CN103491523A - CSI-RS information providing method and communication terminal - Google Patents

Abstract

The embodiment of the invention discloses a method for providing CSI-RS information and a communication terminal. The communication terminal maintains the configuration information of at least one channel state information reference signal CSI-RS in the idle state; when returning from the idle state to the connected state, the CSI-RS information corresponding to the configuration information of the at least one CSI-RS is sent to service base. By adopting the invention, the communication delay can be reduced and the communication quality can be improved.

Description

Method and communication terminal for providing CSI-RS information

technical field

The present invention relates to the field of wireless communication, in particular to a method for providing CSI-RS information and a method for a communication terminal to provide CSI-RS information.

Background technique

Coordinated multi-point (Coordinated multi-point, CoMP) transmission refers to a plurality of geographically separated transmission points, cooperatively participating in sending data to a user equipment (User Equipment, UE) or jointly receiving data sent by a UE, participating in the cooperation The multiple transmission points usually refer to base stations of different cells, and the UE is also a communication terminal. CoMP technology is a technology created to improve the coverage performance and throughput of edge users. Especially when the user equipment is at the edge of the cell, the UE is placed on the same frequency of multiple base stations, and several base stations serve the UE at the same time. The use of CoMP can reduce inter-cell interference, mainly to improve the spectrum efficiency of cell edge users.

The CoMP set is a set of multiple transmission points that perform CoMP transmission with the UE. For the UE, each transmission point usually sends a different Channel State Information Reference Signal (Channel State Information Reference Signal, CSI-RS) to distinguish each other, so that The UE performs channel estimation on the link between itself and the transmission point. Specifically, when the UE is in the connected state, the serving base station will periodically or under certain conditions provide the UE with the configuration information of the CSI-RS corresponding to at least one transmission point, and the UE maintains the CSI-RS in the form of a CoMP set and measurement, and return the corresponding CSI-RS information to the serving base station, so that the serving base station can select at least one transmission point to perform CoMP transmission with the UE according to the CSI-RS information returned by the UE.

However, in the existing CoMP transmission scheme, when the UE recovers from the idle state to the connected state, it cannot immediately provide CSI-RS information to the serving base station for CoMP transmission, but must re-receive CSI of at least one transmission point from the serving base station -RS configuration information, and then CoMP transmission can be performed, which will cause transmission delay and affect user experience.

Contents of the invention

The technical problem to be solved by the embodiments of the present invention is to provide a method for providing CSI-RS information and a communication terminal, which can reduce transmission delay and improve user experience.

In order to solve the above technical problems, on the one hand, an embodiment of the present invention provides a method for providing CSI-RS information, including:

maintaining configuration information of at least one channel state information reference signal CSI-RS in an idle state;

When returning from the idle state to the connected state, the CSI-RS information corresponding to the configuration information of the at least one CSI-RS is sent to the serving base station.

On the other hand, an embodiment of the present invention also provides a method for providing CSI-RS information, including:

In the idle state, perform measurement based on configuration information of at least one channel state information reference signal CSI-RS to obtain measurement results;

When returning from the idle state to the connected state, the measurement result is sent to the serving base station.

On the other hand, an embodiment of the present invention also provides a communication terminal, including:

The idle state maintenance module is used to maintain at least one configuration information result of the channel state information reference signal CSI-RS in the idle state;

The sending module is configured to send the CSI-RS information corresponding to the at least one CSI-RS configuration information to the serving base station when returning from the idle state to the connected state.

On the other hand, an embodiment of the present invention also provides a communication terminal, including:

An idle state measurement module, configured to perform measurements based on configuration information of at least one CSI-RS in an idle state to obtain measurement results;

A sending module, configured to send the measurement result to the serving base station when returning from the idle state to the connected state.

Implementing the embodiment of the present invention has the following beneficial effects: by maintaining and/or measuring the configuration information of the CSI-RS in the idle state, and converting the CSI-RS from the idle state to the connected state The CSI-RS information corresponding to the configuration information is uploaded to the serving base station, which can enable the serving base station to quickly select the transmission point for coordinated multi-point transmission, and reduce the communication delay caused by the communication terminal not knowing the configuration information of the CSI-RS during the communication connection. Improved communication quality.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

FIG. 1 is a flowchart of a first embodiment of a method for providing CSI-RS information in the present invention;

FIG. 2 is a flow chart of the second embodiment of the method for providing CSI-RS information in the present invention;

FIG. 3 is a flowchart of a third embodiment of a method for providing CSI-RS information in the present invention;

FIG. 4 is a flowchart of a fourth embodiment of a method for providing CSI-RS information in the present invention;

FIG. 5 is a flowchart of a fifth embodiment of a method for providing CSI-RS information in the present invention;

FIG. 6 is a schematic structural diagram of a first embodiment of a communication terminal in the present invention;

FIG. 7 is a schematic structural diagram of a second embodiment of a communication terminal in the present invention;

Fig. 8 is a schematic structural diagram of the third embodiment of the communication terminal in the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Please refer to FIG. 1, which is a flow chart of the first embodiment of the method for providing CSI-RS information in the present invention. The method includes:

S100. Maintain configuration information of at least one CSI-RS in an idle state. Wherein, one CSI-RS is used to correspond to one transmission point, and all transmission points maintained by the terminal can be used as a CoMP set. The CoMP set may be a CoMP cooperating set (CoMP cooperating set), a CoMP measurement set (CoMP measurement set) or a resource management set (resource management set, RM set). The CoMP cooperating set is a collection of transmission points that directly or indirectly participate in transmitting data for a terminal on a time-frequency resource block, wherein, directly participating in data transmission means that the transmission point is actually a transmission point for the terminal in the time-frequency resource block Indirect participation in data transmission means that the transmission point does not actually transmit data on the time-frequency resource block for the terminal, but decides how to schedule/beam-form the user on the time-frequency resource block. contribute. The transmission point in the CoMP measurement set is used by the terminal to measure the channel quality of the link between the transmission point and the terminal. The transmission point in the resource management set is used to perform measurement on the transmission point and the terminal link, and the additional RRM (Radio Resource Management, Radio Resource Management) measurement method may also be how to distinguish different transmission points in the same cell, or how to determine from A CoMP measurement set is selected from the RRM set. CSI-RS configuration information includes CSI-RS sequence, time-frequency resource configuration for CSI-RS transmission, transmission period, CSI-RS configuration identifier, CSI-RS configuration index number, antenna port for transmitting the CSI-RS, and transmission period for the CSI-RS. Information such as the number of antennas used by the CSI-RS, subframe configuration, and CSI-RS resources. In addition, the "idle state" mentioned herein refers to the time when the communication terminal is in a standby state.

S101. When returning from an idle state to a connected state, send CSI-RS information corresponding to the at least one CSI-RS configuration information to a serving base station. Specifically, physical layer signaling (L1 signaling), MAC (Medium Access Control, medium access control layer) layer signaling (L2 signaling), RRC (Radio Resource Control, radio resource control) signaling (L3 signaling) and so on to send the CSI-RS information to the serving base station. Wherein, the CSI-RS information may be CSI-RS configuration information or a CSI-RS identifier (CSI-RS index). After obtaining the CSI-RS information maintained by the communication terminal, the serving base station selects some or all transmission points maintained by the communication terminal according to the CSI-RS information to directly or indirectly participate in CoMP transmission with the communication terminal. In addition, the "returning from the idle state to the connected state" mentioned in this article includes both the time when the communication terminal returns to the connected state from the idle state, and also includes the random access of the communication terminal in the idle state (such as the arrival of uplink data, the arrival of downlink data, etc.) random access due to arrival, radio link failure, etc.) or when random access is completed.

The method for providing CSI-RS information in the embodiment of the present invention is to maintain the CSI-RS configuration information in the idle state, and upload the CSI-RS information corresponding to the CSI-RS configuration information when the idle state is converted to the connected state For the serving base station, the serving base station can quickly select the transmission point for coordinated multi-point transmission, which reduces the communication delay caused by the communication terminal not knowing the configuration information of the CSI-RS during the communication connection, and improves the communication quality.

Please refer to FIG. 2, which is a flow chart of the second embodiment of the method for providing CSI-RS information in the present invention, the method includes:

S200. Maintain configuration information of at least one CSI-RS in an idle state.

S201. Perform measurement based on the maintained configuration information of at least one CSI-RS to obtain a measurement result. Specifically, the measurement results can be RSRP (Reference Signal Receiving Power, reference signal receiving power), RSRQ (Reference Signal Receiving Quality, reference signal receiving quality), SINR (Signal to Interference plus Noise Ratio, signal to interference plus noise ratio), SNR (Signalto Noise Ratio, Signal to Noise Ratio), RSSI (Received Signal Strength Indication, Received Signal Strength Indication), CQI (Channel Quality Indicator, Channel Quality Indicator), PMI (PrecodingMatrix Indicator, Precoding Matrix Indicator), RI ( Rank Indicator, rank indicator) and other measurements. Specifically, the measurement result may be a measurement value of each CSI-RS in the maintained CSI-RS, or a measurement value of each CSI-RS in a subset of the maintained CSI-RS, or a measurement value of the maintained CSI-RS The total measurement, or the total measurement of a subset of the maintained CSI-RS. For example, all CSI-RSs known to the communication terminal may be measured, or only one or more subsets of the CSI-RSs known to the communication terminal may be measured. For another example, measurement may be performed on a single CSI-RS, and one or more of measurement values such as RSRP, RSRQ, SINR, SNR, RSSI, CQI, PMI, and RI corresponding to each CSI-RS may be obtained. Also for example, multiple CSI-RSs may be measured to obtain a total measurement result, such as one or more of RSRP, RSRQ, SINR, SNR, RSSI, CQI, PMI, RI and other measurement values. In addition, the CSI-RS may be measured periodically, or the CSI-RS may be measured only under certain conditions.

S202. When returning from the idle state to the connected state, send the measurement result to the serving base station. After obtaining the measurement result uploaded by the communication terminal, the serving base station selects some or all transmission points maintained by the communication terminal according to the measurement result to directly or indirectly participate in CoMP transmission with the communication terminal. In addition, the "returning from the idle state to the connected state" mentioned in this article includes both the time when the communication terminal returns to the connected state from the idle state, and also includes the random access of the communication terminal in the idle state (such as the arrival of uplink data, the arrival of downlink data, etc.) random access due to arrival, radio link failure, etc.) or when random access is completed.

In steps S100 and S200, there are multiple sources of CSI-RS configuration information in the communication terminal, and two of the embodiments will be illustrated below with reference to FIGS. 3-4 .

Please refer to FIG. 3, which is a flow chart of the third embodiment of the method for providing CSI-RS information in the present invention. The method includes:

S300. Receive and maintain configuration information of at least one CSI-RS configured by the serving base station in a connected state.

S301. After entering the idle state, continue to maintain the configuration information of the at least one CSI-RS.

S302. Perform measurement based on the maintained configuration information of at least one CSI-RS to obtain a measurement result.

S303. When returning from the idle state to the connected state, send the measurement result to the serving base station.

Please refer to FIG. 4, which is a flow chart of the fourth embodiment of the method for providing CSI-RS information in the present invention. The method includes:

S400. In an idle state, receive a broadcast message from a serving base station or a neighboring base station, where the base station broadcast message includes configuration information of at least one CSI-RS.

S401. Maintain configuration information of the at least one CSI-RS in the broadcast message. In the prior art, although the communication terminal also receives the broadcast message in the idle state, it does not contain the configuration information of the CSI-RS, that is to say, the communication terminal cannot obtain the configuration information of the CSI-RS in the idle state .

S402. Perform measurement based on the maintained configuration information of at least one CSI-RS to obtain a measurement result.

S403. When returning from the idle state to the connected state, send the measurement result to the serving base station.

Since the broadcast message is periodically updated and sent, the communication terminal can obtain the CSI-RS configuration information from the received broadcast message multiple times in the idle state, and update the maintained CSI-RS configuration information in real time. Therefore, in other embodiments of the present invention, the embodiments shown in FIG. 3 and FIG. 4 can be combined, that is, in the idle state, the configuration information of at least one CSI-RS configured by the serving base station in the previous connected state can be maintained , and receive and maintain configuration information of other CSI-RS through broadcast messages in real time, so as to update the maintained CoMP set in real time.

Please refer to FIG. 5, which is a flow chart of the fifth embodiment of the method for providing CSI-RS information in the present invention, including:

S500. In an idle state, perform measurement based on configuration information of at least one channel state information reference signal CSI-RS to obtain a measurement result. Specifically, the measurement result may be a measurement value of RSRP, RSRQ, SINR, SNR, RSSI, CQI, PMI, RI, and the like. The configuration information of the CSI-RS may be configured by the serving base station in the previous connection state, or may be obtained from broadcast messages of the serving base station or neighbor base stations in the idle state. The measurement result can be the measurement value of each CSI-RS in the known CSI-RS, or the measurement value of each CSI-RS in a subset of the known CSI-RS, or the total measurement value of the known CSI-RS , or the total measurements of a subset of the known CSI-RS. For example, all CSI-RSs known to the communication terminal may be measured, or only one or more subsets of the CSI-RSs known to the communication terminal may be measured. For another example, measurement may be performed on a single CSI-RS, and one or more of measurement values such as RSRP, RSRQ, SINR, SNR, RSSI, CQI, PMI, and RI corresponding to each CSI-RS may be obtained. Also for example, multiple CSI-RSs may be measured to obtain a total measurement result, such as one or more of RSRP, RSRQ, SINR, SNR, RSSI, CQI, PMI, RI and other measurement values. The CSI-RS may be measured periodically, or the CSI-RS may be measured only under certain conditions. In addition, the "idle state" mentioned herein refers to the time when the communication terminal is in a standby state.

S501. When returning from an idle state to a connected state, send the measurement result to a serving base station. After obtaining the measurement result uploaded by the communication terminal, the serving base station selects some or all transmission points maintained by the communication terminal according to the measurement result to directly or indirectly participate in CoMP transmission with the communication terminal. In addition, the "returning from the idle state to the connected state" mentioned in this article includes both the time when the communication terminal returns to the connected state from the idle state, and also includes the random access of the communication terminal in the idle state (such as the arrival of uplink data, the arrival of downlink data, etc.) random access due to arrival, radio link failure, etc.) or when random access is completed. In the embodiments listed above, the steps of maintaining, measuring, and sending can be performed unconditionally, or only under certain conditions.

For example, in steps S100, S200, S301 or S401, the configuration information of at least one CSI-RS is maintained only within the preset time range of the idle state; and/or, only when the moving speed of the communication terminal is within the preset range , maintaining the configuration information of the at least one CSI-RS in the idle state; and/or maintaining the configuration information of the at least one CSI-RS in the idle state only when the position of the communication terminal changes within a preset range .

For another example, in S200, S301, S401 or S500, only within the preset time range of the idle state, the measurement is performed based on the configuration information of at least one CSI-RS to obtain the measurement result; and/or, only when the communication terminal moves When the speed is within the preset range, in the idle state, perform measurement based on the configuration information of at least one CSI-RS to obtain the measurement result; and/or, only when the position change of the communication terminal is within the preset range, in the idle state Performing measurement based on configuration information of at least one CSI-RS to obtain a measurement result.

In addition, since the measurement of the CSI-RS may be performed periodically, that is, the communication terminal will periodically update the measurement result when it is idle, after S200, S301 or S401, it may also include: when the measurement result is greater than the preset When the threshold is set, continue to maintain the configuration information of the at least one CSI-RS in the idle state, and perform measurement based on the maintained configuration information of the at least one CSI-RS to obtain the latest measurement results. Likewise, after S500, it may further include: when the measurement result is greater than the preset threshold, continue to perform measurement based on configuration information of at least one CSI-RS in an idle state to obtain the latest measurement result.

Similarly, in steps S101, S202, S303, S403 or S501, only when the moving speed of the communication terminal is within the preset range, when returning from the idle state to the connected state, the configuration of the at least one CSI-RS Send the CSI-RS information corresponding to the information to the serving base station; and/or, only when the position change of the communication terminal is within a preset range, when returning from the idle state to the connected state, the configuration of the at least one CSI-RS The CSI-RS information corresponding to the information is sent to the serving base station. Alternatively, in S202, S303, S403 or S501, when the measurement result is greater than the preset threshold, when returning from the idle state to the connected state, the CSI-RS information corresponding to the configuration information of the at least one CSI-RS (such as measurement results) are sent to the serving base station.

For example, when the communication terminal is in an idle state, the configuration information of the CSI-RS is only maintained within 30 minutes; after 30 minutes, the maintained configuration information of the CSI-RS is deleted. For another example, when the communication terminal is in an idle state, if the moving speed of the communication terminal is within a preset range (for example, lower than 50km/h), then continue to maintain the configuration information of the CSI-RS; if the moving speed of the communication terminal exceeds the preset If the range is set (for example, higher than 50km/h), the configuration information of the CSI-RS will no longer be maintained. For another example, when the communication terminal is in the idle state, if the position change of the communication terminal is within the preset range (for example, the position when the communication terminal just returned to the idle state is the center of the circle, and the radius is within the range of d), then continue to maintain CSI-RS configuration information; if the position of the communication terminal changes beyond the preset range (for example, the position when the communication terminal just returned to the idle state is the center of the circle, and the radius is within the range of d), then the CSI-RS will no longer be maintained. RS configuration information. For another example, when the communication terminal is in the idle state, if the measurement result for the CSI-RS is greater than the preset first threshold, then continue to maintain the configuration information of the CSI-RS, and continue to maintain the configuration information based on the maintained CSI-RS Perform measurement to obtain the latest measurement result; if the CSI-RS measurement result is not greater than the preset first threshold, delete the maintained configuration information of the CSI-RS, and no longer perform measurement. Wherein, the measurement result of CSI-RS may be the measured value of each CSI-RS measured, or the measured value of each CSI-RS in the subset of the measured CSI-RS, or the measured value of all CSI-RS The total measurement value, or the total measurement value of a subset of the measured CSI-RS. Those skilled in the art should understand that the above examples are also applicable to the measuring step and the sending step.

Maintaining CSI-RS configuration information under certain conditions, performing measurements based on configuration information under certain conditions, and sending CSI-RS information to the base station under certain conditions can avoid when the CSI-RS configuration information obtained by the communication terminal is useless (For example, when the communication terminal is in a fast-moving state, due to the rapid change of its location, the COMP set maintained by the communication terminal in the idle state may not be applicable to the connected state) still maintain, measure, and useless CSI-RS configuration information Sending useless CSI-RS information to the base station will affect the correct selection of the transmission point by the base station and reduce the communication quality.

Please refer to FIG. 6, which is a schematic structural diagram of a communication terminal 600 in the present invention. The communication terminal 600 includes:

The idle state maintenance module 610 is configured to maintain configuration information of at least one channel state information reference signal CSI-RS in the idle state. Wherein, one CSI-RS is used to correspond to one transmission point, and all transmission points maintained by the terminal can be used as a CoMP set. CSI-RS configuration information includes CSI-RS sequence, time-frequency resource configuration for CSI-RS transmission, transmission period, CSI-RS configuration identifier, CSI-RS configuration index number, antenna port for transmitting the CSI-RS, and transmission period for the CSI-RS. Information such as the number of antennas used by the CSI-RS, subframe configuration, and CSI-RS resources. In addition, the "idle state" mentioned herein refers to the time when the communication terminal is in a standby state.

The sending module 620 is configured to send the CSI-RS information corresponding to the configuration information of the at least one CSI-RS to the serving base station when returning from the idle state to the connected state, so that the serving base station can Select at least one transmission point to perform coordinated multi-point transmission with the communication terminal. Specifically, the sending module 620 may pass physical layer signaling (L1 signaling), MAC (Medium Access Control, medium access control layer) layer signaling (L2 signaling), RRC (Radio Resource Control, radio resource control) signaling (L3 signaling) and so on to send the CSI-RS information to the serving base station. Wherein, the CSI-RS information sent to the serving base station is CSI-RS configuration information or a CSI-RS identifier (CSI-RS index). After obtaining the CSI-RS information maintained by the communication terminal, the serving base station selects some or all transmission points maintained by the communication terminal according to the CSI-RS information to directly or indirectly participate in CoMP transmission with the communication terminal. In addition, the "returning from the idle state to the connected state" mentioned in this article includes both the time when the communication terminal returns to the connected state from the idle state, and also includes the random access of the communication terminal in the idle state (such as the arrival of uplink data, the arrival of downlink data, etc.) random access due to arrival, radio link failure, etc.) or when random access is completed.

In the embodiment of the present invention, the communication terminal maintains the configuration information of the CSI-RS in the idle state, and uploads the CSI-RS information corresponding to the configuration information of the CSI-RS to the serving base station when the idle state is converted to the connected state. The serving base station quickly selects the transmission point for coordinated multi-point transmission, reduces the communication delay caused by the communication terminal not knowing the configuration information of the CSI-RS during the communication connection, and improves the communication quality.

Please refer to FIG. 6 , which is a schematic structural diagram of a communication terminal 700 in the present invention. In addition to the idle state maintenance module 610 and the sending module 620, the communication terminal 700 also includes:

The idle state measurement module 630 is configured to perform measurement in the idle state based on the configuration information of at least one CSI-RS maintained by the idle state maintenance module 610 to obtain a measurement result. Specifically, the measurement result may be a measurement value of RSRP, RSRQ, SINR, SNR, RSSI, CQI, PMI, RI, and the like. Specifically, the measurement result may be the measurement value of each CSI-RS in the CSI-RS maintained by the idle state maintenance module 610, or the measurement value of each CSI-RS in the subset of CSI-RS maintained by the idle state maintenance module 610 value, or the total measurement value of the CSI-RS maintained by the idle state maintenance module 610, or the total measurement value of a subset of the CSI-RS maintained by the idle state maintenance module 610. For example, the idle state measurement module 630 may measure all CSI-RS known to the communication terminal, or may only measure one or more subsets of the CSI-RS known to the communication terminal. For another example, the idle state measurement module 630 can measure a single CSI-RS, and obtain one or more of the measurement values corresponding to each CSI-RS, such as RSRP, RSRQ, SINR, SNR, RSSI, CQI, PMI, and RI. . Also for example, the idle state measurement module 630 can measure multiple CSI-RSs to obtain a total measurement result, such as one or more of RSRP, RSRQ, SINR, SNR, RSSI, CQI, PMI, RI and other measurement values . In addition, the idle state measurement module 630 may measure the CSI-RS periodically, or measure the CSI-RS only under certain conditions.

In this embodiment, the CSI-RS information sent by the sending module 620 to the serving base station when returning from the idle state to the connected state includes the measurement result measured by the idle state measurement module 630 .

In the above embodiments, there are multiple sources of CSI-RS configuration information. For example, the idle state maintenance module 610 is used to maintain the configuration information of at least one CSI-RS configured by the serving base station in the previous connection state in the idle state. configured.

For another example, the communication terminal 600 or 700 further includes a broadcast message receiving module, configured to receive a broadcast message from a serving base station or a neighbor base station in an idle state, and the broadcast message includes configuration information of at least one CSI-RS. The idle state maintenance module 610 is configured to maintain configuration information of the at least one CSI-RS in the broadcast message.

Since the broadcast message is periodically updated and sent, the idle state maintenance module 610 can obtain the CSI-RS configuration information from the received broadcast message multiple times in the idle state, and update the maintained CSI-RS configuration information in real time. Therefore, in other embodiments of the present invention, these two methods can be combined, that is, the idle state maintenance module 610 maintains the configuration information of at least one CSI-RS configured by the serving base station in the previous connection state in the idle state, and The configuration information of other CSI-RSs is received and maintained through broadcast messages in real time, so as to update the maintained CoMP set in real time.

Please refer to FIG. 8, which is a schematic structural diagram of a communication terminal 800 in the present invention. The communication terminal 800 includes:

The idle state measurement module 810 is configured to perform measurement based on configuration information of at least one channel state information reference signal CSI-RS in the idle state to obtain a measurement result. Specifically, the measurement result may be a measurement value of RSRP, RSRQ, SINR, SNR, RSSI, CQI, PMI, RI, and the like. The configuration information of the CSI-RS may be configured by the serving base station in the previous connection state, or may be obtained from broadcast messages of the serving base station or neighbor base stations in the idle state. The measurement result can be the measurement value of each CSI-RS in the known CSI-RS, or the measurement value of each CSI-RS in a subset of the known CSI-RS, or the total measurement value of the known CSI-RS , or the total measurements of a subset of the known CSI-RS. For example, the idle state measurement module 810 may measure all the CSI-RS known to the communication terminal, or may only measure one or more subsets of the CSI-RS known to the communication terminal. For another example, the idle state measurement module 810 can measure a single CSI-RS, and obtain one or more of the measurement values corresponding to each CSI-RS, such as RSRP, RSRQ, SINR, SNR, RSSI, CQI, PMI, and RI. . Also for example, the idle state measurement module 810 can measure multiple CSI-RSs to obtain a total measurement result, such as one or more of RSRP, RSRQ, SINR, SNR, RSSI, CQI, PMI, RI and other measurement values . The idle state measurement module 810 may measure the CSI-RS periodically, or measure the CSI-RS only under certain conditions. In addition, the "idle state" mentioned herein refers to the time when the communication terminal is in a standby state.

The sending module 820 is configured to send the measurement result to the serving base station when returning from the idle state to the connected state. After obtaining the measurement result uploaded by the communication terminal, the serving base station selects some or all transmission points maintained by the communication terminal according to the measurement result to directly or indirectly participate in CoMP transmission with the communication terminal. In addition, the "returning from the idle state to the connected state" mentioned in this article includes both the time when the communication terminal returns to the connected state from the idle state, and also includes the random access of the communication terminal in the idle state (such as the arrival of uplink data, the arrival of downlink data, etc.) random access due to arrival, radio link failure, etc.) or when random access is completed.

In the above-mentioned embodiments, the maintenance step of the idle state maintenance module 610, the measurement step of the idle state measurement module 630, and the sending step of the sending module 620 can be performed unconditionally or only under certain conditions.

For example, the idle state maintenance module 610 maintains the configuration information of at least one CSI-RS only within the preset time range of the idle state; and/or, only when the moving speed of the communication terminal is within the preset range, maintaining the configuration information of the at least one CSI-RS; and/or maintaining the configuration information of the at least one CSI-RS in an idle state only when the location of the communication terminal changes within a preset range.

For another example, the idle state measurement module 630 or 810 performs measurement based on configuration information of at least one CSI-RS to obtain measurement results only within the preset time range of the idle state; and/or, only when the moving speed of the communication terminal is within When within the preset range, perform measurements based on the configuration information of at least one CSI-RS in the idle state to obtain measurement results; and/or, only when the position change of the communication terminal is within the preset range, in the idle state based on at least The configuration information of a CSI-RS is measured to obtain the measurement result.

In addition, since the measurement of the CSI-RS may be performed periodically, that is, the communication terminal will periodically update the measurement results when in the idle state, the idle state maintenance module 610 only when the measurement result of the idle state measurement module 630 is greater than the preset threshold , continue to maintain the configuration information of the at least one CSI-RS in the idle state, and the idle state measurement module 620 performs measurements based on the configuration information of the at least one CSI-RS maintained by the idle state maintenance module 610 to obtain the latest measurement results . Likewise, the idle state measurement module 810 may also be configured to: when the measurement result is greater than a preset threshold, continue to perform measurement based on configuration information of at least one CSI-RS in the idle state to obtain the latest measurement result.

Similarly, the sending module 620 or 820 sends the CSI-RS information corresponding to the at least one CSI-RS configuration information to Sending to the serving base station; and/or, only when the position of the communication terminal changes within a preset range, when returning from the idle state to the connected state, the CSI-RS information corresponding to the configuration information of the at least one CSI-RS sent to the serving base station. Alternatively, the sending module 620 or 820, only when the measurement result of the idle state measurement module 630 or 810 is greater than the preset threshold, when returning from the idle state to the connected state, sends the CSI corresponding to the configuration information of the at least one CSI-RS - RS information (eg measurement results) is sent to the serving base station.

The idle state maintenance module 610 maintains CSI-RS configuration information under certain conditions, the idle state measurement module 630 or 810 performs measurement based on configuration information under certain conditions, and the sending module 620 or 820 sends CSI-RS information to The base station can avoid that when the configuration information of the CSI-RS obtained by the communication terminal is useless (for example, when the communication terminal is in a fast-moving state, the COMP set maintained by the communication terminal in the idle state may not be suitable for Connected state) still maintains and measures useless CSI-RS configuration information and sends useless CSI-RS information to the base station, which affects the correct selection of the transmission point by the base station and reduces communication quality.

For the specific processes executed by the module units in the devices in FIG. 6 , FIG. 7 and FIG. 8 , reference may be made to the description of the previous method embodiments, and details are not repeated in this embodiment.

Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be implemented through computer programs to instruct related hardware, and the programs can be stored in a computer-readable storage medium. During execution, it may include the processes of the embodiments of the above-mentioned methods. Wherein, the storage medium may be a magnetic disk, an optical disk, a read-only memory (Read-Only Memory, ROM) or a random access memory (Random Access Memory, RAM), etc.

What is disclosed above is only a preferred embodiment of the present invention, and of course it cannot limit the scope of rights of the present invention. Those of ordinary skill in the art can understand all or part of the process for realizing the above embodiments, and according to the rights of the present invention The equivalent changes required still belong to the scope covered by the invention.

Claims (16)

1. A method for providing CSI-RS information, comprising: maintaining configuration information of at least one channel state information reference signal CSI-RS in an idle state; When returning from the idle state to the connected state, the CSI-RS information corresponding to the configuration information of the at least one CSI-RS is sent to the serving base station. 2. The method according to claim 1, wherein the configuration information of the at least one CSI-RS is configured by the serving base station in the previous connection state. 3. The method according to claim 1 or 2, wherein the configuration information of the at least one CSI-RS comes from a broadcast message of a serving base station or a neighbor base station. 4. The method according to any one of claims 1-3, wherein the CSI-RS information includes configuration information of the CSI-RS or a CSI-RS identifier corresponding to the configuration information. 5. The method according to any one of claims 1-4, wherein after maintaining the configuration information of at least one CSI-RS in the idle state, the method further comprises: in the idle state based on the maintained The configuration information of at least one CSI-RS is measured to obtain a measurement result; The CSI-RS information sent to the serving base station also includes the measurement result. 6. The method according to claim 5, wherein the measurement result comprises a measurement value of each CSI-RS in the at least one CSI-RS, or a measurement value of each CSI-RS in the subset of the at least one CSI-RS The measurement value of the CSI-RS, or the total measurement value of the at least one CSI-RS, or the total measurement value of a subset of the at least one CSI-RS. 7. The method according to any one of claims 1-6, wherein maintaining the configuration information of at least one CSI-RS in the idle state comprises: Maintain configuration information of at least one CSI-RS only within a preset time range of the idle state; and/or Maintaining the configuration information of the at least one CSI-RS in an idle state only when the moving speed of the communication terminal is within a preset range; and/or The configuration information of the at least one CSI-RS is maintained in an idle state only when the position change of the communication terminal is within a preset range. 8. The method according to claim 5 or 6, wherein the performing measurement based on the maintained configuration information of at least one CSI-RS to obtain measurement results in the idle state comprises: Only within the preset time range of the idle state, perform measurements based on the maintained configuration information of at least one CSI-RS to obtain measurement results; and/or Only when the moving speed of the communication terminal is within a preset range, in the idle state, perform measurement based on the maintained configuration information of at least one CSI-RS to obtain a measurement result; and/or Only when the position change of the communication terminal is within the preset range, the measurement is performed based on the maintained configuration information of at least one CSI-RS in the idle state to obtain the measurement result. 9. The method according to claim 5 or 6, wherein after performing measurement based on the maintained configuration information of at least one CSI-RS to obtain the measurement result, further comprising: When the measurement result is greater than the preset threshold, continue to maintain the configuration information of the at least one CSI-RS in the idle state, and perform measurement based on the maintained configuration information of the at least one CSI-RS to obtain the latest measurement result. 10. The method according to claim 5 or 6, wherein when the idle state is restored to the connected state, the CSI-RS information corresponding to the configuration information of the at least one CSI-RS is sent to the serving base station include: Only when the moving speed of the communication terminal is within a preset range, when returning from the idle state to the connected state, send the CSI-RS information corresponding to the configuration information of the at least one CSI-RS to the serving base station; and/or Sending CSI-RS information corresponding to the configuration information of the at least one CSI-RS to the serving base station only when the position change of the communication terminal is within a preset range, when returning from the idle state to the connected state; Only when the measurement result is greater than the preset threshold, when returning from the idle state to the connected state, send the CSI-RS information corresponding to the configuration information of the at least one CSI-RS to the serving base station. 11. A method for providing CSI-RS information, comprising: In the idle state, perform measurement based on configuration information of at least one channel state information reference signal CSI-RS to obtain measurement results; When returning from the idle state to the connected state, the measurement result is sent to the serving base station. 12. The method according to claim 11, wherein said performing measurement based on configuration information of at least one Channel State Information Reference Signal (CSI-RS) in the idle state to obtain measurement results comprises: Only within the preset time range of the idle state, perform measurements based on configuration information of at least one CSI-RS to obtain measurement results; and/or Only when the moving speed of the communication terminal is within a preset range, in the idle state, perform measurement based on configuration information of at least one CSI-RS to obtain a measurement result; and/or Only when the position change of the communication terminal is within the preset range, the measurement is performed based on the configuration information of at least one CSI-RS in the idle state to obtain the measurement result. 13. The method according to claim 11 or 12, further comprising: after performing measurement based on configuration information of at least one CSI-RS to obtain measurement results: When the measurement result is greater than the preset threshold, in the idle state, continue to perform measurement based on configuration information of at least one CSI-RS to obtain the latest measurement result. 14. A communication terminal, characterized in that it comprises: The idle state maintenance module is used to maintain the configuration information of at least one channel state information reference signal CSI-RS in the idle state; The sending module is configured to send the CSI-RS information corresponding to the at least one CSI-RS configuration information to the serving base station when returning from the idle state to the connected state. 15. The communication terminal according to claim 14, wherein the communication terminal further comprises: An idle state measurement module, configured to perform measurement in the idle state based on the configuration information of at least one CSI-RS maintained by the idle state maintenance module to obtain measurement results; The CSI-RS information sent by the sending module to the serving base station also includes the measurement result. 16. A communication terminal, characterized in that it comprises: An idle state measurement module, configured to perform measurements based on configuration information of at least one CSI-RS in an idle state to obtain measurement results; A sending module, configured to send the measurement result to the serving base station when returning from the idle state to the connected state.

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