CN103428749B - A kind of descending multi-point signal mass measuring method and device - Google Patents

Abstract

The present invention is applicable to the technical field of wireless communication, and provides a downlink multi-point signal quality measurement method and device. The method includes: user equipment UE receives channel state information reference signal CSI-RS resource management sent by base station through radio resource control RRC signaling Set configuration information; UE demodulates the RRC signaling to obtain CSI-RS resource management set configuration information, and according to the CSI-RS antenna port number indicated in the CSI-RS resource management set configuration information, each CSI-RS The subframe configuration of the resource and the CSI-RS resource configuration are used to measure the reception quality RSRQ of the CSI-RS reference signal. The embodiments of the present invention can improve the CSI-RS for each downlink transmission point through the above technical solution? The measurement accuracy of RSRQ and the low implementation complexity also indirectly improve the spectral efficiency of the system.

Description

A downlink multi-point signal quality measurement method and device

technical field

The present invention relates to the field of communication technology, in particular to a downlink multi-point signal quality measurement method and device.

Background technique

Now the research and development of the wireless communication system is more and more evolving towards the direction of achieving higher spectrum efficiency. In order to achieve higher spectrum efficiency, one of the important directions is how to improve the spectrum efficiency under the condition of multi-cell co-frequency networking. In the downlink direction of multi-cell co-frequency networking, the downlink transmission points of each cell are sending downlink data for UEs (User Equipment, user equipment) in their own cells. The downlink signals will be superimposed on the UE side, thereby causing interference to the downlink reception of the UE. An effective way to solve the interference caused by multiple adjacent same-frequency transmission points to the UE in the downlink direction is to perform CoMP (Coordinated Multiple Points) operations on multiple different downlink transmission points, so that each different transmission point can reach The signals on the UE side can produce beneficial superposition, thereby producing corresponding receiving gain. To achieve the above purpose, the UE needs to measure the downlink signals transmitted by neighboring base stations of the same frequency, and then the UE reports the measured signal quality to the serving base station so that the serving base station can make correct CoMP choose. Therefore, how to accurately and effectively measure the quality of signals from different base stations under the same-frequency networking conditions with same-frequency interference is the basis for correct selection of cooperation points, and it is also one of the key factors to improve the downlink spectrum efficiency of multiple cells.

For how to measure the signal quality measurement under the condition of multi-cell co-frequency networking, the downlink channel state information CSI-RS (ChannelStateInformation-ReferenceSignal, Signal quality is measured at the OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) symbol position appearing in the channel state information reference signal.

Use the OFDM symbol positions that appear in the CSI-RS defined in LTE-A Release 10 to measure the signal quality. The main problem is that the densest occurrence of CSI-RS in LTE-A Release 10 is also 5ms once. The most rare is 80ms once, and one CSI-RS resource only occupies 2 OFDM symbols. Therefore, if the OFDM symbol positions appearing in the CSI-RS defined in release 10 are used to measure the signal quality, its accuracy cannot meet the requirements of downlink CoMP multi-point channel quality measurement.

Contents of the invention

Embodiments of the present invention provide a downlink channel state information measurement method, device, and user equipment, aiming to solve the problem of insufficient measurement accuracy caused by the large occurrence period of CSI-RS and sparser signals, and improve the CSI-RSRSRQ The measurement accuracy can provide effective measurement information for the signal quality measurement of the downlink multi-point transmission of the downlink CoMP.

On the one hand, a method for measuring downlink multipoint signal quality is provided, including:

The user equipment UE receives channel state information reference signal CSI-RS resource management set configuration information sent by the base station through radio resource control RRC signaling, and the CSI-RS resource management set configuration information includes: CSI-RS antenna port number, CSI-RS Resource configuration, and subframe configuration of each CSI-RS resource;

The UE demodulates the RRC signaling to obtain CSI-RS resource management set configuration information;

According to the CSI-RS resource configuration indicated by the CSI-RS resource management set configuration information, and the subframe configuration of each CSI-RS resource, the CSI-RS is obtained by measuring the antenna port corresponding to the CSI-RS antenna port number Reference signal received power RSRP measurement value;

Based on the measurement position indicated by network signaling, or based on the measurement position indicated by the UE high-level message, or based on the measurement method indicated by the UE high-level message, perform CSI-RS Received Signal Strength Indication RSSI measurement to obtain CSI-RS RSSI measurement value;

According to the formula RSRQ=N*RSRP/RSSI, the measured value of CSI-RSRSRQ is calculated, wherein, N is the number of resource blocks RB on the bandwidth where the received signal strength indicator RSSI is located, RSRP is the CSI-RSRSRP measured value, and RSSI is the CSI- RSRSSI measurement.

On the other hand, a downlink multi-point signal quality measurement device is provided, which is used for user equipment to measure the channel state information reference signal CSI-RS reference signal reception quality RSRQ, the device comprising:

The receiving unit is configured to receive CSI-RS resource management set configuration information sent by the base station through radio resource control RRC signaling, the CSI-RS resource management set configuration information includes: CSI-RS antenna port number, CSI-RS resource configuration, and the subframe configuration of each CSI-RS resource;

A demodulation unit, configured to demodulate the RRC signaling received by the receiving unit to obtain CSI-RS resource management set configuration information;

The first measurement unit is configured to use the antenna corresponding to the CSI-RS antenna port number according to the CSI-RS resource configuration indicated by the CSI-RS resource management set configuration information and the subframe configuration of each CSI-RS resource The port measurement obtains the reference signal received power RSRP measurement value of the CSI-RS;

The second measurement unit is configured to perform CSI-RS received signal strength indication (RSSI) based on the measurement position indicated by network signaling, or based on the measurement position indicated by the UE high-level message, or based on the measurement method indicated by the UE high-level message Measure to get the CSI-RSRSSI measurement value;

The calculation unit is used to calculate the measurement value of CSI-RSRSRQ according to the formula RSRQ=N*RSRP/RSSI, where N is the number of resource block RBs in the bandwidth where the received signal strength indicator RSSI is located, and RSRP is the measurement value of CSI-RSRSRP , RSSI is the measured value of CSI-RSRSSI.

In the embodiment of the present invention, by receiving the RRC signaling containing the CSI-RS resource management set configuration information sent by the base station, and according to the CSI-RS resource configuration indication in the RRC signaling and the subframe configuration information of the CSI-RS resource , measure the reception quality RSRQ of the CSI-RS reference signal at a specific position. Compared with the prior art that only measures the signal quality at the OFDM symbol position where the CSI-RS is located, the method provided by the present invention can be used in the CSI - When the density of RS is small, the measurement accuracy of CSI-RSRSRQ can be guaranteed, thereby improving the measurement accuracy of CSI-RSRSRQ of each downlink transmission point, and providing a more accurate report of the measurement signal quality for the base station, which is helpful Because the base station makes more effective judgments when selecting the CoMP cooperating set, it can improve the correct rate of CoMP transmitting set transmitting point selection, more effectively ensure the acquisition of CoMP gain, and thus improve the spectral efficiency of the system.

Description of drawings

FIG. 1 is a schematic diagram of an LTECoMP general system model provided by an embodiment of the present invention;

FIG. 2 is a schematic diagram of a resource block in a subframe structure using normalCP in an LTE system;

FIG. 3 is a flow chart of a downlink multipoint signal quality measurement method provided in Embodiment 1 of the present invention;

FIG. 4 is a flow chart of a method for measuring CSI-RS reference signal reception quality RSRQ provided by Embodiment 1 of the present invention;

FIG. 5a is a schematic diagram of CSI-RS ports 15 and 16 on one RB of a normalCP type subframe provided by Embodiment 1 of the present invention;

FIG. 5b is a schematic diagram of a single CSI-RS port 15 of a normalCP type subframe on one RB provided by Embodiment 1 of the present invention;

6 is a block diagram of a CRSRSSI measurement method provided by Embodiment 1 of the present invention;

FIG. 7 is a schematic diagram of two OFDM symbol positions where a CSI-RS appears in a normal subframe provided by Embodiment 1 of the present invention;

FIG. 8 is a flowchart of a method for measuring downlink multipoint signal quality according to another embodiment of the present invention;

FIG. 9 is a structural block diagram of an apparatus for measuring downlink multi-point signal quality according to Embodiment 2 of the present invention.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

The realization of the present invention is described in detail below in conjunction with specific embodiment:

Embodiment one

The embodiment of the present invention provides a method for measuring downlink multi-point signal quality. This method is typically applied in an LTE communication system. In an LTE communication system, data transmission can be divided into uplink transmission and downlink transmission. Uplink means that the sender is a user terminal The UE, the receiver is the base station (eNB: evolved NodeB B); the downlink transmission means that the sender is the base station, and the receiver is the user terminal. FIG. 1 is a schematic diagram of the CoMP working mode of the LTE system provided by the embodiment of the present invention. It can be seen from FIG. 1 that in the CoMP mode, multiple base stations cooperate to provide communication services for multiple users (ie, mobile stations) at the same time, and each user The data streams of multiple antennas can be received, and at the same time, each user can independently receive different data streams, so a relatively high throughput can be achieved.

Downlink CoMP needs to measure the signal quality of multiple downlink transmission points. The physical resource required for these measurements is CSI-RS (ChannelStateInformation-ReferenceSignal channel state information reference signal), and the parameter of signal quality to be measured is RSRP (ReferenceSignalReceivedPower Reference Signal Received Power) and RSRQ (ReferenceSignalReceivedQuality Reference Signal Received Quality), abbreviated as CSI-RSRSRP and CSI-RSRSRQ. RSRP is a strength value of received signal power on a specific reference signal, and RSRQ is a signal quality value defined on a specific reference signal.

In LTE-A version 10, the method of CRS for channel quality measurement is defined. This method is mainly performed on port 0 of CRS. As shown in Figure 2, it is one of the subframe structures using normalCP in the LTE system. Schematic diagram of RB (ResourceBlock, resource block). The CSI-RS signal identifying Port0 appears on some subcarriers in OFDM symbols 0 and 4 in slot 0 and slot 1 . That is, the CRS RSRP of mobility management is measured on the CSI-RS signal on port 0 as shown in Figure 1. If the UE can detect CRS port 1, it can perform RSRP measurement on port 0 and port 1 at the same time, otherwise By default, RSRP measurements are performed on port 0. To measure the value of CRSRSRQ, you only need to measure the value of CRSRSSI. The value of CRSRSSI is defined on OFDM symbol 0 and symbol 4 of time slot 0 and time slot 1 shown in the above figure.

In addition, in LTE-A Release 10, CSI-RS is also defined for channel quality measurement. In the research of Release 11, it has been considered to use CSI-RS configuration methods similar to Release 10 to do more types of measurements. It includes using non-zero CSI-RS resources to measure the signal quality (CSI-RSRSRP and CSI-RSRSRQ) of downlink CoMP transmission multipoints. Ports 15-22 where the CSI-RS reference signal appears, the OFDM symbol positions appearing in the normalCP (normal cyclic prefix) are OFDM symbols 5 and 6 of slot 0 and OFDM symbols 2 and 3 of slot 1 (as shown in Figure 2) , and OFDM symbols 4 and 5 of the extended CP on slot 0 and slot 1. As mentioned above, only measuring the signal quality at the OFDM symbol position where the CSI-RS is defined in Release 10 cannot meet the requirements of downlink CoMP multi-point transmission for signal quality measurement. The present invention aims to solve the method of how the system indicates which OFDM symbols to measure and how to perform the measurement when measuring CSI-RSRSRQ.

Specifically, according to FIG. 3, the downlink multi-point signal quality measurement method provided by Embodiment 1 of the present invention includes:

Step S301, the user equipment UE receives the channel state information reference signal CSI-RS resource management set configuration information sent by the base station through radio resource control RRC signaling;

Specifically, the configuration information of the CSI-RS resource management set is pre-configured by the base station eNB. In one embodiment, the eNB can pass the neighbor cell information and the OAM (OperationAdministrationMaintenance, operation management and maintenance) interface Obtain the connection list of the adjacent sending nodes adjacent to the eNB, that is, know which cells are adjacent to itself) to configure the CSI-RS resource management set for the specific UE served by the eNB, and then the eNB manages the CSI-RS resources The set configuration information is sent to the UE through UE-specific RRC (Radio Resource) signaling.

Wherein, the CSI-RS resource management set configuration information includes: CSI-RS antenna port number, CSI-RS resource configuration, subframe configuration of each CSI-RS resource; wherein, CSI-RS resource configuration is a kind of indication information, used To indicate the subframe position where the CSI-RS appears, the OFDM symbol position where the CSI-RS appears in the subframe, and the subcarrier position that appears on each RB in the frequency domain; the subframe configuration of the CSI-RS resource represents the CSI -The subframe period and subframe offset of the RS signal;

In another embodiment, the CSI-RS resource management set configuration information further includes: initial cell identification information (marked as X) required for initialization of the sequence scrambling code generated by the CSI-RS reference signal, and the number of CSI-RS resources.

Step S302, UE demodulates the RRC signaling to obtain CSI-RS resource management set configuration information, and according to the CSI-RS antenna port number indicated in the CSI-RS resource management set configuration information, each CSI-RS resource The subframe configuration and CSI-RS resource configuration of the CSI-RS reference signal reception quality RSRQ are measured.

As a preferred embodiment of the present invention, the specific execution process of the specific method for measuring the received quality RSRQ of the CSI-RS reference signal is shown in Figure 4:

Step 31, the UE performs CSI-RS RSRP measurement according to the CSI-RS resource configuration indicated by the RRC signaling;

Specifically, according to the CSI-RS resource configuration indicated by the CSI-RS resource management set configuration information and the subframe configuration of each CSI-RS resource, the UE measures the antenna port corresponding to the CSI-RS antenna port number to obtain Reference signal received power RSRP measurement value of CSI-RS. Specifically, according to the subframe position where the CSI-RS appears, the OFDM symbol position where the CSI-RS is located, and the frequency domain position on the RB where the CSI-RS is located, as indicated by the CSI-RS resource configuration, the UE uses the antenna port Measure the CSI-RS on the bandwidth to measure the signal power on all CSI-RS subcarriers obtained, and then perform arithmetic mean of all these measured power values to obtain the measured value of CSI-RSRSRP on the corresponding CSI-RS resource; The measurement method of CSI-RSRSRP will be further described below by taking an example.

Figure 5a shows a schematic diagram of the CSI-RS ports 15 and 16 of a normalCP type subframe on one RB. Referring to Figure 5a, the CSI-RS RSRP measurement method is described below in the case where the CSI-RS is multi-port; assuming UE A received CSI-RS resource allocation is shown in Figure 5a, which has two CSI-RS resources with port numbers 15 and 16. When performing CSI-RS RSRP measurement, the UE will first perform the orthogonal cover code Despreading, that is, assuming that the data received by the UE on the two OFDM symbol subcarriers shown in Figure 5 are r1 and r2 respectively, then the received signal powers P ₁₅ and P ₁₆ of the UE on ports 15 and 16 are respectively:

${\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; 15</span>}}<span\; class="notranslate">\; =</span>{<span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; r</span>}\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; r</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; ,</span>$ ${\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; 16</span>}}<span\; class="notranslate">\; =</span>{<span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; r</span>}\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; r</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}$

The UE performs an arithmetic average on the signal powers measured on ports 15 and 16 on all RBs to obtain the RSRP measurement value of the CSI-RSRSRP on the corresponding ports 15 and 16. Then the reported value measured on the CSI-RS resource shown in FIG. 5 is the sum of the last RSRP measured values obtained on ports 15 and 16 .

The following describes the CSI-RS RSRP measurement method in the case where the CSI-RS is a single port. As shown in Figure 5b, the CSI-RS antenna port of a normalCP type subframe on one RB is a single port 15. At this time, only port 15 needs to be calculated when calculating CSI-RSRSRP, namely:

${\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; 15</span>}}<span\; class="notranslate">\; =</span>{<span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; r</span>}\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; r</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}$

Then, the UE performs an arithmetic mean on the signal powers measured on all RBs in the CSI-RS measurement bandwidth of port 15 to obtain the measured value of CSI-RSRSRP. This is also the reported value measured on the CSI-RS resource. It can be seen from the above description that no matter it is a single antenna port or multiple antenna ports, the CSI-RSRSRP has only one reported value.

Step 32, the UE performs CSI-RSRSSI measurement;

Specifically, the embodiment of the present invention provides three CSI-RS RSSI measurement methods: based on the measurement position indicated by network signaling, or based on the measurement position indicated by the UE high-level message, or according to the measurement method indicated by the UE high-level message The received signal strength indicator of the CSI-RS measures the RSSI, and the three methods are described in detail below.

Considering that in the downlink CoMP scenario, all downlink transmission points are almost synchronized in time and frequency, so the CRSRSSI results obtained based on CRS measurement in mobility management can be considered to be exactly the same as those based on CSI-RS during CoMP. Same, so in one embodiment of the present invention, a simple and effective CSI-RSRSSI measurement method is to directly borrow the result of the CRSRSSI measurement unit;

Figure 6 is a block diagram of the method for borrowing the results of the CRSRSSI measurement unit. According to Figure 6, the method mainly includes:

Step 1: The UE receives the RRC signaling including the configuration information of the CSI-RS resource management set sent by the eNB, and obtains the CSI-RS resource.

Step 2: In the CSI-RSRSSI measurement unit, the UE directly reads the last physical layer RSSI value measured based on CRS port 0 from the UE side mobility management unit as the physical layer measurement of CSI-RSRSSI value.

In another embodiment of the present invention, the UE may perform CSI-RSRSSI measurement based on the measurement position indicated by the network signaling to obtain the CSI-RSRSSI measurement value;

Specifically, the eNB configures UE-specific RRC signaling for the UE through special RRC signaling, and the RRC signaling includes a location indication message, which is used to indicate which locations in the subframe where the CSI-RS appears to perform CSI - Measurement of RSRSRQ. Here, there are two types of positions indicated by the position indication message. One is to indicate on which OFDM symbols to perform measurements. The indicated position may be all OFDM symbols or a part of OFDM symbols in two slots in a certain subframe. For example, as shown in Figure 7, if the eNB configures the measured symbol positions to be OFDM symbols 3, 4, 5, and 6 of slot 0 and all OFDM symbols of slot 1 through RRC signaling, the UE will RSSI is measured on 10 OFDM symbols, and then the 10 RSSI values are arithmetically averaged to obtain the final CSI-RSRSSI measurement value. Here is a further description of the RSSI measurement method. Assuming that the measurement bandwidth of RSSI is 50 RB, in the LTE protocol, there are 12 subcarriers in total on each RB. Calculate the arithmetic mean of subcarrier power on each RB on each OFDM symbol, and then add the power on all 50 RBs within the measurement bandwidth on this OFDM symbol to obtain the RSSI value on one OFDM symbol. Or when the RRC signaling indicates that the CSI-RSSI measurement is to be performed in five consecutive downlink subframes after the occurrence of the CSI-RS resource position, the UE performs measurement at the positions of all OFDM symbols on these subframes, and then all subframes Do the arithmetic mean of the results obtained from the above measurements.

The calculation average is assumed to have M numbers a1, a2, ..., aM, and the calculation average of these M numbers a=(a1+a2+...+aM)/M.

Another location indication is that the eNB indicates on which downlink subframes to perform RSRQ measurement through special RRC signaling. According to the RRC signaling configured by the eNB, the UE measures the RSSI value of the OFDM symbols on all subframes indicated by the signaling, and then performs the arithmetic mean of the RSSI measured on all subframes to obtain the final CSI-RSRSSI Measurements.

It should be noted that the eNB can use special RRC signaling to indicate to the UE which positions in the subframe where the CSI-RS appears to perform CSI-RSRSRQ measurement; the eNB can also send CSI-RS through radio resource control RRC signaling. When the RS resource management set configures information, the location indication message is also included in the RRC signaling and sent to the corresponding UE.

In another embodiment of the present invention, it is also possible to select a different measurement location to perform CSI-RSRSSI measurement according to the UE side high-level message indication, and obtain the CSI-RSRSSI measurement value;

It should be noted that since the measurement of RSSI does not need to indicate the position in the frequency domain, the UE high layer message only needs to indicate which subframes or which OFDM symbols to measure. Therefore, the location information indicated by the UE high layer message mainly includes: the CSI-RSRSSI antenna port number, the measured subframe number and/or the OFDM symbol in the subframe number;

Specifically, when the above two methods are not used, the upper layers of the UE can define the number of OFDM symbols to be measured or the positions of subframes to be measured, and send the positions of OFDM symbols to be measured to the physical layer of the UE through an inter-layer message. Measurement. For example, the high layer of the UE instructs the UE to perform measurement in OFDM symbols 3, 5, 6 in slot 0 and OFDM symbols 2, 3, 5, 6 in slot 1 of the subframe where the CSI-RS resources are located. The UE physical layer measures the RSSI according to the above indicated OFDM position, and after the measurement, performs arithmetic mean on the RSSI values measured on the above OFDM symbols. Or when the high layer of the UE indicates that the CSI-RSSI measurement should be performed in five consecutive downlink subframes after the occurrence of the CSI-RS resource location, the UE will perform RSSI measurement on all OFDM symbols in these subframes, and then all subframes will The results measured on the frame are arithmetically averaged.

Further, the basic principle of selecting different measurement locations for measurement in the UE side high layer message is to ensure that the UE measures CSI-RSRSSI on a sufficient number of OFDM symbols. For example, if the CSI-RS resource density configured by the eNB for the UE is small (for example, a CSI-RS resource is allocated once every 80 ms in the time domain), the upper layer of the UE can configure the UE physical layer to measure more CSI-RS resources near the position where the CSI-RS appears. OFDM symbols or subframes.

Step 33, the UE physical layer calculates the measurement value of CSI-RSRSRQ according to the formula RSRQ=N*RSRP/RSSI, where N is the number of resource blocks RB on the system measurement received signal strength indication RSSI measurement bandwidth.

It should be noted that, in another embodiment of the present invention, before step S301, further includes:

Step S300, the base station judges whether the currently serving UE has the ability to support downlink CoMP communication according to the capability level reported by the UE, and if the UE does not have the ability to support CoMP communication, exit without performing subsequent operations; if the UE has the ability to support CoMP communication capability then go to step S301.

In this embodiment, by receiving the RRC signaling containing the CSI-RS resource management set configuration information sent by the base station, and according to the CSI-RS resource configuration indication in the CSI-RS resource management set configuration information, CSI is performed at a specific position. - The measurement of RS reference signal reception quality RSRQ, compared with the measurement of signal quality only at the OFDM symbol position where the CSI-RS is located in the prior art, can improve the measurement accuracy of CSI-RSRSRQ for each downlink transmission point, and The implementation complexity is low, and the spectral efficiency of the system is also indirectly improved.

The following provides an optimal embodiment for realizing the measurement of CSI-RS reference signal reception quality RSRQ, as shown in FIG. 8 , in this embodiment, the downlink multi-point signal quality measurement method includes:

Step 801, the user equipment UE receives the channel state information reference signal CSI-RS resource management set configuration information sent by the base station through radio resource control RRC signaling, and the CSI-RS resource management set configuration information includes: CSI-RS antenna port number, CSI-RS resource configuration, and subframe configuration of each CSI-RS resource;

Step 802, the UE demodulates the RRC signaling to obtain CSI-RS resource management set configuration information;

Step 803: According to the CSI-RS resource configuration indicated by the CSI-RS resource management set configuration information and the subframe configuration of each CSI-RS resource, the CSI is obtained by measuring the antenna port corresponding to the CSI-RS antenna port number - RSRP measured value of reference signal received power;

Specifically, according to the subframe position where the CSI-RS appears, the OFDM symbol position where the CSI-RS is located, and the frequency domain position on the RB where the CSI-RS is located, as indicated by the CSI-RS resource configuration, the UE uses the antenna port Measure the CSI-RS on the bandwidth to measure the signal power on all CSI-RS subcarriers, and then perform arithmetic mean of all these measured power values to obtain the measured value of CSI-RSRSRP on the corresponding CSI-RS resource.

It should be noted that, for a detailed CSI-RSRSRP measurement method, reference may be made to step 31 in Embodiment 1 of the present invention, and details are not repeated here.

Step 804: Based on the measurement position indicated by network signaling, or based on the measurement position indicated by the UE high-level message, or based on the measurement method indicated by the UE high-level message, perform CSI-RS RSSI measurement to obtain CSI - RSRSSI measurement;

Specifically, the embodiment of the present invention provides three CSI-RS RSSI measurement methods: based on the measurement position indicated by network signaling, or based on the measurement position indicated by the UE high-level message, or according to the measurement method indicated by the UE high-level message The received signal strength indicator of the CSI-RS measures the RSSI, and the three methods are described in detail below.

Considering that in the downlink CoMP scenario, all downlink transmission points are almost synchronized in time and frequency, so the CRSRSSI results obtained based on CRS measurement in mobility management can be considered to be exactly the same as those based on CSI-RS during CoMP. Same, so in one embodiment of the present invention, a simple and effective CSI-RSRSSI measurement method is to directly borrow the result of the CRSRSSI measurement unit;

Figure 6 is a block diagram of the method for borrowing the results of the CRSRSSI measurement unit. According to Figure 6, the method mainly includes:

Step 1: The UE receives the RRC signaling including the configuration information of the CSI-RS resource management set sent by the eNB, and obtains the CSI-RS resource.

Step 2: In the CSI-RSRSSI measurement unit, the UE directly reads the last physical layer RSSI value measured based on CRS port 0 from the UE side mobility management unit as the physical layer measurement of CSI-RSRSSI value.

In another embodiment of the present invention, the UE may perform CSI-RSRSSI measurement based on the measurement position indicated by the network signaling to obtain the CSI-RSRSSI measurement value;

Specifically, the eNB configures UE-specific RRC signaling for the UE through special RRC signaling, and the RRC signaling includes a position indication message, which is used to indicate which positions in the subframe where the CSI-RS appears to perform CSI - Measurement of RSRSRQ. Here, there are two types of positions indicated by the position indication message. One is to indicate on which OFDM symbols to perform measurements. The indicated position may be all OFDM symbols or a part of OFDM symbols in two slots in a certain subframe. For example, as shown in Figure 7, if the eNB configures the measured symbol positions to be OFDM symbols 3, 4, 5, and 6 of slot 0 and all OFDM symbols of slot 1 through RRC signaling, the UE will RSSI is measured on 10 OFDM symbols, and then the 10 RSSI values are arithmetically averaged to obtain the final CSI-RSRSSI measurement value. Here is a further description of the RSSI measurement method. Assuming that the measurement bandwidth of RSSI is 50 RB, in the LTE protocol, there are 12 subcarriers in total on each RB. Calculate the arithmetic mean of subcarrier power on each RB on each OFDM symbol, and then add the power on all 50 RBs within the measurement bandwidth on this OFDM symbol to obtain the RSSI value on one OFDM symbol. Or when the RRC signaling indicates that the CSI-RSSI measurement is to be performed in five consecutive downlink subframes after the occurrence of the CSI-RS resource position, the UE performs measurement at the positions of all OFDM symbols on these subframes, and then all subframes Do the arithmetic mean of the results obtained from the above measurements.

The calculation average is assumed to have M numbers a1, a2, ..., aM, and the calculation average of these M numbers a=(a1+a2+...+aM)/M.

Another location indication is that the eNB indicates on which downlink subframes to perform RSRQ measurement through special RRC signaling. According to the RRC signaling configured by the eNB, the UE measures the RSSI value of the OFDM symbols on all subframes indicated by the signaling, and then performs the arithmetic mean of the RSSI measured on all subframes to obtain the final CSI-RSRSSI Measurements.

It should be noted that the eNB can use special RRC signaling to indicate to the UE which positions in the subframe where the CSI-RS appears to perform CSI-RSRSRQ measurement; the eNB can also send CSI-RS through radio resource control RRC signaling. When the RS resource management set configures information, the location indication message is also included in the RRC signaling and sent to the corresponding UE.

In another embodiment of the present invention, it is also possible to select a different measurement location to perform CSI-RSRSSI measurement according to the UE side high-level message indication, and obtain the CSI-RSRSSI measurement value;

It should be noted that since the measurement of RSSI does not need to indicate the position in the frequency domain, the UE high layer message only needs to indicate which subframes or which OFDM symbols to measure. Therefore, the location information indicated by the UE high layer message mainly includes: the CSI-RSRSSI antenna port number, the measured subframe number and/or the OFDM symbol in the subframe number;

Specifically, when the above two methods are not used, the upper layers of the UE can define the number of OFDM symbols to be measured or the positions of subframes to be measured, and send the positions of OFDM symbols to be measured to the physical layer of the UE through an inter-layer message. Measurement. For example, the high layer of the UE instructs the UE to perform measurement in OFDM symbols 3, 5, 6 in slot 0 and OFDM symbols 2, 3, 5, 6 in slot 1 of the subframe where the CSI-RS resources are located. The UE physical layer measures the RSSI according to the above indicated OFDM position, and after the measurement, performs arithmetic mean on the RSSI values measured on the above OFDM symbols. Or when the high layer of the UE indicates that the CSI-RSSI measurement should be performed in five consecutive downlink subframes after the occurrence of the CSI-RS resource location, the UE will perform RSSI measurement on all OFDM symbols in these subframes, and then all subframes will The results measured on the frame are arithmetically averaged.

Further, the basic principle of selecting different measurement locations for measurement in the UE side high layer message is to ensure that the UE measures CSI-RSRSSI on a sufficient number of OFDM symbols. For example, if the CSI-RS resource density configured by the eNB for the UE is small (for example, a CSI-RS resource is allocated once every 80 ms in the time domain), the upper layer of the UE can configure the UE physical layer to measure more CSI-RS resources near the position where the CSI-RS appears. OFDM symbols or subframes.

Step 805, according to the formula RSRQ=N*RSRP/RSSI, calculate the measurement value of CSI-RSRSRQ, wherein, N is the number of resource blocks RB on the bandwidth where the RSSI is measured, RSRP is the measurement value of CSI-RSRSRP, and RSSI is the measured value of CSI-RSRSSI.

In this embodiment, by receiving the RRC signaling containing the CSI-RS resource management set configuration information sent by the base station, and according to the CSI-RS resource configuration indication in the CSI-RS resource management set configuration information, CSI is performed at a specific position. - The measurement of RS reference signal reception quality RSRQ, compared with the measurement of signal quality only at the OFDM symbol position where the CSI-RS is located in the prior art, can improve the measurement accuracy of CSI-RSRSRQ for each downlink transmission point, and The implementation complexity is low, and the spectral efficiency of the system is also indirectly improved.

Embodiment two

Fig. 9 shows a structural block diagram of a device for measuring downlink multipoint signal quality provided by Embodiment 2 of the present invention. In this embodiment, the device may be a software unit, a hardware unit, or a combination of software and hardware in the user equipment. The user equipment measures the channel state information reference signal CSI-RS reference signal reception quality RSRQ; the user equipment can form a wireless communication system with a base station and a plurality of downlink transmission points, and the device includes: a receiving unit 91, a demodulation unit 92 , a first measurement unit 93 , a second measurement unit 94 and a calculation unit 95 .

Wherein, the receiving unit 91 is configured to receive CSI-RS resource management set configuration information sent by the base station through radio resource control RRC signaling, and the CSI-RS resource management set configuration information includes: CSI-RS antenna port number, CSI-RS Resource configuration, and subframe configuration of each CSI-RS resource;

Specifically, the configuration information of the CSI-RS resource management set is pre-configured by the eNB. In one embodiment, the eNB can obtain the information according to the topology of the network (that is, the eNB can obtain the information through the adjacent cell information and the OAM (Operation Administration Maintenance) interface. The connection list of the adjacent sending nodes adjacent to the eNB, that is, knowing which cells are adjacent to itself) to configure the CSI-RS resource management set for the specific UE served by the eNB, and then the eNB will use this CSI-RS resource management set It is sent to the UE through UE-specific RRC signaling.

Wherein, the CSI-RS resource management set configuration information includes: CSI-RS antenna port number, CSI-RS resource configuration, subframe configuration of each CSI-RS resource; wherein, CSI-RS resource configuration is a kind of indication information, used to indicate the OFDM symbol position where the CSI-RS appears in the subframe, and the subcarrier position that appears on each RB in the frequency domain; the subframe configuration of the CSI-RS resource indicates the subframe period and sub frame offset;

In another embodiment, the CSI-RS resource management set configuration information further includes: initial cell identification information (marked as X) required for initialization of the sequence scrambling code generated by the CSI-RS reference signal, and the number of CSI-RS resources.

The demodulation unit 92 is configured to demodulate the RRC signaling received by the receiving unit 91 to obtain CSI-RS resource management set configuration information;

The first measurement unit 93 is configured to, according to the CSI-RS resource configuration indicated by the CSI-RS resource management set configuration information, and the subframe configuration of each CSI-RS resource, the CSI-RS antenna port number corresponding to Antenna port measurement obtains the reference signal received power RSRP measurement value of CSI-RS;

Specifically, the first measurement unit 93 determines the position of the subframe where the CSI-RS appears, the position of the OFDM symbol where the CSI-RS is located, and the frequency domain position of the RB where the CSI-RS is located, as indicated by the CSI-RS resource configuration. The CSI-RS on the measurement bandwidth of the above-mentioned antenna port is used to measure the signal power on all CSI-RS subcarriers, and then the arithmetic mean of all these measured power values is obtained to obtain the CSI-RSRSRP on the corresponding CSI-RS resource measured value.

It should be noted that, for the specific working process of the first measuring unit 93, reference may be made to step 31 in Embodiment 1 of the present invention, which will not be repeated here.

The second measurement unit 94 is configured to indicate the received signal strength of the CSI-RS based on the measurement position indicated by network signaling, or based on the measurement position indicated by the UE high layer message, or based on the measurement method indicated by the UE high layer message RSSI measurement, get CSI-RSRSSI measurement value;

Specifically, in one embodiment, the second measurement unit 94 may select different measurement locations to perform CSI-RSRSSI measurement according to the location information indicated by the high layer message of the user equipment, and obtain the CSI-RSRSSI measurement value; wherein the user equipment The location information indicated by the high layer message includes: CSI-RSRSSI antenna port number, measured subframe number and/or OFDM symbol in the subframe number.

In another embodiment, the second measurement unit 94 first receives the measurement location information sent by the base station through RRC signaling, and the measurement location information includes the OFDM symbol location and/or where the second measurement unit performs CSI-RSRSSI measurement. The subframe where the UE performs CSI-RSRSSI measurement;

Then, the second measurement unit 94 performs CSI-RSRSSI measurement at the location indicated by the measurement location information to obtain a CSI-RSRSSI measurement value.

In another embodiment, the second measurement unit 94 may also only read the latest RSSI value from the user equipment side mobility management unit as the measurement value of CSI-RSRSSI, wherein the RSSI value is obtained by the physical layer of the UE based on common reference signal CRS port 0 measurement.

It should be noted that, for the specific working process of the second measuring unit 94, reference may be made to step 32 in Embodiment 1 of the present invention, which will not be repeated here.

The calculation unit 95 is configured to calculate the measurement value of CSI-RSRSRQ according to the formula RSRQ=N*RSRP/RSSI, where N is the number of resource blocks RB of the bandwidth where the system measures the received signal strength indication RSSI.

The user equipment provided by this embodiment of the present invention may be applied in the foregoing corresponding first method embodiment. For details, refer to the description of the foregoing first embodiment, and details are not repeated here.

In the second embodiment of the present invention, by receiving the RRC signaling containing the CSI-RS resource management set configuration information sent by the base station, and according to the CSI-RS resource configuration indication in the CSI-RS resource management set configuration information, at a specific location The CSI-RS reference signal received quality RSRQ measurement is performed on the CSI-RS reference signal. Compared with the prior art, which only measures the signal quality at the OFDM symbol position where the CSI-RS is located, it can be used when the density of the CSI-RS is small. , to ensure the measurement accuracy of CSI-RSRSRQ, thereby improving the measurement accuracy of CSI-RSRSRQ of each downlink transmission point, and the implementation complexity is low, and the spectral efficiency of the system is also indirectly improved.

It is worth noting that in the above-mentioned device embodiments, the included units are only divided according to functional logic, but are not limited to the above-mentioned divisions, as long as the corresponding functions can be realized; in addition, the specific names of each functional unit It is only for the convenience of distinguishing each other, and is not used to limit the protection scope of the present invention.

In addition, those of ordinary skill in the art can understand that all or part of the steps in the methods of the above-mentioned embodiments can be completed by instructing related hardware through programs, and the corresponding programs can be stored in a computer-readable storage medium. Storage media, such as ROM/RAM, magnetic disk or optical disk, etc.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (12)

1. A downlink multipoint signal quality measurement method, characterized in that, comprising: The user equipment UE receives channel state information reference signal CSI-RS resource management set configuration information sent by the base station through radio resource control RRC signaling, and the CSI-RS resource management set configuration information includes: CSI-RS antenna port number, CSI-RS Resource configuration, and subframe configuration of each CSI-RS resource; The UE demodulates the RRC signaling to obtain CSI-RS resource management set configuration information; According to the CSI-RS resource configuration indicated by the CSI-RS resource management set configuration information, and the subframe configuration of each CSI-RS resource, the CSI-RS is obtained by measuring the antenna port corresponding to the CSI-RS antenna port number Reference signal received power RSRP measurement value; Based on the measurement position indicated by network signaling, or based on the measurement position indicated by the UE high-level message, or based on the measurement method indicated by the UE high-level message, perform CSI-RS Received Signal Strength Indication RSSI measurement to obtain CSI-RS RSSI measurement value; According to the formula RSRQ=N*RSRP/RSSI, the measured value of CSI-RSRSRQ is calculated, wherein, N is the number of resource blocks RB on the bandwidth where the received signal strength indicator RSSI is located, RSRP is the CSI-RSRSRP measured value, and RSSI is the CSI- RSRSSI measurement. 2. The method according to claim 1, wherein the RRC signaling further includes: a location indication message, the location indication message is used to indicate the location where the UE performs CSI-RSRSSI measurement; Perform CSI-RSRSSI measurement at the measurement location indicated by the network signaling to obtain the CSI-RSRSSI measurement value, specifically including: The UE performs CSI-RSRSSI measurement at the measurement location indicated by the location indication message according to the location indication message included in the RRC signaling, to obtain a CSI-RSRSSI measurement value. 3. The method according to claim 2, wherein the measurement location indicated by the location indication message specifically includes: the OFDM symbol location where the UE performs CSI-RSRSSI measurement and/or the UE performs CSI-RSRSSI measurement. The subframe where the RSRSSI is measured. 4. The method according to claim 1, wherein the CSI-RSRSSI measurement is performed based on the measurement position indicated by the network signaling to obtain the CSI-RSRSSI measurement value, which specifically includes: The UE receives the measurement location information sent by the base station through RRC signaling, and the measurement location information includes the OFDM symbol location where the UE performs CSI-RSRSSI measurement and/or the sub-symbol where the UE performs CSI-RSRSSI measurement. frame; The UE performs CSI-RSRSSI measurement at the location indicated by the measurement location information to obtain a CSI-RSRSSI measurement value. 5. The method according to claim 1, wherein the CSI-RSRSSI measurement is performed based on the measurement position indicated by the UE high layer message, and the CSI-RSRSSI measurement value is obtained, which specifically includes: The physical layer of the UE selects different measurement locations for CSI-RSRSSI measurement according to the location information indicated by the UE high-layer message, and obtains the CSI-RSRSSI measurement value, wherein the location information indicated by the UE high-layer message includes: CSI-RSRSSI Antenna port number, measured subframe number and/or OFDM symbols in said subframe number. 6. The method according to claim 1, wherein the measurement method based on the UE high layer message indication performs CSI-RSRSSI measurement to obtain a CSI-RSRSSI measurement value, specifically comprising: The UE directly reads the latest RSSI value at the current moment from the UE-side mobility management unit as the measurement value of CSI-RSRSSI, wherein the RSSI value is based on the common reference signal CRS port of the physical layer of the UE 0 measured. 7. The method according to any one of claims 1-6, wherein the CSI-RS resource configuration indicated according to the CSI-RS resource management set configuration information, and the subclass of each CSI-RS resource Frame configuration, the reference signal received power RSRP measurement value of the CSI-RS is obtained by measuring the antenna port corresponding to the CSI-RS antenna port number, specifically including: According to the subframe position where the CSI-RS appears, the OFDM symbol position where the CSI-RS is located, and the frequency domain position on the RB where the CSI-RS is located indicated by the CSI-RS resource configuration, the measurement bandwidth on the antenna port The CSI-RS measures the signal power on all the CSI-RS subcarriers obtained, and then arithmetically averages all these measured power values to obtain the measured value of the CSI-RSRSRP on the corresponding CSI-RS resource. 8. A downlink multi-point signal quality measurement device, used for user equipment UE to measure channel state information reference signal CSI-RS reference signal reception quality RSRQ, characterized in that the device includes: The receiving unit is configured to receive CSI-RS resource management set configuration information sent by the base station through radio resource control RRC signaling, the CSI-RS resource management set configuration information includes: CSI-RS antenna port number, CSI-RS resource configuration, and the subframe configuration of each CSI-RS resource; A demodulation unit, configured to demodulate the RRC signaling received by the receiving unit to obtain CSI-RS resource management set configuration information; The first measurement unit is configured to use the antenna corresponding to the CSI-RS antenna port number according to the CSI-RS resource configuration indicated by the CSI-RS resource management set configuration information and the subframe configuration of each CSI-RS resource The port measurement obtains the reference signal received power RSRP measurement value of the CSI-RS; The second measurement unit is configured to perform CSI-RS received signal strength indication (RSSI) based on the measurement position indicated by network signaling, or based on the measurement position indicated by the UE high-level message, or based on the measurement method indicated by the UE high-level message Measure to get the CSI-RSRSSI measurement value; The calculation unit is used to calculate the measurement value of CSI-RSRSRQ according to the formula RSRQ=N*RSRP/RSSI, where N is the number of resource block RBs in the bandwidth where the received signal strength indicator RSSI is located, and RSRP is the measurement value of CSI-RSRSRP , RSSI is the measured value of CSI-RSRSSI. 9. The device according to claim 8, wherein the second measuring unit is specifically used for: Select different measurement locations to perform CSI-RSRSSI measurement according to the location information indicated by the user equipment high layer message, and obtain the CSI-RSRSSI measurement value, wherein the location information indicated by the user equipment high layer message includes: CSI-RSRSSI antenna port number, The measured subframe number and/or the OFDM symbols in the subframe number. 10. The device according to claim 8, wherein the second measurement unit is specifically used for: Read the latest RSSI value from the user equipment side mobility management unit as the measurement value of CSI-RSRSSI, wherein the RSSI value is based on the physical layer of the UE based on the common reference signal CRS port 0 measured. 11. The device according to claim 8, wherein the second measurement unit is specifically used for: receiving measurement location information sent by the base station through RRC signaling, where the measurement location information includes the OFDM symbol location where the second measurement unit performs CSI-RSRSSI measurement and/or the sub-unit where the UE performs CSI-RSRSSI measurement frame; Perform CSI-RSRSSI measurement at the location indicated by the measurement location information to obtain a CSI-RSRSSI measurement value. 12. The device according to any one of claims 8-11, wherein the first measurement unit is specifically used for: According to the subframe position where the CSI-RS appears, the OFDM symbol position where the CSI-RS is located, and the frequency domain position on the RB where the CSI-RS is located indicated by the CSI-RS resource configuration, the measurement bandwidth on the antenna port The CSI-RS measures the signal power on all the CSI-RS subcarriers obtained, and then arithmetically averages all these measured power values to obtain the measured value of the CSI-RSRSRP on the corresponding CSI-RS resource.