JP6617939B2 - Integrated circuit - Google Patents

Description

  The present disclosure relates to the communication field, and more particularly to integrated circuits in wireless communication systems.

  D2D (device to device) is a new theme in 3GPP LTE Release 12, and the main goal of this consideration is to achieve direct communication between devices. D2D communication can occur within network coverage (for commercial purposes) or can occur outside network coverage (for public safety purposes).

  FIG. 1 is a schematic diagram illustrating two types of scenarios of D2D communication. As illustrated in FIG. 1, in the scenario 100 </ b> A illustrated on the left side of FIG. 1, two wireless devices 101 and 102 perform direct communication between devices within the network coverage by the eNodeB 103. In the other scenario 100B shown on the right side of FIG. 1, the two wireless devices 104 and 105 perform direct communication between the devices outside the network coverage.

  In Release 12, with respect to D2D communications, the focus is mainly on scenarios outside the network coverage and broadcast traffic.

  One consideration in scenarios outside network coverage is the structure of D2D communication. Currently, there are basically two candidates for the structure of D2D communication: 1) a centralized structure as shown in FIG. 2 (A) and 2) a distributed structure as shown in FIG. 2 (B). Exists.

  2A and 2B are schematic diagrams showing a centralized structure and a distributed structure in D2D communication.

  In FIG. 2A, a solid line represents a data signal, and a dotted line represents a control signal. As can be seen from the figure, in a centralized scenario, there are two types of wireless devices (also referred to as user equipment (UE)): a cluster head (or master UE) 201 and slave UEs 202A-202D. In such a scenario, signaling is controlled by the cluster head, but data can be sent directly from one slave UE to another slave UE.

  Similarly in FIG. 2B, the solid line represents the data signal, and the dotted line represents the control signal. As can be seen from the figure, in a distributed scenario, the cluster head (or master UE) and slave UE are not defined. All user equipments 203A to 203E are equivalent. Both the control signal and the data are transmitted from the transmitting UE to the receiving UE.

  Another consideration regarding D2D communication is the problem of power control. Currently, there is no power control based on the understanding of most companies. Therefore, transmission at maximum power is basically assumed. For this reason, power consumption increases and interference with other UEs also occurs.

  FIG. 3 is a schematic diagram illustrating a problem caused by transmitting at maximum power. As shown in FIG. 3, it is desirable that the transmission side UE 301 performs data transmission and signaling to the reception side user equipments 302A to 302C in the cluster to which the transmission side UE 301 belongs. Therefore, the communication range at the optimum transmission power is indicated by a dotted ellipse in FIG. However, the communication range at the maximum transmission power is indicated by a solid oval in FIG. Therefore, when transmission is performed with the maximum power, not only the power consumption of the transmission-side UE 301 is increased, but also large interference with the UEs 303A and 303B that are not transmission targets occurs.

  The present disclosure has been made in consideration of the above situation.

  According to the first aspect of the present disclosure, the process of receiving power control information including the reference signal transmission power of the second wireless device from the second wireless device, and the second wireless device is the first wireless device And a device capable of communicating with a third wireless device, wherein a transmission path loss between the first wireless device and the second wireless device is expressed as a reference signal transmission power of the second wireless device and the third wireless device. Based on the processing to calculate using the reference signal received power (RSRP) measured in the first wireless device and the transmission path loss between the first wireless device and the second wireless device, the first And an integrated circuit for controlling a process for determining transmission power of a first data channel for direct communication between one wireless device and the third wireless device.

  According to an integrated circuit of some aspects of the present disclosure, power consumption of a wireless device and interference with a wireless device that is not a transmission target can be reduced in various scenarios of D2D communication.

  The above is a summary of the present disclosure, and, of course, details have been simplified, generalized, and omitted. Other aspects, features, and advantages of the apparatus, processes, and other subject matter of the present invention will become apparent from the teachings described herein. The above summary is intended to briefly introduce important concepts of the present disclosure, which are further described in the Detailed Description section. The above summary is not intended to identify key features or essential features of the claimed subject matter, but to determine the scope of the claimed subject matter. Also not used in.

  Hereinafter, embodiments of the present disclosure will be described in detail in combination with the accompanying drawings. The above and other aspects and advantages of the present disclosure will become more apparent and readily understood in the following description.

Schematic showing two scenarios of D2D communication (A) is a schematic diagram showing a centralized structure in D2D communication, and (B) is a schematic diagram showing a distributed structure. Schematic showing the problems caused by transmitting at maximum power in D2D communication FIG. 5 is a flowchart illustrating a power control method by a wireless device according to an embodiment of the present disclosure. Flow diagram illustrating a power control method by a wireless device, according to another embodiment of the present disclosure 1 is a block diagram showing a schematic configuration of a wireless device according to an embodiment of the present disclosure FIG. 6 is a block diagram illustrating a schematic configuration of a wireless device according to another embodiment of the present disclosure. Schematic showing a scenario of D2D communication according to the first embodiment of the present disclosure Schematic which shows the basic principle applied to the scenario of D2D communication of 1st Embodiment Schematic illustrating a scenario of D2D communication according to a second embodiment of the present disclosure Schematic showing a scenario of D2D communication according to the third embodiment of the present disclosure

  In the following detailed description, reference is made to the accompanying drawings, which form a part hereof. In the drawings, similar symbols typically represent similar elements, unless context dictates otherwise. The aspects of the present disclosure can be arranged, replaced, combined, and designed in various different structures and configurations, and all such aspects are expressly intended and form part of the present disclosure. It will be easily understood.

  FIG. 4 is a flowchart illustrating a power control method by a radio apparatus (user equipment, UE) according to an embodiment of the present disclosure. This UE and at least one other UE can form a cluster, and this UE uses a sufficiently large transmit power to deliver data to all UEs in the cluster and Direct communication can be performed. In the following description, for the purpose of distinction, this wireless device is referred to as a first wireless device, and the other wireless device is referred to as a second wireless device.

  As shown in FIG. 4, in this embodiment of the present disclosure, on the first wireless device side, first, in step 401, power control information including the second data channel transmission power is received from the second wireless device. Is done. The second data channel transmission power is power that allows the second wireless device to deliver data to all wireless devices in the cluster. That is, if the second data channel transmission power is high enough to allow the second wireless device to communicate with all wireless devices including the first wireless device in the cluster, the second data channel transmission power is May not be the maximum transmission power of the wireless device.

  Thereafter, in step 402, the first data channel transmission power is determined based on the second data channel transmission power. This first data channel transmission power is the power that the first wireless device can reach to all the wireless devices in the cluster, similar to the second data channel transmission power. That is, if the first data channel transmission power is high enough to allow the first wireless device to communicate with all wireless devices including the second wireless device in the cluster, the first data channel transmission power is May not be the maximum transmission power of the wireless device. The process of determining the first data channel transmission power will be described in detail later in combination with some embodiments.

  Thereafter, after determining the first data channel transmission power, in step 403, the data channel transmission power of the first radio apparatus is controlled according to the first data channel transmission power. For example, the data channel transmission power of the first wireless device can be controlled to the same value as the first data channel transmission power.

  FIG. 5 is a flow diagram illustrating a power control method executed by the second wireless device. As shown in FIG. 5, in this embodiment, the second data channel transmission power is first acquired in step 501 on the second radio apparatus side. The process of obtaining the second data channel transmission power will be described in detail later in combination with some embodiments.

  Thereafter, in step 502, power control information including second data channel transmission power is transmitted to the first wireless device. As described above, this power control information is used to determine the first data channel transmission power, and the data channel transmission power of the first wireless device is controlled according to this first data channel transmission power. . The meanings of the first data channel transmission power and the second data channel transmission power have been described above and will not be described in detail here.

  That is, in the above-described embodiment of the present disclosure, a power control method is provided as follows in a cluster including the first wireless device and the second wireless device. First, the second data channel transmission power is acquired by the second wireless device. Thereafter, power control information including the second data channel transmission power is transmitted to the first radio apparatus by the second radio apparatus. Accordingly, the first wireless device receives power control information from the second wireless device. A first data channel transmission power is then determined by the first wireless device based on the second data channel transmission power. Finally, the first radio apparatus controls its own data channel transmission power according to the first data channel transmission power.

  FIG. 6 is a block diagram illustrating a schematic configuration of a wireless device 600 according to an embodiment of the present disclosure. As shown in FIG. 6, a radio apparatus 600 as a first radio apparatus includes a receiver 601 that receives power control information including a second data channel transmission power from the second radio apparatus, and a second data channel transmission. A determination unit 602 that determines a first data channel transmission power based on the power, and a controller 603 that controls the data channel transmission power of the first wireless device according to the first data channel transmission power.

  As in the case of the power control method described with reference to FIGS. 4 and 5, the first data channel transmission power is the power that the first wireless device can reach to all the wireless devices in the cluster. The second data channel transmission power is the power that the second wireless device can reach to all the wireless devices in the cluster.

  The radio apparatus 600 according to this embodiment optionally includes the following elements: a CPU (Central Processing Unit) that executes various programs in the radio apparatus 600 and executes related programs for controlling the operation of each unit. 610, a ROM (Read Only Memory) 613 for storing various programs necessary for executing various processes and controls by the CPU 610, and a RAM for storing intermediate data temporarily created in the process and control procedures by the CPU 610 (Random Access Memory) 615 and / or a storage unit 617 for storing various programs, data, and the like. The receiver 601, the determination unit 602, the controller 603, the CPU 610, the ROM 613, the RAM 615, and / or the storage unit 617 are connected to each other via the data and / or the command bus 620, and send signals between each other. Can be transmitted.

  Each unit described above does not limit the scope of the present disclosure. According to an embodiment of the present disclosure, the functions of the receiver 601, the determination unit 602, and the controller 603 can be implemented by hardware, and the CPU 610, ROM 613, RAM 615, and / or storage unit 617 can be It may not be necessary. Alternatively, the functions of the receiver 601, the determination unit 602, and the controller 603 can be implemented by function software in combination with the CPU 610, ROM 613, RAM 615, and / or storage unit 617. .

  FIG. 7 is a block diagram illustrating a schematic configuration of a wireless device 700 according to an embodiment of the present disclosure. As illustrated in FIG. 7, a wireless device 700 as a second wireless device receives an acquisition unit 701 that acquires second data channel transmission power and power control information including the second data channel transmission power in the first And a transmitter 702 for transmitting to the wireless device. The data channel transmission power of the first wireless device is controlled according to the first data channel transmission power determined based on the second data channel transmission power.

  As in the case of the power control method described with reference to FIGS. 4 and 5, the first data channel transmission power is the power that the first wireless device can reach to all the wireless devices in the cluster. The second data channel transmission power is the power that the second wireless device can reach to all the wireless devices in the cluster.

  The wireless device 700 according to this embodiment optionally includes the following elements: a CPU (Central Processing Unit) that executes various programs in the wireless device 700 and executes related programs for controlling the operation of each unit. 710, a ROM (Read Only Memory) 713 for storing various programs necessary for executing various processes and controls by the CPU 710, and a RAM for storing intermediate data temporarily created in the process and control procedures by the CPU 710 (Random Access Memory) 715 and / or a storage unit 717 that stores various programs, data, and the like. The acquisition unit 701, the transmitter 702, the CPU 710, the ROM 713, the RAM 715, the storage unit 717, and the like can be connected to each other via the data and / or command bus 720 to transmit signals between each other.

Each unit described above does not limit the scope of the present disclosure. According to one embodiment of the present disclosure, the functions of the acquisition unit 701 and transmitter 702 described above can be implemented by hardware, and the CPU 710, ROM 713, RAM 715, and / or storage unit 717 described above may not be necessary. is there. Alternatively, the functions of the acquisition unit 701 and the transmitter 702 can be implemented by function software in combination with the CPU 710, the ROM 713, the RAM 715, and / or the storage unit 717.
In the power control method shown in FIGS. 4 and 5 and the radio apparatus shown in FIGS. 6 and 7, as described above, the data channel transmission power of the first radio apparatus is set to the data of the second radio apparatus. It can be determined based on the channel transmission power. Hereinafter, the power control method will be described in detail in combination with some embodiments.

First Embodiment In the first embodiment, the data channel transmission power of the first wireless device is not only based on the transmission power of the second wireless device, but also the first wireless device and the second wireless device. It is also determined based on the transmission path loss between

  FIG. 8 is a schematic diagram illustrating a scenario of D2D communication according to the first embodiment of the present disclosure. As shown in FIG. 8, UEs 801 to 803 form a centralized UE cluster 800. In this case, UE 801 functions as a cluster head (CH), and UEs 802 and 803 function as slave UEs. Assume now that UE2 803 is the transmitting UE and UE1 802 is the receiving UE. UE2 803 corresponds to the first radio apparatus described above with reference to FIGS. 4 to 7, and CH801 corresponds to the second radio apparatus described above with reference to FIGS.

  FIG. 9 is a schematic diagram showing a basic principle applied to the D2D communication scenario of the first embodiment shown in FIG. As shown in FIG. 9, the arrow with symbol A represents the power used to compensate for the path loss between UE2 and CH. The arrow with symbol B represents the CH data channel transmission power. The arrow with the symbol C represents the power required for the transmitting side UE2 to transmit a data signal to the receiving side UE1. In this case, the sum of A and B is always greater than or equal to C, regardless of the position of CH. In other words, no matter where the CH is located, the sum of A and B can always meet the transmission requirements of UE2. In most cases, the power value based on the sum of A and B is greater than the actual required transmission power.

  Based on this principle, the data channel transmission power of the transmitting side UE2 can be determined based on the data channel transmission power of the cluster head and the transmission path loss between the UE2 and the cluster head.

  Specifically, the data channel transmission power of the transmission side UE 2 can be derived from the following equation (1).

  P_slave = P_pathloss + P_CH (1)

  In this equation, P_slave is the data channel transmission power of the slave UE (that is, the first radio apparatus described above with reference to FIGS. 4 to 7). P_CH is the data channel transmission power of CH (that is, the second radio apparatus described above with reference to FIGS. 4 to 7). P_pathloss is a transmission path loss between the first wireless device and the second wireless device.

  In addition, margin power values can be introduced to compensate for channel fading. That is, the data channel transmission power of the transmission side UE 2 can be derived from the following equation (2).

  P_slave = P_pathloss + P_CH + P_margin (2)

  In this equation, the meanings of P_slave, P_CH, and P_pathloss are the same as the meanings of these parameters in equation (1), and P_margin is a margin power value for compensating for channel fading (for example, fast fading). . The method for determining the marginal power value is known to those skilled in the art and will not be described in detail here.

  In the above formulas (1) and (2), the transmission path loss can be obtained from the transmission power and reception power of the reference signal as follows.

P_pathloss = P_CH _RS- RSRP (3)

In this equation, P_CH _RS is the reference signal transmission power of CH, and RSRP is the reference signal reception power measured in the slave UE2.

The above equation (3) can be substituted into the above equation (1) or equation (2). In particular, the CH reference signal transmission power P_CH _RS may be the same value or a different value from the CH data channel transmission power P_CH. For example, when P_CH _RS and P_CH are the same, the above equation (2) can be further expressed as follows.

P_slave = P_pathloss + P_CH + P_margin
= P_CH-RSRP + P_CH + P_margin
= 2 × P_CH−RSRP + P_margin (4)

  In the first embodiment of the present disclosure, the second data channel transmission power may be included in the power control information and signaled to the first radio device by the second radio device. On the other hand, the transmission path loss between the first wireless device and the second wireless device is caused by the reference signal reception power measured by the first wireless device and the reference signal transmission power of the second wireless device ( In general, it may be the same as the second data channel transmission power signaled to the first wireless device). Thereby, the first radio apparatus can determine its own data channel transmission power based on the above equation.

  By using the first embodiment of the present disclosure, accurate power control regardless of the position of the second wireless device (CH) enables high power consumption of the first wireless device and wireless devices that are not transmission targets. Can be avoided.

Second Embodiment In the second embodiment of the present disclosure, when it is determined that the second wireless device is located at the periphery of the cluster, the first data channel transmission power is the second It is determined based only on the data channel transmission power.

  FIG. 10 is a schematic diagram illustrating a scenario of D2D communication according to the second embodiment of the present disclosure. As shown in FIG. 10, UEs 1001 to 1003 form a centralized UE cluster 1000. In this case, UE 1001 functions as a cluster head (CH), and UEs 1002 and 1003 function as slave UEs. Assume now that UE1 1002 is the transmitting UE and UE2 1003 is the receiving UE. UE1 1002 corresponds to the first radio apparatus described above with reference to FIGS. 4 to 7, and CH1001 corresponds to the second radio apparatus described above with reference to FIGS.

  In FIG. 10, the position of CH1001 is known and is located at the periphery of the cluster. The data channel transmission power of the CH can compensate for the path loss of the farthest UE, and the data channel transmission power of the slave UE used to correct the path loss to other UEs is the data channel transmission of the cluster head Since the power is not exceeded, UE1 1002 can transmit data to the farthest UE2 1003 by using the same power as the CH data channel transmission power. That is, in this embodiment, the first data channel transmission power can be the same as the second data channel transmission power.

  Furthermore, in the same manner as in the first embodiment, considering the fading of the channel, a margin power value can be included, and the first data channel transmission power can be derived as follows.

  P_slave = P_CH + P_margin (5)

  The meaning of the parameter in equation (5) is the same as the parameter described in the first embodiment, and will not be described in detail here.

  Therefore, in this embodiment, the important thing is to recognize the position of CH. In an actual implementation, there are many methods for recognizing the position of the CH. For example, the position of CH can be determined from a positioning system, a positioning channel, or a positioning signal. In another example, the location of CH can be determined from precoding characteristics. In a further example, the position of the CH can be determined from the beamformed received signal on the CH. Detailed processes for recognizing the position of CH are known to those skilled in the art and will not be described in detail here.

  By using the second embodiment of the present disclosure, as in the first embodiment, it is possible to avoid large power consumption of the first wireless device and interference with a wireless device that is not a transmission target. . Further, as apparent when comparing the expression (5) of the second embodiment with the expression (2) of the first embodiment, the term of P_pathloss is deleted. Therefore, the data channel transmission power of the first wireless device can be further reduced by using the position information of the second wireless device.

Third Embodiment In the first embodiment or the second embodiment, the data channel transmission power of the first wireless device is relatively constant after being determined. However, when the position of the second wireless device changes, the data channel transmission power of the first wireless device may be changed accordingly.

  Specifically, in the third embodiment, the first data channel transmission power is not only the second data channel transmission power, but also the transmission path between the first wireless device and the second wireless device. Either the power determined based on the loss or the power based only on the second data channel transmission power can be employed depending on the position of the second wireless device.

  FIG. 11 is a schematic diagram illustrating a scenario of D2D communication according to the third embodiment of the present disclosure. As shown in FIG. 11, UEs 1101 to 1103 form a centralized UE 1100. In this case, UE 1101 functions as a cluster head (CH), and UEs 1102 and 1103 function as slave UEs. Assume now that UE1 1102 is the transmitting UE and UE2 1103 is the receiving UE. UE1 1102 corresponds to the first radio apparatus described above with reference to FIGS. 4 to 7, and CH1101 corresponds to the second radio apparatus described above with reference to FIGS.

  If CH1101 is at position 1 (ie, at the periphery of the cluster), the power control method according to the second embodiment can be used. That is, the data channel transmission power of UE1 1102 is determined based only on the data channel transmission power of CH1101. If CH 1101 has moved to position 2 (ie, not to the periphery of the cluster), the power control method according to the first embodiment may be used. That is, the data channel transmission power of UE1 1102 is determined based on the data channel transmission power of CH1101 and the transmission path loss between CH1101 and UE1 1102.

  Information regarding which power control method to use may be conveyed by higher layer signaling or first layer signaling.

  Similarly, in the third embodiment of the present disclosure, it is possible to avoid large power consumption of the first wireless device and interference with a wireless device that is not a transmission target. Furthermore, it is possible to use an optimal power control scheme corresponding to different scenarios (for example, different positions of the second wireless device).

Fourth Embodiment In the first to third embodiments, the method for controlling the data channel transmission power of the first radio apparatus (for example, the slave UE) has been described. In the following fourth embodiment, a power control method for a second radio apparatus (for example, CH) will be described.

  Assuming the same scenario as in FIG. 8, the data channel transmit power of the second wireless device may be determined from the reference signal.

  Specifically, the data channel transmission power of the second wireless device can be determined on the first wireless device side or the second wireless device side. For example, the data channel transmission power of the second wireless device includes the reference signal reception power measured in the first wireless device, the reference signal transmission power of the second wireless device, and the cluster on the first wireless device side. And the minimum signal reception power common to all of the wireless devices.

  That is, as shown in FIG. 8, the data channel transmission power of CH 801 can be determined from the following equation (6).

P_CH = P_CH _RS- RSRP + P_threshold (6)

In this equation, P_threshold is the minimum signal reception power common to all wireless devices in the cluster, and the meaning of P_CH, P_CH _RS , and RSRP is the same as the meaning of these parameters in the equations shown so far. Yes, not described in detail here.

  It should be noted that the above description is for two slave UEs. However, the above description also applies to more than two slave UEs. Specifically, assuming that the cluster now includes a plurality of wireless devices including a first wireless device, a second wireless device, and a third wireless device, the second data channel transmission power Is the smaller of the reference signal received power measured at the first wireless device and the reference signal received power measured at the third wireless device, the reference signal transmitted power of the second wireless device, It can be determined from the minimum signal reception power common to all wireless devices in the cluster, which can be expressed by the following equation (7).

P_CH = P_CH _RS− min (RSRP_ue ₁ , RSRP_ue ₂ , RSRP_ue ₃ ,..., RSRP_ue _n ) + P_threshold (7)

In this equation, min (RSRP_ue ₁ , RSRP_ue ₂ , RSRP_ue ₃ ,..., RSRP_ue _n ) is the minimum value of the reference signal received power measured in all (n) slave UEs in the cluster. Yes, the meanings of P_CH, P_CH _RS , and P_threshold are the same as the expressions shown so far, and will not be described in detail here.

  Furthermore, it should be noted that the above description is for the case where the second data channel transmission power is determined at the first wireless device side. However, as described above, the second data channel transmission power can also be determined on the second wireless device side. That is, the second data channel transmission power is the minimum signal that is common to all the wireless devices in the cluster, the reference signal reception power measured in the second wireless device, the reference signal transmission power of the first wireless device, and It can be determined from the received power.

  Similar to the above example, when the cluster includes a plurality of wireless devices including a first wireless device, a second wireless device, and a third wireless device, the second data channel transmission power is The smaller one of the reference signal received power measured at the second wireless device and the reference signal received power measured at the third wireless device, the reference signal transmitted power of the first wireless device, It can be determined from the minimum signal reception power common to all wireless devices.

  The detailed process for determining the second data channel transmission power is similar to the process in the above example and will not be described in detail here.

Furthermore, it should be noted that the above description is for a centralized D2D communication scenario. However, the above description also applies to distributed D2D communication scenarios. In that case, P_CH in the above equation (7) means the data channel transmission power of the target UE (for example, the transmission side user equipment), P_CH _RS means the reference signal transmission power of the target UE, and min ( RSRP_ue ₁ , RSRP_ue ₂ , RSRP_ue ₃ ,..., RSRP_ue _n ) are the reference signal received power measured at all other (n) UEs (eg, all receiving UEs) in the cluster. Means the minimum value.

  Using this fourth embodiment of the present disclosure, the transmit power of the transmitting radio device can be optimized based on the coverage of the receiving UE, so that the transmitting radio device can: The maximum transmission power is not necessarily used, and the power consumption of the wireless device on the transmission side can be reduced.

Fifth Embodiment In the four embodiments so far, the power control method for the data channel has been described. However, the power control method of the present disclosure can also be applied to the control channel as in the fifth embodiment below.

  Specifically, in one example, the transmission power of the control channel of the wireless device can be determined from the transmission power of the data channel and the offset value, as in Equation (8) below.

  P_control = P_data + P_offset (8)

  In this equation, P_control is the control channel transmission power of the wireless device, P_data is the data channel transmission power of the same wireless device that can be determined according to any of the above embodiments, and P_offset is the control channel The offset or compensation coefficient used in the above-described case may be specified or set by higher layer signaling such as RRC signaling.

  Therefore, in this example, the power of another channel such as a control channel does not need to be a fixed value or a maximum value, and as described in the above embodiment, according to the situation, as in the case of the data channel. Can be optimized.

  In another example, control channel power control may be independent of data channel power control in order to ensure robustness of the control channel. For example, the control channel can always be set using the maximum power value regardless of the status of the data channel.

In the above first to fifth embodiments, the power control information transmitted from the second wireless device to the first wireless device is the data channel transmission power of the second wireless device (that is, the second The first wireless device determines its own data channel transmission power (ie, the first data channel transmission power) based on the second data channel transmission power.

  However, this determination process may also be performed by the second wireless device, and only the determination result is transmitted to the first wireless device.

  That is, in this case, the second radio apparatus acquires its second data channel transmission power. The second wireless device then determines a first data channel transmission power based on the second data channel transmission power using a power control method according to any of the above embodiments. Next, the second radio apparatus inserts the determination result (that is, the first data channel transmission power) into the power control information, and transmits the power control information to the first radio apparatus. Correspondingly, the first radio apparatus receives power control information indicating the first data channel transmission power, and controls its own data channel transmission power according to the first data channel transmission power. For example, the first radio apparatus controls its own data channel transmission power to the same value as the first data channel transmission power.

  In the modified example of the present disclosure, the processing load on the first wireless device can be reduced.

  The previous embodiments of the present disclosure are merely exemplary descriptions, and the specific structure and operation of the embodiments do not limit the scope of the present disclosure. Those skilled in the art can devise different embodiments and combinations of different operations for each of the above embodiments to create new embodiments that also fit the ideas of the present disclosure.

  Embodiments of the present disclosure can be implemented by hardware, software, firmware, or a combination thereof, and the implementation method does not limit the scope of the present disclosure.

  Connection relationships between respective functional elements (units) in the embodiments of the present disclosure do not limit the scope of the present disclosure, in which one or more functional elements or functional units may be A functional element can be included, or a functional element can be connected to any other functional element.

  So far, several embodiments of the present disclosure have been illustrated and described in conjunction with the accompanying drawings, but are still within the scope of the claims of the present disclosure and their equivalents, and variations of the above embodiments and Those skilled in the art will appreciate that modifications can be made without departing from the principles and concepts of the present disclosure.

Claims (3)

Processing for receiving power control information including reference signal transmission power of the second wireless device from the second wireless device, and the second wireless device can communicate with the first wireless device and the third wireless device A device,
The transmission path loss between the first radio apparatus and the second radio apparatus is expressed as a reference signal transmission power of the second radio apparatus and a reference signal reception power (RSRP) measured by the first radio apparatus. ) To calculate using
A first data channel for direct communication between the first wireless device and the third wireless device based on a transmission path loss between the first wireless device and the second wireless device; Controlling the process of determining the transmission power,
Integrated circuit. The power control of the first data channel is controlled independently of the power control of the control channel;
The integrated circuit according to claim 1. The transmission power of the first data channel is determined without being based on the location of the first wireless device;
The integrated circuit according to claim 1.

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