CN115119344A - Method executed by user equipment and user equipment - Google Patents
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Abstract
The invention provides a method executed by user equipment and the user equipment. The method performed by the user equipment UE is a method of performing sidelink communications through a transmitting UE and a receiving UE, wherein the method comprises the steps of: when receiving UE is in an active state, if a Sidelink discontinuous reception Command Sidelink DRX Command sent by sending UE is received, stopping running a timer related to the active state, wherein the Sidelink DRX Command is sent in a form of MAC CE, and the MAC CE and the MAC SDU are multiplexed in one MAC PDU for sending, or the MAC CE is carried in one MAC PDU for sending; the transmitting UE sets the priority of the MAC CE for assembling the MAC PDU and can also be used to determine the corresponding priority of the MAC PDU.
Description
Technical Field
The present invention relates to the field of wireless communication technology, and more particularly, to a method performed by a user equipment and a corresponding user equipment.
Background
Vehicle wireless communication technology (V2X) is a new generation of information communication technology that connects a vehicle with Everything, where V represents a vehicle, X represents any object that interacts information with the vehicle, and X currently mainly contains vehicles, people, traffic side infrastructure and networks.
In a pair of UEs communicating V2X traffic, the UEs can be classified into transmitting UE (tx UE) and receiving UE (rx UE) according to the transmission and reception classification. Since the transmitting UE is not always transmitting information, in order to realize energy saving of the receiving UE, the receiving UE may be set to a Discontinuous Reception (DRX) mode, that is, the receiving UE performs PSCCH monitoring at an appointed time.
In DRX mode, the receiving UE may be in a DRX ACTIVE state (DRX ACTIVE state) or a DRX INACTIVE state (DRX INACTIVE state). Referred to herein simply as the active state and the inactive state. In the activated state, the receiving UE monitors whether the PSCCH from the sending UE exists, and if the PSCCH from the sending UE exists, the receiving UE can further receive the PSSCH according to scheduling information in SCI carried on the PSCCH, so that data information sent by the sending UE is acquired; in the inactive state, the receiving UE will not perform the aforementioned operations.
The receiving UE may periodically enter an active state, and for the receiving UE currently in the active state, if a Sidelink discontinuous reception Command (Sidelink DRX Command) sent from the sending UE is received, the timer related to the active state may be stopped, so as to enter the inactive state in advance.
Such a Sidelink DRX Command is transmitted in the form of a MAC CE. The sending UE may multiplex the MAC CE and the MAC SDU into one MAC PDU for sending, or may carry the MAC CE alone into one MAC PDU for sending. Under these scenarios, how to determine the value of the priority of the MAC CE is a problem to be solved.
In addition, since the MAC CE indicates the receiving UE to enter the inactive state, if the receiving UE has triggered CSI reporting and the CSI reporting needs to be sent to the sending UE, how to process the triggered CSI reporting is also a problem to be solved.
Disclosure of Invention
The present invention is directed to solving the above problems and provides a method performed by a user equipment and a user equipment.
According to an aspect of the present invention, there is provided a method performed by a user equipment, UE, for performing a sidelink communication by a transmitting UE and a receiving UE, wherein,
the method comprises the following steps:
when receiving UE is in an active state, if a Sidelink discontinuous reception Command Sidelink DRX Command sent by sending UE is received, stopping running a timer related to the active state, wherein the Sidelink DRX Command is sent in a form of MAC CE, and the MAC CE and the MAC SDU are multiplexed in one MAC PDU for sending, or the MAC CE is carried in one MAC PDU for sending;
the transmitting UE sets the priority of the MAC CE for assembling the MAC PDU and can also be used to determine the corresponding priority of the MAC PDU.
In the above-described method performed by the user equipment UE, it is preferable that,
when assembling the MAC PDU, the sending UE carries out the following steps from high to low in order of priority:
data from the SCCH;
Sidelink CSI Reporting MAC CE；
data from the STCH;
Sidelink DRX Command MAC CE。
in the above-described method performed by the user equipment UE, it is preferable that,
when the sending UE assembles the MAC PDU, if the Sidelink DRX Command MAC CE and one MAC SDU are multiplexed in one MAC PDU, the value of the priority corresponding to the Sidelink DRX Command MAC CE is set based on the value of the priority of the logic channel to which the data carried in the MAC SDU belongs.
In the above-described method performed by the user equipment UE, it is preferable that,
setting the value of the priority corresponding to the Sidelink DRX Command MAC CE to be equal to the value of the priority of the logical channel to which the data carried in the MAC SDU belongs.
In the above-described method performed by the user equipment UE, it is preferable that,
when the sending UE assembles the MAC PDU, if the Sidelink DRX Command MAC CE and a plurality of MAC SDUs are multiplexed in one MAC PDU, setting the value of the priority corresponding to the Sidelink DRX Command MAC CE based on the value of the priority of the logic channel to which the data carried in the MAC SDUs belong.
In the above-described method performed by the user equipment UE, it is preferable that,
and setting the value of the priority corresponding to the Sidelink DRX Command MAC CE equal to the value with the highest value of the priority of the corresponding logical channel in the plurality of MAC SDUs.
In the above-described method performed by the user equipment UE, it is preferable that,
the priority of a Sidelink DRX Command MAC CE is set or specified to be lowest if the MAC CE is required to be multiplexed with one or more MAC SDUs in one MAC PDU for transmission.
In the above-described method performed by the user equipment UE, it is preferable that,
if the MAC CE and the MAC SDU are not allowed to be multiplexed in one MAC PDU, the priority of the Sildelink DRX Command MAC CE is set or specified to be the highest.
In the above-described method performed by the user equipment UE, it is preferable that,
if the receiving UE has triggered CSI reporting which is not cancelled, and the CSI reporting is to be sent to a sending UE which sends a Sidelink DRX Command MAC CE to the receiving UE, or the CSI reporting is related to a pair of source and destination addresses which take the sending UE as a destination and the receiving UE as a source, the receiving UE cancels the triggered CSI reporting, or stops a timer related to the CSI reporting.
According to another aspect of the present invention, there is provided a user equipment comprising:
a processor; and
a memory having instructions stored thereon,
the instructions, when executed by the processor, cause the user equipment to perform the method according to the above description.
According to the method performed by the user equipment and the corresponding user equipment, the priority of the MAC CE can be determined, and triggered CSI reporting can be effectively processed.
Drawings
The above and other features of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which:
fig. 1 is a flow chart illustrating a method performed by a user equipment according to an embodiment of the present invention.
Fig. 2 is a block diagram showing a schematic configuration of a user equipment according to the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and the detailed description. It should be noted that the present invention should not be limited to the specific embodiments described below. In addition, for the sake of brevity, detailed descriptions of well-known technologies not directly related to the present invention are omitted to prevent confusion of understanding of the present invention.
Before describing in detail, several terms mentioned in the present invention will be explained as follows. Unless otherwise indicated, all terms referred to in the present invention have the following meanings.
UE User Equipment
NR New Radio New generation wireless technology
Sidelink side chain
V2X Vehicle communication to Everything Vehicle communication
MAC Medium Access Control multimedia Access Control
MAC CE MAC control element
LCID Logical Channle Identity Logical channel Identity
PDU Protocol Data Unit Protocol Data Unit
SDU Service Data Unit
MAC SDU MAC Service Data Unit
MAC PDU MAC Protocol Data Unit
PSSCH Physical Sidelink Shared Channel
PSFCH Physical Sidelink Feedback Channel Physical side link Feedback Channel
SCI Sidelink Control Information side-chain Control Information
PSCCH Physical Sidelink Control Channel Physical side link Control Channel
RRC Radio Resource Control
HARQ Hybrid Automatic Repeat Request
CSI Channel State Information
CSI reporting Channel State Information reporting
SCCH Sidelink Control Channel side link Control Channel
STCH Sidelink Traffic Channel Sidelink Traffic Channel
The words used in this document are words of description, corresponding parts, words of equivalents, etc.
The two statements sidelink and V2X herein may be used interchangeably.
There is at least one pair of UEs, TX UE and RX UE. There may also be a set of UEs, where one UE is a TX UE and the other UEs are RX UEs.
MAC entity (entity) assembly and Multiplexing (Multiplexing and allocation)
At least one MAC PDU is contained in one transport block-zero or one or more MAC SDUs or MAC CEs may be contained in one MAC PDU.
The MAC SDUs contain data from the upper layer, and the data in each MAC SDU comes from a different logical channel. According to the service requirement, the logic information has corresponding priority, and the value of the logic information can be from 1 to 8, namely 8 integers. Wherein the larger the value, the lower the corresponding priority.
These priorities are used for the assembly of MAC entities. Multiple MAC SDUs can be multiplexed in the same MAC PDU as long as the size of the transport block is sufficient, and similarly, one or more MAC SDUs and a MAC CE can also be multiplexed in the same MAC PDU.
When assembling the MAC PDU, the MAC SDU and the MAC CE which are multiplexed with the same MAC PDU are assembled according to the priority data. For example, the MAC SDU or MAC CE with the highest priority is first placed in the MAC PDU, then the MAC SDU or MAC CE with the next highest priority is placed in the MAC PDU, and so on until there is no space left in the MAC PDU. The remaining MAC SDUs or MAC CEs are assembled into the next MAC PDU in the same manner. The MAC PDU assembled first can be transmitted first, and the MAC SDU or MAC CE with the high visible priority can always be transmitted first.
SL DRX
The UE configured with SL DRX may be in a DRX ACTIVE state (DRX ACTIVE state) or a DRX INACTIVE state (DRX INACTIVE state). Referred to herein simply as the active state and the inactive state. As receiving UE, in an activated state, the UE monitors whether a transmitted PSCCH from the transmitting UE exists, and if the transmitted PSCCH exists, the UE can further receive the PSSCH according to scheduling information in SCI carried on the PSCCH, so as to acquire data information transmitted by the transmitting UE; in the inactive state, the UE will not perform the aforementioned operations.
The UE may determine whether to be in the SL DRX active state according to the running of the timer. For example, when the timer SL-DRX-On-DurationTimer is running (running), the UE is in the active state; the UE is also active when the timer SL-DRX-inactivity timer is running. These timers may be referred to as active-state-related timers.
As a transmitting UE, data and information may be transmitted to a receiving UE while the receiving UE is in an active state. In order to ensure that the sending UE is in an active state when sending data, the sending UE may run the SL-DRX-On-duration timer and the SL-DRX-inactivity timer On the sending UE side. The time length configuration of the SL-DRX-On-duration timer and the SL-DRX-inactivity timer On the sending UE side may be the same as or similar to the time length configuration of the SL-DRX-On-duration timer and the SL-DRX-inactivity timer On the receiving UE side, and the start and stop conditions thereof may be the same as or similar to or corresponding to each other (for example, the sending UE starts a timer On the sending UE side after sending an SCI to the receiving UE, and the receiving UE starts a timer On the receiving UE side after receiving an SCI from the sending UE), thereby ensuring basic synchronization between the sending UE and the receiving UE with respect to an active state.
Hereinafter, several embodiments of the present invention are described in detail.
Example 1
The present embodiment provides a method performed by a user equipment UE, which is a method for performing sidelink communications by a transmitting UE and a receiving UE. As shown in fig. 1, there are the following steps.
S101: when the receiving UE is in an active state, if a Sidelink discontinuous reception Command (Sidelink DRX Command) sent by the sending UE is received, the timer related to the active state is stopped running. The Sidelink DRX Command is sent in the form of MAC CE, the MAC CE and the MAC SDU are multiplexed in one MAC PDU for sending, or the MAC CE is carried in one MAC PDU for sending.
S102: the transmitting UE sets the priority of the MAC CE for assembling the MAC PDU and can also be used to determine the corresponding priority of the MAC PDU.
Specifically, the UE sets or specifies a value of the priority of the Sidelink DRX Command MAC CE to be '8'. Here, a value of '8' corresponds to the lowest priority. For example, in the case of a liquid,
the MAC entity of the sending UE is performed from high to low according to the following priority order when assembling the MAC PDU:
data from SCCH (data from SCCH);
Sidelink CSI Reporting MAC CE；
data from STCH;
Sidelink DRX Command MAC CE。
the data from SCCH in the above list is at the highest priority and the Sidelink DRX Command MAC CE is at the lowest priority.
For the situation that the Sidelink DRX Command MAC CE is carried in one MAC PDU for transmission, it may be determined that the value corresponding to the priority of the MAC PDU is equal to the value of the priority of the Sidelink DRX Command MAC CE. For example, the value of the priority of the Sidelink DRX Command MAC CE is set to be '8', and then the value of the priority corresponding to the MAC PDU carrying only the Sidelink DRX Command MAC CE is set to be '8'. The value of the determined priority of the MAC PDU may be provided to the physical layer, and the UE sets a value of a priority field (priority field) in the SCI based on the value, for example, in the foregoing case, the value of the priority field in the SCI is set to 7. In the prior art, the value range of the priority domain is 0-7, and the value range of the priority of the MAC PDU is 1-8, so when the priority of the MAC PDU is 8, the value of the priority domain can be set to 7, which indicates the lowest priority.
Example 2
In one case, when the sending UE assembles the MAC PDU, the Sidelink DRX Command MAC CE and one MAC SDU are multiplexed in one MAC PDU, and then the sending UE sets a value of priority corresponding to the Sidelink DRX Command MAC CE based on a value of priority of a logical channel to which data carried in the MAC SDU belongs. For example, the value of the priority corresponding to the Sidelink DRX Command MAC CE is set to be equal to the value of the priority of the logical channel to which the data carried in the MAC SDU belongs, or + 1.
In another case, when the sending UE assembles the MAC PDU, the Sidelink DRX Command MAC CE and the multiple MAC SDUs are multiplexed in one MAC PDU, and then the sending UE may set a value of the priority corresponding to the Sidelink DRX Command MAC CE based on a value of the priority of a logical channel to which data carried in the MAC SDUs belongs. For example, there are two MAC SDUs, where the priority values of the logical channels to which the data carried by the two MAC SDUs belong are different, one value is '2', and the other value is '4' (it is assumed that the larger the value is, the lower the priority is), the priority value of the Sidelink DRX Command MAC CE may be set to be '4', that is, the priority value of the Sidelink DRX Command MAC CE is set to be equal to the value with the highest priority value of the corresponding logical channel in the multiple MAC SDUs.
It should be noted that, although the value of the priority corresponding to the Sidelink DRX Command MAC CE is the same as the MAC SDU with the highest priority value, that is, the priorities of the MAC SDU and the MAC SDU are the same, in the actual assembly process, the MAC entity may assemble the MAC PDUs according to the order provided in embodiment 1.
Example 3
The sending UE sets or specifies the value of the priority of the SL DRX MAC CE according to different situations.
In one case, if the SL DRX MAC CE is required (required) to be multiplexed with one or more MAC SDUs in one MAC PDU for transmission, the priority of the Sidelink DRX Command MAC CE may be set or specified to be '8', i.e., the lowest priority, or set as in embodiment 2, or multiplexed and assembled as in embodiment 1.
In another case, if (not allowed) multiplexing of the SL DRX MAC CE and the MAC SDU in one MAC PDU is not allowed, the priority of the Sidelink DRXCommand MAC CE may be set or specified to be '1', i.e. the highest priority.
Yet another embodiment of the above scheme may be
When the SL DRX MAC CE is multiplexed with one or more MAC SDUs in one MAC PDU, the value of the priority of the Sidelink DRX Command MAC CE may be set or specified to be '8', or set as in embodiment 2, or multiplexed and assembled as in embodiment 1;
when the SL DRX MAC CE is transmitted, it is not multiplexed with any MAC SDU in the same MAC PDU, and then the value of the priority of the Sidelink DRX Command MAC CE may be set or specified to be '1'.
Example 4
The receiving ue (ue a) may stop the operation of DRX-related timers, such as SL-DRX-On-duration timer or SL-DRX-inactivity timer, upon receiving the sildenk DRX Command MAC CE sent by the sending ue (ue b). .
If at this time there is triggered, non-cancelled, CSI reporting by the receiving UE (UE a) that is to be sent to the sending UE (UE b) that sends a Sidelink DRX Command mac ce to the receiving UE, or that is associated with a pair of source and destination addresses that are sourced by the sending UE (UE a) and destined for the sending UE (UE b), the receiving UE (UE a) may cancel (cancel) the triggered CSI reporting and, optionally, stop a timer associated with the CSI reporting, such as a SL-CSI reporting timer.
Optionally, the sending UE side also has corresponding SL-DRX-On-duration timer and SL-DRX-inactivity timer. This correspondence means that the transmitting UE side also maintains a timer related to DRX for the receiving UE, or for a pair of addresses associated with the transmitting UE and the receiving UE. The transmitting UE transmits information such as data to the receiving UE only during the operation of these timers.
When the sending UE sends the MAC PDU carrying the Sidelink DRX Command MAC CE to the receiving UE, the sending UE may stop sending the SL-DRX-On-duration timer and the SL-DRX-inactivity timer that the UE side is running. Preferably, when the MAC PDU carrying the Sidelink DRX Command MAC CE transmitted by the transmitting UE is acknowledged (acknowledged) by the receiving UE, the transmitting UE may stop transmitting the SL-DRX-On-duration timer and the SL-DRX-inactivity timer that are running On the UE side. Such an acknowledgement may refer to the transmitting UE having received the transmitted PSFCH from the receiving UE and carrying positive acknowledgement (positive acknowledgement) information thereon.
Fig. 2 is a block diagram schematically illustrating a user equipment UE according to the present invention. As shown in fig. 2, the user equipment UE200 includes a processor 201 and a memory 202. The processor 201 may include, for example, a microprocessor, a microcontroller, an embedded processor, or the like. The memory 202 may include, for example, volatile memory (e.g., random access memory RAM), a Hard Disk Drive (HDD), non-volatile memory (e.g., flash memory), or other memory, among others. The memory 202 has stored thereon program instructions. Which when executed by the processor 201 may perform the above-described method performed by the user equipment as described in detail in the present invention.
The program running on the apparatus according to the present invention may be a program that causes a computer to realize the functions of the embodiments of the present invention by controlling a Central Processing Unit (CPU). The program or information processed by the program may be temporarily stored in a volatile memory (such as a random access memory RAM), a Hard Disk Drive (HDD), a nonvolatile memory (such as a flash memory), or other memory system.
A program for implementing the functions of the embodiments of the present invention may be recorded on a computer-readable recording medium. The corresponding functions can be realized by causing a computer system to read the programs recorded on the recording medium and execute the programs. The term "computer system" as used herein may be a computer system embedded in the device and may include an operating system or hardware (e.g., peripheral devices). The "computer-readable recording medium" may be a semiconductor recording medium, an optical recording medium, a magnetic recording medium, a recording medium that stores a program for short-term dynamics, or any other recording medium that is readable by a computer.
Various features or functional blocks of the devices used in the above-described embodiments may be implemented or performed by circuitry (e.g., a single or multiple chip integrated circuits). Circuitry designed to perform the functions described herein may include a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The circuit may be a digital circuit or an analog circuit. Where new integrated circuit technologies have emerged as a replacement for existing integrated circuits due to advances in semiconductor technology, one or more embodiments of the present invention may also be implemented using these new integrated circuit technologies.
Further, the present invention is not limited to the above-described embodiments. While various examples of the embodiments have been described, the present invention is not limited thereto. Fixed or non-mobile electronic devices installed indoors or outdoors may be used as terminal devices or communication devices, such as AV devices, kitchen devices, cleaning devices, air conditioners, office devices, vending machines, and other home appliances.
As above, the embodiments of the present invention have been described in detail with reference to the accompanying drawings. However, the specific configuration is not limited to the above embodiment, and the present invention includes any design modification without departing from the gist of the present invention. In addition, the present invention can be variously modified within the scope of the claims, and embodiments obtained by appropriately combining the technical means disclosed in the different embodiments are also included in the technical scope of the present invention. Further, components having the same effects described in the above embodiments may be substituted for each other.
Claims (10)
1. A method performed by a User Equipment (UE) is a method of performing sidelink communications through a transmitting UE and a receiving UE, wherein,
the method comprises the following steps:
when receiving UE is in an active state, if a Sidelink discontinuous reception Command Sidelink DRX Command sent by sending UE is received, stopping running a timer related to the active state, wherein the Sidelink DRX Command is sent in a form of MAC CE, and the MAC CE and the MAC SDU are multiplexed in one MAC PDU for sending, or the MAC CE is carried in one MAC PDU for sending;
the transmitting UE sets the priority of the MAC CE for assembling the MAC PDU and can also be used to determine the corresponding priority of the MAC PDU.
2. The method performed by a user equipment, UE, of claim 1,
when assembling the MAC PDU, the sending UE carries out the following steps from high to low in order of priority:
data from the SCCH;
Sidelink CSIReporting MAC CE；
data from the STCH;
Sidelink DRX Command MAC CE。
3. the method performed by a user equipment, UE, of claim 2,
when the sending UE assembles the MAC PDU, if the Sidelink DRX Command MAC CE and one MAC SDU are multiplexed in one MAC PDU, the value of the priority corresponding to the Sidelink DRX Command MAC CE is set based on the value of the priority of the logic channel to which the data carried in the MAC SDU belongs.
4. The method performed by a user equipment, UE, of claim 3,
setting the value of the priority corresponding to the Sildelink DRX Command MAC CE equal to the value of the priority of the logical channel to which the data carried in the MAC SDU belongs.
5. The method performed by a user equipment, UE, of claim 2,
when the sending UE assembles the MAC PDU, if the Sidelink DRX Command MAC CE and a plurality of MAC SDUs are multiplexed in one MAC PDU, setting the value of the priority corresponding to the Sidelink DRX Command MAC CE based on the value of the priority of the logic channel to which the data carried in the MAC SDUs belong.
6. The method performed by a user equipment, UE, of claim 5,
and setting the value of the priority corresponding to the Sidelink DRX Command MAC CE equal to the value with the highest value of the priority of the corresponding logical channel in the plurality of MAC SDUs.
7. The method performed by a user equipment, UE, of claim 2,
the priority of a Sidelink DRX Command MAC CE is set or specified to be lowest if the MAC CE is required to be multiplexed with one or more MAC SDUs in one MAC PDU for transmission.
8. The method performed by a user equipment, UE, of claim 2,
if the MAC CE and the MAC SDU are not allowed to be multiplexed in one MAC PDU, the priority of the Sildelink DRX Command MAC CE is set or specified to be the highest.
9. The method performed by a user equipment, UE, of claim 2,
if the receiving UE has triggered CSI reporting which is not cancelled, and the CSI reporting is to be sent to a sending UE which sends a Sildelink DRX Command MAC CE to the receiving UE, or the CSI reporting is related to a pair of source and destination addresses which take the sending UE as a destination and the receiving UE as a source, the receiving UE cancels the triggered CSIrreporting, or stops a timer related to the CSI reporting.
10. A user equipment, comprising:
a processor; and
a memory having stored therein instructions that, when executed,
the instructions, when executed by the processor, cause the user equipment to perform the method of any of claims 1-9.
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| US11751141B2 (en) * | 2019-08-15 | 2023-09-05 | Qualcomm Incorporated | Discontinuous reception operation for sidelink communication |
| US11516876B2 (en) * | 2019-08-19 | 2022-11-29 | Qualcomm Incorporated | Discontinuous reception configuration for sidelink |
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