CN114710244A

CN114710244A - Method, electronic device and storage medium for HARQ (hybrid automatic repeat request) feedback of NR (non-reciprocal) cell

Info

Publication number: CN114710244A
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: 2022-07-05
Anticipated expiration: 2042-03-14
Also published as: CN114710244B

Abstract

The invention discloses a method for HARQ feedback of an NR 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 more than 2bits needs to be transmitted, a base station appoints a format3PUCCH resource in an allocated PUCCH resource set 2# to transmit the ACK/NACK feedback data of more than 2bits for the user terminal; if the format3PUCCH resources in the PUCCH resource set 2# are all occupied, for other user terminals which are allocated but can not specify the format3PUCCH resources in the PUCCH resource set 2# and need to transmit ACK/NACK feedback data of >2bits, the base station carries out uplink scheduling authorization on the user terminals, so that the user terminals initiate PUSCH transmission without UL-SCH on the time slot originally transmitting the ACK/NACK feedback data of >2bits and transmit the 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 influenced because the PUCCH resources cannot be scheduled after conflict.

Description

Method, electronic device and storage medium for HARQ (hybrid automatic repeat request) feedback of NR (non-reciprocal) cell

Technical Field

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

Background

Currently, there are two ways for UCI (Uplink Control Information) feedback, one is feedback through a configured PUCCH (Physical Uplink Control Channel), and the other is feedback through a PUSCH (Physical Uplink shared Channel) when a timeslot fed back by UCI is transmitted simultaneously with a PUSCH (Physical Uplink shared Channel);

the UCI includes three major parts of ACK/NACK/SR/CSI Report, and SR (Schedule Request) and CSI (Channel State Information) reporting can be configured as periodic reporting, ACK (Acknowledgement)/NACK (Negative Acknowledgement) feedback of 2bits can be fed back by PUCCH format0/1, and format1 of one PRB (Physical resource block) can have up to 84 available code channels without frequency hopping. In an NR system, especially a TDD (Time Division duplex) system, ACK/NACK feedback of downlink scheduling of multiple timeslots of a single user may be accumulated on a specific uplink timeslot (Slot) for transmission, 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 centralized manner on Slot18, and when downlink scheduling is a single codeword each Time, ACK/NACK information of 8 bits needs to be fed back on Slot 18.

TABLE 1

When the ACK/NACK bits is >2, the PUCCH format2/3/4 format needs to be configured for transmission. However, the current protocol provides that each UE can only configure 4 PUCCH resource sets (resource set numbers 1#, 2#, 3#, 4#), except that the first PUCCH resource set (used for transmitting UCI information of 2 bits) can configure 32 PUCCH resources, each of the other three PUCCH resource sets can only configure 8 PUCCH resources (format 2/3/4 may be adopted, the format3 is adopted in the present invention), 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 load bits, it can only select resource set 2#, and the base station designates the terminal to use one of 8 PUCCH resources of resource set 2 #.

When the number of users is large and the specification of the number of downlink scheduling users per time slot is high, the ACK/NACK feedback of a plurality of users can be transmitted on the same uplink time slot in a centralized manner, and the difficulty of PUCCH resource allocation can be greatly increased. Table 2 shows an example of the per-timeslot downlink scheduling specification of 4 and the polling scheduling:

TABLE 2

And polling scheduling, wherein the scheduled users in each time slot share the bandwidth resources, a 1/2/3/4# terminal is scheduled in the first time slot (slot5), and a 5/6/7/8# terminal is scheduled in the second time slot (slot 6). Then a maximum of 10 UEs (User Equipment) will transmit ACK/NACK of >2bits in the same uplink timeslot. When the specification of the number of downlink scheduling users per time slot is further improved, the maximum number of users transmitting ACK/NACK with the length of 2bits on the same uplink time slot is also improved. As shown in table 3 (Nptti represents the number of downlink scheduled users per time slot, and TTInum represents the number of downlink time slots before ACK/NACK is fed back in uplink): in table 3, Nptti ═ 4, TTInum ═ 8, and FT3harq max ═ 10 are the results of the polling scheduling shown in table 2.

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 that the number of active users is 400, of which 10 require feedback >2bits ACK/NACK, the possible combinations are 400! And (10 | (400-10) |) 2.57981E +19, it is impossible to configure each UE with completely separate PUCCH resources. And the collision inevitably occurs when the PUCCH resources configured with the same configuration are the same, and after the collision, one of the terminals cannot perform downlink scheduling, which affects the downlink throughput rate of the cell.

For the above problems, the current solution:

estimating the possibility that users are simultaneously scheduled in a downlink mode, dividing the UEs which are possibly simultaneously scheduled in the downlink mode into different groups, and dynamically reconfiguring different PUCCH resources 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 and influence throughput performance, and the allocated PUCCH resources can divide uplink frequency bands into fragmentary uplink frequency bands and influence single-user uplink throughput peak values.

Disclosure of Invention

The invention provides a method, electronic equipment and a storage medium for NR cell HARQ feedback, which are used for solving the problem that downlink scheduling is limited due to PUCCH resource allocation conflict.

In order to solve the above problems, the technical solution adopted by the present invention is as follows:

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

if the format3PUCCH resource in the PUCCH resource set 2# is used in the same uplink slot, for other user terminals that are allocated but cannot specify the format3PUCCH resource in the PUCCH resource set 2# and need to transmit ACK/NACK feedback data of >2bits, the base station performs uplink scheduling authorization on the user terminals, so that the user terminals initiate PUSCH transmission without UL-sch (uplink Shared channel) on the uplink slot that originally transmits ACK/NACK feedback data of >2bits, and transmit ACK/NACK feedback data of >2bits to the base station.

The technical effect of the technical scheme is as follows: on one hand, complexity of PUCCH resource set 2# allocation and designation is reduced, and the problem that downlink scheduling cannot be performed after PUCCH resource conflict so that the performance of single-user or cell downlink throughput is affected is solved; on the other hand, the PRB resource consumption of the PUCCH 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 PUCCH resource set 2# has 8 format3PUCCH resources in common.

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 PUCCH resource consumption is reduced, more PRB resources are used for uplink scheduling, and the uplink throughput rate of a single user or the cell is improved.

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

The technical effect of the technical scheme is as follows: the minimum PRB number of the PUCCH of the Format3 is 1, the requirement of feeding back ACK/NACK information of >2bits is met, the consumption of PUCCH resources 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 that are executable 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 having stored thereon computer-executable instructions for performing the method of the first aspect.

In order to make the aforementioned objects, features and advantages of the present invention 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 needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is an exemplary diagram of 8:2 ratio single-user downlink scheduling and ACK/NACK feedback timing in an embodiment;

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

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

fig. 4 is a schematic flowchart of allocating format3PUCCH resources in the embodiment;

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

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of 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 present invention, 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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the TDD system, ACK/NACK feedback data of downlink scheduling of a user terminal is accumulated to the same uplink slot, thereby causing ACK/NACK feedback data of >2bits to be transmitted, and for this situation, an example description of the NR cell HARQ feedback method of the present invention is performed below.

Example 1

As shown in fig. 1, 2 and 3, when there is also a format3PUCCH resource in the unallocated PUCCH resource set 2#, the base station allocates a format3PUCCH resource in the PUCCH resource set 2# for the user terminal to transmit ACK/NACK feedback data of >2 bits.

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

As shown in fig. 5, when a user terminal is scheduled at time 8 as shown in fig. 1, or scheduled at

times

5 and 8 as shown in fig. 2, or scheduled at

times

4 and 7 as shown in fig. 3, if corresponding uplink slot18 (shown in fig. 1), slots 9 and 14 (shown in fig. 2), and slot8 and 14 (shown in fig. 3) PUCCH resource set 2# do not have format3PUCCH resources available, uplink scheduling is triggered for the user terminal. That is, the base station performs uplink scheduling authorization on the user terminal, so that the user terminal initiates PUSCH transmission without UL-SCH on an uplink time slot originally transmitting ACK/NACK feedback data of >2bits, and transmits the ACK/NACK feedback data of >2bits to the base station.

Example 2

When the bandwidth is large, more PUCCH resources can be configured. For example, format3PUCCH resources of 16 PRBs under 100M bandwidth only occupy 5.9% of the full bandwidth 16/273.

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 sequentially allocated as a group of PUCCH resource sets 2# in the user terminal access order.

For example, when N is 2, format3PUCCH resources of 16 PRBs are divided into two groups, i.e., 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 first group is allocated when the terminals accessed later, and the second group is allocated after the multiples of 8 are reached.

As shown in fig. 5, when a terminal is scheduled at time 8 as shown in fig. 1, or scheduled at

time

5 and 8 as shown in fig. 2, or scheduled at

time

4 and 7 as shown in fig. 3, if a corresponding uplink slot18 (shown in fig. 1), slots 9 and 14 (shown in fig. 2), and slots 8 and 14 (shown in fig. 3) have no format3PUCCH resource to be specified, uplink scheduling is triggered for the user terminal. That is, the base station performs uplink scheduling authorization on the user terminal, so that the user terminal initiates PUSCH transmission without UL-SCH on a slot which originally transmits ACK/NACK feedback data of >2bits, and transmits the ACK/NACK feedback data of >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 achieves a certain technical effect.

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

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

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

a memory to store instructions;

a processor for reading the instructions in the memory, performing the following processes: if the physical uplink control channel PUCCH bearing the ACK/NACK and the physical uplink shared channel PUSCH have time overlap, the ACK/NACK information originally transmitted on the PUCCH 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 the PUSCH satisfy a time condition for transferring ACK/NACK carried on the PUCCH to PUSCH for transmission.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement 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 NR cell HARQ feedback, for a certain user terminal, if ACK/NACK feedback data of >2bits needs to be transmitted, a base station assigns a format3PUCCH resource in an allocated PUCCH resource set 2# to the user terminal to transmit the ACK/NACK feedback data of >2bits,

if the format3PUCCH resources in the PUCCH resource set 2# are used in the same uplink time slot, for other user terminals which are allocated but can not 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 authorization on the user terminals, so that the user terminals initiate PUSCH transmission without UL-SCH on the uplink time slot originally transmitting the ACK/NACK feedback data of >2bits and transmit the ACK/NACK feedback data of >2bits to the base station.

2. The method for NR cell HARQ feedback according to claim 1, wherein there are 8 format3PUCCH resources in the PUCCH resource set 2 #.

3. The method for NR cell HARQ feedback according to claim 1 or 2, wherein 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 for execution by the processor to cause the processor to carry out the method of any one of claims 1 to 3 when executing the instructions.

5. Computer-readable storage medium, characterized in that it stores computer-executable instructions for performing the method according to any one of claims 1 to 3.