PUSCH Frequency Hopping Interval Adaptation via RNTI
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Solution Overview
Problem
Current communication systems, particularly in the context of LTE and New Radio (NR), face inefficiencies in scheduling and frequency hopping mechanisms for PUSCH transmissions, which affect the overall performance and efficiency of terminal and base station apparatuses.
Innovation Solution
Implementing frequency hopping for PUSCH based on DCI or random access response grants, with specific intervals determined by higher layer parameters, such as using one slot for TC-RNTI scheduled PUSCH and a variable number of slots for C-RNTI, CS-RNTI, or MCS-C-RNTI scheduled PUSCH.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frequency hopping for PUSCH is performed based on DCI or random access response grant, then communication efficiency is improved, but scheduling complexity increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the frequency hopping interval based on the RNTI type used for CRC scrambling. For TC-RNTI and random access response grants, the frequency hopping interval is set to one slot, while for C-RNTI, CS-RNTI, or MCS-C-RNTI, the interval is determined by a higher layer parameter. This selective parameter adjustment optimizes communication efficiency for different scheduling scenarios while managing complexity through conditional logic rather than universal complexity.
2Speed
If frequency hopping interval is set to one slot for TC-RNTI scheduled PUSCH, then responsiveness is improved, but flexibility is reduced
Solution Approach 1:
The patent implements dynamics by making the frequency hopping interval adaptive rather than fixed. The interval dynamically changes based on the RNTI type: it is fixed at one slot for TC-RNTI and random access response grants to ensure responsiveness, while for C-RNTI, CS-RNTI, or MCS-C-RNTI, it becomes configurable through higher layer parameters to provide flexibility. This dynamic adjustment resolves the contradiction between responsiveness and flexibility.
Data Source
AI summary
A terminal apparatus includes a receiver that receives a PDCCH to which DCI is mapped or receives a PDSCH including a random access response grant, and a transmitter that transmits a PUSCH. Frequency hopping for the PUSCH is performed based at least on the DCI or the random access response grant. In a case that the PUSCH is scheduled by the DCI with a CRC scrambled by a TC-RNTI, a frequency hopping interval corresponding to the frequency hopping is one slot. In a case that the PUSCH is scheduled by the random access response grant, the frequency hopping interval is one slot. In a case that the PUSCH is scheduled by the DCI with a CRC scrambled by at least one of a C-RNTI, a CS-RNTI, or an MCS-C-RNTI, the number of slots for the frequency hopping interval is determined by a certain higher layer parameter.