Carrier-Frequency Random Access with Dynamic 2-Step Selection
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Solution Overview
Problem
Existing wireless communication standards face latency issues due to signaling overhead in the random access process, which can be exacerbated by multiple devices attempting access simultaneously, necessitating a more efficient two-step and four-step random access process selection based on current circumstances.
Innovation Solution
A method and apparatus for contention-based random access in a carrier frequency that supports a two-step random access procedure, involving the transmission of a physical random access channel preamble and a physical uplink channel carrying data, with a network entity configuring time-frequency resources and demodulation reference signals to optimize latency and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a four-step random access procedure is used, then reliability is improved, but latency increases and signaling overhead increases
Solution Approach 1:
The patent implements dynamic selection between two-step and four-step random access procedures based on real-time conditions. The user equipment determines which procedure to use by evaluating path loss estimates and reference signal received power measurements, allowing the system to adapt the access procedure length to current network conditions rather than using a fixed approach
Solution Approach 2:
The patent changes the parameter of random access procedure length from fixed to variable. By monitoring path loss and reference signal received power, the system dynamically adjusts whether to use a two-step or four-step procedure, optimizing the balance between latency and reliability based on current channel conditions
2Reliability
If a four-step random access procedure is used, then reliability is improved, but signaling overhead increases
Solution Approach 1:
The system dynamically adjusts the random access procedure length based on real-time path loss and reference signal received power measurements. When conditions favor faster access, the two-step procedure is selected, reducing the quantity of signaling messages exchanged while maintaining adequate reliability
Solution Approach 2:
The patent changes the parameter of procedure length from fixed four-step to variable two-step or four-step based on channel conditions. This reduces the average signaling overhead when two-step procedures are successfully used, while maintaining the option for four-step procedures when reliability is critical
3Productivity
If multiple devices attempt access simultaneously, then productivity is improved, but interference increases and collision probability increases
Solution Approach 1:
The patent segments the random access preambles into different sets corresponding to different procedures (two-step and four-step). This segmentation allows devices to be distributed across different access pathways, reducing the probability of simultaneous collisions and improving overall system throughput
Data Source
AI summary
A method and user equipment are provided, in which an indication that a cell in a carrier frequency supports a 2-step random access procedure is received. A physical random access channel preamble is transmitted on a first time-frequency resource. A physical uplink channel carrying data is transmitted, where the physical uplink channel carrying the data is associated with the transmitted physical random access channel preamble. In response to the transmitted physical random access channel preamble and the transmitted physical uplink channel carrying the data, a user equipment specific channel is received within a random access response window The data includes a user equipment identity.