Multi-link Sidelink Beam Management for Blockage Resilience
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Solution Overview
Problem
Current mobile wireless communication systems, particularly in 5G NR, face challenges in establishing reliable sidelink communications due to susceptibility to blockages and interference, which can lead to link failures and packet loss, especially in scenarios like V2X and public safety, where direct communication paths are easily obstructed.
Innovation Solution
The implementation of a method where user equipment (UEs) exchange beamformed reference signals to identify preferred and non-preferred time-frequency-beam resources, allowing them to select and use multiple beams for communication, thereby introducing spatial diversity to maintain connectivity even when primary paths are attenuated, enhancing reliability and throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If single beam communication is used for sidelink, then device complexity is reduced, but reliability deteriorates due to susceptibility to blockages and interference
Solution Approach 1:
The patent segments the communication link into multiple independent beam pairs, each operating on different spatial paths. Instead of relying on a single beam, the system divides the communication into multiple parallel beams that can be independently managed and selected based on their reliability, thus improving overall communication reliability while keeping individual beam management complexity manageable.
Solution Approach 2:
The patent introduces spatial diversity by utilizing multiple dimensions (different spatial paths/beams) for communication. By establishing beam pairs across multiple spatial dimensions rather than relying on a single dimensional path, the system achieves improved reliability through spatial redundancy, where blockages in one spatial path do not necessarily affect other paths.
2Reliability
If multiple beams are established for spatial diversity, then reliability improves, but device complexity increases due to beam coordination and resource management
Solution Approach 1:
The patent performs preliminary beam identification and coordination through reference signal exchange before actual data transmission. By pre-establishing and evaluating multiple beam pairs using beamformed reference signals, the system prepares the spatial diversity paths in advance, selecting preferred beam pairs before communication begins. This preliminary action reduces the complexity of real-time beam management during active communication.
Solution Approach 2:
The patent implements feedback mechanisms where user equipment exchanges coordination information about preferred and non-preferred time-frequency-beam resources. This feedback allows the system to learn which beam pairs are effective and which should be avoided, enabling adaptive beam management that reduces complexity by focusing resources on reliable beams while automatically eliminating problematic ones.
3Measurement precision
If beamformed reference signals are exchanged for beam identification, then measurement precision improves, but use of energy increases due to additional signaling overhead
Solution Approach 1:
The patent applies partial action by exchanging beamformed reference signals only when needed for beam identification and coordination, rather than continuously. The system performs these measurements selectively during beam establishment phases or when beam reconfiguration is necessary, reducing unnecessary energy consumption while maintaining sufficient measurement precision for effective beam management.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach ensures robust sidelink communication by establishing multiple beam pairs, increasing reliability and reducing the need for retransmissions, while minimizing interference and maintaining communication quality even under blockages.
Implementation Method 1
exchanging, with the second user equipment, beamformed reference signals for identifying corresponding beams of the first user equipment and the second user equipment
Data Source
AI summary
Systems, methods, apparatuses, and computer program products for multi-link establishment for sidelink (SL) enhancement. A method may include transmitting, to a user equipment, a coordination request for communication over a plurality of beams. Beamformed reference signals may be exchanged with the user equipment identifying corresponding beams of the apparatus and the user equipment. Coordination information comprising at least one of preferred or non-preferred time-frequency-beam resources of the user equipment may be received from the user equipment including preferred or non-preferred radio resources of the user equipment and associated simultaneous links for their communication. At least one of preferred or non-preferred time-frequency-beam resources may be determined for their communication. At least two time-frequency-beam resources associated with different beams of the plurality of beams may be selected based on the at least one of determined preferred or non-preferred time-frequency-beam resources of the apparatus. Data in the selected at least two time-frequency-beam resources associated with different beams of the plurality of beams may be transmitted to the user equipment.