Broadcast Multicast HARQ-ACK Multiplexing on Unicast Uplinks
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Solution Overview
Problem
The existing 5G network struggles with effective HARQ-ACK feedback for broadcast multicast services due to the inability of terminals to efficiently feed back HARQ-ACK information through traditional radio scheduling mechanisms, leading to inefficient resource allocation and poor communication quality.
Innovation Solution
A method and device for multiplexing HARQ-ACK codebooks on uplink resources corresponding to unicast, ensuring that the HARQ-ACK feedback slot and the uplink resource location satisfy a preset window condition, simplifying protocol design and addressing the need for different PUCCH formats in different cell locations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional radio scheduling signaling mechanism is used for HARQ-ACK feedback, then the feedback mechanism is simple, but the terminal cannot effectively feedback HARQ-ACK information for broadcast multicast services
Solution Approach 1:
The patent merges the HARQ-ACK feedback for broadcast multicast services with the unicast uplink resource. The terminal multiplexes the HARQ-ACK codebook for broadcast multicast on the uplink resource allocated for unicast, thereby utilizing existing simple unicast feedback mechanisms to serve dual purposes and avoiding the complexity of designing a separate feedback mechanism for broadcast multicast.
Solution Approach 2:
The uplink resource originally designed for unicast feedback is made universal by enabling it to carry both unicast HARQ-ACK and broadcast multicast HARQ-ACK information. This multi-functional approach allows the same resource to serve multiple purposes, improving feedback effectiveness without proportionally increasing system complexity.
2Reliability
If different PUCCH formats are used for different cell locations, then the feedback can be accurately transmitted, but the protocol design becomes complex
Solution Approach 1:
The patent applies local quality by allowing different PUCCH formats to be used depending on the cell location where the terminal is serving. The terminal determines the appropriate PUCCH format based on the local requirements of the cell, enabling accurate feedback transmission while maintaining protocol simplicity through location-based adaptation rather than universal complexity.
3Reliability
If HARQ-ACK feedback is implemented for broadcast multicast, then communication quality is improved, but resource allocation efficiency decreases
Solution Approach 1:
By merging broadcast multicast HARQ-ACK feedback with unicast uplink resources, the patent avoids allocating separate dedicated resources for broadcast feedback. This consolidation maintains communication quality through effective feedback while improving resource allocation efficiency by utilizing existing unicast resources for dual purposes.
Data Source
AI summary
Disclosed are a hybrid automatic repeat request-acknowledgment (HARQ-ACK) feedback method, a terminal, and a base station. The method includes: transmitting broadcast multicast scheduling signaling to a terminal for indicating the terminal to multiplex, when it is detected that a preset condition is satisfied, a first HARQ-ACK codebook corresponding to the broadcast multicast scheduling signaling on the uplink resource corresponding to unicast, the preset condition being that both a HARQ-ACK feedback slot indicated by the broadcast multicast scheduling signaling and a slot in which the uplink resource is located exist in a preset window; and receiving uplink data transmitted by the terminal through the uplink resource when the preset condition is satisfied, and obtaining a first HARQ-ACK codebook multiplexed on the uplink resource. The protocol design and complexity of HARQ-ACK feedback for broadcast multicast is simplified.