Two-Step RACH Preamble Mapping to PUSCH Resource Unit
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Solution Overview
Problem
Traditional methods for establishing timing synchronization between a new radio (NR) user equipment (UE) device and a base station are inefficient and inadequate in terms of performance, particularly in wireless communication systems that handle both voice and data transmission.
Innovation Solution
The implementation of a two-step random access channel (RACH) method using a new radio (NR) UE device, where a physical random access channel (PRACH) preamble is mapped to a physical uplink shared channel (PUSCH) resource unit, allowing for improved timing synchronization and efficient data transfer by combining PRACH preamble and PUSCH data into a single message (MsgA), and using RRC signaling to configure preamble groups based on different UE states (RRC_IDLE, RRC_INACTIVE, and RRC_CONNECTED).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional downlink and uplink synchronization methods are used, then timing synchronization can be established, but the efficiency and performance are inadequate
Solution Approach 1:
The patent combines the PRACH preamble transmission and PUSCH data transmission into a single two-step random access procedure. The UE transmits both the random access preamble and uplink data in one message (MsgA), and the base station responds with a single message (MsgB) containing both random access response and uplink grant. This merging eliminates the need for separate synchronization establishment and data transmission steps, thereby improving both synchronization performance and establishment efficiency simultaneously.
2Loss of time
If a single message combines PRACH preamble and PUSCH data, then latency is reduced and signaling efficiency is enhanced, but the message structure and decoding complexity increase
Solution Approach 1:
The patent segments the combined MsgA into distinct components with clear boundaries: a PRACH preamble portion and a PUSCH data portion. The base station similarly segments the response MsgB into a random access response portion and an uplink grant portion. This segmentation allows the receiver to process different components independently and in parallel, reducing the effective complexity despite the combined structure. The clear segmentation enables efficient parsing and processing, mitigating the complexity issue while maintaining the low-latency benefits of the single-message approach.
3Adaptability or versatility
If preamble groups are configured based on different UE states, then adaptability to various operational modes is improved, but the signaling overhead and configuration complexity increase
Solution Approach 1:
The patent creates a universal preamble group configuration mechanism that serves multiple UE states (RRC_IDLE, RRC_INACTIVE, and RRC_CONNECTED) through a single unified structure. The base station configures preamble groups with parameters that are applicable across different operational modes, and the UE adapts to its current state by selecting appropriate parameters from the universal configuration. This multi-functional approach eliminates the need for separate configuration sets for each UE state, thereby improving adaptability while reducing configuration complexity and signaling overhead.
Data Source
AI summary
The implementations disclosed provide apparatus, systems, and methods for channel structure construction for a two-step random access channel (RACH) using a new radio (NR) user equipment (UE) wireless device. The wireless device includes one or more computer processors configured to generate a physical RACH (PRACH) preamble mapped to a physical uplink shared channel (PUSCH) resource unit. The PRACH preamble is associated with a preamble group indicating a configuration of the PUSCH. The preamble group has a size indicated by radio resource control (RRC) signaling performed by the wireless device. A message is encoded including the PRACH preamble and a payload carried by the PUSCH. The configuration of the PUSCH includes parameters for decoding the message. The wireless device couples communicatively to a base station using the PUSCH. The message is transmitted to the base station. The base station decodes the message based on the parameters of the PUSCH configuration.