Sidelink Reference Signal Multiplexing via Cyclic Shifts
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Solution Overview
Problem
Current beam training methods for multiple transmitting user equipment (UEs) in wireless communication systems are inefficient, leading to increased transmission times, power consumption, and reduced signal quality.
Innovation Solution
The method involves transmitting sidelink reference signals with cyclic shifts, allowing for multiplexing of multiple UEs' signals onto the same resources, and using beam training reports to select optimal beams for data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If beam training is performed for multiple transmitting UEs using separate reference signals, then each UE can be trained individually, but transmission time increases and resource efficiency decreases
Solution Approach 1:
The patent combines beam training for multiple transmitting UEs into a single reference signal transmission by applying different cyclic shifts to each UE's reference signal. This allows the receiving UE to simultaneously train with all transmitting UEs using one resource, rather than requiring separate resources for each UE, thereby reducing transmission time while maintaining individual beam training accuracy through the cyclic shift differentiation.
2Measurement precision
If beam training is performed for multiple transmitting UEs using separate reference signals, then each UE can be trained individually, but power consumption increases
Solution Approach 1:
The patent merges the beam training process for multiple transmitting UEs into a single reference signal transmission event. By using cyclic shifts to differentiate between UEs within the same resource block, the system reduces the total number of transmissions required, thereby lowering the cumulative power consumption across all participating UEs while still achieving individual beam training for each UE.
3Device complexity
If reference signal density is limited to one per resource block, then resource allocation is simplified, but signal quality and beam training effectiveness are reduced
Solution Approach 1:
The patent changes the parameter of reference signal differentiation by introducing cyclic shifts. Instead of increasing reference signal density (which would complicate resource allocation), the system maintains one reference signal per resource block but applies different cyclic shift values to each transmitting UE's signal. This parameter change allows multiple UEs to be trained simultaneously on the same resource while preserving signal quality and beam training effectiveness through the cyclic shift-based differentiation.
Data Source
AI summary
Sidelink reference signal (SL-RS) configurations are determined for transmission from multiple transmitting user equipment devices (UE) to one receiving UE. A master wireless communications device is assigned from among the transmitting UEs, the receiving UE, or a base station. The master wireless communications device assigns a sidelink reference signal configuration to each participating UE. The sidelink reference signal configuration may include a designation of resources for the SL-RS, a cyclic shift, a comb offset, a port, or report configurations. By adding a cyclic shift, comb offset, port, or report configuration, SL-RS signals from the transmitting UEs may be multiplexed and transmitted to the receiving UE using the same sidelink resources. Thus, transmitting UEs may be trained to select optimum beams, according to the assigned SL-RS configuration of each, and may transmit a same transport block (TB), a joint TB, or a different TB.