MsgA PUSCH Collision Handling in 2-Step RACH
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Solution Overview
Problem
In wireless communications, particularly in the context of 5G and new radio (NR) systems, there is a challenge in handling collisions between MsgA Physical Uplink Shared Channel (PUSCH) signals and other uplink channels, such as configured grant PUSCH transmissions, during the random access channel (RACH) process.
Innovation Solution
The proposed solution involves determining when a MsgA PUSCH signal collides with a configured grant PUSCH transmission, and in such cases, dropping one of the transmissions to avoid overlap. This decision is based on predefined rules that prioritize the MsgA PUSCH signal over the configured grant PUSCH signal, ensuring that the RACH process can proceed without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MsgA PUSCH signal is transmitted to ensure RACH process continuity, then RACH reliability is improved, but collision with configured grant PUSCH occurs causing transmission interference
Solution Approach 1:
The UE performs preliminary detection to identify potential collisions between MsgA PUSCH and configured grant PUSCH transmissions before actually transmitting. When a collision is detected, the UE proactively drops the configured grant PUSCH transmission in advance, preventing the harmful interference from occurring. This preliminary action ensures RACH process reliability while avoiding transmission collisions.
2Productivity
If configured grant PUSCH transmission is maintained for regular data communication, then communication efficiency is improved, but collision with MsgA PUSCH causes RACH process disruption
Solution Approach 1:
The UE detects potential collisions between configured grant PUSCH and MsgA PUSCH signals in advance. When a collision is identified, the UE preemptively drops the configured grant PUSCH transmission, preventing disruption to the RACH process. This approach maintains high communication efficiency by allowing configured grant PUSCH to operate normally during non-collision periods while ensuring RACH reliability through collision avoidance.
3Adaptability or versatility
If transmission resources are allocated for both MsgA PUSCH and configured grant PUSCH simultaneously, then resource utilization is improved, but transmission overlap occurs causing signal interference
Solution Approach 1:
The UE performs preliminary detection to identify when MsgA PUSCH and configured grant PUSCH transmissions would overlap in time. Upon detecting such overlap, the UE drops the configured grant PUSCH transmission in advance, preventing signal interference. This approach maintains high resource utilization by allowing both transmission types to operate independently when no collision is detected, while eliminating harmful interference through proactive collision avoidance.
Data Source
AI summary
A method and device are disclosed for performing collision resolution in a two-step random access channel (RACH) process. In such a process, an MsgA PUSCH signal and a grant based PUSCH signal may collide. When such a collision is detected, either the MsgA PUSCH signal or the grant based PUSCh signal are dropped. The other of the two signals is then transmitted. The determination regarding which signal to drop can be based on a set of rules stored in memory.