CN113852441B - 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: before the interfered base station sends an uplink signal, judging whether the special time slot or the uplink time slot is a cross time slot according to the time slot ratio of the interfered base station to the interfered base station, wherein the Shi Rao base station and the interfered base station are adjacent and/or close base stations; and when the interfered base station determines that the special time slot or the uplink time slot is a cross time slot, the interfered base station sends a far-end interference management reference signal to the interfering base station. Shi Rao base station, upon detecting a remote interference management reference signal, performs interference back-off and/or mitigation on a downlink slot corresponding to a victim base station's special slot uplink symbol and/or uplink slot. By adopting the invention, the cross time slot interference can be avoided/eliminated, thus the performance is better.
Description
Technical Field
The present invention relates to the field of wireless communications technologies, and in particular, to a method, a base station, a device, and a medium for processing cross timeslot interference.
Background
In a mobile communication system, for a TDD (Time Division Duplex) system, if frame structures of adjacent cells are not consistent or sub-carrier intervals of two cells are not consistent, cross slot interference may be generated, and when there is a same frequency between adjacent cells, the interference intensity may be large and unacceptable. On the other hand, if the frame structure of the TDD system is consistent, although interference can be avoided, the resource utilization rate of the static configuration is limited under the condition that the user service is continuously changed. The resource utilization rate can be improved by adopting dynamic time slot scheduling, and the problem of cross time slot interference needs to be solved by the dynamic time slot scheduling.
Fig. 1 is a schematic diagram of a network environment generating cross timeslot interference, fig. 2 is a schematic diagram of a timeslot generating cross timeslot interference, and taking a 5G NR (New Radio) TDD mobile communication system as an example, when dynamic timeslot scheduling is used, when different transmission directions may exist in some timeslots in two base stations illustrated in fig. 1, interference as shown in fig. 2 may be generated.
For the interference problem of dynamic time slot scheduling, there are mainly schemes such as interference suppression and interference coordination.
For interference suppression, advanced detection algorithms like NAICS are mainly used by advanced receiver schemes, and currently, the minimum mean square error receiver is widely used. Fig. 3 is a schematic diagram of a minimum mean square error receiver framework, as shown in the figure, on the side of a disturbed base station, through detecting an interference signal of an interfering base station, the interference signal of the interfering base station is cancelled at a receiver, and the reception performance of a useful signal is ensured. This scheme requires designing an appropriate reference signal to maintain sufficiently accurate channel estimation, and usually requires designing an orthogonal DMRS (demodulation reference signal) signal with uplink and downlink symmetry.
For interference coordination, methods such as power control, beam control and high-level scheduling are adopted based on inter-cell interference measurement to weaken interference. This approach relies on interference measurements and information exchange between base stations. Fig. 4 is a schematic diagram of an interference coordination scheme, as shown in the figure:
1) The base station 1 measures a signal of the neighboring base station 2 using a CSI-RS (channel state information reference signal) on the resource 3;
2) An uplink User UE (User Equipment) 1 of the base station 1 reserves a resource 3 as a blank resource, and does not perform uplink transmission on the blank resource;
3) Meanwhile, the base station 2 configures a zero-power reference signal (ZP CSI-RS) on the resource 3, so that the measurement result of the base station 1 on the resource 3 is the cross time slot interference caused by the downlink of the base station 2 to the uplink of the base station 1;
4) The base station 1 interacts the measurement result with the base station 2 through an Xn interface;
5) The base station 2 implements an interference back-off and/or mitigation scheme based on the mutual information.
For the existing solutions, the advanced receiver solution is very complex to implement and needs to adopt a SIC-like (successive interference back-off and/or mitigation) manner. In addition, because the reference signal formats of the uplink and downlink time slots are not consistent, the downlink interference signal may exceed the time slot boundary and other influences, which all affect the actual effect of the advanced receiver. Therefore, this approach only stays in the theoretical analysis stage.
For the interference coordination scheme, firstly, depending on interference measurement, for the 5G NR wireless communication system, the current mainstream scheme is to adopt CSI-RS for interference measurement between base stations. However, the use of CSI-RS for interference measurement belongs to a new function of the base station, and requires development work of a new base station, and on the other hand, transmission of CSI-RS between base stations may exceed a time slot boundary (especially in a multi-cell situation), which may affect measurement performance. At present, there is a related scheme that proposes to adjust the existing slot structure to achieve slot alignment, but this adjustment scheme is not supported by the current 3GPP standard.
In summary, the prior art has the following disadvantages: there is no truly viable solution to the problem of cross-slot interference.
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 solving the problem of cross time slot interference so as to realize dynamic time slot scheduling.
The invention provides the following technical scheme:
a cross-slot interference processing method comprises the following steps:
before the interfered base station sends an uplink signal, judging whether the special time slot or the uplink time slot is a cross time slot according to the time slot ratio of the interfered base station to the interfered base station, wherein the Shi Rao base station and the interfered base station are adjacent and/or close base stations;
and when the interfered base station determines that the special time slot or the uplink time slot is the crossed time slot, the interfered base station sends an RIM-RS signal to the Shi Raoji station.
In an implementation, the method further comprises the following steps:
and the sending period of the RIM-RS is configured through an operation maintenance system (OAM).
In an implementation, the method further comprises the following steps:
after sending out RIM-RS, the interfered base station does not judge the cross time slot in the period.
In an implementation, the method further comprises the following steps:
and after the RIM-RS sending period is finished, the interfered base station recovers the judgment of the cross time slot.
In an implementation, the method further comprises the following steps:
and the interfered base station informs the interference base station of the backoff parameters through the RIM-RS.
In implementation, the victim base station informs the aggressor base station of the backoff parameter through the RIM-RS, wherein the backoff parameter is one of the following parameters or a combination of the following parameters: frequency of backoff, transmission time, and transmission power.
In an implementation, the method further comprises the following steps:
and the interfered base station sends RIM-RS on the corresponding uplink symbols according to the far-end interference avoiding measure rule adopted by the Shi Raoji station and the number of expected symbols backed by the interfering base station.
In an implementation, the method further comprises the following steps:
and the interfered base station configures a RIM-RS sequence group, and sends different RIM-RS sequences according to the number of expected symbols backed off by the interference base station, wherein the sending information of each RIM-RS sequence bears different numbers of symbols backed off by the interference base station.
A cross-slot interference processing method comprises the following steps:
shi Rao base station detects RIM-RS signals transmitted by a victim base station, wherein Shi Rao base station is adjacent and/or near base station to the victim base station;
shi Raoji station, upon detecting a RIM-RS signal, performs interference back-off and/or mitigation on downlink slots corresponding to victim base station special slot uplink symbols and/or uplink slots.
In an implementation, the method further comprises the following steps:
shi Raoji station determines the backoff parameters notified by the victim base station via the RIM-RS.
In implementation, the Shi Raoji station determines the backoff parameter notified by the interfered base station through the RIM-RS, and determines the backoff parameter notified by the interfered base station and including one or a combination of the following parameters through one or a combination of the ID, the transmission frequency and the transmission time of the RIM-RS: frequency of backoff, transmission time, and transmission power.
In an implementation, the method further comprises the following steps:
and the interference-exerting base station carries out interference back-off and/or mitigation according to the number of the received symbols corresponding to the RIM-RS uplink symbols by the measures of remote interference management.
In an implementation, the method further comprises the following steps:
shi Rao base station performs backoff according to the number of symbols corresponding to the received RIM-RS sequence, where the transmission information of different RIM-RS sequences carries the number of symbols that different interfered base stations expect to backoff.
A base station, comprising:
a processor for reading the program in the memory, performing the following processes:
as a disturbed base station, before sending an uplink signal, judging whether the special time slot or the uplink time slot is a cross time slot according to the time slot ratio of the disturbed base station to the interfered base station, wherein the Shi Rao base station and the disturbed base station are adjacent and/or similar base stations;
when the special time slot or the uplink time slot is determined to be the cross time slot, sending an RIM-RS signal to a Shi Raoji station;
a transceiver for receiving and transmitting data under the control of the processor.
In an implementation, the method further comprises the following steps:
and the sending period of the RIM-RS is configured through an operation maintenance system (OAM).
In an implementation, the method further comprises the following steps:
after sending out RIM-RS, in this period, no cross time slot judgment is made.
In an implementation, the method further comprises the following steps:
and after the RIM-RS sending period is finished, the judgment of the cross time slot is recovered.
In an implementation, the method further comprises the following steps:
and informing the interference base station of the backoff parameters through the RIM-RS.
In the implementation, the RIM-RS informs the interference base station of the backoff parameters, which is one or a combination of the ID, the transmission frequency and the transmission time of the RIM-RS, and the backoff parameters informing the interference base station of one or a combination of the following parameters are included: backoff frequency, transmission time, and transmission power.
In an implementation, the method further comprises the following steps:
and sending RIM-RS on corresponding uplink symbols according to a far-end interference avoidance measure rule adopted by a Shi Raoji station and the number of expected symbols backed off by the interference base station.
In an implementation, the method further comprises the following steps:
and configuring an RIM-RS sequence group, and sending different RIM-RS sequences according to the number of symbols expected to be backed off by the interference base station, wherein the sending information of each RIM-RS sequence carries the number of symbols expected to be backed off by the interference base station.
A base station, comprising:
a processor for reading the program in the memory and executing the following processes:
detecting an RIM-RS signal sent by a disturbed base station as an interfering base station, wherein the Shi Rao base station and the disturbed base station are adjacent and/or similar base stations;
after the RIM-RS signal is detected, interference backoff and/or mitigation is adopted on a downlink time slot corresponding to a special time slot uplink symbol and/or an uplink time slot of a disturbed base station;
a transceiver for receiving and transmitting data under the control of the processor.
In an implementation, the method further comprises the following steps:
and determining the backoff parameters notified by the interfered base station through the RIM-RS to adopt interference backoff and/or slow down.
In implementation, the backoff parameter notified by the interfered base station is determined by the RIM-RS, and is determined by one or a combination of an ID, a transmission frequency and a transmission time of the RIM-RS, and the backoff parameter notified by the interfered base station includes one or a combination of the following parameters: frequency of backoff, transmission time, and transmission power.
In an implementation, the method further comprises the following steps:
and performing interference back-off and/or mitigation according to the number of the symbols corresponding to the received RIM-RS uplink symbols by the remote interference management measure.
In an implementation, the method further comprises the following steps:
and performing backoff according to the number of symbols corresponding to the received RIM-RS sequences, wherein the transmission information of different RIM-RS sequences bears the number of symbols which are expected to be backed off by the interference base station by different interfered base stations.
A cross-slot interference processing apparatus, located in a victim base station, comprising:
the judging module is used for judging whether the special time slot or the uplink time slot is a cross time slot or not according to the time slot ratio of the judging module and the interference base station before sending the uplink signal, wherein the Shi Rao base station and the interference base station are adjacent and/or close base stations;
and the sending module is used for sending RIM-RS signals to the Shi Raoji station when the special time slot or the uplink time slot is determined to be the crossed time slot.
A cross-slot interference processing device located at Shi Raoji station, comprising:
the device comprises a detection module, a processing module and a processing module, wherein the detection module is used for detecting an RIM-RS signal sent by a disturbed base station, and a Shi Rao base station and the disturbed base station are adjacent and/or close base stations;
and the interference back-off and/or mitigation module is used for taking interference back-off and/or mitigation on a downlink time slot corresponding to the uplink symbol and/or the uplink time slot of the special time slot of the interfered base station after the RIM-RS signal is detected.
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, the RIM-RS is used for dynamic time slot scheduling of the adjacent cells; the interfered base station informs the interfering base station to carry out corresponding transmission backoff of the transmission time slot through the transmission of the RIM-RS; cross-slot interference can thus be avoided/eliminated and hence better performance, relative to existing interference back-off and/or mitigation techniques.
Furthermore, it is easy to see that, the scheme can at least have one of the following effects:
compared with the mode of an advanced receiver, the scheme is simple to realize and has better realizability;
compared with the interference measurement by using the CSI-RS, the implementation of the base station is changed less:
from the standard angle, the base station does not support the use of CSI-RS for interference measurement, a new measurement algorithm is needed, the RIM-RS is a base station function defined by the standard, and the base station has the measurement function of the RIM-RS;
the CSI-RS transmissions between base stations may exceed the slot boundaries (especially in multi-cell scenarios), which may have an impact on measurement performance. The RIM-RS takes the problem of cross-time slot into consideration during design, and the RIM-RS is designed to be a repeated design with two symbol lengths, so that the problem of cross-time slot transmission between base stations can be avoided;
the use of the RIM-RS requires the base station to add a function of transmitting the RIM-RS in an uplink time slot, but is easier to realize compared with the base station detection function of newly adding the CSI-RS.
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 a network environment generating cross-slot interference in the prior art;
FIG. 2 is a schematic diagram of a cross slot interference in the prior art;
FIG. 3 is a block diagram of a prior art minimum mean square error receiver;
fig. 4 is a diagram illustrating an interference coordination scheme in the background art;
FIG. 5 is a diagram illustrating an example of a configuration of RIM-RS in the interference of remote terminals according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a remote interference management implementation framework according to an embodiment of the present invention;
FIG. 7 is a diagram illustrating an exemplary implementation environment for cross-slot interference handling according to an embodiment of the present invention;
fig. 8 is a schematic flow chart of an implementation of a cross timeslot interference processing method at the interfered base station side in the embodiment of the present invention;
fig. 9 is a schematic flow chart of an implementation of a cross timeslot interference processing method at the interfering base station side in the embodiment of the present invention;
FIG. 10 is a diagram illustrating an embodiment of RIM-RS configuration in cross-slot interference;
FIG. 11 is a schematic diagram of dynamic timeslot scheduling based on RIM-RS according to an embodiment of the present invention;
FIG. 12 is a block diagram of a base station according to an embodiment of the present invention;
fig. 13 is a schematic structural diagram of a base station ii in the embodiment of the present invention.
Detailed Description
The inventor notices in the process of invention that:
in order to solve the problem of Remote Interference between base stations of the TDD system, a Reference Signal RIM-RS (Remote Interference Management Reference Signal) is used in some schemes. Fig. 5 is a schematic diagram of RIM-RS configuration in far-end interference, as shown in the figure, when a base station generates far-end interference (an interference signal may propagate hundreds of kilometers through an atmospheric waveguide effect, so that a base station outside hundreds of kilometers forms interference on a local base station), a downlink symbol position of a disturbed base station before GP (Guard Period) (a specific symbol position is configured through a network, and after a far-end interference management function is started, a Shi Raoji station and the disturbed base station both obtain configuration information) sends a RIM-RS, a Shi Rao base station detects a RIM-RS at an Uplink symbol and a UL (Uplink) time slot of an S time slot, and a Shi Raoji station can know how many Uplink symbols are interfered according to the detected position of the RIM-RS, so as to know how many downlink symbols are correspondingly backed off.
The remote interference management procedure is explained below.
Fig. 6 is a schematic diagram of a remote interference management implementation framework, in which the processing flow is as follows:
step 0: atmospheric waveguiding phenomena occur and far end interference occurs.
Step 1：
The victim base station suffers from "grade" interference and initiates RIM-RS transmission/monitoring.
This reference signal, denoted RS-1, assists the aggressor base station in identifying: the method generates far-end interference to an affected base station and detects how much uplink resource is affected to the affected base station.
When configured as OAM or subject to "ramp-like" interference increases, the aggressor base station begins monitoring the RS.
Step 2: upon receiving RS-1, the aggressor base station starts a far-end interference back-off and/or mitigation scheme, e.g., reducing partial downlink transmission symbol transmissions, and sends an RS to the victim base station, informing the victim base station whether the atmospheric waveguide phenomenon is still present.
And assisting the victim base station to judge whether the RS of the remote interference phenomenon still exists is recorded as RS-2.
Other uses of RS-2 are not excluded.
Step 3: if the victim base station detects the RS-2, the victim base station continues to send the RS-1; the victim base station may stop transmitting RS-1 if the victim base station does not detect RS-2 or the network interference returns to a certain level.
Step 4: if the aggressive base station still receives the RS-1, continuing the remote interference backoff and/or the mitigation scheme until the RS-1 disappears; and the aggressive base station restores the original configuration after detecting that the RS-1 disappears.
The introduction of RIM-RS is to solve the remote interference management problem, but the inventors note that RIM-RS can be used for dynamic slot scheduling of neighboring cells. Based on this, the embodiment of the present invention provides a scheme for performing dynamic timeslot scheduling by using RIM-RS.
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 interfered 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 in cooperation or separately, and actually, when the interfering base station and the interfered base station are implemented separately, the interfering base station or the interfered base station may perform the cross time slot judgment respectively, and if the interfering base station and the interfered base station are in the cross time slot, the downlink or uplink backoff and/or mitigation is selected, and the problem on one side of the interfering base station or the interfered base station is also solved respectively, and when the interfering base station and the interfered base station are used in combination, a better technical effect is obtained.
Fig. 7 is a schematic diagram of an implementation environment of cross timeslot interference processing, as shown in the figure, the diagram includes an interfering base station and a victim base station, and terminals respectively performing uplink and downlink transmission.
Fig. 8 is a schematic flowchart of an implementation of a method for processing cross timeslot interference at an interfered base station, as shown in the figure, the method may include:
step 802, when the interfered base station determines that the special time slot or the uplink time slot is the cross time slot, the interfered base station sends an RIM-RS signal to the Shi Raoji station.
In the implementation, to reduce the loss, it may be determined whether the uplink signal needs to be transmitted as a cross slot.
Fig. 9 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:
Specifically, because dynamic slot scheduling occurs between neighboring base stations, the victim base station must send the RIM-RS at the uplink symbol position, and the Shi Rao base station can detect the RIM-RS in both the S and UL slots. Compared with far-end interference, because the Shi Rao base station backoff needs to solve the cross slot interference, for dynamic slot scheduling, the interfering base station does not know how many symbols need to backoff for cross slot scheduling. The following scheme gives at least two possible solutions:
1. the first way.
And the interfered base station sends the symbols on the corresponding uplink symbols according to the expected number of symbols for the interference base station to back off, so that the interference base station adopts the same avoidance measures as the far-end interference in order to take the far-end interference.
In an implementation, for the disturbed base station, the method may further include:
and the interfered base station sends RIM-RS on the corresponding uplink symbols according to the far-end interference avoiding measure rule adopted by the Shi Raoji station and the number of expected symbols backed by the interfering base station.
For the Shi Raoji station, may further comprise:
and the interference base station carries out interference back-off and/or mitigation according to the number of the symbols corresponding to the received RIM-RS uplink symbols by the measure of remote interference management.
Specifically, the interfered base station sends the symbols on corresponding uplink symbols according to the number of expected symbols for backoff of the interfering base station, so that the interfering base station takes a similar avoidance measure to the far-end interference in order to generate the far-end interference, and the interference backoff and/or mitigation mode is similar to the remote interference management measure. When determining the number of symbols to be backed off and/or slowed down, for example, as a feasible way, the number of symbols to be backed off and/or slowed down is the number of symbols from the initial receiving position of the RIM-RS to the last downlink symbol in the uplink and downlink switching period.
Fig. 10 is a schematic diagram of RIM-RS configuration in cross slot interference, as shown in the figure, the special slot symbol ratio is 10:2:2, the number of symbols with cross slot interference is 14, so the interfered base station expects the interfering base station to back off 14 downlink symbols, and the interfered base station should transmit RIM-RS on the 11 th to 12 th symbols of the second uplink slot (it is assumed here that in the configuration related to far-end interference, the transmission position of RIM-RS is configured as the last two downlink symbols of the special slot, i.e. the 9 th and 10 th symbols).
Specifically, the "corresponding uplink symbol" here may refer to fig. 1 and fig. 10, and assuming that there is uplink signal transmission in both the special slot and the uplink slot in fig. 1, it is expected that the interfering base station backs off by 14 symbols, so that the interfering base station needs to receive the RIM-RS at a position spaced by 14 symbols from the special slot GP. Since the distance between the interfered base station and the Shi Raoji station is short, it can be considered that the receiving position of the interfering base station is the same as the transmitting position of the interfered base station, and therefore the interfered base station needs to transmit the RIM-RS at the uplink symbol position shown in fig. 10. Here, the sending RIM-RS position is closely related to the frame structure of the interfering base station and the interfered base station, and fig. 10 assumes that the interfered base station and the interfering base station are both SCS (sub-carrier space) =30kHz, and the special timeslot ratio is 10.
In this way, the disturbing base station does not need to be changed and has private convention, and is at least suitable for the base stations of different manufacturers.
2. The second way.
And the interfered base station configures a RIM-RS sequence group, and sends different RIM-RS sequences according to the number of expected symbols backed off by the interference base station, wherein the sending information of each RIM-RS sequence bears different numbers of symbols backed off by the interference base station.
In an implementation, for the disturbed base station, the method may further include:
and the interfered base station configures a RIM-RS sequence group, and sends different RIM-RS sequences according to the number of expected symbols backed off by the interference base station, wherein the sending information of each RIM-RS sequence bears different numbers of symbols backed off by the interference base station.
In practice, for the Shi Raoji station, it may further comprise: shi Rao base station performs backoff according to the number of symbols corresponding to the received RIM-RS sequence, where the transmission information of different RIM-RS sequences carries the number of symbols that different interfered base stations expect to backoff.
Specifically, the transmission information of the RIM-RS carries the number of backoff symbols that are desired to interfere with the base station.
As an example, the first three symbols of the UL slot at the gNB1 (NR node) are configured as the transmission time of the RIM-RS. And configuring a RIM-RS sequence group, for example, configuring 4 RIM-RSs, wherein IDs are 0-3, different IDs correspond to different RIM-RS sequences, and the number of backoff symbols of each RIM-RS corresponding to a base station which is expected to be interfered is 7, 14, 21 and 28.
Specifically, one RIM-RS sequence may be identified by one RIM-RS ID, and the sequence group mentioned herein is intended to illustrate that a victim base station may statically configure a plurality of RIM-RS sequences, and send different sequences according to different interference situations.
In this way, the interference base station transmits the RIM-RS at a fixed position, the interference base station can detect at the fixed position, the detection is easier to realize, and the interference base station can be suitable for the base stations of the same manufacturer only by forming convention among the base stations.
The overall flow chart is as follows:
fig. 11 is a schematic diagram of dynamic slot scheduling based on RIM-RS, which is illustrated separately from a victim base station and an aggressor base station. Firstly, on the disturbed base station side:
And step 2, if the interfered base station determines that the special time slot or the uplink time slot is a crossed time slot (the time slot shown in the circle of the figure 1), transmitting an RIM-RS signal to the Shi Raoji station.
And 3, in order to reduce signaling overhead, configuring an RIM-RS sending period (such as 200 ms) for the interfered base station through an OM (operation Manager) through OAM (operation administration), and after the interfered base station sends the RIM-RS, in the period, no cross time slot judgment is performed any more, so that the RIM-RS only needs to be sent once in the period.
And 4, after one scheduling period is finished, the interfered base station recovers the judgment of the cross time slot.
That is, in the implementation, the method may further include:
and the sending period of the RIM-RS is configured through an operation maintenance system (OAM).
In specific implementation, the method may further include:
after sending out RIM-RS, the interfered base station does not judge the cross time slot in the period.
Specifically, to save signaling overhead, the RIM-RS may be transmitted only once in a period, which is an integer multiple of 10ms of a radio frame. For example, as shown in fig. 1, if the uplink symbol and the first uplink slot in a special timeslot are both cross slots, then according to an expected backoff symbol, sending RIM-RS on the 11 th and 12 th symbols of the last uplink slot (as shown in fig. 10), then in this period, the victim station does not judge and does not send RIM-RS any more, the default cross slot interference exists, and the aggressor station also considers that interference in this period exists all the time and takes a backoff measure all the time. This saves signaling overhead of the RIM-RS.
In specific implementation, the method may further include:
and after the RIM-RS sending period is finished, the interfered base station recovers the judgment of the cross time slot.
On the interfering base station side:
The scheme can avoid the generation of cross time slot interference, and the interfered base station transmits the RIM-RS based on the cross time slot judgment. In the actual processing, interference does not necessarily occur on the crossed time slot, or the interference strength is within a controllable range, so the evasive measures of the interfering base station are not significant, and capacity loss or coverage loss is caused.
An alternative is for the victim base station to transmit the RIM-RS based on interference detection. Interference detection is carried out on a cross time slot for uplink transmission by a disturbed base station, if the interference detected by the disturbed base station is higher than a preset threshold value, the interference is considered to be unacceptable, RIM-RS is sent to the Shi Raoji station, the cross time slot interference threshold value at least can refer to a table in section 7.2 of 3GPP TS 38.104, for example, when a subcarrier interval is 30kHz, the maximum acceptable interference level value of an indoor micro station under 20MHz system bandwidth is-87.6 dBm, a specific value can be properly adjusted according to networking scenes and the like, and the specific value can be determined through simulation and engineering experience.
In the implementation, the method can further comprise the following steps:
and the interfered base station informs the interference base station of the backoff parameters through the RIM-RS.
In specific implementation, the interfered base station notifies the interfering base station of the backoff parameter through the RIM-RS, wherein the backoff parameter notifies the interfering base station to include one or a combination of the following parameters through one or a combination of an ID, a transmission frequency and a transmission time of the RIM-RS: frequency of backoff, transmission time, and transmission power.
Correspondingly, on the disturbance base station side, the method may further include:
shi Raoji station determines the backoff parameters notified by the interfered base station by the RIM-RS to take interference backoff and/or slow down.
In a specific implementation, the Shi Raoji station determines the backoff parameter notified by the interfered base station through the RIM-RS, and determines the backoff parameter notified by the interfered base station and including one of the following parameters or a combination thereof through one of the ID, the transmission frequency, and the transmission time of the RIM-RS, or a combination thereof: frequency of backoff, transmission time, and transmission power.
Specifically, the RIM-RS may contain more information, such as frequency domain information, interference strength, interference source, and the like. It is therefore also possible to:
1. the interfered base station can transmit RIM-RS in a specified frequency range, for example, 20M bandwidth in 100M bandwidth of a 5G NR wireless communication system, and after detection of the base station Shi Rao, the base station only performs transmission avoidance on the corresponding frequency. Based on this point, the scheme can also be applied to interference detection and elimination in dynamic spectrum sharing.
2. The Shi Raoji station can determine the interference strength between base stations according to the detection of the RIM-RS, and further perform power control and determine the power of a transmission signal.
3. Although the above scheme takes two base stations as an example, the scheme can be easily popularized to multi-cell use. For example, when there are multiple interference sources in the interfered base station, the Shi Raoji station may use the same transmission/detection mechanism as described above to determine whether it is an interference source according to the time, frequency, and code information of the RIM-RS, and if so, adopt an interference back-off and/or mitigation scheme.
In the implementation, the detection and interference power measurement of the RIM-RS can be implemented according to the prior art, and the scheme is not described again.
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 readable 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. 12 is a schematic structural diagram of a base station, as shown, the base station includes:
a processor 1200 for reading the program in the memory 1220 and executing the following processes:
as a disturbed base station, before sending an uplink signal, judging whether the special time slot or the uplink time slot is a cross time slot according to the time slot ratio of the disturbed base station and the self, wherein the Shi Rao base station and the disturbed base station are adjacent and/or close base stations;
when the special time slot or the uplink time slot is determined to be the cross time slot, sending an RIM-RS signal to a Shi Raoji station;
a transceiver 1210 for receiving and transmitting data under the control of the processor 1200.
In an implementation, the method further comprises the following steps:
and the sending period of the RIM-RS is configured through an operation maintenance system (OAM).
In an implementation, the method further comprises the following steps:
after sending out RIM-RS, in this period, no cross time slot judgment is made.
In an implementation, the method further comprises the following steps:
and after the RIM-RS sending period is finished, the judgment of the cross time slot is recovered.
In an implementation, the method further comprises the following steps:
and informing the interference base station of the backoff parameters through the RIM-RS.
In the implementation, the backoff parameters are notified to the interfering base station through the RIM-RS, and are one or a combination of the ID, the transmission frequency and the transmission time of the RIM-RS, and the backoff parameters include one or a combination of the following parameters: frequency of backoff, transmission time, and transmission power.
In an implementation, the method further comprises the following steps:
and according to a far-end interference avoidance measure rule adopted by a Shi Raoji station, sending RIM-RS on a corresponding uplink symbol according to the number of expected symbols backed by an interference applying base station.
In an implementation, the method further comprises the following steps:
and configuring a RIM-RS sequence group, and sending different RIM-RS sequences according to the number of the symbols expected to be backed off by the interference base station, wherein the sending information of each RIM-RS sequence bears different numbers of the symbols expected to be backed off by the interference base station.
Where, in fig. 12, the bus architecture may include any number of interconnected buses and bridges, in particular one or more processors, represented by processor 1200, and various circuits, represented by memory 1220, 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 1210 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 1200 is responsible for managing the bus architecture and general processing, and the memory 1220 may store data used by the processor 1200 in performing operations.
The embodiment of the invention also provides a cross timeslot interference processing device, which is positioned in a disturbed base station and comprises:
the judging module is used for judging whether the special time slot or the uplink time slot is a cross time slot or not according to the time slot ratio of the judging module and the interference base station before sending the uplink signal, wherein the Shi Rao base station and the interference base station are adjacent and/or close base stations;
and the sending module is used for sending RIM-RS signals to the Shi Raoji station when the special time slot or the uplink time slot is determined to be the crossed time slot.
The specific implementation may refer to 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 being 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. 13 is a schematic structural diagram of a base station ii, as shown in the figure, the base station includes:
a processor 1300, for reading the program in the memory 1320, for executing the following processes:
as an interference base station, detecting an RIM-RS signal sent by an interference base station, wherein the Shi Rao base station and the interference base station are adjacent and/or close base stations;
after the RIM-RS signal is detected, interference back-off and/or mitigation are/is adopted on a downlink time slot corresponding to a special time slot uplink symbol and/or an uplink time slot of a disturbed base station;
a transceiver 1310 for receiving and transmitting data under the control of the processor 1300.
In an implementation, the method further comprises the following steps:
and determining the backoff parameters notified by the interfered base station through the RIM-RS to adopt interference backoff and/or slow down.
In implementation, the backoff parameter notified by the interfered base station is determined by the RIM-RS, and is determined by one or a combination of the ID, the transmission frequency and the transmission time of the RIM-RS, and the backoff parameter notified by the interfered base station comprises one or a combination of the following parameters: frequency of backoff, transmission time, and transmission power.
In an implementation, the method further comprises the following steps:
and performing interference back-off and/or mitigation according to the number of the symbols corresponding to the received RIM-RS uplink symbols by the remote interference management measure.
In an implementation, the method further comprises the following steps:
and performing backoff according to the number of symbols corresponding to the received RIM-RS sequence, wherein the transmission information of different RIM-RS sequences carries the number of symbols which are expected to be backed off by the interference base station by different interfered base stations.
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 the processor 1300, and various circuits, represented by the 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 can be a number of elements including a transmitter and 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 slot interference processing device, which is positioned at a Shi Raoji station and comprises:
the device comprises a detection module, a receiving module and a sending module, wherein the detection module is used for detecting RIM-RS signals sent by a disturbed base station, and the Shi Rao base station and the disturbed base station are adjacent and/or similar base stations;
and the interference back-off and/or mitigation module is used for taking interference back-off and/or mitigation on a downlink time slot corresponding to the uplink symbol and/or the uplink time slot of the special time slot of the interfered base station after the RIM-RS signal is detected.
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 being 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.
The embodiment of the invention also provides a computer readable storage medium, and the computer readable storage medium stores the computer program of the cross timeslot interference processing method.
The specific implementation can refer to the implementation of the cross timeslot interference processing method at the interfered base station and/or the interfering base station side.
In summary, in the technical solution provided in the embodiments of the present invention, RIM-RS is used for dynamic timeslot scheduling of neighboring cells; the interfered base station informs the interfering base station to carry out corresponding transmission backoff of the transmission time slot through the transmission of the RIM-RS;
further, the frequency, transmission time, transmission power, and the like of station backoff may be notified Shi Raoji by the information such as the ID, transmission frequency, and transmission time of RIM-RS.
The scheme can also be used for TDD dynamic spectrum sharing.
It is easy to see that the scheme has at least one of the following effects:
compared with the mode of an advanced receiver, the scheme is simple to realize and has better realizability;
compared with the interference measurement by using the CSI-RS, the implementation of the base station is changed less:
from the standard angle, the base station does not support the use of CSI-RS for interference measurement, a new measurement algorithm is needed, the RIM-RS is a base station function defined by the standard, and the base station has the measurement function of the RIM-RS;
the CSI-RS transmissions between base stations may exceed the slot boundaries (especially in multi-cell scenarios), which may have an impact on measurement performance. The RIM-RS takes the problem of cross-time slot into consideration during design, and the RIM-RS is designed to be a repeated design with two symbol lengths, so that the problem of cross-time slot transmission between base stations can be avoided;
the RIM-RS is used, the base station is required to be added with a function of sending the RIM-RS in an uplink time slot, but the base station is easier to realize compared with a base station detection function of newly added CSI-RS;
compared with the existing interference back-off and/or mitigation technology, the scheme can completely avoid/eliminate the cross time slot interference, so that 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 is 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 also intended to include such modifications and variations.
Claims (25)
1. A method for cross-slot interference processing, comprising:
judging whether the special time slot or the uplink time slot is a cross time slot or not by the interfered base station according to the time slot ratio of the interfered base station to the interfered base station, wherein the Shi Rao base station and the interfered base station are adjacent and/or similar base stations;
when the interfered base station determines that the special time slot or the uplink time slot is the cross time slot, the interfered base station sends a remote interference management reference signal RIM-RS to the interfering base station;
the method further comprises the following steps:
and the interfered base station informs the interference base station of the backoff parameters through the RIM-RS.
2. The method of claim 1, further comprising:
and the sending period of the RIM-RS is configured through an operation maintenance system (OAM).
3. The method of claim 2, further comprising:
after sending out RIM-RS, the interfered base station does not judge the cross time slot in the period.
4. The method of claim 1, further comprising:
and after the RIM-RS sending period is finished, the interfered base station recovers the judgment of the cross time slot.
5. The method of claim 1, wherein the victim base station informs the aggressor base station of the backoff parameter through the RIM-RS is one of an identification ID, a transmission frequency, a transmission time through the RIM-RS, or a combination thereof, and the backoff parameter informing the aggressor base station includes one of the following parameters or a combination thereof: frequency of backoff, transmission time, and transmission power.
6. The method of claim 1, further comprising:
and the interfered base station sends RIM-RS on the corresponding uplink symbols according to the far-end interference avoiding measure rule adopted by the Shi Raoji station and the number of expected symbols backed by the interfering base station.
7. The method of claim 1, further comprising:
and the interfered base station configures a RIM-RS sequence group, and sends different RIM-RS sequences according to the number of expected symbols backed off by the interference base station, wherein the sending information of each RIM-RS sequence bears different numbers of symbols backed off by the interference base station.
8. A method for cross-slot interference processing, comprising:
shi Rao base station detects an RIM-RS signal transmitted by a disturbed base station, wherein Shi Rao base station and the disturbed base station are adjacent and/or close base stations;
shi Raoji station, after detecting RIM-RS signal, taking interference back-off and/or mitigation on the downlink timeslot corresponding to the uplink symbol and/or uplink timeslot of the special timeslot of the interfered base station;
the method further comprises the following steps:
shi Raoji station determines the backoff parameters notified by the victim base station via the RIM-RS.
9. The method of claim 8, wherein the Shi Raoji station determines the backoff parameter notified by the interfered base station through the RIM-RS by one of ID, transmission frequency, transmission time of the RIM-RS or a combination thereof, and determines the backoff parameter notified by the interfered base station and comprising one of the following parameters or a combination thereof: frequency of backoff, transmission time, and transmission power.
10. The method of claim 8, further comprising:
and the interference-exerting base station carries out interference back-off and/or mitigation according to the number of the received symbols corresponding to the RIM-RS uplink symbols by the measures of remote interference management.
11. The method of claim 8, further comprising:
shi Rao base station performs backoff according to the number of symbols corresponding to the received RIM-RS sequence, where the transmission information of different RIM-RS sequences carries the number of symbols that different interfered base stations expect to backoff.
12. A base station, comprising:
a processor for reading the program in the memory, performing the following processes:
as a disturbed base station, before sending an uplink signal, judging whether the special time slot or the uplink time slot is a cross time slot according to the time slot ratio of the disturbed base station and the self, wherein the Shi Rao base station and the disturbed base station are adjacent and/or close base stations;
when the special time slot or the uplink time slot is determined to be the cross time slot, sending an RIM-RS signal to a Shi Raoji station;
a transceiver for receiving and transmitting data under the control of the processor;
a processor further configured to:
and informing the interference base station of the backoff parameters through the RIM-RS.
13. The base station of claim 12, further comprising:
and the sending period of the RIM-RS is configured through an operation maintenance system (OAM).
14. The base station of claim 13, further comprising:
after sending out RIM-RS, in this period, no cross time slot judgment is made.
15. The base station of claim 13, further comprising:
and after the RIM-RS sending period is finished, the judgment of the cross time slot is recovered.
16. The base station of claim 12, wherein the informing of the interfering base station of the backoff parameter by the RIM-RS is one or a combination of an ID, a transmission frequency, and a transmission time of the RIM-RS, and wherein the informing of the interfering base station of the backoff parameter comprises one or a combination of the following parameters: frequency of backoff, transmission time, and transmission power.
17. The base station of claim 12, further comprising:
and sending RIM-RS on corresponding uplink symbols according to a far-end interference avoidance measure rule adopted by a Shi Raoji station and the number of expected symbols backed off by the interference base station.
18. The base station of claim 12, further comprising:
and configuring a RIM-RS sequence group, and sending different RIM-RS sequences according to the number of the symbols expected to be backed off by the interference base station, wherein the sending information of each RIM-RS sequence bears different numbers of the symbols expected to be backed off by the interference base station.
19. A base station, comprising:
a processor for reading the program in the memory, performing the following processes:
as an interference base station, detecting an RIM-RS signal sent by an interference base station, wherein the Shi Rao base station and the interference base station are adjacent and/or close base stations;
after the RIM-RS signal is detected, interference backoff and/or mitigation is adopted on a downlink time slot corresponding to a special time slot uplink symbol and/or an uplink time slot of a disturbed base station;
a transceiver for receiving and transmitting data under the control of the processor;
a processor further configured to:
and determining the backoff parameters notified by the interfered base station through the RIM-RS.
20. The base station of claim 19, wherein the backoff parameter notified by the interfered base station is determined by the RIM-RS by one or a combination of an ID, a transmission frequency, a transmission time of the RIM-RS, and the backoff parameter notified by the interfered base station comprises one or a combination of the following parameters: frequency of backoff, transmission time, and transmission power.
21. The base station of claim 19, further comprising:
and performing interference back-off and/or mitigation according to the number of the symbols corresponding to the received RIM-RS uplink symbols by the remote interference management measure.
22. The base station of claim 19, further comprising:
and performing backoff according to the number of symbols corresponding to the received RIM-RS sequences, wherein the transmission information of different RIM-RS sequences bears the number of symbols which are expected to be backed off by the interference base station by different interfered base stations.
23. A cross-slot interference processing apparatus, located at a victim base station, comprising:
the judging module is used for judging whether the special time slot or the uplink time slot is a cross time slot or not according to the time slot ratio of the judging module and the interference base station before sending the uplink signal, wherein the Shi Rao base station and the interference base station are adjacent and/or close base stations;
a sending module, configured to send an RIM-RS signal to a Shi Raoji station when it is determined that the special timeslot or the uplink timeslot is a cross timeslot;
the sending module is further used for the interfered base station to inform the interference base station of the backoff parameters through the RIM-RS.
24. A cross-slot interference processing apparatus located at Shi Raoji, comprising:
the device comprises a detection module, a processing module and a processing module, wherein the detection module is used for detecting an RIM-RS signal sent by a disturbed base station, and a Shi Rao base station and the disturbed base station are adjacent and/or close base stations;
the interference back-off and/or mitigation module is used for taking interference back-off and/or mitigation on a downlink time slot corresponding to an uplink symbol and/or an uplink time slot of a special time slot of the interfered base station after the RIM-RS signal is detected;
and the interference backoff and/or mitigation module is also used for determining a backoff parameter notified by the interfered base station through the RIM-RS by the interfering base station.
25. A computer-readable storage medium, in which a computer program is stored which, when run on a computer, causes the computer to carry out the method of any one of claims 1 to 11.
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