CJT CSI Reporting Segmentation for TRP Selection
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in efficiently managing control information for coherent joint transmission (CJT) across multiple transmission reception points (TRPs).
Innovation Solution
The proposed solution involves transmitting and receiving control information using a method that includes a first CSI part with a fixed payload size and a second CSI part with a variable payload size, where both parts indicate one or more TRPs. This allows for efficient TRP selection and precoder indication, enabling CJT.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single CSI report with fixed payload size is used for TRP indication, then the control information structure is simple, but the ability to indicate multiple TRPs and provide variable payload information is limited
Solution Approach 1:
The CSI report is divided into two separate parts: CSI part 1 with fixed payload size for basic TRP indication, and CSI part 2 with variable payload size for additional TRP information. This segmentation allows the system to indicate multiple TRPs while maintaining a simple fixed-structure component and adding complexity only when needed.
Solution Approach 2:
The CSI report structure transitions from a purely fixed format to a dynamic hybrid format where part 1 has fixed size and part 2 has variable size. The variable payload in part 2 is activated based on the TRP indication needs, allowing the system to adapt the report structure to the specific communication scenario.
2Loss of information
If CSI part 2 with variable payload size is added, then more TRP information can be indicated, but the control information processing complexity increases
Solution Approach 1:
CSI part 1 is transmitted first with fixed payload size containing essential TRP indication information. CSI part 2 with variable payload is prepared and transmitted subsequently only when additional TRP information is needed, as determined by the preliminary information in part 1. This preliminary action reduces unnecessary processing when full TRP information is not required.
Solution Approach 2:
CSI part 1 acts as an intermediary that provides basic TRP indication and determines whether CSI part 2 is needed. This intermediate structure mediates between the simple fixed-format requirement and the comprehensive variable-format requirement, enabling efficient processing by filtering out cases where full variable payload processing is unnecessary.
3Reliability
If multiple TRPs are indicated in CSI, then coherent joint transmission performance is improved, but the payload size and processing overhead increase
Solution Approach 1:
The TRP indication information is segmented across two parts: essential TRP identification in CSI part 1 with fixed size, and additional TRP details in CSI part 2 with variable size. This segmentation allows multiple TRPs to be indicated reliably while controlling the total payload size by only adding variable information when necessary.
Solution Approach 2:
The system changes the payload size parameter of CSI part 2 dynamically based on the number of TRPs to be indicated. When only one TRP is indicated, the payload remains minimal; when multiple TRPs are indicated, the variable payload expands to accommodate the additional information, thus optimizing the balance between reliability and payload size.
Data Source
AI summary
The apparatus may be configured to transmit (or receive) CSI including a first CSI part (CSI part 1) having a fixed payload size and a second CSI part (CSI part 2) having a variable payload size indicated in the CSI part 1, at least one of the CSI part 1 or the CSI part 2 indicating one or more TRPs and to transmit (or receive) data in a CJT using the one or more TRPs indicated in the at least one of the CSI part 1 or the CSI part 2.