HARQ Process Allocation for Unicast and Multicast Transmission
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Solution Overview
Problem
Current HARQ technologies are not applicable to multicast transmission, necessitating a redesign to ensure reliability in both unicast and multicast scenarios, as existing HARQ mechanisms are specific to unicast and do not support multicast services.
Innovation Solution
A HARQ mechanism is designed to differentiate between unicast and multicast transmission modes using C-RNTI and G-RNTI scrambling, allowing for the allocation of transport blocks to appropriate HARQ processes based on transmission indication information, ensuring compatibility across different transmission modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing HARQ technology is applied to multicast transmission, then unicast transmission reliability is maintained, but multicast transmission reliability cannot be ensured due to incompatibility
Solution Approach 1:
The patent segments the HARQ process identification by introducing a transmission mode indication field that divides the HARQ process into unicast-specific processes and multicast-specific processes. This segmentation allows the system to maintain separate HARQ mechanisms for unicast and multicast transmissions, ensuring that each transmission mode receives appropriate reliability handling without interference from the other mode's HARQ processes.
Solution Approach 2:
The patent creates a universal HARQ mechanism that can handle both unicast and multicast transmissions by incorporating a transmission mode indication field into the HARQ process identification. This field enables a single HARQ framework to universally support multiple transmission modes (unicast and multicast) while maintaining mode-specific reliability characteristics through separate process identification.
2Reliability
If a dedicated HARQ mechanism is redesigned for multicast transmission, then multicast reliability is improved, but system complexity increases
Solution Approach 1:
The patent merges the unicast and multicast HARQ mechanisms into a unified framework by introducing a transmission mode indication field that works within the existing HARQ process identification structure. Instead of creating entirely separate HARQ systems, the patent combines both modes under one HARQ mechanism, using the indication field to route unicast and multicast transmissions to their respective dedicated processes while maintaining overall system simplicity.
3Adaptability or versatility
If transmission mode indication information is added to scheduling information, then HARQ process differentiation is enabled, but information overhead increases
Solution Approach 1:
The patent applies local quality by adding the transmission mode indication field specifically to the scheduling information that accompanies transport blocks, rather than modifying the entire HARQ framework or adding overhead throughout the system. This localized addition of indication information only where needed (in the scheduling information for transport blocks) enables mode differentiation with minimal impact on overall system overhead.
Data Source
AI summary
This application provides a data transmission method and an apparatus, and relates to the field of communication technologies. A proper HARQ mechanism is designed to ensure a normal HARQ in unicast transmission or multicast transmission. The data transmission method includes: receiving scheduling information from a first communication apparatus; determining transmission indication information based on the scheduling information; receiving, based on the scheduling information, a first transport block from the first communication apparatus, and determining first hybrid automatic repeat request HARQ information of the first transport block; and determining a first HARQ process based on the first HARQ information and the transmission indication information, and allocating the first transport block to the first HARQ process.