Uplink TAG Collision Handling for Multi-Panel Wireless Transmission
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Solution Overview
Problem
In wireless communication systems, when multiple timing advance groups (TAGs) are managed, uplink signals based on different TAs may collide, leading to ambiguity in handling these collisions.
Innovation Solution
A method for configuring and transmitting uplink signals based on different timing advance groups (TAGs) using rules such as transmission start times, scheduling times, minimum processing times, and total transmission power to resolve collisions and ensure effective signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two TAGs are configured to support TRP-specific TA, then timing difference between TRPs is compensated, but uplink signals based on different TAs may collide
Solution Approach 1:
The patent segments uplink signals into different types (first uplink signal related to first TAG, second uplink signal related to second TAG) and applies different handling rules to each segment. When collision is detected, the UE transmits only the first uplink signal based on first TA, while dropping the second uplink signal, thereby preventing harmful interference between segmented signal groups
Solution Approach 2:
The patent applies different quality characteristics to different signal segments by associating each TAG with specific TCI states and signal types. The first TAG is linked to first TCI state and first uplink signal, while the second TAG is linked to second TCI state and second uplink signal, allowing localized optimization of transmission parameters for each signal segment
2Loss of time
If multiple TAGs are managed for M-DCI based M-TRP operation, then propagation delay difference is compensated, but ambiguity arises in handling colliding UL signals
Solution Approach 1:
The patent establishes preliminary handling rules for uplink signal collision before the collision actually occurs. The UE is pre-configured with the rule that when a first uplink signal and second uplink signal collide, only the first uplink signal shall be transmitted. This preliminary action eliminates handling ambiguity by providing predetermined instructions for collision scenarios
Solution Approach 2:
The patent implements a feedback mechanism where the UE monitors for collision between uplink signals scheduled for different TAGs and applies predetermined handling rules based on the collision detection. The system provides feedback on which signal to transmit or drop, resolving the ambiguity through structured decision-making based on signal type and TAG association
Data Source
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AI summary
A method performed by a user equipment (UE) ccording to an embodiment of the present disclosure includes receiving configuration information and transmitting a first uplink signal related to a first TAG and/or a second uplink signal related to a second TAG. Based on the first uplink signal and the second uplink signal being overlapped, the first uplink signal and/or the second uplink signal are transmitted based on a rule. The rule is related to a Simultaneous Transmission across Multiple Panels (STxMP).