CN110602743B - Method for measuring characteristic parameters of downlink channel and user equipment - Google Patents
Method for measuring characteristic parameters of downlink channel and user equipment Download PDFInfo
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Abstract
The application provides a method and user equipment for measuring downlink channel characteristic parameters, wherein the method for measuring the downlink channel characteristic parameters comprises the following steps: the user equipment receives the signaling, and acquires the combination of multiple reference signal resources which are corresponding to the measured downlink channel characteristic parameters and meet the virtual co-location relation and the corresponding configuration information; and the user equipment measures the characteristic parameters of the downlink channel on the multiple reference signal resources meeting the virtual co-location relationship and reports the corresponding characteristic parameters of the downlink channel according to measurement configuration. The application also provides the user equipment. The method and the device have the advantages that the multiple reference signal resources are reasonably configured to meet the virtual co-location relationship, so that the UE can effectively improve the measurement precision of the UE on the downlink channel characteristic parameters on the premise of keeping reasonable complexity and power consumption.
Description
The application is a divisional application of a patent application with an application date of 2013, 18/01, an application number of 201310019984.3 and a title of 'a method and user equipment for measuring downlink channel characteristic parameters'.
Technical Field
The present application relates to the field of wireless communication technologies, and in particular, to a method and a user equipment for measuring downlink channel characteristic parameters.
Background
For the LTE Rel8/9/10 system, the cell common reference signal, the CSI-RS, the user-specific reference signal resource and the downlink data channel are all transmitted from the same transmission point, i.e. the signals are co-located. Since co-location, these signals have the same channel characteristics, and User Equipment (UE) usually performs channel characteristic estimation based on cell Common Reference Signal (CRS), such as estimation of doppler spread, delay spread, frequency synchronization, and time synchronization. In addition, the CRS is also used for measurement of measurement quantities supporting radio resource management, such as for supporting measurement of reference signal received power, reference symbol received quality, and the like.
Coordinated multipoint operation (CoMP), which is an important characteristic of the LTE system, can effectively improve the peak rate of the system and the throughput of users at the cell edge.
In CoMP, since a Transmission Point (TP) for transmitting downlink data is dynamically changed, different reference signal resources, downlink control channels, and downlink data channels may come from different transmission points. In this case, the downlink reference signal and the downlink data channel are no longer co-located, so that the original measurement of channel characteristics based on the cell common reference signal cannot work.
For the transmission of the Physical Downlink Shared Channel (PDSCH), multiple sets of parameters of virtual co-location (QCL) are defined by system signaling in the current standardization, with different sets corresponding to different virtual co-location hypotheses. Each virtual co-located set comprises a channel state indication reference signal (CSI-RS) resource used for measuring channel characteristic parameters. Meanwhile, the system indicates the virtual co-located set corresponding to the current downlink data channel through the downlink control signaling. And the UE carries out measurement of channel characteristic parameters (comprising time delay expansion, average gain, frequency offset, Doppler expansion, average time delay and the like) based on the single CSI-RS resource in each virtual co-site set.
The channel characteristics are measured by using the reference signal resources, and the measurement accuracy depends on the number of available resource elements in a resource block and the distribution of the reference signal resource sampling points in the time frequency domain. As shown in fig. 1, a CRS has 8 resource sampling points in one time-frequency resource block, while a CSI-RS has only 2 resource elements in one time-frequency resource block (under the condition of 2 antenna ports), and the number of sampling points is very small, which results in poor accuracy of measured channel characteristic parameters.
In the current standardization, it is proposed to use a user specific reference signal (DMRS) of the PDSCH to assist in estimating channel characteristic parameters, but the number of sampling points of the user specific reference signal is limited by the number of resource blocks occupied by the user specific reference signal currently deployed in downlink. Under the condition that the number of downlink user resources is small, the estimation accuracy is poor, and the channel characteristics cannot be effectively tracked. Meanwhile, since the user-specific reference signal is transmitted together with the downlink data and comes from different transmission points in different subframes, the user equipment cannot predict the channel characteristic parameters in advance, and needs to estimate in each downlink data subframe, which increases the complexity of implementation.
Therefore, an effective technical scheme is required to be provided to solve the technical problems that the accuracy of channel characteristic measurement is insufficient based on a single channel reference resource in a virtual co-located set, and for some channel characteristic parameters, the estimation range is small, and the requirements of a system cannot be met.
Disclosure of Invention
The present application aims to solve at least one of the above technical problems, so that a UE can accurately measure various downlink channel characteristic parameters while maintaining low power consumption and complexity.
The embodiment of the application provides a method for measuring the characteristic parameters of the downlink channel on one hand, which comprises the following steps:
the method comprises the steps that user equipment receives a signaling, and acquires a combination of multiple reference signal resources meeting a virtual co-location relation and configuration information of the multiple reference signal resources from the signaling;
the user equipment measures the characteristic parameters of the downlink channel on the multiple reference signal resources meeting the virtual co-location relationship;
and the user equipment reports the measured downlink channel characteristic parameters according to the measurement configuration.
Another aspect of the embodiments of the present application further provides a user equipment, which includes a receiving module, a measuring module, and a sending module, where:
the receiving module is used for receiving a signaling sent by a base station and acquiring the combination of multiple reference signal resources meeting the virtual co-location relation and configuration information thereof from the signaling;
the measurement module is configured to measure downlink channel characteristic parameters on the multiple reference signal resources satisfying the virtual co-location relationship;
and the sending module is used for reporting the measured downlink channel characteristic parameters to the base station according to the measurement configuration.
The scheme provided by the application provides a scheme for enabling the UE to estimate and measure various channel characteristic parameters based on the multiple reference signal resources in the virtual co-location by reasonably selecting and configuring the multiple reference signal resources in each virtual co-location set. The multiple reference signal resources in the virtual co-located set may be configured multiple CSI-RS resources, demodulation reference signal resources (DMRSs) corresponding to multiple enhanced control channel sets (epdcchs), or a combination of single or multiple CSI-RS resources and demodulation reference signal resources (DMRSs) of single or multiple epdcchs sets. According to the scheme, the granularity of reference signal resource elements for measuring the channel characteristic parameters in a time-frequency domain is increased by configuring multiple reference signal resources in each virtual co-located set, and meanwhile, the multiple reference signal resources are reasonably configured to be combined, so that the precision of the UE for measuring the channel characteristic parameters is effectively improved, and the estimation range of the channel characteristic parameters which can be estimated by the UE is also improved. In addition, the scheme provided by the application has the advantages that the change of the existing system is small, the compatibility of the system cannot be influenced, and the implementation is simple and efficient.
Drawings
Fig. 1 is a resource diagram of a cell common reference signal (port 0) and a single CSI-RS (port 15) under a conventional single antenna port;
fig. 2 is a schematic diagram of a mapping pattern of CSI-RS resources under a conventional 2-antenna port (port15/port 16);
fig. 3 is a flowchart illustrating a method for measuring channel characteristic parameters based on multiple virtual co-located reference signal resources according to an embodiment of the present disclosure;
FIG. 4 is a diagram illustrating combining multiple virtual co-siting of reference signal resources by selecting different CSI-RS resource configurations according to the present application;
FIG. 5 is a schematic diagram of combining multiple CSI-RS resource virtual co-siting by selecting different CSI-RS subframe configurations according to the present application;
fig. 6 is a schematic diagram of combining and configuring multiple reference signal resources by selecting a single CSI-RS resource and a demodulation reference channel resource of an ePDCCH set;
fig. 7 is a schematic diagram of combining and configuring multiple virtual co-siting reference signal resources by selecting multiple CSI-RS resources and demodulation reference signal resources of an ePDCCH set according to the present application;
fig. 8 is a schematic structural diagram of a user equipment UE according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below with reference to the accompanying drawings and examples.
The application provides a method for configuring multiple reference signal resources in a virtual co-located set so as to improve the measurement accuracy of downlink channel characteristic parameters.
In this application, the combination of "multiple" reference signal resources includes two meanings: on one hand, a plurality of reference signal resources of the same type can be combined; alternatively, one or more reference signal resources of multiple different types may be combined.
Specifically, the main idea of the present application is: firstly, a base station configures a plurality of reference signal resources to be issued at the same TP, so that the reference signal resources satisfy a virtual co-location relationship to form a virtual co-location set, then, the base station issues the combination and configuration information of the plurality of reference signal resources in the same virtual co-location set to UE through a high-level signaling, so that the UE acquires the combination and configuration information of the plurality of reference signal resources satisfying the virtual co-location relationship, and measures downlink channel characteristic parameters on the plurality of reference signal resources.
The configured multiple reference signal resources meeting the virtual co-location relationship can be multiple CSI-RS resources, demodulation reference signal (DMRS) resources of multiple ePDCCH sets, or a combination of multiple or single CSI-RS resources and DMRS resources of multiple or single ePDCCH sets. Fig. 2 shows a schematic diagram of a mapping pattern of CSI-RS resources in a subframe under 2 ports in the prior art. As can be seen from the numbers in the figure: there are 20 different configurations of CSI-RS resources, each CSI-RS resource has only 2 resource elements in one resource block.
In order to achieve the purpose of the present application, an embodiment of the present application provides a method for measuring a characteristic parameter of a downlink channel by using multiple virtual co-located reference signal resources, including the following steps: the user equipment receives a signaling for configuring multiple reference signal resources meeting the virtual co-location relationship; the user equipment obtains the combination of the virtual co-located reference signal resources corresponding to the measured downlink channel characteristic parameters and the corresponding configuration information thereof according to the signaling; the user equipment adopts the multiple reference signal resources meeting the virtual co-location relationship to measure the characteristic parameters of the downlink channel; and the user equipment receives the downlink control information and the downlink data sent by the base station according to the measured downlink channel characteristic parameters, and reports the measured downlink channel characteristic parameters according to the configuration of the base station.
As shown in fig. 3, a flowchart of a method for measuring a downlink channel characteristic parameter by using virtual co-located multiple reference signal resources according to an embodiment of the present application includes the following steps:
s110: the user equipment receives a signaling, and the signaling indicates the multiple reference signal resource combination which is corresponding to the measured channel characteristic parameter and meets the virtual co-location relation and the corresponding configuration information. Hereinafter, the "combination of multiple reference signal resources satisfying the virtual co-location relationship" may also be referred to as "multiple reference signal resources in the virtual co-location set".
In this step, the base station may send the signaling to the user equipment through a radio resource configuration message or control information.
In this step, the combination mode of the multiple reference signal resource combinations satisfying the virtual co-location relationship may be simultaneously adopted in any one or more of the following modes:
the first combination mode is a frequency domain combination mode, and the multiple channel reference resources are configured to meet a virtual co-location (QCL) relationship, that is, multiple CSI-RS resources are selected to be combined through CSI-RS resource configuration (CSI-RS configuration). For example: in the example shown in fig. 4, CSI-RS resources with reference signal resource configurations of 0 and 2 are selected for combination.
And in the second combination mode, a time domain combination mode is adopted, multiple CSI-RS resources are configured to meet the QCL relationship, namely, reference signal resources of different subframes are selected to be combined through CSI-RS subframe configuration (CSI-RS subframe configuration). For example: in the example shown in fig. 5, reference signal resources of reference signal subframe configurations 15,16,17 in different subframes are selected for combination.
And a combination mode III, configuring the CSI-RS resource and the DMRS resource of the ePDCCH set to meet the QCL relationship. Compared with the method for enhancing the QCL measurement accuracy by using the DMRS for dynamically scheduling the PDSCH, in the combination mode, the configuration of the ePDCCH set (such as the indexes of the occupied PRB pairs) is configured in a semi-static mode through high-level signaling. The UE can know that the DMRS channel which can be used for enhancing the characteristic measurement precision of the QCL channel exists in some time-frequency positions of a radio frame, so that the robustness of QCL measurement is ensured. Here, the ePDCCH set used to enhance the QCL channel characteristic measurement accuracy is generally a distributed ePDCCH set. The DMRS of the distributed ePDCCH set is shared by multiple UEs, the transmission power of the DMRS is usually constant on each PRB pair, and the DMRS are set according to the UE with the worst channel quality, which is beneficial to improve the QCL measurement accuracy.
The distributed ePDCCH set introduced here may be just to enhance the accuracy of QCL channel characteristic measurement using its DMRS, without requiring that the UE must simultaneously use this ePDCCH set to detect epdcchs scheduling uplink and downlink transmissions. In the existing standard, at most 4 QCL hypotheses are supported for PDSCH, but the UE detects only two ePDCCH sets at most, so that according to the third combination method of the present application, there must be a distributed ePDCCH set which can be used to enhance the accuracy of the UE in measuring the QCL channel characteristics, but the UE is not configured on the distributed ePDCCH set to detect the ePDCCH. In fact, the 4 distributed ePDCCH sets configured to enhance the accuracy of the QCL channel characteristics measurements may be completely different from the ePDCCH sets in which the UE detects epdcchs. That is, there are actually at most 6 ePDCCH sets for one UE, and on 4 of the distributed ePDCCH sets, the UE only needs to measure its DMRS to obtain QCL channel characteristics, and the other two ePDCCH sets need to detect both a DMRS and an alternative ePDCCH channel. For one QCL parameter set, the distributed ePDCCH set enhancing the measurement accuracy of the QCL channel characteristics may also be an ePDCCH set configured by the UE to detect an ePDCCH. Thus, the number of ePDCCH sets actually detected by the UE is correspondingly reduced.
The third combination method will be described below with reference to two examples.
As shown in fig. 6,1 CSI-RS resource (resource configuration 0) and DMRS resources corresponding to the distributed ePDCCH set satisfy the QCL relationship, and further assuming that the distributed ePDCCH set includes 4 PRB pairs, the essence is to enhance the QCL channel characteristic accuracy measured by using the CSI-RS resource (resource configuration 0) by using DMRS ports 107 and 109 on the 4 PRB pairs of the distributed ePDCCH set.
As shown in fig. 7, 2 CSI-RS resources (resource configurations 0 and 2) and DMRS resources of the distributed ePDCCH set satisfy the QCL relationship, and further assuming that the distributed ePDCCH set includes 4 PRB pairs, it is essential to enhance the precision of the QCL channel characteristics measured by the CSI-RS resources (resource configurations 0 and 2) by using DMRS ports 107 and 109 on the 4 PRB pairs of the distributed ePDCCH set.
In step S110, when selecting the multiple CSI-RS resources satisfying the virtual co-location relationship, the selection method may be any one of the following:
and in the first selection mode, the CSI-RS resources are randomly selected from the selectable CSI-RS resources to be combined.
And selecting a second selection mode, namely selecting the CSI-RS resources which have stronger correlation characteristics and are on different time domain symbols to combine according to the requirement of measuring the channel characteristic parameters and the correlation characteristics of the time frequency domain of the channel.
As shown in fig. 4, if the time-frequency domain correlation is considered, resources with different time domains and adjacent frequencies are selected to be combined in the same subframe, for example, CSI-RS resources with reference signal resource configurations of 0 and 2 are combined.
As shown in fig. 5, if the time-frequency domain correlation is considered, CSI-RS resources having the same periodicity and being adjacent in the time domain are selected by selecting CSI-RS subframe configurations between different subframes, e.g., selecting reference signal resources of reference signal subframe configurations 15,16,17 to be combined, such that the reference signal resources within the combination are in adjacent subframes 0,1, 2.
In step S110 of the present application, the ue may assume that the multiple reference signal resources in the obtained virtual co-located set are consistent for one or more of the following channel characteristic parameters:
time delay expansion;
average gain;
frequency shifting;
doppler spread;
and averaging the time delay.
The signaling in step S110 of the present application should contain one or more of the following information:
1) the number of CSI-RSs within a combination, i.e.: size of multiple CSI-RS resource combinations.
2) Combining resource configurations of the intra-CSI-RS. The signaling can give a specific configuration combination, such as combining CSI-RS resources with {0,2} representing the selected resource configuration as 0,2 in the signaling; all of them can be used from the perspective of saving signaling overheadThe resource configurations of the rows are combined, numbered and the corresponding numbers are indicated. For the case of 1 antenna port or 2 antenna port (1/2 antenna port for short), when the combination size is 2, it will be considered that there will be all combinations traversed
A combination of which can be made
The combinations are numbered or a subset thereof is selected for numbering according to the requirements of channel correlation and measurement. The following is illustrated by table 1.
Table 1 lists a list of partial resource combination subsets for the combination size of 2 with 1/2 antenna ports.
TABLE 1
According to table 1, assuming that the combination number received by the ue is 0, it can be known that the resource configuration combination in the current combination is {0,1 }.
3) Combining subframe configurations of intra-channel reference resources. The signaling may give a specific combination of configurations such as {15,16,17} representing the combination of resources with a selected subframe configuration of {15,16,17} or a starting subframe configuration with a combined size and resources within the combination, such as: the combination size is 3 and the starting subframe configuration is 15, i.e. the set of available subframe configurations is 15,16, 17.
4) The indication information of the virtually co-located ePDCCH set comprises PRB pair indexes contained in the ePDCCH set, initialization values of DMRS sequences and the like.
S120: and the user equipment obtains the combination of the reference signal resources which are corresponding to the characteristic parameters of the measured downlink channel and meet the virtual co-location relation and the corresponding configuration information thereof according to the received signaling.
In this step, the manner in which the ue obtains the combination and the corresponding configuration information thereof depends on the manner in which the signaling in step S110 carries the corresponding information. Specifically, the combination of multiple reference signal resources and their corresponding configuration information can be obtained in several ways as follows.
The first obtaining method comprises the following steps: and defining a table according to the specification, giving the combination size and the predefined resource combination number by signaling, and searching the predefined table by the user equipment according to the signaling to obtain the specific configuration information of the multiple reference signal resources in the combination. For example: according to table 1, the ue receives the combination number of 2 and the combination size of 2, so that it can know that the resource configuration combination in the current combination is {0,2 }.
The second obtaining method comprises the following steps: the specific combination is given through signaling, and the user equipment receives the signaling to obtain the configuration of the multiple reference signal resources in the combination.
S130: and the user equipment measures the characteristic parameters of the downlink channel according to the multiple reference signal resources utilizing the virtual co-location.
In this step, the ue may measure the downlink channel characteristic parameters by using multiple reference signal resources satisfying the virtual co-location relationship. The channel characteristic parameters that can be measured include one or more of:
time delay expansion;
average gain;
frequency shifting;
doppler spread;
averaging the time delays;
channel quality information;
a reference signal received power;
reference signal received quality.
S140: and receiving downlink control information and downlink data sent by the base station according to the measured downlink channel characteristic parameters, and reporting the measured downlink channel characteristic parameters according to the configuration of the base station.
Corresponding to the above method, an embodiment of the present application further provides a user equipment as shown in fig. 8, where the user equipment includes a receiving module 110, a measuring module 120, and a sending module 130, where:
a receiving module 110, configured to receive a signaling sent by a base station, and obtain a combination of multiple reference signal resources satisfying a virtual co-location relationship and corresponding configuration information from the signaling;
a measurement module 120, configured to measure downlink channel characteristic parameters on the multiple reference signal resources satisfying the virtual co-location relationship;
a sending module 130, configured to report the measured downlink channel characteristic parameters to the base station according to the measurement configuration.
Preferably, the multiple reference signal resources satisfying the virtual co-location relationship refer to: the multiple reference signal resources are consistent for one or more channel characteristic parameters: delay spread, average gain, frequency offset, doppler spread, average delay;
the measurement module is used for measuring one or more of the following downlink channel characteristic parameters: delay spread, average gain, frequency offset, doppler spread, average delay, channel quality information, reference signal received power, reference signal received quality.
The combination method of the multiple reference signal resource combinations that satisfy the virtual co-location relationship and are obtained by the receiving module may be combined according to the three combination methods, and when selecting multiple CSI-RS resources for combination, the combination method may be selected according to the two selection methods, which is not described herein again.
The method or the device provided by the application provides a scheme for enabling the UE to estimate and measure various channel characteristic parameters based on the multiple reference signal resources in the virtual co-location by reasonably selecting and configuring the multiple reference signal resources in each virtual co-location set. Meanwhile, by configuring multiple reference signal resources, the range of channel characteristic parameters which can be processed by the user equipment is increased, sufficient measurement accuracy can be ensured when the measurement bandwidth is small, the UE is prevented from measuring in an overlarge measurement bandwidth and measuring downlink channel characteristic parameters for a long time, and the complexity of a system and the power consumption of the user equipment are effectively guaranteed. In addition, the scheme provided by the application has the advantages that the change of the existing system is small, the compatibility of the system cannot be influenced, and the implementation is simple and efficient.
To facilitate an understanding of the present application, further description is provided below with reference to the accompanying drawings and by way of example of specific application scenarios.
The application scene one: the multiple reference signal resources configured by the virtual co-located set are: multiple CSI-RS resources are configured, and the multiple CSI-RS resources are configured under the same subframe configuration.
As shown in fig. 2 and fig. 4, the present application scenario describes that the multiple reference signal resource combinations configured by the base station and satisfying the virtual co-location relationship are implemented by selecting different CSI-RS resources under the same subframe.
Step 1: and the base station informs the UE of the configuration of the multiple reference signal resource combination in the currently configured virtual co-located set through system information. The specific signaling content is as follows:
number of CSI-RS resources within a combination: 2;
CSI-RS resource configuration within a combination: specific configurations 0 and 2 may be given or a list number of combinations, such as number 2 in table 1, may be given.
Step 2: the UE receives configuration information about the resource combination of the multi-channel reference channel, and knows the current resource configuration {0,2} of the multi-CSI-RS according to the system information.
And 3, step 3: the UE operates resource elements at corresponding resource positions according to the obtained resource allocation of the multiple reference signals, and measures a downlink channel characteristic parameter, which specifically includes: time delay expansion, average gain, frequency offset, Doppler expansion, average time delay, channel quality information, CSI-RS receiving power and CSI-RS receiving quality.
And 4, step 4: the method for reporting the measurement result of the downlink channel characteristic parameter by the UE in the measurement time comprises the following steps: channel quality information, CSI-RS received power, CSI-RS received quality.
Application scenario two: the configured multiple reference signal resources satisfying the virtual co-location relationship are combined into a single CSI-RS resource and a demodulation reference signal resource of an ePDCCH set, as shown in fig. 7.
The application scenario describes that a base station configures multiple types of reference signal resources for combined virtual co-location, and combines a single CSI-RS resource and an ePDCCH set.
Step 1: and the information of the multiple reference signal resource combination in the virtual co-located set currently configured by the base station is informed to the UE through system information. The specific signaling content is as follows:
CSI-RS configuration information in the virtual co-located set:
resource configuration of CSI-RS combination: 0;
the virtual co-located ePDCCH set indication information comprises PRB pair indexes contained in the ePDCCH set, initialization values of DMRS sequences and the like.
Step 2: and the UE receives configuration information about the virtual co-located multi-reference channel resource combination, acquires the resource configuration of the current virtual co-located CSI-RS to be 0 according to the system information, and simultaneously acquires the configuration information of the demodulation reference signal resource of the current virtual co-located ePDCCH set according to the indication of the virtual co-located ePDCCH set.
And 3, step 3: the UE operates resource elements at corresponding resource positions according to the obtained resource allocation of the multiple reference signals, and measures a downlink channel characteristic parameter, which specifically includes: time delay expansion, average gain, frequency offset, Doppler expansion, average time delay, channel quality information, CSI-RS receiving power and CSI-RS receiving quality.
And 4, step 4: and the UE reports the measurement result of the characteristic parameters of the downlink channel according to the measurement configuration in the measurement time.
Application scenario three: multiple reference signal resources satisfying the virtual co-located set are combined into multiple reference signal resources in different subframes, as shown in fig. 6. The application scenario describes that the base station selects to combine multiple reference signal resources in adjacent subframes. The corresponding signaling combination is: and indicating the size of the combination as a resource subframe configuration set corresponding to the combination to inform a user of the configuration information of the current multi-reference signal resource combination.
Step 1: and the information of the multi-reference signal resource combination of the virtual co-location currently configured by the base station is informed to the UE through system information. The specific signaling content is as follows:
number of antenna ports: 2;
number of CSI-RS resources within combination: 3;
combined CSI-RS resource configuration: 0;
combined CSI-RS resource subframe configuration set 15,16, 17.
Step 2: the UE receives configuration information about multiple reference signal resource combinations in the virtual co-located set, and knows that the resource configuration of the current multiple CSI-RS is 0 according to system information, a corresponding subframe is {0,1,2}, and the transmission period is 20 ms.
And 3, step 3: the UE operates resource elements at corresponding resource positions according to the obtained resource allocation of the multiple reference signals, and measures a downlink channel characteristic parameter, which specifically includes: time delay expansion, average gain, frequency offset, Doppler expansion, average time delay, channel quality information, CSI-RS receiving power and CSI-RS receiving quality.
And 4, step 4: and the UE reports the measurement result of the channel characteristic parameter in the measurement time.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.
Claims (18)
1. A method for measuring the characteristic parameters of a downlink channel is characterized by comprising the following steps:
the method comprises the steps that user equipment receives a signaling, and acquires a combination of multiple reference signal resources meeting a virtual co-location relation and configuration information of the multiple reference signal resources from the signaling; the multiple reference signal resources satisfying the virtual co-location relationship refer to: the multiple reference signal resources are consistent for one or more channel characteristic parameters: delay spread, average gain, frequency offset, doppler spread, average delay;
the user equipment measures the characteristic parameters of the downlink channel on the multiple reference signal resources meeting the virtual co-location relationship;
the combination of the multiple reference signal resources comprises: combining multiple reference signal resources of the same type, or combining one or more reference signal resources of different types;
the types of the reference signal resources include: and the channel state indication reference signal CSI-RS resource and/or the demodulation reference signal DMRS resource corresponding to the enhanced physical downlink control channel ePDCCH set.
2. The method of claim 1, wherein:
the measurement is to measure one or more of the following downlink channel characteristic parameters: delay spread, average gain, frequency offset, doppler spread, average delay, channel quality information, reference signal received power, reference signal received quality.
3. The method of claim 1, wherein the multiple reference signal resource combinations are combined in one or more of the following ways:
combining a plurality of CRI-RS resources in the same subframe by selecting different CRI-RS resource configurations;
combining CRI-RS resources of different subframes by selecting subframe configurations of different CRI-RS resources;
the single or multiple CRI-RS resources are combined with the DMRS resources of the single or multiple ePDCCH sets.
4. The method of claim 3, wherein at least one of the following principles is followed when combining CSI-RS resources:
randomly selecting among currently available CSI-RS resources;
and selecting reference signal resources with strong channel correlation characteristics and on different time domain symbols for combination.
5. The method of claim 4, wherein selecting CSI-RS resources with strong channel-related characteristics comprises at least one of:
selecting CSI-RS number resources which are on different time domain symbols and adjacent in frequency domain in the same subframe for combination;
and selecting the CSI-RS resources with adjacent subframe configurations in different subframes to combine.
6. The method of claim 3, wherein at least one of the following principles is followed when combining CSI-RS resources:
selecting CSI-RS number resources which are on different time domain symbols and adjacent in frequency domain in the same subframe for combination;
and selecting the CSI-RS resources with adjacent subframe configurations in different subframes to combine.
7. The method according to any of claims 1-6, wherein when combining CSI-RS resources, the selection resources are configured to combine CSI-RS resources at time domain symbol position l {5, 9 }.
8. The method of claim 1, wherein:
the ePDCCH set is a distributed ePDCCH set; or
The ePDCCH set is an ePDCCH set for configuring UE to detect ePDCCH; or the ePDCCH set is not an ePDCCH set for configuring the UE to detect the ePDCCH.
9. The method of claim 1, wherein the signaling includes one or more of the following information:
a size of a multiple CSI-RS resource combination;
the number corresponding to the multiple CSI-RS resource combinations;
a CSI-RS resource configuration set corresponding to the multiple CSI-RS resource combinations;
a CSI-RS subframe configuration set corresponding to the multiple CSI-RS resource combinations;
indication information of a virtual co-located ePDCCH set.
10. A user device, comprising: receiving module, measuring module and sending module, wherein:
the receiving module is used for receiving a signaling sent by a base station and acquiring the combination of multiple reference signal resources meeting the virtual co-location relation and configuration information thereof from the signaling; the multiple reference signal resources satisfying the virtual co-location relationship refer to: the multiple reference signal resources are consistent for one or more channel characteristic parameters: delay spread, average gain, frequency offset, doppler spread, average delay;
the measurement module is configured to measure downlink channel characteristic parameters on the multiple reference signal resources satisfying the virtual co-location relationship;
the combination of the multiple reference signal resources comprises: combining a plurality of reference signal resources of the same type, or combining one or more reference signal resources of different types;
the types of the reference signal resources include: the channel state indication reference signal CSI-RS resource and/or the demodulation reference signal DMRS resource corresponding to the enhanced physical downlink control channel ePDCCH set.
11. The user device of claim 10, wherein:
the measuring module is used for measuring one or more of the following downlink channel characteristic parameters: delay spread, average gain, frequency offset, doppler spread, average delay, channel quality information, reference signal received power, reference signal received quality.
12. The UE of claim 10, wherein the multiple reference signal resource combinations are combined in one or more of the following ways:
combining a plurality of CRI-RS resources in the same subframe by selecting different CRI-RS resource configurations;
combining CRI-RS resources of different subframes by selecting subframe configurations of different CRI-RS resources;
the single or multiple CRI-RS resources are combined with the DMRS resources of the single or multiple ePDCCH sets.
13. The user equipment of claim 12, wherein when combining CSI-RS resources, at least one of the following principles is followed:
randomly selecting among currently available CSI-RS resources;
and selecting reference signal resources with strong channel correlation characteristics and on different time domain symbols for combination.
14. The user equipment of claim 13, wherein the manner of selecting the CSI-RS resource with strong channel-related characteristics comprises at least one of:
selecting CSI-RS number resources which are on different time domain symbols and adjacent in frequency domain in the same subframe for combination;
and selecting the CSI-RS resources with adjacent subframe configuration in different subframes to combine.
15. The user equipment of claim 12, wherein when combining CSI-RS resources, at least one of the following principles is followed:
selecting CSI-RS number resources which are on different time domain symbols and are adjacent to each other in frequency domain in the same subframe for combination;
and selecting the CSI-RS resources with adjacent subframe configurations in different subframes to combine.
16. The user equipment according to any of claims 10-15, wherein when combining CSI-RS resources, the selection resources are configured to combine CSI-RS resources at time domain symbol position l {5, 9 }.
17. The user device of claim 10, wherein:
the ePDCCH set is a distributed ePDCCH set; or
The ePDCCH set is an ePDCCH set for configuring UE to detect ePDCCH; or, the ePDCCH set is not one ePDCCH set configuring the UE to detect the ePDCCH.
18. The user equipment of claim 10, wherein the signaling includes one or more of the following information:
a size of a multiple CSI-RS resource combination;
the number corresponding to the multiple CSI-RS resource combination;
a CSI-RS resource configuration set corresponding to the multiple CSI-RS resource combinations;
a CSI-RS subframe configuration set corresponding to the multiple CSI-RS resource combinations;
indication information of a virtual co-located ePDCCH set.
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