Dynamic 2-Step Random Access Configuration for 5G Delay Reduction
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Solution Overview
Problem
Current 5G communication systems face challenges in providing smooth services due to delays in the random access procedure, particularly in the 4-step random access process, which can be exacerbated in unlicensed bands leading to collisions and increased delay.
Innovation Solution
A method for a user equipment (UE) in a wireless communication system that receives configuration information from a base station to determine whether to perform a 2-step or 4-step random access procedure, allowing for the reduction of the random access process to two steps by simultaneously transmitting preambles and omitting unnecessary steps, thereby reducing collisions and delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a 4-step random access procedure is used, then compatibility with existing systems is maintained, but access delay increases and collision probability increases
Solution Approach 1:
The patent segments the random access procedure into two distinct types: 2-step random access and 4-step random access. The UE determines which procedure to use based on configuration information received from the base station, allowing the system to select the optimal procedure for each specific scenario, thereby reducing overall access delay while maintaining compatibility through the availability of the 4-step option.
Solution Approach 2:
The patent introduces dynamic selection between 2-step and 4-step random access procedures based on real-time configuration information. The base station can dynamically configure the UE to use the 2-step procedure when conditions are favorable (reducing delay) while falling back to the 4-step procedure when necessary (maintaining reliability), creating a flexible and adaptive random access mechanism.
2Stability of the object's composition
If a 4-step random access procedure is used, then system stability is maintained, but collision probability increases in unlicensed bands
Solution Approach 1:
The patent segments the random access approach into two distinct procedures with different collision characteristics. The 2-step procedure reduces the number of steps and potential collision points, while the 4-step procedure provides a more traditional, stable approach. By allowing dynamic selection between the two, the system can avoid collisions in unlicensed bands while maintaining overall stability.
Solution Approach 2:
The patent changes the procedural parameters of the random access mechanism by introducing a 2-step variant that modifies the traditional 4-step sequence. This parameter change (reducing steps from 4 to 2) directly impacts collision probability in unlicensed bands while the configuration mechanism ensures system stability is maintained through selective application.
3Loss of time
If a 2-step random access procedure is used, then access delay is reduced, but configuration complexity increases
Solution Approach 1:
The patent applies preliminary action by having the base station provide configuration information to the UE before the random access procedure begins. This pre-configuration includes indicators that tell the UE whether to use 2-step or 4-step random access, eliminating the need for complex real-time decision-making and reducing configuration complexity while enabling the use of the faster 2-step procedure when appropriate.
Data Source
AI summary
A method of performing a random access of a user equipment (UE) in a wireless communication system includes receiving configuration related to the random access from a base station (BS), when the random access is triggered, determining whether to perform a first random access procedure or a second random access procedure, based on the received configuration information related to the random access, and performing, based on a result of the determining, the random access according to the first random access procedure or the second random access procedure.