Aperiodic Uplink Transmission via Dynamic DCI Indicators
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Solution Overview
Problem
Current wireless communication systems face challenges in transmitting uplink control information without a configured control channel resource, particularly for urgent services like URLLC, due to restrictions that lead to increased latency and overhead, especially when switching between UL and SUL component carriers.
Innovation Solution
The method involves a user equipment (UE) receiving downlink control information to determine resource allocation for aperiodic uplink transmission in a supplementary uplink carrier without a PUCCH resource configuration, using indicators like UL/SUL carrier indicators, ARI, SRS request fields, and HARQ timing indicators to dynamically allocate resources for transmitting uplink control information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If PUCCH resource configuration is restricted for SUL component carriers to avoid overhead, then resource allocation efficiency is improved, but latency increases for urgent services
Solution Approach 1:
The patent implements dynamic resource allocation by introducing a dynamic indicator field in DCI that enables flexible switching between configured PUCCH resources and dynamically allocated resources. This dynamic mechanism allows the system to adapt resource allocation based on service requirements, resolving the contradiction between avoiding overhead and reducing latency for urgent services.
Solution Approach 2:
The patent changes the parameter of resource allocation from static (pre-configured PUCCH resources) to dynamic (indicator-based allocation). By modifying the DCI format to include resource allocation indicators, the system can quickly adjust resource assignment without RRC reconfiguration, thereby reducing latency while maintaining efficiency.
2Adaptability or versatility
If RRC reconfiguration is performed to allocate PUCCH resources for SUL carrier, then resource allocation flexibility is improved, but signaling overhead and latency increase
Solution Approach 1:
The patent segments the resource allocation process into two parts: pre-configuration of multiple PUCCH resource options and dynamic selection via DCI indicator. This segmentation avoids the need for complete RRC reconfiguration while maintaining flexibility, as the system only needs to signal the selected resource index rather than reconfiguring the entire PUCCH setup.
Solution Approach 2:
The patent performs preliminary action by pre-configuring multiple PUCCH resource options through RRC signaling before actual transmission. This preliminary configuration eliminates the need for RRC reconfiguration during urgent transmissions, as the system can immediately select from pre-available resources using the dynamic indicator, thereby reducing signaling overhead and latency.
3Loss of time
If dynamic resource allocation is implemented without PUCCH configuration, then latency is reduced, but resource allocation complexity increases
Solution Approach 1:
The patent makes the DCI format universal by designing it to handle both traditional scheduled uplink and aperiodic PUCCH transmission indications. The same DCI structure and indicator fields are used for different purposes, simplifying the overall system complexity despite enabling dynamic resource allocation without PUCCH configuration.
Data Source
AI summary
A method for a user equipment (UE) is disclosed. The method includes receiving, by the UE, downlink control information (DCI) for a downlink (DL) scheduling assignment (DL-DCI), the DL-DCI indicating a first uplink (UL) carrier associated with a Physical Uplink Control Channel (PUCCH) resource configuration for transmitting an aperiodic UL transmission for uplink control information (UCI), and transmitting, by the UE, the aperiodic UL transmission for UCI in a second UL carrier without a PUCCH resource configuration, where the UE determines a resource allocation of the second UL carrier based on the DL-DCI. The DL-DCI includes at least one of: a UL/supplementary UL (SUL) carrier indicator, a Hybrid Automatic Repeat reQuest (HARQ)-ACK resource indicator (ARI), a sounding reference signal (SRS) request field, a HARQ timing indicator, or a channel station information (CSI) request.