RACH Occasion Masking to Avoid IIoT Transmission Conflicts
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communications systems, random access messages from user equipment (UE) often collide with scheduled transmissions by other UEs or base stations, leading to interference and reduced communication efficiency and reliability.
Innovation Solution
Implementing a forbidden mask and dynamic slot availability indication to prevent RACH transmissions from occurring during slots reserved for scheduled IIoT transmissions, such as semi-persistent scheduling (SPS) and configured grant (CG) transmissions, by identifying allowed random access occasions based on the forbidden mask and dynamic indications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If RACH transmissions are allowed in all slots, then random access availability is improved, but interference with scheduled IIoT transmissions occurs
Solution Approach 1:
The time domain resources are segmented into allowed RACH occasions and forbidden RACH occasions based on the RACH occasion mask. This segmentation allows the system to permit RACH transmissions in some slots while prohibiting them in slots where scheduled IIoT transmissions occur, thereby resolving the contradiction between RACH availability and interference avoidance
Solution Approach 2:
The RACH occasion mask is configured dynamically to adapt to different traffic conditions and scheduling patterns. The mask can be updated to reflect changes in scheduled transmission patterns, allowing the system to optimize the balance between RACH availability and interference avoidance based on current system conditions
2Reliability
If RACH transmissions are restricted to avoid interference, then communication reliability is improved, but RACH access efficiency deteriorates
Solution Approach 1:
The system performs preliminary action by configuring the RACH occasion mask in advance, before RACH transmissions occur. This allows UEs to identify allowed and forbidden RACH occasions beforehand, ensuring that RACH transmissions only occur in slots without scheduled IIoT transmissions, thereby maintaining both reliability and efficiency
Solution Approach 2:
The RACH occasion mask configuration provides feedback information to UEs about which slots are suitable for RACH transmissions. This feedback mechanism enables UEs to adapt their RACH access behavior to avoid interference with scheduled transmissions while maintaining efficient access to the random access channel
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Interference between random access channel (RACH) transmissions and Industrial Internet of Things (IIoT) transmissions may be avoided with a RACH occasion forbidden mask and a dynamic indication of availability of downlink retransmission resources. A user equipment (UE) may receive an indication of a RACH configuration and a forbidden mask associated with the RACH configuration. The UE may identify, from a set of random access occasions indicated by the RACH configuration, a subset of allowed random access occasions based on the forbidden mask. The UE may transmit a random access message during at least one allowed random access occasion of the subset. Additionally or alternatively, a base station may determine whether one or more transmissions on a component carrier (CC) were successful, and transmit downlink control information (DCI) indicating whether a set of random access occasions are available on the CC.