Default Uplink TCI State Determination for 5G Latency Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication technologies, such as LTE and 5G, face challenges in efficiently configuring uplink transmissions without a signaled uplink transmission configuration indicator (TCI) state, leading to increased latency and reduced throughput due to the need for UE to wait for gNodeB configuration.
Innovation Solution
Implementing rule-based methods to determine a default uplink beam or path loss reference signal for uplink transmissions when no TCI state is indicated, allowing UEs to proceed with uplink transmissions without waiting for gNodeB configuration, thereby reducing latency and improving communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE waits for gNodeB configuration of uplink TCI state, then the transmission configuration is accurate and reliable, but the latency increases and throughput decreases
Solution Approach 1:
The patent applies preliminary action by configuring downlink TCI states in advance before uplink transmissions are needed. The UE can determine default uplink TCI states based on pre-configured downlink TCI states, spatial QCL assumptions, and CORESET configurations, allowing the UE to proceed with uplink transmissions without waiting for explicit gNodeB configuration, thus reducing latency while maintaining reliability through pre-established configuration rules
2Reliability
If the UE waits for gNodeB configuration of uplink TCI state, then the beam configuration is accurate, but the communication efficiency and throughput are reduced
Solution Approach 1:
The patent implements self-service by enabling the UE to autonomously determine default uplink TCI states using pre-configured downlink TCI states and spatial QCL assumptions. The UE applies rules based on the most recent downlink TCI state or CORESET configuration to select appropriate uplink beams without requiring explicit gNodeB configuration, thereby improving communication efficiency and throughput while maintaining beam configuration accuracy through standardized selection criteria
3Productivity
If the UE proceeds with uplink transmission without waiting for gNodeB configuration, then the latency is reduced and throughput is improved, but the system complexity increases due to rule-based determination
Solution Approach 1:
The patent applies parameter changes by utilizing existing downlink TCI state parameters and spatial QCL assumptions to determine uplink TCI states. The UE transforms downlink configuration parameters into uplink transmission parameters through established mapping rules, avoiding the need for complex new configuration mechanisms while enabling autonomous operation and improving throughput
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for determining default parameters to use in the absence of a signaled uplink transmission configuration indicator (TCI) state for uplink transmissions. In some cases, a UE may determine, based on one or more rules, at least one of a default uplink beam or default path loss reference signal (PL RS) to use an uplink transmission in the absence of a signaled uplink transmission configuration indicator (TCI) state for the uplink transmission; and send the uplink transmission in accordance with the determination.