CN111246558A - Power control method, device, terminal and readable storage medium - Google Patents

Power control method, device, terminal and readable storage medium Download PDF

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Publication number
CN111246558A
CN111246558A CN201910093956.3A CN201910093956A CN111246558A CN 111246558 A CN111246558 A CN 111246558A CN 201910093956 A CN201910093956 A CN 201910093956A CN 111246558 A CN111246558 A CN 111246558A
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terminal
information
power control
power
control target
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CN201910093956.3A
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CN111246558B (en
Inventor
姜炜
纪子超
彭淑燕
刘是枭
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Vivo Mobile Communication Co Ltd
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Vivo Mobile Communication Co Ltd
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Priority to CN201910093956.3A priority Critical patent/CN111246558B/en
Priority to PCT/CN2020/070904 priority patent/WO2020156070A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/241—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/22—TPC being performed according to specific parameters taking into account previous information or commands
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/22—TPC being performed according to specific parameters taking into account previous information or commands
    • H04W52/228—TPC being performed according to specific parameters taking into account previous information or commands using past power values or information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/10—Open loop power control

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The embodiment of the invention discloses a power control method, a device, a terminal and a readable storage medium, wherein the power control method comprises the following steps: in side link communication, a second terminal receives power control request information from a first terminal, wherein the first terminal is an information receiving terminal in the side link communication; the second terminal determines the transmission power of the second terminal based on the first information; wherein the first information is obtained by the second terminal from the outside or measured by the second terminal. The embodiment of the invention can realize the power control of the target terminal in the sidelink communication.

Description

Power control method, device, terminal and readable storage medium
Technical Field
The present invention relates to the field of communications, and in particular, to a power control method, apparatus, terminal, and readable storage medium.
Background
Generally, Sidelink (Sidelink) refers to a technique for realizing direct communication between multiple terminals (UEs) without passing through a network; vehicle to electric (V2X) technology is a key wireless communication and information processing technology in intelligent transportation systems.
Currently, the open-loop power control method of the sildelink generally uses the path loss between the terminal and the base station to realize centralized control of the terminal transmission power in the sildelink network, and for an originating UE having a plurality of receiving UEs in the sildelink communication, the originating UE only has one power control process. This way of working is not reasonable because: in the original LTE V2X, only broadcast services are available, and the path loss between the UE and the base station is used for open-loop power control within the coverage of the base station, and the maximum transmission power is used for transmission outside the coverage of the base station. However, in the new air interface NRV2X, there are unicast, multicast and broadcast services, and in the coverage area of the base station, it is not reasonable to perform power control on the unicast service according to the path loss between the terminal and the base station, and in the scenario outside the coverage area of the base station, the current power control mechanism cannot meet the higher requirement of the overall performance of the system for the unicast service, even for the multicast service.
Disclosure of Invention
The embodiment of the invention provides a power control method, a power control device, a terminal and a readable storage medium, which are used for solving the problem that the power control effect of the terminal in the current bypass link communication is poor.
In order to solve the technical problem, the invention is realized as follows:
in a first aspect, an embodiment of the present invention provides a power control method, which is applied to a terminal, and the method includes: in side link communication, a second terminal receives power control request information from a first terminal, wherein the first terminal is an information receiving terminal in the side link communication; the second terminal determines the transmission power of the second terminal based on the first information; wherein the first information is obtained by the second terminal from the outside or measured by the second terminal.
In a second aspect, an embodiment of the present invention further provides a power control method, which is applied to a terminal, and the method includes: in the side link communication, the first terminal determines the type of the power control target terminal based on the second information; the first terminal is an information receiving terminal in the sidelink communication, and the second information is obtained by the first terminal from the outside or is obtained by the first terminal through measurement.
In a third aspect, an embodiment of the present invention further provides a power control apparatus, which is applied to a terminal, and includes: an information receiving module, configured to receive power control request information from a first terminal in sidelink communication, where the first terminal is an information receiving terminal in the sidelink communication; a transmission power determination module, configured to determine a transmission power of the second terminal based on the first information; wherein the first information is obtained by the second terminal from the outside or measured by the second terminal.
In a fourth aspect, an embodiment of the present invention further provides a power control apparatus, which is applied to a terminal, and includes: the type determining module is used for determining the type of the power control target terminal based on the second information in the side link communication; the type determining module is located in an information receiving terminal in the sidelink communication, and the second information is obtained by the first terminal from the outside or is obtained by the first terminal through measurement.
In a fifth aspect, an embodiment of the present invention further provides a terminal, where the terminal includes a processor, a memory, and a computer program stored in the memory and being executable on the processor, and when the computer program is executed by the processor, the steps of the power control method described above are implemented.
In a sixth aspect, the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the power control method as described above.
The embodiment of the invention can determine the type of the power control target terminal in the side link communication, and the power control target terminal can adjust the self transmitting power to achieve the purpose of power control. The embodiment of the invention can realize the transmission power control of the terminal in the side link communication. Compared with the conventional power control mechanism, the power control scheme of the invention can reduce power waste, reduce interference and improve the overall performance of the system to a certain extent.
Drawings
The present invention will be better understood from the following description of specific embodiments thereof taken in conjunction with the accompanying drawings, in which like or similar reference characters designate like or similar features.
Fig. 1 is a flow chart of a power control method according to an embodiment of the invention.
Fig. 2 is a schematic diagram of an application scenario effect according to an embodiment of the present invention.
Fig. 3 is a block diagram of a power control apparatus according to an embodiment of the invention.
Fig. 4 is a schematic diagram of a hardware structure of a terminal for implementing an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a power control method, which is applied to terminal equipment and comprises the following steps:
in the side link communication, a first terminal determines the type of a power control target terminal based on second information, wherein the first terminal is an information receiving terminal in the side link communication, and the second information is obtained by the first terminal from the outside or is measured by the first terminal.
The embodiment of the invention can determine the type of the power control target terminal in the sidelink communication and assist in realizing the determination of the power control target terminal.
Fig. 1 shows a flow chart of a power control method according to another embodiment of the present invention, which is applied to a terminal device, and the method includes:
s101, in side link communication, a second terminal receives power control request information from a first terminal, wherein the first terminal is an information receiving terminal in the side link communication;
s102, the second terminal determines the transmitting power of the second terminal based on the first information; wherein the first information is obtained by the second terminal from the outside or measured by the second terminal.
In the embodiment of the present invention, the second terminal is a power control target terminal, which may be an interfering terminal in the sidelink communication or an information sending terminal in the sidelink communication. By utilizing the embodiment of the invention, the power control target terminal can adjust the self transmitting power, thereby realizing the purpose of power control of the target terminal.
Fig. 2 is a schematic diagram illustrating an application scenario in which multiple peer-to-peer communication links perform Sidelink communication simultaneously according to an embodiment of the present invention. In particular, the first transmitting terminal TX1 in fig. 2 transmits data to the first receiving terminal RX1, and the second transmitting terminal TX2 transmits data to the second receiving terminal RX 2.
For convenience of description, it is assumed that during communication, TX1 may cause interference to RX2, and TX2 may cause interference to RX 1; then according to the embodiment of the present invention, if the communication quality of the link TX2 to RX2 is poor, RX2 may determine that the reason for the poor communication quality of the link is that the interference caused by TX1 is large based on externally obtained information or based on measurement information of RX2, and then the energy of TX1 to RX2 is larger than that of TX2 to RX 2.
Based on this, RX2 may determine that TX1 is a power control target terminal, then RX2 transmits power control request information to TX 1. Upon receiving the power control request message, TX1 may adjust the transmit power of TX1, e.g., decrease (or increase) the transmit power, based on externally obtained information or based on the measurement information of TX 1.
The implementation of the power control method will be described in detail in the following from various aspects of embodiments of the present invention.
For convenience of description, hereinafter, "power control" is abbreviated as "power control", a "transmitting terminal" is abbreviated as "originating UE", a "receiving terminal" is abbreviated as "receiving UE", and an "interfering terminal" is abbreviated as "interfering UE".
Technical terms and corresponding abbreviations that may be involved in the embodiments of the present invention are:
physical sidelink control channel: physical sidelink control channel, PSCCH;
physical sidelink data channel: physical sidelink share channel, PSSCH;
physical sidelink feedback channel: physical sidelink feedback channel, PSFCH;
reference signal received power: reference signal receiving power, RSRP;
side link control information: sidelink Control Information, SCI;
side link feedback control information: sildelink feedback control information, SFCI;
signal to interference plus noise ratio: signal to Interference plus Noise Ratio, SINR;
block error rate: block Error Ratio, BLER;
channel quality indication: channel Quality Indicator, CQI;
reference signal reception quality: reference Signal Receiving Quality, RSRQ;
received Signal Strength Indication, RSSI;
hybrid automatic repeat request: hybrid Automatic Repeat reQuest, HARQ;
quality of service: quality of Service, QoS.
< determining the type of the power control target UE >
According to the embodiment of the present invention, the receiving UE may determine the type of the power control target UE based on information X, where the information X may be obtained by the receiving UE from the outside or measured by the receiving UE.
Specifically, with respect to the information X, it may include at least one of the following various information: historical measurement information, channel measurement information, interference measurement information, solution control information, auxiliary information of other terminals in sidelink communication, and data packet statistical result information in a sensing window (sensing window).
More specifically, the information X may include at least one of the following information: receiving end signal to interference plus noise ratio SINR, block error rate BLER, channel quality indicator CQI, reference signal received power RSRP, reference signal received quality RSRQ, received signal strength indicator RSSI, path loss (pathloss), geographical location information, number of interference sources, transmission type being unicast, transmission type being multicast, transmission type being broadcast, quality of service QoS requirement, and channel occupancy.
In the embodiment of the present invention, the type of the power control target UE may be an originating UE or an interfering UE, and may be determined through the information X, where the determination process is illustrated below.
In one embodiment of the present invention, if the information X includes a receiver SINR, the receiver SINR is compared with a first threshold value to determine a type of the power control target UE in the sidelink communication, wherein,
optionally, if the SINR of the receiving end is greater than the first threshold, determining that the type of the power control target UE is the transmitting end;
alternatively, if the SINR of the receiving end is less than or equal to the first threshold and the transmission power of the originating UE is good enough (e.g., compared with the second threshold), the determination is performed as follows:
optionally, if the SINR of the receiving end is less than or equal to the first threshold and the transmission power of the originating UE is greater than or equal to the second threshold, determining that the type of the power control target UE is an interfering UE;
optionally, if the SINR of the receiving end is less than or equal to the first threshold and the transmission power of the originating UE is less than the second threshold, determining that the type of the power control target UE is the originating UE.
In one embodiment of the present invention, if the information X includes a BLER, the BLER is compared with a third threshold value to determine a type of a power control target UE in the sidelink communication, wherein,
optionally, if the BLER is less than the third threshold, determining the type of the power control target UE as the originating UE;
alternatively, if the BLER is less than the third threshold and the transmission power of the originating UE is good enough (e.g., compared to the fourth threshold), then it is determined as follows:
optionally, if the BLER is greater than or equal to the third threshold and the transmission power of the originating UE is greater than or equal to the fourth threshold, determining that the type of the power control target UE is an interfering UE;
and if the BLER is greater than or equal to a third threshold value and the transmitting power of the originating UE is less than a fourth threshold value, determining the type of the power control target UE as the originating UE.
< Power control target UE is interfering UE >
The type of the power control target UE can be determined based on the above embodiments of the present invention. If it is determined that the power control target UE type is an interfering UE, in this case, the receiving UE may determine the power control target UE among the one or more interfering UEs based on the measurement result. The measurement results described herein may include the aforementioned information X.
The number of the power control target UEs in the embodiment of the present invention may be one or multiple, and the following illustrates a process of determining the power control target UE in one or multiple interfering UEs.
In an embodiment of the present invention, if the measurement result includes RSRP of at least one interfering link, the RSRP of the at least one interfering link is compared with a fifth threshold value to determine a power control target UE, wherein,
optionally, if the RSRP of the first interfering link is greater than a fifth threshold, determining the interfering UE corresponding to the first interfering link as a power control target UE;
optionally, if RSRPs of multiple interfering links in the at least one interfering link are all greater than a fifth threshold, all of multiple interfering UEs corresponding to the multiple interfering links are taken as power control target UEs;
optionally, if the RSRPs of the multiple interfering links are all greater than the fifth threshold, determining an interfering link with the maximum RSRP among the multiple interfering links, and using an interfering UE corresponding to the interfering link with the maximum RSRP as a power control target UE.
The fifth threshold value may be RSRP of the signal link or a sum of RSRP of the signal link and a compensation value (e.g., -8 dB).
In an embodiment of the present invention, if the measurement result includes pathloss of at least one link, the pathloss of the at least one link is compared with a sixth threshold value to determine a power control target UE, wherein,
optionally, if the pathloss of the second link is smaller than the sixth threshold, the interfering UE corresponding to the second link is determined as the power control target UE.
The sixth threshold may be pathloss of the signal link or a sum of pathloss and a preset offset value (e.g., -8 dB).
< Power control request information >
After the power control target UE is determined, the receiving end UE sends power control request information to the power control target UE, and the power control request information is used for requesting the power control target UE to adjust the transmitting power.
In detail, taking the power control target UE as the interfering UE as an example, the receiving UE requests the interfering UE to perform power adjustment, and the receiving UE can send power control request information to the power control target UE at the next transmittable time.
Here, the next transmission time may be psch, PSCCH, or PSFCH. The power control request information may be sent in a unicast, multicast or broadcast manner.
Optionally, the power control request information may take at least one of the following forms: a portion of the feedback information sent to the interfering UE in the physical sidelink feedback channel PSFCH, a portion of the data information sent to the interfering UE in the physical sidelink data channel PSCCH, a portion of the control information transmitted in the physical sidelink control channel PSCCH, or a portion of the higher layer signaling.
Optionally, the power control request information may be in the form of: the L1 feedback, which is a multi-threaded multi-connection like TPC, is sent as a kind of data information in the PSCCH to the interfering UE, or is transmitted as part of the sidelink control information SCI in the PSCCH.
< Power control target UE Power adjustment >
In the embodiment of the present invention, after receiving the power control request information, the power control target UE may determine the transmission power based on the information Y, and specifically may determine whether to perform power adjustment, and if so, whether to increase the transmission power or decrease the transmission power.
Specifically, with respect to the information Y, it may include at least one of the following various information: feedback information of a receiving end UE in the sidelink communication, historical measurement information in the sending window, the number of received power control request information, the frequency of receiving the power control request information, the priority of a service and auxiliary information of other terminals in the sidelink communication.
More specifically, the information Y may include at least one of the following information: and the receiving end UE SINR, BLER, HARQ, CSI, RSRP, RSRQ, RSSI and the transmission type of the power control request information are unicast, the transmission type of the power control request information is multicast, and the transmission type of the power control request information is broadcast, QoS requirement and channel occupancy rate.
In the embodiment of the present invention, the power adjustment of the power control target UE may be increased, may be decreased, or may not be adjusted, and may be determined by the information Y. The following describes the determination process by taking the power control target UE as the interfering UE.
In one embodiment of the invention, if the information Y comprises a receive SINR, the receive SINR is compared with a seventh threshold value, wherein,
optionally, if the SINR of the receiving end is greater than the seventh threshold, it is determined to decrease the transmission power;
optionally, if the SINR of the receiving end is less than or equal to the seventh threshold, it is determined not to adjust the transmission power.
The seventh threshold may be an SINR related to the modulation and coding scheme MCS of the current transmission. For example, when the BLER is a preset percentage (e.g., 10%), the MCS corresponds to a theoretical SINR value.
In one embodiment of the invention, if the information Y comprises a CQI, the CQI is compared with an eighth threshold value, wherein,
optionally, if the CQI is greater than an eighth threshold, it is determined to decrease the transmission power;
optionally, if the CQI is less than or equal to the eighth threshold, it is determined not to adjust the transmission power.
The eighth threshold may be an efficiency value (i.e., a product of a modulation order and a code rate) of the MCS transmitted this time.
In an embodiment of the present invention, if the power control request information received by the power control target UE includes the display indication information, the power control target UE (e.g., the interfering UE) adjusts its own transmission power according to the display indication information.
The display indication information indicates the power control target UE to adjust the transmission power in a specified manner, for example, the display indication indicates to adjust (may be to increase or decrease) the transmission power, and may also indicate an adjustment amplitude (i.e., a step size).
< Transmission Power adjustment mode >
The embodiment of the invention can adopt a plurality of ways to adjust the transmitting power of the power control target UE, and different adjusting ways are different in the aspects of adjusting time, adjusting times and/or adjusting step length and the like.
The following example describes the adjustment method in detail, and is applicable to both cases where the power control target UE is an interfering UE or an originating UE.
In an embodiment of the present invention, if the power control target UE receives multiple pieces of power control request information within a unit time duration, the transmit power is adjusted once within the unit time duration. The adjustment step length may be a preset fixed step length. For example, the step size of the power adjustment may be a network pre-configuration or a protocol pre-defined fixed step size (e.g., 2 dB).
In an embodiment of the present invention, if the power control target UE receives multiple pieces of power control request information within a unit time length, the transmit power is adjusted once within the unit time length, and an adjustment step size is determined according to the number of the received power control request information, for example, the adjustment step size is a product of the number of the received power control request information and a predefined fixed step size.
In an embodiment of the present invention, iterative power adjustment may also be performed, specifically, if the power control target UE receives N pieces of power control request information within one unit time duration, the transmit power is adjusted N times within the unit time duration (N is a positive integer). Wherein the number of iterations (i.e. the number of adjustments to the transmit power) should be less than or equal to a predetermined number, e.g. the power adjustment is stopped when the number of iterations reaches a number pre-configured by the network or predefined by the protocol.
It should be noted that the unit time length may be: slot, subframe, symbol, or frame.
In addition, in an embodiment of the present invention, if the adjusted transmission power for the ith time is less than the first predetermined threshold, the transmission power of the power control target UE is not reduced, and a power hovering indication may be sent to a higher layer.
In an embodiment of the present invention, if the adjusted transmission power for the jth time is greater than the second predetermined threshold, the transmission power of the power control target UE is not increased any more, and a power hovering indication may be further sent to a higher layer.
Wherein, for the first predetermined threshold and the second predetermined threshold, both can be determined by at least one of the following methods: the determination is based on configuration information of a higher layer, a predetermined protocol, and a predefined manner.
In an embodiment of the present invention, if the power control request information includes display indication information, the power control target UE adjusts (e.g., increases or decreases) its own transmit power according to the display indication information, and the display indication information is used to instruct the power control target UE to specify a manner to adjust the transmit power, and may also indicate a specific adjustment step length.
< Power control target UE is originating UE >
The type of the power control target UE can be determined based on the above embodiments of the present invention. If the power control target UE is determined to be the originating UE, under the condition, the originating UE can receive the reported information carried by the receiving UE on SCI, SFCI, PSCCH, PSSCH, PSFCH or high-level signaling, and adjust the transmitting power according to the reported information.
The reporting information may include at least one of the following: receiving end SINR, BLER, HARQ, CSI, RSRP, RSRQ, RSSI, pathloss, geographical location information, interference source number and display indication information.
In an embodiment of the present invention, if the report information includes a receiving end SINR, the receiving end SINR is compared with a ninth threshold value, wherein,
optionally, if the SINR of the receiving end is greater than the ninth threshold, the transmitting power is decreased;
optionally, if the SINR of the receiving end is less than or equal to the ninth threshold, the transmitting power is increased.
The ninth threshold may be an SINR related to the modulation and coding scheme MCS of the current transmission. For example, when the BLER is a preset percentage (e.g., 10%), the MCS corresponds to a theoretical SINR value.
In an embodiment of the present invention, if the reported information includes CQI, the CQI is compared with a tenth threshold value, wherein,
optionally, if the CQI is greater than a tenth threshold, the transmission power is reduced;
optionally, if the CQI is less than or equal to the tenth threshold, the transmission power is increased.
Wherein, the tenth threshold value can take the efficiency value (i.e. the product of the modulation order and the code rate) corresponding to the MCS used this time.
In an embodiment of the present invention, if the reporting information includes HARQ and is unicast transmission, wherein,
optionally, if the HARQ ACK is received, the transmit power is reduced;
optionally, if a HARQ NACK is received, the transmit power is increased.
In an embodiment of the present invention, if the reported information includes HARQ and is multicast transmission, comparing the ratio of ACK to NACK with an eleventh threshold, wherein,
optionally, if the ratio is greater than an eleventh threshold, reducing the transmission power;
optionally, if the ratio is smaller than or equal to an eleventh threshold, the transmission power is increased.
In an embodiment of the present invention, if the reported information includes display indication information, the power control target UE adjusts (e.g., increases or decreases) its own transmit power according to the display indication information; the display indication information is used for indicating the power control target UE to adjust the transmitting power according to a specified mode, and can also indicate a specific adjustment step length.
It should be noted that, in the above various embodiments of the present invention, all of the mentioned multiple threshold values (e.g. the first threshold value, the second threshold value, the third threshold value, etc.) may be determined in various ways, for example, may be preconfigured by a network, or predefined by a protocol, or set to have a mapping relationship with a preset fixed value, etc.
The embodiment of the invention provides a power control method on sidelink, and the UE of a power control target can adjust the transmission power based on request information, feedback information or measurement results and the like. The invention can realize the control of the sending power of the UE end, and achieves the purposes of interference coordination, system throughput improvement and system overall performance improvement. Compared with the prior power control mechanism, the invention can realize power control under the condition of no network coverage, can ensure that the power control effect is better and more accurate, and achieves the aims of reducing power waste, reducing interference and improving the overall performance of the system.
The following describes a process of implementing power control in sidelink communication based on the power control method according to the embodiment of the present invention by using a plurality of specific embodiments.
Example one
In this embodiment, all UEs communicate with a maximum transmission power of 23dBm in the initial stage. Within a certain transmission time interval TTI, UE1 communicates with UE2, UE3 communicates with UE4, and UE5 communicates with UE6 (the former is TX and the latter is RX).
1, the UE2 measures that the SINR at the receiving end is 1dB, and the UE2 knows that the UE1 uses CQI level 7 for data transmission, so that when the BLER is 10%, the threshold SINR value corresponding to the CQI level is about 5 dB.
UE2 compares the receive SINR to the threshold SINR, and since the receive SINR is less than the threshold SINR, further compares the interfering link RSRP to the signal link RSRP for UE2, such as:
the RSRP1 of the signal link is-90 dBm,
the RSRP2 of the interfering link to which UE3 corresponds is-85 dBm,
the RSRP3 of the interfering link to which the UE5 corresponds is-92 dBm.
RSRP1, RSRP2, and RSRP3 are compared, and therefore, RSRP2 is greater than RSRP1, and RSRP3 is less than RSRP1, it is determined that UE3 is the power control target UE.
UE2 sends a power adjustment request to UE 3.
And 4, after receiving the power adjustment request, the UE3 determines whether to perform power adjustment according to the comparison result of the receiving end SINR and the threshold value, wherein the measured receiving end SINR of the UE3 is 10dB, and the corresponding threshold SINR value is about 5 dB. If the receive SINR is greater than the threshold SINR, the UE3 reduces its own transmit power by 23dBm-2dB to 21 dBm.
Example two
In this embodiment, all UEs communicate with a maximum transmission power of 23dBm in the initial stage. Within a certain TTI, UE1 communicates with UE2, UE3 communicates with UE4, and UE5 communicates with UE6 (the former is TX and the latter is RX).
1. The receiving UE2 has a 15% received data BLER and a 10% threshold BLER.
UE2 compares the receive end BLER to the threshold BLER because the receive end BLER is greater than the threshold BLER. Then further, for the UE2, the interfering link pathloss is compared with the signal link pathloss, such as:
pathloss1 for the signal link is 90dB,
the pathloss2 of the interfering link to the UE3 is 80dB,
the pathloss3 of the interfering link for UE5 is 110 dB.
Compare pathloss1, pathloss2, and pathloss 3.
Because pathloss2 is smaller than pathloss1 and pathloss3 is larger than pathloss1, it is determined that UE3 is the power control target UE.
UE2 shows instructing UE3 to reduce transmit power by 2 dB.
Upon receiving the display instruction information, the UE3 reduces its own transmission power by 23dBm-2dB to 21 dBm.
EXAMPLE III
In this embodiment, all UEs communicate with a maximum transmission power of 23dBm in the initial stage. Within a certain TTI, UE1 communicates with UE2, UE3 communicates with UE4, and UE5 communicates with UE6 (the former is TX and the latter is RX).
1, the UE2 reports the SINR of its receiving end to the originating UE1 as 20 dB.
2. The originating UE1 determines that, according to the CQI level used by itself to send data, when the BLER is 10%, the threshold SINR value corresponding to the CQI level is about 5 dB.
3. The originating UE1 compares the terminating SINR reported by UE2 with the threshold SINR, because the terminating SINR is greater than the threshold SINR, then UE1 reduces its own transmit power by 23dBm-2dB to 21 dBm.
Example four
In this embodiment, all UEs communicate with a maximum transmission power of 23dBm in the initial stage. Within a certain TTI, UE1 communicates with UE2, UE3 communicates with UE4, and UE5 communicates with UE6 (the former is TX and the latter is RX).
1. The receiving UE2 measures the SINR to be 20dB, and the UE2 knows that the UE1 uses CQI level 7 for data transmission, so that when the BLER is 10%, the threshold SINR value corresponding to the CQI level is about 5 dB.
UE2 compares the receive SINR to a threshold SINR, and sends an indication to UE1 to reduce transmit power because the receive SINR is greater than the threshold SINR.
The UE1 reduces its own transmission power by 23dBm-2dB to 21dBm based on the received display instruction information.
Corresponding to the foregoing power control method, the present invention further provides a power control apparatus applied to a terminal, and referring to fig. 3, the power control apparatus includes:
an information receiving module 10, configured to receive power control request information from a first terminal in sidelink communication, where the first terminal is an information receiving terminal in the sidelink communication;
a transmission power determining module 20, configured to determine a transmission power of the second terminal based on the first information; wherein the first information is obtained by the second terminal from the outside or measured by the second terminal.
Optionally, the first information comprises at least one of: feedback information of a receiving terminal in the sidelink communication, historical measurement information in a sensing window, the number of received power control request information, the frequency of receiving the power control request information, the priority of a service, and auxiliary information of other terminals in the sidelink communication.
Optionally, if the first information includes a receiving terminal SINR, comparing the receiving terminal SINR with a first threshold value to determine a transmit power of the second terminal in the sidelink communication; wherein the first threshold value is determined by at least one of the following ways: the determination is based on configuration information of a higher layer, a predetermined protocol, and a predefined manner.
Optionally, the adjusting manner of the transmission power includes: and if the second terminal receives a plurality of pieces of power control request information in a unit time length, adjusting the transmitting power once in the unit time length.
Optionally, the adjusting manner of the transmission power includes: if the second terminal receives a plurality of power control request messages in a unit time length, the transmitting power is adjusted once in the unit time length, and the adjusting step length is determined according to the number of the received power control request messages.
Optionally, the adjustment step size is a product of the number of received power control request messages and a predetermined step size.
Optionally, the adjusting manner of the transmission power includes: and if the second terminal receives N pieces of power control request information in a unit time length, adjusting the transmitting power for N times in the unit time length, wherein N is a positive integer.
Optionally, the unit time length is determined from at least one of: slot, subframe, symbol, frame.
Optionally, if the adjusted transmission power for the ith time is less than a first predetermined threshold, the transmission power of the second terminal is not reduced, where i is a positive integer, and the first predetermined threshold is determined by at least one of the following manners: the determination is based on configuration information of a higher layer, a predetermined protocol, and a predefined manner.
Optionally, if the adjusted transmission power for the jth time is greater than a second predetermined threshold, the transmission power of the second terminal is not increased any more, where j is a positive integer, and the second predetermined threshold is determined by at least one of the following manners: the determination is based on configuration information of a higher layer, a predetermined protocol, and a predefined manner.
Optionally, if the power control request information includes display indication information, the second terminal adjusts transmission power according to the display indication information.
Corresponding to the foregoing power control method, the present invention further provides a power control apparatus applied to a terminal, including:
the type determining module is used for determining the type of the power control target terminal based on the second information in the side link communication; the type determining module is located in an information receiving terminal in the sidelink communication, and the second information is obtained by the first terminal from the outside or is obtained by the first terminal through measurement.
Optionally, the second information comprises at least one of: historical measurement information, channel measurement information, interference measurement information, solution control information, auxiliary information of other terminals in sidelink communication and data packet statistical result information in the sensing window.
Optionally, if the second information includes a receiving terminal SINR, comparing the receiving terminal SINR with a second threshold value to determine a type of a power control target terminal in the sidelink communication; wherein the second threshold value is determined by at least one of: the determination is based on configuration information of a higher layer, a predetermined protocol, and a predefined manner.
Optionally, in a case that it is determined that the type of the power control target terminal is an interfering terminal, the power control apparatus further includes: a target terminal determination module for determining a power control target terminal among the one or more interfering terminals based on the measurement result; wherein the measurement result comprises at least one of the second information.
Optionally, if the measurement result includes RSRP of an interfering link, the RSRP is compared with a third threshold value to determine a power control target terminal in the sidelink communication.
Optionally, the third threshold is RSRP of a signal link or a sum of RSRP of the signal link and a preset compensation value.
Optionally, after determining the power control target terminal, the power control apparatus further includes: and the information sending module is used for sending power control request information to the power control target terminal, wherein the power control request information is used for requesting the power control target terminal to adjust the transmitting power.
Optionally, the power control request information takes at least one of the following forms: a part of the feedback information sent to the interfering terminal in the physical sidelink feedback channel PSFCH, a part of the data information sent to the interfering terminal in the physical sidelink data channel PSCCH, a part of the control information transmitted in the physical sidelink control channel PSCCH.
Optionally, the transmission type of the power control request information is at least one of the following manners: unicast, multicast, broadcast.
By using the power control apparatus of the embodiment of the present invention, the power control target UE may adjust the transmission power based on the request information, the feedback information, or the measurement result. The invention can realize the control of the sending power of the UE end, and achieves the purposes of interference coordination, system throughput improvement and system overall performance improvement. Compared with the prior power control mechanism, the invention can realize power control under the condition of no network coverage, can ensure that the power control effect is better and more accurate, and achieves the aims of reducing power waste, reducing interference and improving the overall performance of the system.
Figure 4 is a schematic diagram of a hardware structure of a mobile terminal implementing an embodiment of the present invention,
the mobile terminal 100 includes, but is not limited to: radio frequency unit 101, network module 102, audio output unit 103, input unit 104, sensor 105, display unit 106, user input unit 107, interface unit 108, memory 109, processor 110, and power supply 111. Those skilled in the art will appreciate that the mobile terminal architecture shown in fig. 4 is not intended to be limiting of mobile terminals, and that a mobile terminal may include more or fewer components than shown, or some components may be combined, or a different arrangement of components. In the embodiment of the present invention, the mobile terminal includes, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a palm computer, a vehicle-mounted terminal, a wearable device, a pedometer, and the like.
The mobile terminal of the embodiment of the invention can realize the control of the terminal sending power, and achieves the purposes of interference coordination, system throughput improvement and system overall performance improvement.
It should be understood that, in the embodiment of the present invention, the radio frequency unit 101 may be used for receiving and sending signals during a message transmission or call process, and specifically, after receiving downlink data from a base station, the downlink data is processed by the processor 110; in addition, the uplink data is transmitted to the base station. Typically, radio frequency unit 101 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like. In addition, the radio frequency unit 101 can also communicate with a network and other devices through a wireless communication system.
The mobile terminal provides wireless broadband internet access to the user through the network module 102, such as helping the user send and receive e-mails, browse webpages, access streaming media, and the like.
The audio output unit 103 may convert audio data received by the radio frequency unit 101 or the network module 102 or stored in the memory 109 into an audio signal and output as sound. Also, the audio output unit 103 may also provide audio output related to a specific function performed by the mobile terminal 100 (e.g., a call signal reception sound, a message reception sound, etc.). The audio output unit 103 includes a speaker, a buzzer, a receiver, and the like.
The input unit 104 is used to receive an audio or video signal. The input Unit 104 may include a Graphics Processing Unit (GPU) 1041 and a microphone 1042, and the Graphics processor 1041 processes image data of a still picture or video obtained by an image capturing device (e.g., a camera) in a video capturing mode or an image capturing mode. The processed image frames may be displayed on the display unit 106. The image frames processed by the graphic processor 1041 may be stored in the memory 109 (or other storage medium) or transmitted via the radio frequency unit 101 or the network module 102. The microphone 1042 may receive sound and may be capable of processing such sound into audio data. The processed audio data may be converted into a format output transmittable to a mobile communication base station via the radio frequency unit 101 in case of a phone call mode.
The mobile terminal 100 also includes at least one sensor 105, such as a light sensor, a motion sensor, and other sensors. Specifically, the light sensor includes an ambient light sensor that can adjust the brightness of the display panel 1061 according to the brightness of ambient light, and a proximity sensor that can turn off the display panel 1061 and/or a backlight when the mobile terminal 100 is moved to the ear. As one of the motion sensors, the accelerometer sensor can detect the magnitude of acceleration in each direction (generally three axes), detect the magnitude and direction of gravity when stationary, and can be used to identify the posture of the mobile terminal (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), and vibration identification related functions (such as pedometer, tapping); the sensors 105 may also include fingerprint sensors, pressure sensors, iris sensors, molecular sensors, gyroscopes, barometers, hygrometers, thermometers, infrared sensors, etc., which are not described in detail herein.
The display unit 106 is used to display information input by a user or information provided to the user. The Display unit 106 may include a Display panel 1061, and the Display panel 1061 may be configured in the form of a Liquid Crystal Display (LCD), an Organic Light-Emitting Diode (OLED), or the like.
The user input unit 107 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the mobile terminal. Specifically, the user input unit 107 includes a touch panel 1071 and other input devices 1072. Touch panel 1071, also referred to as a touch screen, may collect touch operations by a user on or near the touch panel 1071 (e.g., operations by a user on or near touch panel 1071 using a finger, stylus, or any suitable object or attachment). The touch panel 1071 may include two parts of a touch detection device and a touch controller. The touch detection device detects the touch direction of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch sensing device, converts the touch information into touch point coordinates, sends the touch point coordinates to the processor 110, and receives and executes commands sent by the processor 110. In addition, the touch panel 1071 may be implemented in various types, such as a resistive type, a capacitive type, an infrared ray, and a surface acoustic wave. In addition to the touch panel 1071, the user input unit 107 may include other input devices 1072. Specifically, other input devices 1072 may include, but are not limited to, a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which are not described in detail herein.
Further, the touch panel 1071 may be overlaid on the display panel 1061, and when the touch panel 1071 detects a touch operation thereon or nearby, the touch panel 1071 transmits the touch operation to the processor 110 to determine the type of the touch event, and then the processor 110 provides a corresponding visual output on the display panel 1061 according to the type of the touch event. Although in fig. 4, the touch panel 1071 and the display panel 1061 are two independent components to implement the input and output functions of the mobile terminal, in some embodiments, the touch panel 1071 and the display panel 1061 may be integrated to implement the input and output functions of the mobile terminal, and is not limited herein.
The interface unit 108 is an interface through which an external device is connected to the mobile terminal 100. For example, the external device may include a wired or wireless headset port, an external power supply (or battery charger) port, a wired or wireless data port, a memory card port, a port for connecting a device having an identification module, an audio input/output (I/O) port, a video I/O port, an earphone port, and the like. The interface unit 108 may be used to receive input (e.g., data information, power, etc.) from external devices and transmit the received input to one or more elements within the mobile terminal 100 or may be used to transmit data between the mobile terminal 100 and external devices.
The memory 109 may be used to store software programs as well as various data. The memory 109 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. Further, the memory 109 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.
The processor 110 is a control center of the mobile terminal, connects various parts of the entire mobile terminal using various interfaces and lines, and performs various functions of the mobile terminal and processes data by operating or executing software programs and/or modules stored in the memory 109 and calling data stored in the memory 109, thereby performing overall monitoring of the mobile terminal. Processor 110 may include one or more processing units; preferably, the processor 110 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 110.
The mobile terminal 100 may further include a power supply 111 (e.g., a battery) for supplying power to various components, and preferably, the power supply 111 may be logically connected to the processor 110 via a power management system, so as to manage charging, discharging, and power consumption management functions via the power management system.
In addition, the mobile terminal 100 includes some functional modules that are not shown, and thus, the detailed description thereof is omitted.
The terminal device provided by the embodiment of the present invention can implement each process implemented by the mobile terminal in the foregoing method embodiments, and for avoiding repetition, details are not described here again.
Preferably, an embodiment of the present invention further provides a mobile terminal, which includes a processor 110, a memory 109, and a computer program stored in the memory 109 and capable of running on the processor 110, where the computer program, when executed by the processor 110, implements each process of the above power control method embodiment, and can achieve the same technical effect, and in order to avoid repetition, details are not described here again.
An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements each process of the foregoing power control method embodiment, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (25)

1. A power control method applied to a terminal includes:
in side link communication, a second terminal receives power control request information from a first terminal, wherein the first terminal is an information receiving terminal in the side link communication;
the second terminal determines the transmission power of the second terminal based on the first information; wherein the first information is obtained by the second terminal from the outside or measured by the second terminal.
2. The method of claim 1, wherein,
the first information comprises at least one of: feedback information of a receiving terminal in the sidelink communication, historical measurement information in a sensing window, the number of received power control request information, the frequency of receiving the power control request information, the priority of a service, and auxiliary information of other terminals in the sidelink communication.
3. The method of claim 1, wherein,
comparing the receiving terminal SINR with a first threshold value to determine a transmit power of the second terminal in the sidelink communication if the first information comprises a receiving terminal signal to interference plus noise ratio (SINR); wherein,
determining the first threshold value by at least one of: the determination is based on configuration information of a higher layer, a predetermined protocol, and a predefined manner.
4. The method of claim 1, wherein,
the adjustment mode of the transmitting power comprises the following steps: and if the second terminal receives a plurality of pieces of power control request information in a unit time length, adjusting the transmitting power once in the unit time length.
5. The method of claim 1, wherein,
the adjustment mode of the transmitting power comprises the following steps: if the second terminal receives a plurality of power control request messages in a unit time length, the transmitting power is adjusted once in the unit time length, and the adjusting step length is determined according to the number of the received power control request messages.
6. The method of claim 5, wherein,
the adjustment step size is the product of the number of the received power control request messages and a preset step size.
7. The method of claim 1, wherein,
the adjustment mode of the transmitting power comprises the following steps: and if the second terminal receives N pieces of power control request information in a unit time length, adjusting the transmitting power for N times in the unit time length, wherein N is a positive integer.
8. The method of claim 7, wherein,
and the adjustment times of the transmission power by the second terminal are less than or equal to the preset times.
9. The method according to any one of claims 4 to 8, wherein,
determining the unit time length from at least one of: slot, subframe, symbol, frame.
10. The method according to any one of claims 4 to 8, wherein,
if the adjusted transmission power for the ith time is smaller than a first preset threshold value, the transmission power of the second terminal is not reduced any more, wherein i is a positive integer, and the first preset threshold value is determined by at least one of the following modes: the determination is based on configuration information of a higher layer, a predetermined protocol, and a predefined manner.
11. The method according to any one of claims 4 to 8, wherein,
if the adjusted transmission power of the jth time is larger than a second preset threshold value, the transmission power of the second terminal is not increased any more, wherein j is a positive integer, and the second preset threshold value is determined by at least one of the following modes: the determination is based on configuration information of a higher layer, a predetermined protocol, and a predefined manner.
12. The method of claim 1, wherein,
and if the power control request information comprises display indication information, the second terminal adjusts the transmitting power according to the display indication information.
13. A power control method applied to a terminal includes:
in the side link communication, the first terminal determines the type of the power control target terminal based on the second information; the first terminal is an information receiving terminal in the sidelink communication, and the second information is obtained by the first terminal from the outside or is obtained by the first terminal through measurement.
14. The method of claim 13, wherein,
the second information comprises at least one of: historical measurement information, channel measurement information, interference measurement information, solution control information, auxiliary information of other terminals in sidelink communication and data packet statistical result information in the sensing window.
15. The method of claim 13, wherein,
if the second information comprises receiving terminal SINR, comparing the receiving terminal SINR with a second threshold value to determine the type of a power control target terminal in the sidelink communication; wherein,
determining the second threshold value by at least one of: the determination is based on configuration information of a higher layer, a predetermined protocol, and a predefined manner.
16. The method of claim 13, wherein,
in the case that the type of the power control target terminal is determined to be an interfering terminal, the method further includes:
the first terminal determines a power control target terminal from one or more interference terminals based on the measurement result; wherein the measurement result comprises at least one of the second information.
17. The method of claim 16, wherein,
and if the measurement result comprises the RSRP generating the interference link, comparing the RSRP with a third threshold value to determine a power control target terminal in the side link communication.
18. The method of claim 17, wherein,
the third threshold value is the RSRP of the signal link or the sum of the RSRP of the signal link and a preset compensation value.
19. The method of claim 16, wherein,
after determining the power control target terminal, the method further includes:
and the first terminal sends power control request information to the power control target terminal, wherein the power control request information is used for requesting the power control target terminal to adjust the transmission power.
20. The method of claim 19, wherein,
the power control request information takes at least one of the following forms: a part of the feedback information sent to the interfering terminal in the physical sidelink feedback channel PSFCH, a part of the data information sent to the interfering terminal in the physical sidelink data channel PSCCH, a part of the control information transmitted in the physical sidelink control channel PSCCH.
21. The method of claim 19, wherein,
the transmission type of the power control request information is at least one of the following modes: unicast, multicast, broadcast.
22. A power control apparatus, applied to a terminal, comprising:
an information receiving module, configured to receive power control request information from a first terminal in sidelink communication, where the first terminal is an information receiving terminal in the sidelink communication;
a transmission power determination module, configured to determine a transmission power of the second terminal based on the first information; wherein the first information is obtained by the second terminal from the outside or measured by the second terminal.
23. A power control apparatus, applied to a terminal, comprising:
the type determining module is used for determining the type of the power control target terminal based on the second information in the side link communication; the type determining module is located in an information receiving terminal in the sidelink communication, and the second information is obtained by the first terminal from the outside or is obtained by the first terminal through measurement.
24. A terminal, characterized in that the terminal comprises a processor, a memory and a computer program stored on the memory and being executable on the processor, the computer program, when executed by the processor, implementing the steps of the power control method according to claims 1-12 or the steps of the power control method according to any of claims 13-21.
25. A computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, which computer program, when being executed by a processor, carries out the steps of the power control method according to claims 1-12 or the steps of the power control method according to any of claims 13-21.
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