Two-Step Random Access Fallback for Wireless Reliability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The conventional random access procedure in wireless communication systems, such as LTE and proposed 5G systems, faces challenges in meeting low latency requirements and suffers from potential higher decoding errors in two-step random access procedures, leading to increased latency and reliability issues.
Innovation Solution
Implementing a method where network and terminal devices can switch between different random access procedures, such as two-step and four-step RA procedures, based on detection success and configuration, allowing for fallback to a more reliable procedure in case of detection failures, using overlapping or separate resources and indicators for type identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a two-step random access procedure is used, then latency is reduced, but decoding error rate increases and reliability decreases
Solution Approach 1:
The patent implements dynamic switching between two-step and four-step random access procedures based on detection outcomes. The network device and terminal device can adaptively select the appropriate procedure type, transitioning from a static to a dynamic system that optimizes both latency and reliability depending on channel conditions and detection success
Solution Approach 2:
The patent changes the procedural parameter (random access type) based on detection results. When information portion detection fails, the system switches from two-step to four-step procedure, effectively using parameter change to resolve the contradiction between speed and reliability
2Reliability
If a four-step random access procedure is used, then reliability is improved, but latency increases
Solution Approach 1:
The system dynamically selects between four-step and two-step procedures based on real-time detection outcomes. When detection succeeds, the system transitions to the faster two-step procedure, making the reliability improvement conditional rather than absolute
Solution Approach 2:
The patent segments the random access procedure into distinct types (two-step and four-step) with different characteristics. This segmentation allows the system to choose the appropriate segment based on conditions, rather than using a single monolithic procedure
3Adaptability or versatility
If multiple random access procedure types are supported, then adaptability is improved, but system complexity increases
Solution Approach 1:
The patent makes the random access system multi-functional by supporting both two-step and four-step procedures within the same framework. The network device and terminal device can perform multiple procedure types using a unified mechanism, reducing the complexity overhead of supporting multiple separate systems
Data Source
AI summary
Methods, apparatuses and computer program provide for random access in a wireless communication system. A method implemented in a network device comprises receiving, from a terminal device, a signal for initiating an RA procedure of a first RA type, the signal including a preamble portion and an information portion. In response to successfully detecting the preamble portion of the signal, but failure in detection of the information portion of the signal, transmitting to the terminal device a first response indicating a successful detection of only a preamble portion of the signal, or a second response indicating an RA procedure of a second RA type different from the first RA type. The described technique may increase the reliability of a two-step RACH procedure and/or reduce consumption of time-frequency resources.