PDSCH Scheduling and HARQ-ACK Separation for 5G Broadcast Efficiency
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing and optimizing the transmission of unicast and multicast/broadcast physical downlink shared channels (PDSCH) in high-frequency bands, particularly in 5G and beyond systems, to meet the increasing demand for wireless data communication services and support enhanced services like augmented reality (AR), virtual reality (VR), and mixed reality (MR).
Innovation Solution
The method involves configuring terminals and base stations to manage unicast and multicast/broadcast PDSCHs through dynamic scheduling and semi-persistent scheduling, utilizing HARQ processes, HARQ-ACK codebooks, and radio network temporary identifiers (RNTIs) to optimize the reception and transmission of downlink data, including generating separate HARQ-ACK codebooks for multicast and unicast channels, and handling semi-persistent scheduling configurations based on RNTI types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate HARQ-ACK codebooks are generated for multicast and unicast channels, then the reliability of data transmission is improved, but the device complexity increases
Solution Approach 1:
The patent segments the HARQ-ACK codebook into separate codebooks for unicast PDSCH and multicast/broadcast PDSCH. The terminal device generates a first HARQ-ACK codebook for unicast channels and a second HARQ-ACK codebook for multicast/broadcast channels independently, allowing separate management and transmission of acknowledgment information for different channel types, thereby improving reliability while maintaining manageable complexity through structured organization.
Solution Approach 2:
The patent introduces a new dimension by transmitting HARQ-ACK information through two different uplink channels: PUCCH for unicast HARQ-ACK and PUSCH for multicast/broadcast HARQ-ACK. This dimensional separation in transmission paths allows independent optimization of each channel's reliability characteristics without interfering with the other, resolving the contradiction between reliability improvement and system complexity.
2Productivity
If dynamic scheduling and semi-persistent scheduling are used for PDSCH, then the productivity of data transmission is improved, but the device complexity increases
Solution Approach 1:
The patent implements dynamic scheduling for PDSCH where the terminal receives downlink assignments with flexible timing indications (K0, K1, K2 values) that can be adjusted based on traffic conditions. The HARQ-ACK timing is dynamically determined through DCI signaling, allowing the system to adapt transmission schedules to varying service requirements, thereby improving productivity while the terminal manages complexity through standardized processing of dynamic grants.
Solution Approach 2:
The patent employs semi-persistent scheduling (SPS) for PDSCH where resources are pre-configured through RRC signaling before actual data transmission. The terminal receives SPS configuration parameters in advance, and subsequent transmissions occur on pre-allocated resources without requiring new grants, reducing scheduling overhead and improving productivity for periodic traffic patterns while simplifying real-time scheduling management.
3Adaptability or versatility
If multiple RNTI types are used for different PDSCH types, then the adaptability of the communication system is improved, but the difficulty of detecting and measuring increases
Solution Approach 1:
The patent assigns different RNTI types to different service scenarios: C-RNTI for unicast services, G-RNTI for multicast services, and GC-RNTI for grant-free uplink services. Each RNTI type is specifically optimized for its intended service type, allowing the terminal to efficiently identify and process downlink assignments based on the RNTI value in the DCI, thereby improving adaptability while maintaining simple detection through RNTI-specific processing rules.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. An apparatus and a method performed by the same in a wireless communication system are disclosed. The method includes: receiving configuration information from a base station; and receiving a downlink signal from the base station based on the configuration information, the downlink signal including downlink data. The downlink data includes a unicast physical downlink shared channel (PDSCH) and/or a multicast/broadcast PDSCH, the unicast PDSCH includes a dynamically scheduled unicast PDSCH and/or a unicast semi-persistent scheduling (SPS) PDSCH, and the multicast/broadcast PDSCH includes a dynamically scheduled multicast/broadcast PDSCH and/or a multicast/broadcast SPS PDSCH. The present disclosure improves the efficiency of uplink or downlink transmission.