CN112740787B

CN112740787B - User equipment and wireless communication method thereof

Info

Publication number: CN112740787B
Application number: CN201880097893.2A
Authority: CN
Inventors: 林晖闵; 赵振山; 卢前溪
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2018-11-01
Filing date: 2018-11-01
Publication date: 2023-08-18
Anticipated expiration: 2038-11-01
Also published as: CN112740787A; WO2020087444A1

Abstract

User equipment and methods of wireless communication thereof are provided. The method includes allocating and reserving a transmission power reservation level to guarantee a minimum level of X% of a total configured maximum output power of a user equipment for a first side-link (SL) vehicle over a first Radio Access Technology (RAT) transmission to an outside world (V2X), and allocating a transmission power level up to a maximum level of (100-X)% of the total configured maximum output power of the user equipment for each second SL V2X transmission over a second RAT, wherein X is greater than 0 and less than 100.

Description

User equipment and wireless communication method thereof

Technical Field

The present disclosure relates to the field of communication systems, and in particular, to a user equipment and a method of wireless communication thereof.

Background

As part of the evaluation of the direct vehicle-to-exterior (V2X) communication being developed by the third generation partnership project (3 GPP), the next generation V2X technology (i.e., NR-V2X) based on the recently developed fifth generation-new air interface (5G-NR) system needs to support additional advanced Intelligent Transport System (ITS) applications and services as compared to the existing long term evolution V2X (LTE-V2X) based technology. As such, new V2X User Equipment (UE) is therefore required to be able to operate on both LTE-V2X and NR-V2X Radio Access Technologies (RATs) simultaneously.

Because there is a maximum output power level (P) configured by the UE for the total available transmission (Tx) power of the UE _CMAX ) For this reason, at any given point in time, the UE should not transmit at a combined power level exceeding this limit, regardless of the number of side-uplink (SL) channels, signals, frequency carriers, and RATs that the UE is transmitting, so when the SL transmissions of LTE-V2X and NR-V2X overlap in time, the new V2X UE will need to share its total available Tx power between LTE-V2X and NR-V2X.

Disclosure of Invention

It is an object of the present disclosure to propose a user equipment and a method of wireless communication thereof, which are capable of providing the following aspects: vehicles on higher priority Radio Access Technologies (RATs) are protected from outside (V2X) transmissions, e.g., long term evolution V2X (LTE-V2X) or new air interface V2X (NR-V2X), and/or additional transmission (Tx) power may be allocated to higher priority RATs when available.

In a first aspect of the present disclosure, a user equipment for wireless communication includes a memory, a transceiver, and a processor coupled to the memory and the transceiver. The processor is configured to allocate and reserve a transmission power reservation level for a first side-link (SL) vehicle-to-outside (V2X) transmission on a first Radio Access Technology (RAT) to guarantee a minimum level of X% of a total configured maximum output power of the user equipment. The processor is configured to allocate a transmission power level for a second SL V2X transmission on the second RAT of a maximum level of (100-X)% up to a total configured maximum output power of the user equipment. X is greater than 0 and less than 100.

According to an embodiment in combination with the first aspect of the present disclosure, the transmission power reservation level for the first SL V2X transmission is predetermined, preconfigured, or configured by the network base station.

According to an embodiment in combination with the first aspect of the present disclosure, during a first non-overlapping period of a first SL V2X transmission on a first RAT, the transmission power of the user equipment is X% of the total configured maximum output power of the user equipment.

According to an embodiment in combination with the first aspect of the present disclosure, the combined transmission power of the user equipment during the overlapping time period of simultaneous first SL V2X transmission on the first RAT and second SL V2X transmission on the second RAT is equal to 100% of the total configured maximum output power of the user equipment.

According to an embodiment in combination with the first aspect of the present disclosure, during a second non-overlapping period of a second SL V2X transmission on a second RAT, the transmission power of the user equipment is (100-X)% of the total configured maximum output power of the user equipment.

According to embodiments in combination with the first aspect of the present disclosure, there is coordination of V2X operation on the first RAT and the second RAT, or information about SL scheduling, transmission timing and/or transmission power allocation or usage of one of the first RAT and the second RAT is known to the other of the first RAT and the second RAT.

According to an embodiment in combination with the first aspect of the present disclosure, when the transmission power of the user equipment during the second SL V2X transmission on the second RAT is less than (100-X)% of the total configured maximum output power of the user equipment, the processor is configured to allocate the transmission power of the user equipment during the first SL V2X transmission on the first RAT which is greater than X% of the total configured maximum output power of the user equipment.

According to embodiments in combination with the first aspect of the present disclosure, there is no coordination of V2X operation on the first RAT and the second RAT, or information about SL scheduling, transmission timing and/or transmission power allocation or usage of one of the first RAT and the second RAT is not shared with the other of the first RAT and the second RAT.

According to an embodiment in combination with the first aspect of the present disclosure, the processor is configured to select to increase the transmission power of the user equipment on the first RAT beyond the transmission power reservation level.

According to an embodiment in combination with the first aspect of the present disclosure, during an overlapping period of simultaneous first SL V2X transmission on the first RAT and second SL V2X transmission on the second RAT, if the combined transmission power of the user equipment is greater than 100% of the total configured maximum output power of the user equipment, the processor reduces at least one of the transmission powers of the user equipment on the first RAT and the second RAT such that the combined transmission power of the user equipment is adjusted to be less than or equal to 100% of the total configured maximum output power of the user equipment.

According to an embodiment in combination with the first aspect of the present disclosure, the processor reduces the transmission power of the user equipment on one of the first RAT and the second RAT, the priority of the one RAT being lower than the priority of the other of the first RAT and the second RAT.

According to an embodiment in combination with the first aspect of the present disclosure, the processor reduces the transmission power of the user equipment on the first RAT and the second RAT equally.

According to an embodiment in combination with the first aspect of the present disclosure, the first RAT and the second RAT are different.

According to an embodiment in combination with the first aspect of the present disclosure, one of the first RAT and the second RAT is long term evolution V2X (LTE-V2X), and the other of the first RAT and the second RAT is new air interface V2X (NR-V2X).

In a second aspect of the present disclosure, a method of wireless communication of a user equipment includes: a transmission power reservation level is allocated and reserved for a first side-link (SL) vehicle on a first Radio Access Technology (RAT) for outside (V2X) transmissions to ensure a minimum level of X% of a total configured maximum output power of the user equipment. The method comprises the following steps: a transmission power level of a maximum level of (100-X)% up to a total configured maximum output power of the user equipment is allocated for a second SL V2X transmission on the second RAT. X is greater than 0 and less than 100.

According to an embodiment in combination with the second aspect of the present disclosure, the transmission power reservation level for the first SL V2X transmission is predefined, preconfigured, or configured by the network base station.

According to an embodiment in combination with the second aspect of the present disclosure, during a first non-overlapping period of a first SL V2X transmission on a first RAT, the transmission power of the user equipment is X% of the total configured maximum output power of the user equipment.

According to an embodiment in combination with the second aspect of the present disclosure, the combined transmission power of the user equipment during the overlapping period of time when the first SL V2X transmission is performed on the first RAT and the second SL V2X transmission is performed on the second RAT simultaneously is equal to 100% of the total configured maximum output power of the user equipment.

According to an embodiment in combination with the second aspect of the present disclosure, during a second non-overlapping period of a second SL V2X transmission on a second RAT, the transmission power of the user equipment is (100-X)% of the total configured maximum output power of the user equipment.

According to embodiments incorporating the second aspect of the present disclosure, there is coordination of V2X operation on the first RAT and the second RAT, or information about SL scheduling, transmission timing and/or transmission power allocation or usage of one of the first RAT and the second RAT is known to the other of the first RAT and the second RAT.

According to an embodiment in combination with the second aspect of the present disclosure, when the transmission power of the user equipment during the second SL V2X transmission on the second RAT is less than (100-X)% of the total configured maximum output power of the user equipment, the method further comprises: during a first SL V2X transmission on a first RAT, a transmission power of the user equipment is allocated that is greater than X% of a total configured maximum output power of the user equipment.

According to embodiments incorporating the second aspect of the present disclosure, there is no coordination of V2X operation on the first and second RATs, or information about SL scheduling, transmission timing and/or transmission power allocation or usage of one of the first and second RATs is not shared with the other of the first and second RATs.

According to an embodiment in combination with the second aspect of the present disclosure, the method further comprises: the transmission power of the user equipment on the first RAT is selected to be increased beyond the transmission power reservation level.

According to an embodiment in combination with the second aspect of the present disclosure, during an overlapping period of time when the first SL V2X transmission is performed on the first RAT and the second SL V2X transmission is performed on the second RAT, if the combined transmission power of the user equipment is greater than 100% of the total configured maximum output power of the user equipment, the method further comprises: at least one of the transmission powers of the user equipment on the first RAT and the second RAT is reduced such that the combined transmission power of the user equipment is adjusted to be less than or equal to 100% of the total configured maximum output power of the user equipment.

According to an embodiment in combination with the second aspect of the present disclosure, the method further comprises: the transmission power of the user equipment on one of the first RAT and the second RAT is reduced, the priority of the one RAT being lower than the priority of the other of the first RAT and the second RAT.

According to an embodiment in combination with the second aspect of the present disclosure, the method further comprises: the transmission power of the user equipment on the first RAT and the second RAT is reduced equally.

According to an embodiment in combination with the second aspect of the present disclosure, the first RAT and the second RAT are different.

According to an embodiment in combination with the second aspect of the present disclosure, one of the first RAT and the second RAT is long term evolution V2X (LTE-V2X), and the other of the first RAT and the second RAT is new air interface V2X (NR-V2X).

In a third aspect of the present disclosure, a non-transitory machine-readable storage medium has stored thereon instructions that, when executed by a computer, cause the computer to perform the above-described method.

In a fourth aspect of the present disclosure, a terminal device includes a processor and a memory configured to store a computer program. The processor is configured to execute a computer program stored in the memory to perform the above-described method.

In embodiments of the present disclosure, a user equipment and a method of wireless communication thereof are directed to ensuring that a minimum guaranteed power is available for transmission of a side uplink (SL) channel and/or signal on one of two RATs and that more transmission (Tx) power can be allocated at the same time if there is no overlapping transmission or there is remaining power not used by the other RAT. To achieve this, it is proposed to reserve a minimum Tx power for one of the RATs (e.g. LTE-V2X or NR-V2X). Embodiments of the present disclosure have at least one of the following benefits.

1. Ensure that SL transmissions on high priority RATs (LTE-V2X or NR-V2X) are protected and have a sufficient amount of power allocated for basic V2X transmissions.

2. When there is no overlapping transmission or there is remaining power unused by the lower priority RATs, it is ensured that more Tx power can be allocated for SL transmissions on the high priority RATs (LTE-V2X or NR-V2X).

Drawings

In order to more clearly illustrate the embodiments of the present disclosure or related art, the following drawings, which will be described in the embodiments, are briefly introduced. It is evident that the drawings are merely some embodiments of the present disclosure from which one of ordinary skill in the art could obtain other drawings without paying attention.

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 flowchart illustrating a method of wireless communication of a user device according to an embodiment of the present disclosure.

Fig. 3 is a schematic diagram of an exemplary illustration of a User Equipment (UE) power sharing scheme based on allocating guaranteed reserved power for side-link (SL) transmissions in a high priority Radio Access Technology (RAT) according to an embodiment of the present disclosure.

Fig. 4 is a P with a static or quasi-static allocation of reserved transmission (Tx) power in accordance with an embodiment of the present disclosure _{RAT_1} And P _{RAT_2} Schematic diagram of an exemplary illustration of coordinated power sharing therebetween.

FIG. 5 is a P in accordance with an embodiment of the present disclosure _{RAT_1} And P _{RAT_2} Schematic diagram of an exemplary illustration of uncoordinated power sharing with opportunistic power boosting and power adjustment.

Fig. 6 is a block diagram of a system for wireless communication according to an embodiment of the present disclosure.

Detailed Description

The technical contents, structural features, achieved objects and effects of the embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. In particular, the terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Fig. 1 illustrates that in some embodiments, a User Equipment (UE) 10 for wireless communication may include a processor 11, a memory 12, and a transceiver 13. The processor 11 may be configured to implement the proposed functions, programs and/or methods described in the present description. Layers of the radio interface protocol may be implemented in the processor 11. The memory 12 is operatively coupled to the processor 11 and stores various information to operate the processor 11. The transceiver 13 is operatively coupled to the processor 11 and transmits and/or receives radio signals.

The processor 11 may include an Application Specific Integrated Circuit (ASIC), other chipset, logic circuit, and/or data processing device. Memory 12 may include Read Only Memory (ROM), random Access Memory (RAM), flash memory, memory cards, storage media, and/or other storage devices. The transceiver 13 may include baseband circuitry for processing radio frequency signals. When the embodiments are implemented in software, the techniques described herein may be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described herein. These modules may be stored in the memory 12 and executed by the processor 11. The memory 12 may be implemented within the processor 11 or external to the processor 11, in which case it can be communicatively coupled to the processor 11 via various means as is known in the art.

According to the side-link technology developed under the third generation partnership project (3 GPP) new air interface (NR) release 16 and beyond, communication between UEs involves vehicle-to-outside (V2X) communication including vehicle-to-vehicle (V2V), vehicle-to-pedestrian (V2P), and vehicle-to-infrastructure/network (V2I/N). UEs communicate directly with each other through a side-link interface, such as a PC5 interface.

In some embodiments, the processor 11 is configured to allocate and reserve a transmission power reservation level for a first side-link (SL) vehicle on a first Radio Access Technology (RAT) for an outside world (V2X) transmission to guarantee a minimum level of X% of the total configured maximum output power of the user equipment 10. The processor 11 is configured to allocate a transmission power level for the second SL V2X transmission on the second RAT of a maximum level of up to (100-X)% of the total configured maximum output power of the user equipment 10. X is greater than 0 and less than 100.

Fig. 2 illustrates a method 400 of wireless communication of a UE 10 in accordance with an embodiment of the present disclosure.

The method 400 includes: at block 402, a transmission power reservation level is allocated and reserved for a first side-link (SL) vehicle over a first Radio Access Technology (RAT) transmission to the outside world (V2X) to guarantee a minimum level of X% of the total configured maximum output power of the user equipment 10, and at block 404, a transmission power level up to a maximum level of (100-X)% of the total configured maximum output power of the user equipment 10 is allocated for a second SL V2X transmission over a second RAT, where X is greater than 0 and less than 100.

In an embodiment of the present disclosure, the method 400 of communication of the UE 10 and its vehicle to the outside world (V2X) provides: vehicles on higher priority Radio Access Technologies (RATs) are protected from outside (V2X) transmissions, e.g., long term evolution V2X (LTE-V2X) or new air interface V2X (NR-V2X), and/or additional transmission (Tx) power may be allocated to higher priority RATs when available.

In some embodiments, a transmission (Tx) power reservation scheme is proposed for a UE 10 to perform V2X operations (i.e., LTE-V2X and NR-V2X) simultaneously on two different Radio Access Technologies (RATs), transmitting side uplink (SL) channels and/or signals over multiple carriers to one or more receiving UEs (Rx-UE) configured to receive signals, a total configured maximum output power (P) of the UEs _CMAX ) Reserved power allocation based on guarantees to one of the RATs is shared statically or quasi-statically between LTE-V2X and NR-V2X operations. When the UE 10 is network configured, preconfigured or programmed with a predetermined reserved transmission (Tx) power level (e.g., P) for one radio access technology (e.g., rat_1 in fig. 3) _CMAX Is the minimum guaranteed UE Tx power allocation for all SL transmissions of that RAT at any time, regardless of whether the SL transmissions overlap in time with another RAT (e.g., rat_2 in fig. 3) or not). That is, as long as needed, it is guaranteed that RAT_1 can use up to reserved P _CMAX X% of (c). Meanwhile, if SL transmission needs to be less than X%, then such as configured toThe UE 10 transmitting the signal transmitting UE (Tx-UE) is allowed to allocate less Tx power for rat_1. However, in this case, even though the Tx-UE has been allocated less than P for SL transmission in RAT_1 _CMAX The Tx-UE still only allocates up to P for SL transmissions in rat_2 at any given point in time _CMAX (100-X)%. For example, assuming that the SL transmission in rat_1 only requires 30% of the total configured maximum output power of the UE, another SL transmission in rat_2 that overlaps in time with the SL transmission of rat_1 requires 40%, then the total combined Tx power during the overlapping portion of the two SL transmissions will be P only _CMAX 70% of (C).

Referring to fig. 3, the principle of Tx power sharing of the guarantee-based reserved power allocation scheme 100 for two RATs (i.e., rat_1 and rat_2) is exemplarily shown. For all SL transmissions on rat_1, a network configured, pre-configured or predetermined reserved Tx power of X% of the total configured output power of the UE has been allocated for Tx-UE, and SL transmission 101 on rat_1 overlaps with SL transmission 102 on rat_2. Since P has been allocated and reserved for SL transmission 101 on RAT_1 _CMAX X% of (2), so that the SL transmission 102 on rat_2 can only get P at most _CMAX (100-X)%. Thus, during the first non-overlapping period 103, the Tx-UE may allocate at least P for the SL transmission 101 on rat_1 _CMAX X%106 of (c). During the overlapping period 104 of SL transmissions 101 and 102 on both rat_1 and rat_2, the combined UE Tx power 107 will be (x+ (100-X))% = 100%. For the second non-overlapping period 105 of the rest of the SL transmission on rat_2, the ue Tx power will be P only _CMAX (100-X)% 108.

For the case when V2X operation in a RAT is able to coordinate or consider information about Tx scheduling, synchronization timing and/or Tx power allocation for V2X operation in another RAT, the Tx-UE may allocate more Tx power for SL transmission on the RAT with a predetermined or (pre) configured reserved power based on the information. However, the Tx-UE is not allowed to allocate more than (100-X)% of the Tx output power for SL transmission on RATs without a predetermined or (pre) configured reserved power. This is to ensure that the minimum guaranteed amount of UE Tx power can always be provided to the RAT allocated with reserved power. Example(s)For example, if the Tx-UE knows in advance that it will not overlap in time with any SL transmission on another RAT, the Tx-UE may have assigned P _CMAX SL transmissions on 60% (i.e., reserved power) RATs are allocated additional max P _CMAX 40% of (C). However, the Tx-UE can only allocate up to P for SL transmissions on RATs without a predetermined or (pre) configured reserved power _CMAX 40% of (a) even if there is no and P has been allocated _CMAX Overlapping transmissions of 60% (i.e., reserved power) RATs.

Referring to fig. 4, a UE transmission power (P) for rat_1 in a reserved power allocation scheme 200 is exemplarily shown _RAT-1 ) And the UE transmission power (P) of rat_2 _RAT-2 ) Coordinated power sharing among, where P _CMAX Is predetermined or (pre) configured for SL transmission on rat_1. If the Tx-UE is able to coordinate SL transmission timing and Tx power allocation on both rat_1 and rat_2, then for simultaneous overlapping rat_1SL transmission and rat_2SL transmission, the SL transmission on rat_2 need only be used for P _RAT-2 P of (2) _CMAX At 30%203 of (2), the Tx-UE may be other than P _CMAX 60% (i.e. for P) _RAT-1 Reserved power 204) of (2) is allocated P) beyond _CMAX 10% of the power, i.e. P _CMAX A level 206 of 70% of the total combination. For P _RAT-2 P of (2) _CMAX A maximum level 202 of 40% of (c) is shown in fig. 4.

For the case when V2X operation in a RAT cannot coordinate or is not aware of scheduling information, tx timing and/or Tx power allocation of V2X operation in another RAT, the Tx-UE may always allocate Tx power of its Tx power according to and within a predetermined or (pre) configured reservation level or opportunistically boost and/or allocate more Tx power than the predetermined or (pre) configured reservation level. If the Tx power on one RAT is boosted due to opportunistic sense and the combined Tx power of overlapping SL transmissions on both rat_1 and rat_2 at any given point in time is greater than P _CMAX 100% of (a), then final Tx powers of rat_1 and rat_2 (e.g., P _RAT-1 And P _RAT-2 ) The adjustment may be based on a fixed RAT priority or equivalent reduction method.

Referring to fig. 5, the UE Tx power (P) of rat_1 is exemplarily shown in scheme 300 _RAT-1 ) And UE Tx power of rat_2 (P _RAT-2 ) Wherein RATs with a predetermined or (pre) configured reservation level are power boosted, wherein P is predetermined or (pre) configured for SL transmission on rat_1 _CMAX Is a reserved power level 301 of 60%. Due to the reserved power for the predetermined or (pre) configuration of rat_1, P may be _RAT-2 The maximum Tx power allocated is P _CMAX 40% of (C). For the example shown in scheme 300, because there is no coordination of UE Tx power between rat_1 and rat_2 and no knowledge about Tx scheduling, tx timing, and/or Tx power allocation between RATs, tx-UE may choose to increase (e.g., opportunistic boosting) Tx power on RATs with a predetermined or (pre) configured reservation level (i.e., rat_1). In this case, in addition to P _CMAX Outside of the 60% reservation level 301, the amount of opportunistic boost is P _CMAX Is greater than 20%304. Thus, the total initial power 302 allocated to SL transmission on RAT_1 is P _CMAX 80% of (C). Suppose there is an overlapping SL transmission on rat_2 and the Tx-UE allocates P for this transmission _CMAX 30% of the initial power 303. Thus, due to the uncoordinated nature of Tx power allocation between two RATs, the initial combined Tx power is P _CMAX Which exceeds the upper limit of the UE requirements. In this case, further adjustment of UE Tx power is required.

In a first adjustment scheme 310, which is a fixed RAT priority based approach, rat_1 has a higher priority. Thus, P _RAT-1 Hold with previous P _CMAX Is the same as 80%311, P _RAT-2 Is adjusted and reduced to P _CMAX 20%312 of (b) such that the total combined Tx power does not exceed P _CMAX 100% of (3).

In the second adjustment scheme 320, which is also a fixed RAT priority based method, rat_2 has a higher priority. Thus, P _RAT-2 Hold with previous P _CMAX Is the same as 30%322, P _RAT-1 Is adjusted and reduced to P _CMAX 70%321 of (a) such that the total combined Tx power does not exceed P _CMAX 100% of (3).

In a third adjustment scheme 330, which is based on an equal reduction approach, P _RAT-1 And P _RAT-2 Is equally reduced by the same amount so that the total combined Tx power does not exceed P _CMAX 100% of (3). In the example shown in scheme 330, P _RAT-1 From P _CMAX 80% of (C) is reduced to 75%331, P _RAT-2 Slave P _CMAX Is reduced to 25%332.

Fig. 6 is a block diagram of an example system 700 for wireless communication according to an embodiment of the disclosure. The embodiments described herein may be implemented into a system using any suitably configured hardware and/or software. Fig. 6 illustrates a system 700, the system 700 comprising Radio Frequency (RF) circuitry 710, baseband circuitry 720, application circuitry 730, memory/storage 740, display 750, camera 760, sensor 770, and input/output (I/O) interface 780 coupled to one another at least as shown.

Application circuitry 730 may include circuitry such as, but not limited to, one or more single-core or multi-core processors. A processor may include any combination of general-purpose and special-purpose processors (e.g., graphics processors and application processors). The processor may be coupled with the memory/storage device and configured to execute instructions stored in the memory/storage device to enable various application programs and/or an operating system to run on the system.

Baseband circuitry 720 may include circuitry such as, but not limited to, one or more single-core or multi-core processors. The processor may comprise a baseband processor. The baseband circuitry may handle various wireless control functions that enable communication with one or more wireless networks via the RF circuitry. The wireless control functions may include, but are not limited to, signal modulation, encoding, decoding, radio frequency shifting, and the like. In some embodiments, the baseband circuitry may provide communications compatible with one or more wireless technologies. For example, in some embodiments, the baseband circuitry may support communication with an Evolved Universal Terrestrial Radio Access Network (EUTRAN) and/or other Wireless Metropolitan Area Networks (WMANs), wireless Local Area Networks (WLANs), wireless Personal Area Networks (WPANs). An embodiment in which the baseband circuitry is configured to support wireless communications for more than one wireless protocol may be referred to as a multi-mode baseband circuitry.

In various embodiments, baseband circuitry 720 may include circuitry to operate with signals that are not strictly considered to be in baseband frequency. For example, in some embodiments, the baseband circuitry may include circuitry to operate with signals having an intermediate frequency between the baseband frequency and the radio frequency.

RF circuitry 710 may enable communication with a wireless network through a non-solid medium using modulated electromagnetic radiation. In various embodiments, the RF circuitry may include switches, filters, amplifiers, and the like to facilitate communication with the wireless network.

In various embodiments, RF circuitry 710 may include circuitry for operating with signals that are not strictly considered to be at radio frequencies. For example, in some embodiments, the baseband circuitry may include circuitry to operate with signals having an intermediate frequency between the baseband frequency and the radio frequency.

In various embodiments, the transmitter circuitry, control circuitry, or receiver circuitry discussed above with respect to the user equipment, eNB, or gNB may be implemented, in whole or in part, in one or more of RF circuitry, baseband circuitry, and/or application circuitry. As used herein, "circuitry" may refer to, be part of, or include the following: an Application Specific Integrated Circuit (ASIC), an electronic circuit executing one or more software or firmware programs, a processor (shared, dedicated, or group) and/or memory (shared, dedicated, or group), a combinational logic circuit, and/or other suitable hardware components that provide the described functionality. In some embodiments, the electronic device circuitry may be implemented by one or more software or firmware modules, or the functionality associated with the circuitry may be implemented by one or more software or firmware modules.

In some embodiments, some or all of the constituent components of the baseband circuitry, application circuitry, and/or memory/storage may be implemented together on a system on a chip (SOC).

Memory/storage 740 may be used to load and store data and/or instructions, for example, for the system. The memory/storage of an embodiment may include any combination of suitable volatile memory (e.g., dynamic Random Access Memory (DRAM)) and/or non-volatile memory (e.g., flash memory).

In various embodiments, the I/O interface 780 may include one or more user interfaces designed to enable a user to interact with the system and/or peripheral component interfaces designed to enable peripheral components to interact with the system. The user interface may include, but is not limited to, a physical keyboard or keypad, a touchpad, a speaker, a microphone, and the like. Peripheral component interfaces may include, but are not limited to, non-volatile memory ports, universal Serial Bus (USB) ports, audio jacks, and power interfaces.

In various embodiments, the sensor 770 may comprise one or more sensing devices for determining environmental conditions and/or location information related to the system. In some embodiments, the sensors may include, but are not limited to, gyroscopic sensors, accelerometers, proximity sensors, ambient light sensors, and positioning units. The positioning unit may also be part of or interact with baseband circuitry and/or RF circuitry to communicate with components of a positioning network, such as Global Positioning System (GPS) satellites.

In various embodiments, display 750 may include displays such as liquid crystal displays and touch screen displays. In various embodiments, system 700 may be a mobile computing device such as, but not limited to, a laptop computing device, a tablet computing device, a netbook, a superbook, a smartphone, and the like. In various embodiments, the system may have more or fewer components and/or different architectures. The methods described herein may be implemented as computer programs, where appropriate. The computer program may be stored on a storage medium such as a non-transitory storage medium.

In embodiments of the present disclosure, a user equipment and a method of wireless communication thereof are directed to ensuring that a minimum guaranteed power is available for transmitting a side uplink (SL) channel and/or signal on one of two RATs and, at the same time, more transmission (Tx) power can be allocated if there is no overlapping transmission or there is remaining power not used by the other RAT. To achieve this, it is proposed to reserve a minimum Tx power for one of the RATs (e.g. LTE-V2X or NR-V2X). Embodiments of the present disclosure are a combination of techniques/procedures that may be employed in 3GPP specifications to create end products. Embodiments of the present disclosure have at least one of the following benefits.

1. Ensure that SL transmissions (LTE-V2X or NR-V2X) on high priority RATs are protected and have a sufficient amount of power allocated to basic V2X transmissions.

2. When there is no overlapping transmission or there is remaining power unused by the lower priority RATs, it is ensured that more Tx power is allocated to SL transmissions (LTE-V2X or NR-V2X) on the high priority RATs.

Those of ordinary skill in the art will appreciate that each of the units, algorithms, and steps described and disclosed in the embodiments of the disclosure are implemented using electronic hardware, or a combination of software and electronic hardware for a computer. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the particular implementation.

One of ordinary skill in the art may implement the functionality of each particular application in a different manner without departing from the scope of the present disclosure. It will be appreciated by those of ordinary skill in the art that, since the operation of the systems, devices and units described above are substantially identical, reference may be made to the operation of the systems, devices and units in the embodiments described above. For ease of description and brevity, these operations will not be described in detail.

It should be understood that the systems, devices, and methods disclosed in the embodiments of the present disclosure may be implemented in other ways. The above embodiments are merely illustrative. The partitioning of the cells is based solely on logic functions, but other partitions exist in the implementation. It is possible that multiple units or components are combined or integrated into another system. It is also possible to omit or skip some features. On the other hand, the mutual coupling, direct coupling or communicative coupling shown or discussed operates through some interfaces, devices or units, whether indirectly or through electrical, mechanical or other forms of communication.

The units described as separate parts are or are not physically separated. The units for display are or are not physical units, i.e. are located in one place or are distributed over a plurality of network units. Some or all of the units are used according to the purpose of the embodiment. In addition, each functional unit in each embodiment may be integrated in one processing unit, or physically separate, or two or more units may be integrated in one processing unit.

If the software functional unit is implemented and sold and used as a product, it may be stored in a readable storage medium in a computer. Based on such understanding, the technical solutions proposed by the present disclosure may be implemented in essence or partially in the form of a software product. Alternatively, a part of the technical solutions beneficial to the conventional technology may be implemented in 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 computing device (e.g., a personal computer, server, or network device) to execute all or part of the steps disclosed by embodiments of the present disclosure. The storage medium includes a USB disk, a removable hard disk, a read-only memory (ROM), a random-access memory (RAM), a floppy disk, or other medium capable of storing program code.

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

Claims

1. A user equipment for wireless communication, comprising:

a memory;

a transceiver; and

a processor, coupled to the memory and the transceiver,

wherein the processor is configured to:

for a first side-link SL vehicle-to-outside V2X transmission on a first radio access technology RAT, allocating and reserving a transmission power reservation level to guarantee a minimum level of X% of a total configured maximum output power of the user equipment; and

for a second SL V2X transmission on a second RAT, a transmission power level up to a maximum level of (100-X)% of a total configured maximum output power of the user equipment is allocated, wherein X is greater than 0 and less than 100;

wherein, during a first non-overlapping period of a first SL V2X transmission on the first RAT, a transmission power of the user equipment is X% of a total configured maximum output power of the user equipment; during an overlapping period of time when a first SL V2X transmission is simultaneously made on the first RAT and a second SL V2X transmission is made on the second RAT, the combined transmission power of the user equipment is equal to 100% of the total configured maximum output power of the user equipment; during a second non-overlapping period of time of a second SL V2X transmission on the second RAT, the transmission power of the user equipment is (100-X)% of a total configured maximum output power of the user equipment;

in case there is coordination of V2X operation on the first RAT and the second RAT, or information about SL scheduling, transmission timing and/or transmission power allocation or usage of one of the first RAT and the second RAT is known by the other of the first RAT and the second RAT:

when the transmission power of the user equipment is less than (100-X)% of the total configured maximum output power of the user equipment during the second SL V2X transmission on the second RAT, the processor is configured to allocate the transmission power of the user equipment greater than X% of the total configured maximum output power of the user equipment during the first SL V2X transmission on the first RAT.

2. The user equipment of claim 1, wherein the transmission power reservation level for a first SL V2X transmission is predetermined, preconfigured, or configured by a network base station.

3. The user equipment of claim 1 or 2, wherein in case there is no coordination of V2X operation on a first RAT and a second RAT, or information about SL scheduling, transmission timing and/or transmission power allocation or usage of one of the first RAT and the second RAT is not shared with the other of the first RAT and the second RAT:

the processor is configured to select to increase transmission power of a user equipment on the first RAT to exceed the transmission power reservation level.

4. The user equipment of claim 3, wherein, during an overlapping period of time in which a first SL V2X transmission is simultaneously made on the first RAT and a second SL V2X transmission is made on the second RAT, if a combined transmission power of user equipment is greater than 100% of a total configured maximum output power of user equipment, the processor reduces at least one of the transmission powers of user equipment on the first RAT and the second RAT such that the combined transmission power of user equipment is adjusted to be less than or equal to 100% of the total configured maximum output power of user equipment.

5. The user equipment of claim 4, wherein the processor reduces transmission power of the user equipment on one of the first RAT and the second RAT having a priority that is less than a priority of the other of the first RAT and the second RAT.

6. The user equipment of claim 4, wherein the processor reduces transmission power of the user equipment on the first RAT and the second RAT equally.

7. The user equipment of claim 1 or 2, wherein the first RAT and the second RAT are different.

8. The user equipment of claim 1 or 2, wherein one of the first RAT and the second RAT is long term evolution, V2X, LTE-V2X, and the other of the first RAT and the second RAT is a new air interface, V2X, NR-V2X.

9. A method of wireless communication for a user device, comprising:

when the transmission power of the user equipment is less than (100-X)% of the total configured maximum output power of the user equipment during the second SL V2X transmission on the second RAT, the method further comprises allocating the transmission power of the user equipment greater than X% of the total configured maximum output power of the user equipment during the first SL V2X transmission on the first RAT.

10. The method of claim 9, wherein the transmission power reservation level for a first SL V2X transmission is predetermined, preconfigured, or configured by a network base station.

11. The method of claim 9 or 10, wherein in the absence of coordination of V2X operation on a first RAT and a second RAT, or information about SL scheduling, transmission timing and/or transmission power allocation or usage of one of the first RAT and the second RAT is not shared with the other of the first RAT and the second RAT:

a transmission power of a user equipment on the first RAT is selected to be increased beyond the transmission power reservation level.

12. The method of claim 11, wherein during an overlapping period of time in which a first SL V2X transmission is simultaneously performed on the first RAT and a second SL V2X transmission is performed on the second RAT, if a combined transmission power of a user equipment is greater than 100% of a total configured maximum output power of the user equipment, the method further comprises: at least one of the transmission powers of the user equipment on the first RAT and the second RAT is reduced such that the combined transmission power of the user equipment is adjusted to be less than or equal to 100% of the total configured maximum output power of the user equipment.

13. The method of claim 12, further comprising: reducing transmission power of the user equipment on one of the first RAT and the second RAT, the one RAT having a priority that is less than a priority of the other of the first RAT and the second RAT.

14. The method of claim 12, further comprising: the transmission power of the user equipment on the first RAT and the second RAT is reduced equally.

15. The method of claim 9 or 10, wherein the first RAT and the second RAT are different.

16. The method of claim 9 or 10, wherein one of the first RAT and the second RAT is long term evolution, V2X, LTE-V2X, and the other of the first RAT and the second RAT is a new air interface, V2X, NR-V2X.

17. A non-transitory machine-readable storage medium having instructions stored thereon, which when executed by a computer, cause the computer to perform the method of any of claims 9 to 16.

18. A terminal apparatus comprising: a processor; and a memory configured to store a computer program, the processor being configured to execute the computer program stored in the memory to perform the method according to any one of claims 9 to 16.