HARQ-ACK Delay Scheduling for LTE-MTC Cat M1 UEs
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Solution Overview
Problem
The introduction of 14 HARQ processes in DL for HD-FDD Cat M1 UEs in LTE-MTC does not consider further delays caused by coexistence with PUCCH repetitions, invalid BL/CE DL subframes, invalid BL/CE UL subframes, and measurement gaps, which impact HARQ-ACK delays.
Innovation Solution
A selective HARQ-ACK delay counting strategy is implemented to determine scheduling delays in the presence of PUCCH repetitions, invalid BL/CE DL subframes, invalid BL/CE UL subframes, and measurement gaps, using HARQ-ACK bundling for Cat M1 HD-FDD UEs, with specific delay values and counting strategies to accommodate these scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If 14 HARQ processes are introduced in DL for HD-FDD Cat M1 UEs, then peak data rate is improved, but scheduling delay complexity increases due to coexistence with PUCCH repetitions, invalid BL/CE DL subframes, invalid BL/CE UL subframes, and measurement gaps
Solution Approach 1:
The patent introduces multiple HARQ-ACK delay values (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15) to accommodate different scheduling scenarios when 14 HARQ processes are used. This parameter expansion allows the system to handle additional delay variations caused by PUCCH repetitions, invalid subframes, and measurement gaps while maintaining 14 HARQ processes for improved peak data rate
Solution Approach 2:
The patent implements dynamic HARQ-ACK delay selection based on the presence or absence of specific conditions (PUCCH repetitions, invalid BL/CE DL subframes, invalid BL/CE UL subframes, measurement gaps). The system dynamically adjusts the HARQ-ACK delay value according to the actual scheduling scenario, enabling flexible adaptation to varying system conditions while supporting 14 HARQ processes
2Adaptability or versatility
If additional HARQ-ACK delay values are introduced to accommodate PUCCH repetitions and invalid subframes, then scheduling flexibility is improved, but system complexity increases
Solution Approach 1:
The patent segments the HARQ-ACK delay into multiple discrete values (0-15) that can be independently selected based on specific scheduling conditions. Each delay value corresponds to particular combinations of PUCCH repetitions, invalid subframes, and measurement gaps, allowing the system to handle diverse scenarios through discrete parameter selection rather than complex continuous adjustment
Solution Approach 2:
The patent pre-defines a comprehensive set of HARQ-ACK delay values (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15) that cover all possible scheduling scenarios including PUCCH repetitions, invalid BL/CE DL subframes, invalid BL/CE UL subframes, and measurement gaps. This preliminary preparation eliminates the need for complex real-time calculations, reducing system complexity while maintaining high scheduling flexibility
Data Source
AI summary
The present application generally relates to wireless communication technology. More particularly, the present application relates to a method and apparatus for scheduling delay associated with HARQ processes in LTE-MTC. The present application also relates to computer program product adapted for the same purpose. According to one embodiment, a method for scheduling delay associated with HARQ processes in LTE-MTC comprises: —a) in response to presence or non-presence of PUCCH repetition, invalid BL/CE DL subframe, invalid BL/CE UL subframe, and measurement gap, determining a HARQ-ACK scheduling counting strategy; and —b) scheduling a HARQ-ACK delay value in accordance with the HARQ-ACK scheduling counting strategy.