User Equipment Relaying With Reference-Guided Mini-Slot Selection
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently relaying data using mini-slots and sub-bands, as relay user equipment (UE) lacks the capability to determine optimal mini-slots or sub-bands for data transmission based on reference signal measurements.
Innovation Solution
The relay UE identifies a select mini-slot or sub-band for data transmission by utilizing reference signal measurements indicated per mini-slot or sub-band, enabling efficient packet relaying through amplify-and-forward or decode-and-forward operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If relay UE uses traditional slot-based transmission without mini-slot selection, then device complexity is reduced, but data relay efficiency and latency performance deteriorate
Solution Approach 1:
The patent segments the traditional transmission slot into multiple mini-slots, allowing the relay UE to select optimal mini-slots for data transmission based on reference signal measurements. This segmentation enables finer-grained resource allocation, improving data relay efficiency by allowing transmission in the best mini-slot while reducing latency through faster resource selection.
Solution Approach 2:
The relay UE performs preliminary measurements of reference signals (such as SSB or CSI-RS) associated with different mini-slots before actual data transmission. These pre-measurements allow the UE to identify and select the optimal mini-slot in advance, enabling efficient resource allocation and reducing transmission latency without requiring complex real-time decision-making.
2Reliability
If relay UE performs reference signal measurements per mini-slot for optimization, then data transmission quality improves, but measurement and detection difficulty increases
Solution Approach 1:
The patent utilizes existing reference signal structures (SSB and CSI-RS) that are already defined in the 5G NR standard for multiple purposes. These reference signals serve both their original functions (channel estimation, synchronization) and the additional function of enabling mini-slot selection for relaying. This multi-functionality approach improves communication quality through accurate channel assessment while avoiding the need to design and implement entirely new measurement mechanisms.
3Loss of time
If relay UE selects optimal mini-slots based on reference signal measurements, then latency is reduced, but device complexity increases
Solution Approach 1:
The patent introduces dynamic mini-slot selection capability where the relay UE can adaptively choose the optimal mini-slot for each data transmission based on real-time reference signal measurements. This dynamic approach reduces latency by allowing flexible resource allocation rather than being constrained to fixed slot boundaries, while the selection process leverages existing measurement capabilities to minimize the increase in device complexity.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a relay user equipment (UE) may receive a packet from a source node. The UE may identify a select mini-slot or a select sub-band for transmitting the packet based at least in part on a reference signal measurement that is indicated per mini-slot of a plurality of mini-slots or per sub-band of a plurality of sub-bands. The UE may transmit the packet to a destination node using the select mini-slot or the select sub-band. Numerous other aspects are described.