HARQ Feedback for Point-to-Multipoint Transmission in NR
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Solution Overview
Problem
In the New Radio (NR) system, there is no feedback mechanism for multicast or broadcast services, leading to service data loss without remedy.
Innovation Solution
A method for information feedback is introduced, where a terminal receives preset information including point-to-multipoint (PTM) transmission information from a network device and feeds back hybrid automatic repeat request (HARQ) response information, including HARQ response information of the PTM transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If no feedback mechanism is implemented for multicast or broadcast services, then the system complexity is reduced, but service data reliability deteriorates due to undetected data loss
Solution Approach 1:
The patent implements a feedback mechanism where user equipment sends HARQ-ACK information to the network device for PTM transmission. The terminal determines HARQ-ACK based on whether PTM data is correctly received and feeds back this information through uplink control channels, enabling the network to detect data loss and perform retransmissions, thus resolving the contradiction between maintaining simple system architecture and ensuring reliable data transmission.
2Reliability
If HARQ feedback mechanism is introduced for PTM transmission, then service data reliability is improved through retransmission capability, but system complexity increases due to additional feedback procedures
Solution Approach 1:
The patent reuses existing uplink control resources (PUCCH and PUSCH channels) for HARQ-ACK feedback of PTM transmission, rather than creating dedicated feedback channels. This allows the system to implement reliable HARQ feedback while leveraging already-deployed communication infrastructure, thereby improving reliability without proportionally increasing system complexity.
3Reliability
If HARQ response information is fed back for PTM transmission, then data loss remediation is enabled, but uplink resource requirements increase
Solution Approach 1:
The patent combines HARQ-ACK feedback for PTM transmission with existing uplink control information transmission. The terminal multiplexes PTM HARQ-ACK with other uplink control signals using the same PUCCH or PUSCH resources, thereby enabling data loss remediation through feedback while sharing uplink resource usage with other control functions and avoiding dedicated resource allocation.
Data Source
AI summary
A method for information feedback and related devices are provided. The method includes the following. A terminal receives preset information from a network device, where the preset information at least includes point-to-multipoint (PTM) transmission information. The terminal feeds back HARQ response information of the preset information to the network device, where the HARQ response information includes HARQ response information of the PTM transmission information.