WO2019148411A1

WO2019148411A1 - User equipment and method of wireless communication of same

Info

Publication number: WO2019148411A1
Application number: PCT/CN2018/074917
Authority: WO
Inventors: Huei-Ming Lin; Hai Tang
Original assignee: Guangdong Oppo Mobile Telecommunications Corp., Ltd.
Priority date: 2018-02-01
Filing date: 2018-02-01
Publication date: 2019-08-08
Also published as: CN111492695A; CN111492695B

Abstract

A user equipment and a method of wireless communication of the same are provided. The user equipment includes a memory and a processor coupled to the memory. The processor is configured to perform a wireless communication directly over a sidelink interface to a second user equipment, transmit at least one data transport block including at least one reference signal to the second user equipment, and receive, from the second user equipment, a power setting indication.

Description

USER EQUIPMENT AND METHOD OF WIRELESS COMMUNICATION OF SAME

BACKGROUND OF DISCLOSURE

1. Field of Disclosure

The present disclosure relates to the field of communication systems, and more particularly, to a user equipment and a method of wireless communication of same.

2. Description of Related Art

According to long term evolution (LTE) sidelink technology developed under 3rd generation partnership project (3GPP) in Release 14, user equipment (UE) is required to transmit at maximum allowable power over an LTE sidelink such as PC5 interface for vehicle-to-everything (V2X) communication including vehicle-to-vehicle (V2V) , vehicle-to-pedestrian (V2P) , and vehicle-to-infrastructure/network (V2I/N) . The UEs transmit at the maximum allowable power regardless of channel type such as control channel or data channel, signal type such as synchronization signals or reference signals, operating condition such as in-network coverage or out-of-network coverage, and communication type such as broadcast, groupcast or unicast to achieve maximum signal coverage and communication range.

However, this is an inefficient way of using UE’s total available power for direct UE-to-UE communication when a required communication range is much less than a signal coverage from transmitting at the maximum allowable power. For example, a target receiving UE is in proximity to or adjacent to a transmitting UE, the transmitting UE is travelling at a low speed, or low data-rate/modulation and coding selection (MCS) level. Additionally, by transmitting sidelink signals and channels at a power level greater than a required power level would also increase interference to signal transmissions from other UEs outside the required communication range, which, thus, limits a number of available resources that can be utilized by others.

SUMMARY

An object of the present disclosure is to propose a user equipment (UE) and a method of wireless communication of the same capable of controlling and setting appropriate power setting indication for a transmitting UE for direct wireless communication over a sidelink interface.

In a first aspect of the present disclosure, a user equipment for wireless communication includes a memory and a processor coupled to the memory. The processor is configured to perform a wireless communication directly over a sidelink interface to a second user equipment, transmit at least one data transport block including at least one reference signal to the second user equipment, and receive, from the second user equipment, a power setting indication.

According to an embodiment in conjunction to the first aspect of the present disclosure, the at least one data transport block includes at least one of a physical sidelink control channel (PSCCH) , a physical sidelink shared channel (PSSCH) , a physical sidelink broadcast channel (PSBCH) , a tracking reference signal, and a sidelink synchronization signal (SLSS) , and the at least one reference signal is at least one demodulation reference signal (DMRS) for at least one of the PSCCH, the PSSCH, the PSBCH, the tracking reference signal, and the SLSS.

According to an embodiment in conjunction to the first aspect of the present disclosure, the processor is further configured to receive a network controlled transmission power control (TPC) command and transmit a training reference signal using maximum power within the network controlled TPC command.

According to an embodiment in conjunction to the first aspect of the present disclosure, the power setting indication is derived separately or jointly for a PSCCH and a PSSCH to allow different power boosting levels between the PSCCH and the PSSCH.

According to an embodiment in conjunction to the first aspect of the present disclosure, the processor is further configured to receive at least one second data transport block including at least one second reference signal from the second user equipment, derive a second power setting indication according to the at least one second reference signal, and transmit, to the second user equipment, the second power setting indication.

According to an embodiment in conjunction to the first aspect of the present disclosure, the processor is further configured to calculate a reference signal received power (RSRP) level according to the at least one second reference signal and derive the second power setting indication according to the reference signal received power level.

According to an embodiment in conjunction to the first aspect of the present disclosure, the processor is configured to periodically receive the at least one second reference signal and feed back the second power setting indication to the second user equipment.

According to an embodiment in conjunction to the first aspect of the present disclosure, the user equipment further includes at least one feedback channel, and the processor is configured to transmit, to the second user equipment, the second power setting indication via the at least one feedback channel.

According to an embodiment in conjunction to the first aspect of the present disclosure, a number of the at least one feedback channel is at least two, a periodicity of the at least two feedback channels is every 5, 10, 20, 50, or 100ms depending on carrier tone spacing.

According to an embodiment in conjunction to the first aspect of the present disclosure, a size of the at least one feedback channel is one slot in a time domain and at least one physical resource block in a frequency domain.

According to an embodiment in conjunction to the first aspect of the present disclosure, the at least one feedback channel includes a guard period (GP) for transmission/reception switching, an orthogonal frequency division multiplexing (OFDM) symbol for receiving automatic gain control (AGC) , and a feedback data region including at least one of a DMRS resource element and an information resource element.

According to an embodiment in conjunction to the first aspect of the present disclosure, the user equipment further includes at least one sidelink control information, and the processor is configured to encode the second power setting indication in the at least one sidelink control information in a PSCCH.

According to an embodiment in conjunction to the first aspect of the present disclosure, the processor is configured to schedule at least one sidelink control information at a beginning of a transmission time interval (TTI) and assign a feedback region in an end of the TTI.

According to an embodiment in conjunction to the first aspect of the present disclosure, the feedback region includes a guard period (GP) of symbols for transmission/reception switching, a calculation of RSRP level, the power setting indication, an OFDM symbol for receiving AGC, and a feedback data region including at least one of a DMRS resource element and an information resource element.

According to an embodiment in conjunction to the first aspect of the present disclosure, the processor is configured to receive, from the second user equipment, the power setting indication via an upper layer medium access control control element (MAC-CE) carried in a PSSCH.

According to an embodiment in conjunction to the first aspect of the present disclosure, the power setting indication is represented by one bit to provide two power setting indication values.

According to an embodiment in conjunction to the first aspect of the present disclosure, the power setting indication is represented by two bits to provide four power setting indication values.

According to an embodiment in conjunction to the first aspect of the present disclosure, the power setting indication is represented by three bits to provide eight power setting indication values.

In a second aspect of the present disclosure, a user equipment for wireless communication includes a memory and a processor coupled to the memory. The processor is configured to perform a wireless communication directly over a sidelink interface to a second user equipment, receive at least one data transport block including at least one reference signal from the second user equipment, calculate a reference signal received power level according to the at least one reference signal, derive a power setting indication according to the reference signal received power level, and transmit, to the second user equipment, the power setting indication.

According to another embodiment in conjunction to the second aspect of the present disclosure, the at least one data transport block includes at least one of a physical sidelink control channel (PSCCH) , a physical sidelink shared channel (PSSCH) , a physical sidelink broadcast channel (PSBCH) , a tracking reference signal, and a sidelink synchronization signal (SLSS) , the at least one reference signal is at least one demodulation reference signal (DMRS) for at least one of the PSCCH, the PSSCH, the PSBCH, the tracking reference signal, and the SLSS.

According to another embodiment in conjunction to the second aspect of the present disclosure, the power setting indication is derived separately or jointly for a PSCCH and a PSSCH to allow different power boosting levels between the PSCCH and the PSSCH.

According to another embodiment in conjunction to the second aspect of the present disclosure, the processor is further configured to transmit at least one second data transport block including at least one second reference signal to the second user equipment, and receive, from the second user equipment, a second power setting indication.

According to another embodiment in conjunction to the second aspect of the present disclosure, the user equipment further including at least one feedback channel, wherein the processor is configured to transmit, to the second user equipment, the power setting indication via the at least one feedback channel.

According to another embodiment in conjunction to the second aspect of the present disclosure, a number of the at least one feedback channel is at least two, a periodicity of the at least two feedback channels is every 5, 10, 20, 50, or 100ms depending on carrier tone spacing.

According to another embodiment in conjunction to the second aspect of the present disclosure, a size of the at least one feedback channel is one slot in a time domain and at least one physical resource block in a frequency domain.

According to another embodiment in conjunction to the second aspect of the present disclosure, the at least one feedback channel includes a guard period (GP) for transmission/reception switching, an orthogonal frequency division multiplexing (OFDM) symbol for receiving automatic gain control (AGC) , and a feedback data region including at least one of a DMRS resource element and an information resource element.

According to another embodiment in conjunction to the second aspect of the present disclosure, the user equipment further includes at least one sidelink control information, and the processor is configured to encode the power setting indication in the at least one sidelink control information in a PSCCH.

According to another embodiment in conjunction to the second aspect of the present disclosure, the processor is configured to schedule at least one sidelink control information at a beginning of a transmission time interval (TTI) and assign a feedback region in an end of the TTI.

According to another embodiment in conjunction to the second aspect of the present disclosure, the feedback region includes a guard period (GP) of symbols for transmission/reception switching, a calculation of RSRP level, the power setting indication, an OFDM symbol for receiving AGC, and a feedback data region including at least one of a DMRS resource element and an information resource element.

According to another embodiment in conjunction to the second aspect of the present disclosure, the processor is configured to transmit the power setting indication to the second user equipment via an upper layer medium access control control element (MAC-CE) carried in a PSSCH.

According to another embodiment in conjunction to the second aspect of the present disclosure, the power setting indication is represented by one bit to provide two power setting indication values.

According to another embodiment in conjunction to the second aspect of the present disclosure, the power setting indication is represented by two bits to provide four power setting indication values.

According to another embodiment in conjunction to the second aspect of the present disclosure, the power setting indication is represented by three bits to provide eight power setting indication values.

In a third aspect of the present disclosure, a method of wireless communication of a user equipment includes performing a wireless communication directly over a sidelink interface to a second user equipment, transmitting at least one data transport block including at least one reference signal to the second user equipment, and receiving, from the second user equipment, a power setting indication.

According to another embodiment in conjunction to the third aspect of the present disclosure, the at least one data transport block includes at least one of a physical sidelink control channel (PSCCH) , a physical sidelink shared channel (PSSCH) , a physical sidelink broadcast channel (PSBCH) , a tracking reference signal, and a sidelink synchronization signal (SLSS) , the at least one reference signal is at least one demodulation reference signal (DMRS) for at least one of the PSCCH, the PSSCH, the PSBCH, the tracking reference signal, and the SLSS.

According to another embodiment in conjunction to the third aspect of the present disclosure, the method further includes receiving a network controlled transmission power control (TPC) command and transmitting a training reference signal using maximum power within the network controlled TPC command.

According to another embodiment in conjunction to the third aspect of the present disclosure, the method further includes receiving at least one second data transport block including at least one second reference signal from the second user equipment, deriving a second power setting indication according to the at least one second reference signal, and transmitting, to the second user equipment, the second power setting indication.

According to another embodiment in conjunction to the third aspect of the present disclosure, the method further includes calculating a reference signal received power (RSRP) level according to the at least one second reference signal and deriving the second power setting indication according to the reference signal received power level.

According to another embodiment in conjunction to the third aspect of the present disclosure, the method further includes periodically receiving the at least one second reference signal and feeding back the second power setting indication to the second user equipment.

According to another embodiment in conjunction to the third aspect of the present disclosure, the method further includes transmitting, to the second user equipment, the second power setting indication via at least one feedback channel.

According to another embodiment in conjunction to the third aspect of the present disclosure, a number of the at least one feedback channel is at least two, a periodicity of the at least two feedback channels is every 5, 10, 20, 50, or 100ms depending on carrier tone spacing.

According to another embodiment in conjunction to the third aspect of the present disclosure, a size of the at least one feedback channel is one slot in a time domain and at least one physical resource block in a frequency domain.

According to another embodiment in conjunction to the third aspect of the present disclosure, the at least one feedback channel includes a guard period (GP) for transmission/reception switching, an orthogonal frequency division multiplexing (OFDM) symbol for receiving automatic gain control (AGC) , and a feedback data region including at least one of a DMRS resource element and an information resource element.

According to another embodiment in conjunction to the third aspect of the present disclosure, the method further includes encoding the second power setting indication in at least one sidelink control information in a PSCCH.

According to another embodiment in conjunction to the third aspect of the present disclosure, the method further includes scheduling at least one sidelink control information at a beginning of a transmission time interval (TTI) and assigning a feedback region in an end of the TTI.

According to another embodiment in conjunction to the third aspect of the present disclosure, the feedback region includes a guard period (GP) of symbols for transmission/reception switching, a calculation of RSRP level, the power setting indication, an OFDM symbol for receiving AGC, and a feedback data region including at least one of a DMRS resource element and an information resource element.

According to another embodiment in conjunction to the third aspect of the present disclosure, the method further includes receiving, from the second user equipment, the power setting indication via an upper layer medium access control control element (MAC-CE) carried in a PSSCH.

According to another embodiment in conjunction to the third aspect of the present disclosure, the power setting indication is represented by one bit to provide two power setting indication values.

According to another embodiment in conjunction to the third aspect of the present disclosure, the power setting indication is represented by two bits to provide four power setting indication values.

According to another embodiment in conjunction to the third aspect of the present disclosure, the power setting indication is represented by three bits to provide eight power setting indication values.

In a fourth aspect of the present disclosure, a method of wireless communication of a user equipment includes performing a wireless communication directly over a sidelink interface to a second user equipment, receiving at least one data transport block including at least one reference signal from the second user equipment, calculating a reference signal received power level according to the at least one reference signal, deriving a power setting indication according to the reference signal received power level, and transmitting, to the second user equipment, the power setting indication.

According to another embodiment in conjunction to the fourth aspect of the present disclosure, the at least one data transport block includes at least one of a physical sidelink control channel (PSCCH) , a physical sidelink shared channel (PSSCH) , a physical sidelink broadcast channel (PSBCH) , a tracking reference signal, and a sidelink synchronization signal (SLSS) , the at least one reference signal is at least one demodulation reference signal (DMRS) for at least one of the PSCCH, the PSSCH, the PSBCH, the tracking reference signal, and the SLSS.

According to another embodiment in conjunction to the fourth aspect of the present disclosure, the method further includes separately or jointly deriving the power setting indication for a PSCCH and a PSSCH to allow different power boosting levels between the PSCCH and the PSSCH.

According to another embodiment in conjunction to the fourth aspect of the present disclosure, the method further includes transmitting at least one second data transport block including at least one second reference signal to the second user equipment and receiving, from the second user equipment, a second power setting indication.

According to another embodiment in conjunction to the fourth aspect of the present disclosure, the method further includes transmitting, to the second user equipment, the power setting indication via at least one feedback channel.

According to another embodiment in conjunction to the fourth aspect of the present disclosure, a number of the at least one feedback channel is at least two, a periodicity of the at least two feedback channels is every 5, 10, 20, 50, or 100ms depending on carrier tone spacing.

According to another embodiment in conjunction to the fourth aspect of the present disclosure, the method further includes a size of the at least one feedback channel is one slot in a time domain and at least one physical resource block in a frequency domain.

According to another embodiment in conjunction to the fourth aspect of the present disclosure, the method further includes the at least one feedback channel including a guard period (GP) for transmission/reception switching, an orthogonal frequency division multiplexing (OFDM) symbol for receiving automatic gain control (AGC) , and a feedback data region including at least one of a DMRS resource element and an information resource element.

According to another embodiment in conjunction to the fourth aspect of the present disclosure, the method further includes encoding the power setting indication in at least one sidelink control information in a PSCCH.

According to another embodiment in conjunction to the fourth aspect of the present disclosure, the method further includes scheduling at least one sidelink control information at a beginning of a transmission time interval (TTI) and assign a feedback region in an end of the TTI.

According to another embodiment in conjunction to the fourth aspect of the present disclosure, the feedback region includes a guard period (GP) of symbols for transmission/reception switching, a calculation of RSRP level, the power setting indication, an OFDM symbol for receiving AGC, and a feedback data region including at least one of a DMRS resource element and an information resource element.

According to another embodiment in conjunction to the fourth aspect of the present disclosure, the method further includes transmitting the power setting indication to the second user equipment via an upper layer medium access control control element (MAC-CE) carried in a PSSCH.

According to another embodiment in conjunction to the fourth aspect of the present disclosure, the power setting indication is represented by one bit to provide two power setting indication values.

According to another embodiment in conjunction to the fourth aspect of the present disclosure, the power setting indication is represented by two bits to provide four power setting indication values.

According to another embodiment in conjunction to the fourth aspect of the present disclosure, the power setting indication is represented by three bits to provide eight power setting indication values.

In the embodiment of the present disclosure, the user equipment and the method of wireless communication of the same are capable of controlling and setting the appropriate power setting indication, such that the user equipment could save battery, perform long operation time, and/or have good operating performance from less interference.

BRIEF DESCRIPTION OF DRAWINGS

In order to more clearly illustrate the embodiments of the present disclosure or related art, the following figures will be described in the embodiments are briefly introduced. It is obvious that the drawings are merely some embodiments of the present disclosure, a person having ordinary skill in this field can obtain other figures according to these figures without paying the premise.

FIG. 1 is a block diagram of a user equipment for wireless communication according to an embodiment of the present disclosure.

FIG. 2 is a scenario of vehicle-to-everything (V2X) communication according to an embodiment of the present disclosure.

FIG. 3 is a flowchart illustrating a method of wireless communication according to the present disclosure, from an aspect of operation of a user equipment for transmitting signals.

FIG. 4 is a flowchart illustrating a method of wireless communication according to the present disclosure, from an aspect of operation of a user equipment for receiving signals.

FIG. 5 is a diagram of close-loop explicit power control/setting via a dedicated feedback channel according to an embodiment of the present disclosure.

FIG. 6 is a diagram of a data transport block according to an embodiment of the present disclosure.

FIG. 7 is a diagram of a feedback channel according to an embodiment of the present disclosure.

FIG. 8 is a diagram of close-loop explicit power control/setting via a receiver feedback in sidelink control information according to an embodiment of the present disclosure.

FIG. 9 is a diagram of close-loop explicit power control/setting via a transmitting UE triggered and an assigned feedback portion in an end of transmission time interval (TTI) according to an embodiment of the present disclosure.

DETAILED DESCRIPTION OF EMBODIMENTS

Embodiments of the present disclosure are described in detail with the technical matters, structural features, achieved objects, and effects with reference to the accompanying drawings as follows. Specifically, the terminologies in the embodiments of the present disclosure are merely for describing the purpose of the certain embodiment, but not to limit the disclosure.

FIG. 1 illustrates that, in some embodiments, a user equipment (UE) 100 for wireless communication includes a memory 102 and a processor 104 coupled to the memory 102. The processor 104 is configured to perform a wireless communication directly over a sidelink interface such as a PC5 interface to a user equipment 200, transmit at least one data transport block (data TB) including at least one reference signal (RS) to the user equipment 200, and receive, from the user equipment 200, a power setting indication (PSI) , such that the user equipment 100 could save battery, perform long operation time, and/or have good operating performance from less interference. The user equipment 100 may be a user equipment for transmitting signals and the user equipment 200 may be a user equipment for receiving signals. In some embodiments, the wireless communication between the user equipment 100 and the user equipment 200 over the sidelink interface such as the PC5 interface could be based on 4th generation long term evolution (4G-LTE) or 5th generation new radio (5G-NR) radio access technology.

FIG. 1 further illustrates that, in some embodiments, the user equipment 200 for wireless communication includes a memory 202 and a processor 204 coupled to the memory 202. The processor 204 is configured to perform a wireless communication directly over a sidelink interface such as a PC5 interface with the user equipment 100, receive at least one data TB including at least one RS from the user equipment 100, calculate a reference signal received power (RSRP) level according to the at least one RS, derive the power setting indication according to the RSRP level, and transmit, to the user equipment 100, the power setting indication, such that the user equipment 100 could save battery, perform long operation time, and/or have good operating performance from less interference.

In some embodiments, the

memories

102 and 202 each may include read-only memory (ROM) , random access memory (RAM) , flash memory, memory card, storage medium and/or other storage device. The

processors

104 and 204 each may include application-specific integrated circuit (ASIC) , other chipset, logic circuit and/or data processing device. The

processors

104 and 204 each may also include baseband circuitry to process radio frequency signals. When the embodiments are implemented in software, the techniques described herein can be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described herein. The modules can be stored in

memories

102 and 202 and executed by

processors

104 and 204. The

memories

102 and 202 can be implemented within the

processors

104 and 204 or external to the

processors

104 and 204 in which case those can be communicatively coupled to the

processors

104 and 204 via various means as is known in the art.

In some embodiments, the at least one data TB includes at least one of a physical sidelink control channel (PSCCH) , a physical sidelink shared channel (PSSCH) , a physical sidelink broadcast channel (PSBCH) , a tracking RS, and a sidelink synchronization signal (SLSS) . The at least one RS is at least one demodulation reference signal (DMRS) for at least one of the PSCCH, the PSSCH, the PSBCH, the tracking RS, and the SLSS.

In some embodiments, the power setting indication is represented by one bit to provide two power setting indication values. In details, 0 means reducing power and 1 means increasing power, where amount of power to be reduced or increased is at a step of 1dB. In some embodiments, the power setting indication is represented by two bits to provide four power setting indication values. In details, 00 means no change of power, 01 means reducing power by 1dB, 10 means increasing power by 1dB, and 11 is reserved for next use. In some embodiments, the power setting indication is represented by three bits to provide eight power setting indication values. In details, 000 means no change of power, 001 means reducing power by 1dB, 010 means reducing power by 2dB, 011 means reducing power by 3dB, 100 is reserved for next use, 101 means increasing power by 1dB, 110 means increasing power by 2dB, and 111 means increasing power by 3dB.

FIG. 1 illustrates that, in some embodiments, the processor 104 is further configured to receive a network controlled transmission power control (TPC) command from the user equipment 200 and transmit a training RS using maximum power within the network controlled TPC command, such that even if the user equipment 200 is far from the user equipment 100, it is able to receive the training RS. In some embodiments, the at least one RS includes N consecutive RSs, where N is an integer greater than or equal to 1, and the RSRP level is calculated and averaged over the N consecutive RSs at the user equipment 200. N may range from greater than or equal to 1 to less than or equal to 10. In some embodiments, the power setting indication is derived separately or jointly for the PSCCH and the PSSCH to allow different power boosting levels between the PSCCH and the PSSCH. For example, power for the PSCCH of the user equipment 100 is greater than power for the PSSCH of the user equipment 100 to protect control channel.

In some embodiments, the processor 104 is further configured to receive at least one second data TB including at least one second RS from the user equipment 200, derive a second power setting indication according to the at least one second RS, and transmit, to the user equipment 200, the second power setting indication. The processor 104 is further configured to calculate a second RSRP level according to the at least one second RS and derive the second power setting indication according to the second RSRP level. The processor 104 is configured to periodically receive the at least one second RS and feed back the second power setting indication to the user equipment 200.

FIG. 2 illustrates that, in some embodiments, the communication between the user equipment 100 and the user equipment 200 relates to vehicle-to-everything (V2X) communication including vehicle-to-vehicle (V2V) , vehicle-to-pedestrian (V2P) , and vehicle-to-infrastructure/network (V2I/N) according to LTE sidelink technology developed under 3rd generation partnership project (3GPP) and/or 5G-NR radio access technology. The

user equipments

100 and 200 are communicated with each other directly via a sidelink interface such as a PC5 interface.

FIG 3 illustrates a method 300 of wireless communication according to the present disclosure, from an aspect of operation of the user equipment 100 for transmitting signals. The method 300 includes: at block 302, performing a wireless communication directly over a sidelink interface such as a PC 5 interface to the user equipment 200, at block 304, transmitting at least one data TB including at least one RS to the user equipment 200, and at block 306, receiving, from the user equipment 200, a power setting indication, such that the user equipment 100 could save battery, perform long operation time, and/or have good operating performance from less interference.

FIG. 4 illustrates a method 400 of wireless communication according to the present disclosure, from an aspect of operation of the user equipment 200 for receiving signals. The method 400 includes: at block 402, performing a wireless communication directly over a sidelink interface such as a PC 5 interface to the user equipment 100, at block 404, receiving at least one data TB including at least one RS from the user equipment 100, at block 406, calculating a RSRP level according to the at least one RS, at block 408, deriving a power setting indication according to the RSRP level, and at block 410, transmitting, to the user equipment 100, the power setting indication, such that the user equipment 100 could save battery, perform long operation time, and/or have good operating performance from less interference

FIG. 1 and FIGS. 5 to 7 illustrate that, in some embodiments, the user equipment 100 further includes at least one feedback channel 106. The processor 104 is configured to transmit, to the user equipment 200, the second power setting indication via the at least one feedback channel 106 such as a close-loop explicit power control/setting. A number of the at least one feedback channel 106 is at least two, a periodicity of the at least two feedback channels 106 is every 5, 10, 20, 50, or 100ms depending on carrier tone spacing. A size of the at least one feedback channel 106 is one slot in a time domain and at least one physical resource block (PRB) in a frequency domain. The at least one feedback channel 106 includes a guard period (GP) for transmission/reception switching, an orthogonal frequency division multiplexing (OFDM) symbol for receiving automatic gain control (AGC) , and a feedback data region including at least one of a DMRS resource element (RE) and an information resource element.

FIG. 1 and FIGS. 5 to 7 illustrate that, in some embodiments, the user equipment 200 further includes at least one feedback channel 206. The processor 204 is configured to transmit, to the user equipment 100, the power setting indication via the at least one feedback channel 206 such as a close-loop explicit power control/setting. A number of the at least one feedback channel 206 is at least two, a periodicity of the at least two feedback channels 206 is every 5, 10, 20, 50, or 100ms depending on carrier tone spacing. A size of the at least one feedback channel 206 is one slot in a time domain and at least one PRB in a frequency domain. The at least one feedback channel 206 includes a GP for transmission/reception switching, an OFDM symbol for receiving AGC, and a feedback data region including at least one of a DMRS RE and an information resource element.

FIG. 1 and FIG. 8 illustrate that, in some embodiments, the user equipment 100 further includes at least one sidelink control information (SCI) . The processor 104 is configured to encode the second power setting indication in the at least one SCI in the PSCCH. In some embodiments, the user equipment 200 further includes at least one SCI. The processor 204 is configured to encode the power setting indication in the at least one SCI in the PSCCH. In details, a parameter of the power setting indication (PSI) is field as part of the at least one SCI transported in the PSCCH, where a PSI feedback report of the user equipment 200 for the user equipment 100 is encoded in the SCI as part of scheduling assignment for the next data TB transmission to the user equipment 100.

FIG. 1 and FIG. 9 illustrate that, in some embodiments, the processor 104 is configured to schedule at least one SCI at a beginning of a transmission time interval (TTI) and assign a feedback region in an end of the TTI. The processor 104 is configured to receive, from the user equipment 200, the power setting indication via an upper layer medium access control control element (MAC-CE) carried in the PSSCH. In some embodiments, the processor 204 is configured to schedule at least one SCI at a beginning of a TTI and assign a feedback region in an end of the TTI. In some embodiments, the feedback region is assigned by the user equipment 100 and indicated to the user equipment 200 in the scheduling SCI at the beginning of a TTI. The feedback region includes a guard period (GP) of symbols for transmission/reception switching, a calculation of RSRP level, the power setting indication, an OFDM symbol for receiving AGC, and a feedback data region including at least one of a DMRS resource element and an information resource element. In some embodiments, the user equipment 200 is up on receiving an indication of feedback region assignment, calculates the RSRP level and prepares a PSI report to be fed back using the feedback region. The feedback region may not be assigned by the user equipment 100 in every sidelink TB transmission. Once the feedback region is assigned, the feedback region serves as a trigger for the user equipment 200 to feedback next PSI report.

A person having ordinary skill in the art understands that each of the units, algorithm, and steps described and disclosed in the embodiments of the present disclosure are realized using electronic hardware or combinations of software for computers and electronic hardware. Whether the functions run in hardware or software depends on the condition of application and design requirement for a technical plan. A person having ordinary skill in the art can use different ways to realize the function for each specific application while such realizations should not go beyond the scope of the present disclosure.

It is understood by a person having ordinary skill in the art that he/she can refer to the working processes of the system, device, and unit in the above-mentioned embodiment since the working processes of the above-mentioned system, device, and unit are basically the same. For easy description and simplicity, these working processes will not be detailed.

It is understood that the disclosed system, device, and method in the embodiments of the present disclosure can be realized with other ways. The above-mentioned embodiments are exemplary only. The division of the units is merely based on logical functions while other divisions exist in realization. It is possible that a plurality of units or components are combined or integrated in another system. It is also possible that some characteristics are omitted or skipped. On the other hand, the displayed or discussed mutual coupling, direct coupling, or communicative coupling operate through some ports, devices, or units whether indirectly or communicatively by ways of electrical, mechanical, or other kinds of forms.

The units as separating components for explanation are or are not physically separated. The units for display are or are not physical units, that is, located in one place or distributed on a plurality of network units. Some or all of the units are used according to the purposes of the embodiments.

Moreover, each of the functional units in each of the embodiments can be integrated in one processing unit, physically independent, or integrated in one processing unit with two or more than two units.

If the software function unit is realized and used and sold as a product, it can be stored in a readable storage medium in a computer. Based on this understanding, the technical plan proposed by the present disclosure can be essentially or partially realized as the form of a software product. Or, one part of the technical plan beneficial to the conventional technology can be realized as the form of a software product. The software product in the computer is stored in a storage medium, including a plurality of commands for a computational device (such as a personal computer, a server, or a network device) to run all or some of the steps disclosed by the embodiments of the present disclosure. The storage medium includes a USB disk, a mobile hard disk, a read-only memory (ROM) , a random access memory (RAM) , a floppy disk, or other kinds of media capable of storing program codes.

While the present disclosure has been described in connection with what is considered the most practical and preferred embodiments, it is understood that the present disclosure is not limited to the disclosed embodiments but is intended to cover various arrangements made without departing from the scope of the broadest interpretation of the appended claims.

Claims

A user equipment for wireless communication, comprising:

a memory; and

a processor coupled to the memory and configured to:

perform a wireless communication directly over a sidelink interface to a second user equipment;

transmit at least one data transport block comprising at least one reference signal to the second user equipment; and

receive, from the second user equipment, a power setting indication.
The user equipment of claim 1, wherein the at least one data transport block comprises at least one of a physical sidelink control channel (PSCCH) , a physical sidelink shared channel (PSSCH) , a physical sidelink broadcast channel (PSBCH) , a tracking reference signal, and a sidelink synchronization signal (SLSS) , wherein the at least one reference signal is at least one demodulation reference signal (DMRS) for at least one of the PSCCH, the PSSCH, the PSBCH, the tracking reference signal, and the SLSS.
The user equipment of claim 2, wherein the processor is further configured to receive a network controlled transmission power control (TPC) command and transmit a training reference signal using maximum power within the network controlled TPC command.
The user equipment of claim 1, wherein the power setting indication is derived separately or jointly for a PSCCH and a PSSCH to allow different power boosting levels between the PSCCH and the PSSCH.
The user equipment of claim 1, wherein the processor is further configured to:

receive at least one second data transport block comprising at least one second reference signal from the second user equipment;

derive a second power setting indication according to the at least one second reference signal; and

transmit, to the second user equipment, the second power setting indication.
The user equipment of claim 5, wherein the processor is further configured to:

calculate a reference signal received power (RSRP) level according to the at least one second reference signal; and

derive the second power setting indication according to the reference signal received power level.
The user equipment of claim 5, wherein the processor is configured to periodically receive the at least one second reference signal and feed back the second power setting indication to the second user equipment.
The user equipment of claim 5, further comprising at least one feedback channel, wherein the processor is configured to transmit, to the second user equipment, the second power setting indication via the at least one feedback channel.
The user equipment of claim 8, wherein a number of the at least one feedback channel is at least two, a periodicity of the at least two feedback channels is every 5, 10, 20, 50, or 100ms depending on carrier tone spacing.
The user equipment of claim 8, wherein a size of the at least one feedback channel is one slot in a time domain and at least one physical resource block in a frequency domain.
The user equipment of claim 8, wherein the at least one feedback channel comprises a guard period (GP) for transmission/reception switching, an orthogonal frequency division multiplexing (OFDM) symbol for receiving automatic gain control (AGC) , and a feedback data region comprising at least one of a DMRS resource element and an information resource element.
The user equipment of claim 8, further comprising at least one sidelink control information, wherein the processor is configured to encode the second power setting indication in the at least one sidelink control information in a PSCCH.
The user equipment of claim 1, wherein the processor is configured to schedule at least one sidelink control information at a beginning of a transmission time interval (TTI) and assign a feedback region in an end of the TTI.
The user equipment of claim 13, wherein the feedback region comprises a guard period (GP) of symbols for transmission/reception switching, a calculation of RSRP level, the power setting indication, an OFDM symbol for receiving AGC, and a feedback data region comprising at least one of a DMRS resource element and an information resource element.
The user equipment of claim 1, wherein the processor is configured to receive, from the second user equipment, the power setting indication via an upper layer medium access control control element (MAC-CE) carried in a PSSCH.
The user equipment of claim 1, wherein the power setting indication is represented by one bit to provide two power setting indication values.
The user equipment of claim 1, wherein the power setting indication is represented by two bits to provide four power setting indication values.
The user equipment of claim 1, wherein the power setting indication is represented by three bits to provide eight power setting indication values.
A user equipment for wireless communication, comprising:

a memory; and

a processor coupled to the memory and configured to:

perform a wireless communication directly over a sidelink interface to a second user equipment;

receive at least one data transport block comprising at least one reference signal from the second user equipment;

calculate a reference signal received power level according to the at least one reference signal;

derive a power setting indication according to the reference signal received power level; and

transmit, to the second user equipment, the power setting indication.
The user equipment of claim 19, wherein the at least one data transport block comprises at least one of a physical sidelink control channel (PSCCH) , a physical sidelink shared channel (PSSCH) , a physical sidelink broadcast channel (PSBCH) , a tracking reference signal, and a sidelink synchronization signal (SLSS) , wherein the at least one reference signal is at least one demodulation reference signal (DMRS) for at least one of the PSCCH, the PSSCH, the PSBCH, the tracking reference signal, and the SLSS.
The user equipment of claim 19, wherein the power setting indication is derived separately or jointly for a PSCCH and a PSSCH to allow different power boosting levels between the PSCCH and the PSSCH.
The user equipment of claim 19, wherein the processor is further configured to:

transmit at least one second data transport block comprising at least one second reference signal to the second user equipment; and

receive, from the second user equipment, a second power setting indication.
The user equipment of claim 19, further comprising at least one feedback channel, wherein the processor is configured to transmit, to the second user equipment, the power setting indication via the at least one feedback channel.
The user equipment of claim 23, wherein a number of the at least one feedback channel is at least two, a periodicity of the at least two feedback channels is every 5, 10, 20, 50, or 100ms depending on carrier tone spacing.
The user equipment of claim 23, wherein a size of the at least one feedback channel is one slot in a time domain and at least one physical resource block in a frequency domain.
The user equipment of claim 23, wherein the at least one feedback channel comprises a guard period (GP) for transmission/reception switching, an orthogonal frequency division multiplexing (OFDM) symbol for receiving automatic gain control (AGC) , and a feedback data region comprising at least one of a DMRS resource element and an information resource element.
The user equipment of claim 19, further comprising at least one sidelink control information, wherein the processor is configured to encode the power setting indication in the at least one sidelink control information in a PSCCH.
The user equipment of claim 19, wherein the processor is configured to schedule at least one sidelink control information at a beginning of a transmission time interval (TTI) and assign a feedback region in an end of the TTI.
The user equipment of claim 28, wherein the feedback region comprises a guard period (GP) of symbols for transmission/reception switching, a calculation of RSRP level, the power setting indication, an OFDM symbol for receiving AGC, and a feedback data region comprising at least one of a DMRS resource element and an information resource element.
The user equipment of claim 19, wherein the processor is configured to transmit the power setting indication to the second user equipment via an upper layer medium access control control element (MAC-CE) carried in a PSSCH.
The user equipment of claim 19, wherein the power setting indication is represented by one bit to provide two power setting indication values.
The user equipment of claim 19, wherein the power setting indication is represented by two bits to provide four power setting indication values.
The user equipment of claim 19, wherein the power setting indication is represented by three bits to provide eight power setting indication values.
A method of wireless communication of a user equipment, comprising:

performing a wireless communication directly over a sidelink interface to a second user equipment;

transmitting at least one data transport block comprising at least one reference signal to the second user equipment; and

receiving, from the second user equipment, a power setting indication.
The method of claim 34, wherein the at least one data transport block comprises at least one of a physical sidelink control channel (PSCCH) , a physical sidelink shared channel (PSSCH) , a physical sidelink broadcast channel (PSBCH) , a tracking reference signal, and a sidelink synchronization signal (SLSS) , wherein the at least one reference signal is at least one demodulation reference signal (DMRS) for at least one of the PSCCH, the PSSCH, the PSBCH, the tracking reference signal, and the SLSS.
The method of claim 35, further comprising receiving a network controlled transmission power control (TPC) command and transmitting a training reference signal using maximum power within the network controlled TPC command.
The method of claim 34, further comprising:

receiving at least one second data transport block comprising at least one second reference signal from the second user equipment;

deriving a second power setting indication according to the at least one second reference signal; and

transmitting, to the second user equipment, the second power setting indication.
The method of claim 37, further comprising:

calculating a reference signal received power (RSRP) level according to the at least one second reference signal; and

deriving the second power setting indication according to the reference signal received power level.
The method of claim 37, further comprising periodically receiving the at least one second reference signal and feeding back the second power setting indication to the second user equipment.
The method of claim 37, further comprising transmitting, to the second user equipment, the second power setting indication via at least one feedback channel.
The method of claim 40, wherein a number of the at least one feedback channel is at least two, a periodicity of the at least two feedback channels is every 5, 10, 20, 50, or 100ms depending on carrier tone spacing.
The method of claim 40, wherein a size of the at least one feedback channel is one slot in a time domain and at least one physical resource block in a frequency domain.
The method of claim 40, wherein the at least one feedback channel comprises a guard period (GP) for transmission/reception switching, an orthogonal frequency division multiplexing (OFDM) symbol for receiving automatic gain control (AGC) , and a feedback data region comprising at least one of a DMRS resource element and an information resource element.
The method of claim 40, further comprising encoding the second power setting indication in at least one sidelink control information in a PSCCH.
The method of claim 34, further comprising scheduling at least one sidelink control information at a beginning of a transmission time interval (TTI) and assigning a feedback region in an end of the TTI.
The method of claim 45, wherein the feedback region comprises a guard period (GP) of symbols for transmission/reception switching, a calculation of RSRP level, the power setting indication, an OFDM symbol for receiving AGC, and a feedback data region comprising at least one of a DMRS resource element and an information resource element.
The method of claim 34, further comprising receiving, from the second user equipment, the power setting indication via an upper layer medium access control control element (MAC-CE) carried in a PSSCH.
The method of claim 34, wherein the power setting indication is represented by one bit to provide two power setting indication values.
The method of claim 34, wherein the power setting indication is represented by two bits to provide four power setting indication values.
The method of claim 34, wherein the power setting indication is represented by three bits to provide eight power setting indication values.
A method of wireless communication of a user equipment, comprising:

performing a wireless communication directly over a sidelink interface to a second user equipment;

receiving at least one data transport block comprising at least one reference signal from the second user equipment;

calculating a reference signal received power level according to the at least one reference signal;

deriving a power setting indication according to the reference signal received power level; and

transmitting, to the second user equipment, the power setting indication.
The method of claim 51, wherein the at least one data transport block comprises at least one of a physical sidelink control channel (PSCCH) , a physical sidelink shared channel (PSSCH) , a physical sidelink broadcast channel (PSBCH) , a tracking reference signal, and a sidelink synchronization signal (SLSS) , wherein the at least one reference signal is at least one demodulation reference signal (DMRS) for at least one of the PSCCH, the PSSCH, the PSBCH, the tracking reference signal, and the SLSS.
The method of claim 51, further comprising separately or jointly deriving the power setting indication for a PSCCH and a PSSCH to allow different power boosting levels between the PSCCH and the PSSCH.
The method of claim 51, further comprising:

transmitting at least one second data transport block comprising at least one second reference signal to the second user equipment; and

receiving, from the second user equipment, a second power setting indication.
The method of claim 51, further comprising transmitting, to the second user equipment, the power setting indication via at least one feedback channel.
The method of claim 55, wherein a number of the at least one feedback channel is at least two, a periodicity of the at least two feedback channels is every 5, 10, 20, 50, or 100ms depending on carrier tone spacing.
The method of claim 55, wherein a size of the at least one feedback channel is one slot in a time domain and at least one physical resource block in a frequency domain.
The method of claim 55, wherein the at least one feedback channel comprises a guard period (GP) for transmission/reception switching, an orthogonal frequency division multiplexing (OFDM) symbol for receiving automatic gain control (AGC) , and a feedback data region comprising at least one of a DMRS resource element and an information resource element.
The method of claim 51, further comprising encoding the power setting indication in at least one sidelink control information in a PSCCH.
The method of claim 51, further comprising scheduling at least one sidelink control information at a beginning of a transmission time interval (TTI) and assign a feedback region in an end of the TTI.
The method of claim 60, wherein the feedback region comprises a guard period (GP) of symbols for transmission/reception switching, a calculation of RSRP level, the power setting indication, an OFDM symbol for receiving AGC, and a feedback data region comprising at least one of a DMRS resource element and an information resource element.
The method of claim 51, further comprising transmitting the power setting indication to the second user equipment via an upper layer medium access control control element (MAC-CE) carried in a PSSCH.
The method of claim 51, wherein the power setting indication is represented by one bit to provide two power setting indication values.
The method of claim 51, wherein the power setting indication is represented by two bits to provide four power setting indication values.
The method of claim 51, wherein the power setting indication is represented by three bits to provide eight power setting indication values.