Terminal Apparatus Uplink Scheduling for HARQ-ACK and RI Transmission
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Solution Overview
Problem
Current LTE technologies face inefficiencies in uplink transmission and reception, particularly in handling HARQ-ACK and CSI reports over PUSCH in carrier aggregation scenarios, especially in Licensed Assisted Access (LAA) environments.
Innovation Solution
The solution involves a terminal apparatus and base station apparatus configured to receive and transmit HARQ-ACK and CSI reports on the PUSCH, with the index of the SC-FDMA symbol for RI transmission determined based on the HARQ-ACK request, enabling efficient uplink transmission and reception by optimizing the scheduling and reporting processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If HARQ-ACK and CSI reports are transmitted on PUSCH in carrier aggregation scenarios, then uplink transmission capability is improved, but determination of transmission timing and resource allocation becomes complex
Solution Approach 1:
The patent changes the parameter used for determining RI transmission timing from fixed rules to dynamic values based on HARQ-ACK request fields. Specifically, the SC-FDMA symbol index for RI transmission is determined by values in the uplink grant (such as N_pd and N_s), allowing flexible adjustment of transmission timing parameters to resolve conflicts between HARQ-ACK and RI transmissions
Solution Approach 2:
The patent introduces dynamic determination mechanisms where the transmission timing and resource allocation are not fixed but adapt based on current transmission conditions. The RI transmission timing dynamically adjusts according to HARQ-ACK request field values, and resource allocation changes based on whether HARQ-ACK or RI is being transmitted, making the system responsive to real-time requirements
2Ease of operation
If RI transmission timing is fixed, then resource allocation is simplified, but conflict with HARQ-ACK transmission cannot be avoided
Solution Approach 1:
The patent applies preliminary action by determining the RI transmission timing in advance based on predicted HARQ-ACK transmission requirements. The uplink grant includes pre-calculated timing information (N_pd, N_s values) that anticipate potential conflicts, allowing the terminal to proactively adjust RI transmission timing before conflicts occur, rather than reacting after conflicts arise
Solution Approach 2:
The patent introduces intermediary parameters (N_pd, N_s fields in uplink grant) that mediate between fixed resource allocation and dynamic conflict avoidance. These intermediary values serve as adjustment factors that reconcile the simplicity of fixed allocation with the need for flexible conflict resolution, acting as a buffer between the two requirements
Data Source
AI summary
A terminal apparatus receives an uplink grant used to schedule a PUSCH; transmits, in a case that an HARQ-ACK request included in the uplink grant is set so as to trigger transmission of an HARQ-ACK, the HARQ-ACK on the PUSCH corresponding to the uplink grant; and transmits, in a case that a CSI request included in the uplink grant is set so as to trigger a CSI report, an RI on the PUSCH corresponding to the uplink grant, in which an index of an SC-FDMA symbol in which the RI is transmitted is provided based on a value of the HARQ-ACK request.