CN110958088B - Communication method and device - Google Patents

Communication method and device Download PDF

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Publication number
CN110958088B
CN110958088B CN201811133384.9A CN201811133384A CN110958088B CN 110958088 B CN110958088 B CN 110958088B CN 201811133384 A CN201811133384 A CN 201811133384A CN 110958088 B CN110958088 B CN 110958088B
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time
feedback information
harq feedback
harq
physical uplink
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CN110958088A (en
Inventor
张战战
铁晓磊
花梦
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN201811133384.9A priority Critical patent/CN110958088B/en
Priority to PCT/CN2019/108277 priority patent/WO2020063782A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/28—Discontinuous transmission [DTX]; Discontinuous reception [DRX]

Abstract

A communication method and a communication device are used for solving the problem that network equipment cannot schedule and retransmit DCI in time, so that data delay is increased. The method comprises the following steps: and sending a physical uplink channel to the network equipment, wherein the physical uplink channel carries the HARQ feedback information. And starting a downlink hybrid automatic repeat request round-trip time timer at a first time point, and allowing the terminal device not to monitor a physical downlink control channel during the time period of the downlink hybrid automatic repeat request round-trip time timer, where the first time point is any time point in a first time period, the starting time of the first time period is the time when all symbols bearing the HARQ feedback information are sent, and the ending time of the first time period is the time when the last symbol of the physical uplink channel is sent.

Description

Communication method and device
Technical Field
The present application relates to the field of communications technologies, and in particular, to a communication method and apparatus.
Background
Currently, a wireless communication system designs a connected-discontinuous reception (C-DRX) mechanism to allow a terminal device to periodically enter a sleep state when the terminal device is in a Radio Resource Control (RRC) connected state, without monitoring a Physical Downlink Control Channel (PDCCH), and wake up the terminal device from the sleep state to enter an active state when the PDCCH needs to be monitored, so as to achieve the purpose of saving power.
In the C-DRX mechanism, after detecting a PDCCH, a terminal device receives a Physical Downlink Shared Channel (PDSCH) according to downlink scheduling information carried by the PDCCH. After decoding the PDSCH, the terminal device sends hybrid automatic repeat request (HARQ) feedback information to the network device through a Physical Uplink Control Channel (PUCCH) or a Physical Uplink Shared Channel (PUSCH).
The terminal equipment starts a downlink hybrid automatic repeat request round-trip time timer (HARQ-RTT-TimerDL) after all symbols of PUCCH or PUSCH carrying HARQ feedback information are sent. The length of the HARQ-RTT-TimerDL is configured by the network device according to the time required by the process of processing the HARQ feedback information by the network device to determine the retransmission data. The terminal device may assume that the network device does not schedule Downlink Control Information (DCI) indicating retransmission of data during the HARQ-RTT-TimerDL timing, and therefore the terminal device may not monitor the PDCCH during the HARQ-RTT-TimerDL timing. When the HARQ-RTT-TimerDL is out of time, if there is a Transport Block (TB) decoding failure in the PDSCH, the terminal device starts a DRX downlink retransmission timer (DRX-retransmission TimerDL), thereby entering an active state, and starts to perform blind detection on the PDCCH indicating downlink retransmission.
And the network equipment processes the HARQ feedback information after receiving the HARQ feedback information, determines retransmission data and schedules retransmission DCI when the terminal equipment is in an activated state. However, the terminal device starts the HARQ-RTT-TimerDL after sending all symbols of the PUCCH or PUSCH, which may cause that the network device has already processed the HARQ feedback information, but the HARQ-RTT-TimerDL is not yet over time, so that the DRX-retransmission TimerDL may be started until the HARQ-RTT-TimerDL is over time, which may cause a time delay when the terminal device enters an active state, and further cause the network device to wait for the terminal device to enter the active state after processing the HARQ feedback information, which may cause the network device to fail to schedule the retransmission DCI in time, and increase data delay.
Disclosure of Invention
The application provides a communication method and device, which are used for solving the problem that network equipment cannot schedule and retransmit DCI in time, so that data delay is increased.
In a first aspect, the present application provides a communication method, which may be applied to a terminal device, or a chip on the terminal device, or a chipset on the terminal device, and so on. The communication method comprises the following steps: in the process of sending a physical uplink channel to a network device (the physical uplink channel carries hybrid automatic repeat request HARQ feedback information), a downlink hybrid automatic repeat request round-trip time timer is started at a first time point, and a terminal device is allowed not to monitor a physical downlink control channel during the time period of the downlink hybrid automatic repeat request round-trip time timer, wherein the first time point is any time point in a first time period, the starting time of the first time period is the time when all symbols bearing the HARQ feedback information are sent, and the ending time of the first time period is the time when the last symbol of the physical uplink channel is sent.
Compared with the prior art that the network equipment starts to process the HARQ feedback information after receiving the HARQ feedback information, and the terminal equipment starts the HARQ-RTT-TimerDL timer after sending all symbols of the PUCCH or PUSCH carrying the HARQ feedback information, the terminal equipment in the embodiment of the application can start the HARQ-RTT-TimeDL timer at any time before the time point when the last symbol of the PUCCH or PUSCH is sent out after the time point when all symbols carrying the HARQ feedback information are sent out, so that the delay of starting the DRX-RecransmissionTimeDL timer can be reduced, and the delay of the terminal equipment entering an active state can be further reduced. Therefore, after the network device processes the HARQ feedback information, the time for waiting for the terminal device to enter the active state can be reduced, so that the DCI is scheduled and retransmitted in time, and the data delay can be reduced. For example, the terminal device finishes transmitting the symbol carrying the HARQ feedback information at time t1, and finishes transmitting all symbols of the PUCCH or PUSCH at time t2 after time t1, in the prior art, the terminal device needs to start the HARQ-RTT-TimerDL timer only after time t2, but in this embodiment of the present application, the terminal device may start the HARQ-RTT-TimerDL timer at any time t3 before time t2 after time t1, and as a result, in this embodiment of the present application, the delay of about time t2-t3 may be reduced at most.
In one possible design, the first time point is a first symbol after a last symbol carrying the HARQ feedback information is transmitted. In the above design, when the first symbol after the last symbol carrying the HARQ feedback information is sent is started, the downlink hybrid automatic repeat request round-trip time timer may reduce the waiting time for scheduling and retransmitting the DCI to the greatest extent, so as to reduce the data delay to the greatest extent. For example, the terminal device may finish transmitting symbols carrying HARQ feedback information at time t1, and finish transmitting all symbols of PUCCH or PUSCH at time t2 after time t1, and the terminal device may start the HARQ-RTT-TimerDL timer at time t1, so that the delay of about t2-t1 may be reduced. And starting the downlink hybrid automatic repeat request round trip time timer at the first symbol after the last symbol carrying the HARQ feedback information is sent, so that the time for processing the HARQ feedback information by the HARQ-RTT-TimerDL timer and the network equipment can be better matched, the network equipment can set the size of the HARQ-RTT-TimerDL timer according to the time for processing the HARQ feedback information, and the complexity of the system for configuring the size of the HARQ-RTT-TimeDL timer is reduced.
Specifically, if the HARQ feedback information is carried in one symbol, the first time point is a first symbol after the symbol carrying the HARQ feedback information is sent. If the HARQ feedback information is carried in multiple symbols, the first time point is a first symbol after a last symbol carrying the HARQ feedback information is sent. In the above design, when the HARQ feedback information is carried in one symbol, the HARQ feedback information starts the HARQ round trip time timer at the symbol next to the symbol, and when the HARQ feedback information is carried in a plurality of symbols, the HARQ feedback information starts the HARQ round trip time timer at the symbol next to the symbol last carrying the HARQ feedback information.
In one possible design, the physical uplink channel may be a physical uplink control channel. In the above design, the terminal device may send HARQ feedback information on a physical uplink control channel.
In one possible design, the physical uplink channel may also be a physical uplink shared channel. In the above design, the terminal device may further send HARQ feedback information on the physical uplink shared channel. For example, the HARQ feedback information may be sent on the physical uplink shared channel when the physical uplink control channel of the single slot overlaps with the physical uplink shared channel of the single slot. Alternatively, the HARQ feedback information may be transmitted in an overlapping slot of the physical uplink shared channel when the physical uplink control channel of the single slot overlaps the physical uplink shared channel of the multi-slot.
In a second aspect, the present application provides an apparatus, which may be a terminal device, or may be a chip or a chipset in the terminal device. The apparatus may include a processing unit and a transceiver unit. When the apparatus is a terminal device, the processing unit may be a processor, and the transceiving unit may be a transceiver; the terminal device may further include a storage unit, which may be a memory; the storage unit is configured to store instructions, and the processing unit executes the instructions stored in the storage unit, so that the terminal device performs the corresponding functions in the first aspect. When the apparatus is a chip or a chip set in a terminal device, the processing unit may be a processor, and the transceiving unit may be an input/output interface, a pin, a circuit, or the like; the processing unit executes instructions stored in a storage unit (e.g., a register, a cache, etc.) in the chip or the chipset, or a storage unit (e.g., a read-only memory, a random access memory, etc.) in the terminal device, which is located outside the chip or the chipset, so as to enable the terminal device to perform the corresponding functions in the first aspect.
In a third aspect, an apparatus is provided, comprising: a processor, a communication interface, and a memory. The communication interface is used for transmitting information, and/or messages, and/or data between the device and other devices. The memory is configured to store computer executable instructions, and when the apparatus is running, the processor executes the computer executable instructions stored in the memory, so as to cause the apparatus to perform the communication method according to the first aspect or any one of the first aspects.
In a fourth aspect, the present application also provides a computer-readable storage medium having stored therein instructions, which, when run on a computer, cause the computer to perform the method of the above aspects.
In a fifth aspect, the present application also provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of the above aspects.
Drawings
Fig. 1 is a schematic architecture diagram of a communication system provided in the present application;
fig. 2 is a schematic diagram of a downlink transmission provided in the present application;
fig. 3 is a schematic diagram of another downlink transmission provided in the present application;
fig. 4 is a schematic flow chart of a method of communicating with the present application;
fig. 5 is a schematic diagram of a downlink transmission provided in the present application;
fig. 6 is a schematic diagram of another downlink transmission provided in the present application;
fig. 7 is a schematic diagram of another downlink transmission provided in the present application;
fig. 8 is a schematic diagram of another downlink transmission provided in the present application;
fig. 9 is a schematic structural diagram of a communication device provided in the present application;
fig. 10 is a schematic structural diagram of a communication device provided in the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clear, the present application will be further described in detail with reference to the accompanying drawings.
The communication method provided by the present application can be applied to a communication system configured with a Discontinuous Reception (DRX) mechanism. The architecture of the communication system is shown in fig. 1, and includes a network device and a terminal device, and uplink data transmission and downlink data transmission are performed between the network device and the terminal device. In the communication system, the terminal device performs uplink data transmission based on scheduling information sent by the network device. The communication system according to the embodiment of the present application may be various communication systems, for example, Long Term Evolution (LTE), fifth generation (5G) communication systems, Universal Terrestrial Radio Access (UTRA), evolved UTRA (E-UTRAN), new radio technology (NR), GSM/EDGE radio access network-circuit switched domain (GSM EDGE radio access network-circuit switched domain, GERAN-CS), GSM/EDGE radio access network-data switched domain (GSM EDGE radio access network-packet switched, PS), code division multiple access (code division multiple access, CDMA)2000-1XRTT, and Multi-RAT Dual-Connectivity (MR-DC), and may also be a hybrid communication system of multiple communication architectures, such as LTE and 5G hybrid architectures.
The network device may be a common base station (e.g., a Node B or an eNB), a new radio controller (NR controller), a enode B (gNB) in a 5G system, a centralized network element (centralized unit), a new radio base station, a radio remote module, a micro base station, a relay (relay), a distributed network element (distributed unit), a reception point (TRP), a Transmission Point (TP), or any other radio access device, but the embodiment of the present invention is not limited thereto.
A terminal device, also called a User Equipment (UE), is a device providing voice and/or data connectivity to a user, for example, a handheld device with wireless connection function, a vehicle-mounted device, and so on. Common terminals include, for example: the mobile phone includes a mobile phone, a tablet computer, a notebook computer, a palm computer, a Mobile Internet Device (MID), and a wearable device such as a smart watch, a smart bracelet, a pedometer, and the like.
In a communication system, when a terminal device is in a Radio Resource Control (RRC) connected state, the terminal device may monitor PDCCH subframes at all times without a DRX mechanism. However, in many services in reality, for example, services such as web browsing, etc., a terminal device does not always have information interaction with a network device, but has a certain time interval, and if the terminal device always monitors a Physical Downlink Control Channel (PDCCH), power consumption of the terminal device may be caused. Therefore, on the premise of ensuring effective data transmission, the wireless communication system designs a DRX mechanism to enable the terminal equipment to periodically enter a sleep state at some time without monitoring PDCCH subframes, and awakens the terminal equipment from the sleep state when the PDCCH needs to be monitored, so as to achieve the purpose of saving power.
In the DRX mechanism, if the terminal device is in an active state, the terminal device will continue to monitor the PDCCH. The terminal device is in an active state when any one of a DRX duration timer (DRX-onDurationTimer), a DRX inactivity timer (DRX-inactivity timer), a DRX downlink retransmission timer (DRX-retransmission timer dl), and a DRX uplink retransmission timer (DRX-retransmission timer ul) is running. The DRX-onDurationTimer is started when a certain condition is met for the terminal device configured with the DRX cycle, and the terminal device is in an active state during the DRX-onDurationTimer. The DRX-InactivatyTimer is started when the terminal equipment receives a PDCCH to indicate downlink or uplink new transmission, and the terminal equipment is in an activated state during the timing period of the DRX-InactivatyTimer. In the downlink transmission process, when a terminal device sends a Physical Uplink Control Channel (PUCCH) or a Physical Uplink Shared Channel (PUSCH) to a network device, which carries hybrid automatic repeat request (HARQ) feedback information, a downlink HARQ round trip time timer (HARQ-RTT-timedl) is started, which indicates that the network device does not immediately retransmit, and therefore during the HARQ-RTT-timedl timing period, the terminal device is allowed to enter an inactive state, that is, the terminal device may not monitor the PDCCH. And when the HARQ-RTT-TimerDL is over, if the terminal equipment has data which fails in decoding, starting DRX-retransmission TimerDL. During the DRX-retransmission timerdl timing, the terminal device is in an active state.
The following is a downlink transmission process of the terminal device in the RRC connected state under the DRX mechanism.
Step 1: during the DRX onDurationTimer timing, the terminal device monitors the PDCCH.
Step 2: and if the terminal equipment detects that the PDCCH indicates downlink new transmission during the time period of the DRX-onDurationTimer, starting the DRX-InactivetyTimer. A new transmission of data indicates the start of one HARQ process.
And step 3: the terminal apparatus decodes Downlink Control Information (DCI) in the PDCCH, and receives the PDSCH based on the DCI.
And 4, step 4: and the terminal equipment carries the HARQ feedback information in the PUCCH or PUSCH and sends the HARQ feedback information to the network equipment.
And 5: and the terminal equipment starts HARQ-RTT-TimerDL corresponding to the HARQ process at the first symbol after all symbols of the PUCCH or PUSCH carrying the HARQ feedback information are sent.
Step 6: when HARQ-RTT-TimerDL expires, if there is a Transport Block (TB) with decoding failure in the previous PDSCH, the terminal device starts DRX-retransmission TimerDL, and enters step 7 during DRX-retransmission TimerDL timing. If the previous PDSCH is decoded successfully, the terminal equipment does not start DRX-retransmission TimerDL.
And 7: during the DRX-retransmission timerdl timing, the terminal device is in an active state and starts blind detection of the PDCCH. And if the terminal equipment detects the retransmission DCI during the DRX-retransmission TimerDL timing period, closing the DRX-retransmission TimerDL and receiving the PDSCH based on the retransmission DCI. After decoding the PDSCH, steps 4 to 7 are performed.
Currently, the length of HARQ-RTT-TimerDL is configured by the network device. Specifically, the length of the HARQ-RTT-TimerDL is related to a time K3 when the network device processes the HARQ feedback information, where K3 indicates that the HARQ feedback information of a certain HARQ process sent from the terminal device is processed after being received from the network device, and the time for retransmitting data is determined.
Currently, a terminal device starts HARQ-RTT-TimerDL after all symbols of a PUCCH or a PUSCH carrying HARQ feedback information are transmitted, but this may cause HARQ-RTT-TimerDL start delay. For example, as shown in fig. 2 below, if the symbol carrying the HARQ feedback information is in the last symbol of the PUCCH or PUSCH, after the HARQ-RTT-TimerDL timeout, the terminal device may turn on DRX-retransmission TimerDL to bring the terminal device into the active state. In this case, the time when the terminal device starts the HARQ-RTT-TimerDL is substantially the same as the time when the network device starts to process the HARQ feedback information, so that the time when the terminal device starts the DRX-retransmission TimerDL timer is substantially the same as the time when the network device finishes processing the HARQ feedback information and prepares to send the indication to retransmit the DCI, and therefore, the network device may send the retransmit DCI to the terminal device after finishing processing the HARQ feedback information. However, if the symbols carrying the HARQ feedback information are some symbols beginning at the PUCCH or PUSCH, and the time domain length of the PUCCH or PUSCH carrying the HARQ feedback information is longer, as shown in fig. 3, the terminal device starts HARQ-RTT-TimerDL at time t1 when the last symbol of the PUCCH or PUSCH is transmitted, and starts DRX-retransmission TimerDL to enter the active state at time t2 when HARQ-RTT-TimerDL is out of time. And the network device starts to process the HARQ feedback information at time t3 after receiving all symbols carrying the HARQ feedback information. Because the time t1 is later than the time t3, that is, the time at which the terminal device starts the HARQ-RTT-TimerDL is later than the time at which the network device starts processing the HARQ feedback information, the HARQ-RTT-TimerDL at the terminal device side is not yet time out after the network device has processed the HARQ feedback information, at this time, if no other condition exists to make the terminal device in the active state, the network device needs to wait for the terminal device to start the DRX-retransmission TimerDL to enter the active state and then send the retransmission DCI to the terminal device, which causes the network device to additionally wait for the time duration of t1-t3, and thus the network device cannot schedule the retransmission DCI in time, resulting in an increase in data delay.
Based on this, embodiments of the present application provide a communication method and apparatus, so as to solve the problem that a network device cannot schedule a retransmission DCI in time, which results in an increase in data delay. In this embodiment of the present application, after the time of sending all symbols carrying the HARQ feedback information is completed, the terminal device may start a round trip time timer for the downlink hybrid automatic repeat request before the time of sending the last symbol of the physical uplink channel is completed, that is, start the HARQ-RTT-TimerDL at any time t4 between t3 and t1, so that the network device may reduce the delay of t1-t4, and may reduce the delay of data to a certain extent. The method and the device are based on the same inventive concept, and because the principles of solving the problems of the method and the device are similar, the implementation of the device and the method can be mutually referred, and repeated parts are not repeated.
The plurality of the embodiments of the present application means two or more.
In addition, it should be understood that the terms first, second, etc. in the description of the embodiments of the present application are used for distinguishing between the descriptions and not for indicating or implying relative importance or order.
The following describes a communication method provided in an embodiment of the present application in detail with reference to the drawings.
Referring to fig. 4, which is a flowchart of a communication method provided in the present application, the communication method provided in the present application may be used in a terminal device, or a chip in the terminal device, or a chip set on the terminal device, and the like. The following description takes the application of the method to a terminal device as an example, and the method includes:
s401, the terminal equipment sends a physical uplink channel to the network equipment, and the physical uplink channel carries HARQ feedback information. Wherein, the HARQ feedback information may include a decoding result of one or more TBs received in the PDSCH by the terminal device in one HARQ process. The HARQ feedback information may be TB-based ACK/NACK information, i.e., ACK indicates successful decoding of the corresponding TB, and NACK indicates failed decoding of the corresponding TB. The HARQ feedback information may also be ACK/NACK information based on a Code Block Group (CBG), that is, a TB is divided into a plurality of Code Blocks (CBs), and then the plurality of CB blocks are divided into a plurality of CBGs, where ACK in the HARQ feedback information indicates that all CBs in the corresponding CBG are successfully decoded, and NACK indicates that there is a CB in the corresponding CBG that has failed in decoding. A new transmission of data indicates the start of one HARQ process.
For example, the physical uplink channel may be a PUCCH, or may also be a PUSCH. The PUCCH may be configured to carry Uplink Control Information (UCI), and the uplink control information may include control information such as a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), a Rank Indicator (RI), and HARQ feedback information. The PUSCH may be used to carry uplink data and/or uplink control information.
S402, the terminal device starts a round trip time timer for a downlink hybrid automatic repeat request at a first time point, and during the time period of the round trip time timer for the downlink hybrid automatic repeat request, the terminal device is allowed not to monitor a physical downlink control channel, where the first time point is any time point in a first time period, a starting time of the first time period is a time T1 when all symbols bearing the HARQ feedback information are sent, and an ending time of the first time period is a time T2 when a last symbol of the physical uplink channel is sent. Here, the arbitrary time point may be T1 or T2. The HARQ-RTT-TimerDL is configured for the network device based on the time required for processing the HARQ feedback information process, and indicates that the network device does not immediately retransmit, so during the HARQ-RTT-TimerDL timing, the terminal device may be allowed to enter an inactive state, that is, the terminal device may not monitor the PDCCH.
In one implementation manner, the terminal device may start HARQ-RTT-TimerDL of a HARQ process corresponding to HARQ feedback information at any time point of T2-T1.
Illustratively, the terminal device may initiate HARQ-RTT-TimerDL when any one symbol is transmitted in the time period defined in T2-T1. For example, HARQ-RTT-TimerDL may be started when a first symbol after all symbols carrying the HARQ feedback information are sent, or HARQ-RTT-TimerDL may be started when a second symbol after all symbols carrying the HARQ feedback information are sent, or HARQ-RTT-TimerDL may be started when a fifth symbol after all symbols carrying the HARQ feedback information are sent, and the like, which is not specifically limited herein in this embodiment of the application.
For convenience of description, the following description will take HARQ-RTT-TimerDL initiated when the first symbol after all symbols carrying the HARQ feedback information are transmitted as an example.
For example, the terminal device may start the HARQ-RTT-TimerDL when transmitting a first symbol after a last symbol carrying the HARQ feedback information. That is, the first time point is the first symbol after the last symbol carrying the HARQ feedback information is sent.
In an exemplary illustration, if the HARQ feedback information is carried in one symbol, the terminal device starts the HARQ-RTT-TimerDL when transmitting a first symbol after the symbol carrying the HARQ feedback information. That is, the first time point is a first symbol after a symbol carrying the HARQ feedback information is sent.
Another exemplary illustration shows that, if the HARQ feedback information is carried in multiple symbols, the terminal device starts the HARQ-RTT-TimerDL when transmitting a first symbol after a last symbol carrying the HARQ feedback information. That is, the first time point is a first symbol after a last symbol carrying the HARQ feedback information is transmitted.
For better understanding of the embodiment of the present application, a downlink transmission process is specifically described in detail below with reference to a specific application scenario by taking, as an example, a network device configuring the length of the HARQ-RTT-TimerDL as the time required for processing HARQ feedback information.
Scene one: and the terminal equipment sends HARQ feedback information of a corresponding HARQ process to the network equipment on the PUCCH.
The downlink transmission process between the terminal device and the network device is shown in steps S501 to S507.
S501, the terminal device starts a DRX-onDuration timer when a certain condition is met, and monitors the PDCCH during the timing period of the DRX-onDuration timer.
S502, the terminal equipment starts a DRX-InactivetyTimer when detecting the PDCCH for indicating the downlink data to be newly transmitted.
S503, the terminal device decodes DCI in the PDCCH, and receives PDSCH based on the DCI.
S504, the terminal device carries the HARQ feedback information in the PUCCH and sends the HARQ feedback information to the network device. Wherein, the HARQ feedback information may include a decoding result of one or more TBs in the PDSCH.
And S505, the terminal equipment starts HARQ-RTT-TimerDL of the HARQ process at the first symbol after the terminal equipment sends the last symbol carrying the HARQ feedback information. The network device starts to process the HARQ feedback information after receiving the last symbol carrying the HARQ feedback information.
If the symbol carrying the HARQ feedback information is only one, starting the HARQ-RTT-TimerDL of the corresponding HARQ process at the first symbol after the symbol carrying the HARQ feedback information is sent.
And if the number of the symbols bearing the HARQ feedback information is multiple, starting HARQ-RTT-TimerDL corresponding to the HARQ process at the first symbol after the last symbol bearing the HARQ feedback information is sent.
S506, when the HARQ-RTT-TimerDL is out of time, if there is a data block with decoding failure in the PDSCH, the terminal device starts DRX-retransmission TimerDL, and performs step S507. The data block may be a TB, a CB, or a CBG.
If the PDSCH is decoded successfully, the terminal equipment does not start DRX-retransmission TimerDL.
Because the length of the HARQ-RTT-TimerDL is equal to the time required by the network device based on the process of processing the HARQ feedback information, after the network device processes the HARQ feedback information, the HARQ-RTT-TimerDL at the terminal device side basically finishes timing, that is, the terminal device enters an active state, so that the network device can send the retransmission DCI after processing the HARQ feedback information. As shown in fig. 5.
S507, during the DRX-retransmission TimerDL timing period, the terminal equipment is in an activated state and starts to perform blind detection on the PDCCH. And if the terminal equipment detects the retransmission DCI during the DRX-retransmission TimerDL timing period, closing the DRX-retransmission TimerDL and receiving the PDSCH based on the retransmission DCI.
After decoding the PDSCH, S504 to S507 may be continuously performed.
Scene two: and the terminal equipment sends HARQ feedback information of a corresponding HARQ process to the network equipment on a PUSCH. The scenario that the terminal device sends the HARQ feedback information of the corresponding HARQ process on the PUSCH may include slot overlapping of a single-slot PUCCH and a single-slot PUSCH, and slot overlapping of a single-slot PUCCH and a multi-slot PUSCH. When the single-slot PUCCH and the multi-slot PUSCH are overlapped in time slot, the terminal equipment sends HARQ feedback information on the PUSCH resource on the time slot where the PUSCH and the PUCCH are overlapped.
The downlink transmission process when the terminal device sends the HARQ feedback information of the corresponding HARQ process to the network device on the PUSCH is similar to the downlink transmission process when the terminal device sends the HARQ feedback information of the corresponding HARQ process to the network device on the PUCCH, and specific processes may refer to steps S501 to S507, which are not repeated here.
If there are one or more symbols bearing the HARQ feedback information on the PUSCH, the terminal device starts HARQ-RTT-TimerDL corresponding to the HARQ process when sending the first symbol after the last symbol bearing the HARQ feedback information. Because the length of the HARQ-RTT-TimerDL is equal to the time required by the network device based on the process of processing the HARQ feedback information, after the network device processes the HARQ feedback information, the HARQ-RTT-TimerDL at the terminal device side basically finishes timing, that is, the terminal device enters an active state, so that the network device can send the retransmission DCI after processing the HARQ feedback information. As shown in fig. 6.
When the HARQ feedback information is transmitted on the PUSCH, the HARQ feedback information may be carried in a symbol following a symbol in which a demodulation reference signal (DMRS) is located. If the additional DMRS exists on the PUSCH, the symbol after the symbol where the additional DMRS is located may also carry HARQ feedback information, so the terminal device may start the HARQ-RTT-TimerDL of the corresponding HARQ process when the next symbol of the symbol where the HARQ feedback information after the additional DMRS is located is sent. As shown in fig. 7.
If frequency hopping (frequency hopping) exists on the PUSCH, symbols after the symbol where the DMRS is located may carry HARQ feedback information on each frequency hopping, so that the terminal device may start HARQ-RTT-TimerDL of a corresponding HARQ process when a first symbol after all symbols carrying the HARQ feedback information are sent in the last frequency hopping. For example, if there are two frequency hops on the PUSCH, the terminal device may start HARQ-RTT-TimerDL corresponding to the HARQ process when the first symbol after the last symbol carrying the HARQ feedback information is sent in the second frequency hop. As shown in fig. 8.
Compared with the prior art that the network equipment starts to process the HARQ feedback information after receiving the HARQ feedback information, and the terminal equipment starts the HARQ-RTT-TimerDL timer after sending all symbols of the PUCCH or PUSCH carrying the HARQ feedback information, the terminal equipment in the embodiment of the application can start the HARQ-RTT-TimerDL timer at the first symbol after sending the symbol carrying the HARQ feedback information instead of finishing sending all symbols of the PUCCH or PUSCH, so that the delay of starting the DRX-retransmission TimerDL timer can be reduced, and the delay of entering the active state of the terminal equipment can be further reduced. Therefore, after the network device processes the HARQ feedback information, the time for waiting for the terminal device to enter the active state can be reduced, so that the DCI is scheduled and retransmitted in time, and the data delay can be reduced. For example, referring to fig. 3 and 5, it can be seen that the time delay of about t1-t3 can be reduced in the embodiment of the present application.
Secondly, in the embodiment of the present application, the terminal device may start the HARQ-RTT-TimerDL timer at a first symbol after the transmission of the symbol carrying the HARQ feedback information is completed, so that the HARQ-RTT-TimerDL timer may be better matched with the time for processing the HARQ feedback information by the network device, and thus the network device may set the size of the HARQ-RTT-TimerDL timer according to the time for processing the HARQ feedback information, thereby reducing the complexity of the system for configuring the size of the HARQ-RTT-TimerDL timer.
Based on the same inventive concept as the method embodiment, the present application provides a communication apparatus, which is specifically configured to implement the method described in the embodiments of fig. 4 to 8, where the apparatus may be the communication apparatus itself, or may be a chip or a chip set in the communication apparatus, or a part of the chip or the chip for performing the function of the related method. The communication apparatus may include a transmitting unit 901 and a processing unit 902, as shown in fig. 9. The sending unit 901 is configured to send a physical uplink channel to the network device, where the physical uplink channel carries HARQ feedback information. A processing unit 902, configured to start a HARQ round trip time timer at a first time point, and allow a terminal device not to monitor a physical downlink control channel during timing of the HARQ round trip time timer, where the first time point is any time point in a first time period, a starting time of the first time period is a time when all symbols bearing the HARQ feedback information are sent, and an ending time of the first time period is a time when a last symbol of the physical uplink channel is sent.
Exemplarily, the first time point is a first symbol after a last symbol carrying the HARQ feedback information is transmitted.
Specifically, if the HARQ feedback information is carried in one symbol, the first time point is a first symbol after the symbol carrying the HARQ feedback information is sent; if the HARQ feedback information is carried in multiple symbols, the first time point is a first symbol after a last symbol carrying the HARQ feedback information is sent.
For example, the physical uplink channel may be a physical uplink control channel or a physical uplink shared channel.
The division of the modules in the embodiments of the present application is schematic, and only one logical function division is provided, and in actual implementation, there may be another division manner, and in addition, each functional module in each embodiment of the present application may be integrated in one processor, may also exist alone physically, or may also be integrated in one module by two or more modules. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode.
When the integrated module can be implemented in the form of hardware, the communication device may be as shown in fig. 10, and the processing unit 902 may be a processor 1002. The processor 1002 may be a Central Processing Unit (CPU), a digital processing module, or the like. The transmitting unit 901 may be a communication interface 1001, and the communication interface 1001 may be a transceiver, an interface circuit such as a transceiver circuit, a transceiver chip, or the like. The communication device further includes: the memory 1003 is used for storing programs executed by the processor 1002. The memory 1003 may be a nonvolatile memory such as a Hard Disk Drive (HDD) or a solid-state drive (SSD), and may also be a volatile memory (RAM), for example, a random-access memory (RAM). The memory 1003 is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to such.
The processor 1002 is configured to execute the program code stored in the memory 1003, and is specifically configured to execute the actions of the processing unit 902, which is not described herein again.
In the embodiment of the present application, a specific connection medium among the communication interface 1001, the processor 1002, and the memory 1003 is not limited. In the embodiment of the present application, the memory 1003, the processor 1002, and the communication interface 1001 are connected by the bus 1004 in fig. 10, the bus is represented by a thick line in fig. 10, and the connection manner between the other components is merely illustrative and not limited. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 10, but this is not intended to represent only one bus or type of bus.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present application without departing from the spirit and scope of the embodiments of the present application. Thus, if such modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to encompass such modifications and variations.

Claims (11)

1. A method of communication, comprising:
sending a physical uplink channel to network equipment, wherein the physical uplink channel carries hybrid automatic repeat request (HARQ) feedback information;
starting a downlink hybrid automatic repeat request round trip time timer at a first time point, and allowing a terminal device not to monitor a physical downlink control channel during the time period of the downlink hybrid automatic repeat request round trip time timer, where the first time point is any time point in a first time period, the starting time of the first time period is the time when all symbols bearing the HARQ feedback information are sent, and the ending time of the first time period is the time when the last symbol of the physical uplink channel is sent.
2. The method of claim 1, wherein the first point in time is a first symbol after a last symbol carrying the HARQ feedback information is transmitted.
3. The method of claim 1 or 2, wherein if the HARQ feedback information is carried in one symbol, the first time point is a first symbol after the transmission of the symbol carrying the HARQ feedback information; or
If the HARQ feedback information is carried in multiple symbols, the first time point is a first symbol after a last symbol carrying the HARQ feedback information is sent.
4. A method according to any one of claims 1 to 3, wherein said physical uplink channel is a physical uplink control channel.
5. The method according to any of claims 1 to 3, wherein the physical uplink channel is a physical uplink shared channel.
6. A communications apparatus, comprising:
a sending unit, configured to send a physical uplink channel to a network device, where the physical uplink channel carries HARQ feedback information;
a processing unit, configured to start a HARQ round trip time timer at a first time point, and allow a terminal device not to monitor a physical downlink control channel during timing of the HARQ round trip time timer, where the first time point is any time point in a first time period, a start time of the first time period is a time when all symbols bearing the HARQ feedback information are sent, and an end time of the first time period is a time when a last symbol of the physical uplink channel is sent.
7. The apparatus of claim 6, wherein the first point in time is a first symbol after a last symbol carrying the HARQ feedback information is transmitted.
8. The apparatus of claim 6 or 7, wherein if the HARQ feedback information is carried in one symbol, the first time point is a first symbol after a symbol carrying the HARQ feedback information is transmitted; or
If the HARQ feedback information is carried in multiple symbols, the first time point is a first symbol after a last symbol carrying the HARQ feedback information is sent.
9. The apparatus according to any of claims 6 to 7, wherein the physical uplink channel is a physical uplink control channel.
10. The apparatus according to any of claims 6 to 9, wherein the physical uplink channel is a physical uplink shared channel.
11. A computer-readable storage medium, in which a program is stored, which when read and executed by one or more processors, implements the method of any one of claims 1 to 5.
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