UE Timing Conflict Resolution in 5G NR Random Access
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Solution Overview
Problem
In wireless communication networks, particularly in 5G NR, there are no suitable mechanisms to resolve timing conflicts during contention-based two-step random-access channel (RACH) procedures, leading to potential network efficiency degradation and failure in transmitting intended messages or signals.
Innovation Solution
A user equipment (UE) determines transmission precedence between a random-access procedure message and other signals, modifying transmission timing by either shifting, aborting, or delaying transmissions based on signal types, priority levels, and channel quality to resolve timing conflicts and maintain network efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the base station grants the UE a PUSCH occasion for uplink transmission that overlaps with the MsgA transmission time, then the UE can transmit uplink data, but the UE cannot transmit both the uplink data and the random-access procedure message simultaneously
Solution Approach 1:
The patent implements dynamic timing adjustment by allowing the UE to flexibly modify the transmission timing of either the random-access procedure message or the uplink data signal based on real-time conflict detection. The UE dynamically selects which signal to transmit at the original timing and which to delay or abort, optimizing resource utilization while maintaining reliable communication.
Solution Approach 2:
The patent applies preliminary action by having the UE detect potential timing conflicts between random-access procedure messages and other uplink signals before transmission occurs. The UE proactively determines transmission precedence and modifies timing in advance, preventing transmission failures rather than recovering from them.
2Adaptability or versatility
If the base station configures the UE to transmit other signals (SRS, CQI, CSI, SR) at scheduled times that overlap with MsgA transmission, then the UE can provide channel quality information and other uplink functions, but the UE cannot transmit multiple signals at the same time
Solution Approach 1:
The patent implements preliminary action by having the UE detect timing conflicts between random-access procedure messages and other configured uplink signals (SRS, CQI, CSI, SR) before transmission. The UE proactively determines which signal to prioritize and modifies timing in advance, ensuring critical random-access communications are not delayed while maintaining other uplink functions.
3Reliability
If the UE transmits the random-access procedure message at the original timing, then the random-access procedure can complete successfully, but the other signal transmission is delayed or aborted
Solution Approach 1:
The patent applies local quality by making differentiated decisions about which specific signal to prioritize based on the type of conflicting signal. The UE evaluates the importance and characteristics of each conflicting signal (uplink data, SRS, CQI, CSI, SR) and applies different precedence rules, ensuring that critical signals maintain their transmission timing while less critical signals are delayed or aborted.
Data Source
Figure 1
Figure 2A~2B
Figure 2C
AI summary
A method for handling timing conflicts associated with a random channel access procedure is implemented in a user device, and includes determining (314) that a first time span for the user device to transmit at least a data portion of a random-access procedure message to a base station overlaps a second time span for the user device to transmit another signal to the base station. The method also includes determining (320), based at least on a type of the other signal, a transmission precedence indicative of whether to modify transmission timing for the random-access procedure message or to instead modify transmission timing for the other signal, and, based on the determined transmission precedence, either transmitting (340) at least the data portion of the random-access procedure message to the base station during the first time span or transmitting (340) the other signal to the base station during the second time span.