Terminal Index-Based Timing Advance for Multi-TRP Uplink
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Solution Overview
Problem
In future radio communication systems, controlling uplink transmission to multiple transmission/reception points (TRPs) is challenging, particularly in terms of timing advance, which can degrade communication quality if not appropriately managed.
Innovation Solution
A terminal equipped with a control section that determines a timing advance based on a specific index for uplink transmission to multiple TRPs, ensuring appropriate control of uplink transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uplink transmission is performed to multiple transmission/reception points simultaneously, then communication capacity and reliability are improved, but control complexity and timing synchronization difficulty increase
Solution Approach 1:
The patent segments the uplink transmission control by introducing a specific index (such as SRI or TCI state) that corresponds to different transmission/reception points. This allows the terminal to independently control timing advance for each TRP through separate index values, thereby managing the complexity of multi-TRP transmission while maintaining high communication capacity.
Solution Approach 2:
The patent applies local quality by allowing different timing advance values to be associated with different indices for different TRPs. Each TRP can have its own optimized timing advance parameter, enabling precise local control of uplink transmission timing for each reception point while maintaining overall system coordination.
2Measurement precision
If multiple timing advances are maintained for different TRPs, then uplink transmission precision to each TRP is improved, but terminal processing complexity and judgment difficulty increase
Solution Approach 1:
The patent introduces an intermediary index (such as SRI or TCI state) that mediates between the terminal and multiple timing advance values. The terminal does not directly manage multiple timing advances but instead selects the appropriate timing advance through the intermediary index, which simplifies the judgment process while maintaining precise timing control for each TRP.
Solution Approach 2:
The patent applies preliminary action by pre-configuring the association between indices and timing advance values through higher-layer signaling before actual uplink transmission. This pre-establishment of timing relationships eliminates the need for real-time complex judgments during transmission, as the terminal can directly apply the pre-determined timing advance corresponding to the selected index.
3Ease of operation
If timing advance control is simplified for ease of operation, then terminal operation complexity is reduced, but communication quality and synchronization accuracy may deteriorate
Solution Approach 1:
The patent applies universality by using a unified index mechanism (such as SRI or TCI state) that serves multiple functions: it identifies the target TRP, selects the appropriate timing advance value, and maintains synchronization information. This single index-based approach simplifies terminal operation while ensuring accurate timing control and high communication quality through its multi-functional capability.
Data Source
AI summary
A terminal according to one aspect of the present disclosure includes a control section that judges, based on a specific index, a timing advance to be applied to certain uplink transmission, from among a plurality of timing advances, and a transmitting section that performs the uplink transmission, based on the timing advance. According to one aspect of the present disclosure, it is possible to appropriately control UL transmission using more than four antenna ports.