Spatial Multiplexing for Simultaneous Uplink Channel Transmission
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Solution Overview
Problem
Current wireless communication systems face challenges in simultaneously transmitting multiple uplink channels using the same time and frequency resources, leading to collisions and increased complexity, particularly when multiple transmissions occur simultaneously.
Innovation Solution
The implementation of spatial multiplexing techniques allows user equipment (UE) to transmit multiple uplink channels, such as PUCCH, PUSCH, and SRS, on the same set of time/frequency resources by using different antenna ports and spatial parameters, avoiding collisions and enabling simultaneous transmission to the same or different transmission/reception points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple uplink channels are transmitted simultaneously using the same time and frequency resources, then transmission efficiency and spectral utilization are improved, but signal collisions and interference occur leading to transmission failures
Solution Approach 1:
The patent introduces spatial dimension as an additional resource dimension for multiplexing uplink channels. By transmitting multiple channels simultaneously on the same time-frequency resources but through different spatial paths (different antenna ports with different spatial parameters), the system achieves channel separation without resource allocation conflicts, thereby improving transmission efficiency while maintaining reliability through spatial isolation of signals
2Reliability
If multiple uplink channels are transmitted simultaneously using different time or frequency resources, then signal collisions are avoided, but resource utilization efficiency decreases
Solution Approach 1:
Instead of separating channels in time or frequency domains, the patent utilizes the spatial domain as an additional dimension for channel separation. Multiple uplink channels are transmitted simultaneously on overlapping time-frequency resources but through different spatial paths defined by distinct antenna ports and spatial parameters, achieving both collision avoidance and high resource utilization efficiency
3Productivity
If spatial multiplexing is implemented for simultaneous uplink transmissions, then resource utilization and transmission efficiency are improved, but system complexity increases due to multiple spatial parameters
Solution Approach 1:
The patent applies universal spatial parameters (antenna ports, spatial domain precoders, number of layers) across different types of uplink channels (PUCCH, PUSCH, SRS). This multi-functional approach allows the same spatial multiplexing mechanism to handle various channel types uniformly, reducing the need for channel-specific complex processing while maintaining high resource utilization efficiency
Data Source
AI summary
A spatial multiplexing configuration may enable a user equipment (UE) to spatially multiplex two or more uplink channels of different types for simultaneous transmission. For example, a UE may receive an indication of a spatial multiplexing configuration from a base station. The UE may identify two or more uplink channels for simultaneous transmission on a same component carrier, where each uplink channel may be a different type. In such cases, the UE may spatially multiplex the two or more uplink channels on a same set of time/frequency resources on the component carrier in accordance with the spatial multiplexing configuration. The spatially multiplexed uplink channels may then be simultaneously transmitted by the UE on the set of resources, where the spatially multiplexed uplink channels may be simultaneously sent to the same base station or to different base stations. Additionally, different spatial parameters may be applied to each uplink channel.