Dual Uplink Control Transmission Across Non-Collocated Cell Groups
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Solution Overview
Problem
In wireless communications systems, PUCCH transmissions between non-collocated cell groups experience latency issues due to backhaul communications, failing to meet associated latency requirements.
Innovation Solution
The proposed solution involves transmitting uplink control information (UCI) associated with a second cell group to a first cell group, where the transmission is governed by parameters such as UCI payload type or size, allowing for efficient communication across non-collocated cell groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UCI is transmitted only to the second cell in the second cell group, then the transmission path is simple, but latency requirements are not met due to backhaul communication delays between non-collocated cell groups
Solution Approach 1:
The patent segments the UCI transmission by dividing it into two paths: one to the second cell (SCG) and another to the first cell (MCG). This segmentation allows critical UCI to bypass backhaul delays by being transmitted directly to the MCG, thereby meeting latency requirements while maintaining manageable transmission configuration through parameter-based control.
Solution Approach 2:
The first cell (MCG) acts as an intermediary for UCI transmission from the second cell group. By forwarding UCI through the MCG path, the system bypasses the latency bottleneck of direct SCG backhaul communication, effectively using the MCG as a mediator to achieve lower latency while keeping the overall transmission configuration manageable.
2Reliability
If UCI is transmitted to both first cell and second cell, then latency requirements are met, but transmission overhead increases
Solution Approach 1:
The patent dynamically changes transmission parameters (such as UCI payload type, size, and transmission path selection) based on channel conditions, traffic type, and latency requirements. This allows the system to transmit to both cells only when necessary, meeting latency requirements while minimizing transmission overhead by adapting parameters to current conditions rather than always using dual transmission.
Solution Approach 2:
The transmission configuration is made dynamic, allowing the UE to adaptively select whether to transmit UCI to the first cell, second cell, or both, based on real-time parameters such as channel quality, UCI type, and latency requirements. This dynamic approach ensures latency requirements are met only when necessary, reducing overall transmission overhead compared to static dual-cell transmission.
3Productivity
If UCI transmission path is fixed to second cell only, then configuration is simple, but communication efficiency decreases for non-collocated cell groups
Solution Approach 1:
The patent implements dynamic transmission path selection where the UE can adaptively choose to transmit UCI to the first cell, second cell, or both based on real-time parameters including channel conditions, UCI type, and cell group collocation status. This dynamic configuration improves communication efficiency for non-collocated cell groups by enabling direct MCG transmission when needed, while keeping the configuration manageable through parameter-based control rather than complex hardwired paths.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive signaling indicating a configuration for communications via a first cell group and a second cell group, the first cell group comprising a first cell used for transmission of uplink control information (UCI) associated with the first cell group and the second cell group comprising a second cell used for transmission of UCI associated with the second cell group. The UE may transmit UCI associated with the second cell group to the first cell in the first cell group, to the second cell in the second cell group, or to both the first cell and the second cell, wherein transmitting the UCI associated with the second cell group to the first cell, to the second cell, or to both the first cell and the second cell is in accordance with a parameter associated with the UCI.