CN114710244B

CN114710244B - Method, electronic equipment and storage medium for HARQ feedback of NR (hybrid automatic repeat request) cell

Info

Publication number: CN114710244B
Application number: CN202210244195.9A
Authority: CN
Inventors: 陈杰鸿
Original assignee: Sichuan Innogence Technology Co Ltd
Current assignee: Sichuan Innogence Technology Co Ltd
Priority date: 2022-03-14
Filing date: 2022-03-14
Publication date: 2023-06-06
Anticipated expiration: 2042-03-14
Also published as: CN114710244A

Abstract

The invention discloses a method for feeding back HARQ (hybrid automatic repeat request) of an NR (radio resource request) cell, which relates to the technical field of 5G wireless resource management and scheduling, and comprises the following steps: for a certain user terminal, if uplink ACK/NACK feedback data of downlink scheduling of >2bits needs to be transmitted, the base station designates a certain format3PUCCH resource in an allocated PUCCH resource set 2# for the user terminal to transmit the ACK/NACK feedback data of >2 bits; if format3PUCCH resources in PUCCH resource set 2# are occupied, then for other user terminals that have been allocated but cannot specify format3PUCCH resources in PUCCH resource set 2# and need to transmit ACK/NACK feedback data of >2bits, the base station performs uplink scheduling grant on the user terminals, so that the base station initiates PUSCH transmission without UL-SCH on a time slot that originally transmits ACK/NACK feedback data of >2bits, and transmits ACK/NACK feedback data of >2bits to the base station. The invention reduces the complexity of PUCCH resource set 2# allocation and avoids the problem that the downlink throughput performance is affected by incapability of scheduling after PUCCH resource conflict.

Description

Method, electronic equipment and storage medium for HARQ feedback of NR (hybrid automatic repeat request) cell

Technical Field

The invention relates to a fifth generation mobile communication (NR) PUCCH resource allocation and UCI on PUSCH channel transmission technology, belonging to the technical field of 5G wireless resource management and scheduling, in particular to a method, electronic equipment and storage medium for HARQ feedback of an NR cell.

Background

There are two modes of current UCI (Uplink Control Information ) feedback, one is feedback through configured PUCCH (Physical Uplink Control Channel ), and the other is feedback through PUSCH channel when the slots of UCI feedback are simultaneously transmitted with PUSCH (Physical uplink shared channel );

UCI includes three major parts of ACK/NACK/SR/CSI Report, whereas SR (Schedule Request) and CSI (Channel State Information ) reporting may be configured as periodic reporting, ACK (Acknowledgement)/NACK (Negative ACKnowledgment, negative Acknowledgement) feedback of < 2bits may be fed back by PUCCH format0/1, and format1 of one PRB (Physical resource block ) may have up to 84 channels without frequency hopping. In an NR system, especially a TDD (Time Division Duplexing, time division duplex) system, ACK/NACK feedback of downlink scheduling of multiple timeslots of a single user may be accumulated and transmitted on a specific uplink timeslot (Slot), that is, there is a possibility of ACK/NACK feedback of >2bits, as shown in table 1, ACK/NACK of downlink scheduling of Slot 5/6/7/10/11/12/13/14 is transmitted in a concentrated manner on Slot18, and when each downlink scheduling is a single codeword, ACK/NACK information of 8 bits needs to be fed back on Slot 18.

TABLE 1

When ACK/NACK bits >2, PUCCH format2/3/4 format needs to be configured for transmission. However, the current protocol specifies that each UE can only configure 4 PUCCH resource sets (resource set numbers 1#,2#,3#, 4#), and each of the other three PUCCH resource sets can only configure 8 PUCCH resources (format 2/3/4 is applicable, format3 format is adopted in the present invention) except that the first PUCCH resource set (UCI information for transmitting < = 2 bits) can be configured with 32 PUCCH resources, and actually, when the UE selects a resource set, it is determined according to the size of UCI information bit that needs to be fed back, that is, when 2< UCI bits < = resource set 2# maximum payload bits, only resource set 2# can be selected for use, and the base station designates one of 8 PUCCH resources of resource set 2# for use by the terminal.

When the number of users is large and the downlink scheduling user number per time slot is high, ACK/NACK feedback of a plurality of users can be concentrated on the same uplink time slot for transmission, and the difficulty of PUCCH resource allocation can be greatly increased. Table 2 is an example of a downlink scheduling specification of 4 per slot and for a poll schedule:

TABLE 2

The users scheduled by the first time slot (slot 5) schedule 1/2/3/4# terminals, and the second time slot (slot 6) schedule 5/6/7/8# terminals. A maximum of 10 UEs (User Equipment) transmit ACK/NACK of >2bits on the same uplink slot. When the specification of the downlink scheduling user number per time slot is further improved, the maximum user number of ACK/NACK which transmits >2bits on the same uplink time slot is also improved. As shown in table 3 (Nptti represents the number of downlink scheduling users per slot, TTInum represents the number of downlink slots before uplink feedback ACK/NACK): nptti=4, ttinum=8, and ft3harq max=10 in table 3 are the results of the polling scheduling shown in table 2.

TABLE 3 Table 3

Nptti	TTInum	FT3HARQmax
			4	8	10
5	8	13
			6	8	16
7	8	18
			8	8	21
9	8	24
			10	8	26
11	8	29
			12	8	32
13	8	34
			14	8	37

Assuming 400 active users, 10 of which require feedback >2bits ACK/NACK, the possible combinations are 400-! It is impossible to configure a completely separate PUCCH resource for each UE,/(10 | (400-10) |) =2.57981e+19. However, the same PUCCH resource configuration inevitably generates a conflict, and one of the terminals cannot perform downlink scheduling after the conflict, which affects the downlink throughput rate of the cell.

For the above problems, the current solution is:

the possibility that the users are simultaneously and downlink scheduled is estimated, the UEs which are possibly simultaneously and downlink scheduled are divided into different groups, different PUCCH resources are dynamically reconfigured in real time through RRC signaling, but the problem of PUCCH resource conflict of different users still cannot be completely avoided, the reconfigured RRC signaling can increase air interface resource consumption to influence throughput performance, and the allocated PUCCH resources can possibly divide an uplink frequency band into a plurality of parts to influence the peak value of the uplink throughput of a single user.

Disclosure of Invention

The invention provides a method, electronic equipment and a storage medium for HARQ feedback of an NR cell, which are used for solving the problem that PUCCH resource allocation conflicts limit downlink scheduling.

In order to solve the problems, the technical scheme adopted by the invention is as follows:

in a first aspect, the present invention provides a method for feedback of HARQ in an NR cell, for a user terminal, if ACK/NACK feedback data of >2bits needs to be transmitted, a base station designates a format3PUCCH resource in an allocated PUCCH resource set 2# for the user terminal to transmit ACK/NACK feedback data of >2bits, which is characterized in that,

if the format3PUCCH resources in PUCCH resource set 2# are all used in the same uplink slot, then for other user terminals that are allocated but cannot specify the format3PUCCH resources in PUCCH resource set 2# and need to transmit ACK/NACK feedback data of >2bits, the base station performs uplink scheduling grant on the user terminal, so that the base station initiates PUSCH transmission without UL-SCH (Uplink Shared Channel) on the uplink slot that originally transmits ACK/NACK feedback data of >2bits, and transmits ACK/NACK feedback data of >2bits to the base station.

The technical effect of the technical scheme is as follows: on one hand, the complexity of PUCCH resource set 2# allocation and assignment is reduced, and the problem that downlink scheduling cannot be performed after PUCCH resource conflict so as to influence the downlink throughput rate performance of a single user or a cell is avoided; on the other hand, PRB resource consumption of the PUCCH channel is reduced, more PRB resources are used for uplink scheduling, and the uplink throughput rate of a single user or a cell is improved.

In a preferred embodiment of the present invention, there are 8 format3PUCCH resources in the PUCCH resource set 2#.

The technical effect of the technical scheme is as follows: all terminals in the whole cell are only configured with the 8 format3PUCCH resources, so that the PUCCH resource consumption is reduced, more PRB resources are used for uplink scheduling, and the uplink throughput rate of a single user or a cell is improved.

In a preferred embodiment of the present invention, the size of each format3PUCCH resource is 1PRB.

The technical effect of the technical scheme is as follows: the minimum PRB number of the PUCCH of Format3 is 1, the requirement of feeding back ACK/NACK information of >2bits is met, the PUCCH resource consumption is reduced, more PRB resources are used for uplink scheduling, and the uplink throughput rate of a single user or a cell is improved.

In a second aspect, the present invention provides an electronic device comprising:

at least one processor, and a memory communicatively coupled to the processor;

wherein the memory stores instructions for execution by the processor to cause the processor to perform the method of the first aspect when executing the instructions.

In a third aspect, the present invention provides a computer-readable storage medium storing computer-executable instructions for performing the method of the first aspect.

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a diagram illustrating an example of 8:2 single user downlink scheduling and ACK/NACK feedback in an embodiment;

FIG. 2 is a diagram illustrating an example of a 4:1 ratio single user downlink scheduling and ACK/NACK feedback timing in an embodiment;

FIG. 3 is a diagram illustrating an exemplary 7:3 ratio single user downlink scheduling and ACK/NACK feedback in an embodiment;

fig. 4 is a schematic flow chart of allocating format3PUCCH resources in an embodiment;

fig. 5 is a schematic diagram of an uplink scheduling procedure for ACK/NACK feedback initiation in an embodiment.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In a TDD system, ACK/NACK feedback data of downlink scheduling of a user terminal is accumulated to the same uplink slot, so that ACK/NACK feedback data of >2bits needs to be transmitted.

Example 1

As shown in fig. 1, 2 and 3, when there is no format3PUCCH resource in PUCCH resource set 2#, the base station allocates format3PUCCH resource in PUCCH resource set 2# to the user terminal to transmit ACK/NACK feedback data of >2 bits.

As shown in fig. 4, when N groups of PUCCH resource sets are allocated, n=1, only one group of PUCCH resource sets 2# are allowed to be allocated, and PUCCH resource sets 2# of all terminals are the same format3PUCCH resources of 8 PRBs.

As shown in fig. 5, when the ue is scheduled 8 times as shown in fig. 1, or scheduled 5 times and 8 times as shown in fig. 2, or scheduled 4 times and 7 times as shown in fig. 3, if corresponding uplink slots 18 (shown in fig. 1), slots 9 and 14 (shown in fig. 2), and PUCCH resource sets 2# of slots 8 and 14 (shown in fig. 3) are not available for format3PUCCH resources, uplink scheduling is triggered once for the ue. Namely, the base station performs uplink scheduling authorization on the user terminal, so that the base station initiates PUSCH transmission without UL-SCH on an uplink time slot which originally transmits ACK/NACK feedback data with the speed of >2bits, and transmits the ACK/NACK feedback data with the speed of >2bits to the base station.

Example 2

In case of larger bandwidth, more PUCCH resources may be configured. For example, format3PUCCH resources of 16 PRBs at 100M bandwidth only occupy 16/273=5.9% of the full bandwidth.

As shown in fig. 4, when N >1, N groups of PUCCH resource sets 2# are allowed to be allocated, and format3PUCCH resources of 8 PRBs are allocated in sequence as a group of PUCCH resource sets 2# according to the user terminal access sequence.

For example, when n=2, format3PUCCH resources of 16 PRBs are divided into two groups, respectively a first group and a second group. The first 8 user terminals are allocated with a first group of format3PUCCH resources by the base station, the 8 user terminals accessed later are allocated with a second group of format3PUCCH resources which are not overlapped with the first group by the base station, and the terminals are accessed later, so that the first group is allocated, and the second group is allocated after the multiple of 8 is reached.

As shown in fig. 5, when the terminal is scheduled 8 times as shown in fig. 1, or scheduled 5 times and 8 times as shown in fig. 2, or scheduled 4 times and 7 times as shown in fig. 3, if the corresponding uplink slots 18 (shown in fig. 1), slots 9 and 14 (shown in fig. 2) are not available for the format3PUCCH resource, the uplink scheduling is triggered once for the user terminal. Namely, the base station performs uplink scheduling authorization on the user terminal, so that the base station initiates PUSCH transmission without UL-SCH on the slot which originally transmits the ACK/NACK feedback data with the bit number of more than 2bits, and transmits the ACK/NACK feedback data with the bit number of more than 2bits to the base station.

In the case described in embodiment 2, compared with embodiment 1, the probability of pucch resource limitation is lower, and the method of the present invention still has a certain technical effect.

Compared with the embodiment 1, more user terminals can utilize PUCCH resources to feed back ACK/NACK, and the PUCCH is a control channel, so that compared with the demodulation capability of a PUSCH data channel, the demodulation capability is stronger under the same signal-to-noise ratio, and the fed back ACK/NACK is more reliable.

Embodiment 2 is a compromise between PUCCH resource occupancy and throughput performance of embodiment 1.

The electronic device for realizing the above embodiment by the user may include:

a memory for storing instructions;

a processor for reading the instructions in the memory, performing the following: if the physical uplink control channel PUCCH carrying the ACK/NACK is overlapped with the physical uplink shared channel PUSCH in time, the ACK/NACK information originally transmitted on the PUCCH channel is transmitted on the PUSCH;

and a transceiver for transceiving data under the control of the processor.

Optionally, the processor is further configured to determine that the PUCCH and PUSCH satisfy a time condition for transferring an ACK/NACK carried on the PUCCH to a transmission on PUSCH.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for HARQ feedback of NR cell, if a user terminal needs to transmit ACK/NACK feedback data of >2bits, a base station designates a format3PUCCH resource in an allocated PUCCH resource set 2# for the user terminal to transmit the ACK/NACK feedback data of >2bits, which is characterized in that,

if the format3PUCCH resources in the PUCCH resource set 2# are all used in the same uplink slot, then for other user terminals that are allocated but cannot specify the format3PUCCH resources in the PUCCH resource set 2# and need to transmit ACK/NACK feedback data of >2bits, the base station performs uplink scheduling grant on the user terminal, so that the base station initiates PUSCH transmission without UL-SCH on the uplink slot that originally transmits ACK/NACK feedback data of >2bits, and transmits ACK/NACK feedback data of >2bits to the base station.

2. The method of NR cell HARQ feedback according to claim 1, characterized in that there are a total of 8 format3PUCCH resources in the PUCCH resource set 2#.

3. The method of NR cell HARQ feedback according to claim 1 or 2, characterized in that the size of each format3PUCCH resource is 1PRB or multiple PRBs.

4. An electronic device, comprising:

at least one processor, and a memory communicatively coupled to the processor;

wherein the memory stores instructions that are executed by the processor to cause the processor to perform the method of any one of claims 1 to 3 when the instructions are executed.

5. A computer readable storage medium storing computer executable instructions for performing the method of any one of claims 1 to 3.