Disclosure of Invention
In order to solve the above technical problems, the present invention provides a method and an apparatus for measuring offset calibration information between multiple APs, which calibrate offsets existing in different APs and improve system performance.
In order to achieve the purpose, the invention adopts the technical scheme that: a method of measuring offset calibration information between a plurality of access points, comprising:
determining an offset calibration strategy at the base station side;
performing deviation calibration information measurement parameter configuration on the user side according to the deviation calibration strategy;
and the base station side performs offset calibration among the plurality of access points according to the measurement result of the offset calibration information returned by the user side.
Further, before the step of performing offset calibration between multiple access points according to a measurement result of offset calibration information returned by the user side, the base station side further includes:
and when the base station side meets a first deviation calibration preset condition, sending a signaling for measuring deviation calibration information among the plurality of access points to the user side to trigger the user side to measure the deviation calibration information.
Further, the first offset calibration preset condition includes: the base station side performs multipoint transmission and reception with the user side through a plurality of access points, and each access point is precoded independently;
or, the base station side performs multipoint transmission and reception with the user side through a plurality of access points, and when the sent downlink data parameter meets a second offset calibration preset condition, where the offset calibration preset condition includes:
the block error rate of the downlink data is greater than a first preset value, and the throughput of the downlink data is less than a second preset value.
Further, before the step of performing offset calibration between multiple access points by the base station side according to the measurement result of the offset calibration information returned by the user side, the method includes:
and the base station side sends a signaling for returning the measurement result of the deviation calibration information to the user side, and triggers the user side to report the measurement result of the deviation calibration information.
Further, the signaling is sent through a radio resource control or physical layer downlink control channel.
Further, the offset calibration information includes phase calibration information and/or delay differences, and the delay differences include channel delay differences and/or timing synchronization offsets between multiple access points.
Further, the offset calibration strategy is as follows:
a first strategy, in which a user terminal measures the phase calibration information, the channel delay difference and the timing synchronization deviation; or
A second strategy, a user side measures the phase calibration information, and a base station side measures the channel time delay difference and the timing synchronization deviation; or
A third strategy is that a user side measures the channel time delay difference and the timing synchronization deviation, and a base station side measures the phase calibration information; or
A fourth strategy, a user side measures the channel time delay difference, and a base station side measures the timing synchronization deviation and the phase calibration information; or
And a fifth strategy, wherein a user terminal measures the timing synchronization deviation, and a base station side measures the channel time delay difference and the phase calibration information.
Further, the offset calibration policy is the second policy, and the step of performing, by the base station side, offset calibration between the plurality of access points according to a measurement result of offset calibration information returned by the user side includes:
the base station side measures the channel time delay difference and the timing synchronization deviation;
and the base station side carries out deviation calibration according to the measurement result of the deviation calibration information returned by the user side, the measurement result of the channel time delay difference and the timing synchronization deviation.
Further, the offset calibration policy is the third policy, and the step of performing, by the base station side, offset calibration between the plurality of access points according to a measurement result of offset calibration information returned by the user side includes:
the base station side measures the phase calibration information;
and the base station side carries out deviation calibration according to the measurement result of the deviation calibration information returned by the user side and the measurement result of the phase calibration information.
Further, the offset calibration policy is the fourth policy, and the step of performing, by the base station side, offset calibration between the plurality of access points according to a measurement result of offset calibration information returned by the user side includes:
the base station side measures the phase calibration information and the timing synchronization deviation;
and the base station side carries out deviation calibration according to the measurement result of the deviation calibration information returned by the user side, the phase calibration information and the measurement result of the timing synchronization deviation.
Further, the offset calibration policy is the fifth policy, and the step of performing, by the base station side, offset calibration between the plurality of access points according to a measurement result of offset calibration information returned by the user side includes:
the base station side measures the phase calibration information and the channel time delay difference;
and the base station side carries out deviation calibration according to the measurement result of the deviation calibration information returned by the user side and the measurement results of the phase calibration information and the channel time delay difference.
Further, the measurement parameters of the offset calibration information include a measurement bandwidth, a measurement quantity of the user side, a measurement mode, a measurement result reporting mode, and/or a measurement period and a feedback period.
Further, the measurement method includes:
when the base station side meets a first deviation calibration preset condition, triggering the user side to measure the deviation calibration information of the plurality of access points through signaling for measuring the deviation calibration information sent to the user side; or,
the user side periodically measures deviation calibration information; or,
when the base station side meets the first deviation calibration preset condition, the user side is triggered to start to measure the periodic deviation calibration information by sending a signaling for measuring the deviation calibration information of the plurality of access points to the user side.
Further, the reporting mode of the measurement result includes:
the base station side triggers the user side to report the deviation calibration information measurement result at one time by sending a signaling for returning the deviation calibration information measurement result to the user side; or
The user side periodically reports the deviation calibration information; or
And the base station side triggers the user side to start to report the deviation calibration information measurement result periodically by sending a signaling for returning the deviation calibration information measurement result to the user side.
The present invention also provides a device for measuring offset calibration information between a plurality of access points, comprising:
the deviation calibration strategy determining module is used for determining a deviation calibration strategy at the base station side;
the parameter configuration module is used for carrying out deviation calibration information measurement parameter configuration on the user side according to the deviation calibration strategy;
and the deviation calibration module is used for performing deviation calibration among the plurality of access points by the base station side according to the measurement result of the deviation calibration information returned by the user side.
Further, the method also comprises the following steps:
and the signaling sending module is used for sending a signaling for measuring the deviation calibration information among the plurality of access points to the user side to trigger the user side to measure the deviation calibration information when the base station side meets the first deviation calibration preset condition.
Further, the signaling sending module is further configured to send a signaling for returning the measurement result of the offset calibration information to the user side by the base station side, and trigger the user side to report the measurement result of the offset calibration information.
Further, the signaling is sent through a radio resource control or physical layer downlink control channel.
Further, the first offset calibration preset condition includes: the base station side performs multipoint transmission and reception with the user side through a plurality of access points, and each access point is precoded independently;
or, the base station side performs multipoint transmission and reception with the user side through a plurality of access points, and when the sent downlink data parameter meets a second offset calibration preset condition, where the offset calibration preset condition includes:
the block error rate of the downlink data is greater than a first preset value, and the throughput of the downlink data is less than a second preset value.
Further, the offset calibration strategy is as follows:
a first strategy, in which a user terminal measures the phase calibration information, the channel delay difference and the timing synchronization deviation; or
A second strategy, a user side measures the phase calibration information, and a base station side measures the channel time delay difference and the timing synchronization deviation; or
A third strategy is that a user side measures the channel time delay difference and the timing synchronization deviation, and a base station side measures the phase calibration information; or
A fourth strategy, a user side measures the channel time delay difference, and a base station side measures the timing synchronization deviation and the phase calibration information; or
And a fifth strategy, wherein a user terminal measures the timing synchronization deviation, and a base station side measures the channel time delay difference and the phase calibration information.
Further, the offset calibration policy is the second policy, and the offset calibration module further includes:
and the first measurement unit is used for measuring the channel time delay difference and the timing synchronization deviation at the base station side.
Further, the offset calibration policy is the third policy, and the offset calibration module further includes:
and the second measurement unit is used for measuring the phase calibration information at the base station side.
Further, the offset calibration policy is the fourth policy, and the offset calibration module further includes:
and the third measuring unit is used for measuring the phase calibration information and the timing synchronization deviation at the base station side.
Further, the offset calibration strategy is the fifth strategy, and the offset calibration module further includes:
and the fourth measurement unit is used for measuring the phase calibration information and the channel time delay difference at the base station side.
The invention has the beneficial effects that: the problem that when different access points send data to the UE at the same time, deviation exists among the access points is solved, accuracy of time delay difference calibration is improved, and therefore system performance and spectrum efficiency are improved.
Detailed Description
The structure and principle of the present invention will be described in detail with reference to the accompanying drawings, which are used for illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, the present embodiment provides a method for measuring offset calibration information between multiple access points, including:
determining an offset calibration strategy at the base station side;
performing deviation calibration information measurement parameter configuration on the user side according to the deviation calibration strategy;
and the base station side performs offset calibration among the plurality of access points according to the measurement result of the offset calibration information returned by the user side.
The CoMP technology improves the signal reception quality of the user equipment by means of cooperative transmission of user data by multiple access points of multiple cells or multiple access points of one cell, and reduces inter-cell interference, thereby effectively improving system capacity and edge user spectrum efficiency. And the deviation between multiple access points results in reduced system performance. Therefore, the above-mentioned offset existing in different AP points needs to be calibrated, and the timing synchronization of the AP point that obtains the transmission data is close to zero, the channel delay difference is close to zero, and the phase offset is close to zero, so that the performance of the system will be improved. The method for measuring offset calibration information among multiple access points provided by the embodiment solves the technical problem just above.
The configuration of the measurement parameters of the offset calibration information comprises a mode of measuring offset calibration by a user terminal, and the offset measurement of the user terminal to a plurality of access points can be performed without the triggering of an instruction issued by the base station side or can be performed after the triggering of the base station side.
In this embodiment, before the step of performing offset calibration between multiple access points by the base station side according to the measurement result of the offset calibration information returned by the user side, the method further includes:
and when the base station side meets a first deviation calibration preset condition, sending a signaling for measuring deviation calibration information among the plurality of access points to the user side to trigger the user side to measure the deviation calibration information.
The user terminal measures only when deviation calibration is needed on the base station side, and the burden of the user terminal is properly lightened.
The first offset calibration preset condition includes: the base station side performs multipoint transmission and reception with the user side through a plurality of access points, and each access point is precoded independently;
or, the base station side performs multipoint transmission and reception with the user side through a plurality of access points, and when the sent downlink data parameter meets a second offset calibration preset condition, where the offset calibration preset condition includes:
the block error rate of the downlink data is greater than a first preset value, and the throughput of the downlink data is less than a second preset value.
The base station side may determine whether offset calibration between multiple access points is required, and the determining of the first offset calibration preset condition that the offset calibration is required specifically includes:
the base station side can determine to perform offset calibration between each access point when scheduled for CoMP joint transmission and each AP point is used for independent precoding.
Or, after observing the actual effect of CoMP transmission for a period of time, for example, parameters such as the block error rate and throughput of the system, it may be determined whether to perform offset calibration between access points. For example, in the case of a fixed modulation and coding scheme, the block error rate of the system is higher than a certain threshold, such as 10%; or when the fixed block error rate is at a certain value, such as 10%, and the system throughput is lower than a certain threshold value in the vicinity. It is determined that an offset correction between access points is required.
The reporting mode of the measurement result of the offset calibration information by the user end is determined by the configuration of the measurement parameters of the offset calibration information, and can be periodical automatic reporting or reporting after receiving an instruction of the base station side.
In this embodiment, before the step of performing offset calibration between multiple access points by the base station side according to the measurement result of the offset calibration information returned by the user side, "the method includes:
and the base station side sends a signaling for returning the measurement result of the deviation calibration information to the user side, and triggers the user side to report the measurement result of the deviation calibration information.
The user end reports the deviation calibration information measurement result only when the base station side needs to perform deviation calibration, namely when the first deviation calibration preset condition is met, so that the base station side can perform deviation calibration conveniently, the system performance is improved, meanwhile, the user end does not need to report regularly, and the burden is reduced.
In this embodiment, the signaling is sent through a radio resource control or physical layer downlink control channel.
The offset calibration information includes phase calibration information and/or delay differences including channel delay differences and/or timing synchronization offsets between multiple access points.
The bias calibration strategy is:
a first strategy, in which a user terminal measures the phase calibration information, the channel delay difference and the timing synchronization deviation; or
A second strategy, a user side measures the phase calibration information, and a base station side measures the channel time delay difference and the timing synchronization deviation; or
A third strategy is that a user side measures the channel time delay difference and the timing synchronization deviation, and a base station side measures the phase calibration information; or
A fourth strategy, a user side measures the channel time delay difference, and a base station side measures the timing synchronization deviation and the phase calibration information; or
And a fifth strategy, wherein a user terminal measures the timing synchronization deviation, and a base station side measures the channel time delay difference and the phase calibration information.
The offset calibration policy is the second policy, and the step of performing offset calibration between multiple access points by the base station side according to the measurement result of the offset calibration information returned by the user side includes:
the base station side measures the channel time delay difference and the timing synchronization deviation;
and the base station side carries out deviation calibration according to the measurement result of the deviation calibration information returned by the user side, the measurement result of the channel time delay difference and the timing synchronization deviation.
The offset calibration policy is the third policy, and the step of performing offset calibration between multiple access points by the base station side according to the measurement result of the offset calibration information returned by the user side includes:
the base station side measures the phase calibration information;
and the base station side carries out deviation calibration according to the measurement result of the deviation calibration information returned by the user side and the measurement result of the phase calibration information.
The offset calibration policy is the fourth policy, and the step of performing offset calibration between multiple access points by the base station side according to the measurement result of the offset calibration information returned by the user side includes:
the base station side measures the phase calibration information and the timing synchronization deviation;
and the base station side carries out deviation calibration according to the measurement result of the deviation calibration information returned by the user side, the phase calibration information and the measurement result of the timing synchronization deviation.
The offset calibration policy is the fifth policy, and the step of performing offset calibration between multiple access points by the base station side according to the measurement result of the offset calibration information returned by the user side includes:
the base station side measures the phase calibration information and the channel time delay difference;
and the base station side carries out deviation calibration according to the measurement result of the deviation calibration information returned by the user side and the measurement results of the phase calibration information and the channel time delay difference.
In actual use, the setting of the offset calibration strategy is determined according to the function of the ue and the actual load.
The deviation calibration information measurement parameters comprise measurement bandwidth, measurement quantity of a user side, a measurement mode, a measurement result reporting mode, and/or a measurement period and a feedback period. The configuration of the offset calibration information measurement parameters includes one or both of them according to an offset calibration strategy.
The base station may perform measurement parameter configuration by RRC (radio resource control) signaling:
radio resource control Connection Establishment message (RRC Connection Establishment)
Radio resource control Connection Reconfiguration message (RRC Connection Reconfiguration)
Radio resource control Connection reestablishment message (RRC Connection Re-establishment)
The measurement parameters may be placed in the cell specific parameter RadioResourceConfigCommonSIB IE, i.e. multiple UEs in the cell are all involved in the measurement.
It can also be placed in the UE specific parameter RadioResourceConfigDedicated IE, i.e. let the specified UE or UEs participate in the measurement.
In both cases, when a plurality of UEs are involved in the measurement, operations such as statistical averaging, median, maximum and minimum values, etc. need to be performed on the base station side.
Wherein, the measurement bandwidth includes a sub-band and a wideband, and preferably, 1 bit can be used for representation, for example, 0 represents a sub-band, and 1 represents a wideband; or 0 for wideband and 1 for subband.
The measurement quantity to be measured by the terminal comprises:
delay inequality and phase calibration information;
phase calibration information;
the time delay difference comprises the channel propagation time delay difference and the timing synchronization deviation of the access point;
channel propagation delay difference;
timing synchronization deviation;
preferably, it can be represented by a 3-bit bitmap, e.g., 000 for no measurement; 111 indicates case a); 001 represents case b); 110 represents case c); 100 represents case d); 001 for case e).
The measurement mode comprises the following steps:
event-triggered one measurement: when the base station side meets a first deviation calibration preset condition, triggering the user side to measure the deviation calibration information of the plurality of access points through signaling for measuring the deviation calibration information sent to the user side; or,
and (3) periodic measurement: the user side periodically measures deviation calibration information; or,
event-triggered periodic measurements: when the base station side meets the first deviation calibration preset condition, a signaling for measuring deviation calibration information of a plurality of access points is sent to the user side to trigger the user side to start periodic deviation calibration information measurement, and the periodic deviation calibration information measurement can be finished after a certain period or continuously performed.
Preferably, 2 bits may be used for representation, e.g. 00 represents an event-triggered one measurement, an event-triggered one measurement; 01 denotes periodic measurement, periodic measurement; the case event triggered periodic measurements, time triggered periodic measurements are denoted by 10.
The reporting mode of the measurement result comprises the following steps:
event-triggered one-time reporting: the base station side triggers the user side to report the deviation calibration information measurement result at one time by sending a signaling for returning the deviation calibration information measurement result to the user side; or
And (3) reporting periodically: the user side periodically reports the deviation calibration information; or
Event-triggered periodic reporting: the base station side sends a signaling for returning the measurement result of the offset calibration information to the user side to trigger the user side to start to report the measurement result of the offset calibration information periodically, and the periodic measurement can be continued after a certain period.
Preferably, 2 bits can be used for representation, for example, 00 represents a reporting event triggered by a situation, a measurement event triggered by an event; 01, reporting and measuring the condition periodically; and 10 represents the periodic reporting triggered by condition events and the periodic measurement triggered by time.
And (3) measuring period: in the case that the measurement triggering mode is periodic measurement or event triggering periodic measurement, a reasonable measurement period needs to be set, and the period is determined by comprehensively considering measurement requirements and measurement burden of the UE. Preferably, 1 second, 1 minute, 5 minutes, 10 minutes, etc. can be used.
A feedback period: and under the two conditions that the measurement result reporting mode is periodic reporting or event-triggered periodic reporting, a reasonable reporting period needs to be set, and the period needs to comprehensively consider the correction requirement of the base station side and the reporting overhead of the UE. Preferably, 1 second, 1 minute, 5 minutes, 10 minutes, etc. can be used.
Preferably, the measurement triggering mode and the measurement result reporting mode can be matched as much as possible. For example: reporting the event-triggered primary measurement in an event-triggered primary reporting mode; reporting the periodic measurement in a periodic reporting mode; the event-triggered periodic measurement is reported in an event-triggered periodic reporting mode. The measurement period and the reporting period may also remain the same, so that the measurement and reporting may be performed sequentially in an orderly manner.
If the measurement period is not consistent with the reporting period, the method given in the following step 2 can be referred to for certain processing.
Step 1: the UE measures the deviation between the multiple access points according to the RRC signaling indication, which specifically includes:
the UE starts to measure the deviation calibration information once after receiving the measurement parameter configuration indicated by the RRC signaling and receiving event trigger (RRC signaling for measuring the deviation calibration information);
or, the UE configured to periodically measure starts to periodically measure the offset calibration information;
alternatively, a UE configured for event-triggered periodic measurements, upon receiving an event trigger, starts to perform offset calibration information measurements on a periodic basis.
The event trigger may be an RRC signaling trigger or a PDCCH trigger.
Step 2: UE side arrangement measuring result
After the UE finishes the measurement, the measurement result can be sorted to a certain extent according to the measurement triggering mode and the measurement period configuration.
Under the condition of event-triggered one-time measurement, the UE may directly use the single measurement result as the final measurement result.
Under the condition of periodic measurement or event-triggered periodic measurement, the UE can take the measurement result of the latest measurement period as the final measurement result; the measurement results of the previous measurement cycles may also be statistically processed, for example: averaging, taking the maximum value, the minimum value, the median value, etc., and taking the processing result as the final measurement result, the UE may continue such statistical processing in a window sliding manner.
Under the condition of periodic reporting or event-triggered periodic reporting, the UE can take the measurement result of the latest measurement period as the final measurement result; the UE may perform statistical processing on all measurement values obtained between two reporting periods, for example: averaging, taking the maximum value, the minimum value, the median value, etc., and taking the processing result as the final measurement result, the UE may continue such statistical processing in a window sliding manner.
And step 3: the RRC layer entity at the UE side feeds back the measurement result to the RRC layer entity at the base station side through RRC signaling
After the UE obtains the offset calibration information by measurement, the UE shall perform the filling of the measurement result according to the reporting mode and the reporting period configuration, and the measurement result is included in the measurement report message and sent to the network.
And 4, step 4: and the base station performs deviation calibration among a plurality of access points according to the measurement result obtained by the RRC layer entity.
If the UE measures the delay difference and the phase calibration information between the access points at the same time, the base station may directly use the measurement result reported by the UE to perform the offset correction.
If the UE only measures the phase calibration information, the base station side needs to carry out time delay difference measurement and then carry out deviation correction;
if the UE only measures the time delay difference, including the channel propagation time delay difference and the timing synchronization deviation of the access point, the base station needs to measure phase calibration information and then carries out deviation correction;
if the UE only measures the channel propagation delay difference, the base station needs to measure the timing synchronization deviation and the phase calibration information, and then perform deviation correction.
If the UE only measures the timing synchronization deviation, the base station needs to measure the channel propagation delay difference and the phase calibration information, and then perform deviation correction.
As shown in fig. 2, the present invention also provides an apparatus for measuring offset calibration information between a plurality of access points, including:
the deviation calibration strategy determining module is used for determining a deviation calibration strategy at the base station side;
the parameter configuration module is used for carrying out deviation calibration information measurement parameter configuration on the user side according to the deviation calibration strategy;
and the deviation calibration module is used for performing deviation calibration among the plurality of access points by the base station side according to the measurement result of the deviation calibration information returned by the user side.
Further, the method also comprises the following steps:
and the signaling sending module is used for sending a signaling for measuring the deviation calibration information among the plurality of access points to the user side to trigger the user side to measure the deviation calibration information when the base station side meets the first deviation calibration preset condition.
Further, the signaling sending module is further configured to send a signaling for returning the measurement result of the offset calibration information to the user side by the base station side, and trigger the user side to report the measurement result of the offset calibration information.
Further, the signaling is sent through a radio resource control or physical layer downlink control channel.
Further, the first offset calibration preset condition includes: the base station side performs multipoint transmission and reception with the user side through a plurality of access points, and each access point is precoded independently;
or, the base station side performs multipoint transmission and reception with the user side through a plurality of access points, and when the sent downlink data parameter meets a second offset calibration preset condition, where the offset calibration preset condition includes:
the block error rate of the downlink data is greater than a first preset value, and the throughput of the downlink data is less than a second preset value.
Further, the offset calibration strategy comprises:
a first strategy, in which a user terminal measures the phase calibration information, the channel delay difference and the timing synchronization deviation;
a second strategy, a user side measures the phase calibration information, and a base station side measures the channel time delay difference and the timing synchronization deviation;
a third strategy is that a user side measures the channel time delay difference and the timing synchronization deviation, and a base station side measures the phase calibration information;
a fourth strategy, a user side measures the channel time delay difference, and a base station side measures the timing synchronization deviation and the phase calibration information;
and a fifth strategy, wherein a user terminal measures the timing synchronization deviation, and a base station side measures the channel time delay difference and the phase calibration information.
Further, the offset calibration policy is the second policy, and the offset calibration module further includes:
and the first measurement unit is used for measuring the channel time delay difference and the timing synchronization deviation at the base station side.
Further, the offset calibration policy is the third policy, and the offset calibration module further includes:
and the second measurement unit is used for measuring the phase calibration information at the base station side.
Further, the offset calibration policy is the fourth policy, and the offset calibration module further includes:
and the third measuring unit is used for measuring the phase calibration information and the timing synchronization deviation at the base station side.
Further, the offset calibration strategy is the fifth strategy, and the offset calibration module further includes:
and the fourth measurement unit is used for measuring the phase calibration information and the channel time delay difference at the base station side.
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.