HARQ Process Scheduling via Discontinuous Indicator in Wireless Terminals
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Solution Overview
Problem
Conventional multiple TTI scheduling techniques struggle to maintain consecutive HARQ process numbers for multiple physical shared channels scheduled through a single DCI, leading to inefficiencies in data transmission and increased power consumption.
Innovation Solution
The method involves including a Discontinuous HARQ Process Indicator (DHPI) in the DCI, which informs whether each HARQ process number following the starting number is used, allowing for the transmission of discontinuous HARQ processes without increasing the size of the DCI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional multiple TTI scheduling techniques are used to schedule multiple physical shared channels through a single DCI, then the number of bits in DCI can be kept small, but the HARQ process numbers must be consecutive which reduces scheduling flexibility and data transfer efficiency
Solution Approach 1:
The patent segments the HARQ process number indication into two parts: a starting HARQ process number field and a discontinuous HARQ process indicator field. This segmentation allows the system to indicate non-consecutive HARQ processes while keeping the total bit length manageable, thus resolving the contradiction between DCI size and scheduling flexibility.
Solution Approach 2:
The patent introduces a dynamic indicator field that can flexibly specify which HARQ processes are used among multiple scheduled channels. This dynamic mechanism allows the system to adapt to different scheduling scenarios (consecutive or discontinuous HARQ processes) without increasing DCI size proportionally, enhancing scheduling flexibility while controlling complexity.
2Device complexity
If conventional multiple TTI scheduling techniques enforce consecutive HARQ process numbers, then DCI structure remains simple, but real-world wireless communication situations where HARQ process continuity is difficult to maintain cannot be handled
Solution Approach 1:
By dividing the HARQ process indication into a starting number field and a discontinuous indicator field, the patent enables the DCI structure to represent both consecutive and discontinuous HARQ processes. This segmentation maintains relative simplicity while improving reliability by accommodating real-world scenarios where HARQ process continuity cannot be guaranteed.
Solution Approach 2:
The patent changes the parameter representation from a single consecutive HARQ process number to a combination of starting number and discontinuous indicator. This parameter change allows the system to flexibly represent various HARQ process patterns, improving reliability without significantly complicating the DCI structure.
3Adaptability or versatility
If discontinuous HARQ processes are transmitted using conventional techniques, then data transfer flexibility improves, but the number of bits in DCI increases
Solution Approach 1:
The patent segments the indication mechanism into a compact starting HARQ process number field and a efficient discontinuous indicator field. This segmentation enables flexible representation of discontinuous HARQ processes while controlling the total bit length, thus achieving high adaptability without proportional increase in DCI complexity.
Solution Approach 2:
By changing from indicating each HARQ process number individually to indicating a starting number plus discontinuous pattern, the patent achieves efficient representation of discontinuous HARQ processes. This parameter change provides high flexibility in HARQ process assignment while minimizing the increase in DCI bit length.
Data Source
AI summary
A HARQ operation method of a UE in a wireless communication system, and an apparatus using the method are provided. The method comprises receiving one piece of DCI related to scheduling of a plurality of data channels, and receiving or transmitting at least one from the plurality of data channels based on the DCI. Each of the plurality of data channels is related to a different HARQ process number in an ascending order, the DCI includes information informing of the at least one data channel based on the HARQ process numbers, and the information includes i) a start HARQ process number from among HARQ process numbers related to the at least one data channel, and ii) a discontinuous HARQ process indicator (DHPI) informing whether each of HARQ process numbers next to the start HARQ process number from among the HARQ process numbers is used.