PUSCH Transmission in PRACH Gap for NB-IoT Collision Avoidance
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Solution Overview
Problem
In wireless communication systems, particularly in NB-IoT, there is a challenge in efficiently transmitting and receiving wireless signals due to collisions between physical uplink shared channels (PUSCH) and physical random access channels (PRACH) during repeated transmissions, leading to dropped or delayed signals.
Innovation Solution
The method involves allowing the physical uplink shared channel (PUSCH) to be transmitted within the PRACH transmission gap, with options to either drop or delay the starting part of the PUSCH transmission, or adjust the transmission timing to avoid collisions, depending on the NPRACH transmission mode, ensuring efficient signal transmission without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If PUSCH is repeatedly transmitted in PRACH transmission gap, then uplink data transmission continuity is improved, but signal collisions occur causing dropped or delayed transmissions
Solution Approach 1:
The patent applies preliminary action by detecting the NPRACH transmission mode in advance and determining whether PUSCH transmission should be performed in the NPRACH transmission gap before collision occurs. The UE checks whether the NPRACH transmission mode is first type or second type, and based on this preliminary determination, either transmits or skips PUSCH in the gap, thereby avoiding signal collisions before they happen.
Solution Approach 2:
The patent applies dynamics by making the PUSCH transmission behavior adaptive based on the detected NPRACH transmission mode. The system dynamically adjusts whether to transmit PUSCH in the NPRACH transmission gap according to the identified transmission mode (first type or second type), allowing flexible optimization of both transmission continuity and collision avoidance.
2Productivity
If PUSCH transmission is allowed in NPRACH transmission gap, then resource utilization is improved, but interference with NPRACH occurs
Solution Approach 1:
The patent applies preliminary action by identifying the NPRACH transmission mode before PUSCH transmission. The UE performs mode detection in advance and uses this information to determine whether allowing PUSCH in the gap would cause interference, thereby preventing harmful interference before it occurs while still enabling resource utilization when safe.
Solution Approach 2:
The patent uses the NPRACH transmission mode identification as an intermediary condition that mediates between PUSCH transmission desires and NPRACH protection requirements. Based on the mode type (first or second), the system decides whether PUSCH can be transmitted in the gap, acting as a conditional gateway that allows resource utilization only when it won't harm NPRACH.
Data Source
AI summary
The present invention relates to a wireless communication system and, in particular, to a method and an apparatus therefor, the method comprising the steps of: receiving uplink scheduling information from a base station; and repeatedly transmitting a PUSCH according to the uplink scheduling information, wherein, when repeated transmission of the PUSCH is performed in a PRACH transmission gap, the repeated transmission of the PUSCH in the PRACH transmission gap is at least partially dropped or delayed.