WO2019087369A1

WO2019087369A1 - User device, and transmission power control method

Info

Publication number: WO2019087369A1
Application number: PCT/JP2017/039820
Authority: WO
Inventors: 真平安川; 聡永田
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2017-11-02
Filing date: 2017-11-02
Publication date: 2019-05-09

Abstract

Provided is a user device in a wireless communication system, wherein the user device comprises: a signal reception unit that receives the size of a transmission power control command; and a transmission power control unit that carries out transmission power control using a partial table corresponding to said size or a correspondence mapping table corresponding to said size, both tables being in a mapping table indicating the correspondence between a transmission power control command value and a power offset value.

Description

User apparatus and transmission power control method

The present invention relates to transmission power control in a wireless communication system.

Currently, unmanned aerial vehicles such as drones have been used in various corporate and individual uses. In the future, the realization of a drone service using a wireless network such as an LTE (Long Term Evolution) network or an NR (New Radio) network is assumed.

Under such an assumption, the feasibility of a specific type (specific type) user equipment (UE) such as a drone has been studied. For example, in the study item "New SID on Enhanced Support for Aerial Vehicles" in 3GPP (Third Generation Partnership Project), the performance evaluation at the time of connecting an unmanned aerial vehicle in the existing ground terminal network, potential problems, improvement techniques etc. It is being considered.

An unmanned aerial vehicle such as a drone can fly at a higher altitude than the base station, and it is assumed that wireless communication is performed in an environment where the whole cell can be seen. Therefore, when the sight line passes the null direction of the base station antenna pattern with the flight of the drone (user apparatus), it is assumed that the path loss between the base station and the drone (user apparatus) greatly fluctuates. In that case, there is a possibility that the transmission power control in the user apparatus can not follow the fluctuation of the path loss. In addition, such a subject is a subject which may arise not only in a drone but in a user apparatus in general.

The present invention has been made in view of the above-described point, and an object of the present invention is to provide a technology that enables a user apparatus to appropriately perform transmission power control even when path loss fluctuates significantly.

According to the disclosed technology, a user equipment in a wireless communication system,
A signal receiving unit for receiving a size of a transmission power control command from a base station;
Transmission that performs transmission power control using a partial table corresponding to the size in the mapping table, which is a table indicating the correspondence between the value of the transmission power control command and the power offset value, or the corresponding mapping table corresponding to the size There is provided a user apparatus characterized by comprising: a power control unit.

According to the disclosed technology, a technology is provided which enables the user apparatus to appropriately perform transmission power control even when path loss fluctuates significantly.

FIG. 1 is a schematic view showing a wireless communication system in an embodiment of the present invention. It is a figure which shows the example of a sequence of transmission power control. It is a figure which shows the parameter in determination of the transmission power of PUSCH. It is a figure which shows the parameter in determination of the transmission power of SRS. It is a figure which shows the example of the power offset in TPC command. It is a figure for demonstrating the subject in drone communication. FIG. 5 is a sequence diagram in the first embodiment. FIG. 8 is a diagram showing an example of a mapping table of TPC commands and power offsets in the first embodiment. FIG. 8 is a diagram showing an example of a mapping table of TPC commands and power offsets in the first embodiment. FIG. 18 is a diagram showing an example of a TPC command in the second embodiment. FIG. 18 is a diagram showing an example of a TPC command in the second embodiment. FIG. 18 is a diagram showing an example of a mapping table of TPC commands and power offsets in the second embodiment. FIG. 8 is a sequence diagram in Embodiment 2. 15 is a flowchart showing an operation of the user apparatus 100 in the third embodiment. FIG. 18 is a diagram showing an example of UL grant in Example 3. FIG. 18 is a diagram showing an example of a mapping table of TPC commands and power offsets in the third embodiment. FIG. 18 is a diagram showing an example of a mapping table of TPC commands and power offsets in the third embodiment. FIG. 18 is a sequence diagram in the fourth embodiment. FIG. 18 is a diagram showing an example of correspondence between subframes and a mapping table in the fourth embodiment. FIG. 18 is a sequence diagram in Example 5; FIG. 2 is a diagram showing an example of a functional configuration of a user device 100. FIG. 2 is a diagram showing an example of a functional configuration of a base station 200. It is a figure which shows an example of the hardware constitutions of the user apparatus 100 and the base station 200. FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the embodiments described below are merely examples, and the embodiments to which the present invention is applied are not limited to the following embodiments.

The radio communication system according to the present embodiment is assumed to support at least the LTE communication scheme. Therefore, when the wireless communication system operates, the existing technology defined by the existing LTE can be used as appropriate. However, the existing technology is not limited to LTE. The present invention is also applicable to communication systems other than LTE.

Although the following embodiments will be described on the assumption of a user apparatus not placed on the ground such as a drone, the present invention is not limited to this, and the present invention provides a ground deployment with a good perspective to a base station. It is also applicable to user devices of the same type.

Also, in the following description, the names of signals, channels, etc. used in existing LTE, such as PDSCH, SIB, SRS, PUSCH, etc., are used, but similar signals and channels may be called by other names. Good.

(Configuration of wireless communication system)
An example of a wireless communication system according to the present embodiment will be described with reference to FIG. FIG. 1 is a diagram showing a wireless communication system in the present embodiment.

As shown in FIG. 1, the wireless communication system 10 includes a user apparatus 100 and a base station 200. The wireless communication system 10 may be, for example, any wireless communication system defined by 3GPP such as an LTE system, an LTE-Advanced system, an NR system, or any other wireless communication system. May be

The user apparatus 100 is any information processing apparatus that can be communicably connected to the base station 200, and may be, for example, without limitation, a drone, an unmanned aerial vehicle, a non-ground-placed user apparatus, or a part thereof. .

The base station 200 performs wireless communication with a large number of user devices including the user device 100 under the control of a higher station (not shown) such as a core network. In the LTE system and the LTE-Advanced system, the base station 200 may be referred to, for example, as an eNB (evolved Node B), and in the NR system, the base station 200 may be referred to, for example, as a gNB. Although only one base station 200 is shown in the illustrated example, a large number of base stations are typically deployed. The coverage of base station 200 is generally referred to as a cell. Moreover, the cell in which the user apparatus 100 is located is called a serving cell.

(About transmission power control)
Since the present embodiment targets uplink transmission power control, first, a basic operation example related to transmission power control in a wireless communication system will be described with reference to FIGS. 2 to 5.

The transmission power when the user apparatus 100 transmits a signal is controlled to an appropriate value so that the base station 200 can demodulate the received signal and the user apparatus 100 does not give unnecessary interference to the surroundings. Need to Therefore, transmission power control (TPC: Transmission Power Control) is performed between the user apparatus 100 and the base station 200 in the wireless communication system according to the present embodiment.

A procedure example of transmission power control will be described with reference to FIG. In S1 (step 1), target received power is broadcasted from the base station 200 to the user apparatus 100 by the SIB2 carried by the PDSCH.

The user apparatus 100 estimates the path loss from the downlink reference signal (DL RS), determines the transmission power of the uplink signal (Sounding RS, PUSCH, PUCCH, etc.) according to the path loss, and transmits the uplink signal with the determined transmission power. To do (S2). This operation (called Open-loop TPC) compensates for the propagation loss. In addition, instantaneous AMC (Adaptive Modulation and Coding) and HARQ follow.

The base station 200 notifies the TPC command based on the received power of the Sounding RS transmitted from the user apparatus 100 (S3). The user apparatus 100 performs error correction of transmission power using this TPC command. This operation is called Closed-loop TPC. More specifically, base station 200 calculates a TPC command which is a correction value based on reception SIR information, and notifies TPC command to user apparatus 100 by UL scheduling grant or TPC-PDCCH (DCI format 3 / 3A). (Non-Patent Document 1). TPC-PDCCH (DCI format 3 / 3A) is a PDCCH for TPC command notification, which enables TPC command notification to a plurality of user apparatuses simultaneously.

A transmission power determination method for PUSCH and SRS will be described as an example.

The user apparatus 100 determines the PUSCH transmission power based on the following equation (Non-Patent Document 2).

P _PUSCH = ₁₀ log ₁₀ (M _PUSCH ) + P _{O _} _PUSCH + α · PL + Δ _TF (TF (i)) + f (i). Formula 1
P _PUSCH ≦ P _CMAX (UE maximum transmission power) formula 2
The parameters in equation 1 above are shown in FIG. Equation 2 _implies that P _CMAX is used as P _PUSCH when the maximum value is exceeded by addition of f (i).

Also, the user apparatus 100 determines the SRS transmission power based on the following Equation 3 (Non-Patent Document 2). The parameters are shown in FIG.

P _SRS = P _{SRS_OFFSET} +10 log ₁₀ (M _PUSCH ) + _{PO_PUSCH} + α · PL + Δ _TF (TF (i)) + f (i) formula 3
As described above, P _SRS is the PUSCH transmission power plus P _{SRS_OFFSET} . An example of the mapping between the value of the TPC command and the amount of change of transmission power (referred to as a power offset value) in the existing technology is shown in FIG. 5 (Non-Patent Document 2). Table 5.1.1.1-2 and Table 5.1.1.1-3 defined in Non-Patent Document 2 are shown in FIG. The user apparatus 100 determines a power offset value corresponding to the value of the TPC command received from the base station 200 based on, for example, the mapping between the value of the TPC command and the power offset value shown in FIG. The aforementioned f (i) is calculated based on the power offset value.

It is assumed that the user apparatus 100 in the present embodiment is a drone (or a terminal mounted on a drone). It is assumed that a flying object such as a drone can fly at a higher altitude than the base station, and wireless communication is performed in an environment where the base station can be viewed without obstacles. Therefore, as shown in FIG. 6, when the line of sight passes the null direction of the base station antenna pattern with the flight of the drone (user apparatus 100), there is a path loss between the base station 200 and the drone (user apparatus 100). It is assumed that it fluctuates greatly. In that case, there is a possibility that transmission power control in the user apparatus 100 can not follow the fluctuation of the path loss. More specifically, in the existing technology, the range of the power offset value of the TPC command in the Closed-loop TPC is small, and there is a possibility that the variation of the path loss can not be followed. Hereinafter, Examples 1 to 5 will be described as operation examples for solving the problem. Any one or more of the embodiments 1 to 5 can be implemented in combination.

Example 1
In the first embodiment, a mapping table of TPC command values and UE specific power offset values is used. An example of the processing procedure in the first embodiment will be described with reference to FIG.

The user apparatus 100 connected to the base station 200 transmits its own capability information to the base station 200 in S101. In this capability information, for example, information indicating that the user apparatus 100 has drone capability, or that the user apparatus 100 is a UE of a predetermined specific type, or the user apparatus 100 has a specific uplink transmission power It contains information indicating that it has control capability.

The base station 200 determines that the user equipment 100 has a specific uplink transmission power control capability based on the capability information received in S101 and determines that it is necessary to apply the specific uplink transmission power control, the user equipment specific ( It is transmitted to the user apparatus 100 by upper layer signaling (example: RRC signaling) with UE-specific mapping table of TPC command value and power offset value as setting information (S102).

The user apparatus 100 performs transmission power control using the mapping table received in S102. For example, when determining the transmission power of the PUSCH, the user apparatus 100 refers to the mapping table received in S102, and uses the power offset value corresponding to the value of the TPC command received from the base station 200 to obtain Equation 1 described above. Calculate f (i) in In the calculation here, for example, calculation of the accumulated value of the power offset value is performed.

FIG. 8B shows an example of the above mapping table. FIG. 8A shows the existing mapping table used when the setting in S102 is not made.

Although the power offset values shown in FIGS. 8A and 8B are merely examples, for example, as shown in FIG. 8B, following the large path loss fluctuation by making the absolute value of the power offset value larger than the existing value It is possible.

In the example illustrated in FIG. 7, the base station 200 determines whether to set the UE specific mapping table based on the capability information of S101, but this is an example. For example, when the base station 200 determines that the user apparatus 100 exists in a location with good line of sight based on the received power of the reference signal received from the user apparatus 100, the base station 200 sets a UE specific mapping table for the user apparatus 100 You may do it. Also, the base station 200 sets the UE specific mapping table regardless of the capability or type of the user apparatus 100, and the user apparatus 100 uses the UE specific mapping table or uses the existing technology mapping table. You may decide to do it.

Further, the information notified from the base station 200 to the user apparatus 100 in S102 may be the mapping table itself (that is, the power offset value corresponding to each TPC command) or may be the index of the mapping table. . In the latter case, for example, a plurality of types of mapping tables are preset in the user apparatus 100 in association with the respective indexes, and the user apparatus 100 corresponds to the index received from the base station 200 in S102. Use

When the UE specific mapping table is not set from the base station 200, the user apparatus 100 uses a default table (eg, FIG. 8A). Also, even when the user apparatus 100 does not correspond to the switching of the mapping between the TPC command and the power offset, the default table (for example, FIG. 8A) is used.

(Example 2)
The size of the TPC command in the existing technology (= the number of bits of the TPC Command Field in the DCI format) is 1 bit or 2 bits. In the second embodiment, by connecting bits of the existing TPC command, the size of the TPC command as a whole is expanded, and the range (range) of the power offset value that can be notified by the TPC command is expanded.

9A and 9B show examples of TPC commands transmitted from the base station 200 to the user apparatus 100. FIG. FIG. 9A shows an example of an 8-bit TPC command. FIG. 9B shows an example in which a 1-bit TPC command indicated by A and a 2-bit TPC command indicated by B are concatenated to form a 3-bit TPC command.

In the second embodiment, for example, a mapping table indicating the mapping between TPC command values and power offset values as shown in FIG. 10 is used. The mapping table is defined, for example, for each TPC command size, and the size of the TPC command used for the user apparatus 100 from the base station 200 to the user apparatus 100, the index of the mapping table (the mapping table itself Good) is notified. However, the size of the TPC command may be used as a mapping table index, in which case notification of the mapping table index is unnecessary.

The entire mapping table shown in FIG. 10 is a mapping table corresponding to a 3-bit TPC command. However, by using a part (partial table) of the mapping table, it is also possible to use the mapping table for TPC commands having the number of bits other than 3 bits. For example, in FIG. 10, the partial table shown as "TPC command size # 1" can be used for a 2-bit TPC command. In FIG. 10, the entire table shown as "TPC command size # 2" can be used for 3-bit TPC commands.

An example of the processing procedure in the second embodiment will be described with reference to FIG. The user apparatus 100 connected to the base station 200 transmits its own capability information to the base station 200 in S201 (S201). In this capability information, for example, information indicating that the user apparatus 100 has drone capability, or that the user apparatus 100 is a UE of a predetermined specific type, or the user apparatus 100 has a specific uplink transmission power It contains information indicating that it has control capability.

The base station 200 determines that the user equipment 100 has a specific uplink transmission power control capability based on the capability information received in S201, and determines that it is necessary to apply the specific uplink transmission power control, the user equipment specific ( UE specific) TPC command size (may be information on TPC command format corresponding to the TPC command size) and information on mapping table between TPC command value and power offset value (example: index) as upper layer signaling (example) : Transmit to the user apparatus 100 by RRC signaling (S202). When a common table not dependent on TPC command size (for example, preset in user apparatus 100) is used as a mapping table between TPC command values and power offset values, the mapping table here The notification of the information may not be notified. Also, the index of the TPC command (for example, tpc-Index) may be notified to the user apparatus 100 together with the TPC command size, or the index of the TPC command may be notified separately from the TPC command size.

The user apparatus 100 performs transmission power control using the information such as the TPC command size received in S202. For example, when the user apparatus 100 determines the transmission power of the PUSCH, a partial table corresponding to the size in the common mapping table (eg, FIG. 10) based on the TPC command size (eg, 2 bits) received in S202. And calculate the f (i) in Equation 1 described above using the power offset value corresponding to the value of the TPC command received from the base station 200.

Note that, in the example illustrated in FIG. 11, the base station 200 determines whether to set the UE specific TPC command size and the like based on the capability information of S201, but this is an example. For example, when the base station 200 determines that the user apparatus 100 exists in a location with good line-of-sight based on the received power of the reference signal received from the user apparatus 100, the UE specific TPC command size etc. for the user apparatus 100 May be set. Also, regardless of the capability or type of the user apparatus 100, the base station 200 sets the UE specific TPC command size etc. in the user apparatus 100, and the user apparatus 100 uses the UE specific TPC command size, It may be determined whether to use the existing technology TPC command size.

The user apparatus 100 uses the default TPC command size and mapping table when the UE specific TPC command size is not set from the base station 200.

(Example 3)
Next, Example 3 will be described. In the third embodiment, TPC command notification in UL grant (downlink control information for uplink transmission) is targeted. In the third embodiment, the user apparatus 100 performs switching of the power offset value based on field values other than the TPC command among the fields of UL grant (DCI format 0) received from the base station 200.

An example of the processing procedure executed by the user device 100 in the third embodiment will be described with reference to the flow chat in FIG.

In S301, the user apparatus 100 receives a UL grant from the base station 200. The UL grant includes fields for setting information such as Hopping flag, Resource block assignment, MCS, NDI (New Data Indicator), TPC command and the like.

In S302, the user apparatus 100 determines the mapping table (the mapping table of the value of the TPC command and the power offset value) to be used from the plurality of mapping tables based on the value of the specific field in the UL grant.

For example, in the case where field X in UL grant shown in FIG. 13 is the above-described specific field, for example, user apparatus 100 uses the table shown in FIG. 14A when the value of field X is smaller than N. It is determined to use the table shown in FIG. 14B when the value of field X is N or more.

In S303, the user apparatus 100 executes transmission power control using the value of the TPC command received in S301 (it may be the value of the TPC command of timing different from the timing in S301) and the mapping table determined in S302. Do. For example, when determining the transmission power of the PUSCH, the user apparatus 100 refers to the mapping table determined in S302, and the power offset corresponding to the value of the TPC command received in S301, f (i) in Equation 1 described above. Calculate using the value. In the calculation here, for example, calculation of the accumulated value of the power offset value is performed.

In the third embodiment, the base station 200 notifies the user apparatus 100 of information on one or more mapping tables. For the notification of the mapping table, for example, the procedure described in FIG. 7 in the first embodiment is applied. That is, in S102 of FIG. 7, for example, the base station 100 notifies the user apparatus 100 of information (index or power offset value corresponding to each TPC command) of the table shown in FIG. 14A and the table shown in FIG. In addition, when using the existing table (example: FIG. 5) as any table, the information of the said existing table does not need to be notified.

The specific field (field X) described above is, for example, an MCS field and / or an NDI field. However, it is not necessarily limited to these.

In the high SINR region in which a high MCS index is used with respect to the MCS index which is the value of the MCS field, it is possible to absorb abrupt change of SINR due to passage of a null point or the like by Link adaptation and retransmission. On the other hand, in a low SINR region where a low MCS index is used, there is little room for lowering the MCS by Link adaptation, so compensation by transmission power control is required.

Therefore, when using an MCS field as a specific field, for example, when a MCS index is smaller than a predetermined threshold (case of FIG. 14A), a large power offset value is made to correspond to a specific TPC command value (example: Table in Figure 8B). Also, when the MCS index is equal to or more than the predetermined threshold (case of FIG. 14B), an existing table (eg, the table of FIG. 8A) is used.

Moreover, regarding NDI, when SINR degrades rapidly by null point passage etc., there is a high possibility that retransmission will be performed. For example, by associating a large power addition value with the TPC command value at the time of retransmission, it is possible to compensate for a sharp SINR deterioration.

That is, when using the NDI field as a specific field, for example, when the NDI value is a value indicating retransmission, a large power offset value is associated with the specific TPC command value (eg, the table of FIG. 8B). . Also, when the NDI value is a value indicating new transmission, an existing table (eg, the table of FIG. 8A) is used.

(Example 4)
A fourth embodiment will now be described. In the fourth embodiment, the mapping between the TPC command value and the power offset value is switched for each subframe set.

An example of a process procedure in the fourth embodiment will be described with reference to FIG. The user apparatus 100 connected to the base station 200 transmits its own capability information to the base station 200 in S401. In this capability information, for example, information indicating that the user apparatus 100 has drone capability, or that the user apparatus 100 is a UE of a predetermined specific type, or the user apparatus 100 has a specific uplink transmission power It contains information indicating that it has control capability.

The base station 200 determines that the user apparatus 100 has a specific uplink transmission power control capacity based on the capacity information received in S401, and determines that it is necessary to apply the specific uplink transmission power control, the user apparatus specific ( Information of mapping table of subframe set (a set of subframe numbers) and TPC command value corresponding to the subframe set and power offset value of UE specific) (eg, index or corresponding to each TPC command The power offset value is transmitted to the user apparatus 100 by higher layer signaling (eg, RRC signaling) (S402).

The user apparatus 100 performs transmission power control using the subframe offset received in S402 and the information in the mapping table (S403).

FIG. 16 is a diagram showing an example of the relationship between a subframe set and a mapping table. In the example illustrated in FIG. 16, in S402 described above, the base station 200 transmits, to the user apparatus 100, a combination of subframe set A information and table A information, subframe set B information, and table B information. The set is notified. However, for example, when table A is an existing table (example: FIG. 5), base station 200 notifies user apparatus 100 of only a set of information of subframe set B and information of table B. It is also good. In that case, the user apparatus 100 determines to use the existing table A in the subframe set A (a set other than the subframe set B) that is not notified.

The user apparatus 100 that has received the information shown in FIG. 16 in S402 refers to Table A for the TPC command received in subframes belonging to subframe set A, for example, in determining transmission power of PUSCH in S403. Then, f (i) is calculated using the power offset value corresponding to the value of the TPC command. Also, with respect to the TPC command received in a subframe belonging to subframe set B, user apparatus 100 refers to table B and calculates f (i) using the power offset value corresponding to the value of the TPC command. Do.

The base station 200 grasps the information set in the user apparatus 100 in S402. For example, in the case where the base station 200 needs to increase the transmission power of the user apparatus 100 significantly, the subframe set shown in FIG. In subframe B, a TPC command for increasing transmission power is transmitted to the user apparatus 100.

The control in the fourth embodiment may not be applied to the UL grant, but may be applied only to the downlink control information of only the TPC command (ie, TPC-PDCCH (DCI format 3 / 3A)). This makes it possible to avoid the restriction on PUSCH scheduling.

Note that, in the example illustrated in FIG. 15, the base station 200 determines whether to set a UE specific subframe set or the like based on the capability information of S401, but this is an example. For example, when the base station 200 determines that the user apparatus 100 exists in a location with good line-of-sight based on the received power of the reference signal received from the user apparatus 100, the UE specific subframe set is set to the user apparatus 100. It may be set. Also, the base station 200 sets the UE specific subframe set to the user equipment 100 regardless of the capability or type of the user equipment 100, and whether the user equipment 100 uses the UE specific subframe set or not You may decide

(Example common to Examples 1 to 4)
In the first to fourth embodiments, the mapping table is newly defined with respect to the power offset value corresponding to the value of the TPC command. Alternatively or additionally, to obtain the power offset value in the new mapping table described above with respect to the power offset value in the original mapping table (eg, FIG. 5, FIG. 8A) A scaling factor of may be used. In this case, in the first to fourth embodiments, the scaling factor is notified from the base station 200 to the user apparatus 100 instead of the information in the mapping table. The scaling factor may be determined for each TPC command value, or one scaling factor may be determined for each of a plurality of TPC commands.

The user apparatus 100 calculates the power offset value corresponding to the TPC command value by multiplying the power offset value corresponding to a certain TPC command value in the original mapping table by the scaling coefficient. The calculated power offset value corresponds to the power offset value corresponding to the TPC command value in the UE specific mapping table described in the first to fourth embodiments.

For example, the scaling factor may be set from the base station 20 to the user apparatus 100 by higher layer signaling (eg, S102 in FIG. 7). Also, a plurality of scaling factors may be set in advance in the user apparatus 100, and the base station 200 may be configured to use the scaling factor for the user apparatus 100 in higher layer signaling. If the result obtained by multiplying the existing power offset value by the scaling factor is not an integer, truncation after the decimal point or rounding off after the decimal point may be performed.

(Example 5)
Example 5 will now be described. The fifth embodiment is an embodiment related to path loss compensation related to Open loop TPC in uplink transmission power control. That is, when PUSCH is taken as an example, the portion of α · PL in the following equation 1 is focused.

P _PUSCH = ₁₀ log ₁₀ (M _PUSCH ) + P _{O _} _PUSCH + α · PL + Δ _TF (TF (i)) + f (i). Formula 1
The user apparatus 100 calculates the above path loss (PL) by “PL = (reference signal transmission power notified from the base station) − (RSRP after upper layer filtering application)”. Here, upper layer filtering is, for example, filtering specified as Layer 3 filtering in Non-Patent Document 3, and in the present embodiment, upper layer filtering is assumed to be Layer 3 filtering, but upper layer filtering is assumed. Filtering is not limited to this.

In upper layer filtering, the user apparatus 100 performs filtering on RSRP obtained in measurement of the downlink reference signal according to Equation 4 below.

F _n = (1−α) · F _n−1 + α · M _n equation 4
In the above equation, _Mn is the latest (latest) measurement result received from the physical layer (here, RSRP of the reference signal received by the user apparatus 100 from the base station 200). F _n is the filtered measurement result. F _n-1 is the old filtered result. F ₀ is set to M ₁ (first measurement result). α is 1/2 ^{(k / 4)} , and k is a parameter (filterCoefficient) notified from the base station 200 by the UplinkPowerControl information element. In the present embodiment, the parameter to be notified may be α, k, or any other value that determines α.

In the fifth embodiment, a plurality of parameters are set from the base station 200 to the user apparatus 100 by upper layer signaling as the above parameters, and the user apparatus 100 executes filtering using each parameter, and results obtained by filtering One of them is used for the above-mentioned calculation of PL, and used for uplink transmission power control. Other results are used, for example, in a measurement report.

As an example, in the case where parameter 1 and parameter 2 are set from the base station 200 to the user apparatus 100, the user apparatus 100 uses parameter 1 for RSRP obtained in RSRP measurement periodically performed. The filtering result 1 which is the filtering result and the filtering result 2 which is the filtering result using the parameter 2 are obtained, and one of them is set as PL in uplink transmission power control.

Here, α is 0 ≦ α ≦ 1, but in this range, the filtering result reflects the latest result more greatly as α is larger. That is, it is a short time average.

Therefore, in the fifth embodiment, for example, in the case where the user apparatus 100 is a drone (or when the line of sight to the base station is good), the user apparatus 100 sets the filtering result using the parameter in which α is large to PL. use. This enables transmission power control to follow steep path loss fluctuation.

In addition, with regard to measurement reports for transmission power control or mobility control that does not require tracking of abrupt path loss fluctuation, the user apparatus 100 uses the filtering result using a parameter that is normal α. This makes it possible to avoid adverse effects on mobility.

Note that, as described above, simultaneously performing a plurality of filtering processes using a plurality of parameters is one example. Parameters may be selected according to the application, and one filtering may be performed using one parameter.

FIG. 17 shows the sequence of Example 5 in the case where an additional parameter is notified for the drone. An operation example will be described with reference to FIG.

The user apparatus 100 connected to the base station 200 transmits its own capability information to the base station 200 in S501. In this capability information, for example, information indicating that the user apparatus 100 has drone capability, or that the user apparatus 100 is a UE of a predetermined specific type, or the user apparatus 100 has a specific uplink transmission power It contains information indicating that it has control capability.

The base station 200 determines that the user equipment 100 has a specific uplink transmission power control capability based on the capability information received in S501 and determines that it is necessary to apply the specific uplink transmission power control, the user equipment specific ( As a parameter of UE specific), the parameter which makes alpha in above Formula 4 larger than usual is transmitted to the user apparatus 100 by upper layer signaling (example: RRC signaling) (S502). The user apparatus 100 executes transmission power control using the parameters received in S502 (S503).

Note that, in the example illustrated in FIG. 17, the base station 200 determines whether to set a UE-specific parameter based on the capability information of S501, but this is an example. For example, when the base station 200 determines that the user apparatus 100 exists in a location with good line-of-sight based on the received power of the reference signal received from the user apparatus 100, the base station 200 sets UE specific parameters for the user apparatus 100. You may do it.

(Device configuration)
A functional configuration example of the user apparatus 100 and the base station 200 that execute the operation of the embodiment described above will be described. Each of the user apparatus 100 and the base station 200 has the functions of all the embodiments described in the present embodiment. However, each of the user apparatus 100 and the base station 200 may be provided with the functions of a part of all the examples described in the present embodiment.

<User device 100>
FIG. 18 is a diagram showing an example of a functional configuration of the user apparatus 100. As shown in FIG. As shown in FIG. 18, the user apparatus 100 includes a signal transmission unit 110, a signal reception unit 120, a setting information management unit 130, and a transmission power control unit 140. The functional configuration shown in FIG. 18 is merely an example. As long as the operation according to the present embodiment can be performed, the function classification and the name of the functional unit may be arbitrary.

The signal transmission unit 110 is configured to generate a signal of the lower layer from the information of the upper layer, and wirelessly transmit the signal. The signal receiving unit 120 is configured to wirelessly receive various signals and acquire information of the upper layer from the received signals. The signal receiving unit 120 includes a received power measurement function.

The setting information management unit 130 has a storage unit that stores setting information set in advance and setting information dynamically and / or semi-statically transmitted from the base station 200 or the like. For example, the setting information management unit 130 stores various parameters, a mapping table, a scaling coefficient, and the like. The transmission power control unit 140 performs the transmission power control operation described in the present embodiment. The transmission power control unit 140 may be included in the signal transmission unit 110 and / or the signal reception unit 120.

For example, the signal receiving unit 120 is configured to receive the size of the transmission power control command from the base station, and the signal receiving unit and the transmission power control unit 140 are configured to receive the value of the transmission power control command and the power offset value. Transmission power control is performed using a partial table corresponding to the size in the mapping table, which is a table indicating correspondence, or a corresponding mapping table corresponding to the size. The signal receiving unit 120 receives, from the base station, a connected transmission power control command in which bits of a plurality of transmission power control commands are connected, and the transmission power control unit 140 corresponds to the value of the connected transmission power control command. The power offset value may be obtained from the partial table or the corresponding mapping table.

Also, for example, the signal receiving unit 120 may receive, from the base station, information of the mapping table specific to the user apparatus, which is information of the mapping table indicating the correspondence between the value of the transmission power control command and the power offset value. The transmission power control unit 140 is configured to perform transmission power control using the mapping table.

The signal reception unit 120 is configured to receive from the base station information of a mapping coefficient that is a mapping table indicating correspondence with a power offset value, and that is specific to the user apparatus, and the transmission power control unit 140 The scaling factor is used to perform transmit power control.

Also, for example, the signal transmission unit 110 is configured to transmit the capability information of the user apparatus 100 to the base station, and in the base station, the type of the user apparatus is identified based on the capability information. The signal reception unit 120 receives the mapping table when it is determined that the user apparatus is

Also, for example, the signal receiving unit 120 is configured to receive, from the base station, downlink control information for uplink transmission, and the transmission power control unit 140 is configured based on the value of a specific field in the downlink control information. And a mapping table indicating correspondence between a value of the transmission power control command and a power offset value is determined from among the plurality of mapping tables, and transmission power control is performed using the determined mapping table.

Also, for example, the signal receiving unit 120 may receive, from the base station, information of a subframe set, and a mapping table indicating a correspondence between a value of a transmission power control command and a power offset value used in the subframe set. The transmission power control unit 140 is configured to perform transmission power control using the mapping table in subframes belonging to the subframe set.

Also, for example, the signal receiving unit 120 is configured to measure the received power of the signal received from the base station, and the transmission power control unit 140 performs the filtering process on the received power, and the filtering process is performed. The path loss is calculated using received power, and transmission power control is performed using the path loss, and the signal receiving unit 120 receives a plurality of parameters used for the filtering process from the base station, The transmission power control unit 140 calculates the path loss using the reception power obtained by the filtering process using one specific parameter of the plurality of parameters.

<Base station 200>
FIG. 19 is a diagram showing an example of a functional configuration of the base station 200. As shown in FIG. As shown in FIG. 19, the base station 200 includes a signal transmission unit 210, a signal reception unit 220, a scheduling unit 230, and a setting information management unit 240.

The functional configuration shown in FIG. 19 is merely an example. As long as the operation according to the present embodiment can be performed, the function classification and the name of the functional unit may be arbitrary.

The signal transmission unit 210 is configured to generate a signal of the lower layer from the information of the upper layer and wirelessly transmit the signal. The signal reception unit 220 is configured to wirelessly receive various signals and acquire information of the upper layer from the received signals. In addition, the signal transmission unit 210 includes a function of transmitting information of the mapping table acquired from the setting information management unit 240, various parameters, and the like to the user device 100.

The scheduling unit 230 performs resource assignment to the user apparatus 100 and the like. The setting information management unit 240 includes a storage unit, stores the preset setting information, and has a function of determining and holding the setting information to be set to the user apparatus 100 dynamically and / or semi-statically.

<Hardware configuration>
The block diagrams (FIGS. 18 to 19) used in the description of the above embodiment show blocks in units of functions. These functional blocks (components) are realized by any combination of hardware and / or software. Moreover, the implementation means of each functional block is not particularly limited. That is, each functional block may be realized by one device physically and / or logically connected to a plurality of elements, or directly and two or more physically and / or logically separated devices. And / or indirectly (for example, wired and / or wirelessly) connected, and may be realized by the plurality of devices.

Also, for example, both the user apparatus 100 and the base station 200 in the embodiment of the present invention may function as a computer that performs the process according to the present embodiment. FIG. 20 is a diagram showing an example of a hardware configuration of user apparatus 100 and base station 200 according to the present embodiment. Each of the above-described user device 100 and base station 200 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. Good.

In the following description, the term "device" can be read as a circuit, a device, a unit, or the like. The hardware configuration of the user apparatus 100 and the base station 200 may be configured to include one or more of the devices indicated by 1001 to 1006 shown in the figure, or may be configured without including some devices. May be

Each function in the user apparatus 100 and the base station 200 causes the processor 1001 to perform an operation by reading predetermined software (program) on hardware such as the processor 1001 and the memory 1002, and the communication by the communication apparatus 1004, the memory 1002 And by controlling the reading and / or writing of data in the storage 1003.

The processor 1001 operates, for example, an operating system to control the entire computer. The processor 1001 may be configured by a central processing unit (CPU: Central Processing Unit) including an interface with a peripheral device, a control device, an arithmetic device, a register, and the like.

Also, the processor 1001 reads a program (program code), a software module or data from the storage 1003 and / or the communication device 1004 to the memory 1002, and executes various processing according to these. As a program, a program that causes a computer to execute at least a part of the operations described in the above embodiments is used. For example, the signal transmission unit 110, the signal reception unit 120, the setting information management unit 130, and the transmission power control unit 140 of the user apparatus 100 illustrated in FIG. 18 are realized by a control program stored in the memory 1002 and operated by the processor 1001. May be Also, for example, a control program stored in the memory 1002 of the signal transmission unit 210, the signal reception unit 220, the scheduling unit 230, and the setting information management unit 240 of the base station 200 shown in FIG. It may be realized by The various processes described above have been described to be executed by one processor 1001, but may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The program may be transmitted from the network via a telecommunication line.

The memory 1002 is a computer readable recording medium, and includes, for example, at least one of a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically Erasable Programmable ROM), and a RAM (Random Access Memory). It may be done. The memory 1002 may be called a register, a cache, a main memory (main storage device) or the like. The memory 1002 can store a program (program code), a software module, and the like that can be executed to execute the process according to the embodiment of the present invention.

The storage 1003 is a computer readable recording medium, and for example, an optical disc such as a CD-ROM (Compact Disc ROM), a hard disc drive, a flexible disc, a magneto-optical disc (eg, a compact disc, a digital versatile disc, a Blu-ray A (registered trademark) disk, a smart card, a flash memory (for example, a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, and the like may be used. The storage 1003 may be called an auxiliary storage device. The above-mentioned storage medium may be, for example, a database including the memory 1002 and / or the storage 1003, a server or any other suitable medium.

The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via a wired and / or wireless network, and is also called, for example, a network device, a network controller, a network card, a communication module, or the like. For example, the signal transmission unit 110 and the signal reception unit 120 of the user apparatus 100 may be realized by the communication apparatus 1004. Also, the signal transmission unit 210 and the signal reception unit 220 of the base station 200 may be realized by the communication device 1004.

The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, and the like) that receives an input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that performs output to the outside. The input device 1005 and the output device 1006 may be integrated (for example, a touch panel).

Also, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured by a single bus or may be configured by different buses among the devices.

The user apparatus 100 and the base station 200 each include a microprocessor, digital signal processor (DSP), application specific integrated circuit (ASIC), programmable logic device (PLD), field programmable gate array (FPGA), etc. It may be configured to include hardware, and part or all of each functional block may be realized by the hardware. For example, processor 1001 may be implemented in at least one of these hardware.

(Summary of the embodiment)
As described above, according to the present embodiment, at least the techniques described in the following items are provided.
(Section 1)
A user equipment in a wireless communication system,
A signal receiving unit for receiving a size of a transmission power control command from a base station;
Transmission that performs transmission power control using a partial table corresponding to the size in the mapping table, which is a table indicating the correspondence between the value of the transmission power control command and the power offset value, or the corresponding mapping table corresponding to the size And a power control unit.

The above configuration provides a technology that enables the user apparatus to appropriately perform transmission power control even when the path loss fluctuates significantly.
(Section 2)
The signal receiving unit receives, from the base station, a connected transmission power control command in which bits of a plurality of transmission power control commands are connected.
The user apparatus according to claim 1, wherein the transmission power control unit acquires a power offset value corresponding to a value of the coupled transmission power control command from the partial table or the correspondence mapping table.

With the above configuration, the user apparatus can perform transmission power control based on a large range transmission power control command.
(Section 3)
A user equipment in a wireless communication system,
A signal receiving unit that is information of a mapping table indicating correspondence between a value of a transmission power control command and a power offset value, the information of the mapping table unique to the user apparatus from the base station;
And a transmission power control unit configured to perform transmission power control using the mapping table.

The above configuration provides a technology that enables the user apparatus to appropriately perform transmission power control even when the path loss fluctuates significantly.
(Section 4)
The base station further comprises a signal transmission unit that transmits capability information of the user apparatus to the base station,
When the base station determines that the user apparatus is a user apparatus of a specific type based on the capability information, the signal reception unit receives the mapping table. User equipment according to clause.

With the above configuration, when having a specific function such as, for example, a drone, the user apparatus can perform transmission power control adapted to the specific function.
(Section 5)
A transmission power control method performed by a user apparatus in a wireless communication system, comprising:
Receiving from the base station the size of the transmit power control command;
Performing transmission power control using a partial table corresponding to the size in the mapping table, which is a table indicating the correspondence between the value of the transmission power control command and the power offset value, or the corresponding mapping table corresponding to the size And a transmission power control method characterized by comprising:
(Section 6)
A transmission power control method performed by a user apparatus in a wireless communication system, comprising:
Receiving, from a base station, information of a mapping table specific to the user equipment, which is information of a mapping table indicating a correspondence between a value of a transmission power control command and a power offset value;
Performing transmission power control using the mapping table.
(Section 7)
A user equipment in a wireless communication system,
A signal receiving unit for receiving downlink control information for uplink transmission from a base station;
Based on the value of a specific field in the downlink control information, a mapping table indicating the correspondence between the value of the transmission power control command and the power offset value is determined from among a plurality of mapping tables, and using the determined mapping table And a transmission power control unit that performs transmission power control.
(Section 8)
A user equipment in a wireless communication system,
A signal reception unit that receives, from a base station, a subframe set, and a mapping table information indicating a correspondence between a value of a transmission power control command and a power offset value, which is used in the subframe set;
And a transmission power control unit configured to perform transmission power control using the mapping table in subframes belonging to the subframe set.
(Section 9)
A user equipment in a wireless communication system,
A signal receiving unit that measures the received power of a signal received from a base station;
A transmission power control unit that performs filtering processing on the reception power, calculates path loss using the reception power subjected to the filtering processing, and performs transmission power control using the path loss;
The signal reception unit receives a plurality of parameters used for the filtering process from the base station, and the transmission power control unit is obtained by a filtering process using one specific parameter of the plurality of parameters. And calculating the path loss using received power.

With any of the configurations of the above-mentioned items 5 to 9, there is provided a technique which enables the user apparatus to appropriately perform the transmission power control even when the path loss greatly fluctuates.

(Supplement of the embodiment)
Although the embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art should understand various modifications, modifications, alternatives, replacements, and the like. I will. Although specific numerical examples are used to facilitate understanding of the invention, unless otherwise noted, those numerical values are merely examples and any appropriate values may be used. The division of items in the above description is not essential to the present invention, and the items described in two or more items may be used in combination as necessary, and the items described in one item may be used in another item. It may be applied to the matters described in (unless contradictory). The boundaries of the functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries of physical parts. The operations of multiple functional units may be physically performed by one component, or the operations of one functional unit may be physically performed by multiple components. With regard to the processing procedures described in the embodiment, the order of processing may be changed as long as there is no contradiction. Although the user apparatus 100 and the base station 200 have been described using functional block diagrams for the convenience of the processing description, such an apparatus may be realized in hardware, software or a combination thereof. The software operated by the processor of the user apparatus 100 according to the embodiment of the present invention and the software operated by the processor of the base station 200 according to the embodiment of the present invention are random access memory (RAM), flash memory, read only It may be stored in memory (ROM), EPROM, EEPROM, register, hard disk (HDD), removable disk, CD-ROM, database, server or any other suitable storage medium.

In addition, notification of information is not limited to the aspect / embodiment described herein, and may be performed by other methods. For example, notification of information may be physical layer signaling (for example, Downlink Control Information (DCI), Uplink Control Information (UCI)), upper layer signaling (for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, It may be implemented by broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof. Also, RRC signaling may be referred to as an RRC message, and may be, for example, an RRC connection setup (RRC Connection Setup) message, an RRC connection reconfiguration (RRC Connection Reconfiguration) message, or the like.

Each aspect / embodiment described in the present specification is LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G, 5G, FRA (Future Radio Access), W-CDMA (Registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, UWB (Ultra-Wide Band), The present invention may be applied to a system utilizing Bluetooth (registered trademark), other appropriate systems, and / or an advanced next-generation system based on these.

As long as there is no contradiction, the processing procedure, sequence, flow chart, etc. of each aspect / embodiment described in this specification may be reversed. For example, for the methods described herein, elements of the various steps are presented in an exemplary order and are not limited to the particular order presented.

The specific operation supposed to be performed by the base station 200 in this specification may be performed by the upper node in some cases. In a network of one or more network nodes having a base station 200, various operations performed for communication with the user equipment 100 may be performed by the base station 200 and / or other than the base station 200. It is clear that it may be done by a network node (for example but not limited to MME or S-GW etc). Although the case where one other network node other than the base station 200 has been illustrated above is illustrated, it may be a combination of a plurality of other network nodes (for example, MME and S-GW).

Each aspect / embodiment described in this specification may be used alone, may be used in combination, and may be switched and used along with execution.

The user equipment 100 may be a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, by those skilled in the art. It may also be called a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable term.

Base station 200 may also be referred to by those skilled in the art in terms of NB (Node B), eNB (enhanced Node B), Base Station, or some other suitable terminology.

The terms "determining", "determining" as used herein may encompass a wide variety of operations. "Judgment", "decision" are, for example, judging, calculating, calculating, processing, processing, deriving, investigating, looking up (for example, a table) (Searching in a database or another data structure), ascertaining may be regarded as “decision”, “decision”, etc. Also, "determination" and "determination" are receiving (e.g. receiving information), transmitting (e.g. transmitting information), input (input), output (output), access (Accessing) (for example, accessing data in a memory) may be regarded as “judged” or “decided”. Also, "judgement" and "decision" are to be considered as "judgement" and "decision" that they have resolved (resolving), selecting (selecting), choosing (choosing), establishing (establishing), etc. May be included. That is, "judgment" "decision" may include considering that some action is "judged" "decision".

As used herein, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

As long as "includes", "including", and variations thereof are used in the present specification or claims, these terms as well as the term "comprising" Is intended to be comprehensive. Further, it is intended that the term "or" as used in the present specification or in the claims is not an exclusive OR.

Throughout the present disclosure, when articles are added by translation, such as, for example, a, an, and the in English, these articles are not clearly indicated by the context: May contain multiple things.

Although the present invention has been described above in detail, it is apparent to those skilled in the art that the present invention is not limited to the embodiments described herein. The present invention can be embodied as modifications and alterations without departing from the spirit and scope of the present invention defined by the description of the claims. Accordingly, the description in the present specification is for the purpose of illustration and does not have any limiting meaning on the present invention.

100 user apparatus 110 signal transmitting unit 120 signal receiving unit 130 setting information managing unit 140 transmission power control unit 200 base station 210 signal transmitting unit 220 signal receiving unit 230 scheduling unit 240 setting information managing unit 1001 processor 1002 memory 1003 storage 1004 storage 1004 communication device 1005 Input device 1006 Output device

Claims

A user equipment in a wireless communication system,
A signal receiving unit for receiving a size of a transmission power control command from a base station;
Transmission that performs transmission power control using a partial table corresponding to the size in the mapping table, which is a table indicating the correspondence between the value of the transmission power control command and the power offset value, or the corresponding mapping table corresponding to the size And a power control unit.
The signal receiving unit receives, from the base station, a connected transmission power control command in which bits of a plurality of transmission power control commands are connected.
The user apparatus according to claim 1, wherein the transmission power control unit acquires a power offset value corresponding to a value of the connected transmission power control command from the partial table or the correspondence mapping table.
A user equipment in a wireless communication system,
A signal receiving unit that is information of a mapping table indicating correspondence between a value of a transmission power control command and a power offset value, the information of the mapping table unique to the user apparatus from the base station;
And a transmission power control unit configured to perform transmission power control using the mapping table.
A transmission power control method performed by a user apparatus in a wireless communication system, comprising:
Receiving from the base station the size of the transmit power control command;
Performing transmission power control using a partial table corresponding to the size in the mapping table, which is a table indicating the correspondence between the value of the transmission power control command and the power offset value, or the corresponding mapping table corresponding to the size And a transmission power control method characterized by comprising:
A transmission power control method performed by a user apparatus in a wireless communication system, comprising:
Receiving, from a base station, information of a mapping table specific to the user equipment, which is information of a mapping table indicating a correspondence between a value of a transmission power control command and a power offset value;
Performing transmission power control using the mapping table.