PRACH Occasion Subset Selection for Multiple Random Access Transmissions
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing multiple physical random access channel (PRACH) transmissions, particularly in selecting optimal RACH occasions for improved communication efficiency and reduced interference.
Innovation Solution
A user equipment (UE) and network node are configured to select and monitor a subset of candidate RACH occasions for PRACH transmissions, allowing for more efficient transmission and reception of multiple PRACH transmissions, optimizing the random access procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network node monitors all RACH occasions for multiple PRACH transmissions, then the UE can transmit PRACH transmissions with better coverage and reliability, but the network node's blind decoding complexity and processing load increase significantly
Solution Approach 1:
The patent divides the total set of RACH occasions into a subset that the network node actually monitors. Instead of monitoring all possible RACH occasions, the network node selectively monitors only those RACH occasions that are relevant for the UE's multiple PRACH transmissions. This segmentation reduces the network node's blind decoding complexity while ensuring that the monitored subset is sufficient to capture the PRACH transmissions with adequate reliability.
Solution Approach 2:
The patent applies local quality by configuring the network node to monitor specific RACH occasions with different monitoring characteristics based on local conditions. The network node can adjust the monitoring subset according to the UE's location, channel conditions, and transmission requirements, optimizing the balance between reliability and complexity for each specific scenario rather than applying a uniform monitoring approach.
2Reliability
If the UE transmits multiple PRACH transmissions in different RACH occasions, then the probability of successful random access increases, but the interference between transmissions and resource utilization efficiency deteriorate
Solution Approach 1:
The patent employs preliminary action by pre-configuring the UE with a specific subset of RACH occasions to use for multiple PRACH transmissions. The network node provides the UE with information about which RACH occasions are available and appropriate for transmission. This preliminary configuration allows the UE to select RACH occasions that are less likely to cause interference, as the network has already considered resource allocation and potential conflicts before the actual transmissions occur.
Solution Approach 2:
The patent applies dynamics by allowing the subset of RACH occasions to be dynamically adjusted based on network conditions, UE behavior, and interference levels. The network node can reconfigure the RACH occasion subset for different UEs or even for the same UE at different times, adapting to changing conditions to minimize interference while maintaining successful access probability.
3Use of energy by moving object
If the network node monitors a subset of candidate RACH occasions instead of all RACH occasions, then the processing load and power consumption are reduced, but the risk of missing PRACH transmissions increases
Solution Approach 1:
The patent uses preliminary action by pre-configuring the network node with knowledge of which RACH occasions the UE will use for multiple PRACH transmissions. The network node receives information from the UE (such as RACH occasion indices or patterns) before the actual transmissions, allowing it to prepare the appropriate monitoring subset in advance. This ensures that the network node monitors exactly the right occasions with high reliability while avoiding unnecessary monitoring of other occasions that would waste energy.
Solution Approach 2:
The patent applies self-service by enabling the UE to indicate or determine its own RACH occasion selections and provide this information to the network node. The UE essentially serves the network node by providing the monitoring configuration information, allowing the network node to efficiently configure its monitoring subset based on the UE's actual transmission plans rather than requiring the network node to blindly monitor all possibilities.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may select, from a subset of candidate random access channel (RACH) occasions, a RACH occasion for transmitting a first physical RACH (PRACH) transmission of multiple PRACH transmissions in a random access procedure, wherein the subset of candidate RACH occasions is part of a total set of RACH occasions. The UE may transmit, to a network node, the first PRACH transmission of the multiple PRACH transmissions in the RACH occasion selected from the subset of candidate RACH occasions. Numerous other aspects are described.