DCI Field Interpretation for Dynamic Multi-Panel Uplink Switching
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Solution Overview
Problem
Existing wireless communication systems face challenges in interpreting downlink control information (DCI) fields in non-codebook-based multi-panel deployments with dynamic panel switching, particularly in managing uplink shared channel transmissions across multiple transmission and reception points (TRPs).
Innovation Solution
The described techniques provide a signaling-based mechanism for user equipment (UE) to dynamically switch between single and multi-TRP operations, utilizing a mapping between SRS resource sets and SRI fields in DCI to manage uplink shared channel transmissions, including configurations for maximum rank values and SRS resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a UE is configured to support both single-TRP and multi-TRP operations with dynamic panel switching, then the system flexibility and adaptability are improved, but the device complexity and difficulty of interpreting DCI fields increase
Solution Approach 1:
The patent implements dynamic panel switching by enabling the UE to switch between single-TRP and multi-TRP operation modes based on received indications. The DCI field interpretation is made dynamic through configuration parameters that allow the UE to adapt its interpretation rules based on the current operation mode, thereby resolving the contradiction between adaptability and complexity by making the system flexible rather than static
Solution Approach 2:
The patent changes the interpretation parameters of DCI fields based on the configured operation mode. When the UE is configured for single-TRP operation, it interprets SRI fields according to single-TRP rules; when configured for multi-TRP operation, it switches to multi-TRP interpretation rules. This parameter-based approach allows the same hardware to support multiple modes without permanent complexity increases
2Adaptability or versatility
If multiple SRS resource sets are configured for non-codebook usage with different maximum rank values, then the uplink transmission flexibility is improved, but the difficulty of detecting and measuring DCI field mappings increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple SRS resource sets with associated maximum rank values before uplink transmissions. The network entity provides RRC configurations that define the mapping relationships between SRI field codepoints and SRS resource sets in advance. This allows the UE to have the mapping information ready before receiving DCI, reducing the real-time detection complexity
Solution Approach 2:
The patent introduces maximum rank values as an intermediary parameter that mediates between the SRI field codepoints and the SRS resource sets. The maximum rank value serves as a lookup key that simplifies the mapping process: the UE uses the codepoint value from the SRI field to index into the pre-configured maximum rank values, which then directly identifies the corresponding SRS resource set, thereby simplifying the detection process
3Productivity
If the UE interprets DCI fields differently based on single-TRP or multi-TRP operation mode, then the communication efficiency is improved, but the loss of information increases due to potential misinterpretation
Solution Approach 1:
The patent implements feedback mechanisms where the network entity provides explicit indications of the operation mode through RRC configuration messages. The UE feeds back its capability support for single-TRP and multi-TRP operations, and the network entity responds with appropriate configuration parameters. This feedback loop ensures that both sides have consistent understanding of the current operation mode, preventing misinterpretation while maintaining high transmission efficiency
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. In some aspects, a user equipment (UE) and a network entity may support one or more configuration- or signaling-based mechanisms according to which the network entity may configure one or more maxRank values and according to which the UE may interpret one more downlink control information (DCI) fields to identify, ascertain, or otherwise determine information associated with a non-codebook (CB)-based uplink shared channel message. For example, the UE may support a first interpretation of DCI fields if a first quantity of maxRank values are indicated and may support a second interpretation of DCI fields if a second quantity of maxRank values are indicated.