DCI PUCCH Resource Indication for Multicast HARQ Feedback
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Solution Overview
Problem
In LTE and NR networks, the current multicast/broadcast technologies face challenges in efficiently managing PUCCH feedback resources, leading to increased resource costs and conflicts due to the inability to accurately distinguish and manage HARQ feedback from multiple terminals.
Innovation Solution
A method is introduced where Downlink Control Information (DCI) is used to indicate PUCCH resources for multiple terminals, with the CRC scrambled by a common RNTI, and includes multiple PUCCH resource indicators and transmission power control commands, allowing terminals to determine their specific resources through high-level signaling, reducing the need for orthogonal resource sets and avoiding resource conflicts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple terminals use the same PUCCH resource for HARQ feedback in multicast/broadcast services, then resource utilization is improved, but the network side cannot distinguish feedback from different terminals
Solution Approach 1:
The PUCCH resource indicator field in DCI is segmented into multiple sub-fields, where each sub-field corresponds to a specific terminal. This allows the network to indicate different PUCCH resources for different terminals within the same multicast group, enabling both resource sharing and feedback source identification.
Solution Approach 2:
Different portions of the PUCCH resource indicator field are allocated to different terminals based on their specific needs and positions in the terminal list. Each terminal has a designated local segment of the field that determines its specific PUCCH resource, allowing differentiated resource allocation while maintaining overall resource efficiency.
2Loss of information
If orthogonal PUCCH resource sets are configured for each terminal, then feedback distinction is improved, but network resource cost increases linearly with terminal count
Solution Approach 1:
Multiple terminal-specific PUCCH resource indicators are merged into a single DCI message. The DCI contains a PUCCH resource indicator field that is divided into sub-fields, each indicating a PUCCH resource for a different terminal. This combining approach allows the network to manage multiple terminals' feedback resources efficiently without requiring separate DCI messages or extensive orthogonal resource sets.
Solution Approach 2:
The PUCCH resource indicator field in DCI serves multiple functions simultaneously: it indicates PUCCH resources for multiple different terminals, supports both unicast and multicast services, and enables the network to distinguish feedback sources without requiring separate configuration mechanisms for each terminal.
3Adaptability or versatility
If PUCCH resources are indicated through three-bit indexing in PDCCH, then resource flexibility is improved, but resource conflicts occur when multiple terminals use the same indication
Solution Approach 1:
The PUCCH resource indication is extended from a single three-bit index to a multi-dimensional structure where the same three-bit field is interpreted differently for different terminals. Each terminal has a specific position or offset in the terminal list that determines how it interprets the indicated resource, effectively adding a terminal-specific dimension to the resource indication without increasing the basic field size.
Data Source
AI summary
Provided in the present disclosure are a resource indication method, a resource determination method, an apparatus, a network side device, and a terminal. The method comprises: sending downlink control information (DCI), wherein the DCI is used for O indicating a PUCCH resource of HARQ-ACK information of at least two terminals.