CN102685795A - Configuration method for RRM (radio resource management) measurement - Google Patents
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Abstract
The invention discloses a configuration method for RRM measurement. The method is applied to scenes where new carrier type is introduced and characterized in that a base station configures CSI-RS resource information for the new carrier type; the base station selects the CSI-RS information, configures a measuring objective CSI-RS function cell for indicating the selected CSI-RS resource information and configures measurement reporting conditions; the selected CSI-RS information, the configured corresponding CSI-RS function cell and the measurement reporting conditions are notified to UE (unified equipment); the UE carries out corresponding measurement according to the CSI-RS function cell and corresponding CSI-RS resource information notified by the base station; when the measurement reporting conditions are met, the UE sends corresponding measurement reports to the base station, and the base station carries out corresponding process according to the measurement reports sent by the UE. According to the configuration method, RRM measurement in scenes where new carrier type is introduced can be achieved.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a configuration method for RRM measurement in radio resource management.
Background
In the multicarrier aggregation CA of LTE Release 11, a New Carrier Type (NCT) is introduced. From the perspective of RAN 1, the main purpose of introducing NCT for carrier aggregation is to improve spectrum efficiency and energy efficiency, improve the support capability of heterogeneous network HetNet scene, better support inter-machine communication scene, and enhanced multimedia Broadcast Multicast Service (eMBMS) Service, etc.
At present, RRM measurement is carried out on the traditional inter-carrier aggregation in LTE Rel-10 through a CRS reference signal, and the problems of low energy efficiency, poor HetNet scene interference coordination effect and the like are brought. If the new carrier type also uses CRS for RRM measurement, the reference signal overhead is large and interference coordination cannot be flexibly performed. Synchronization and RRM measurement based on the existing CSI-RS reference signal still need to be studied, and a configuration method of RRM measurement thereof is not discussed at present.
Disclosure of Invention
The invention provides a configuration method for RRM measurement in wireless resource management (RRM), which aims to solve the problem of RRM measurement in the scene of introducing a newly added carrier type in the prior art.
The invention discloses a configuration method for radio resource management RRM measurement, which is applied to a scene of introducing a newly added carrier type and is characterized by comprising the following steps:
the base station configures channel state indication reference signal CSI-RS resource information for the newly added carrier type;
the base station selects the CSI-RS resource information, configures a CSI-RS functional cell for indicating the measurement purpose of the selected CSI-RS resource information, and configures measurement reporting conditions; notifying the selected CSI-RS resource information, the configured corresponding CSI-RS functional cells and the measurement reporting conditions to the UE;
the UE carries out corresponding measurement according to the CSI-RS functional cells notified by the base station and the corresponding CSI-RS resource information;
and when the measurement report condition is met, the UE sends a corresponding measurement report to the base station, and the base station carries out corresponding processing according to the measurement report sent by the UE.
In the above method, the purpose of measuring the CSI-RS resource information includes: RSRP measurement, CSI feedback, interference measurement and auxiliary cell management;
the CSI-RS functional cell comprises more than 2 bits, and different measurement purposes of CSI-RS resource information are identified by different state values of the bits.
In the method, notifying the UE of the selected CSI-RS resource information, the configured corresponding CSI-RS functional cell and the measurement reporting condition comprises the following steps:
the CSI-RS resource information of one newly added carrier type corresponds to a cell index PCI;
the base station broadcasts CSI-RS resource information of all newly added carrier types through a system information block SIB 2; the UE reads SIB2 through cell residence, acquires CSI-RS resource information of all newly added carrier types and stores the CSI-RS resource information in local;
the base station sends the cell index corresponding to the selected CSI-RS resource information, the configured corresponding CSI-RS functional cell and the measurement reporting condition to the UE through an RRC connection reconfiguration message;
and the UE locally searches the corresponding CSI-RS resource information according to the PCI sent by the base station.
In the above method, notifying the UE of the selected CSI-RS resource information, the configured corresponding CSI-RS functional cell, and the measurement reporting condition includes:
and sending the selected CSI-RS resource information, the configured corresponding CSI-RS functional cells and the measurement reporting conditions to the UE through an RRC connection reconfiguration message.
In the above method, notifying the UE of the selected CSI-RS resource information, the configured corresponding CSI-RS functional cell, and the measurement reporting condition includes:
the base station sets a CSI-RS index mapping table, and an index number is configured for each piece of CSI-RS resource information in the CSI-RS index mapping table;
the base station broadcasts the CSI-RS index mapping table through SIB2, and the UE reads SIB2 through cell residence to acquire the CSI-RS index mapping table and store the CSI-RS index mapping table locally;
the base station searches a corresponding index number in the CSI-RS index mapping table according to the selected CSI-RS resource information, and sends the searched index number, the configured corresponding CSI-RS functional cell and the measurement reporting condition to the UE through an RRC connection reconfiguration message;
and the UE finds the corresponding CSI-RS resource information in a locally stored CSI-RS index mapping table according to the index number sent by the base station.
In the above method, notifying the UE of the selected CSI-RS resource information, the configured corresponding CSI-RS functional cell, and the measurement reporting condition includes:
configuring a CSI-RS index mapping table in a protocol, and configuring an index number for each piece of CSI-RS resource information in the CSI-RS index mapping table;
the base station searches a corresponding index number in the CSI-RS index mapping table according to the selected CSI-RS resource information, and sends the searched index number, the configured corresponding CSI-RS functional cell and the measurement reporting condition to the UE through an RRC connection reconfiguration message;
and the UE finds the corresponding CSI-RS resource information in a CSI-RS index mapping table stored in the protocol according to the index number sent by the base station.
In the method, the UE performing corresponding measurement according to the CSI-RS function cell notified by the base station and the corresponding CSI-RS resource information includes:
when the measurement purpose indicated by the CSI-RS function information element is RSRP measurement, the UE measures the signal strength of the adjacent cell according to the received CSI-RS resource information;
when the measurement purpose indicated by the CSI-RS functional cell is CSI feedback, the UE carries out CSI estimation according to the received CSI-RS resource information and feeds back the obtained CSI to the base station;
when the measurement purpose indicated by the CSI-RS functional cell is interference measurement, the UE sets the transmission power of a CSI-RS reference signal of the cell to zero, and then measures the interference power of the adjacent cells at the same position according to the received CSI-RS resource information;
and when the measurement purpose indicated by the CSI-RS functional cell is auxiliary cell management, the UE performs auxiliary cell management on the newly added carrier type according to the measured RSRP/RSRQ measurement value.
In the above method, the configuring the measurement reporting condition includes:
the base station configures a threshold value for the UE to measure and report according to the CSI-RS functional cell,
when a measured value obtained by the UE through CSI-RS RRM measurement meets a preset threshold value, the UE sends a measurement report to a base station;
or,
and the base station configures the period of measurement reporting of the UE, and the UE sends the measurement reporting to the base station at preset time intervals when carrying out CSI-RS RRM measurement.
In the above method, the performing, by the base station, corresponding processing according to the measurement report sent by the UE includes:
when the measurement purpose indicated by the CSI-RS functional cell is RSRP measurement, the base station selects an adjacent cell with signal quality meeting a preset condition according to the RSRP/RSRP measurement value reported by the UE;
when the measurement purpose indicated by the CSI-RS functional cell is CSI feedback, the base station configures a data transmission mode according to channel quality information in the CSI feedback reported by the UE;
when the measurement purpose indicated by the CSI-RS functional cell is interference measurement, the base station estimates the interference condition of the CSI-RS resource of the cell according to the interference power value of the adjacent cell reported by the UE;
and when the measurement purpose indicated by the CSI-RS functional cell is auxiliary cell management, the base station performs auxiliary cell management according to the RSRP/RSRQ measurement value of the newly added carrier type reported by the UE.
In the above method, the base station performing corresponding processing according to the measurement report sent by the UE further includes:
the base station judges whether to carry out RSRP/RSRQ measurement on the newly added carrier type triggering the reporting event and whether to update the polymerizable carrier cell according to a measurement report sent by the UE; and sending the judgment result to the UE through an RRC message.
In summary, the present invention provides a method for configuring RRM measurement, where a base station configures CSI-RS resource information of a channel state indication reference signal for a newly added carrier type; the base station selects the CSI-RS resource information, configures a CSI-RS functional cell for indicating the measurement purpose of the selected CSI-RS resource information, and configures measurement reporting conditions; notifying the selected CSI-RS resource information, the configured corresponding CSI-RS functional cells and the measurement reporting conditions to the UE; the UE carries out corresponding measurement according to the CSI-RS functional cells notified by the base station and the corresponding CSI-RS resource information; and when the measurement report condition is met, the UE sends a corresponding measurement report to the base station, and the base station performs RRM measurement in a corresponding processing mode according to the measurement report sent by the UE. The CSI-RS functional cells are adopted to inform the UE of RRM measurement with different purposes, and CSI-RS resource information required by the measurement is informed to the UE in different modes, so that the problem of RRM measurement in a scene of introducing a newly added carrier type is solved, and the vacancy of the prior art is made up.
Drawings
Fig. 1 is a flow chart of a method for configuring RRM measurements in the present invention;
fig. 2 is a signalling flow diagram of RRM measurements in a first embodiment of the invention;
fig. 3 is a signalling flow diagram of RRM measurements in a second embodiment of the invention;
fig. 4 is a signalling flow diagram of RRM measurements in a third embodiment of the invention;
fig. 5 is a signaling flow diagram of RRM measurements in a fourth embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 is a flow chart of a method for configuring RRM measurements in the present invention; the method provided by the invention is applied to a scene of introducing a newly added carrier type, as shown in fig. 1;
102, a base station selects CSI-RS resource information, configures a CSI-RS functional cell for indicating the measurement purpose of the selected CSI-RS resource information, and configures measurement reporting conditions; and informing the selected CSI-RS resource information, the configured corresponding CSI-RS functional cells and the measurement reporting conditions to the UE.
And 103, the UE carries out corresponding measurement according to the CSI-RS functional cell notified by the base station and the corresponding CSI-RS resource information.
And step 104, when the measurement report condition is met, the UE sends a corresponding measurement report to the base station, and the base station performs corresponding processing according to the measurement report sent by the UE.
The new carrier type mentioned in the invention is a carrier type different from the carrier type defined by LTE Rel 10 and previous releases, is mainly discussed and determined in LTE Rel 11 release and is used in carrier aggregation scenes of Rel-11 and later releases. And the cells of the newly added carrier type are aggregated depending on the cells of the traditional carrier type.
In step 102, the objective of measuring the CSI-RS resource information configured by the base station includes: reference Signal Received Power (RSRP) measurement, Channel State Indication (CSI) feedback, interference measurement, Secondary Cell (SCell) management; the CSI-RS function cell which is configured by the base station and used for indicating the CSI-RS resource information measurement purpose comprises more than 2 bits, and different measurement purposes of the CSI-RS resource information are identified by different state values of the bits.
In the first embodiment disclosed by the invention, the base station broadcasts the configured CSI-RS resource information of all newly added carrier types through the SIB2, and the SIB2 is read after the UE cell resides, so as to acquire and locally store the CSI-RS resource information of all newly added carrier types. Then, selecting CSI-RS resource information of a newly added carrier type needing CSI-RS RRM measurement according to actual deployment requirements, and informing the UE of a cell index corresponding to the CSI-RS resource information; and the UE searches the corresponding CSI-RS resource information according to the cell index notified by the base station. Fig. 2 is a signaling flow diagram of RRM measurements in a first embodiment of the present invention, as shown in fig. 2,
in step 201, the base station broadcasts CSI-RS resource information through a system information block SIB 2.
In step 201, the base station has configured CSI-RS resource information for each new carrier type. In the specific implementation process, one newly added carrier type corresponds to one cell, and each cell has a corresponding cell index PCI. And the base station broadcasts the configured CSI-RS resource information of all newly added carrier types to the UE through the SIB 2.
Step 202, after the UE camps in the cell, the UE reads SIB2 to obtain CSI-RS resource information.
In step 202, the UE camps on a cell of a conventional carrier type, acquires CSI-RS resource information of all newly added carrier types by reading SIB2, and stores the acquired CSI-RS resource information locally.
Step 203, initiating a random access request, and establishing an RRC connection between the UE and the base station.
And step 204, selecting CSI-RS resource information. In step 204, the base station selects CSI-RS resource information that needs to perform CSI-RS RRM measurement according to the actual deployment situation.
Step 205, the base station sends an RRC connection reconfiguration message to the UE, where the RRC connection reconfiguration message carries the cell index of the selected CSI-RS resource information, the CSI-RS functional cell, and the corresponding measurement reporting condition.
In step 205, the base station searches for a corresponding cell index according to the selected CSI-RS resource information. And the base station sends the cell index corresponding to the selected CSI-RS resource information, the configured corresponding CSI-RS functional cell and the measurement reporting condition to the UE through an RRC connection reconfiguration message, namely, the base station transmits the parameters through the RRC connection reconfiguration message. In other embodiments of the present invention, other modes may be selected according to specific situations, and the cell index, the CSI-RS functional cell and the corresponding measurement reporting condition corresponding to the selected CSI-RS resource information are sent to the UE.
Wherein, the corresponding measurement reporting conditions are specifically: and the base station configures a threshold value for the UE to send the measurement report according to the CSI-RS functional cell, and when the measured value obtained by the UE through the CSI-RS RRM measurement meets a preset threshold value, the UE sends the measurement report to the base station.
And step 206, the UE performs corresponding measurement according to the selected CSI-RS resource information and the corresponding CSI-RS functional cell.
In step 206, the UE searches for corresponding CSI-RS resource information from all locally stored CSI-RS resource information of the newly added carrier type according to the cell index corresponding to the CSI-RS resource information notified by the base station. And the UE carries out corresponding measurement according to the CSI-RS functional cells and the CSI-RS resource information. The CSI-RS function cell is used for indicating the measurement purpose of the CSI-RS resource information, and the measurement purpose of the current commonly used CSI-RS resource information comprises the following steps: RSRP measurement, CSI feedback, interference measurement and auxiliary cell management. In addition, the CSI-RS function cell can be expanded to be applied to the concrete implementation process of other measurement purposes in the future.
The performing corresponding measurement according to different measurement targets includes:
when the measurement purpose indicated by the CSI-RS function information element is RSRP measurement, the UE measures the signal strength of the adjacent cell according to the received CSI-RS resource information;
when the measurement purpose indicated by the CSI-RS functional cell is CSI feedback, the UE carries out CSI estimation according to the received CSI-RS resource information and feeds back the obtained CSI to the base station;
when the measurement purpose indicated by the CSI-RS functional cell is interference measurement, the UE sets the transmission power of a CSI-RS reference signal of the cell to zero, and then measures the interference power of the adjacent cells at the same position according to the received CSI-RS resource information;
and when the measurement purpose indicated by the CSI-RS functional cell is auxiliary cell management, the UE performs auxiliary cell management on the newly added carrier type according to the measured RSRP/RSRQ measurement value.
In step 207, the UE sends a measurement report to the base station. In step 207, after performing corresponding measurement according to the CSI-RS functional cell and the CSI-RS resource information, when the measurement result satisfies the measurement report condition configured by the base station, the UE triggers a measurement report event, and sends a measurement report to the base station, where the measurement report carries a cell index corresponding to the CSI-RS information resource of the newly added carrier type that triggered the measurement report event, and a corresponding measurement value.
And step 208, the base station performs corresponding processing according to the measurement report of the UE.
In step 208, since the RRC connection reconfiguration message sent by the base station to the UE carries the cell index, the corresponding CSI-RS functional cell and the corresponding measurement reporting condition, the UE only needs to carry the cell index corresponding to the CSI-RS information resource of the newly added carrier type triggering the measurement report event and the corresponding measurement value when sending the measurement report. The base station can search the corresponding CSI-RS resource information, the corresponding CSI-RS functional cells and the corresponding measurement reporting conditions according to the cell index corresponding to the CSI-RS information resource of the newly added carrier type triggering the measurement report event.
The base station performs corresponding processing according to the measurement report sent by the UE, and the processing comprises the following steps:
when the measurement purpose indicated by the CSI-RS functional cell is RSRP measurement, the base station selects an adjacent cell with signal quality meeting a preset condition according to the RSRP/RSRP measurement value reported by the UE; the condition meeting the preset condition may specifically be that the reported RSRP/RSRP measurement value is greater than a set high threshold value, or is lower than a low threshold value.
When the measurement purpose indicated by the CSI-RS functional cell is CSI feedback, the base station configures a data transmission mode according to channel quality information in the CSI feedback reported by the UE; when the CSI feedback channel quality information is good, the base station configures a high-speed data transmission mode; and when the quality information of the CSI feedback channel is poor, the base station configures a low-speed data transmission mode. The standard for the base station to judge the quality of the channel can be set according to the comparison of simulation results of channel measurement in an actual scene. I.e. the base station selects from them the relatively good and the relatively bad based on the measurement results.
When the measurement purpose indicated by the CSI-RS functional cell is interference measurement, the base station estimates the interfered condition of the CSI-RS resource information of the cell according to the interference power value of the adjacent cell reported by the UE; namely, the user scheduling is carried out by calculating the signal-to-interference-and-noise ratio of the cell.
And when the measurement purpose indicated by the CSI-RS functional cell is auxiliary cell management, the base station performs auxiliary cell management according to the RSRP/RSRQ measurement value of the newly added carrier type reported by the UE.
In the invention, the CSI-RS resource information and the CSI-RS function cells are in a binding relationship and are not in one-to-one correspondence, and a plurality of pieces of CSI-RS resource information can all be the same measurement purpose, namely correspond to one CSI-RS function cell. For one CSI-RS resource information, there is one CSI-RS function information element for indicating the CSI-RS resource information measurement purpose.
In the second embodiment of the present invention, a real-time configuration mode is adopted after the UE accesses the system, that is, the selected CSI-RS resource information of the newly added carrier type requiring the CSI-RS RRM measurement is sent to the UE through an RRC message. Fig. 3 is a signalling flow diagram of RRM measurements in a second embodiment of the invention; as shown in figure 3 of the drawings,
step 301, initial access. I.e. the UE accesses the network.
Step 302, establishing an RRC connection between the UE and the base station.
And step 303, selecting CSI-RS resource information. In step 303, the base station selects CSI-RS resource information that needs to perform CSI-RS RRM measurement according to the actual deployment situation.
Step 304, the base station sends RRC connection reconfiguration information to the UE, and the selected CSI-RS resource information, the corresponding CSI-RS function cell and the corresponding measurement reporting condition are carried in the RRC connection reconfiguration information.
In step 304, the base station sends the selected CSI-RS resource information of the newly added carrier type that needs to perform the CSI-RS RRM measurement, the corresponding CSI-RS functional cell and the corresponding measurement reporting condition to the UE through the RRC connection reconfiguration message.
And 305, the UE performs corresponding measurement according to the CSI-RS resource information sent by the base station and the corresponding CSI-RS functional cell. The specific measurement process in step 305 is the same as step 206 in fig. 2.
In step 306, the UE sends a measurement report to the base station. In step 306, after the UE performs corresponding measurement according to the CSI-RS resource information and the corresponding CSI-RS functional cell, when the measurement result meets the measurement reporting condition configured by the base station, a measurement report event is triggered, and then the UE sends a measurement report to the base station; and carrying CSI-RS information resources of a newly added carrier type triggering a measurement report event and a corresponding measured value in the measurement report.
Step 307, the base station performs corresponding processing according to the measurement report of the UE.
In step 307, the corresponding processing performed by the base station according to the measurement report of the UE is the same as that performed in step 208 shown in fig. 2.
In other embodiments of the present invention, the base station configures a reference number for each CSI-RS resource information in the CSI-RS index mapping table by configuring the CSI-RS index mapping table, and transmits the corresponding CSI-RS resource information in a manner of transmitting the reference number, thereby reducing the occupation rate of the system bandwidth resources. Table 1 is a CSI-RS resource information index mapping table in an embodiment of the present invention, as shown in table 1.
| Index number | Antenna port | Resource allocation | Subframe configuration | Energy ratio |
| 0 | ||||
| 1 | ||||
| ... |
TABLE 1
The meaning of each parameter of the CSI-RS resource information in table 1 is: the antenna port represents the antenna port number of the CSI-RS resource information; the resource configuration represents a resource configuration number of the CSI-RS resource information; the subframe configuration represents a subframe configuration number of the CSI-RS resource information, and comprises the following steps: a subframe configuration period and a subframe offset; the Energy ratio represents the ratio of the Energy (EPRE) of each resource Element of the PDSCH to the CSI-RS EPRE when the UE performs CSI feedback, and the value is [ -8, 15] dB.
In a third embodiment of the present invention, a base station configures a CSI-RS index mapping table, where the CSI-RS index mapping table includes CSI-RS resource information of all newly added carrier types. And the base station informs the UE of the configured CSI-RS index mapping table in a system broadcasting mode, and then informs the UE of the selected CSI-RS resource information in a mode of sending the index number corresponding to the selected CSI-RS resource information to the UE. Fig. 4 is a signalling flow diagram of RRM measurements in a third embodiment of the invention; as shown in figure 4 of the drawings,
step 401, the base station sets a CSI-RS index mapping table.
Step 402, the base station broadcasts the CSI-RS index mapping table through SIB 2.
Step 403, the UE resides in the cell, and obtains the CSI-RS index mapping table by reading the SIB2 and stores the table locally.
Step 404, establishing an RRC connection between the UE and the base station.
Step 405, selecting CSI-RS resource information. In step 405, the base station selects CSI-RS resource information that needs to perform CSI-RS RRM measurement according to the actual deployment situation.
Step 406, the base station sends an RRC connection reconfiguration message to the UE, where the RRC connection reconfiguration message carries an index number corresponding to the selected CSI-RS resource information, a corresponding CSI-RS functional cell, and a corresponding measurement reporting condition.
In step 406, the base station searches a corresponding index number in the CSI-RS index mapping table according to the selected CSI-RS resource information, and sends the index number corresponding to the found CSI-RS resource information, the corresponding CSI-RS functional cell, and the corresponding measurement reporting condition to the UE through an RRC connection reconfiguration message.
Step 407, the UE performs corresponding measurement according to the CSI-RS resource information notified by the base station and the corresponding CSI-RS functional cell. The UE searches for corresponding CSI-RS resource information in a locally stored CSI-RS index mapping table according to an index number carried in the RRC connection reconfiguration message sent by the base station, and the specific measurement process in step 407 is the same as that in step 206 in fig. 2.
In step 408, the UE sends a measurement report to the base station. In step 408, after performing corresponding measurement according to the CSI-RS functional cell and the corresponding CSI-RS resource information, the UE triggers a measurement report event when the measurement result meets the measurement report condition configured by the base station; and the UE sends a measurement report to the base station, wherein the measurement report carries the index number corresponding to the CSI-RS information resource of the newly added carrier type triggering the measurement reporting condition and a corresponding measured value.
And step 409, the base station performs corresponding processing according to the measurement report of the UE. The specific processing procedure is the same as step 208 described in fig. 2.
In an LTE system, the capacity of a system information block is always limited, and when the capacity of the transmitted CSI-RS resource information is too large, the capacity occupies too many system resources, which may cause a certain impact on other signaling transmissions. Specifically, firstly, parameters in the CSI-RS resource information of all newly added carrier types are traversed, a complete CSI-RS index mapping table is configured according to the obtained parameters, and the CSI-RS index mapping table is written into a standard protocol. In the specific implementation of the present invention, the CSI-RS index mapping table is defined in the 3GPP LTE physical layer protocol. Fig. 5 is a signalling flow diagram of RRM measurements in a fourth embodiment of the invention; as shown in figure 5 of the drawings,
step 501, defining a CSI-RS index mapping table in a protocol. And configuring an index number for each piece of CSI-RS resource information in the CSI-RS index mapping table.
Step 502, the UE camps on a cell.
Step 503, establishing an RRC connection between the UE and the base station.
And step 504, selecting CSI-RS resource information. In step 405, the base station selects CSI-RS resource information that needs to perform CSI-RS RRM measurement according to the actual deployment situation.
And 505, the base station sends an RRC connection reconfiguration message to the UE, wherein the RRC connection reconfiguration message carries the index number corresponding to the selected CSI-RS resource information, the corresponding CSI-RS functional cell and the corresponding reporting configuration condition.
In step 505, the base station searches a corresponding index number in a CSI-RS index mapping table configured in a standard protocol according to the selected CSI-RS resource information. And the base station sends the index number corresponding to the selected CSI-RS resource information, the corresponding CSI-RS functional cell and the measurement reporting condition to the UE through an RRC connection reconfiguration message.
Step 506, the UE performs corresponding measurement according to the selected CSI-RS resource information and the corresponding CSI-RS function cell. And the UE searches corresponding CSI-RS resource information in a CSI-RS index mapping table configured in a standard protocol according to the index number sent by the base station.
In step 507, the UE sends a measurement report to the base station. In step 507, after performing corresponding measurement according to the CSI-RS functional cell and the corresponding CSI-RS resource information, when the measurement result satisfies the measurement reporting condition configured by the base station, the UE triggers a measurement report event, and sends a measurement report to the base station, where the measurement report carries an index number corresponding to the CSI-RS information resource of the newly added carrier type that triggers the measurement reporting condition, and a corresponding measurement value.
And step 508, the base station performs corresponding processing according to the measurement report of the UE. The specific processing procedure is the same as step 208 described in fig. 2.
In a specific embodiment of the present invention, the CSI-RS functional cell includes more than 2 bits, and different measurement purposes of CSI-RS resource information are identified by different state values of the bits. For example, configuring the CSI-RS functional cell into 2 bits, and when the value of the bit is set to 00, the measurement purpose of the identified CSI-RS resource information is RSRP measurement; when the value of the bit is set to be 01, the measurement purpose of the identified CSI-RS resource information is CSI feedback; when the value of the bit is set to be 10, the measurement purpose of the identified CSI-RS resource information is interference measurement; when the value of the set bit is 11, the measurement purpose of the identified CSI-RS resource information is secondary cell management.
In the preferred embodiment of the present invention, the specific steps of the UE performing the corresponding measurement according to the CSI-RS resource information and the corresponding CSI-RS functional cell are:
when the measurement purpose indicated by the CSI-RS function information element is RSRP measurement, the UE measures the signal quality of the current serving cell and the signal quality of the adjacent cell according to the received CSI-RS resource information; when the signal quality of the adjacent cell meets the preset condition, the UE reselects the adjacent cell with better quality from the current serving cell through cell reselection operation; and the corresponding RSRP measurement value or the corresponding RSRQ measurement value is obtained through measurement.
When the measurement purpose indicated by the CSI-RS function information element is CSI feedback, the UE estimates the CSI channel quality according to the received CSI-RS resource information and transmits the obtained CSI feedback to the base station, and the base station can select the CSI for a precoder and a Modulation and Coding Scheme (MCS) for data in turn.
When the measurement purpose indicated by the CSI-RS functional cell is interference measurement, after the sending power of the CSI-RS resource information of the cell is set to zero, the interference power brought by the adjacent cell at the same position is measured according to the received CSI-RS resource information; and calculating the SNR according to the known sending power of the CSI-RS resource information and the interference power at the corresponding position. And scheduling the UE to transmit data according to the SNR value.
When the measurement purpose indicated by the CSI-RS function information element is auxiliary cell management, the UE carries out RSRP/RSRQ measurement according to the received CSI-RS resource information; performing secondary cell management according to the RSRP/RSRQ measurement value;
the secondary Cell is a carrier Cell except a Primary Cell (PCell) in a carrier aggregation scene. Management, such as addition or deletion, of a newly added carrier type cell in a multi-carrier aggregation scenario is referred to as secondary cell management; and the base station determines the UE to aggregate or de-aggregate the corresponding cell of the newly added carrier type by judging the relation between the RSRP/RSRQ measurement value obtained by the RSRP measurement and a preset high threshold value or a preset low threshold value.
For example, if the RSRP/RSRQ measurement value is higher than the preset high threshold, the base station may determine that the signal quality of the measurement cell is good, and notify the UE that the measurement cell may be aggregated; if the RSRP/RSRQ measurement value is lower than a preset low threshold value, the base station can judge that the signal quality of the measurement cell is not good, and informs the UE that the measurement cell can be deaggregated and the measurement cell is not monitored any more; if the RSRP/RSRQ measurement value is between the low threshold value and the high threshold value, the base station can use the measurement cell as an auxiliary cell, the base station can continue to measure and monitor the cell, and whether to aggregate or de-aggregate the measurement cell is selected according to system requirements. That is, different operations are taken according to the RSRP/RSRQ measurement values obtained in the monitoring process.
In an embodiment of the present invention, the configuration measurement reporting condition specifically includes: the base station configures a threshold value for the UE to perform measurement report according to the CSI-RS functional cell, and when a measured value obtained by the UE performing CSI-RS RRM measurement meets a preset threshold value, the UE sends the measurement report to the base station; or the base station configures a period for the UE to perform measurement reporting, and the UE transmits the measurement reporting to the base station at preset time intervals when performing CSI-RS RRM measurement. The specific selection mode can be judged according to the actual situation.
For example, in the case of performing RSRP measurement, the preset threshold includes a high threshold and a low threshold, and when the measured RSRP/RSRQ measurement value is higher than the high threshold or lower than the low threshold, the measurement report is triggered.
The base station performs corresponding processing according to the measurement report sent by the UE, and further includes: the base station needs to judge whether to perform RSRP/RSRQ measurement on the newly added carrier type triggering the reporting event, and if the RSRP/RSRQ measurement value sent by the UE is lower than a low threshold value, it indicates that an adjacent cell corresponding to the RSRP/RSRQ measurement value is a cell far away from the UE, and the adjacent cell is not monitored any more or is deaggregated; if the RSRP/RSRQ measurement value sent by the UE is higher than the high threshold value, it is indicated that the neighboring cell corresponding to the RSRP/RSRQ measurement value is a cell providing better service for the UE, and the UE may be notified to switch to the neighboring cell or aggregate the neighboring cell; if the RSRP/RSRQ measurement value sent by the UE is between the low threshold value and the high threshold value, monitoring the adjacent cell, and performing aggregation/de-aggregation operation according to actual requirements to realize management of the auxiliary cell; and similarly, whether the polymerizable carrier cell is updated or not is judged according to the RSRP/RSRQ measurement value sent by the UE. And sending the judgment result to the UE through an RRC message, and then carrying out corresponding processing by the UE.
In summary, the present invention provides a method for configuring RRM measurement, where a base station configures CSI-RS resource information of a channel state indication reference signal for a newly added carrier type; the base station selects the CSI-RS resource information, configures a CSI-RS functional cell for indicating the measurement purpose of the selected CSI-RS resource information, and configures measurement reporting conditions; notifying the selected CSI-RS resource information, the configured corresponding CSI-RS functional cells and the measurement reporting conditions to the UE; the UE carries out corresponding measurement according to the CSI-RS functional cells notified by the base station and the corresponding CSI-RS resource information; and when the measurement report condition is met, the UE sends a corresponding measurement report to the base station, and the base station performs RRM measurement in a corresponding processing mode according to the measurement report sent by the UE. And the base station establishes a CSI-RS index mapping table and broadcasts the index mapping table through system information. And then, index numbers corresponding to the CSI-RS resource information are configured for the UE through the RRC message, so that the signaling overhead of the RRC message is saved. In addition, by defining the CSI-RS index mapping table in the standard protocol, the signaling overhead of RRC messages and the storage space of the UE can be saved. By adopting the CSI-RS function cell notification U E to perform RRM measurement with different purposes and notifying the UE of the CSI-RS resource information required by the measurement in different ways, the problem of performing R R R M measurement in a scene of introducing a newly added carrier type is solved, and the vacancy of the prior art is made up.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (10)
1. A configuration method for RRM measurement is applied to a scene of introducing a newly added carrier type, and is characterized in that the method comprises the following steps:
the base station configures channel state indication reference signal CSI-RS resource information for the newly added carrier type;
the base station selects the CSI-RS resource information, configures a CSI-RS functional cell for indicating the measurement purpose of the selected CSI-RS resource information, and configures measurement reporting conditions; notifying the selected CSI-RS resource information, the configured corresponding CSI-RS functional cells and the measurement reporting conditions to the UE;
the UE carries out corresponding measurement according to the CSI-RS functional cells notified by the base station and the corresponding CSI-RS resource information;
and when the measurement report condition is met, the UE sends a corresponding measurement report to the base station, and the base station carries out corresponding processing according to the measurement report sent by the UE.
2. The method of claim 1,
the measurement purpose of the CSI-RS resource information comprises the following steps: reference Signal Received Power (RSRP) measurement, Channel State Indication (CSI) feedback, interference measurement and auxiliary cell management;
the CSI-RS functional cell comprises more than 2 bits, and different measurement purposes of CSI-RS resource information are identified by different state values of the bits.
3. The method of claim 2, wherein notifying the UE of the selected CSI-RS resource information, the configured corresponding CSI-RS functional cell, and the measurement reporting condition comprises:
the CSI-RS resource information of one newly added carrier type corresponds to a cell index PCI;
the base station broadcasts CSI-RS resource information of all newly added carrier types through a system information block SIB 2; the UE reads SIB2 through cell residence, acquires CSI-RS resource information of all newly added carrier types and stores the CSI-RS resource information in local;
the base station sends the cell index corresponding to the selected CSI-RS resource information, the configured corresponding CSI-RS functional cell and the measurement reporting condition to the UE through an RRC connection reconfiguration message;
and the UE locally searches the corresponding CSI-RS resource information according to the PCI sent by the base station.
4. The method of claim 2, wherein the notifying the UE of the selected CSI-RS resource information, the configured corresponding CSI-RS functional cell, and the measurement reporting condition comprises:
and sending the selected CSI-RS resource information, the configured corresponding CSI-RS functional cells and the measurement reporting conditions to the UE through a Radio Resource Control (RRC) connection reconfiguration message.
5. The method of claim 2, wherein the notifying the UE of the selected CSI-RS resource information, the configured corresponding CSI-RS functional cell, and the measurement reporting condition comprises:
the base station sets a CSI-RS index mapping table, and an index number is configured for each piece of CSI-RS resource information in the CSI-RS index mapping table;
the base station broadcasts the CSI-RS index mapping table through SIB2, and the UE reads SIB2 through cell residence to acquire the CSI-RS index mapping table and store the CSI-RS index mapping table locally;
the base station searches a corresponding index number in the CSI-RS index mapping table according to the selected CSI-RS resource information, and sends the searched index number, the configured corresponding CSI-RS functional cell and the measurement reporting condition to the UE through an RRC connection reconfiguration message;
and the UE finds the corresponding CSI-RS resource information in a locally stored CSI-RS index mapping table according to the index number sent by the base station.
6. The method of claim 2, wherein the notifying the UE of the selected CSI-RS resource information, the configured corresponding CSI-RS functional cell, and the measurement reporting condition comprises:
configuring a CSI-RS index mapping table in a protocol, and configuring an index number for each piece of CSI-RS resource information in the CSI-RS index mapping table;
the base station searches a corresponding index number in the CSI-RS index mapping table according to the selected CSI-RS resource information, and sends the searched index number, the configured corresponding CSI-RS functional cell and the measurement reporting condition to the UE through an RRC connection reconfiguration message;
and the UE finds the corresponding CSI-RS resource information in a CSI-RS index mapping table stored in the protocol according to the index number sent by the base station.
7. The method according to any one of claims 1 to 6, wherein the UE performing corresponding measurement according to the CSI-RS function cell notified by the base station and the corresponding CSI-RS resource information includes:
when the measurement purpose indicated by the CSI-RS function information element is RSRP measurement, the UE measures the signal strength of the adjacent cell according to the received CSI-RS resource information;
when the measurement purpose indicated by the CSI-RS functional cell is CSI feedback, the UE carries out CSI estimation according to the received CSI-RS resource information and feeds back the obtained CSI to the base station;
when the measurement purpose indicated by the CSI-RS functional cell is interference measurement, the UE sets the transmission power of a CSI-RS reference signal of the cell to zero, and then measures the interference power of the adjacent cells at the same position according to the received CSI-RS resource information;
and when the measurement purpose indicated by the CSI-RS functional cell is auxiliary cell management, the UE performs auxiliary cell management on the type of the newly added carrier according to the measured RSRP/Reference Signal Received Quality (RSRQ) measurement value.
8. The method of claim 7, wherein configuring the measurement reporting condition comprises:
the base station configures a threshold value for the UE to measure and report according to the CSI-RS functional cell,
when a measured value obtained by the UE through CSI-RS RRM measurement meets a preset threshold value, the UE sends a measurement report to a base station;
or,
and the base station configures the period of measurement reporting of the UE, and the UE sends the measurement reporting to the base station at preset time intervals when carrying out CSI-RS RRM measurement.
9. The method of claim 8, wherein the base station performing corresponding processing according to the measurement report sent by the UE comprises:
when the measurement purpose indicated by the CSI-RS functional cell is RSRP measurement, the base station selects an adjacent cell with signal quality meeting a preset condition according to the RSRP/RSRP measurement value reported by the UE;
when the measurement purpose indicated by the CSI-RS functional cell is CSI feedback, the base station configures a data transmission mode according to channel quality information in the CSI feedback reported by the UE;
when the measurement purpose indicated by the CSI-RS functional cell is interference measurement, the base station estimates the interference condition of the CSI-RS resource of the cell according to the interference power value of the adjacent cell reported by the UE;
and when the measurement purpose indicated by the CSI-RS functional cell is auxiliary cell management, the base station performs auxiliary cell management according to the RSRP/RSRQ measurement value of the newly added carrier type reported by the UE.
10. The method of claim 9, wherein the base station performs corresponding processing according to the measurement report sent by the UE further comprises:
the base station judges whether to carry out RSRP/RSRQ measurement on the newly added carrier type triggering the reporting event and whether to update the polymerizable carrier cell according to a measurement report sent by the UE; and sending the judgment result to the UE through an RRC message.
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