CN114205014A - Cross time slot interference processing method, base station, device and medium - Google Patents
Cross time slot interference processing method, base station, device and medium Download PDFInfo
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Abstract
The invention discloses a cross time slot interference processing method, a base station, a device and a medium, comprising the following steps: when the interfered base station detects the cross time slot interference, determining an interference base station; the interfered base station detects the RIM-RS on the corresponding uplink resource of the downlink resource of the RIM-RS sent by each interference base station, wherein each interference base station sends the RIM-RS on different resources; and the base station sends the RIM-RS on the appointed resource, and determines the cell ID and the interference strength of the interference source according to the detected corresponding relation between the resource of the RIM-RS and the interference base station sending the RIM-RS. By adopting the invention, the system overhead is reduced and the system performance is improved; the method can identify the interference source and the interference strength in the beam direction and even in the extremely narrow beam direction, so that the performance is better, the interference back-off can be implemented more flexibly and more accurately, and the performance is better.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a method, a base station, a device, and a medium for processing cross slot interference.
Background
In a mobile communication system, for a TDD (Time Division Duplex) system, if a frame structure of dynamic TDD is adopted by adjacent/neighboring cells, or a static frame structure of the adjacent/neighboring cells is not consistent, or a subcarrier interval of two cells is not consistent, cross slot interference may be generated, and when there is a same frequency between the adjacent/neighboring cells, the interference intensity may be large and unacceptable. Fig. 1 is a schematic diagram of cross slot interference, taking a 5G NR (New Radio) TDD mobile communication system as an example, when dynamic slot scheduling is used, two base stations may have different transmission directions in some slots, and then the interference shown in fig. 1 may be generated.
For the identification of cross-slot interferers, the current scheme is mainly a scheme without identification or adjacent cell level identification.
Fig. 2 is a schematic diagram of a scheme for identifying a non-interference source, as shown in the figure, in the non-identification scheme, the interference source is not identified, when an interfered base station detects cross slot interference, all adjacent or nearby base stations are considered as the interference source, and an interference back-off scheme is implemented at the same time.
Fig. 3 is a schematic diagram of CSI-RS detection, and a scheme of adjacent cell identification means that an interfered base station performs interference identification according to measurement of broadcasts of surrounding cells and CSI-RS (CSI Reference Signal; CSI: Channel State Information), but because the broadcasts of the cells and CSI-RS signals are overlapped, the cells cannot be effectively identified under the multi-cell condition. In addition, the distance of the cross time slot interference can reach more than ten kilometers, and under the condition, the broadcasting and CSI-RS signals cross the time slot boundary, and cannot be effectively measured. Taking the distance of 3km as an example, at a sub-carrier interval of 30kHz, the length of CP (Cyclic prefix) is 2.34us, and when the transmission delay is 3km/300000km/s is 10us > > CP length, the receiving side cannot detect a complete CSI-RS signal. Therefore, only effective interference identification can be performed on the neighboring cells through broadcasting and CSI-RS, as shown in fig. 3.
In the 5G NR protocol, RIM-RS (Remote Interference Management Reference Signal) is introduced for far-end Interference identification, and may be used for Interference identification of cells far away from each other, but in the scheme, RIM-RS is mainly used for identification of far-end Interference generated by an atmospheric waveguide, and there is no concept of a beam, and RIM-RS cannot be used for more accurate Interference identification, so as to implement a beam-level Interference avoidance strategy.
The defects of the prior art are as follows:
for interference-free source identification, the solution is simple, but not all potential interference sources will be true interference sources, and thus the cost is very large.
For the scheme of identifying the interference source based on broadcasting and CSI-RS, on one hand, identification is difficult due to signal overlapping, and on the other hand, identification cannot be realized due to the limitation of interference distance.
For the existing scheme based on the RIM-RS, accurate identification of beam levels cannot be achieved.
Disclosure of Invention
The invention provides a cross time slot interference processing method, a base station, a device and a medium, which are used for identifying an interference source during cross time slot interference.
The embodiment of the invention provides the following technical scheme:
a cross-slot interference processing method comprises the following steps:
when the interfered base station detects the cross time slot interference, determining an interference base station;
the interfered base station detects the RIM-RS on the corresponding uplink resource of the downlink resource of the RIM-RS sent by each interference base station, wherein each interference base station sends the RIM-RS on different resources;
and determining the cell ID and the interference strength of the interference source according to the detected corresponding relation between the resource of the RIM-RS and the interference base station sending the RIM-RS.
In the implementation, the interfered base station detects the RIM-RS on the uplink resource corresponding to the last 2 symbol positions of the downlink resource of the interfered base station.
In an implementation, the method further comprises the following steps:
and the interfered base station informs the OMC to carry out interference coordination.
In the implementation, the interference base station is determined through the OMC; or the like, or, alternatively,
after sending RIM-RS, the disturbing base station is determined after being detected by the disturbing base station; or the like, or, alternatively,
and after the interfered base station sends the RIM-RS, the interfered base station is determined after being detected by other base stations.
In an implementation, the method further comprises the following steps:
and the interfered base station informs at least one interference source to transmit the RIM-RS in the beam direction.
In an implementation, the method further comprises the following steps:
and the interfered base station configures the interference base station to transmit RIM-RS in the appointed time frequency resource position according to the beam direction with the angle smaller than the previous beam through the OMC.
In an implementation, the method further comprises the following steps:
and the interfered base station identifies the interference source at the beam level according to the detected position of the RIM-RS.
In an implementation, the method further comprises the following steps:
and the interfered base station informs the OMC to coordinate interference among all the beam directions.
In the implementation, the interfered base station informs the OMC to coordinate the interference between all the beam directions, and the OMC informs the interfering base station to send null-steering beams in the direction of the interference beams to coordinate the interference between all the beam directions; or the like, or, alternatively,
the codebook of the interfering beam directions is restricted by using a codebook restriction subset mode to coordinate the interference among the beam directions; or the like, or, alternatively,
interference between the various beam directions is coordinated through spatial filtering.
A cross-slot interference processing method comprises the following steps:
the base station receives an indication of sending the RIM-RS;
and the base station transmits the RIM-RS on the appointed resources.
In an implementation, the base station transmits the RIM-RS at the last 2 symbol positions of the downlink resource.
In an implementation, the method further comprises the following steps:
and the base station performs interference coordination according to the notification of the OMC.
In the implementation, the base station receives the indication of sending the RIM-RS, and receives the indication of the OMC; or the like, or, alternatively,
is an indication to receive a disturbed base station.
In an implementation, the method further comprises the following steps:
the base station receives an indication to transmit the RIM-RS on the beam;
and the base station transmits the RIM-RS on the appointed beam resource.
In an implementation, the method further comprises the following steps:
the base station receiving an indication to transmit a RIM-RS on a narrower beam, the narrower beam having a smaller angle than a previous beam;
the base station transmits the RIM-RS on the agreed narrower beam resources.
In an implementation, the method further comprises the following steps:
and the base station coordinates the interference among all the wave beam directions according to the notification of the OMC.
In the implementation, the base station coordinates the interference between the beam directions, and transmits a null beam in the direction of the interference beam to coordinate the interference between the beam directions; or the like, or, alternatively,
the codebook of the interfering beam directions is restricted by using a codebook restriction subset mode to coordinate the interference among the beam directions; or the like, or, alternatively,
interference between the various beam directions is coordinated through spatial filtering.
A base station, comprising:
a processor for reading the program in the memory, performing the following processes:
when cross time slot interference is detected, determining an interference base station;
detecting the RIM-RS on corresponding uplink resources of downlink resources of RIM-RS sent by each interference base station, wherein each interference base station sends the RIM-RS on different resources;
determining the cell ID and the interference strength of an interference source according to the detected corresponding relation between the resource of the RIM-RS and an interference base station sending the RIM-RS;
a transceiver for receiving and transmitting data under the control of the processor.
In the implementation, the RIM-RS is detected on the uplink resource corresponding to the last 2 symbol positions of the downlink resource of the interference base station.
In an implementation, the method further comprises the following steps:
and informing the OMC to perform interference coordination.
In the implementation, the interference base station is determined through the OMC; or the like, or, alternatively,
after sending RIM-RS, the disturbing base station is determined after being detected by the disturbing base station; or the like, or, alternatively,
and after the interfered base station sends the RIM-RS, the interfered base station is determined after being detected by other base stations.
In an implementation, the method further comprises the following steps:
and informing at least one interference source to transmit the RIM-RS in the beam direction.
In an implementation, the method further comprises the following steps:
and configuring the interference base station through the OMC to send the RIM-RS at the appointed time frequency resource position according to the beam direction with the angle smaller than the previous beam.
In an implementation, the method further comprises the following steps:
based on the detected location of the RIM-RS, the source of interference at the beam level is identified.
In an implementation, the method further comprises the following steps:
the OMC is informed to coordinate the interference between the various beam directions.
In the implementation, the OMC is informed to coordinate the interference between the beam directions, and the OMC informs the interference base station to send null-steering beams in the direction of the interference beams so as to coordinate the interference between the beam directions; or the like, or, alternatively,
the codebook of the interfering beam directions is restricted by using a codebook restriction subset mode to coordinate the interference among the beam directions; or the like, or, alternatively,
interference between the various beam directions is coordinated through spatial filtering.
A cross-slot interference processing apparatus, comprising:
the interference applying determining module is used for determining an interference applying base station when the cross time slot interference is detected;
the device comprises a detection module, a sending module and a receiving module, wherein the detection module is used for detecting the RIM-RS on the corresponding uplink resource of the downlink resource of the RIM-RS sent by each interference base station, and each interference base station sends the RIM-RS on different resources;
and the interference determining module is used for determining the cell ID and the interference strength of the interference source according to the corresponding relation between the detected resources of the RIM-RS and the interference base station sending the RIM-RS.
A base station, comprising:
a processor for reading the program in the memory, performing the following processes:
receiving an indication to transmit a RIM-RS;
sending RIM-RS on the appointed resource;
a transceiver for receiving and transmitting data under the control of the processor.
In implementation, the RIM-RS is transmitted on the last 2 symbol positions of the downlink resource.
In an implementation, the method further comprises the following steps:
and carrying out interference coordination according to the notification of the OMC.
In the implementation, the indication of sending the RIM-RS is received, and the indication of receiving the OMC is received; or the like, or, alternatively,
is an indication to receive a disturbed base station.
In an implementation, the method further comprises the following steps:
receiving an indication to transmit a RIM-RS on a beam;
and transmitting the RIM-RS on the appointed beam resource.
In an implementation, the method further comprises the following steps:
receiving an indication to transmit a RIM-RS on a narrower beam, the narrower beam having an angle that is smaller than a previous beam;
the RIM-RS is transmitted on the agreed narrower beam resources.
In an implementation, the method further comprises the following steps:
and coordinating interference among all beam directions according to the notification of the OMC.
In the implementation, the interference between the beam directions is coordinated by transmitting a null notch beam in the direction of the interference beam to coordinate the interference between the beam directions; or the like, or, alternatively,
the codebook of the interfering beam directions is restricted by using a codebook restriction subset mode to coordinate the interference among the beam directions; or the like, or, alternatively,
interference between the various beam directions is coordinated through spatial filtering.
A cross-slot interference processing apparatus, comprising:
a receiving module, configured to receive an indication to send a RIM-RS;
and the sending module is used for sending the RIM-RS on the appointed resource.
A computer-readable storage medium storing a computer program for executing the above-described cross-slot interference processing method.
The invention has the following beneficial effects:
in the technical scheme provided by the embodiment of the invention, a two-stage interference identification scheme, namely cell-level interference identification and beam-level interference identification, is introduced for cross slot interference source identification.
The usage mode of the RIM-RS is expanded, and the method is used for cross time slot interference source identification between adjacent, close or far-spaced cells. And the interfered base stations identify interference sources according to the detected ID and interference strength of the RIM-RS, so as to realize cell-level interference identification. For cell-level interference source determination, the victim station may transmit RIM-RS, which is detected by surrounding base stations to determine which base stations are the offender stations, interference strength, and the like.
And introducing a beam level RIM-RS, and transmitting through different beams of the interference base station RIM-RS to identify the interference beam direction so as to realize the interference identification at the beam level.
Furthermore, for the cross-slot interference, a two-stage back-off scheme is introduced, namely a cell-level scheme and a beam-level scheme, wherein the cell-level scheme can be power back-off, downlink symbol back-off and the like, and the beam-level scheme can be a fine interference back-off mode such as beam null, codebook subset restriction, spatial filtering and the like.
Therefore, compared with a scheme without interference source identification, the scheme can identify the interference source, and only the interference source is needed to implement an interference back-off scheme, so that the system overhead is reduced, and the system performance is improved;
compared with the scheme of interference source identification based on broadcasting and CSI-RS, the scheme can be used for cells far away from each other on one hand, and can accurately identify the interference source on the other hand, so that a fine interference back-off scheme is implemented for the interference source, thereby reducing the system overhead and improving the system performance;
compared with the interference identification technology based on the RIM-RS, the scheme uses the RIM-RS to identify the cell-level and beam-level multi-level interference sources, can identify the beam direction and even the extremely narrow beam direction, and therefore has better performance.
On the basis of the interference identification technology of the scheme, the interference avoidance scheme with different precisions of a cell level and a beam level is adopted, so that the interference avoidance can be implemented more flexibly and more accurately, and the performance is better.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a diagram illustrating cross-slot interference in the prior art;
FIG. 2 is a schematic diagram of a solution for identifying a non-interfering source in the background art;
FIG. 3 is a diagram illustrating CSI-RS detection in the background art;
FIG. 4 is a diagram illustrating a plurality of interferers according to an embodiment of the invention;
fig. 5 is a schematic flow chart illustrating an implementation of a cross timeslot interference processing method according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a time domain structure of a RIM-RS symbol according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of RIM-RS detection in an embodiment of the invention;
FIG. 8 is a diagram illustrating locations of RIM-RS symbols transmitted by scrambling base stations according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of RIM-RS resources according to an embodiment of the present invention;
FIG. 10 is a schematic diagram of RIM-RS transmitting different beam directions with time offset by the interfering base station in the embodiment of the present invention;
fig. 11 is a flowchart illustrating an implementation of a cross timeslot interference processing method at the interfering base station side in the embodiment of the present invention;
FIG. 12 is a schematic diagram illustrating a cross-slot interference source identification process based on RIM-RS according to an embodiment of the present invention;
fig. 13 is a schematic diagram of a base station structure 1 according to an embodiment of the present invention;
fig. 14 is a schematic diagram of a base station structure 2 according to an embodiment of the present invention.
Detailed Description
The inventor notices in the process of invention that:
fig. 4 is a schematic diagram of multiple interference sources, and as shown, the interference experienced by the gNB2 in the example is from one interference source, the gNB1, but in actual networking, the interference of the gNB2 may be from multiple interference sources, as shown in fig. 4. In this case, consideration is given to how the true interference source is identified from a plurality of possible interference sources.
Based on this, the embodiment of the present invention provides an interference source determination scheme, which can identify an interference source, thereby improving system performance.
The following describes embodiments of the present invention with reference to the drawings.
In the process of description, the implementation of the interfered base station and the interfering base station will be described separately, and then an example of the cooperative implementation of the two will be given to better understand the implementation of the scheme given in the embodiment of the present invention. Such an explanation does not mean that the two are necessarily implemented together or separately, and actually, when the interfered base station and the interfering base station are implemented separately, the two solve the problem on their own side, and when the two are used in combination, a better technical effect is obtained.
Fig. 5 is a schematic flowchart of an implementation of a cross-slot interference processing method, as shown in the figure, the implementation may include:
In implementation, when the interfered base station detects the cross slot interference, the interfering base station is preliminarily determined. The detection of the cross timeslot interference may be that the interference level exceeds a preset cross timeslot interference detection threshold, or that the service channel block error rate exceeds a preset threshold or other feasible detection methods; the preliminary determination of the interfering base stations may be determined by considering factors such as distance, base station type, base station transmission power, network topology, and the like, or a possible interfering base station list may be determined for each base station in advance according to the factors. Then, only the preliminarily determined disturbing base stations are needed to transmit or receive the RIM-RS, so that accurate interference source identification can be carried out.
Specifically, in order to solve the problem of remote interference between base stations of the TDD system, a new reference signal RIM-RS is introduced. The RIM-RS is introduced to solve the problem of remote interference management, but the RIM-RS can also be used to identify the interference source of the cross slot, and when the interference distance is far away, the RIM-RS is more advantageous than the broadcast and CSI-RS because the RIM-RS adopts a time domain structure different from the broadcast and CSI-RS, and fig. 6 is a schematic diagram of the time domain structure of a RIM-RS symbol, and the time domain structure of the RIM-RS symbol is shown in the figure.
Therefore, in the case of a long distance, at least one complete RIM-RS can be detected in an effective detection window by receiving a gNB (NR node, NR NodeB; NR: 5G New air interface, New Radio), and fig. 7 is a RIM-RS detection diagram, which is shown in the figure.
In order for the victim base station to detect the RIM-RS in the S slot (special slot) and the UL slot (uplink slot), the aggressor base station should transmit the RIM-RS at the position corresponding to the cross slot. Considering the distance range where the cross-slot interference occurs, as an example, the RIM-RS may be transmitted at the last 2 symbol positions of the downlink of the interfering base station. That is, in the implementation, the interfered base station detects the RIM-RS at the last 2 symbol positions on the corresponding uplink resource. Fig. 8 is a schematic diagram of positions of symbols of the RIM-RS transmitted by the interfering base station, and fig. 8 describes a scheme for cross-slot interference source identification by using the RIM-RS.
In order to avoid that the RIM-RSs sent by a plurality of interference base stations are overlapped together and cannot be identified, the interference base stations need to send time, frequency and code resources when staggered, and the interfered base stations need to detect the RIM-RSs on corresponding uplink resources of downlink resources of the RIM-RSs sent by all the interference base stations. For example, still taking fig. 4 as an example, fig. 9 is a resource diagram of RIM-RS, as shown, gNB1 transmits RIM-RS in resource 1, and gNB3 transmits RIM-RS in resource 2; then the gNB1 needs to idle out resource 2 and the gNB3 needs to idle out resource 1; the gNB2 detects on both resources 1 and 2, considering the gNB1 as an interferer if the gNB2 detects RIM-RS on resource 1, and considering the gNB3 as an interferer if the gNB2 detects RIM-RS on resource 2. As an embodiment, the downlink resource 1 and the downlink resource 2 may be time-frequency resources of corresponding RIM-RS in two different radio frames, or RIM-RS resources of different symbols in the same radio frame, or RIM-RS resources of different frequencies in the same radio frame, or RIM-RS resources of different code domains.
For time, frequency and code resources for sending RIM-RS, the disturbing base station and the disturbed base station can inform the other side of own time frequency resources through interactive information, or can be uniformly configured by OMC. When the number of the base stations is large, in order to avoid resource conflict, the OMC can be selected to be uniformly configured. In this embodiment, OAM is used to configure the RS uniformly, that is, which time-frequency resources are used by each bs to transmit or detect RIM-RS, is configured uniformly by OMC.
By sending a cell-level RIM-RS by the offending base station, the victim base station can identify the cell-level interferer. In order to achieve more accurate interference identification and achieve the purpose of beam level interference source identification, as an embodiment, beam level interference source identification based on RIM-RS can be performed in a further manner.
In the implementation, the method can further comprise the following steps:
and the interfered base station informs at least one interference source to transmit the RIM-RS in the beam direction.
For example, when the interference of the interference source exceeds a certain threshold, more accurate interference identification based on the basic beam can be performed, that is, the interfered base station performs further interference source judgment at a narrower beam level according to the interference source identification result.
Specifically, after the interference source at the cell level is determined, further, the interfering base station may send RIM-RSs in different beam directions on different time-frequency resources, so that when the interfered base station detects the interference, the interference condition at the beam level of the interfering base station may be further identified. For example, the gNB2 detects two interference sources, gNB1 and gNB3, in the interference area, and assuming that the interference of the interference sources exceeds a certain threshold, more accurate interference identification based on the basic beam can be performed. Assuming that each interferer has 4 possible interfering beam directions, the different beam directions are distinguished by beam ID, assuming that the interference strength of the gNB1 exceeds a certain threshold, the gNB1 may transmit RIM-RS of different beam directions at different times, and the scheme is illustrated as follows:
fig. 10 is a schematic diagram of the RIM-RS for interfering the base station to transmit different beam directions with time offset, and similar to fig. 9, the RIM-RS in fig. 10 can be distinguished by using time domain, frequency domain, code domain, and the like. For example, the interfering base station may also select the RIM-RS to transmit in different beam directions with a frequency offset. In practical application, the RIM-RS may be transmitted in a manner of considering a combination of time and frequency resources. For different base stations, the RIM-RS can be transmitted by considering code domain staggering.
In practice, whether to transmit the beam level RIM-RS may be selected according to different interference back-off strategies. Accordingly, a cell-level or beam-level interference mitigation scheme may be implemented. Namely:
in the implementation, the method may further include:
and the interfered base station informs the OMC to carry out interference coordination.
In the implementation, the method may further include:
and the interfered base station informs the OMC to coordinate interference among all the beam directions.
In addition to using the null of the transmitted signal beam, the interfering base station may also use a codebook to limit the codebook in the interfering beam direction, so as to achieve the beam-level back-off of the interference. Namely:
in the implementation, the interfered base station informs the OMC to coordinate the interference between all the beam directions, and the OMC informs the interfering base station to send null-steering beams in the direction of the interference beams to coordinate the interference between all the beam directions; or the like, or, alternatively,
the codebook of the interfering beam directions is restricted by using a codebook restriction subset mode to coordinate the interference among the beam directions; or the like, or, alternatively,
interference between the various beam directions is coordinated through spatial filtering.
In order to identify a finer interference direction, the victim base station may also inform the aggressor base station to transmit RIM-RS at a narrower beam level in the interference direction, such as 3 narrow beams with a beam width of 10 ° in a 30 ° coverage of beam ID1, with beam ID of 0 'to 2', to determine beam interference in the 10 ° direction. The interfered base station can identify a finer interference direction by detecting the RIM-RS. The victim base station then informs the OMC to coordinate the interference between the various beam directions. Namely:
in the implementation, the method can further comprise the following steps:
and the interfered base station informs at least one interference source to transmit the RIM-RS in the beam direction with the angle smaller than the last beam.
Correspondingly, the embodiment of the invention also provides a corresponding processing scheme of the disturbing base station side, which is explained below.
Fig. 11 is a schematic flow chart of an implementation of a cross timeslot interference processing method at the interfering base station side, as shown in the figure, the method may include:
In an implementation, the base station transmits the RIM-RS at the last 2 symbol positions of the downlink resource.
In an implementation, the method further comprises the following steps:
and the base station performs interference coordination according to the notification of the OMC.
In the implementation, the base station receives the indication of sending the RIM-RS, and receives the indication of the OMC; or the like, or, alternatively,
is an indication to receive a disturbed base station.
In an implementation, the method further comprises the following steps:
the base station receives an indication to transmit the RIM-RS on the beam;
and the base station transmits the RIM-RS on the appointed beam resource.
In an implementation, the method further comprises the following steps:
the base station receiving an indication to transmit a RIM-RS on a narrower beam, the narrower beam having a smaller angle than a previous beam;
the base station transmits the RIM-RS on the agreed narrower beam resources.
In an implementation, the method further comprises the following steps:
and the base station coordinates the interference among all the wave beam directions according to the notification of the OMC.
In the implementation, the base station coordinates the interference between the beam directions, and transmits a null beam in the direction of the interference beam to coordinate the interference between the beam directions; or the like, or, alternatively,
the codebook of the interfering beam directions is restricted by using a codebook restriction subset mode to coordinate the interference among the beam directions; or the like, or, alternatively,
interference between the various beam directions is coordinated through spatial filtering.
The following is an example.
Fig. 12 is a schematic diagram of a cross timeslot interference source identification process based on RIM-RS, in which a process of sending a notification message to all base stations in an area by an OMC (Operation & Management Center) is omitted, and the process may be as follows:
1. and the interfered base station detects the cross time slot interference and informs the OMC to start interference source identification.
In the implementation, the interference base station is determined by the OMC; or the like, or, alternatively,
after sending RIM-RS, the disturbing base station is determined after being detected by the disturbing base station; or the like, or, alternatively,
and after the interfered base station sends the RIM-RS, the interfered base station is determined after being detected by other base stations.
That is, for cell-level interference source determination, the victim station may transmit RIM-RS, which is detected by surrounding base stations to determine which base stations are the offender stations.
2. And the interference base station sends cell-level RIM-RS at the last downlink symbol positions of the special time slot, in order to avoid the condition that the RIM-RS are overlapped and cannot be identified, each interference base station needs to stagger time or frequency or code domain resources for sending, and other interference base stations need to set the resources to be idle.
3. And the interfered base station detects the RIM-RS on the corresponding uplink resource of the downlink resource of the RIM-RS sent by all the interfered base stations, and judges the cell ID and the interference intensity of the interference source according to the position of the detected RIM-RS.
4. And the interfered base station informs the OMC to carry out interference coordination: the OMC notifies the interfering base station to implement a cell-level interference back-off scheme, such as power back-off, downlink symbol back-off, etc., and the OMC may also turn on beam-level interference source identification (for example, interference intensity exceeds a certain threshold, or the interfering base station has an interference back-off measure for sending beam null), and then performs the following steps.
5. The victim base station informs the interferer (possibly more than one, assuming the interferer is interfering base station a as an example) to send RIM-RS in the beam direction.
6. And the interference base station A sends RIM-RSs at the beam level by staggering time or frequency resources, for example, 4 beams are sent, the IDs are 0-3, and the coverage angle of each beam is 30 degrees.
7. And the interfered base station identifies the interference source at the beam level according to the detected position of the RIM-RS.
8. And the interfered base station informs the OMC to coordinate interference among all the beam directions. As an example, the OMC may inform the interfering base station to transmit null-steering beams in the direction of the interfering beam (e.g., the interfering beam is beam ID 1).
9. The interfering base station transmits beam ID1 in the 30 null direction. Further, if a more accurate interference beam direction is desired, further interference identification may be performed, and the following steps are continued:
10. the interfered base station informs the interfered base station to transmit RIM-RS with narrower beam level in the interference direction, and determines the beam interference in the 10-degree direction compared with the case that 3 narrow beams with the beam width of 10 degrees are transmitted in the 30-degree coverage range of the beam ID1, wherein the beam ID is 0 'to 2'.
11. The interfering base station transmits a RIM-RS at a narrower beam level.
12. And the interfered base station detects the RIM-RS and identifies a finer interference direction.
13. And the interfered base station informs the OMC to coordinate interference among all the beam directions. As an example, the OMC may inform the interfering base station to send null-steering beams in a narrower interfering beam direction (assuming the interfering beam is ID 1').
14. The interfering base station transmits beam ID 1' in the 10 null direction.
Based on the same inventive concept, the embodiment of the present invention further provides a base station, a cross timeslot interference processing apparatus, and a computer storage medium, and because the principle of solving the problem of these devices is similar to the cross timeslot interference processing method, the implementation of these devices may refer to the implementation of the method, and repeated details are not repeated.
When the technical scheme provided by the embodiment of the invention is implemented, the implementation can be carried out as follows.
Fig. 13 is a schematic diagram of a base station structure 1, as shown, the base station includes:
a processor 1300, for reading the program in the memory 1320, for executing the following processes:
when cross time slot interference is detected, determining an interference base station;
detecting the RIM-RS on corresponding uplink resources of downlink resources of RIM-RS sent by each interference base station, wherein each interference base station sends the RIM-RS on different resources;
determining the cell ID and the interference strength of an interference source according to the detected corresponding relation between the resource of the RIM-RS and an interference base station sending the RIM-RS;
a transceiver 1310 for receiving and transmitting data under the control of the processor 1300.
In the implementation, the RIM-RS is detected on the uplink resource corresponding to the last 2 symbol positions of the downlink resource of the interference base station.
In an implementation, the method further comprises the following steps:
and informing the OMC to perform interference coordination.
In the implementation, the interference base station is determined through the OMC; or the like, or, alternatively,
after sending RIM-RS, the disturbing base station is determined after being detected by the disturbing base station; or the like, or, alternatively,
and after the interfered base station sends the RIM-RS, the interfered base station is determined after being detected by other base stations.
In an implementation, the method further comprises the following steps:
and informing at least one interference source to transmit the RIM-RS in the beam direction.
In an implementation, the method further comprises the following steps:
and configuring the interference base station through the OMC to send the RIM-RS at the appointed time frequency resource position according to the beam direction with the angle smaller than the previous beam.
In an implementation, the method further comprises the following steps:
based on the detected location of the RIM-RS, the source of interference at the beam level is identified.
In an implementation, the method further comprises the following steps:
the OMC is informed to coordinate the interference between the various beam directions.
In the implementation, the OMC is informed to coordinate the interference between the beam directions, and the OMC informs the interference base station to send null-steering beams in the direction of the interference beams so as to coordinate the interference between the beam directions; or the like, or, alternatively,
the codebook of the interfering beam directions is restricted by using a codebook restriction subset mode to coordinate the interference among the beam directions; or the like, or, alternatively,
interference between the various beam directions is coordinated through spatial filtering.
In fig. 13, among other things, the bus architecture may include any number of interconnected buses and bridges, with one or more processors represented by processor 1300 and various circuits of memory represented by memory 1320 being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 1310 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium. The processor 1300 is responsible for managing the bus architecture and general processing, and the memory 1320 may store data used by the processor 1300 in performing operations.
The embodiment of the invention also provides a cross timeslot interference processing device, which comprises:
the interference applying determining module is used for determining an interference applying base station when the cross time slot interference is detected;
the device comprises a detection module, a sending module and a receiving module, wherein the detection module is used for detecting the RIM-RS on the corresponding uplink resource of the downlink resource of the RIM-RS sent by each interference base station, and each interference base station sends the RIM-RS on different resources;
and the interference determining module is used for determining the cell ID and the interference strength of the interference source according to the corresponding relation between the detected resources of the RIM-RS and the interference base station sending the RIM-RS.
The specific implementation can be seen in the implementation of the cross timeslot interference processing method on the interfered base station side.
For convenience of description, each part of the above-described apparatus is separately described as functionally divided into various modules or units. Of course, the functionality of the various modules or units may be implemented in the same one or more pieces of software or hardware in practicing the invention.
Fig. 14 is a schematic diagram of a base station structure 2, as shown, the base station includes:
the processor 1400 is used for reading the program in the memory 1420 and executing the following processes:
receiving an indication to transmit a RIM-RS;
sending RIM-RS on the appointed resource;
a transceiver 1410 for receiving and transmitting data under the control of the processor 1400.
In implementation, the RIM-RS is transmitted on the last 2 symbol positions of the downlink resource.
In an implementation, the method further comprises the following steps:
and carrying out interference coordination according to the notification of the OMC.
In the implementation, the indication of sending the RIM-RS is received, and the indication of receiving the OMC is received; or the like, or, alternatively,
is an indication to receive a disturbed base station.
In an implementation, the method further comprises the following steps:
receiving an indication to transmit a RIM-RS on a beam;
and transmitting the RIM-RS on the appointed beam resource.
In an implementation, the method further comprises the following steps:
receiving an indication to transmit a RIM-RS on a narrower beam, the narrower beam having an angle that is smaller than a previous beam;
the RIM-RS is transmitted on the agreed narrower beam resources.
In an implementation, the method further comprises the following steps:
and coordinating interference among all beam directions according to the notification of the OMC.
In the implementation, the interference between the beam directions is coordinated by transmitting a null notch beam in the direction of the interference beam to coordinate the interference between the beam directions; or the like, or, alternatively,
the codebook of the interfering beam directions is restricted by using a codebook restriction subset mode to coordinate the interference among the beam directions; or the like, or, alternatively,
interference between the various beam directions is coordinated through spatial filtering.
Where in fig. 14 the bus architecture may include any number of interconnected buses and bridges, one or more processors, represented by processor 1400, and the various circuits of memory, represented by memory 1420, are linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 1410 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium. The processor 1400 is responsible for managing the bus architecture and general processing, and the memory 1420 may store data used by the processor 1400 in performing operations.
The embodiment of the invention provides a cross time slot interference processing device, which comprises:
a receiving module, configured to receive an indication to send a RIM-RS;
and the sending module is used for sending the RIM-RS on the appointed resource.
The specific implementation can refer to the implementation of the cross timeslot interference processing method on the side of the interfering base station.
For convenience of description, each part of the above-described apparatus is separately described as functionally divided into various modules or units. Of course, the functionality of the various modules or units may be implemented in the same one or more pieces of software or hardware in practicing the invention.
An embodiment of the present invention provides a computer-readable storage medium, which stores a computer program for executing the above cross slot interference processing method.
The specific implementation may refer to implementation of the cross timeslot interference processing method at the victim base station side and/or the offender base station side.
In summary, in the technical solution provided in the embodiments of the present invention, for identifying an interference source in a cross timeslot, a two-stage interference identification scheme is introduced, that is, cell-level interference identification and beam-level interference identification.
The usage mode of the RIM-RS is expanded, and the method is used for cross time slot interference source identification between adjacent, close or far-spaced cells. And the interfered base stations identify interference sources according to the detected ID and interference strength of the RIM-RS, so as to realize cell-level interference identification.
And introducing a beam level RIM-RS, carrying out interference beam direction identification (if the beam direction is identified, the interference can be eliminated through null/codebook subset limitation of multi-antenna transmission or a receiving filter mechanism) by transmitting different beams of the interference base station RIM-RS, and realizing the interference identification at the beam level.
For cross slot interference, a two-stage back-off scheme is introduced, namely a cell-level scheme and a beam-level scheme, wherein the cell-level scheme can be power back-off, downlink symbol back-off and the like, and the beam-level scheme can be a fine interference back-off mode such as beam null, codebook subset restriction, spatial filtering and the like.
Therefore, compared with a scheme without interference source identification, the scheme can identify the interference source, and only the interference source is needed to implement an interference back-off scheme, so that the system overhead is reduced, and the system performance is improved;
compared with the existing interference source identification scheme, the scheme can be used for identifying the interference sources among cells which are far away from each other on one hand, and can be used for accurately identifying the interference sources on the other hand, so that a fine interference back-off scheme is implemented aiming at the interference sources, the system overhead is reduced, and the system performance is improved;
compared with the existing interference identification technology, the scheme uses the RIM-RS to identify the cell-level and beam-level multi-level interference sources, can identify the beam direction and even the extremely narrow beam direction, and therefore has better performance.
On the basis of the interference identification technology of the scheme, the interference avoidance scheme with different precisions of a cell level and a beam level is adopted, so that the interference avoidance can be implemented more flexibly and more accurately, and the performance is better.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.
Claims (37)
1. A method for cross-slot interference processing, comprising:
when the interfered base station detects the cross time slot interference, determining an interference base station;
the interfered base station detects the channel state information reference signal RIM-RS on the corresponding uplink resource of the downlink resource of the RIM-RS sent by each interfered base station, wherein each interfered base station sends the RIM-RS on different resources;
and determining the cell identification ID and the interference strength of the interference source according to the detected corresponding relation between the resource of the RIM-RS and the interference base station sending the RIM-RS.
2. The method of claim 1, wherein the victim base station detects the RIM-RS on uplink resources corresponding to the last 2 symbol positions of the downlink resources of the aggressor base station.
3. The method of claim 1, further comprising:
and the disturbed base station informs the operation management center OMC to carry out interference coordination.
4. The method of claim 1, wherein determining the offending base station is determined by OMC; or the like, or, alternatively,
after sending RIM-RS, the disturbing base station is determined after being detected by the disturbing base station; or the like, or, alternatively,
and after the interfered base station sends the RIM-RS, the interfered base station is determined after being detected by other base stations.
5. The method of any of claims 1 to 4, further comprising:
and the interfered base station informs at least one interference source to transmit the RIM-RS in the beam direction.
6. The method of claim 5, further comprising:
and the interfered base station configures the interference base station to transmit RIM-RS in the appointed time frequency resource position according to the beam direction with the angle smaller than the previous beam through the OMC.
7. The method of claim 5 or 6, further comprising:
and the interfered base station identifies the interference source at the beam level according to the detected position of the RIM-RS.
8. The method of claim 7, further comprising:
and the interfered base station informs the OMC to coordinate interference among all the beam directions.
9. The method of claim 8, wherein the victim base station informs the OMC to coordinate interference between the respective beam directions by informing the aggressor base station through the OMC to transmit null beams in the direction of the interfering beams to coordinate interference between the respective beam directions; or the like, or, alternatively,
the codebook of the interfering beam directions is restricted by using a codebook restriction subset mode to coordinate the interference among the beam directions; or the like, or, alternatively,
interference between the various beam directions is coordinated through spatial filtering.
10. A method for cross-slot interference processing, comprising:
the base station receives an indication of sending the RIM-RS;
and the base station transmits the RIM-RS on the appointed resources.
11. The method of claim 10, wherein the base station transmits the RIM-RS at the last 2 symbol positions of the downlink resource.
12. The method of claim 10, further comprising:
and the base station performs interference coordination according to the notification of the OMC.
13. The method of claim 10, wherein the base station receives the indication to transmit the RIM-RS as an indication to receive the OMC; or the like, or, alternatively,
is an indication to receive a disturbed base station.
14. The method of any of claims 10 to 13, further comprising:
the base station receives an indication to transmit the RIM-RS on the beam;
and the base station transmits the RIM-RS on the appointed beam resource.
15. The method of claim 14, further comprising:
the base station receiving an indication to transmit a RIM-RS on a narrower beam, the narrower beam having an angle that is smaller than a previous beam;
the base station transmits the RIM-RS on the agreed narrower beam resources.
16. The method of claim 15, further comprising:
and the base station coordinates the interference among all the wave beam directions according to the notification of the OMC.
17. The method of claim 16, wherein the base station coordinates interference between the respective beam directions by transmitting null beams in the direction of the interfering beam to coordinate interference between the respective beam directions; or the like, or, alternatively,
the codebook of the interfering beam directions is restricted by using a codebook restriction subset mode to coordinate the interference among the beam directions; or the like, or, alternatively,
interference between the various beam directions is coordinated through spatial filtering.
18. A base station, comprising:
a processor for reading the program in the memory, performing the following processes:
when cross time slot interference is detected, determining an interference base station;
detecting the RIM-RS on corresponding uplink resources of downlink resources of RIM-RS sent by each interference base station, wherein each interference base station sends the RIM-RS on different resources;
determining the cell ID and the interference strength of an interference source according to the detected corresponding relation between the resource of the RIM-RS and an interference base station sending the RIM-RS;
a transceiver for receiving and transmitting data under the control of the processor.
19. The base station of claim 18, wherein the RIM-RS is detected on uplink resources corresponding to the last 2 symbol positions of the interfering base station downlink resources.
20. The base station of claim 18, further comprising:
and informing the OMC to perform interference coordination.
21. The base station of claim 18, wherein determining the offending base station is determined by OMC; or the like, or, alternatively,
after sending RIM-RS, the disturbing base station is determined after being detected by the disturbing base station; or the like, or, alternatively,
and after the interfered base station sends the RIM-RS, the interfered base station is determined after being detected by other base stations.
22. The base station of any of claims 18 to 21, further comprising:
and informing at least one interference source to transmit the RIM-RS in the beam direction.
23. The base station of claim 22, further comprising:
and configuring the interference base station through the OMC to send the RIM-RS at the appointed time frequency resource position according to the beam direction with the angle smaller than the previous beam.
24. The base station of claim 22 or 23, further comprising:
based on the detected location of the RIM-RS, the source of interference at the beam level is identified.
25. The base station of claim 24, further comprising:
the OMC is informed to coordinate the interference between the various beam directions.
26. The base station of claim 25, wherein the OMC is informed to coordinate interference between the respective beam directions by informing the interfering base station to transmit null-steering beams in the direction of the interfering beams to coordinate interference between the respective beam directions; or the like, or, alternatively,
the codebook of the interfering beam directions is restricted by using a codebook restriction subset mode to coordinate the interference among the beam directions; or the like, or, alternatively,
interference between the various beam directions is coordinated through spatial filtering.
27. A cross-slot interference processing apparatus, comprising:
the interference applying determining module is used for determining an interference applying base station when the cross time slot interference is detected;
the device comprises a detection module, a sending module and a receiving module, wherein the detection module is used for detecting the RIM-RS on the corresponding uplink resource of the downlink resource of the RIM-RS sent by each interference base station, and each interference base station sends the RIM-RS on different resources;
and the interference determining module is used for determining the cell ID and the interference strength of the interference source according to the detected corresponding relation between the resource of the RIM-RS and the interference base station which sends the RIM-RS.
28. A base station, comprising:
a processor for reading the program in the memory, performing the following processes:
receiving an indication to transmit a RIM-RS;
sending RIM-RS on the appointed resource;
a transceiver for receiving and transmitting data under the control of the processor.
29. The base station of claim 28, wherein the RIM-RS is transmitted at the last 2 symbol positions of the downlink resource.
30. The base station of claim 28, further comprising:
and carrying out interference coordination according to the notification of the OMC.
31. The base station of claim 28, wherein receiving the indication to transmit the RIM-RS is receiving an indication of the OMC; or the like, or, alternatively,
is an indication to receive a disturbed base station.
32. The base station of any of claims 28 to 31, further comprising:
receiving an indication to transmit a RIM-RS on a beam;
and transmitting the RIM-RS on the appointed beam resource.
33. The base station of claim 32, further comprising:
receiving an indication to transmit a RIM-RS on a narrower beam, the narrower beam having an angle that is smaller than a previous beam;
the RIM-RS is transmitted on the agreed narrower beam resources.
34. The base station of claim 33, further comprising:
and coordinating interference among all beam directions according to the notification of the OMC.
35. The base station of claim 34, wherein interference between the respective beam directions is coordinated by transmitting null beams in the direction of the interfering beam to coordinate interference between the respective beam directions; or the like, or, alternatively,
the codebook of the interfering beam directions is restricted by using a codebook restriction subset mode to coordinate the interference among the beam directions; or the like, or, alternatively,
interference between the various beam directions is coordinated through spatial filtering.
36. A cross-slot interference processing apparatus, comprising:
a receiving module, configured to receive an indication to send a RIM-RS;
and the sending module is used for sending the RIM-RS on the appointed resource.
37. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program for executing the method of any one of claims 1 to 17.
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