CN114079543A - Feedback method, system and terminal for hybrid automatic repeat request - Google Patents
Feedback method, system and terminal for hybrid automatic repeat request Download PDFInfo
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- 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]
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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
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Abstract
The disclosure relates to a feedback method, a system and a terminal of a hybrid automatic repeat request, and relates to the technical field of communication. The method of the present disclosure comprises: a terminal receives downlink data sent by a base station in a current downlink time slot; the terminal generates a hybrid automatic repeat request HARQ acknowledgement/negative acknowledgement ACK/NACK message corresponding to the current downlink time slot according to the receiving condition of the downlink data of the current downlink time slot; the terminal carries out monitoring firstly and then sends LBT channel detection in the distributed authorization-free frequency band; and the terminal obtains an authorization-free frequency band feedback channel corresponding to the current downlink time slot under the condition that the LBT channel detection is successful, and sends the HARQ ACK/NACK message corresponding to the current downlink time slot to the base station through the authorization-free frequency band feedback channel corresponding to the current downlink time slot.
Description
Technical Field
The present disclosure relates to the field of communications technologies, and in particular, to a method, a system, and a terminal for feedback of a hybrid automatic repeat request.
Background
In the existing 5G time division duplex mobile communication system, the feedback of ACK/NACK (acknowledgement/negative acknowledgement) of HARQ (Hybrid Automatic Repeat Request) must wait until there is uplink transmission.
In order to reduce HARQ feedback delay, a Self-contained Subframe (Self-contained Subframe) is proposed in a URLLC (Ultra-reliable and Low Latency Communication) scenario, where one Subframe includes DL (downlink), UL (uplink) and GP (Guard Period). And downlink transmission and ACK/NACK feedback are completed in one subframe, so that HARQ feedback time delay can be greatly reduced.
Disclosure of Invention
The inventor finds that: although the self-contained subframe can reduce HARQ feedback delay, frequent uplink and downlink switching requires a large number of GP to be reserved, which causes resource waste and requires a large change to the existing frame structure.
One technical problem to be solved by the present disclosure is: how to reduce the HARQ feedback time delay and reduce the resource waste at the same time and keep the prior frame structure.
According to some embodiments of the present disclosure, a feedback method of a hybrid automatic repeat request is provided, including: a terminal receives downlink data sent by a base station in a current downlink time slot; the terminal generates a hybrid automatic repeat request HARQ acknowledgement/negative acknowledgement ACK/NACK message corresponding to the current downlink time slot according to the receiving condition of the downlink data of the current downlink time slot; the terminal carries out monitoring firstly and then sends LBT channel detection in the distributed authorization-free frequency band; and the terminal obtains an authorization-free frequency band feedback channel corresponding to the current downlink time slot under the condition that the LBT channel detection is successful, and sends the HARQ ACK/NACK message corresponding to the current downlink time slot to the base station through the authorization-free frequency band feedback channel corresponding to the current downlink time slot.
In some embodiments, the performing, by the terminal, LBT channel detection in the allocated unlicensed frequency band includes: the method comprises the steps that when an allocated unlicensed frequency band comprises a plurality of unlicensed frequency bands, a terminal simultaneously executes LBT channel detection in the plurality of unlicensed frequency bands; the method for obtaining the unlicensed frequency band feedback channel corresponding to the current downlink time slot by the terminal under the condition that the LBT channel detection is successful comprises the following steps: and under the condition that the LBT channel detection is successfully executed by the terminal in the multiple unlicensed frequency bands, selecting the channel in the unlicensed frequency band with the highest priority as the unlicensed frequency band feedback channel corresponding to the current downlink time slot according to the priority of each unlicensed frequency band.
In some embodiments, the performing, by the terminal, LBT channel detection in the allocated unlicensed frequency band includes: and the terminal executes LBT channel detection in each unlicensed frequency band in sequence from high to low according to the priority of each unlicensed frequency band under the condition that the allocated unlicensed frequency band comprises a plurality of unlicensed frequency bands until the LBT channel detection is successful or all unlicensed frequency bands execute the LBT channel detection.
In some embodiments, the method further comprises: and under the condition that the LBT channel detection fails, the terminal determines the opportunity for re-executing the LBT channel detection in the distributed unlicensed frequency band according to the configured LBT type.
In some embodiments, the determining, by the terminal, the timing for performing LBT channel detection again in the allocated unlicensed frequency band according to the configured LBT type includes: and the terminal determines to receive downlink data sent by the next downlink time slot and generate HARQ ACK/NACK information corresponding to the next downlink time slot under the condition that the configured LBT type is a backoff-free LBT mechanism, and then executes LBT channel detection in the allocated unlicensed frequency band.
In some embodiments, the method further comprises: after generating the HARQ ACK/NACK message corresponding to the next downlink time slot, the terminal obtains the feedback channel of the unlicensed frequency band corresponding to the next downlink time slot under the condition that the LBT channel detection is successfully executed in the allocated unlicensed frequency band, and sends the HARQ ACK/NACK message corresponding to the current downlink time slot and the HARQ ACK/NACK message corresponding to the next downlink time slot to the base station through the feedback channel of the unlicensed frequency band corresponding to the next downlink time slot.
In some embodiments, the determining, by the terminal, the timing for performing LBT channel detection again in the allocated unlicensed frequency band according to the configured LBT type includes: and the terminal re-executes the LBT channel detection in the distributed unlicensed frequency band after the time of the contention window is finished under the condition that the configured LBT type is a random backoff type LBT mechanism for executing the contention window to be fixed or a random backoff type LBT mechanism for executing the contention window to be variable.
In some embodiments, after the contention window time is over, the terminal performing LBT channel detection again in the allocated unlicensed frequency band includes: the terminal determines whether the time when the contention window ends is earlier than the time when downlink data sent by the next downlink time slot is received and HARQ ACK/NACK information corresponding to the next downlink time slot is generated; if the time when the contention window is finished is earlier than the time when downlink data sent by the next downlink time slot is received and HARQ ACK/NACK information corresponding to the next downlink time slot is generated, performing LBT channel detection again in the distributed authorization-free frequency band after the contention window time is finished; and if the time when the contention window is finished is later than the time when the downlink data sent by the next downlink time slot is received and the HARQ ACK/NACK message corresponding to the next downlink time slot is generated, after the downlink data sent by the next downlink time slot is received and the HARQ ACK/NACK message corresponding to the next downlink time slot is generated, the LBT channel detection is executed in the allocated authorization-free frequency band.
In some embodiments, the method further comprises: and the terminal selects the nearest uplink time slot on the authorized frequency band under the condition that the LBT channel detection continuous failure times reach a threshold value, and sends HARQ ACK/NACK messages corresponding to all downlink time slots before the uplink time slot to the base station through the uplink time slot.
In some embodiments, the performing, by the terminal, LBT channel detection in the allocated unlicensed frequency band includes: the terminal judges whether an uplink time slot of an authorized frequency band exists in preset time after the HARQ ACK/NACK message corresponding to the current downlink time slot is generated; if the uplink time slot of the authorized frequency band exists, the HARQ ACK/NACK message corresponding to the current downlink time slot is sent to the base station through the uplink time slot; and if the uplink time slot of the authorized frequency band does not exist, carrying out LBT channel detection on the distributed unlicensed frequency band.
In some embodiments, the method further comprises: and under the condition that the HARQ ACK/NACK message is a NACK message, the terminal receives downlink data retransmitted by the base station, and the downlink time slot retransmitted by the downlink data is the nearest downlink time slot after the NACK message is received by the base station.
According to further embodiments of the present disclosure, there is provided a terminal including: a receiving module, configured to receive downlink data sent by a base station in a current downlink timeslot; a message generating module, configured to generate a hybrid automatic repeat request HARQ acknowledgement/negative acknowledgement ACK/NACK message corresponding to a current downlink timeslot according to a receiving condition of downlink data of the current downlink timeslot; the detection module is used for monitoring and then sending LBT channel detection in the distributed unlicensed frequency band; and the sending module is used for obtaining an authorization-free frequency band feedback channel corresponding to the current downlink time slot under the condition that the LBT channel is successfully detected, and sending the HARQ ACK/NACK message corresponding to the current downlink time slot to the base station through the authorization-free frequency band feedback channel corresponding to the current downlink time slot.
According to still other embodiments of the present disclosure, there is provided a terminal including: a processor; and a memory coupled to the processor for storing instructions that, when executed by the processor, cause the processor to perform a hybrid automatic repeat request feedback method as in any of the preceding embodiments.
According to still further embodiments of the present disclosure, there is provided a non-transitory computer readable storage medium having stored thereon a computer program, wherein the program when executed by a processor implements the hybrid automatic repeat request feedback method of any of the preceding embodiments.
According to still other embodiments of the present disclosure, a feedback system for hybrid automatic repeat request is provided, which includes: the terminal of any of the preceding embodiments; and the base station is used for receiving the HARQ ACK/NACK message corresponding to the current downlink time slot sent by the terminal according to the downlink data sent to the terminal in the current downlink time slot.
In some embodiments, the base station is further configured to select a latest downlink timeslot to retransmit the downlink data if the received HARQ ACK/NACK message is a NACK message.
In the disclosure, after receiving downlink data sent by a base station in a current downlink time slot, a terminal generates an HARQ ACK/NACK message corresponding to the current downlink time slot. And the terminal executes LBT channel detection on the allocated authorization-free frequency band, if the detection is successful, an authorization-free frequency band feedback channel corresponding to the current downlink time slot is obtained, and HARQ ACK/NACK information corresponding to the current downlink time slot is sent to the base station through the authorization-free frequency band feedback channel corresponding to the current downlink time slot. According to the method and the device, after the terminal receives downlink data at each downlink time slot, HARQ ACK/NACK information can be fed back through the unlicensed frequency band quickly, HARQ feedback does not need to be carried out when the terminal waits for the uplink time slot, HARQ feedback time delay is reduced, the existing frame structure does not need to be changed, and meanwhile resource waste can be reduced.
Other features of the present disclosure and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 illustrates a flow diagram of a feedback method of hybrid automatic repeat request of some embodiments of the present disclosure.
Fig. 2 shows a flow diagram of a feedback method of hybrid automatic repeat request according to further embodiments of the present disclosure.
Fig. 3 illustrates a schematic diagram of a feedback method of hybrid automatic repeat request of some embodiments of the present disclosure.
Fig. 4 illustrates a schematic structural diagram of a terminal of some embodiments of the present disclosure.
Fig. 5 shows a schematic structural diagram of a terminal of further embodiments of the present disclosure.
Fig. 6 shows a schematic structural diagram of a terminal according to further embodiments of the present disclosure.
Fig. 7 illustrates a schematic structural diagram of a feedback system of a hybrid automatic repeat request according to some embodiments of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
The present disclosure provides a feedback method of hybrid automatic repeat request, which is described below with reference to fig. 1 to 3.
Fig. 1 is a flow chart of some embodiments of a feedback method for harq according to the present disclosure. As shown in fig. 1, the method of this embodiment includes: steps S102 to S108.
In step S102, the terminal receives downlink data transmitted by the base station in the current downlink timeslot.
The radio frame duration is fixed 10ms, each radio frame comprises 10 subframes, and the length of each subframe is 1 ms. A slot length is flexible and currently a slot length of 0.5ms is mainly used. The time slot in this disclosure may be understood as the smallest time unit in a TDD radio frame that distinguishes different transmission functions. The downlink time slot is a time slot capable of transmitting downlink data, and includes a special time slot capable of transmitting downlink data.
In step S104, the terminal generates an HARQ ACK/NACK message corresponding to the current downlink timeslot according to the receiving condition of the downlink data of the current downlink timeslot.
If the terminal successfully receives the downlink data of the current downlink time slot, an ACK message is generated, otherwise, a NACK message is generated, and the specific method for generating the ACK/NACK message refers to the prior art and is not repeated.
In step S106, the terminal performs LBT (Listen Before Talk, transmit first) channel detection in the allocated unlicensed band.
The base station may allocate one or more licensed frequency bands and one or more unlicensed frequency bands to the terminal. In some embodiments, the terminal performs LBT channel detection in multiple unlicensed frequency bands simultaneously in the case that the allocated unlicensed frequency band includes multiple unlicensed frequency bands. Or, under the condition that the distributed unlicensed frequency band comprises a plurality of unlicensed frequency bands, the terminal sequentially executes LBT channel detection in each unlicensed frequency band according to the sequence of the priority of each unlicensed frequency band from high to low until the LBT channel detection is successful or all unlicensed frequency bands execute LBT channel detection.
The terminal performs LBT channel detection on multiple unlicensed frequency bands simultaneously, which may improve detection efficiency, but may result in an increase in power consumption of the terminal. The terminal performs LBT channel detection on each unlicensed frequency band in sequence, which may reduce power consumption but may reduce detection efficiency. The priority of each unlicensed frequency band may be predetermined. The probability of successful detection of the LBT channel can be improved by allocating a plurality of unlicensed frequency bands for the terminal.
In step S108, the terminal obtains the unlicensed frequency band feedback channel corresponding to the current downlink timeslot under the condition that the LBT channel detection is successful, and sends the HARQ ACK/NACK message corresponding to the current downlink timeslot to the base station through the unlicensed frequency band feedback channel corresponding to the current downlink timeslot.
For LBT channel detection, occupying channel resources may refer to the prior art, and will not be described herein. If the terminal can successfully detect the LBT channel after receiving the downlink data sent by each downlink time slot, the HARQ feedback can be carried out on the downlink data sent by each downlink time slot in time through the unlicensed frequency band, and the HARQ feedback efficiency is improved.
And under the condition that the terminal executes LBT channel detection in a plurality of unlicensed frequency bands simultaneously, if the terminal executes LBT channel detection in the plurality of unlicensed frequency bands successfully, selecting a channel in the unlicensed frequency band with the highest priority as an unlicensed frequency band feedback channel corresponding to the current downlink time slot according to the priority of each unlicensed frequency band.
In the above embodiment, after receiving the downlink data sent by the base station in the current downlink time slot, the terminal generates the HARQ ACK/NACK message corresponding to the current downlink time slot. And the terminal executes LBT channel detection on the allocated authorization-free frequency band, if the detection is successful, an authorization-free frequency band feedback channel corresponding to the current downlink time slot is obtained, and HARQ ACK/NACK information corresponding to the current downlink time slot is sent to the base station through the authorization-free frequency band feedback channel corresponding to the current downlink time slot. In the above embodiment, after receiving downlink data in each downlink time slot, the terminal can quickly feed back HARQ ACK/NACK messages through the unlicensed frequency band, and does not need to wait for uplink time slot to perform HARQ feedback, thereby reducing HARQ feedback delay, and also reducing resource waste without changing the existing frame structure.
The terminal may fail to perform LBT channel detection. In some embodiments, the terminal determines, according to the configured LBT type, an occasion to perform LBT channel detection again in the allocated unlicensed frequency band when LBT channel detection fails.
Four LBT types are specified in the 3GPP standards, Cat 1 (type 1): no CCA detection is performed before data transmission; a Cat 2: an LBT mechanism without random backoff is adopted; cat 3: a random backoff type LBT mechanism with a fixed contention window; a Cat 4: a random backoff type LBT mechanism with a variable contention window. The terminal can be configured with an LBT mechanism of Cat 2-4 in an unlicensed frequency band. The specific mechanism can refer to the existing standard and is not described in detail
In some embodiments, when the configured LBT type is an LBT mechanism without backoff, the terminal determines that downlink data sent by the next downlink timeslot is received and generates an HARQ ACK/NACK message corresponding to the next downlink timeslot, and then performs LBT channel detection in the allocated unlicensed frequency band. And under the condition that the LBT type is Cat 2, if the LBT channel detection fails, the terminal gives up the feedback, namely gives up the detection of the feedback channel of the unlicensed frequency band corresponding to the current downlink time slot, and triggers the execution of the LBT channel detection after waiting for the generation of the HARQ ACK/NACK message corresponding to the next downlink time slot.
In some embodiments, after generating the HARQ ACK/NACK message corresponding to the next downlink timeslot, the terminal obtains an unlicensed frequency band feedback channel corresponding to the next downlink timeslot under the condition that LBT channel detection is successfully performed in the allocated unlicensed frequency band, and sends the HARQ ACK/NACK message corresponding to the current downlink timeslot and the HARQ ACK/NACK message corresponding to the next downlink timeslot to the base station through the unlicensed frequency band feedback channel corresponding to the next downlink timeslot.
The terminal only performs one round of LBT channel detection on downlink data sent by each downlink timeslot under the condition that the configured LBT type is an backoff-free LBT mechanism, where the one round of LBT channel detection may include LBT channel detection on multiple unlicensed frequency bands. And if the LBT channel detection is not successful, waiting for the downlink data reception of the next downlink time slot and generating the HARQ ACK/NACK message corresponding to the next downlink time slot, and then re-executing the LBT channel detection. And sending the HARQ ACK/NACK message corresponding to each previous downlink time slot to the base station through the unlicensed frequency band until the LBT channel detection is successful.
In some embodiments, the terminal performs LBT channel detection again in the allocated unlicensed frequency band after the contention window time ends, when the configured LBT type is the random backoff type LBT mechanism for performing contention window fixing or the random backoff type LBT mechanism for performing contention window varying.
The terminal can execute multiple rounds of LBT channel detection aiming at the downlink data sent by each downlink time slot under the condition that the configured LBT type is a random backoff type LBT mechanism for executing the fixed contention window or a random backoff type LBT mechanism for executing the variable contention window, and if one round of LBT channel detection is unsuccessful, the LBT channel detection is executed again after waiting for the end of the contention window time. In this case, a problem may occur that, in the process of performing LBT channel detection on downlink data transmitted by a current downlink timeslot, downlink data of a next downlink timeslot already reaches a terminal, and after the terminal generates an HARQ ACK/NACK message corresponding to the next downlink timeslot, LBT channel detection needs to be performed on the downlink data of the next downlink timeslot, so that the LBT channel detections corresponding to two downlink timeslots collide.
One solution to the above problem is, for example: the terminal determines whether the time when the contention window ends is earlier than the time when downlink data sent by the next downlink time slot is received and HARQ ACK/NACK information corresponding to the next downlink time slot is generated; if the time when the contention window is finished is earlier than the time when downlink data sent by the next downlink time slot is received and HARQ ACK/NACK information corresponding to the next downlink time slot is generated, performing LBT channel detection again in the distributed authorization-free frequency band after the contention window time is finished; and if the time when the contention window is finished is later than the time when the downlink data sent by the next downlink time slot is received and the HARQ ACK/NACK message corresponding to the next downlink time slot is generated, after the downlink data sent by the next downlink time slot is received and the HARQ ACK/NACK message corresponding to the next downlink time slot is generated, the LBT channel detection is executed in the allocated authorization-free frequency band.
That is, the terminal judges the end time of the contention window before each round of LBT channel detection, if the end time is earlier than the time of generating the HARQ ACK/NACK message corresponding to the next downlink time slot, the LBT channel detection is executed again after the end time of the contention window, and if the end time is later than the time of generating the HARQ ACK/NACK message corresponding to the next downlink time slot, the LBT channel detection is executed after the HARQ ACK/NACK message corresponding to the next downlink time slot is generated. The terminal can also judge whether the time when the contention window ends is earlier than the time when the HARQ ACK/NACK message corresponding to the next downlink time slot is generated and whether the time difference between the time when the contention window ends and the time when the HARQ ACK/NACK message corresponding to the next downlink time slot is generated reaches a preset value, if the time when the contention window ends is earlier than the preset value and reaches the preset value, the LBT channel detection is executed again, otherwise, the LBT channel detection is executed after the HARQ ACK/NACK message corresponding to the next downlink time slot is generated. The time for the terminal to receive the downlink data and generate the ACK/NACK message may be obtained statistically.
Another solution to the above problem is, for example: and after the contention window time is finished, the terminal re-executes the LBT channel detection in the allocated authorization-free frequency band, if the HARQ ACK/NACK message corresponding to the next downlink time slot is generated in the contention window time, the new LBT channel detection is not triggered, and under the condition that the LBT channel detection is successful, the HARQ ACK/NACK message corresponding to each time slot before the LBT channel detection is successful is sent to the base station through the authorization-free frequency band.
The unlicensed frequency band allocated by the terminal can be combined with the uplink time slot of the licensed frequency band to be applied, so that the HARQ feedback efficiency is improved. In some embodiments, the terminal selects the nearest uplink timeslot on the authorized frequency band when the number of consecutive failures of LBT channel detection reaches a threshold, and sends HARQ ACK/NACK messages corresponding to each downlink timeslot before the uplink timeslot to the base station through the uplink transmission timeslot.
In some embodiments, the terminal determines whether an uplink time slot of an authorized frequency band exists within a preset time after generating the HARQ ACK/NACK message corresponding to the current downlink time slot; if the uplink time slot of the authorized frequency band exists, the HARQ ACK/NACK message corresponding to the current downlink time slot is sent to the base station through the uplink time slot; and if the uplink time slot of the authorized frequency band does not exist, carrying out LBT channel detection on the distributed unlicensed frequency band.
If the uplink time slot of the authorized frequency band exists in the preset time (shorter time) after the terminal generates the HARQ ACK/NACK message corresponding to the current downlink time slot, the uplink time slot is directly utilized for HARQ feedback, the LBT channel detection of the unlicensed frequency band is reduced, the power consumption of the terminal is reduced, and the feedback efficiency is improved.
In the following, in conjunction with the above embodiments, the feedback method of the hybrid automatic repeat request of the present disclosure is described with reference to fig. 2
Fig. 2 is a flow chart of other embodiments of a feedback method for harq according to the present disclosure. As shown in fig. 2, the method of this embodiment includes: steps S202 to S215.
In step S202, the terminal receives downlink data transmitted by the base station in the current downlink timeslot.
In step S204, the terminal generates an HARQ ACK/NACK message corresponding to the current downlink timeslot according to the receiving condition of the downlink data of the current downlink timeslot.
In step S206, the terminal determines whether there is an uplink timeslot of the licensed frequency band within a preset time, if so, step S207 is executed, otherwise, step S208 is executed.
In step S207, the terminal sends HARQ ACK/NACK message corresponding to the current downlink slot to the base station through the uplink slot.
In step S208, the terminal performs LBT channel detection in the allocated unlicensed frequency band, and if the LBT channel detection is successful, performs step S209, otherwise performs step S210.
In step S209, the terminal sends HARQ ACK/NACK messages corresponding to the unsent downlink timeslots to the base station through the unlicensed frequency band feedback channel.
The HARQ ACK/NACK message corresponding to each unsent downlink time slot comprises the following steps: and HARQ ACK/NACK information corresponding to the current downlink time slot.
In step S210, the terminal determines whether the number of consecutive failures of LBT channel detection reaches a threshold, if so, performs step S211, otherwise, performs step S212.
In step S211, the terminal selects the nearest uplink timeslot on the authorized frequency band, and transmits HARQ ACK/NACK messages corresponding to each downlink timeslot before the uplink timeslot to the base station through the uplink timeslot.
In step S212, the terminal determines the configured LBT type, if the LBT type is the back-off-free LBT mechanism (i.e., type 2), then step S213 is performed, and if the LBT type is the random back-off type LBT mechanism performing contention window fixing or the random back-off type LBT mechanism performing contention window varying (i.e., type 3 and type 4), step S214 is performed.
In step S213, the terminal waits for the next downlink timeslot to arrive, takes the next downlink timeslot as the current downlink timeslot, and returns to step S202 to resume execution.
In step S214, the terminal determines whether the time when the contention window ends is earlier than the time when the downlink data transmitted in the next downlink timeslot is received and the HARQ ACK/NACK message corresponding to the next downlink timeslot is generated, if so, step S215 is performed, otherwise, step S213 is performed.
In step S215, the terminal waits for the contention window time to end, and returns to step S208 to resume execution.
In some embodiments, when the HARQ ACK/NACK message is a NACK message, the terminal receives downlink data retransmitted by the base station, and a downlink timeslot for the retransmission of the downlink data is a closest downlink timeslot after the base station receives the NACK message. That is, if the base station receives the NACK message sent by the terminal, the base station may select the best downlink timeslot to retransmit the corresponding data.
An application example of the feedback method of the hybrid automatic repeat request of the present disclosure is described below with reference to fig. 3.
As shown in fig. 3, which is a 2.5ms bi-periodic frame structure, each Slot is 0.5ms, D denotes a downlink Slot, U denotes an uplink Slot, and S denotes a special Slot. The terminal receives the downlink data and has a certain time delay from the beginning of the LBT channel detection. After receiving the downlink data of the Slot0, the terminal successfully performs the LBT channel detection in the unlicensed frequency band, and then performs HARQ feedback in the unlicensed frequency band. After receiving the downlink data of the Slot1, the terminal fails to perform LBT channel detection in the unlicensed frequency band, and if the LBT type is type 1, the terminal delays to the next time and sends the LBT channel detection success together with HARQ information corresponding to the Slot 2. After the terminal receives the downlink data of the Slot7, since the uplink time Slot is stored in a short time later, the terminal can select the uplink time Slot in the authorized frequency band to perform ACK/NACK feedback.
The present disclosure also provides a terminal, described below in conjunction with fig. 4.
Fig. 4 is a block diagram of some embodiments of the terminal of the present disclosure. As shown in fig. 4, the terminal 40 of this embodiment includes: a receiving module 410, a message generating module 420, a detecting module 430 and a sending module 440.
A receiving module 410, configured to receive downlink data sent by the base station in the current downlink timeslot.
In some embodiments, the receiving module 410 is configured to receive downlink data retransmitted by the base station when the HARQ ACK/NACK message is a NACK message, where a downlink timeslot for the downlink data retransmission is a closest downlink timeslot after the base station receives the NACK message.
A message generating module 420, configured to generate a hybrid automatic repeat request HARQ acknowledgement/negative acknowledgement ACK/NACK message corresponding to the current downlink timeslot according to a receiving condition of downlink data of the current downlink timeslot.
A detecting module 430, configured to perform listen before send LBT channel detection in the allocated unlicensed frequency band.
In some embodiments, the detecting module 430 is configured to, when the allocated unlicensed frequency band includes multiple unlicensed frequency bands, sequentially perform LBT channel detection on each unlicensed frequency band according to a sequence of priorities of the unlicensed frequency bands from high to low until the LBT channel detection is successful or all the unlicensed frequency bands perform LBT channel detection.
In some embodiments, the detecting module 430 is configured to determine, according to the configured LBT type, an occasion to perform LBT channel detection again in the allocated unlicensed frequency band in case of LBT channel detection failure.
In some embodiments, the detection module 430 is configured to determine whether an uplink timeslot of an authorized frequency band exists within a preset time after the HARQ ACK/NACK message corresponding to the current downlink timeslot is generated; if the uplink time slot of the authorized frequency band exists, the notification sending module 440 sends the HARQ ACK/NACK message corresponding to the current downlink time slot to the base station through the uplink time slot; and if the uplink time slot of the authorized frequency band does not exist, carrying out LBT channel detection on the distributed unlicensed frequency band.
A sending module 440, configured to obtain an unlicensed frequency band feedback channel corresponding to the current downlink time slot when the LBT channel is successfully detected, and send, to the base station, the HARQ ACK/NACK message corresponding to the current downlink time slot through the unlicensed frequency band feedback channel corresponding to the current downlink time slot.
In some embodiments, the detection module 430 is configured to perform LBT channel detection in multiple unlicensed frequency bands simultaneously if the allocated unlicensed frequency band includes multiple unlicensed frequency bands. The sending module 440 is configured to, when the LBT channel detection is successfully performed in the multiple unlicensed frequency bands, select a channel in the unlicensed frequency band with the highest priority as an unlicensed frequency band feedback channel corresponding to the current downlink timeslot according to the priority of each unlicensed frequency band.
In some embodiments, the detecting module 430 is configured to, when the configured LBT type is an LBT mechanism without backoff, determine that downlink data sent by a next downlink timeslot is received and generate a HARQ ACK/NACK message corresponding to the next downlink timeslot, and then perform LBT channel detection in the allocated unlicensed frequency band. The sending module 440 is configured to, after generating the HARQ ACK/NACK message corresponding to the next downlink time slot, obtain an unlicensed frequency band feedback channel corresponding to the next downlink time slot under the condition that the LBT channel detection is successfully performed in the allocated unlicensed frequency band, and send the HARQ ACK/NACK message corresponding to the current downlink time slot and the HARQ ACK/NACK message corresponding to the next downlink time slot to the base station through the unlicensed frequency band feedback channel corresponding to the next downlink time slot.
In some embodiments, the detecting module 430 is configured to, when the configured LBT type is a random backoff type LBT mechanism that performs contention window fixing or a random backoff type LBT mechanism that performs contention window varying, the terminal performs LBT channel detection again in the allocated unlicensed frequency band after the contention window time ends.
In some embodiments, the detecting module 430 is configured to determine whether a time when the contention window ends is earlier than a time when downlink data sent by a next downlink timeslot is received and a HARQ ACK/NACK message corresponding to the next downlink timeslot is generated; if the time when the contention window is finished is earlier than the time when downlink data sent by the next downlink time slot is received and HARQ ACK/NACK information corresponding to the next downlink time slot is generated, performing LBT channel detection again in the distributed authorization-free frequency band after the contention window time is finished; and if the time when the contention window is finished is later than the time when the downlink data sent by the next downlink time slot is received and the HARQ ACK/NACK message corresponding to the next downlink time slot is generated, after the downlink data sent by the next downlink time slot is received and the HARQ ACK/NACK message corresponding to the next downlink time slot is generated, the LBT channel detection is executed in the allocated authorization-free frequency band.
In some embodiments, the sending module 440 is configured to, when the number of consecutive failures of LBT channel detection reaches a threshold, select a nearest uplink timeslot on the authorized frequency band, and send HARQ ACK/NACK messages corresponding to each downlink timeslot before the uplink timeslot to the base station through the uplink timeslot.
The terminals in the embodiments of the present disclosure may each be implemented by various computing devices or computer systems, which are described below in conjunction with fig. 5 and 6.
Fig. 5 is a block diagram of some embodiments of the terminal of the present disclosure. As shown in fig. 5, the terminal 50 of this embodiment includes: a memory 510 and a processor 520 coupled to the memory 510, the processor 520 configured to perform a hybrid automatic repeat request feedback method in any of the embodiments of the present disclosure based on instructions stored in the memory 510.
Fig. 6 is a block diagram of further embodiments of the terminal of the present disclosure. As shown in fig. 6, the terminal 60 of this embodiment includes: memory 610 and processor 60 are similar to memory 510 and processor 520, respectively. An input output interface 630, a network interface 540, a storage interface 650, and the like may also be included. These interfaces 630, 640, 650 and the connections between the memory 610 and the processor 620 may be, for example, via a bus 660. The input/output interface 630 provides a connection interface for input/output devices such as a display, a mouse, a keyboard, and a touch screen. The network interface 640 provides a connection interface for various networking devices, such as a database server or a cloud storage server. The storage interface 650 provides a connection interface for external storage devices such as an SD card and a usb disk.
The present disclosure also provides a feedback system of hybrid automatic repeat request, which is described below with reference to fig. 7.
Fig. 7 is a block diagram of some embodiments of a hybrid automatic repeat request feedback system of the present disclosure. As shown in fig. 7, the system 7 of this embodiment includes: terminal 40/50/60 of any of the preceding embodiments, and base station 72.
The base station 72 is configured to receive, at the current downlink timeslot, the HARQ ACK/NACK message corresponding to the current downlink timeslot sent by the terminal 40/50/60 for the downlink data sent to the terminal 40/50/60.
In some embodiments, the base station 72 is configured to select the latest downlink timeslot to retransmit the downlink data if the received HARQ ACK/NACK message is a NACK message.
As will be appreciated by one skilled in the art, embodiments of the present disclosure may be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more computer-usable non-transitory 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 disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the disclosure. 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.
The above description is only exemplary of the present disclosure and is not intended to limit the present disclosure, so that any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.
Claims (16)
1. A feedback method of hybrid automatic repeat request (HARQ) comprises the following steps:
a terminal receives downlink data sent by a base station in a current downlink time slot;
the terminal generates a hybrid automatic repeat request HARQ acknowledgement/negative acknowledgement ACK/NACK message corresponding to the current downlink time slot according to the receiving condition of the downlink data of the current downlink time slot;
the terminal carries out monitoring before sending LBT channel detection in the distributed authorization-free frequency band;
and the terminal obtains an authorization-free frequency band feedback channel corresponding to the current downlink time slot under the condition that the LBT channel detection is successful, and sends the HARQ ACK/NACK message corresponding to the current downlink time slot to the base station through the authorization-free frequency band feedback channel corresponding to the current downlink time slot.
2. The feedback method of claim 1, wherein the terminal performing LBT channel detection in the allocated unlicensed band comprises:
the terminal executes LBT channel detection in a plurality of unlicensed frequency bands simultaneously under the condition that the distributed unlicensed frequency bands comprise the plurality of unlicensed frequency bands;
the obtaining, by the terminal, an unlicensed frequency band feedback channel corresponding to the current downlink timeslot when the LBT channel is successfully detected includes:
and under the condition that the LBT channel detection is successfully executed in a plurality of unlicensed frequency bands, the terminal selects a channel in the unlicensed frequency band with the highest priority as an unlicensed frequency band feedback channel corresponding to the current downlink time slot according to the priority of each unlicensed frequency band.
3. The feedback method of claim 1, wherein the terminal performing LBT channel detection in the allocated unlicensed band comprises:
and the terminal executes LBT channel detection in each unlicensed frequency band in sequence from high to low according to the priority of each unlicensed frequency band under the condition that the allocated unlicensed frequency band comprises a plurality of unlicensed frequency bands until the LBT channel detection is successful or all unlicensed frequency bands execute the LBT channel detection.
4. The feedback method of claim 1, further comprising:
and the terminal determines the opportunity for re-executing the LBT channel detection in the allocated unlicensed frequency band according to the configured LBT type under the condition that the LBT channel detection fails.
5. The feedback method of claim 4, wherein the determining, by the terminal according to the configured LBT type, the timing for performing LBT channel detection again in the allocated unlicensed frequency band comprises:
and the terminal determines to receive downlink data sent by the next downlink time slot and generate HARQ ACK/NACK information corresponding to the next downlink time slot under the condition that the configured LBT type is a backoff-free LBT mechanism, and then executes LBT channel detection in the allocated authorization-free frequency band.
6. The feedback method of claim 5, further comprising:
after generating the HARQ ACK/NACK message corresponding to the next downlink time slot, the terminal obtains the feedback channel of the unlicensed frequency band corresponding to the next downlink time slot under the condition that the LBT channel detection is successfully executed in the allocated unlicensed frequency band, and sends the HARQ ACK/NACK message corresponding to the current downlink time slot and the HARQ ACK/NACK message corresponding to the next downlink time slot to the base station through the feedback channel of the unlicensed frequency band corresponding to the next downlink time slot.
7. The feedback method of claim 4, wherein the determining, by the terminal according to the configured LBT type, the timing for performing LBT channel detection again in the allocated unlicensed frequency band comprises:
and under the condition that the configured LBT type is a random backoff type LBT mechanism for executing the fixed contention window or a random backoff type LBT mechanism for executing the variable contention window, the terminal executes the LBT channel detection again in the distributed unlicensed frequency band after the contention window time is over.
8. The feedback method of claim 7, wherein the terminal performing LBT channel detection again in the allocated unlicensed band after the contention window time is over comprises:
the terminal determines whether the time when the contention window ends is earlier than the time when downlink data sent by the next downlink time slot is received and HARQ ACK/NACK information corresponding to the next downlink time slot is generated;
if the time when the contention window is finished is earlier than the time when downlink data sent by the next downlink time slot is received and HARQ ACK/NACK information corresponding to the next downlink time slot is generated, performing LBT channel detection again in the distributed authorization-free frequency band after the contention window time is finished;
and if the time when the contention window is finished is later than the time when the downlink data sent by the next downlink time slot is received and the HARQ ACK/NACK message corresponding to the next downlink time slot is generated, after the downlink data sent by the next downlink time slot is received and the HARQ ACK/NACK message corresponding to the next downlink time slot is generated, the LBT channel detection is executed in the allocated authorization-free frequency band.
9. The feedback method of claim 4, further comprising:
and the terminal selects the nearest uplink time slot on the authorized frequency band under the condition that the LBT channel detection continuous failure times reach a threshold value, and sends HARQ ACK/NACK messages corresponding to all downlink time slots before the uplink time slot to the base station through the uplink time slot.
10. The feedback method of claim 1, wherein the terminal performing LBT channel detection in the allocated unlicensed band comprises:
the terminal judges whether an uplink time slot of an authorized frequency band exists in preset time after the HARQ ACK/NACK message corresponding to the current downlink time slot is generated;
if the uplink time slot of the authorized frequency band exists, the HARQ ACK/NACK message corresponding to the current downlink time slot is sent to the base station through the uplink time slot;
and if the uplink time slot of the authorized frequency band does not exist, carrying out LBT channel detection on the distributed unlicensed frequency band.
11. The feedback method of claim 1, further comprising:
and under the condition that the HARQ ACK/NACK message is a NACK message, the terminal receives downlink data retransmitted by the base station, and the downlink time slot retransmitted by the downlink data is the nearest downlink time slot after the NACK message is received by the base station.
12. A terminal, comprising:
a receiving module, configured to receive downlink data sent by a base station in a current downlink timeslot;
a message generating module, configured to generate a hybrid automatic repeat request HARQ acknowledgement/negative acknowledgement ACK/NACK message corresponding to a current downlink timeslot according to a receiving condition of downlink data of the current downlink timeslot;
the detection module is used for monitoring and then sending LBT channel detection in the distributed unlicensed frequency band;
and the sending module is used for obtaining an authorization-free frequency band feedback channel corresponding to the current downlink time slot under the condition that the LBT channel is successfully detected, and sending the HARQ ACK/NACK message corresponding to the current downlink time slot to the base station through the authorization-free frequency band feedback channel corresponding to the current downlink time slot.
13. A terminal, comprising:
a processor; and
a memory coupled to the processor for storing instructions that, when executed by the processor, cause the processor to perform the hybrid automatic repeat request feedback method of any of claims 1-11.
14. A non-transitory computer readable storage medium having stored thereon a computer program, wherein the program when executed by a processor implements the steps of the method of any one of claims 1-11.
15. A hybrid automatic repeat request feedback system, comprising: the terminal of claim 12 or 13; and
and the base station is used for receiving the HARQ ACK/NACK message which is sent by the terminal and corresponds to the current downlink time slot according to the downlink data which is sent to the terminal at the current downlink time slot.
16. The feedback system of claim 15,
and the base station is also used for selecting the nearest downlink time slot to retransmit the downlink data under the condition that the received HARQ ACK/NACK message is a NACK message.
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