Dynamic HARQ Reservation for SPS and Normal LTE Transmissions
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Solution Overview
Problem
In LTE mobile-radio networks, the fixed assignment of HARQ process numbers for semi-persistent transmission resources leads to a shortage of available HARQ processes for normal transmission resources, causing data rate issues, as these process numbers are reserved and not freely available for other resources.
Innovation Solution
A method and device that dynamically reserve HARQ process numbers for semi-persistent transmission resources, allowing some to be used for normal transmission resources while ensuring at least one HARQ process is always available for SPS-configured resources, by adjusting the number of reserved processes based on the transmission period and channel quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ process numbers are fixedly assigned to semi-persistent transmission resources, then reliability of SPS transmission is improved, but availability of HARQ processes for normal transmission resources deteriorates
Solution Approach 1:
The patent implements dynamic HARQ process number reservation where the number of reserved processes for SPS resources is not fixed but adapts based on current system conditions. The base station dynamically adjusts the reservation based on the period of SPS resources and current channel quality, allowing the system to balance between SPS reliability and normal transmission availability according to real-time needs.
2Reliability
If all HARQ process numbers are reserved for SPS-configured transmission resources, then reliability of SPS transmission is improved, but data rate of normal transmission resources deteriorates
Solution Approach 1:
The patent changes the parameter of HARQ process number reservation from a static all-or-nothing approach to a dynamic partial reservation approach. The base station reserves only a subset of HARQ process numbers for SPS resources, specifically determining the number to reserve based on the SPS period and channel conditions, thereby maintaining SPS reliability while preserving sufficient processes for normal transmissions to sustain data rate.
3Reliability
If number of reserved HARQ processes is increased, then reliability of SPS transmission is improved, but availability for other transmission resources deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the base station continuously monitors channel quality and SPS transmission performance, then adjusts the number of reserved HARQ processes accordingly. When channel quality is good and SPS transmissions are successful, fewer processes are reserved for SPS, freeing up more for normal resources. When channel quality deteriorates or SPS failures occur, more processes are reserved to ensure SPS reliability, creating a dynamic balance through continuous feedback.
Data Source
AI summary
The method is used for detection and/or removal of errors in transmission systems which comprise a transmitter unit and at least one receiver unit. The transmitter unit transmits to the receiver unit on a semi-persistent transmission resource which provides an adjustable frequency range and an adjustable time period. Furthermore, the self-repeating, semi-persistent transmission resource repeating with the period TSPS is rigidly assigned to the receiver unit. Following this, at least one but not all of the HARQ process numbers available for the self-repeating, semi-persistent transmission resource are reserved for the latter.