TCI State Indication in DCI 1_2 Under Limited Codepoints
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently indicating transmission configuration indicator (TCI) states due to limitations in the number of codepoints in downlink control information (DCI) format 1_2, which can lead to inefficiencies and increased power consumption and network overhead.
Innovation Solution
The system employs a method where a first quantity of codepoints in DCI format 1_2 is used to indicate a subset of activated TCI states, allowing the UE or base station to apply a TCI state from this subset, even when the number of codepoints is smaller than the total activated TCI states, thereby optimizing resource allocation and reducing unnecessary transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of codepoints in DCI format 1_2 is increased to indicate all activated TCI states, then the completeness of TCI state indication is improved, but the size of DCI message and network overhead increase
Solution Approach 1:
The patent segments the TCI state indication process into two parts: (1) A subset of TCI states is indicated through DCI format 1_2 using a first quantity of codepoints, and (2) The remaining activated TCI states are indicated through separate signaling. This segmentation allows the DCI message to remain compact while still enabling complete TCI state indication through the combination of both signaling methods
Solution Approach 2:
The patent introduces an additional dimension for TCI state indication by using a second quantity of codepoints in a different DCI format or through separate signaling mechanisms. This multi-dimensional approach allows the system to indicate a larger number of TCI states without increasing the size of the primary DCI format 1_2 message
2Measurement precision
If the number of codepoints in DCI format 1_2 is increased to indicate all activated TCI states, then the accuracy of TCI state selection is improved, but the power consumption increases
Solution Approach 1:
By segmenting the TCI state indication into multiple signaling stages, the patent enables accurate TCI state selection without requiring a large number of codepoints in a single DCI message. The UE processes TCI states in steps, reducing the computational burden and power consumption associated with decoding and processing a large DCI message with many codepoints
3Quantity of substance
If a subset of TCI states is indicated using fewer codepoints, then the network overhead is reduced, but the complexity of TCI state mapping increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring the mapping relationship between codepoints and TCI states through higher-layer signaling before DCI transmission. This pre-configuration establishes a known mapping pattern that simplifies the UE's decoding process, reducing the complexity of TCI state mapping despite using a subset of states with fewer codepoints
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a base station, downlink control information (DCI) in format 1_2 that includes an indicator with a first quantity of codepoints that is smaller than a second quantity of activated transmission configuration indicator (TCI) states. Accordingly, the UE may apply a TCI state, from the first quantity of activated TCI states out of the second quantity of activated TCI states, according to the indicator. Numerous other aspects are described.