Sidelink Transmission Timing Alignment in Millimeter Wave Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing sidelink transmission timing, leading to interference and reduced reliability due to misalignment between uplink and sidelink transmission timing, which affects the base station's ability to receive uplink transmissions effectively.
Innovation Solution
A method where user equipment (UE) identifies a transmission beam for sidelink communication, requests resources from a base station, and receives timing information based on monitoring reference signals, allowing the UE to perform sidelink communication aligned with uplink transmissions to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sidelink transmissions are multiplexed with uplink transmissions, then transmission efficiency is improved, but interference between sidelink and uplink communications increases
Solution Approach 1:
The base station determines timing information for sidelink transmissions before granting resources to UEs. This timing information is calculated in advance based on the relationship between sidelink and uplink transmissions, allowing the UE to pre-align its sidelink transmission timing with the uplink timing structure, thereby preventing interference before it occurs
Solution Approach 2:
The patent changes the timing parameter of sidelink transmissions by introducing a timing offset (K2) that aligns sidelink transmission timing with uplink timing. The base station configures different timing values for different UEs based on their specific scenarios, transforming the timing parameter to achieve interference-free multiplexing
2Adaptability or versatility
If sidelink transmission timing is not aligned with uplink timing, then sidelink communication flexibility is maintained, but base station reception reliability deteriorates
Solution Approach 1:
The timing information for sidelink transmissions is made dynamic rather than fixed. The base station determines timing offsets based on real-time uplink scheduling decisions and transmits this timing information to UEs via resource grants. This allows the sidelink timing to adapt dynamically to different uplink scenarios while maintaining alignment, thus preserving both flexibility and reliability
3Manufacturing precision
If timing information is provided for each sidelink transmission, then transmission precision is improved, but signaling overhead increases
Solution Approach 1:
The timing information mechanism serves multiple functions simultaneously: it aligns sidelink transmission timing with uplink timing, provides resource allocation information, and enables interference coordination. By making the resource grant message multi-functional, the patent avoids additional dedicated signaling for timing information, thus reducing overhead while maintaining precision
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may transmit to a base station a request for resources including an indication of a transmission beam for performing a sidelink communication in a millimeter wave (mmW) system. The base station may determine a transmission configuration based on the request for resources. The UE may transmit reference signals based on the transmission configuration, and the base station may monitor for the reference signals using one or more reception beams. The base station may determine timing information for the sidelink communication, and transmit the timing information to the UE in a resource grant. Based on the timing information, the UE may perform the sidelink communication using the transmission beam. In some examples, the sidelink communication may be multiplexed in frequency from the perspective of the base station with an uplink transmission from another UE.