Terminal TCI State Field Size Determination
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Solution Overview
Problem
Current radio communication systems, such as those for NR, face challenges in appropriately determining the Transmission Configuration Indication (TCI) state, which is crucial for controlling transmission and reception processing. The method of indicating a TCI state applicable to multiple types of signals is unclear, leading to potential degradation in communication quality and throughput reduction.
Innovation Solution
A terminal is equipped with a receiving section that receives a list of TCI states applicable to various signals and a configuration related to a field in downlink control information for indicating one or more TCI states. The control section determines the size of this field based on the received list, configuration, and capability information, allowing for appropriate recognition of the TCI state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a TCI state applicable to multiple types of signals is indicated by downlink control information, then communication quality can be improved, but the method of indication is unclear leading to throughput reduction
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the field size in downlink control information based on the number of TCI states and capability information. The field size is determined by logarithmic calculation (ceil(log2(number of TCI states))) to optimize the balance between indication capability and control overhead, thereby improving communication quality while maintaining throughput efficiency.
2Adaptability or versatility
If the field size for TCI state indication is increased to accommodate more TCI states, then more signals can be controlled, but the downlink control information size increases
Solution Approach 1:
The patent implements dynamics by making the field size adaptive rather than fixed. The field size dynamically adjusts according to the actual number of TCI states configured and the terminal's capability information. This allows the system to accommodate varying numbers of TCI states (from 1 to 8 or more) while minimizing the downlink control information size by using only the necessary number of bits for each scenario.
Solution Approach 2:
The patent changes the parameter of field size based on the relationship between the number of TCI states and capability information. By calculating the minimum required field size using logarithmic functions, the system optimizes the balance between adaptability (number of TCI states that can be indicated) and control overhead (downlink control information size), avoiding both under-provisioning and over-provisioning of the field.
3Ease of operation
If the method of indicating TCI state is not clear, then implementation flexibility is maintained, but communication quality degradation occurs
Solution Approach 1:
The patent applies preliminary action by pre-defining clear rules and criteria for determining the field size based on the number of TCI states and capability information. The terminal and base station both follow the predetermined method of calculating field size using logarithmic functions and comparing against capability information thresholds. This eliminates implementation ambiguity while maintaining flexibility through the structured decision-making process outlined in the patent.
Data Source
AI summary
A terminal according to an aspect of the present disclosure includes: a receiving section that receives a list indicating transmission configuration indication (TCI) states applicable to a plurality of types of signals and a configuration related to a field in downlink control information for indication of one or more TCI states in the list; and a control section that determines a size of the field on the basis of at least one of the list, the configuration, and capability information related to the indication. An aspect of the present disclosure allows a TCI state to be appropriately recognized.