Dynamic Channel Access Procedure Gap Adjustment for Random Access
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Solution Overview
Problem
In wireless communication systems, particularly in 5G networks operating in unlicensed bands, the existing random access methods face challenges in efficiently accessing the channel due to high contention and interference, leading to reduced success probabilities for multiple PRACH preamble transmissions.
Innovation Solution
A method and device that adjust the channel access procedure gap and random access channel transmission interval based on the number of PRACH preamble transmissions, allowing for optimized channel access by modifying the cyclic prefix length or contention window values to improve the probability of successful access for both transmitting and receiving nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple PRACH preambles are transmitted in unlicensed bands, then the probability of successful random access is improved, but channel contention and interference increase
Solution Approach 1:
The patent applies dynamics by making the channel access procedure gap variable rather than fixed. The gap duration is dynamically adjusted based on the preamble transmission counter value, allowing the system to adapt the timing between preamble transmissions according to channel conditions and access attempts, thereby balancing success probability with interference management
Solution Approach 2:
The patent changes the time parameter (channel access procedure gap) based on the preamble transmission counter. By modifying the gap duration parameter according to the number of transmission attempts, the system optimizes the balance between achieving successful access and reducing channel contention, as different transmission stages require different timing characteristics
2Productivity
If the channel access procedure gap is reduced to increase transmission opportunities, then productivity is improved, but interference among transmissions increases
Solution Approach 1:
The channel access procedure gap is made dynamic rather than static. The gap duration changes based on the preamble transmission counter, providing shorter gaps for early transmissions to increase opportunities, while potentially extending gaps for later transmissions to reduce interference, thus adaptively balancing productivity and interference
3Object-generated harmful factors
If the channel access procedure gap is increased to reduce interference, then harmful factors are reduced, but transmission opportunities and productivity decrease
Solution Approach 1:
The patent implements a dynamic gap adjustment mechanism where the channel access procedure gap varies with the preamble transmission counter. This allows the system to provide sufficient transmission opportunities early in the access process while reducing interference in later stages, optimizing overall channel access efficiency without sacrificing too many transmission opportunities
Data Source
AI summary
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The present invention relates to a method and an apparatus for performing random access in a wireless communication system. More specifically, proposed is a method of, when a terminal intends to perform random access through multiple PRACH preamble transmission in an unlicensed band, determining whether to change or reset a CP length of a channel access procedure gap or a PRACH preamble according to the number of multiple PRACH preamble transmissions.