MBS HARQ Process Mapping to Prevent Multicast Reception Collisions
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Solution Overview
Problem
In 5G NR systems, the limited number of HARQ processes can lead to collisions and data loss when transmitting multiple multicast broadcast services, as newly transmitted data can cover previously stored old data, rendering reception failures and unachievable data transmission.
Innovation Solution
A communication method that avoids HARQ process collisions by configuring dedicated corresponding relations between HARQ process numbers and MBS identities, allowing some MBSs to be received without HARQ processes, or using the same HARQ process for multiple MBSs, and implementing specific processing behaviors to reduce data loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ processes are used for receiving multiple multicast broadcast services, then data transmission reliability is improved, but HARQ process collisions occur when the number of services exceeds the limited number of HARQ processes
Solution Approach 1:
The patent segments the reception of multicast broadcast services into two distinct modes: HARQ-based reception for reliable data transmission and non-HARQ reception for services that do not require retransmission. This segmentation allows the system to handle multiple MBS simultaneously by assigning appropriate reception modes to different services, thereby avoiding HARQ process collisions while maintaining data transmission reliability for critical services.
Solution Approach 2:
The patent introduces dynamic switching between HARQ and non-HARQ reception modes based on service requirements and system conditions. The terminal can dynamically select whether to use HARQ processes for each MBS reception, allowing flexible adaptation when the number of active MBS exceeds the available HARQ process count, thus resolving the contradiction between reliability and adaptability.
2Productivity
If the same HARQ process is reused for multiple MBS, then HARQ process availability is improved, but data loss occurs when newly transmitted data covers previously stored old data
Solution Approach 1:
The patent segments MBS reception into HARQ-based and non-HARQ-based modes, allowing services that are less sensitive to data loss to use HARQ process reuse while critical services maintain dedicated HARQ processes. This segmentation enables higher overall HARQ process availability while minimizing data loss for important services.
Solution Approach 2:
The patent changes the operational parameters of HARQ processes by introducing non-HARQ reception as an alternative mode. When HARQ process reuse is detected to cause data loss, the system changes the reception parameter from HARQ-based to non-HARQ-based, thereby maintaining productivity while preventing data loss through parameter adjustment.
3Measurement precision
If HARQ feedback is transmitted for MBS reception, then data transmission accuracy is improved, but uplink control signaling overhead increases
Solution Approach 1:
The patent segments MBS reception into HARQ-based mode (with feedback for high accuracy requirements) and non-HARQ-based mode (without feedback for lower overhead). This segmentation allows the system to achieve high data transmission accuracy for critical services while reducing overall uplink control signaling overhead by using non-HARQ mode for less critical services.
Solution Approach 2:
The patent changes the feedback parameter dynamically based on service requirements. For services where high accuracy is critical, HARQ feedback is enabled; for services where overhead reduction is more important, non-HARQ reception is used. This parameter change approach balances data transmission accuracy with signaling overhead reduction.
Data Source
AI summary
A communication method, including: determining first information, the first information being used for indicating a hybrid automatic repeat request process used for receiving a multicast broadcast service or being used for indicating that a hybrid automatic repeat request process is not used for receiving the multicast broadcast service; and, on the basis of the first information, receiving the multicast broadcast service.