HARQ Process ID Reuse for Semi-Persistent and Dynamic Transmissions
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Solution Overview
Problem
In LTE wireless communication systems, the inefficiency in HARQ process utilization arises from reserving HARQ processes for semi-persistent transmissions, which limits their availability for dynamic transmissions and can lead to resource wastage.
Innovation Solution
A method is introduced to efficiently reuse reserved HARQ process IDs by allowing them to be used for dynamic allocations when the associated data has been successfully transmitted, thereby optimizing resource utilization without compromising persistent transmission integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ processes are reserved for semi-persistent transmissions, then the reliability of semi-persistent transmissions is improved, but the availability of HARQ processes for dynamic transmissions deteriorates
Solution Approach 1:
The patent implements dynamic HARQ process allocation where reserved HARQ processes for semi-persistent transmissions can be dynamically released and reassigned to dynamic transmissions when the semi-persistent transmission is successfully completed. This dynamic mechanism resolves the contradiction by making the HARQ process allocation flexible rather than static, allowing the system to adapt resource allocation based on actual transmission needs.
Solution Approach 2:
The patent enables the recovery and reuse of HARQ processes that were reserved for semi-persistent transmissions after successful completion. When a semi-persistent transmission finishes successfully, its associated HARQ process is released back to the pool of available processes, allowing it to be reused for dynamic transmissions. This prevents resource wastage and improves overall system efficiency.
2Reliability
If HARQ processes are reserved for semi-persistent transmissions, then the quality of service for semi-persistent services is improved, but the resource utilization efficiency deteriorates
Solution Approach 1:
The patent implements a mechanism to recover and reuse HARQ processes after successful semi-persistent transmissions. Instead of permanently reserving HARQ processes, the system releases them back to the available pool when transmissions are completed successfully, preventing resource wastage and improving overall resource utilization efficiency while maintaining QoS during active transmissions.
Solution Approach 2:
The patent changes the state parameter of HARQ processes from a static reserved state to a dynamic state that can transition between reserved, active, and available states. This parameter change enables the system to optimize resource allocation by adjusting HARQ process availability based on actual transmission requirements, thereby improving resource utilization efficiency.
3Reliability
If HARQ processes are reserved for semi-persistent transmissions, then the transmission reliability is improved, but the system adaptability deteriorates
Solution Approach 1:
The patent introduces dynamic HARQ process management that allows the system to adapt between semi-persistent and dynamic transmission modes. The HARQ process allocation is no longer fixed but dynamically adjusted based on transmission type and completion status, enabling the system to maintain reliability for semi-persistent transmissions while adapting to dynamic transmission requirements when resources become available.
Data Source
AI summary
A method and apparatus are disclosed for efficient hybrid automatic repeat request (HARQ) process utilization for semi-persistent and dynamic data transmissions, wherein a reserved HARQ process identification (ID) can be reused. A subset of a plurality of HARQ process IDs is reserved to use for a semi-persistent allocation, and data is transmitted based on the semi-persistent allocation. A dynamic allocation is received via a physical downlink control channel (PDCCH). At least one of the reserved HARQ process IDs is selectively used for transmitting data based on the dynamic allocation.