Uplink Control Channel Reconfiguration for Low-Latency Scheduling Requests
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in dynamically reconfiguring uplink control channel resources for scheduling requests due to latency issues with Layer 3 signaling, particularly in mobility scenarios, leading to delayed or missed transmissions.
Innovation Solution
Implementing Layer 1 signaling, such as downlink control information (DCI), to dynamically reconfigure uplink control channel resources and transmission configuration indicator states for scheduling requests, allowing for quicker adjustments without the latency associated with Layer 3 signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Layer 3 signaling is used to reconfigure uplink control channel resources, then configuration reliability is improved, but reconfiguration speed deteriorates
Solution Approach 1:
The patent segments the reconfiguration process into two parts: Layer 3 signaling for reliable configuration setup and Layer 1 signaling for rapid activation. This allows the system to achieve both reliability through Layer 3 and speed through Layer 1, resolving the contradiction between these two requirements.
Solution Approach 2:
The patent applies preliminary action by pre-configuring multiple PUCCH resources through Layer 3 signaling before the actual reconfiguration event. When mobility occurs, the base station only needs to activate a pre-configured resource via fast Layer 1 signaling, avoiding the need for slow real-time Layer 3 reconfiguration while maintaining reliability.
2Reliability
If Layer 3 signaling is used for scheduling request reconfiguration, then signaling reliability is improved, but transmission latency increases
Solution Approach 1:
The patent divides the signaling process into Layer 3 for reliable configuration establishment and Layer 1 for time-critical activation. This segmentation allows the system to achieve both signaling reliability and reduced transmission latency by using the appropriate layer for each function.
Solution Approach 2:
The patent uses preliminary action by pre-establishing multiple PUCCH resources and their associations with TCI states through Layer 3 signaling. When a scheduling request needs to be transmitted, the base station can quickly activate the appropriate pre-configured resource via Layer 1 signaling, minimizing transmission latency while maintaining reliability.
3Productivity
If dynamic reconfiguration is implemented, then transmission efficiency is improved, but system complexity increases
Solution Approach 1:
The patent segments the reconfiguration function across Layer 3 and Layer 1, with Layer 3 handling configuration setup and Layer 1 handling activation. This segmentation improves transmission efficiency for mobility scenarios while keeping the complexity manageable by assigning specific functions to appropriate layers.
Solution Approach 2:
The patent applies preliminary action by pre-configuring multiple PUCCH resources and their mappings to TCI states through Layer 3 signaling. This allows the system to achieve dynamic reconfiguration efficiency without implementing full complexity at all times, as the heavy configuration work is done in advance.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. In a wireless communications system, a user equipment (UE) may receive a first downlink control message indicating a set of parameters for a scheduling request for the UE. The UE may then receive on a receive beam a second downlink control message, which may be a layer 1 signal, and determine uplink resources for the scheduling request and a transmission configuration indicator state for the scheduling request. The UE may transmit, to the base station, the scheduling request using the uplink resources.