Random Access Selection Using BWP Configuration and Downlink RSRP
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Solution Overview
Problem
The challenge of selecting appropriate types of random access and determining corresponding resources in wireless communication systems with multiple access types has become urgent due to advancements in technology.
Innovation Solution
A method and apparatus that determine a random access type based on bandwidth part (BWP) configuration and downlink reference signal received power, enabling selection of appropriate random access resources, including two-step and four-step processes with contention-free and contention-based options.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple types of random access are supported in communication standards, then the adaptability and versatility of the system is improved, but the complexity of selecting appropriate random access types and determining corresponding resources increases
Solution Approach 1:
The patent applies parameter changes by using downlink reference signal received power (RSRP) as a key parameter to determine the random access type. The terminal equipment measures the downlink RSRP and compares it against threshold values to select between four-step and two-step random access procedures. This parameter-based approach transforms a complex multi-type selection problem into a simplified decision process based on signal strength measurements, thereby maintaining system adaptability while reducing selection complexity.
2Productivity
If appropriate random access resources are selected based on BWP configuration and downlink reference signal received power, then the productivity and access efficiency is improved, but the measurement and detection requirements become more stringent
Solution Approach 1:
The patent implements preliminary action by having the terminal equipment measure downlink reference signal received power before initiating the random access procedure. The measurement of reference signals (such as SSB or CSI-RS) is performed in advance to determine both the random access type and the appropriate uplink resources. This preliminary measurement enables the terminal to select the most suitable access method and resources before actual access attempts, improving overall access efficiency while using standardized measurement techniques that are already part of the wireless communication protocol stack.
Data Source
AI summary
A terminal apparatus includes: a transmitter configured to transmit a first message (MsgA) of a random access procedure according to two-step contention-free random access resource configuration, the first message (MsgA) including a two-step contention-free random access preamble and a physical uplink shared channel; and processor circuitry configured to determine, when the terminal apparatus receives a media access control layer protocol data unit (MAC PDU) including a timing advance command media access layer control element (TAC MAC CE) after transmitting the first message, and the MAC PDU is successfully demodulated, that consider the random access successfully completed.