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Hybrid retransmission feedback method, network side equipment and terminal

A network-side device, hybrid retransmission technology, applied in transmission systems, digital transmission systems, and error prevention, etc., can solve problems such as ineffective coding bits, reducing transmission rates, and polluting cache space data.

Active Publication Date: 2021-11-19
CHINA MOBILE COMM LTD RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, on the one hand, this multiplexing method will cause downlink transmission errors of eMBB terminals and reduce the transmission rate.
On the other hand, because the eMBB terminal cannot know whether its own resources are occupied, and what is transmitted on the occupied resources is not valid coded bits, after performing soft combining (soft combining), it will pollute the existing data in the buffer space (softbuffer). data

Method used

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  • Hybrid retransmission feedback method, network side equipment and terminal
  • Hybrid retransmission feedback method, network side equipment and terminal
  • Hybrid retransmission feedback method, network side equipment and terminal

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0089] After the downlink transmission of the eMBB terminal in a certain TTI is occupied by the URLLC service, the base station schedules the downlink transmission before the corresponding ACK / NACK feedback timing (indicated by DCI#1), and retransmits the data of the occupied resource part. The DCIs (DCI#1 and DCI#2) indicating two downlink transmissions have the same HARQ process (HARQ process number), RV version and NDI field.

[0090] The eMBB terminal receives a DCI#2 with the same HARQ process, RV version and NDI domain before the ACK / NACK feedback timing indicated by DCI#1, and considers that the downlink transmission resources scheduled by DCI#1 are occupied.

[0091] The eMBB terminal clears the data of the occupied resource part, and uses the retransmitted data to perform soft combining.

[0092] The base station updates the ACK / NACK feedback timing through DCI#2, and the eMBB terminal feeds back the ACK / NACK according to the updated timing relationship.

[0093] The...

specific Embodiment 2

[0097] like image 3 As shown, the base station schedules downlink transmission of the terminal through DCI#1 in TTI#1, and resource occupation occurs in the downlink transmission. The ACK / NACK feedback timing indicated by DCI#1 is TTI#5.

[0098] The base station schedules a downlink transmission through DCI#2 at TTI#2, and DCI#2 and DCI#1 have the same HARQ process, RV version, and NDI domain. The ACK / NACK feedback timing indicated by DCI#2 is TTI#7.

[0099] The base station detects whether there is an ACK / NACK of the terminal at both TTI#5 and TTI#7. If it is not detected on TTI#5 and detected on TTI#7, it is known that the terminal does not miss DCI#2.

[0100] The base station continues the HARQ retransmission process according to the feedback result on TTI#7.

specific Embodiment 3

[0102] like Figure 4 As shown, the base station schedules downlink transmission of a certain terminal through DCI#1 in TTI#1, and resource occupation occurs in the downlink transmission. The ACK / NACK feedback timing indicated by DCI#1 is TTI#5.

[0103] The base station schedules a downlink transmission through DCI#2 at TTI#2, and DCI#2 and DCI#1 have the same HARQ process, RV version, and NDI domain. The ACK / NACK feedback timing indicated by DCI#2 is TTI#7.

[0104] The base station detects whether there is an ACK / NACK of the terminal at both TTI#5 and TTI#7. If detected at TTI#5, it is known that the terminal missed DCI#2.

[0105] The base station schedules downlink transmission through DCI#3 on TTI#9, DCI#3 and DCI#2 have the same HARQ process, and the NDI field flip indicates a new TB transmission.

[0106] The eMBB terminal receives DCI#3 and finds that the NDI field is reversed, and then clears the buffer space of the same HARQ process.

[0107] The embodiment of ...

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Abstract

The invention provides a mixed retransmission feedback method, network side equipment and terminal, and belongs to the field of wireless technology. The hybrid retransmission feedback method includes: the network side device schedules the downlink transmission of the first service of the terminal through the first downlink control information in the first TTI, and the first downlink control information indicates that there is an ACK / NACK feedback timing; After the downlink transmission of the terminal in the first TTI is occupied by the second service, before the ACK / NACK feedback timing indicated by the first downlink control information, the network side device schedules the first service of the terminal through the second downlink control information in the second TTI For downlink transmission, retransmit the data of the occupied resource part, the second downlink control information indicates ACK / NACK feedback timing, and the first downlink control information and the second downlink control information have the same first bit. The invention can timely inform the terminal that its transmission resources are occupied.

Description

technical field [0001] The present invention relates to the field of wireless technologies, and in particular, to a hybrid retransmission feedback method, a network side device and a terminal. Background technique [0002] In the LTE (Long Term Evolution, Long Term Evolution) system, after receiving downlink data in the nth subframe, the terminal will send uplink ACK (Acknowledgement, acknowledgement) / NACK (NegativeAcknowledgment, non-acknowledgement) on the n+kth subframe )information. For an FDD (Frequency Division Dual, frequency division duplex) system, the value of k is 4. For a TDD (Time Division Duplexing, time division duplexing) system, the value of k depends on different uplink and downlink subframe configurations, which can be obtained by looking up a table. After receiving the NACK feedback from the terminal, the base station will perform retransmission scheduling and notify the terminal through DCI (Downlink Control Information, downlink control information). ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/16H04L1/18
CPCH04L1/1607H04L1/1812
Inventor 周伟倪吉庆
Owner CHINA MOBILE COMM LTD RES INST