PUSCH Multi-Panel Uplink for Low-Delay Multi-TRP Transmission
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Solution Overview
Problem
Existing technologies for Physical Uplink Shared Channel (PUSCH) transmission to multiple Transmission and Reception Points (TRPs) suffer from large transmission delays due to time division multiplexing methods, which do not effectively utilize the capabilities of multi-panel terminals for simultaneous beam transmission.
Innovation Solution
Implementing a method and apparatus for PUSCH transmission that allows simultaneous transmission of transport blocks from different antenna panels to multiple TRPs using the same data layer, associated with demodulation reference signal (DMRS) ports, enabling a simultaneous multi-panel mode to enhance reliability and throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If time division multiplexing is used to transmit the same information to different TRPs through different Transmission Occasions, then transmission reliability is improved, but transmission delay increases
Solution Approach 1:
The patent merges multiple transmission paths by transmitting the same transport block simultaneously through multiple antenna panels to multiple TRPs using the same time-frequency resources. This combining of parallel transmission paths achieves both reliability (through diversity) and low latency (through simultaneity), resolving the contradiction between reliability and transmission delay that plagued TDM-based approaches.
Solution Approach 2:
The patent transitions from time-domain multiplexing to spatial-domain multiplexing by utilizing multiple antenna panels and their corresponding spatial dimensions. Instead of sending repetitions at different times (TDM), the system sends simultaneous copies through different spatial paths (different antenna panels to different TRPs), thereby eliminating time delay while maintaining reliability through spatial diversity.
2Loss of time
If simultaneous transmission via multi-panel is implemented using the same data layer on the same time-frequency resource, then transmission delay is reduced, but system complexity increases
Solution Approach 1:
The patent makes the same data layer serve multiple TRPs simultaneously through different antenna panels, achieving multi-functionality from a single data layer. This universal approach allows one data layer to be transmitted to multiple destinations concurrently, reducing the need for separate data layers for each TRP and thereby managing system complexity while enabling simultaneous transmission.
Solution Approach 2:
The patent creates copies of the same data layer transmission across multiple antenna panels simultaneously. By copying the data layer to multiple spatial paths (antenna panels) that lead to different TRPs, the system achieves parallel transmission without requiring fundamentally new transmission mechanisms, thus managing complexity while enabling low-latency simultaneous delivery.
3Productivity
If multiple antenna panels transmit to multiple TRPs simultaneously, then throughput is enhanced, but channel estimation difficulty increases
Solution Approach 1:
The patent segments the channel estimation problem by associating each antenna panel's transmission with dedicated DMRS ports or port groups. This segmentation allows the receiver to estimate channels for each antenna panel separately using its corresponding DMRS, rather than attempting to estimate all channels simultaneously, thereby managing estimation complexity while enabling high-throughput multi-panel transmission.
Solution Approach 2:
The patent introduces DMRS ports/port groups as intermediaries between the antenna panels and the receiver. These reference signals serve as mediators that facilitate channel estimation for each antenna panel's transmission path, making the complex multi-panel channel estimation task manageable by providing dedicated reference points for each spatial path.
Data Source
AI summary
A physical uplink shared channel (PUSCH) transmission method and apparatus, a medium, and a product, relating to the field of communications. The method includes: separately transmitting, on a same time frequency resource in a same slot from different panels by means of a same data layer or a data layer set, one transport block (TB) carried by a PUSCH, wherein the TB is transmitted by means of simultaneous transmission via multi-panel from multiple panels to multiple transmission and reception points (TRPs), and data layers/data layer sets transmitted by different panels are associated with a demodulation reference signal (DMRS) port/port group.