Uplink Scheduling Mechanism for Wireless Terminal
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Solution Overview
Problem
The existing radio communication systems, particularly in LTE and NR, lack a concrete procedure for efficiently transmitting uplink data, which hampers effective data transmission.
Innovation Solution
The implementation of specific methods and configurations in terminal and base station apparatuses, including the use of Physical Uplink Control Channel (PUCCH), Physical Uplink Shared Channel (PUSCH), and associated control elements, to manage uplink data transmission efficiently, such as through Semi-Persistent Scheduling (SPS) and dynamic grant mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional dynamic scheduling is used for uplink data transmission, then flexibility in resource allocation is improved, but transmission latency and signaling overhead increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring uplink resources through Semi-Persistent Scheduling (SPS) before data transmission is needed. The base station allocates uplink resources in advance and notifies the terminal apparatus, allowing immediate data transmission without waiting for dynamic scheduling grants, thus reducing transmission latency while maintaining resource allocation flexibility.
2Productivity
If dynamic scheduling with multiple grants is used, then resource utilization is improved, but signaling overhead and processing complexity increase
Solution Approach 1:
The patent implements periodic action through Semi-Persistent Scheduling where uplink resources are allocated periodically according to pre-configured parameters. Instead of processing multiple dynamic grants, the terminal apparatus transmits data at predetermined periodic intervals using pre-allocated resources, significantly reducing signaling overhead and processing complexity while maintaining efficient resource utilization.
3Loss of time
If Semi-Persistent Scheduling is implemented, then transmission latency is reduced, but resource allocation flexibility decreases
Solution Approach 1:
The patent applies dynamics by combining Semi-Persistent Scheduling with dynamic grant mechanisms. While SPS provides periodic resource allocation for regular traffic patterns, dynamic grants can be issued when needed to adapt to changing traffic conditions. This hybrid approach maintains the low latency benefits of SPS while restoring resource allocation flexibility when conditions require it.
Data Source
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AI summary
A terminal apparatus transmits capability information. The capability information includes a first capability parameter, a second capability parameter, and a third capability parameter. The first capability parameter indicates whether the terminal apparatus supports Semi-Persistent Scheduling in a primary cell. The second capability parameter indicates whether the terminal apparatus supports skipping of uplink transmission corresponding to a grant configured for a primary cell in a case that there is no available data for transmission in a buffer of the terminal apparatus. The third capability parameter indicates whether the terminal apparatus supports Semi-Persistent Scheduling in an LAA secondary cell, and whether the terminal apparatus supports skipping of uplink transmission corresponding to a grant configured for an LAA secondary cell in a case that there is no available data for transmission in the buffer of the terminal apparatus.