TCI State Mapping for Timely Multi-TRP PDSCH Reception
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently determining the Transmission Configuration Indication (TCI) state, particularly in multi-TRP systems, leading to issues with PDSCH reception due to insufficient time for decoding control information and setting appropriate receive parameters.
Innovation Solution
A method and apparatus for determining TCI states in wireless communication systems, involving a UE and base station that utilize DCI and RRC signaling to identify associations and enable simultaneous reception, allowing for the determination of spatial filters for PDSCH reception based on coresetPoolIndex and indicators, thereby configuring default TCI states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the UE receives DCI indicating a TCI state in a CORESET, then the TCI state can be indicated for PDSCH reception, but insufficient time remains for decoding control information and setting appropriate receive parameters
Solution Approach 1:
The patent applies preliminary action by configuring default TCI states through RRC signaling in advance, before the DCI is received. The UE is pre-configured with multiple TCI states and their associations with coresetPoolIndex values, so when DCI indicates a TCI state, the UE can immediately apply the pre-configured spatial filter without needing time to decode or set parameters dynamically. This resolves the time constraint by performing the configuration work beforehand.
2Reliability
If multiple TCI states are configured for multi-TRP systems, then beam diversity and reception reliability are improved, but the complexity of determining the appropriate TCI state increases
Solution Approach 1:
The patent introduces coresetPoolIndex as an intermediary that simplifies the mapping between DCI and TCI states. Instead of directly managing complex multi-TRP TCI state selections, the system uses coresetPoolIndex values (0 or 1) associated with different CORESETs as intermediaries. The DCI format includes a TCI field that references pre-configured TCI states, and the UE determines the appropriate TCI state by combining the TCI field value with the coresetPoolIndex association. This intermediary mechanism reduces the determination complexity while maintaining support for multiple TCI states and beam diversity.
3Ease of operation
If the UE determines spatial filters based on TCI state associations, then proper beam management is achieved, but the processing overhead and determination time increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring the associations between TCI states, coresetPoolIndex values, and spatial filters through RRC signaling. The UE receives and stores multiple TCI state configurations along with their corresponding coresetPoolIndex associations in advance. When receiving DCI, the UE simply needs to look up the pre-configured association based on the TCI field value and coresetPoolIndex, rather than performing complex spatial filter determination in real-time. This significantly reduces the processing time and overhead while maintaining proper beam management capability.
Data Source
AI summary
Methods and apparatuses for determination of a transmission configuration indication (TCI) state in a wireless communication system. A method for operating a user equipment (UE) includes receiving, in a first control resource set (CORESET), a downlink control information (DCI) indicating a first TCI state and receiving, in a radio resource control (RRC) signaling, (i) a first indicator configuring a value of coresetPoolIndex associated with the first CORESET and (ii) a second indicator. The method further includes identifying, based on the first indicator, an association between the value of coresetPoolIndex and the first TCI state; identifying, based on the second indicator, whether a simultaneous reception before an indicated TCI state is applicable is enabled; and determining, based on the identifications, one or more spatial filters for receiving a physical downlink shared channel (PDSCH) before the indicated TCI state is applicable, wherein the PDSCH is associated with the value of coresetPoolIndex.