HARQ Buffer Release in Broadcast Downlink Scheduling
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Solution Overview
Problem
MBMS and MBS scenarios lack support for HARQ feedback, leading to uncertainty in data reception status and inadequate data transmission reliability, as the transmit device cannot determine if retransmissions are necessary.
Innovation Solution
Implementing a communication method that includes clearing or releasing HARQ buffers and processes based on specific conditions, such as new data identification or stop indications, to optimize HARQ resource allocation and improve data transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ feedback is introduced into broadcast/groupcast, then data transmission reliability is improved, but device complexity and resource management difficulty increase
Solution Approach 1:
The patent segments HARQ processes into multiple independent parallel processes, each handling specific data transmissions. This allows the system to manage HARQ feedback for different data streams simultaneously without overwhelming complexity, as each process operates independently with its own buffer and state tracking.
Solution Approach 2:
The patent implements dynamic HARQ buffer clearing and release mechanisms based on real-time transmission status. When transmission stops or new data arrives, the system dynamically adjusts which buffers to clear and which processes to release, optimizing resource utilization while maintaining manageable complexity through condition-based automation.
2Productivity
If HARQ buffers are not cleared timely, then data processing continuity is maintained, but available HARQ processes for new data are reduced
Solution Approach 1:
The patent performs preliminary buffer clearing actions based on predicted transmission status changes. When the system detects that transmission will stop or new data is incoming, it proactively clears relevant HARQ buffers before the actual data processing needs to change, ensuring smooth transitions and maximizing available processes for new data without disrupting ongoing processing.
Solution Approach 2:
The patent maintains continuous useful action by ensuring that HARQ processes are continuously reused for new data transmissions. Through timely buffer clearing and process release, the system keeps HARQ resources in a ready state for continuous data processing, preventing idle time and maximizing transmission efficiency while maintaining processing continuity.
3Adaptability or versatility
If HARQ processes are released early, then resource utilization is improved, but data processing may be interrupted
Solution Approach 1:
The patent implements feedback mechanisms that monitor transmission status and buffer states in real-time. Based on this feedback, the system intelligently decides when to release HARQ processes and when to keep them active, ensuring that resource release actions are taken only when safe to do so, thus optimizing utilization while maintaining processing stability through data-driven decisions.
Solution Approach 2:
The patent dynamically changes operational parameters of HARQ processes based on transmission conditions. When transmission stops or new data arrives, the system changes the state of HARQ buffers and processes accordingly - clearing buffers, releasing processes, or transitioning between states - to optimize resource utilization while maintaining stability through controlled, condition-based parameter changes.
Data Source
AI summary
A communication method includes determining, by a terminal device, that a second new data indicator (NDI) is toggled in response to a first condition being met. The second NDI is associated with a second resource. The method also includes receiving, by the terminal device, a second data. The second data is transmitted on the second resource. The second resource is associated with a second hybrid automatic repeat request (HARQ) process identifier (ID). The first condition includes the second resource is scheduled by using downlink control information (DCI) or physical downlink control channel (PDCCH) scrambled by a radio network temporary identifier (RNTI), among one or more other suitable conditions.