CN110012504A

CN110012504A - A kind of information transferring method, base station and network management unit

Info

Publication number: CN110012504A
Application number: CN201810009351.7A
Authority: CN
Inventors: 柯颋; 邵华; 夏亮
Original assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Co Ltd
Current assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Co Ltd
Priority date: 2018-01-05
Filing date: 2018-01-05
Publication date: 2019-07-12
Anticipated expiration: 2038-01-05
Also published as: CN110012504B

Abstract

The embodiment of the present invention provides a kind of information transferring method, base station and network management unit.Wherein method includes: that the base station is determined with reference to frame structure；The base station determines the first downlink transfer resource collection according to the last one downlink OFDM symbol in a frame period to the spacing between the first reference point；Wherein, described to be included at least with reference to frame structure: the frame period of reference frame and the first reference point.While the solution of the present invention effectively evades base station Heterogeneity to adversely affecting caused by telepoint base station interference management process, so that far-end interference rollback is more efficient.

Description

Information transmission method, base station and network management unit

Technical Field

The present invention relates to the field of communications, and in particular, to an information transmission method, a base station, and a network management unit.

Background

The far-end base station interference phenomenon has a particularly wide range of influence (hundreds of km), and may involve base stations in multiple cities, provinces, and even countries. Different cities, provinces and even countries adopt base station equipment of different manufacturers, and if a standardized remote interference management mechanism is not available, cooperation of different manufacturers is particularly difficult.

To solve the above problems, a remote base station interference management mechanism in an LTE network is specified in the prior art, such as a frame structure shown in fig. 1 and an interference back-off method shown in fig. 2, where the remote base station interference management mechanism mainly includes 2 steps:

1) positioning an interfering base station causing far-end interference;

2) the frame structure of the interfering base station is adjusted manually.

As shown in fig. 1 and 2, the LTE network configures a special subframe (S) as a 9:3:2 structure by default, that is, the special subframe of LTE includes 14 OSs (OFDM symbols, abbreviation of OFDM symbols), wherein OS #0 to #8 is configured as DL, OS #9 to #11 is configured as GP, and the remaining OS #12 to #13 is configured as UL.

1) Locating interfering base stations causing far-end interference

At least one first base station takes 1024 radio frames as a first period (corresponding to 10.24s), selects a specific radio frame in the first period, and continuously transmits a first reference signal, wherein the first reference signal is used for discovering and positioning a remote base station interference source.

In particular, an offset of the particular radio frame within a first period is determined by an ID of the first base station. Therefore, when the second base station detects the first reference signal, the second base station can reversely derive the partial attribute of the first base station ID according to the offset position of the wireless frame in which the first reference signal is located in the first period.

Specifically, in the selected radio frame, the first bs fixes transmitting the first reference signal in the last 2 OSs (corresponding to OSs #7 to # 8) in the DwPTS of subframe 1.

On the other hand, the first base station needs to try to detect the second reference signals transmitted by other base stations in all radio frames in the first period in order to find and locate the far-end interference from other base stations.

In particular, the first base station listens for the second reference signal on UpPTS within each radio frame and 16 OSs in subframe 2 (OS #12- #13 corresponding to special subframes, plus all OSs of subframe 2).

2) Frame structure of interference base station adjusted by manual mode

Once the first base station detects a certain second reference signal, the first base station reports the certain second reference signal to the network management unit.

And the network management unit reversely deduces the ID of a third base station according to the offset position of the wireless frame in which the second reference signal is positioned in the first period, wherein the third base station sends the second reference signal.

And subsequently, manually modifying the special subframe of the third base station into a 3:9:2 structure, namely configuring No. 0 to No. 2 OS in the LTE special subframe into DL, configuring No. 3 to No. 11 OS into GP, and configuring the rest No. 12 to No. 13 OS into UL.

The 3:9:2 frame structure uses fewer DL symbols than the default 9:3:2 frame structure, and therefore DL transmissions by a base station employing the 3:9:2 frame structure are reasonably expected to reduce UL interference to other remote base stations.

As can be seen from the above description, the interference management method for the remote base station adopted in the existing LTE network has 2 problems:

1. not flexible enough: once the far-end interference base station is positioned, the frame structure can be modulated only in a manual mode to carry out interference backspacing;

2. the performance loss is large: interference back-off can only select a 3:9:2 frame structure. Compared with 9:3:2, 6 downlink OFDM symbols are lost in 3:9:2, and the loss of downlink transmission performance is large.

In view of the foregoing problem of insufficient flexibility, in the prior art, a remote base station interference management process based on wide area SON management is proposed and shown in fig. 3:

1. the base station V detects the interference phenomenon of the remote base station;

2. reporting potential interference to the wide-area SON;

3. the wide area SON informs the base station V to send RS 1;

4. the wide area SON informs base station a to listen to RS 1;

5. the base station V repeatedly transmits RS 1;

6. the base station A repeatedly detects RS 1;

7. the base station A reports the interference detection result to the wide area SON;

8. the wide area SON configures an interference back-off mechanism for the base station A;

9. the base station a performs an interference back-off operation.

In terms of flexibility, compared with the prior art that utilizes manual frame structure adjustment in the LTE existing network, the technique based on wide-area SON base station management shown in fig. 3 can coordinate base station behaviors more flexibly and change the base station frame structure, so that the method is more flexible.

In terms of backoff performance loss, compared with the prior art of fixedly backoff 6 downlink OFDM symbols in the LTE existing network, the technology based on the wide area SON base station management shown in fig. 3 can adjust the DL backoff duration (possibly less than 6 OFDM symbols) in a targeted manner based on the detected interference detection range, so that the network performance loss caused by the method is smaller.

In particular, the following gives a workflow and an example thereof based on a wide area SON base station management mechanism in a homogeneous network (i.e. assuming that all base stations employ the same frame structure configuration).

As shown in fig. 4, when a certain TRP is configured to transmit a first RS, the TRP determines to transmit the RS using at least 1 downlink OFDM symbol forward, starting from the 1 st downlink OFDM symbol (downlink OFDM symbol) before GP (guard interval). And when a certain TRP is configured to receive the first RS, the TRP determines to use at least 1 uplink OFDM symbol to monitor the RS from the 1 st uplink OFDM symbol after GP. Wherein the RS can be used for detecting the interference phenomenon of the remote base station.

With reference to the interference management procedure of the remote base station shown in fig. 3 and the interference detection of the RS time-domain transceiving resource location of the remote base station shown in fig. 4, the homogeneous network can work normally.

Fig. 5 is a view showing the topological structure of TRP1 and TRP 2;

fig. 6 is a schematic diagram of data domain interference characteristics, the UL data of TRP1 and TRP2 being interfered by each other DL data;

fig. 7 is a TRP1 triggered remote base station interference management procedure (involving steps 1, 2, 3, 4, 5, 6, 7). The TRP1 transmits RS on the last 2 DL OFDM symbols before GP, TRP2 listens for RS on multiple UL OFDM symbols after GP and reports the listening result: the interference influence interval is 1 OFDM symbol;

fig. 8 shows interference back-off and its effect (involving steps 8, 9). Wide-area SON configuration TRP2 fallback 2 DL OFDM symbols to cancel far-end interference impact of TRP2 on TRP1

As shown in fig. 5 and 6, TRP1 and TRP2 are separated by approximately 3.5 OSs (OFDM symbols, abbreviation of OFDM symbols) and employ identical frame structures (i.e., the DL, GP and UL configurations of TRP1 and TRP2 are identical in the same period), and TRP1 and TRP2 remain synchronized in time.

Due to a special atmospheric propagation environment, signals transmitted by the TRP1 and the TRP2 on part of downlink OFDM symbols can reach part of uplink OFDM symbols of an opposite party at a certain received power level, and further serve as strong interference signals, so that the strong interference signals have strong influence on the UL data transmission performance of the signals. For example, in fig. 6, TRP1 and TRP2 may experience interference from the opposing base station DL signal on about 1.5 uplink OFDM symbols after GP.

The TRP1 and TRP2 determine that the interference may be from the remote base station by detecting the statistical rule of the interference signal, and report the interference to the wide-area SON, so as to trigger the interference management process of the remote base station based on the wide-area SON management shown in fig. 3.

Note that TRP1 and TRP2 independently trigger remote base station interference management procedures based on wide area SON management. In fig. 7 and 8, only the related processing after the TRP1 triggers the interference management flow of the remote base station based on the wide-area SON management is illustrated, and the effect thereof is also illustrated. Through this procedure, the TRP2 performs DL fallback in the configuration of the wide-area SON to eliminate the far-end interference it causes to the TRP 1.

As shown in fig. 8, after the TRP1 triggers the remote base station interference management procedure based on the wide-area SON management, the remote interference caused by the TRP2 can be eliminated. However, TRP2 is still subject to distal interference from TRP 1. Therefore, it is a natural operation that, similarly to the operations shown in fig. 5 and fig. 6, the TRP2 also triggers the remote base station interference management procedure based on the wide-area SON management together to eliminate the remote interference caused to it by the TRP 1. Therefore, through the above operations, TRP1 and TRP2 can effectively eliminate their far-end interference to each other.

In particular, fig. 7 and 8 further illustrate details of operations of the remote base station interference management procedure based on wide-area SON management, including:

step 1: TRP1 (base station V in the flow chart, wherein V represents victim) judges that the interference may come from the far-end base station by detecting the statistical regularity of the interference signal;

step 2: the TRP1 reports the interference situation to the wide-area SON to trigger the remote base station interference management process based on the wide-area SON management;

and step 3: the wide-area SON informs the TRP1 to send a dedicated remote base station interference sounding reference signal, first RS for short, on the last 2 DL OFDM symbols before the GP;

and 4, step 4: the wide-area SON informs at least one potential interfering base station (base station a in the flow chart, where a stands for accumulator) including TRP2 to listen to the first RS on a plurality of UL OFDM symbols after GP;

and 5: the TRP1 transmits the first RS according to the wide-area SON configuration;

step 6: the TRP2 monitors a first RS according to the wide area SON configuration, and monitors the first RS in a first uplink OFDM symbol after GP at most;

and 7: the TRP2 reports the interception result including the maximum influence range (such as 1 OFDM symbol) to the wide-area SON;

and 8: the wide-area SON configures TRP2 to perform an interference backoff operation, so that at least 2 downlink OFDM symbols are backed off;

and step 9: the TRP2 performs an interference back-off operation for 2 downlink OFDM symbols according to the wide-area SON configuration to cancel its far-end interference to the TRP 1.

The above-mentioned transceiving time domain resource location of the remote base station interference sounding RS shown in fig. 4 can normally operate in a homogeneous network (i.e. all base stations are assumed to adopt the same frame structure configuration), but may not normally operate in a heterogeneous network (i.e. some base stations in the network adopt different frame structure configurations), and needs to be enhanced.

Disclosure of Invention

The invention provides an information transmission method, a base station and a network management unit. The adverse effect of the heterogeneous problem of the base station on the interference management process of the remote base station is effectively avoided, and meanwhile, the remote interference rollback is more efficient.

To solve the above technical problem, an embodiment of the present invention provides the following solutions:

an information transmission method is applied to a base station and comprises the following steps:

the base station determines a reference frame structure;

the base station determines a first downlink transmission resource set according to the distance from the last downlink OFDM symbol to a first reference point in a frame period; wherein the reference frame structure comprises at least: a frame period of the reference frame and a first reference point.

If the first downlink transmission resource set at least comprises one downlink OFDM symbol, aiming at the at least one OFDM symbol in the first downlink transmission resource set, at least one method is adopted, wherein the method comprises the steps of not sending downlink data, limiting the downward inclination angle value range of an antenna and limiting the downlink transmission power value range.

Wherein the not sending downlink data further comprises:

and adjusting the uplink and/or downlink time domain transmission resource allocation used when the base station communicates with the terminal served by the base station, wherein the downlink OFDM symbol is used as a guard interval GP or an uplink OFDM symbol.

When the base station determines a first downlink transmission resource set, if the distance between the last downlink OFDM symbol and a first reference point is greater than or equal to a first duration, setting the first downlink transmission resource set as an empty set; otherwise, the first downlink transmission resource set is set to at least comprise one continuous downlink OFDM symbol, and the distance between the first OFDM symbol in the first downlink transmission resource set and the first reference point is ensured to be larger than or equal to the first duration.

Before the base station determines the first downlink transmission resource set, the method further includes:

the base station determines a first time length according to the second time length; or,

the base station receives the seventh indication information and determines a first time length; and the seventh indication information is carried by at least one indication method of network management unit configuration and signaling between base stations.

Wherein the reference frame structure further comprises: a second reference point.

Before the base station determines the first time length, the method further comprises:

the base station determines a second time length; the second duration represents: the second reference point is furthest behind the first reference point to be able to detect the time distance between the symbol of the first reference signal and the second reference point.

The base station determines the reference frame structure according to at least one method of the preset, the network management unit configuration and the signaling indication between the base stations.

When the base station determines the reference frame structure through at least one method of network management unit configuration and inter-base station signaling indication, the base station receives at least one indication information as follows:

the base station receives first indication information, wherein the first indication information is used for determining the frame period;

the base station receives second indication information, wherein the second indication information is used for determining a second reference point, the second indication information comprises a third time length, and the time distance from the second reference point to a preset boundary of the frame period is equal to the third time length;

the base station receives third indication information, wherein the third indication information is used for determining a first reference point, the third indication information includes a fourth time length, a time distance between the first reference point and the second reference point is equal to the fourth time length, and in the frame period, a time corresponding to the first reference point is not earlier than a time corresponding to the second reference point.

the base station receives fourth indication information, wherein the fourth indication information comprises: a first transmission switching period and a first upper limit of transmission resources for downlink transmission in the first transmission switching period;

the base station determines the reference frame structure according to the fourth indication information, and the method includes at least one of the following steps:

the base station determines the frame period of the reference frame according to a first transmission conversion period;

and the base station determines a second reference point according to the first upper limit.

Wherein determining the reference frame structure according to at least one of the following methods comprises:

the base station determines that the frame period of the reference frame is equal to a first transmission switching period;

the base station determines the maximum available downlink transmission resource set in the first transmission conversion period according to a first upper limit; and the base station determines that the starting time of the second reference point is equal to the ending time of the last downlink transmission resource in the maximum available downlink transmission resource set.

Wherein the base station listens for the first reference signal starting from the second reference point.

Wherein the base station listens for the first reference signal for a fifth duration from the second reference point.

The base station determines a fifth time length through presetting; or,

the base station receives fifth indication information and determines a fifth time length; and the fifth indication information is loaded through at least one indication method of network management unit configuration and signaling between base stations.

The base station sends a second reference signal in a time interval [ a first reference point-a sixth time length, the first reference point ], wherein the sixth time length is a time domain length of the second reference signal.

The base station determines a sixth time length through presetting; or,

the base station receives sixth indication information and determines a sixth time length; and the sixth indication information is carried by at least one indication method of network management unit configuration and signaling between base stations.

Wherein the base station listens for a first reference signal in a plurality of consecutive or non-consecutive reference frames.

Wherein, the base station determines the first time length according to the second time length, and further comprises:

a first duration being a maximum of a set of durations consisting of second durations observed for the at least one first reference signal; or,

the first duration is the maximum of a set of durations consisting of the second duration + the first constant observed for the at least one { first reference signal }.

The information transmission method further comprises the following steps:

the base station sends a reporting signaling to a network management unit and reports a first measurement result; wherein the first measurement result is a measurement result of the first reference signal.

Wherein, the reporting signaling further comprises at least one of the following information:

the base station identification, a second duration for at least one first reference signal, a received power of the first reference signal, a received power offset of the first reference signal, and a strength level of the first reference signal;

wherein, the received power of the first reference signal is equal to the first reference signal received power offset + the received power offset reference value of the first reference signal.

When the reporting signaling comprises the received power of the first reference signal, the base station determines the unit of the received power of the first reference signal through at least one indication method of pre-specification, network management unit configuration and signaling between base stations;

when the reporting signaling comprises the received power offset of the first reference signal, the base station determines the received power offset reference value of the first reference signal and the unit of the received power offset of the first reference signal through at least one indicating method in the processes of pre-specification, network management unit configuration and signaling between the base stations;

when the reporting signaling comprises the strength grade of the first reference signal, the base station determines a signal strength grade set consisting of at least one signal strength grade through at least one indication method in the processes of presetting, network management unit configuration and signaling between the base stations.

The embodiment of the invention also provides an information transmission method, which is applied to a network management unit and comprises the following steps:

configuring a reference frame structure for at least one first base station and/or second base station, the reference frame structure comprising: a frame period of the reference frame, and at least one of the following information: a second reference point and a first reference point in a frame period of the reference frame.

The information transmission method further comprises the following steps:

receiving a reporting signaling reported by at least one first base station, wherein the reporting signaling is used for reporting a first measurement result; wherein the first measurement result is a measurement result of the first reference signal.

The information transmission method further comprises the following steps:

and after receiving the reported signaling of the first base station, the network management unit sends indication information for executing interference rollback operation to the base station.

The information transmission method further comprises the following steps:

and sending a network management unit feedback signaling to at least one first base station, wherein the feedback signaling is used for informing the first time length.

Before at least one first base station sends a network management unit feedback signaling, the method further comprises:

the network management unit determines a first time length according to the second time length; wherein,

An embodiment of the present invention further provides a base station, including:

a processor for determining a reference frame structure; determining a first downlink transmission resource set according to the distance from the last downlink OFDM symbol to a first reference point in a frame period; wherein the reference frame structure comprises at least: a frame period of the reference frame and a first reference point.

An embodiment of the present invention further provides a network management unit, including:

a processor configured to configure a reference frame structure for at least one first base station and/or second base station, the reference frame structure comprising: a frame period of the reference frame, and at least one of the following information: a second reference point and a first reference point in a frame period of the reference frame.

An embodiment of the present invention further provides a communication device, including: a processor, a memory storing a computer program which, when executed by the processor, performs the method as described above.

Embodiments of the present invention also provide a computer-readable storage medium including instructions that, when executed on a computer, cause the computer to perform the method as described above.

The scheme of the invention at least comprises the following beneficial effects:

according to the scheme, the reference frame structure independent of the real frame structure of each base station is defined, and each base station sends/receives the interference detection reference signal of the remote base station according to the reference frame structure, so that the adverse effect of the heterogeneous problem of the base station on the interference management process of the remote base station is effectively avoided, and a more efficient interference back-off scheme is provided.

Drawings

FIG. 1 is a schematic diagram of a frame structure;

fig. 2 is a schematic diagram of interference backoff;

fig. 3 is a remote base station interference management process;

FIG. 4 shows the resource location of the time domain of the receiving and transmitting of the interference detection RS of the remote base station in the homogeneous network;

FIG. 5 is a topology of a base station in a homogeneous network;

fig. 6 shows that UL data of TRP1 and TRP2 in a homogeneous network are interfered by DL data of each other;

fig. 7 is a schematic diagram of TRP1 triggering interference management procedure of a remote base station in a homogeneous network;

fig. 8 is a schematic diagram illustrating the effect of 2 DLs fallback by wide-area SON configuration TRP2 in a homogeneous network;

FIG. 9 is a diagram illustrating a reference frame structure;

FIG. 10 is a diagram illustrating the location of time domain resources for interference sounding reference signal transmission/reception by a remote base station;

FIG. 11 is a schematic diagram of a second time period;

fig. 12 is a schematic diagram of an interference backoff mechanism;

fig. 13 shows a heterogeneous network according to the present invention: DL alignment, GP length different, cause UL misalignment under the interference back-off diagram;

fig. 14 is a flow chart illustrating a remote base station interference management technique based on an interference self-suppression mode of operation;

FIG. 15 is a diagram of a semi-static frame structure;

fig. 16 is a diagram illustrating a heterogeneous network.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

The embodiment of the invention provides an information transmission method, which is applied to a base station and comprises the following steps:

the base station determines a reference frame structure;

In this embodiment of the present invention, the reference frame structure further includes: a second reference point. The embodiment defines a reference frame structure independent of the real frame structure of each base station, and each base station sends/receives a reference signal (the reference signal can be used for detecting the interference phenomenon of the remote base station) according to the reference frame structure, so that the adverse effect of the heterogeneous problem of the base station on the interference management process of the remote base station is effectively avoided.

In a specific embodiment of the present invention, the base station determines the reference frame structure by at least one indication method of a predefined OAM configuration of a network management unit and a configuration signaling (backhaul signaling) between base stations, where the network management unit can manage a plurality of base stations.

The term "predetermined" as used herein means that the predetermined standard protocol is defined in advance.

Here, OAM configuration refers to static configuration by a network management unit.

Here, the configuration through backhaul signaling between base stations refers to: assuming that there is a global, or local, network management element in the network, the network management element may semi-statically govern (including coordinate, and/or adjust) the behavior of some or all of the base stations in the network. The network management element may be a physical entity or simply a virtual entity. The network management unit may be referred to by the names SON, wide area SON, large data processing center, etc. And the network management unit configures parameters such as a first period, a second reference point, a first reference point and the like of the base station through backhaul signaling between the base stations.

In a specific embodiment of the present invention, when the base station determines the reference frame structure through at least one indication method in the network management unit configuration and the configuration signaling between the base stations, the reference frame structure includes at least one of the following information indication information: the base station receives first indication information, wherein the first indication information is used for determining the frame period;

The preset boundary here may be an ending boundary of the frame period, a starting boundary of the frame period, or other reference positions in the frame period. When the preset boundary is the right boundary of the reference frame period, the relationship between the third duration and the second reference point and the reference frame structure are as shown in fig. 9.

In a specific embodiment of the present invention, the base station determines the time indication units of the frame period, the third duration and the fourth duration by at least one indication method of a predefined indication method, a network management unit configuration and a configuration signaling between base stations.

The time indication units of the frame period, the third duration and the fourth duration here include: absolute time indicates a unit (e.g., seconds, milliseconds, microseconds, etc.) and/or a reference OFDM (orthogonal frequency division multiplexing) symbol number.

When the time indication unit is the number of the reference OFDM symbols, the base station directly indicates the time length of the reference OFDM symbols through at least one indication information of a preset indication information, a network management unit static configuration information and a configuration signaling between the base stations, or indirectly indicates the subcarrier spacing SCS of the reference OFDM symbols and the cyclic prefix CP type of the reference OFDM symbols, and deduces the time length of the reference OFDM symbols.

In another specific embodiment of the present invention, when the base station determines the reference frame structure through at least one of network management unit configuration and inter-base station signaling indication, the base station receives at least one of the following indication information:

the base station receives fourth indication information, wherein the fourth indication information comprises: a first transmission switching period, and a first upper limit of transmission resources for downlink transmission in the first transmission switching period.

And a second transmission switching period configured for the mobile communication terminal by the target cell is the same as the first transmission switching period, and the number of downlink transmission resources in the second transmission switching period is less than or equal to a first upper limit.

In an embodiment of the present invention, as shown in fig. 10, the base station listens to the first reference signal from the second reference point.

In this embodiment, specifically, the base station may listen to the first reference signal from the second reference point; preferably, the base station determines the fifth time duration by presetting; or, the base station receives fifth indication information and determines a fifth time length; and the fifth indication information is loaded through at least one indication method of network management unit configuration and signaling between base stations. The fifth time period may adopt any one of the following time indication units, including: absolute time indication units (e.g., s, ms, us, etc.), and reference OFDM symbol numbers.

In this embodiment, the base station transmits the second reference signal in a time interval [ first reference point-sixth duration, first reference point ], where the sixth duration is a time domain length of the second reference signal.

The base station determines a sixth time length through presetting; or, the base station receives sixth indication information and determines a sixth time length; and the sixth indication information is carried by at least one indication method of network management unit configuration and signaling between base stations. The sixth duration may adopt any one of the following time indication units, including: absolute time indication units (e.g., s, ms, us, etc.), and reference OFDM symbol numbers.

In one embodiment of the present invention, the base station listens for the first reference signal in a plurality of consecutive or non-consecutive reference frames.

In an embodiment of the present invention, the method further includes: the base station determines a second time length; the second duration represents: the second reference point is furthest behind the first reference point to be able to detect the time distance between the symbol of the first reference signal and the second reference point.

Fig. 11 is a diagram illustrating the second period. The second duration may adopt any one of the following time indication units, including: absolute time indication units (e.g., s, ms, us, etc.), and reference OFDM symbol numbers.

After the first base station determines the second duration, the method further includes: the base station determines a first time length according to the second time length; or,

The base station determines the first time length according to the second time length, and the method further comprises the following steps:

In a specific embodiment of the present invention, the information transmission method further includes:

the base station sends a reporting signaling to the network management unit and reports a first measurement result; wherein the first measurement result is a measurement result of the first reference signal.

Specifically, after the first base station obtains the second duration through measurement, the first base station has 2 processing flow options, including:

opt 1: the first base station sends a first signaling to the network management unit, and reports a first measurement result, where the first measurement result is a measurement result of the first reference signal, which corresponds to step 7 in fig. 3. And after the first base station reports the first measurement result to the network management unit, the first base station waits for the next indication of the network management unit, namely the network management unit takes over the subsequent processing flow.

Opt 2: the first base station actively triggers a subsequent processing flow, which comprises the following steps: the first time period is actively determined. In the process flow of Opt 2, no participation of the network management unit is required. Corresponding to the base station internal processing between step 3 and step 4 in fig. 14.

The first time length may adopt any one of the following time indication units, including: absolute time indication units (e.g., s, ms, us, etc.), and reference OFDM symbol numbers.

In this embodiment, the reporting signaling further includes at least one of the following information: a base station identification, a second duration for at least one first reference signal, a received power of the first reference signal, a received power offset of the first reference signal, and a strength level of the first reference signal; wherein, the received power of the first reference signal is equal to the first reference signal received power offset + the received power offset reference value of the first reference signal.

When the reporting signaling includes the received power of the first reference signal, the base station determines the unit of the received power of the first reference signal through at least one indication method of pre-specification, OAM (network administration and maintenance) unit configuration and signaling between base stations;

when the reporting signaling comprises the received power offset of the first reference signal, the base station determines the received power offset reference value of the first reference signal and the unit of the received power offset of the first reference signal through at least one indicating method in the processes of presetting, OAM configuration and signaling between the base stations;

when the reporting signaling comprises the strength grade of the first reference signal, the base station determines a signal strength grade set consisting of at least one signal strength grade through at least one indication method in the processes of pre-specification, OAM configuration and signaling between the base stations.

In an embodiment of the present invention, the method further includes: and the base station receives the indication information for executing the interference rollback operation sent to the base station by the network management unit after receiving the reporting signaling of the base station.

In an embodiment of the present invention, the method further includes: and the base station receives a feedback signaling sent by the network management unit, where the feedback signaling (the seventh indication information described above) is used to notify the first duration.

Specifically, corresponding to step 8 in fig. 3, after the network management unit receives the first signaling reported by the first base station, the network management unit determines whether to let the first base station execute the interference back-off operation by comprehensively considering various factors, such as the measurement result reported by the first base station.

For example, at least one third base station, which is geographically close to the first base station, of the network management unit also reports the first signaling for the first reference signal, and after the at least one third base station is performing the interference backoff operation, the network management unit may decide to temporarily not allow the first base station to perform the interference backoff operation.

The network management unit will wait for the interference back-off operation of the at least one third base station to take effect. Since the first base station and the at least one third base station are geographically close, the at least one third base station and the first base station may both be interference sources for the fourth base station (i.e., the victim station that transmitted the first reference signal). Therefore, when the interference back-off operation of the at least one third base station is effective, the degree of the far-end interference suffered by the fourth base station may have been greatly improved, and reporting of the far-end interference discovery event is stopped. At this time, the network management unit will not configure the first base station to perform the interference back-off operation.

Otherwise, if the fourth base station still reports the far-end interference discovery event after the interference back-off operation of the at least one third base station is finished, that is, it indicates that the interference problem of the far-end base station is still not solved, at this time, the network management unit configures the first base station to execute the interference back-off operation.

In this embodiment, the first duration is the maximum of a set of durations consisting of second durations observed for the at least one first reference signal; or,

Wherein, the first constant is the reference OFDM symbol length corresponding to the SCS of the first reference signal.

Further, after the base station determines the first time length, the method further includes: the base station determines a downlink OFDM symbol backoff set.

As shown in fig. 12, in the embodiment of the present invention, the method further includes: when the base station determines a first set of downlink transmission resources, wherein:

if the distance between the last downlink OFDM symbol and the first reference point is greater than or equal to a first duration, setting the first downlink transmission resource set as an empty set; otherwise, the first downlink transmission resource set is set to at least comprise one continuous downlink OFDM symbol, and the distance between the first OFDM symbol in the first downlink transmission resource set and the first reference point is ensured to be larger than or equal to the first duration.

In an embodiment of the present invention, if the first downlink transmission resource set includes at least one downlink OFDM symbol, for limiting the remote interference strength of the at least one OFDM symbol in the first downlink transmission resource set, at least one of the following methods is adopted, including: downlink data is not sent, the value range of the downward inclination angle of the antenna is limited, and the value range of downlink transmitting power is limited; specifically, for each OFDM symbol in the first set of downlink transmission resources, to limit the remote interference strength, at least one of the following methods may be adopted, including: downlink data is not sent, the value range of the downward inclination angle of the antenna is limited, and the value range of downlink transmitting power is limited;

wherein the not sending DL data further comprises adjusting uplink and/or downlink time domain transmission resource allocation used when the base station communicates with the terminal served by the base station, including using a downlink OFDM symbol as a guard interval GP or an uplink OFDM symbol.

Finally, a specific implementation of the above-described scheme of the present invention is described with reference to fig. 13 and 14:

fig. 14 is a flow chart illustrating a remote base station interference management technique based on the interference self-suppression mode 160, as shown in the figure:

step 0, the DL data of the interference station interferes the UL data receiving behavior of the interfered station;

step1, a victim station detects the interference characteristics suffered by UL data and determines that the victim station is interfered by a remote base station;

and step 2, the interfered station sends a second reference signal so that the second reference signal can be detected by other base stations (including the interference base station). Note that the transmission of the second reference signal is conditional, i.e. the second reference signal is transmitted only if the victim base station guesses itself to be affected by the far-end interference;

and step 3, the interference station listens for a second reference signal. Note that the behavior of the offending station to listen for the second reference signal is unconditional, i.e. the offending station is always trying to listen for the second reference signal;

and 4, after the interference station detects the second reference signal, the interference station determines whether to perform interference backoff operation based on the independent determination of the interference station.

Shown in fig. 13 is a heterogeneous network: case of DL, GP and UL misalignment:

in the comparison solution shown in fig. 10, the interference management mechanism of the remote base station will fail. In the scheme shown in fig. 13, the interference management mechanism of the remote base station can still work normally.

As shown in fig. 13, DL alignment of TRP1 and TRP2, GP length was different, resulting in UL misalignment; whereas TRP1 and TRP3 are UL aligned, GP is different in length, resulting in DL misalignment. TRP1, TRP2 and TRP3 interfere with each other two by two.

In step1 of fig. 13, TRP1 found the presence of a distant interference (corresponding to step1 of the flowchart), whose interfering signals came from TRP2 and TRP 3.

In step 2 of fig. 13, TRP1 transmits a remote base station interference sounding RS (first RS for short) in 2 downlink OFDM symbols before the first reference point according to the reference frame structure (corresponding to step 5 in the flowchart); TRP2 and TRP3 listen for the first RS in at least one uplink OFDM symbol after the second reference point according to its own frame structure (corresponding to step 6 in the flowchart). TRP2 and TRP3 sensed the first RS most in the third uplink OFDM symbol after the second reference point. At this time, TRP2 and TRP3 had 2 treatment options including:

opt 1: the TRP2 and TRP3 send a first signaling to the network management unit and report a first measurement result, where the first measurement result is a measurement result of the first reference signal, which corresponds to step 7 in fig. 3. Specifically, the TRP2 and TRP3 report the listening result (i.e., the second duration is 3 OFDM symbols) to the wide-area SON. And after the first base station reports the first measurement result to the network management unit, the first base station waits for the next indication of the network management unit, namely the network management unit takes over the subsequent processing flow.

Correspondingly, the wide-area SON configures the TRP2 and the TRP3 to perform an interference fallback operation based on the interference measurement results reported by the TRP2 and the TRP 3. The wide-area SON determines that the first duration is the second duration +1 OFDM symbols (SCS corresponding to reference frame structure) is 4 OFDM symbols, and configures TRP2 and TRP3 to back off 4 OFDM symbols.

Opt 2: TRP2 and TRP3 actively trigger subsequent processing flows including: the first time period is actively determined. In the process flow of Opt 2, participation of the network management unit is not required, corresponding to the base station internal process between step 3 and step 4 in fig. 14.

Specifically, TRP2 and TRP3 determine that the first time duration is the second time duration +1 OFDM symbols (SCS corresponding to the reference frame structure) is 4 OFDM symbols.

In step 3 of fig. 13, TRP2 and TRP3 determine an actual downlink OFDM symbol backoff set according to the first time length. Specifically, the TRP2 determines, according to the first time length, that the actual downlink OFDM symbol backoff set includes 4 OFDM symbols [ #2, #3, #4, #5 ]; and the TRP3 determines that the actual downlink OFDM symbol backoff set includes 2 OFDM symbols, which are [ #2, #3] according to the first duration.

The final effect of step 3 in fig. 13 shows that after TRP2 and TRP3 perform back-off, there will be no further far-end interference to TRP 1.

However, as shown in fig. 15 and fig. 16, fig. 15 is a semi-static frame structure configuration that may be adopted by the 5G NR, in which, within a preset frame structure period T, a part of time domain resources at the beginning is specified to be fixedly used for DL transmission, a part of time domain resources at the end is specified to be fixedly used for UL transmission, and the remaining time domain resources in the middle can flexibly determine the data transmission direction thereof, or no data transmission is performed.

Due to the existence of the semi-static frame structure, in the 5G NR network, a heterogeneous network should be a typical network feature.

Fig. 16 is a heterogeneous network type 1: DL alignment, GP length difference, resulting in UL misalignment; whereas TRP1 and TRP3 are UL aligned, GP is different in length, resulting in DL misalignment. TRP1, TRP2 and TRP3 interfere with each other two by two.

In fig. 16-step1, TRP1 found a distant interference (corresponding to step1 in the flowchart) whose interfering signals come from TRP2 and TRP 3.

In fig. 16-step 2, TRP1 sends a far-end base station interference sounding RS (first RS for short) in 2 downlink OFDM symbols before GP according to its own frame structure (corresponding to step 5 in the flowchart); TRP2 and TRP3 listen for a first RS in at least one uplink OFDM symbol after GP according to its own frame structure (corresponding to step 6 in the flowchart).

The TRP3 monitors the first RS in the third uplink OFDM symbol after GP farthest, and reports the monitoring result to the wide area SON. However, the TRP2 cannot listen to the first RS sent by the TRP1, so the TRP2 does not report the listening result to the wide-area SON.

In fig. 16-step 3, the wide-area SON configures TRP2 and TRP3 to perform an interference back-off operation based on interference measurement results reported by TRP2 and TRP 3. In particular, since TRP2 does not report interference measurement results to the wide-area SON, the wide-area SON does not configure TRP2 for interference fallback operations. And the TRP3 reports to the wide-area SON that it listened to the first RS in the third uplink OFDM symbol after GP, so the wide-area SON does not configure the TRP3 to backoff 3 downlink OFDM symbols.

However, from the final operational effect of fig. 16-step 3, it can be seen that TRP2 still causes far-end interference to UL transmission of TRP1 due to its DL signal since no interference back-off operation is performed. And the TRP2 backs off 1 more downlink OFDM symbol, although the TRP2 will not cause further remote interference to the TRP1 after performing the interference back-off operation, the back-off operation is not the most efficient because some downlink OFDM symbols are backed off.

In the above embodiment of the present invention, as shown in fig. 13, after the TRP2 and TRP3 perform the back-off, the TRP1 will not be interfered remotely.

The information transmission method further comprises the following steps:

In the information transmission method, the reporting signaling further includes at least one of the following information:

The information transmission method further comprises the following steps:

The information transmission method further comprises the following steps: and sending a network management unit feedback signaling to at least one first base station, wherein the feedback signaling is used for informing the first time length.

It should be noted that the base station may be any base station in a heterogeneous network system, and all the implementations of the methods shown in fig. 9 to fig. 13 are applicable to the embodiment of the base station, and the same technical effect can be achieved.

It should be noted that the network management unit may be a network management unit in a heterogeneous network system, and all the implementations of the methods shown in fig. 9 to fig. 13 are applicable to the embodiment of the network management unit, and the same technical effect can be achieved.

An embodiment of the present invention further provides a communication device, including: a processor, a memory storing a computer program which, when executed by the processor, performs the method as described above. The processor and the memory are connected through a bus or an interface. The communication device may be a network device, such as a base station, or a network management unit.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. An information transmission method applied to a base station, comprising:

the base station determines a reference frame structure;

2. The information transmission method according to claim 1,

3. The information transmission method according to claim 2, wherein the not-sending downlink data further comprises:

4. The information transmission method according to claim 1, wherein when the base station determines the first downlink transmission resource set, if a distance from a last downlink OFDM symbol to the first reference point is greater than or equal to a first duration, the first downlink transmission resource set is set as an empty set; otherwise, the first downlink transmission resource set is set to at least comprise one continuous downlink OFDM symbol, and the distance between the first OFDM symbol in the first downlink transmission resource set and the first reference point is ensured to be larger than or equal to the first duration.

5. The information transmission method according to claim 4, wherein before the base station determines the first set of downlink transmission resources, further comprising:

6. The information transmission method according to claim 5, wherein the reference frame structure further comprises: a second reference point.

7. The information transmission method according to claim 6, wherein before the base station determines the first time length, the method further comprises:

8. The information transmission method according to claim 1 or 6, wherein the base station determines the reference frame structure according to at least one of a predefined method, a network management unit configuration, and an inter-base station signaling indication.

9. The information transmission method according to claim 8, wherein the base station receives at least one of the following indication information when determining the reference frame structure by at least one of network management unit configuration and inter-base station signaling indication:

10. The information transmission method according to claim 8, wherein the base station receives at least one of the following indication information when determining the reference frame structure by at least one of network management unit configuration and inter-base station signaling indication:

11. The information transmission method according to claim 10, wherein determining the reference frame structure according to at least one of the following methods comprises:

12. The information transmission method according to claim 7,

the base station listens for the first reference signal starting from the second reference point.

13. The information transmission method of claim 12, wherein the base station listens for the first reference signal for a fifth duration from the second reference point.

14. The information transmission method according to claim 13,

the base station determines a fifth time length through presetting; or,

15. The information transmission method according to claim 1, wherein the base station transmits the second reference signal in a time interval [ first reference point-sixth time duration, first reference point ], wherein the sixth time duration is a time domain length of the second reference signal.

16. The information transmission method according to claim 15,

the base station determines a sixth time length through presetting; or,

17. The information transmission method according to claim 12, wherein the base station listens for the first reference signal in a plurality of consecutive or non-consecutive reference frames.

18. The information transmission method according to claim 5, wherein the base station determines the first time duration according to the second time duration, further comprising:

19. The information transmission method according to claim 1, further comprising:

20. The information transmission method according to claim 19, wherein the reporting signaling further includes at least one of the following information:

21. The information transmission method according to claim 20,

when the reporting signaling comprises the receiving power of the first reference signal, the base station determines the unit of the receiving power of the first reference signal through at least one indicating method of pre-specification, network management unit configuration and signaling between base stations;

22. An information transmission method applied to a network management unit is characterized by comprising the following steps:

23. The information transmission method according to claim 22, further comprising:

24. The information transmission method according to claim 23, wherein the reporting signaling further includes at least one of the following information:

25. The information transmission method according to claim 23, further comprising:

26. The information transmission method according to claim 23, further comprising:

27. The information transmission method of claim 26, wherein before the at least one first base station sends the network management unit feedback signaling, further comprising:

28. A base station, comprising:

29. A network management unit, comprising:

30. A communication device, comprising: a processor, a memory storing a computer program which, when executed by the processor, performs the method of any of claims 1-21 or the method of any of claims 22-27.

31. A computer-readable storage medium comprising instructions that, when executed on a computer, cause the computer to perform the method of any of claims 1-21 or the method of any of claims 22-27.