uplink Shared Channel) and PUCCH (Physical Uplink Control Channel); GP is a guard time interval between DwPTS and UpPTS, mainly to avoid interference of data in DwPTS to data in UpPTS due to multipath delay.
In order to support cell radii of different sizes, various length configuration options of special subframes are provided in the TD-LTE system, that is, the lengths of 3 special timeslots are flexibly configurable, as shown in table 1, and are configuration formats of special subframes; for example, under a normal CP (Cyclic Prefix), the special subframe corresponding to the shortest GP length is configured as DwPTS: GP: UpPTS = 11: 1: 2 or DwPTS: GP: UpPTS = 12: 1: 1; the special subframe configuration corresponding to the longest GP length is DwPTS: GP: UpPTS = 3: 10: 1.
TABLE 1
In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art:
in the TD-LTE system, hot spot coverage is mainly considered in network deployment, and the far-end interference phenomenon is not very prominent, so that no positioning method for a far-end interference base station exists in the prior art.
Disclosure of Invention
The embodiment of the invention provides a method and equipment for positioning a far-end interference base station, which are used for determining the specific position of the far-end interference base station.
In order to achieve the above object, an embodiment of the present invention provides a method for positioning a remote interfering base station, including:
the interfered base station obtains the position information of the far-end interference base station;
and the network management equipment positions the far-end interference base station by utilizing the position information of the far-end interference base station reported by the plurality of interfered base stations.
The embodiment of the invention provides a method for positioning a far-end interference base station, which comprises the following steps:
network management equipment receives position information of a far-end interference base station reported by a plurality of interfered base stations;
and the network management equipment positions the far-end interference base station by using the position information of the far-end interference base station reported by the plurality of interfered base stations.
An embodiment of the present invention provides a base station device, including:
the acquisition module is used for acquiring the position information of the far-end interference base station;
and the sending module is used for informing the network management equipment of the position information of the far-end interference base station, and the network management equipment positions the far-end interference base station by using the position information of the far-end interference base station reported by the interfered base stations.
An embodiment of the present invention provides a network management device, including:
a receiving module, configured to receive location information of a remote interfering base station reported by multiple interfered base stations;
and the positioning module is used for positioning the far-end interference base station by utilizing the position information of the far-end interference base station reported by the interfered base stations.
Compared with the prior art, the embodiment of the invention at least has the following advantages: by positioning the specific geographical position of the far-end interference base station, the configuration and scheduling strategy of the far-end interference base station can be adjusted and optimized (i.e. the special subframe configuration of the far-end interference base station and the scheduling strategy of the DwPTS are adjusted) under the condition that the existence of the far-end interference is judged, so that the interference degree of the uplink subframe of the interfered base station is reduced, the influence of the far-end interference is avoided, and the receiving performance of the uplink channel of the interfered base station is ensured.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic diagram of a TD-LTE remote interference scenario in the prior art;
fig. 2 is a schematic diagram of a TDD frame structure using TYPE2 in a TD-LTE system in the prior art;
FIG. 3 is a diagram illustrating the effective GP length according to one embodiment of the present invention;
fig. 4 is a flowchart illustrating a method for positioning a remote interfering base station according to an embodiment of the present invention;
fig. 5 is a schematic diagram illustrating a principle of obtaining location information of a remote interfering base station according to a first embodiment of the present invention;
fig. 6 is a schematic structural diagram of a base station device according to a second embodiment of the present invention;
fig. 7 is a schematic structural diagram of a network management device according to a third embodiment of the present invention.
Detailed Description
The inventor notices in the process of implementing the invention that: under the condition of same-frequency networking, the existence of same-frequency interference among a plurality of cells is the inherent characteristic of a TDD system; the inter-cell co-channel interference of the TD-LTE system can be divided into: close range co-frequency interference and remote co-frequency interference. The close range co-channel interference is as follows: the uplink/downlink interference of two or more nearby cells due to the use of the same time-frequency resource includes: uplink interference of an interfering cell terminal to a interfered cell base station and downlink interference of the interfering cell base station to the interfered cell terminal; since such co-channel interference occurs between cells that are closely spaced, it is called close-range co-channel interference (near-end interference). The remote same-frequency interference is as follows: interference between base stations, specifically interference of a conventional downlink subframe and a DwPTS of a long-distance interference base station on a UpPTS and a conventional uplink subframe of a disturbed base station; in this case, since the interfering base station and the victim base station are generally far apart from each other in terms of distance, such co-channel interference between the base stations is called long-range co-channel interference (far-end interference).
Because a positioning method for a far-end interfering base station is not provided in the prior art, embodiments of the present invention provide a positioning method and a positioning device for a far-end interfering base station, which can adjust and optimize configuration and scheduling strategies of the far-end interfering base station by positioning a specific geographical location of the far-end interfering base station under the condition that it is determined that far-end interference exists, thereby reducing the interference degree of an uplink subframe of an interfered base station, avoiding the influence of the far-end interference, and ensuring the receiving performance of an uplink channel of the interfered base station.
The technical solutions in the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
The cause of the far-end interference shows that the special subframe configuration of the interfering base station cell and the interfered base station cell directly affects the severity of the far-end interference of the interfered base station, that is, the effective GP length of the interfered base station cell relative to the interfering base station cell affects the interference degree of the uplink channel of the interfered base station. As shown in fig. 3, the effective GP length is a schematic diagram, and the effective GP length is from the end time of the DwPTS of the interfering base station cell to the end time of the GP of the interfered base station cell. As can be seen from fig. 3, when the distance between the interfering base station and the interfered base station is fixed, the longer the length of the effective GP is, the earlier the downlink signal of the interfering base station ends, the smaller the probability that the uplink timeslot of the interfered base station is interfered, or the smaller the interference strength.
In various special subframe configurations of the TD-LTE system, the UpPTS only occupies the length of 1 or 2 OFDM (Orthogonal Frequency Division Multiplexing) symbols for transmitting SRS or PRACH Format4 (Format 4); the length of the DwPTS is 3-11 OFDM symbols, and the first 3 symbols are used for sending control channels PDCCH, PCFICH, PHICH and PSS; the remaining several symbols are used to transmit the PDSCH channel. Because the change range of the DwPTS length is large, the special subframe configuration of the interference cell base station is changed, the number of symbols occupied by the DwPTS is reduced, and the length of the effective GP of the interfered cell base station relative to the interference cell base station can be effectively prolonged; or when the length of the DwPTS of the interfering cell is greater than 3 OFDM symbols, the scheduling priority of the PDSCH channel in the DwPTS is reduced, and the influence degree of the far-end interference on the base station of the interfered cell can also be reduced.
Based on the above analysis, an application scenario of the method may be a TD-LTE system, and the method, according to the embodiment of the present invention, positions a specific position of a far-end interfering base station by measuring a far-end interfering signal and under a condition that it is determined that far-end interference exists, so as to appropriately adjust a special subframe configuration of the far-end interfering base station and a scheduling policy of a DwPTS, so as to avoid an influence of the far-end interference and ensure an uplink channel receiving performance of an interfered base station; as shown in fig. 4, the method for positioning a remote interfering base station includes the following steps:
step 401, the interfered base station obtains the position information of the far-end interference base station. The position information of the far-end interference base station comprises: the distance between the far-end interfering base station and the interfered base station; and the incoming wave direction of the far-end interference signal of the far-end interference base station.
In the embodiment of the invention, the interfered base station obtains the position information of the far-end interference base station by measuring the far-end interference signal, and the interfered base station can obtain the position of the far-end interference base station by the distance between the far-end interference base station and the interfered base station and the incoming wave direction of the far-end interference signal; specifically, the obtaining, by the interfered base station, the position information of the remote interfering base station includes: under the condition that the far-end interference exists, the interfered base station obtains the transmission time delay of the far-end interference signal reaching the local area (namely the interfered base station cell), and obtains the distance between the far-end interference base station and the interfered base station according to the transmission time delay; and the interfered base station obtains the incoming wave direction of the far-end interference signal, namely AOA (angle of arrival) through the measurement of the intelligent antenna.
As shown in fig. 5, in order to obtain the schematic diagram of the position information of the far-end interfering base station, the interfered base station may determine, through the smart antenna, that the far-end interfering base station (i.e., the interference source) is located on a ray with the interfered base station as a starting point, and then, in combination with the distance L between the far-end interfering base station and the interfered base station, the far-end interfering base station is located on a circle with the interfered base station as a circle center and the distance L as a radius, so that an intersection point of the ray and the circle may be determined as the position of the far-end interfering base station.
Further, the obtaining, by the interfered base station, the location information of the remote interfering base station includes: the interfered base station continuously or periodically measures the distance between the far-end interference base station and the interfered base station in the far-end interference measurement subframe, and obtains the distance between the far-end interference base station and the interfered base station after averaging or smoothing the distance between the far-end interference base station and the interfered base station obtained by multiple measurements; and the interfered base station continuously or periodically measures the incoming wave direction of the far-end interference signal in the far-end interference measurement subframe, and obtains the incoming wave direction of the far-end interference signal after averaging or smoothing the incoming wave direction of the far-end interference signal obtained by multiple measurements.
Step 402, the interfered base station notifies the network management equipment of the position information of the far-end interference base station.
The method for informing the network management equipment of the position information of the remote interference base station by the interfered base station comprises the following steps: the interfered base station directly informs the network management equipment of the distance between the far-end interference base station and the interfered base station and the incoming wave direction of the far-end interference signal; or, the interfered base station calculates the longitude and latitude information of the position of the far-end interference base station based on the longitude and latitude information (such as longitude and latitude coordinates, namely geographical position information) of the interfered base station, the distance between the far-end interference base station and the interfered base station and the incoming wave direction of the far-end interference signal, and notifies the network management equipment of the longitude and latitude information of the position of the far-end interference base station, the distance between the far-end interference base station and the interfered base station and the incoming wave direction of the far-end interference signal.
Step 403, the network management device receives the location information of the remote interfering base station reported by the multiple interfered base stations. Each interfered base station reports the position information of the remote interfering base station obtained by the interfered base station according to the manner of the steps 401 to 402, so that the network management equipment can receive the position information of the remote interfering base stations reported by a plurality of interfered base stations.
Step 404, the network management device locates the far-end interfering base station by using the position information of the far-end interfering base station reported by the multiple interfered base stations.
The network management equipment uses the position information of the far-end interference base station reported by a plurality of interfered base stations to position the far-end interference base station, and the method comprises the following steps: when the position information of the far-end interference base station reported by the interfered base stations is a certain area, the network management equipment positions the area as the area where the far-end interference base station is located.
In the embodiment of the invention, the network management equipment can jointly position the far-end interference base station by utilizing the position information of the far-end interference base station reported by a plurality of interfered base stations in a certain area, and can further confirm the existence of the far-end interference, thereby improving the positioning accuracy of the far-end interference base station; specifically, if a plurality of interfered base stations locate the remote interfering base station in a certain area, the base stations in the area are considered as the remote interfering base stations.
In the embodiment of the invention, the configuration and the scheduling strategy of the far-end interference base station can be adjusted and optimized (namely, the special subframe configuration of the far-end interference base station and the scheduling strategy of the DwPTS are adjusted) under the condition of judging that the far-end interference exists by positioning the specific geographic position of the far-end interference base station (firstly, the distance between the far-end interference base station and the interfered base station, the direction of incoming waves and other measurement quantities are positioned through a single interfered base station so as to estimate the position of the far-end interference base station, and then, the positioning results of a plurality of interfered base stations in a certain area are utilized to perform combined positioning on the far-end interference base station), so that the interference degree of an uplink subframe of the interfered base station is reduced, the influence of the far-end interference is avoided, and the receiving performance of an uplink channel of the interfered base.
Example two
Based on the same inventive concept as the above method, an embodiment of the present invention further provides a base station apparatus, as shown in fig. 6, where the base station apparatus includes:
an obtaining module 11, configured to obtain location information of a remote interfering base station;
the sending module 12 is configured to notify the network management device of the location information of the remote interfering base station, and the network management device locates the remote interfering base station by using the location information of the remote interfering base station reported by the multiple interfered base stations.
The position information of the far-end interference base station comprises: the distance between the far-end interference base station and the interfered base station; and the incoming wave direction of the far-end interference signal of the far-end interference base station.
The obtaining module 11 is specifically configured to obtain a transmission delay of the far-end interference signal reaching a local area, and obtain a distance between the far-end interference base station and an interfered base station according to the transmission delay; and measuring the incoming wave direction of the far-end interference signal through a smart antenna.
The obtaining module 11 is further configured to continuously or periodically measure a distance between the far-end interfering base station and the interfered base station in the far-end interference measurement subframe, and obtain the distance between the far-end interfering base station and the interfered base station after averaging or smoothing the distance between the far-end interfering base station and the interfered base station obtained through multiple measurements; and continuously or periodically measuring the incoming wave direction of the far-end interference signal in the far-end interference measurement subframe, and obtaining the incoming wave direction of the far-end interference signal after averaging or smoothing the incoming wave direction of the far-end interference signal obtained by multiple measurements.
The sending module 12 is specifically configured to directly notify the network management device of the distance between the far-end interfering base station and the interfered base station and the incoming wave direction of the far-end interfering signal; or,
and calculating the longitude and latitude information of the position of the far-end interference base station based on the longitude and latitude information of the far-end interference base station, the distance between the far-end interference base station and the interfered base station and the incoming wave direction of the far-end interference signal, and informing the network management equipment of the longitude and latitude information of the position of the far-end interference base station, the distance between the far-end interference base station and the interfered base station and the incoming wave direction of the far-end interference signal.
The modules of the device can be integrated into a whole or can be separately deployed. The modules can be combined into one module, and can also be further split into a plurality of sub-modules.
EXAMPLE III
Based on the same inventive concept as the above method, an embodiment of the present invention further provides a network management device, as shown in fig. 7, the network management device includes:
a receiving module 21, configured to receive location information of a remote interfering base station reported by multiple interfered base stations;
and a positioning module 22, configured to position the far-end interfering base station by using the position information of the far-end interfering base station reported by the multiple interfered base stations.
The position information of the far-end interference base station comprises: a distance between the far-end interfering base station and the interfered base station; and the incoming wave direction of the far-end interference signal of the far-end interference base station.
The positioning module 22 is specifically configured to, when the location information of the remote interfering base station reported by the multiple interfered base stations is a certain area, position the area as an area where the remote interfering base station is located.
The modules of the device can be integrated into a whole or can be separately deployed. The modules can be combined into one module, and can also be further split into a plurality of sub-modules.
Through the above description of the embodiments, those skilled in the art will clearly understand that the present invention may be implemented by software plus a necessary general hardware platform, and certainly may also be implemented by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.
Those skilled in the art will appreciate that the drawings are merely schematic representations of one preferred embodiment and that the blocks or flow diagrams in the drawings are not necessarily required to practice the present invention.
Those skilled in the art will appreciate that the modules in the devices in the embodiments may be distributed in the devices in the embodiments according to the description of the embodiments, and may be correspondingly changed in one or more devices different from the embodiments. The modules of the above embodiments may be combined into one module, or further split into multiple sub-modules.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
The above disclosure is only for a few specific embodiments of the present invention, but the present invention is not limited thereto, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present invention.