PRACH Occasion Reselection Under Dynamic RACH Adaptation
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing random access channel (RACH) occasions (ROs) due to dynamic activation and deactivation, leading to potential issues like redundant transmissions and increased power consumption, especially in complex and dynamic environments.
Innovation Solution
Implement mechanisms for regulating the selection and re-selection of ROs through network signaling, using thresholds based on reference signal received power (RSRP) to encourage or discourage UE usage of additional ROs, ensuring reliable communication and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic activation and deactivation of RACH occasions is implemented, then adaptability to changing communication conditions is improved, but redundant transmissions and power consumption increase
Solution Approach 1:
The patent implements feedback mechanisms where the network entity provides indication information to the UE about the activation status of RACH occasions. The UE uses this feedback to determine whether to attempt transmission in a given RO, avoiding redundant transmissions in deactivated ROs and thus reducing power consumption while maintaining adaptability to changing conditions.
Solution Approach 2:
The network entity performs preliminary action by providing advance indication information about which RACH occasions are activated and which are deactivated. This allows the UE to prepare its transmission strategy in advance, selecting only active ROs for transmission attempts, thereby avoiding unnecessary power consumption in deactivated ROs while preserving the system's ability to adapt dynamically.
2Adaptability or versatility
If dynamic activation and deactivation of RACH occasions is implemented, then adaptability to changing communication conditions is improved, but redundant transmissions occur
Solution Approach 1:
The feedback mechanism provides the UE with accurate information about the activation status of RACH occasions. This enables the UE to select only active ROs for transmission attempts, eliminating redundant transmissions in deactivated ROs and improving overall transmission efficiency while maintaining the system's adaptability to changing communication conditions.
Solution Approach 2:
The network entity performs preliminary identification and communication of active versus deactivated RACH occasions to the UE. This preliminary action allows the UE to optimize its transmission strategy by focusing only on active ROs, thereby reducing redundant transmissions and improving productivity without sacrificing adaptability.
3Reliability
If RACH occasion selection rules are implemented, then transmission reliability is improved, but device complexity increases
Solution Approach 1:
The patent uses feedback in the form of indication information provided by the network entity to guide the UE's RACH occasion selection. This feedback-based approach improves transmission reliability by ensuring the UE only attempts transmissions in active ROs, while the complexity is managed through standardized feedback protocols rather than complex autonomous decision-making algorithms.
Solution Approach 2:
The patent manages complexity by changing parameters such as the activation status of RACH occasions rather than implementing complex selection algorithms. The UE simply needs to follow the activation status indicators provided by the network, which simplifies the UE's processing requirements while maintaining high transmission reliability through parameter-based control.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for selection and reselection of random access channel (RACH) occasions (ROs) under physical RACH (PRACH) adaptation. An example method, performed at a user equipment (UE), generally includes receiving signaling indicating adaptation of a first set of one or more random access channel (RACH) occasions (ROs), wherein the adaptation results in a second set of one or more ROs, selecting an RO of the second set that was added via the adaptation, based on one or more rules, and transmitting a RACH preamble in the selected RO.