WO2013000305A1 - Method and device for implementing uplink power control - Google Patents

Abstract

The present application relates to the field of communications. Disclosed are a method and device for implementing uplink power control, for balancing up/downlink transmit power and improving the accuracy of uplink power control. The method is as follows: performing downlink transmission path loss measurement by a base station according to a designated reference signal by rationally scheduling UE on the basis of reference signal related information, or performing downlink transmission path loss measurement by the UE actively selecting at least one reference signal from the received reference signals, and the UE correspondingly adjusting the uplink transmit power of the present UE according to the measurement result, i.e. performing uplink power control on an open loop. In this way, flexible and accurate downlink transmission path loss measurement on one or more reference signal transmitting ends can be realized based on path loss measurement requirements, and in turn uplink power control can be performed accurately, balancing up/downlink transmit power and improving the accuracy of uplink power control.

Description

 Method and apparatus for implementing uplink power control. The present application claims to be filed on June 30, 2011 by the Chinese Patent Office, Application No. 201110182548.9, entitled "A Method and Apparatus for Implementing Upstream Power Control" Priority is hereby incorporated by reference in its entirety.

Technical field

 The present invention relates to the field of communications, and in particular, to a method and apparatus for implementing uplink power control.

Background technique

 The Radio Radio Head (RRH), also known as the RRU, RRE, distributed antenna, etc., is a radio unit separated from the Base Band Unit (BBU). Usually, the RRH and the BBU are used. Placed in different geographical locations. The RRH includes components such as RF circuits, A/D conversion, D/A conversion, and optical transmission modules. The RRH is connected to the BBU through optical fibers.

 The distributed RRH is a network form that uses the RRH network. The RRH is dispersed in a cell. Because the distance from the terminal is small, the terminal can provide high-profile communication services to the terminal. Since all RRH data in a cell are processed centrally by the BBU, this brings about the possibility of efficient cooperation between RRHs. Therefore, distributed RRH becomes an important scenario for collaborative multi-point transmission (CoMP) research. In a practical application, the deployment of the distributed RRH can be divided into a scenario without a macro base station and a scenario with a macro base station. Among them, a scenario with a macro base station generally uses an increased RRH based on an existing network. The local area hotspot coverage is satisfied, that is, the RRH does not need to cover all locations, so the geographic location of the RRH is generally random (related to the location where the hotspot occurs). For example, referring to FIG. 1, an eNodeB (ie, a macro base station) implements cell coverage through a base station tower, that is, Cell 0, and there are multiple hotspots in Cell 0, which are called Cell 1, Cell 2, Cell 3, and Cell 4. The eNodeB implements coverage of these hotspots through multiple RRHs.

 In the scenario of a macro base station, the cell ID of the RRH and the cell ID of the macro base station may be the same or different. However, when the cell IDs of the RRH and the macro base station are the same, the existing method for performing uplink power control is as follows:

Generally, the macro base station and the RRH send the same cell-specific reference signals (CRS) to the terminal (UE), that is, the transmission power of the two is different, and other information (for example, the physical resource location occupied by the CRS) is completely Similarly, the transmission power of the RRH is lower than the transmission power of the macro base station. The CRS received by the UE is a superposition of the CRS sent by the macro base station and the RRH, and the UE performs path loss measurement according to the superimposed CRS, and then performs uplink power control according to the measurement result; accordingly, the base station and the RRH receive in the uplink transmission process. The signal transmitted by the UE, and the transmission power used by the UE for both is the same. Obviously, in the prior art, the transmission power of the RRH transmitting CRS is lower than the transmission power of the CRS used by the macro base station, and the UE performs the path loss measurement according to the superposition result of the CRS sent by the RRH and the macro base station, based on the measurement. As a result, uplink power control introduces large errors; for example, when the UE When the RRH is close to an RRH, the actual path loss between the RRH and the UE is small. However, if the UE performs path loss measurement based on the superimposed CRS, the transmission power of the CRS used by the macro base station is larger. The resulting measurement result is too large, which may be much larger than the actual path loss between the UE and the RRH, so that when the uplink power control is implemented (that is, the same uplink transmission power is used for both the macro base station and the RRH), the uplink transmission is caused. The waste of power; on the other hand, if the UE is far away from the macro base station, the actual path loss between the macro base station and the UE is large, but if the UE performs path loss measurement according to the superimposed CRS, the transmission power of the CRS is transmitted by the RRH. The value is small, and the measurement result obtained is too small, which may be much smaller than the actual path loss between the UE and the macro base station, so that the uplink power control is implemented (that is, the same uplink transmit power is used for both the macro base station and the RRH). ), causing insufficient uplink transmit power.

 In summary, in the current uplink power control process, the UE needs to perform downlink path loss measurement to adjust the uplink transmit power. The existing path loss measurement is based on the received power and transmission power of the CRS, and the measurement result is obtained by the ratio of the two. However, in some CoMP scenarios, if there are thousands of RRHs and the same cell ID used by the macro base station, the macro base station and the RRH transmit CRS to the UE, and the UE usually performs path loss measurement according to the superimposed CRS, due to the base station and The CRS transmission power of the RRH is different, and the path loss to the UE is also different. The UE superimposes the CRS and the CRS transmitted by the macro base station to perform path loss measurement, which results in the estimated measurement result and the actual uplink path loss of the UE. Compared with a large error, the uplink transmission power is too large or too small.准确性 The accuracy of path loss measurement in this way is not as accurate as the measurement of path loss by a single transmission point.

 Obviously, the existing imbalance of uplink and downlink power transmission makes the accuracy of downlink path loss measurement and uplink power control difficult to guarantee. Summary of the invention

 The embodiment of the invention provides a method and a device for implementing uplink power control, which are used for balancing uplink and downlink transmission power and improving the accuracy of uplink power control.

 The technical solution provided by the embodiment of the present invention is as follows:

 A method of implementing uplink power control, comprising:

 Receiving, by the terminal, reference signal related information sent by the base station, where the reference signal related information is used to indicate to the terminal a reference signal used when performing downlink transmission path loss measurement;

 The terminal performs downlink transmission path loss measurement on the transmitting end of the reference signal according to the obtained reference signal related information, and performs open loop uplink power control based on the measurement result.

 A method of implementing uplink power control, comprising:

 Receiving, by the terminal, at least one reference signal sent by the transmitting end;

The terminal selects at least one reference signal from the received reference signals, performs downlink transmission path loss measurement on the transmitting end of the selected reference signal, and performs open loop uplink power control based on the measurement result; The terminal feeds back association information of at least one reference signal used for downlink transmission path loss measurement to the base station. An apparatus for implementing uplink power control, comprising:

 An acquiring unit, configured to acquire preset reference signal related information, where the reference signal related information is used to indicate, to the terminal, a reference signal used when performing downlink transmission path loss measurement;

 The communication unit is configured to send the reference signal related information to the terminal, so that the terminal performs downlink transmission path loss measurement on the transmitting end of the reference signal according to the obtained reference signal related information, and performs open loop uplink power control based on the measurement result.

 An apparatus for implementing uplink power control, comprising:

 a communication unit, configured to receive reference signal related information sent by the base station, where the reference signal related information is used to indicate to the terminal a reference signal used when performing downlink transmission path loss measurement;

 And an execution unit, configured to perform downlink transmission path loss measurement on the transmitting end of the reference signal according to the obtained reference signal related information, and perform open loop uplink power control based on the measurement result.

 An apparatus for implementing uplink power control, comprising:

 a communication unit, configured to receive a reference signal sent by at least one transmitting end;

 An execution unit, configured to select at least one reference signal from the received reference signals, perform downlink transmission path loss measurement on the transmitting end of the selected reference signal, and perform open loop uplink power control based on the measurement result;

 And a feedback unit, configured to feed back association information of the at least one reference signal used for downlink transmission path loss measurement to the base station.

 In the embodiment of the present invention, the base station may reasonably schedule the downlink transmission path loss measurement according to the specified reference signal by the base station according to the measurement requirement, or may actively select at least one reference signal from the received reference signal by the UE. The downlink transmission path loss measurement is performed, and the UE adjusts the uplink transmission power of the UE according to the measurement result, that is, performs uplink power control of the open loop. Obviously, in this embodiment, the UE does not need to distinguish which transmission end is the path loss measurement object, but uses the reference signal received at the corresponding physical resource location to perform downlink transmission path loss measurement according to the scheduling or actively selected result of the base station. The scheduling mode of the base station and the active selection mode of the UE can be preset according to the path loss measurement requirement, so that flexible and accurate downlink transmission path loss measurement for one or more transmitting ends can be realized based on the path loss measurement requirement, and accurate is obtained. The measurement result can further accurately control the uplink power, effectively improve the accuracy of the uplink power control, avoid the waste and shortage of the uplink transmission power configuration, balance the uplink and downlink transmission power, and help improve the system performance. DRAWINGS

 FIG. 1 is a schematic diagram of a distributed RRH scenario in the prior art;

 2 is a schematic diagram of a reference signal pattern in an embodiment of the present invention;

3 is a schematic structural diagram of a function of a base station according to an embodiment of the present invention; 4A and FIG. 4B are schematic diagrams showing a functional structure of a UE according to an embodiment of the present invention;

 FIG. 5 is a flowchart of uplink power control performed by a base station scheduling UE in an open loop according to an embodiment of the present invention;

 FIG. 6 is a flowchart of uplink power control for a UE to actively implement open loop in an embodiment of the present invention. detailed description

 In the application scenario of the CoMp technology, in order to balance the uplink and downlink transmission power and improve the accuracy of the uplink power control, in the embodiment of the present invention, the reference signal related information may be notified to the UE by the base station in advance, and the reference signal related information is used to indicate to the UE. The reference signal used for downlink transmission path loss measurement; there are multiple reference signals at the transmitting end, and the reference signal related information set for each transmitting end may be partially/all the same, or may be completely different, and managed by the base station uniformly, the base station Determining the downlink transmission path loss measurement according to the reference signals sent by the transmitting end, and transmitting the corresponding reference signal related information to the UE, so that the UE performs the downlink transmission path loss measurement according to the obtained reference signal related information and performs the measurement based on the measurement result. Uplink power control of the ring. Alternatively, the UE may directly receive the reference signal sent by the at least one transmitting end, and select at least one reference signal from the received reference signal to perform downlink transmission path loss measurement, and perform open loop uplink power control based on the measurement result, and finally The UE feeds back information about the at least one reference signal used for downlink transmission path loss measurement to the base station. The so-called multiple transmitting ends may be the RRHs under the base station and the base station, or may be a base station and multiple relay nodes (relays).

 In practical applications, preferably, the reference signal may be a channel state information reference signal (CSI-RS), a CRS, a Demodulation Reference Symbol (DMRS), or a newly defined reference signal. The reference signal related information includes one or a combination of the following parameters of the reference signal: time-frequency resource information, transmission bandwidth information, downlink transmission power information, and ID configuration information used for generating the scrambling sequence; wherein, the time-frequency resource information of the reference signal The actual downlink transmit power of the reference signal may be the ratio of the actual downlink transmit power of the reference signal to the downlink transmit power of the other preset reference signals, or may be the pattern of the reference signal (as shown in FIG. 2 ). The actual downlink transmit power quantized by the reference signal.

 In the actual application, the reference signal related information may also refer to the cell ID corresponding to the signal, the sequence corresponding to the reference signal to generate the ID, the period of the reference signal, and the like, and details are not described herein again.

 Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

 As shown in FIG. 3, in the embodiment of the present invention, the base station includes an obtaining unit 30 and a communication unit 31, where the acquiring unit 30 is configured to acquire preset reference signal related information, where the reference signal related information is used to indicate to the UE. a reference signal used in downlink transmission path loss measurement;

The communication unit 31 is configured to send the obtained reference signal related information to the UE, and enable the UE to perform downlink transmission path loss measurement on the transmitting end of the reference signal according to the obtained reference signal related information, and perform open loop uplink power control based on the measurement result. Referring to FIG. 4A and FIG. 4B, in the embodiment of the present invention, the UE includes a communication unit 40 and an execution unit 41, where

 The communication unit 40 is configured to receive reference signal related information that is sent by the base station, where the reference signal related information is used to indicate, to the UE, a reference signal used when performing downlink transmission path loss measurement;

 The executing unit 41 is configured to perform downlink transmission path loss measurement on the transmitting end of the reference signal according to the obtained reference signal related information, and perform open loop uplink power control based on the measurement result.

 Alternatively, the UE includes a communication unit 40, an execution unit 41, and a feedback unit 42, wherein

 The communication unit 40 is configured to receive a reference signal sent by the at least one transmitting end;

 The executing unit 41 is configured to select at least one reference signal from the received reference signals, perform downlink transmission path loss measurement on the transmitting end of the selected reference signal, and perform open loop uplink power control based on the measurement result;

 The feedback unit 42 is configured to feed back association information of at least one reference signal used for downlink transmission path loss measurement to the base station.

 Based on the foregoing technical solution, referring to FIG. 5, taking the reference signal as CSI-RS as an example, the detailed process of implementing the path loss measurement and uplink power control by the base station scheduling UE is as follows:

 Step 500: The base station acquires preset reference signal related information, where the reference signal related information is used to indicate to the UE the CSI-RS used when performing downlink transmission path loss measurement.

 In this embodiment, the reference signal related information includes time-frequency resource information and downlink transmission power information of the CSI-RS. Referring to FIG. 2, the time-frequency resource information of the CSI-RS can be expressed as a pattern of the CSI-RS, and the so-called pattern refers to a specific transmission position of the CSI-RS in one subframe, which is also called a physical resource location. The validity period of a pattern can be preset, for example, 40ms. After each valid period, the transmitting end will send CSI-RS according to the configured pattern; and the downlink sending power information of CSI-RS can be expressed as the actual of the CSI-RS. The ratio of the downlink transmission power to the downlink transmission power of the preset cell reference signal.

In this embodiment, the reference signal related information of each transmitting end is uniformly managed by the base station, and the base station determines that the downlink transmission path loss measurement needs to be performed according to the reference signals sent by the transmitting end, and then sends corresponding reference signal related information to the UE, because each The reference signal related information of the transmitting end may be partially/all the same, or may be completely different. Therefore, when the base station sends a reference signal related information, the base station may instruct the terminal to perform downlink transmission path loss according to the reference signal sent by the corresponding one or more transmitting ends. When the base station sends a plurality of reference signal related information, the base station may instruct the terminal to perform downlink transmission path loss measurement according to the reference signals sent by the corresponding multiple transmitting ends. The UE does not need to distinguish which transmission end is the path loss measurement object, because the UE can only receive one current path loss to be measured at the corresponding physical resource location according to the time-frequency resource information included in the obtained reference signal related information according to the scheduling of the base station. Or a reference signal sent by multiple transmitting ends. Therefore, in this embodiment, the UE actually performs downlink transmission path loss for the specified one or more transmitting ends according to the scheduling of the base station. Measurement, so that accurate measurement results can be obtained according to the application requirements, and then accurate uplink power control can be performed. Step 510: The base station sends the obtained reference signal related information to the UE, so that the UE performs downlink transmission path loss measurement on the CSI-RS transmitting end according to the obtained reference signal related information, and performs open-loop uplink power control based on the measurement result.

 In this embodiment, when performing step 510, the manner in which the base station sends the reference signal related information to the UE includes, but is not limited to, the following two types:

 The first mode is: the base station passes the physical downlink control channel (Physical Downlink Control Channel,

The PDCCH) signaling or higher layer signaling transmits the obtained reference signal related information to the UE.

 For example, the base station sends a CSI-RS pattern for downlink transmission path loss measurement and corresponding downlink transmission power information to the UE by using PDCCH signaling or higher layer signaling.

 The second mode is: the base station notifies the UE of the index of the reference signal used for the downlink transmission path loss measurement by using the PDCCH signaling or the high layer signaling, so that the UE obtains the reference signal related information preset by the index; wherein, the reference signal The mapping relationship between the index and the reference signal related information may be previously notified by the base station through other high layer signaling, or may be pre-agreed by the base station side and the UE side.

 For example, the base station sends the at least two CSI_RS patterns and the corresponding downlink transmission power information to the UE by using the high layer signaling, and sends the index of the selected CSI-RS pattern to the high layer signaling or the PDCCH. The UE obtains a CSI-RS pattern for downlink transmission path loss measurement and corresponding downlink transmission power information according to the cable I.

 In practical applications, the mapping between the CSI_RS pattern index and the CSI-RS reference signal related information (the time-frequency resource information and the corresponding downlink transmission power information are also bound) may be used by the base station to pass the high layer signaling. The UE may be configured to be configured on the UE side by the base station side and the UE side in advance.

 For another example, the base station sends at least two CSI-RS patterns to the UE by using the high layer signaling, and uses the high layer signaling or the PDCCH signaling to select the index of the selected CSI-RS pattern and the corresponding downlink sending power information. Sending to the UE, the UE obtains a CSI_RS pattern for downlink transmission path loss measurement and corresponding downlink transmission power information according to the cable I.

 In a practical application, the mapping between the CSI-RS pattern index and the CSI-RS reference signal related information may be notified by the base station to the UE through the high layer signaling, or may be determined by the base station side and the UE side in advance and then configured on the UE side. .

 After the base station sends the reference signal related information to the UE, the UE performs downlink transmission path loss measurement on the transmitting end of the reference signal according to the obtained reference signal related information, and performs open loop uplink power control based on the measurement result, where the downlink transmission path loss is performed. The specific implementation of the measurement and uplink power control will be described in detail in the subsequent embodiments.

On the other hand, in this embodiment, in addition to the CSI-RS pattern and the downlink transmission power information, the reference signal related information may further include CSI-RS reference signal measurement port information, and the reference signal measurement port information It is used to notify the specified reference signal measurement port. In practical applications, each of the CSI_RS transmission terminals can send CSI-RS to the UE through multiple ports (the number of ports is usually 2, 4 or 8), and the base station is related to the reference signal. The information includes reference signal measurement port information, and the purpose thereof is to schedule the UE to perform subsequent path loss measurement and uplink power control only according to the reference signal received from the reference signal measurement port specified above.

 Step 520: The UE receives reference signal related information sent by the base station, where the reference signal related information is used to indicate to the UE the CSI-RS used when performing downlink transmission path loss measurement.

 Similarly, in this embodiment, referring to FIG. 2, the time-frequency resource of the CSI-RS may be represented as the CSI-RS pattern, and the downlink transmission power information of the CSI_RS may be represented as the actual downlink of the CSI_RS. The ratio of the transmit power to the downlink transmit power of the preset cell reference signal.

 Corresponding to step 510, in this embodiment, when performing step 520, the manner in which the UE receives the reference signal related information sent by the base station includes but is not limited to the following two types:

 The first mode is: the UE receives the reference signal related information sent by the base station by using PDCCH signaling or high layer signaling.

 For example, the UE receives, by using the PDCCH signaling or the high layer signaling, a CSI-RS pattern and a corresponding downlink transmission power information that are sent by the base station for performing downlink transmission path loss measurement.

 The second mode is: the UE receives an index of a reference signal used by the base station to perform downlink transmission path loss measurement by using PDCCH signaling or high-layer signaling, and acquires reference signal related information corresponding to the index preset.

 For example, the UE receives at least two CSI_RS patterns and corresponding downlink transmission power information sent by the base station by using the high layer signaling, and receives an index of the selected one of the CSI-RS patterns sent by the base station by using PDCCH signaling or higher layer signaling. And obtaining, according to the cable I, a CSI_RS pattern for performing downlink transmission path loss measurement and corresponding downlink transmission power information.

 For example, the UE receives at least two CSI-RS patterns sent by the base station through the high-layer signaling, and receives the index of the selected one of the CSI-RS patterns and the corresponding downlink transmit power sent by the base station through the PDCCH signaling or the high-layer signaling. Information, and according to the cable I, obtain a CSI-RS pattern for downlink transmission path loss measurement and corresponding downlink transmission power information.

 Step 530: The UE performs downlink transmission path loss measurement on the transmitting end of the CSI-RS according to the obtained reference signal related information, and performs open-loop uplink power control based on the measurement result.

 In this embodiment, it is assumed that the base station instructs the UE to perform downlink according to a reference signal sent by one transmitting end.

For transmission path loss measurement, the downlink transmission path loss measurement can be performed in the following manner (for example only):

First, the UE receives the CSI-RS sent by the transmitting end at the corresponding physical resource location according to the CSI-RS pattern included in the obtained reference signal related information, and determines the downlink receiving power of the CSI-RS; Second, the UE determines the received CSI according to the downlink transmit power information included in the obtained reference signal related information.

The actual downlink transmit power of the RS;

 In this embodiment, it is assumed that the downlink transmission power information of the CSI-RS includes the ratio of the actual downlink transmission power of the CSI_RS to the downlink transmission power of the preset cell reference signal, and the downlink transmission power of the cell reference signal is previously on the base station side. And the parameters configured by the UE, the UE obtains the parameter when the cell is registered. Therefore, the UE multiplies the ratio of the actual downlink transmission power of the CSI-RS to the downlink transmission power of the preset cell reference signal by the locally pre-stored cell reference. The downlink downlink transmit power of the signal can be obtained, and the actual downlink transmit power of the CSI-RS can be obtained. On the other hand, if the downlink transmission power information of the CSI-RS includes the actual downlink transmission power of the CSI-RS quantization, it can be used as it is.

 Finally, the UE performs downlink transmission path loss measurement according to the downlink received power of the CSI-RS and the actual downlink transmit power. In practical applications, the ratio of the downlink received power of the CSI_RS to the actual downlink transmit power can be regarded as the measurement result of the path loss measurement. According to the measurement result, the UE can learn the path of the CSI-RS transmission end and the local communication. The loss condition can be used to accurately adjust the local uplink transmit power to adjust to the path loss condition indicated by the measurement result, thereby achieving a balance between uplink and downlink transmit power and avoiding waste or shortage of uplink transmit power.

 On the other hand, it is assumed that the base station instructs the UE to perform downlink transmission according to reference signals sent by multiple transmitting ends.

The transmission path loss measurement, that is, the base station scheduling UE combines the path loss conditions of multiple transmission ends to perform uplink power control, and the UE may separately perform independent downlink transmission paths for the transmission end of each reference signal according to the execution manner of the downlink transmission path loss measurement described above. Loss measurement, and then calculate the final path loss measurement value based on multiple measurement results (eg, average, geometric average, etc.), and finally, perform uplink power control based on the final joint path loss measurement value; or The UE may also perform joint downlink transmission path loss measurement according to the downlink receiving power of the received multiple reference signals, calculate a joint path loss measurement value, and perform uplink power control according to the joint path loss measurement value.

 On the other hand, if the reference signal related information received by the UE further includes reference signal measurement port information, the reference signal measurement port information is used to notify the designated reference signal measurement port, and after receiving the reference signal related information, the UE only The CSI-RS received from the reference signal measurement port performs subsequent downlink transmission path loss measurement and open-loop uplink power control.

 Different from the foregoing embodiment, in another case, the UE may also actively select a path loss measurement object without relying on the notification of the base station, and perform open loop uplink power control according to the measurement result. As shown in Figure 6, the reference flow is still CSI_RS. The detailed procedure of the UE to implement downlink transmission path loss measurement and uplink power control is as follows: Step 600: The UE receives at least one CSI-RS sent by the transmitting end.

In this embodiment, the reference signal received by the UE may be a CRS, a DMRS, or a newly defined reference signal. In this embodiment, only CSI_RS is taken as an example. Step 610: The UE selects at least one CSI-RS from the received CSI-RS, performs downlink transmission path loss measurement on the selected CSI-RS transmitting end, and performs open-loop uplink power control based on the measurement result.

 If the UE receives the reference signals sent by multiple transmitting ends, the UE may select some or all of the reference signals to perform downlink transmission path loss measurement respectively.

 In this embodiment, assuming that the UE selects a reference signal for downlink transmission path loss measurement, the downlink transmission path loss measurement may be performed in the following manner (for example only):

 First, the UE determines the downlink received power of the selected one CSI-RS.

 Next, the UE determines the actual downlink transmission power of the CSI_RS according to the downlink transmission power information included in the reference signal related information corresponding to one CSI-RS.

 In this embodiment, it is assumed that the downlink transmission power information of the CSI-RS includes a ratio of the actual downlink transmission power of the CSI_RS to the corresponding downlink transmission power of the data (referred to as a ratio 1), and the ratio 1 is only a relative value. It can be used for the estimation and adjustment of the CQI (channel shield information), and the base station can send the ratio of the downlink downlink transmit power of the data to the downlink transmit power of the preset cell reference signal (ratio 2) to the UE, and the UE according to the ratio 1 and the ratio 2 The actual downlink transmission power of the above CSI-RS is obtained by multiplying the downlink pre-stored cell reference signal downlink transmission power.

 Finally, the UE performs downlink transmission path loss measurement according to the downlink received power and the actual downlink transmit power of the selected one reference signal.

 In practical applications, the ratio of the downlink received power of the CSI_RS to the actual downlink transmit power can be regarded as the measurement result of the downlink transmission path loss measurement. According to the measurement result, the UE can know that the CSI-RS transmission end communicates with the local. The path loss condition can be used to accurately adjust the local uplink transmit power to adjust the path loss condition of the measurement result, thereby achieving the balance between the uplink and downlink transmit power and avoiding the waste or shortage of the uplink transmit power.

 On the other hand, if the UE selects multiple reference signals for downlink transmission path loss measurement, the UE may

Performing independent downlink transmission path loss measurement for each of the reference signal transmission ends according to the execution manner of the downlink transmission path loss measurement described above, and then calculating the final path loss measurement value according to the plurality of measurement results (eg, averaging, Taking the geometric mean, etc.), and finally, performing uplink power control according to the final joint path loss measurement value; or, the UE may perform joint downlink transmission path loss measurement according to the downlink received power of the selected multiple reference signals, and calculate The joint path loss measurement value is output, and the uplink power control is performed according to the joint path loss measurement value.

 Step 620: The UE feeds back information about at least one CSI-RS used for downlink transmission path loss measurement to the base station.

In the foregoing embodiment, in order to further improve the accuracy of the uplink power control, after the UE performs downlink transmission path loss measurement and open loop uplink power control for a transmitting end, the CSI-RS used for downlink transmission path loss measurement should be used. The relevant information is fed back to the base station, and the related information includes one or any combination of the following information: CSI - RS Index, CSI-RS pattern, CSI-RS transmitter cell ID, CSI_RS strength measurement information (eg, downlink receive power) and CSI-RS measurement port information. The actual downlink transmission power of the CSI-RS can be obtained locally when the base station can obtain the actual downlink transmission power used by the CSI-RS when the UE transmits the CSI-RS. And according to the actual downlink transmission power and the downlink reception power of the CSI-RS, the path loss measurement is performed again, and the closed-loop uplink power control is performed according to the measurement result, and the control result is notified to the UE. In this way, the uplink power control of the open loop and the closed loop is continuously performed, which can effectively improve the accuracy of the uplink power control, and enable the UE to obtain accurate uplink transmit power. Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the present invention is in the form of a computer program product embodied on one or more computer-usable storage interfaces (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program code.

 The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each process and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

 The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

 These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

Although the preferred embodiment of the invention has been described, it will be apparent to those skilled in the art that, Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and the modifications and It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

Claims

Rights request

 A method for implementing uplink power control, comprising:

 The base station acquires preset reference signal related information, where the reference signal related information is used to indicate to the terminal a reference signal used when performing downlink transmission path loss measurement;

 The base station sends the reference signal related information to the terminal, so that the terminal performs downlink transmission path loss measurement on the transmitting end of the reference signal according to the obtained reference signal related information, and performs open loop uplink power control based on the measurement result.

 2. The method according to claim 1, wherein the reference signal is a channel state information reference signal CSI-RS, a cell-specific reference signal CRS, a demodulation reference signal DMRS, or a newly defined reference signal.

 3. The method according to claim 1, wherein the reference signal related information comprises one or a combination of the following parameters of the reference signal:

 Time-frequency resource information, transmission bandwidth information, downlink transmission power information, and ID configuration information used for generating a scrambling sequence;

 The downlink transmit power information of the reference signal is a ratio of an actual downlink transmit power of the reference signal to a downlink transmit power of the other preset reference signals, or an actual downlink transmit power quantized by the reference signal.

 The method according to claim 1, 2 or 3, wherein the base station sends the reference signal related information to the terminal, including:

 Transmitting, by the base station, the reference signal related information to the terminal by using physical downlink control channel PDCCH signaling or high layer signaling; or

 The base station notifies the terminal of the index of the reference signal used in the downlink transmission path loss measurement by using the PDCCH signaling or the high layer signaling, so that the terminal acquires the reference signal related information corresponding to the index preset.

 The method according to claim 1, 2 or 3, wherein the reference signal related information further comprises reference signal measurement port information, the reference signal measurement port information is used to notify the designated reference signal measurement port, After the base station sends the reference signal related information to the terminal, the terminal performs subsequent downlink transmission path loss measurement and open loop uplink power control according to the reference signal received from the designated reference measurement port.

 6. A method for implementing uplink power control, characterized in that:

 Receiving, by the terminal, reference signal related information sent by the base station, where the reference signal related information is used to indicate to the terminal a reference signal used when performing downlink transmission path loss measurement;

 The terminal performs downlink transmission path loss measurement on the transmitting end of the reference signal according to the obtained reference signal related information, and performs open-loop uplink power control based on the measurement result.

 7. The method according to claim 6, wherein the reference signal is a channel state information reference signal

CSI-RS, cell-specific reference signal CRS, demodulation reference signal DMRS, or newly defined reference signal.

8. The method according to claim 6, wherein the reference signal related information comprises one or a combination of the following parameters of the reference signal:

 Time-frequency resource information, transmission bandwidth information, downlink transmission power information, and ID configuration information used for generating a scrambling sequence;

 The downlink transmit power information of the reference signal is a ratio of an actual downlink transmit power of the reference signal to a downlink transmit power of the other preset reference signals, or an actual downlink transmit power quantized by the reference signal.

 The method according to claim 6, 7 or 8, wherein the terminal receives the reference signal related information sent by the base station, and the method includes:

 Receiving, by the terminal, the reference signal related information sent by the base station by using physical downlink control channel PDCCH signaling or high layer signaling; or

 The terminal receives an index of a reference signal used by the base station to perform downlink transmission path loss measurement by using PDCCH signaling or high-layer signaling, and acquires reference signal related information corresponding to the index preset.

 The method according to claim 6, 7 or 8, wherein the reference signal related information further comprises reference signal measurement port information, wherein the reference signal measurement port information is used to notify the designated reference signal measurement port, After receiving the reference signal related information sent by the base station, the terminal performs subsequent downlink transmission path loss measurement and open loop uplink power control only according to the reference signal received from the specified reference measurement port.

 11. A method for implementing uplink power control, characterized in that:

 Receiving, by the terminal, at least one reference signal sent by the transmitting end;

 The terminal selects at least one reference signal from the received reference signals, performs downlink transmission path loss measurement on the transmitting end of the selected reference signal, and performs open loop uplink power control based on the measurement result;

 The terminal feeds back information about at least one reference signal used for downlink transmission path loss measurement to the base station.

 The method according to claim 11, wherein the reference signal is a channel state information reference signal CSI-RS, a cell-specific reference signal CRS, a demodulation reference signal DMRS, or a newly defined reference signal.

 The method according to claim 11 or 12, wherein the related information of the reference signal comprises one or any combination of the following information:

 The index of the reference signal;

 Time-frequency resource information of the reference signal;

 a cell identifier ID corresponding to the reference signal;

 Strength measurement information of the reference signal;

The reference signal measures the port information.

14. An apparatus for implementing uplink power control, comprising:

 An acquiring unit, configured to acquire preset reference signal related information, where the reference signal related information is used to indicate, to the terminal, a reference signal used when performing downlink transmission path loss measurement;

 And a communication unit, configured to send the reference signal related information to the terminal, and enable the terminal to perform downlink transmission path loss measurement on the transmitting end of the reference signal according to the obtained reference signal related information, and perform open loop uplink power control based on the measurement result.

 15. The apparatus according to claim 14, wherein the reference signal related information comprises one or a combination of the following parameters of the reference signal:

 Time-frequency resource information, transmission bandwidth information, downlink transmission power information, and ID configuration information used for generating a scrambling sequence;

 The downlink transmit power information of the reference signal is a ratio of an actual downlink transmit power of the reference signal to a downlink transmit power of the other preset reference signals, or an actual downlink transmit power quantized by the reference signal.

 The device according to claim 14 or 15, wherein the communication unit is specifically configured to: send, by the communication unit, the reference signal related information to the terminal by using physical downlink control channel PDCCH signaling or high layer signaling; Or,

 The communication unit notifies the terminal of the index of the reference signal used in the downlink transmission path loss measurement by using the PDCCH signaling or the high layer signaling, so that the terminal acquires the reference signal related information corresponding to the index preset.

 The apparatus according to claim 14 or 15, wherein the reference signal related information further includes reference signal measurement port information, where the reference signal measurement port information is used to indicate that the terminal uses the transmitting end Transmitting at least one port of the reference signal, the communication unit sending the reference signal related information to the terminal, and causing the terminal to perform subsequent path loss measurement and open loop uplink power control only according to the reference signal sent by the at least one port .

 18. An apparatus for implementing uplink power control, comprising:

 a communication unit, configured to receive reference signal related information sent by the base station, where the reference signal related information is used to indicate to the terminal a reference signal used when performing downlink transmission path loss measurement;

 And an execution unit, configured to perform downlink transmission path loss measurement on the transmitting end of the reference signal according to the obtained reference signal related information, and perform open-loop uplink power control based on the measurement result.

 19. The apparatus according to claim 18, wherein the reference signal related information comprises one or a combination of the following parameters of the reference signal:

Time-frequency resource information, transmission bandwidth information, downlink transmission power information, and ID configuration information used for generating a scrambling sequence; The downlink transmit power information of the reference signal is a ratio of an actual downlink transmit power of the reference signal to a downlink transmit power of other preset reference signals, or an actual downlink transmit power quantized by the reference signal.

 The device according to claim 18 or 19, wherein the communication unit is specifically configured to: receive, by the communication unit, the reference signal related information sent by the base station by using physical downlink control channel PDCCH signaling or high layer signaling; Or,

 The communication unit receives an index of a reference signal used by the base station to perform downlink transmission path loss measurement by using PDCCH signaling or higher layer signaling, and acquires reference signal related information corresponding to the index preset.

 The apparatus according to claim 18 or 19, wherein the reference signal related information further includes reference signal measurement port information, the reference signal measurement port information is used to notify the designated reference signal measurement port, After the communication unit receives the reference signal related information sent by the base station, the executing unit performs subsequent downlink transmission path loss measurement and open loop uplink power control only according to the reference signal received from the specified reference measurement port.

 22. An apparatus for implementing uplink power control, comprising:

 a communication unit, configured to receive a reference signal sent by at least one transmitting end;

 An execution unit, configured to select at least one reference signal from the received reference signals, perform downlink transmission path loss measurement on the transmitting end of the selected reference signal, and perform open loop uplink power control based on the measurement result;

 And a feedback unit, configured to feed back association information of the at least one reference signal used for downlink transmission path loss measurement to the base station.