2-Step Random Access Conflict Resolution by Trigger Event
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing 2-step random access mechanism in New Radio (NR) systems lacks a reasonable conflict resolution solution for different trigger events, leading to varying requirements that are not adequately addressed.
Innovation Solution
A power control method and apparatus that determine conflict resolution on a 2-step RACH by checking if message B meets conditions specific to the trigger event, using C-RNTI for communication between the UE and the access network device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a contention-based 2-step random access mechanism is used to simplify the access process, then the access speed is improved, but the ability to resolve conflicts for different trigger events deteriorates
Solution Approach 1:
The patent applies dynamics by making the conflict resolution mechanism adaptive to different trigger events. The access network device dynamically selects different conflict resolution approaches based on the specific trigger event (e.g., uplink data arrival, cell handover, beam failure recovery), allowing the system to maintain both speed and adaptability in the 2-step random access process
Solution Approach 2:
The patent changes parameters by introducing event-specific conditions and message B formats. Different trigger events have different resolution conditions (e.g., whether to expect uplink grant, timing advance command, or both), allowing the system to resolve conflicts appropriately for each scenario while maintaining the simplified 2-step structure
2Device complexity
If a unified conflict resolution approach is used for all trigger events, then the system complexity is reduced, but the access success rate for specific scenarios deteriorates
Solution Approach 1:
The patent segments the conflict resolution process by dividing it into event-specific categories. Each trigger event type (uplink data arrival, cell handover, beam failure recovery) has its own resolution conditions and message B content requirements, allowing tailored solutions without creating a completely separate process for each event
Solution Approach 2:
The patent achieves universality by using a single 2-step random access framework that can handle multiple trigger events. The message B format is designed to be multi-functional, capable of carrying different conflict resolution information (UL grant, TAC, or both) depending on the trigger event, thus serving multiple purposes within one unified structure
Data Source
AI summary
The present disclosure discloses a 2-step random access method and apparatus, a device, and a medium, and relates to a field of wireless communication. The method includes: transmitting a message A, when a 2-step random access is triggered based on a trigger event, the message A carrying a Cell-Radio Network Temporary Identifier (C-RNTI) of a User Equipment (UE); receiving a message B; and determining that a conflict of the 2-step random access is resolved, when the message B satisfies a condition corresponding to the trigger event. The present disclosure may determine, based on whether the message B satisfies the condition corresponding to a trigger event, whether a conflict on a 2-step random access channel is resolved.