Uplink Timing Advance Management in Multi-TRP Systems
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Solution Overview
Problem
Current telecommunications systems face challenges in managing timing advance operations for multiple uplink transmissions, particularly in multi-Transmission Reception Point (mTRP) scenarios, where maintaining accurate timing advance groups and transitioning between different physical cell indicators and timing advance groups is complex, leading to potential collisions and misalignments.
Innovation Solution
The system performs multiple uplink transmissions with different timing advances, allowing for switching between identifiers associated with distinct timing advance groups, and configures or drops transmissions based on available timing advances, using instructions from network nodes to manage these transitions and ensure proper alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple uplink transmissions are performed with different timing advances in multi-TRP scenarios, then the adaptability and versatility of the system is improved, but the device complexity and difficulty of managing timing advance groups increases
Solution Approach 1:
The system segments timing advance management by associating different timing advance values with different identifiers (TAGs). Each identifier maintains its own timing advance value, allowing independent management of multiple uplink transmissions to different TRPs. This segmentation resolves the complexity by organizing timing advance groups into manageable, identifier-specific units rather than managing all transmissions as a single complex group.
Solution Approach 2:
The system performs preliminary configuration of timing advance values and identifier associations before actual uplink transmissions occur. By pre-establishing the mapping between identifiers and timing advance groups, and pre-configuring multiple timing advance values, the system eliminates the need for complex real-time calculations and adjustments during transmission, thereby reducing operational complexity while maintaining versatility.
2Adaptability or versatility
If instructions are received to switch identifiers during transmission, then the adaptability of the system is improved, but the reliability may deteriorate due to potential collisions and misalignments
Solution Approach 1:
The system prepares for potential collisions and misalignments by establishing clear rules and procedures for identifier switching before they occur. The network node provides instructions that pre-defin e the timing and conditions for switching between identifiers and their associated timing advance groups. This beforehand preparation cushions against reliability issues by ensuring that transitions are controlled and coordinated, preventing collisions and misalignments rather than reacting to them after they occur.
Solution Approach 2:
The system employs feedback mechanisms where the network node monitors the status of uplink transmissions and provides instructions for identifier switching based on observed conditions. The network receives feedback about transmission status and timing alignment, then sends control instructions to switch identifiers appropriately. This closed-loop feedback ensures that identifier switching occurs at optimal moments, maintaining reliability while enabling adaptability.
3Productivity
If the third uplink transmission is configured with available timing advance, then the productivity is improved, but if not available, the transmission must be dropped or reconfigured, increasing loss of time
Solution Approach 1:
The system performs preliminary configuration of multiple timing advance values and their associated identifiers before uplink transmissions are needed. By pre-establishing the mapping between identifiers and timing advance groups, and ensuring multiple timing advance values are ready in advance, the system can immediately configure the third uplink transmission with an available timing advance when instructed to switch identifiers. This eliminates delays and prevents the need to drop transmissions, thereby maintaining high productivity without time loss.
Data Source
AI summary
According to various, but not necessarily all, examples there is provided an apparatus performing a first uplink transmission with a first timing advance and a second uplink transmission with a second timing advance. The first uplink transmission is associated with a first identifier and the second uplink transmission is associated with a second identifier. The apparatus further receives instructions for switching the second identifier to a third identifier, wherein the third identifier is associated with a third uplink transmission. The apparatus further performs at least one of: configuring the third uplink transmission to be associated with the second timing advance or an updated second timing advance or a third timing advance, or dropping the third uplink transmission.