Uplink Signaling for Multi-TRP Communications
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently signaling configuration and control information for uplink communications to multiple transmission-reception points (TRPs), leading to inadequate information for flexible and reliable transmissions.
Innovation Solution
The implementation of rank and resource set signaling techniques, where user equipment (UE) receives configuration information to determine the appropriate SRS resource sets for uplink communications, allowing for flexible indication of transmission parameters using reduced overhead, enabling efficient communication with multiple TRPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional signaling methods are used for uplink communications to multiple TRPs, then the system maintains simplicity in control information structure, but the reliability and flexibility of transmissions are insufficient
Solution Approach 1:
The control information is segmented into separate fields: a first field indicating a first SRS resource set for a first TRP and a second field indicating a second SRS resource set for a second TRP. This segmentation allows independent configuration and indication of resource sets for different TRPs, enhancing transmission reliability through diverse resource allocation while maintaining structured organization that manages complexity.
Solution Approach 2:
The patent introduces an additional dimension to the control information structure by adding a second SRS resource set indication field alongside the first. This dimensional expansion enables simultaneous indication of multiple resource sets for different TRPs, providing the flexibility and reliability needed for multi-TRP communications without overwhelming system complexity.
2Adaptability or versatility
If separate indication fields are added for each TRP's SRS resource set, then the flexibility and reliability of multi-TRP communications are improved, but the control information overhead increases
Solution Approach 1:
The control information structure is designed with universal fields that can indicate SRS resource sets for different TRPs. The first and second fields serve multiple purposes: they can independently indicate resource sets for different TRPs, or collectively support various transmission scenarios including single-TRP and multi-TRP communications, thereby providing transmission flexibility without proportionally increasing overhead.
Solution Approach 2:
The patent implements dynamic indication where the control information fields can adaptively represent different SRS resource set configurations based on transmission requirements. This dynamic structure allows the system to flexibly allocate resources across multiple TRPs while maintaining efficient use of control information bits through conditional and context-dependent field interpretations.
3Adaptability or versatility
If comprehensive configuration information is provided for all possible SRS resource combinations, then the adaptability for different TRP configurations is improved, but the signaling overhead and processing complexity increase
Solution Approach 1:
The configuration information is segmented into distinct fields for different SRS resource sets, each field managing a specific TRP's resource configuration independently. This segmentation reduces processing complexity by allowing separate handling and interpretation of each field, while maintaining high adaptability through the ability to configure multiple resource sets for different TRP scenarios.
Solution Approach 2:
The patent employs preliminary configuration where SRS resource sets are pre-configured and identified before transmission. The control information fields indicate these pre-configured resource sets, allowing the system to adapt to different TRP configurations without requiring comprehensive real-time signaling for all possible combinations, thereby reducing processing complexity while maintaining adaptability.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described in which a user equipment (UE) may transmit one or more uplink communications to multiple transmission-reception points (TRPs). Transmission parameters for each repetition may be based on parameters (e.g., a number of antenna ports, a spatial domain filter or beam, a rank or number of layers, or any combinations thereof) that are determined from an indication of whether the repetitions are to use different sounding reference signal (SRS) resource sets, and indicated SRS resource of each SRS resource set. The indication may include a same number of bits regardless of whether one SRS resource set is used or multiple SRS resource sets are used, and may be based on a prior configuration of the UE.