Uplink Transmission with Dynamic TRP and Beam Switching
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Solution Overview
Problem
Current 3GPP specifications do not support dynamic switching among different Transmission and Reception Points (TRPs) or beams for uplink transmission in New Radio (NR) networks, limiting flexibility and efficiency in communication.
Innovation Solution
A method and device that enable a terminal device to determine precoding information based on Channel State Information-Reference Signals (CSI-RS) from multiple TRPs, allowing dynamic selection of TRPs for uplink transmission and configuring SRS transmission accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If beam for UL transmission is configured via higher layer signaling only, then configuration simplicity is maintained, but dynamic switching among different TRPs or beams cannot be supported
Solution Approach 1:
The patent enables dynamic beam switching by allowing the terminal to determine precoding information based on CSI-RS resources associated with different TRPs. The terminal can dynamically select which TRP to transmit uplink signals to, rather than being statically configured. This is achieved through the network configuring multiple CSI-RS resources corresponding to different TRPs and the terminal selecting appropriate precoding based on channel measurements.
Solution Approach 2:
The patent changes the configuration parameter from static higher-layer signaling to dynamic physical layer signaling. By introducing DCI-based indication of SRS resources and precoding information, the system enables rapid beam switching without requiring complex reconfiguration procedures. The precoding information and TRP selection are dynamically adjusted through parameter changes in the physical layer.
2Adaptability or versatility
If multiple TRPs are equipped for UL transmission, then communication flexibility is improved, but current specifications cannot support dynamic TRP switching
Solution Approach 1:
The terminal device autonomously determines precoding information and selects the appropriate TRP for uplink transmission based on channel measurements of CSI-RS from multiple TRPs. The network configures the necessary resources but does not need to explicitly control each switching decision. This self-service mechanism simplifies network operation while enabling flexible TRP selection.
Solution Approach 2:
The terminal measures channel quality from multiple TRPs using CSI-RS and uses this feedback information to determine the best TRP for uplink transmission. The precoding information is derived from these measurements, creating a closed-loop system where channel feedback drives dynamic TRP selection and beam management.
3Productivity
If precoding information is determined from CSI-RS measurements, then uplink transmission performance is optimized, but dynamic TRP switching capability is required which is not currently supported
Solution Approach 1:
The network pre-configures multiple CSI-RS resources corresponding to different TRPs before uplink transmission. The terminal uses these pre-configured resources to perform channel measurements and determine precoding information. This preliminary configuration enables rapid dynamic switching without requiring real-time reconfiguration during transmission.
Solution Approach 2:
CSI-RS serves as an intermediary that carries channel state information from multiple TRPs to the terminal. By measuring these reference signals, the terminal can determine precoding information and select the optimal TRP for uplink transmission. The DCI message acts as another intermediary to indicate which SRS resources and precoding should be used.
Data Source
Figure 1A~1C
Figure 2
Figure 3~4A
AI summary
Embodiments of the present disclosure relate to methods, devices and computer readable mediums for uplink transmission. In example embodiments, a method implemented at a terminal device is provided. The method comprises, in response to being configured with at least one SRS resource set by a network device and the at least one SRS resource set being associated with first and second CSI-RS resources, receiving, from the network device, a first CSI-RS transmitted via a first TRP over the first CSI-RS resource and a second CSI-RS transmitted via a second TRP over the second CSI-RS resource. The method further comprises determining, based on the received first and second CSI-RSs, first precoding information for uplink transmission via the first TRP and second precoding information for uplink transmission via the second TRP respectively. The method further comprises determining, from the first and second TRPs, at least one TRP for uplink transmission, the at least one TRP being associated with third precoding information selected from the first and second precoding information. In addition, the method further comprises transmitting, based on the third precoding information, at least one SRS to the network device via the at least one TRP.