Uplink Reliability in Multi-TRP Wireless Systems
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Solution Overview
Problem
In wireless communication systems, using a beam and/or power control parameters for one Transmitter Receiver Point (TRP)/panel to transmit data for another TRP/panel without beam indication information leads to a significant reduction in transmission performance when a User Equipment (UE) is served by multiple TRPs/panels.
Innovation Solution
The method involves creating an implicit connection between the scheduling signaling and the radio resource, using a spatial domain transmission filter and/or transmitting power for the target receiver, and determining the reference signal through the scheduling signaling to avoid using incorrect beams and power settings, ensuring reliable uplink transmissions without explicit indication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UE is served by multiple TRPs/panels without beam indication information in scheduling signaling, then the UE can be served by multiple TRPs/panels simultaneously to improve robustness and throughput, but using a beam/power control parameter for one TRP/panel to transmit data for another TRP/panel leads to a significant reduction in transmission performance
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple reference signals (first reference signal and second reference signal) associated with different TRPs/panels before actual data transmission. The UE measures these reference signals in advance to determine spatial domain transmission filters and power control parameters for each TRP/panel, so that when scheduling signaling arrives without explicit beam indication, the UE can immediately use the pre-determined parameters corresponding to the appropriate TRP/panel, avoiding the need to incorrectly reuse parameters from other TRPs/panels.
Solution Approach 2:
The patent introduces an intermediary mechanism through the association between scheduling signaling and reference signals. The scheduling signaling implicitly indicates which reference signal (and thus which TRP/panel) should be used by relating to the time-frequency resource set where the scheduling signaling is received. This intermediary association allows the UE to correctly identify the appropriate beam and power control parameters without explicit indication, resolving the contradiction between serving multiple TRPs and maintaining transmission performance.
2Manufacturing precision
If explicit beam indication information is added to scheduling signaling, then the UE can accurately determine the correct beam and power control parameters for each TRP/panel, but this increases signaling overhead and system complexity
Solution Approach 1:
The patent applies universality by making the scheduling signaling serve multiple functions: it not only schedules uplink data transmission but also implicitly indicates the appropriate reference signal and TRP/panel through its association with time-frequency resource sets. This multi-functionality eliminates the need for separate explicit beam indication fields, maintaining accurate beam and power control parameter selection while avoiding additional signaling overhead and system complexity.
Solution Approach 2:
The patent implements self-service by enabling the scheduling signaling to automatically carry implicit beam indication information through its inherent association with time-frequency resource sets. The UE can autonomously determine the correct reference signal and corresponding transmission parameters by examining which time-frequency resource set the scheduling signaling occupies, without requiring additional network configuration or explicit indication messages, thus reducing overall system complexity.
Data Source
AI summary
The present disclosure provides a method and a device for UE and a base station in wireless communications. A UE receives a first signaling; and transmits a first radio signal. herein, the first signaling comprises scheduling information of the first radio signal; a first reference signal is used to determine at least one of transmitting power of the first radio signal or one or more antenna ports for transmitting the first radio signal; a first radio resource is associated with the first reference signal, and the first radio resource is related to the first signaling; the first signaling does not comprise a first field, the first field indicating one or more antenna ports for transmitting a radio signal scheduled by a signaling to which the first field belongs. The method ensures the reliability of uplink transmission for any TRP/panel when one UE is served by multiple TRPs/panels.