Multicast HARQ Process Segmentation in Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in performing wireless signal transmission and reception procedures, particularly in managing hybrid automatic repeat request (HARQ) processes and resource allocation for downlink multicast services across multiple users.
Innovation Solution
A method and apparatus for efficiently receiving and transmitting wireless signals by using multicast configuration information, including a group-radio network temporary identifier (G-RNTI) and an indicator for enabling HARQ, to decode and acknowledge multicast transport blocks (TBs) through specific downlink and uplink frequency resources, optimizing resource usage and HARQ processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ process is enabled for downlink multicast service, then transmission reliability is improved, but device complexity and resource management difficulty increase
Solution Approach 1:
The patent segments the multicast service configuration by introducing service-specific indicators (SSBRI, SSBRI-2, SSBRI-3) for different HARQ processes. Each HARQ process is independently configured and managed, allowing the system to enable HARQ reliability for specific services while keeping other services simpler, thus resolving the contradiction between reliability and complexity.
Solution Approach 2:
The patent implements dynamic HARQ process management where the network can flexibly enable or disable HARQ for different multicast services based on requirements. The configuration allows dynamic switching between HARQ-enabled and HARQ-disabled modes for different service IDs, optimizing the balance between reliability and complexity in real-time.
2Adaptability or versatility
If multiple HARQ processes are configured for different services, then service differentiation and reliability are improved, but resource allocation complexity increases
Solution Approach 1:
The patent divides multicast services into separate HARQ process groups, each identified by unique indicators (SSBRI, SSBRI-2, SSBRI-3). This segmentation allows independent resource allocation and management for each service, improving adaptability while managing complexity through modular configuration rather than monolithic resource management.
Solution Approach 2:
Different HARQ processes are configured with different parameters and resources according to specific service requirements. Each service ID can have its own HARQ process configuration, allowing local optimization of resource allocation for each service while maintaining overall system manageability through service-specific rather than system-wide complexity.
3Reliability
If HARQ-ACK reporting is enabled via PUCCH, then transmission reliability is improved, but uplink resource usage and interference increase
Solution Approach 1:
The patent segments HARQ-ACK reporting resources by associating different PUCCH resources with different service IDs and HARQ processes. This allows efficient utilization of uplink resources through targeted reporting only when necessary, reducing overall uplink resource consumption while maintaining reliability for services that require it.
Solution Approach 2:
The system enables HARQ-ACK reporting selectively rather than universally. The network can choose to enable HARQ-ACK reporting only for specific services or conditions, avoiding unnecessary uplink resource usage while maintaining reliability where needed. This partial application of HARQ-ACK reporting optimizes the balance between reliability and resource consumption.
Data Source
AI summary
A terminal according to one embodiment of the present invention may: receive multicast configuration information including an indicator indicating whether G-RNTI and HARQ processes related to at least one downlink multicast service are activated; receive DCI in which CRC is scrambled with a G-RNTI on a specific downlink frequency resource; perform decoding of a multicast TB carried by a PDSCH on the basis of the DCI; and transmit and receive information on the decoding result of the multicast TB through a PUCCH resource indicated by the DCI on a specific uplink frequency resource, on the basis of the indicator included in the multicast configuration information indicating activation of the HARQ process.