Multi-Beam Random Access Procedure for 5G Wireless Networks
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Solution Overview
Problem
Existing 5G radio access networks face challenges in performing multi-beam-based random access procedures without available Tx/Rx channel reciprocity.
Innovation Solution
A method involving a base station that transmits information on RACH resources to a user equipment, receives multi-RACH preambles using multiple beams, and sends a random access response, while the user equipment receives RACH resource information, transmits multi-RACH preambles, and receives a random access response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-beam-based random access procedure is implemented in 5G NR, then uplink coverage and connection reliability are improved, but device complexity and procedure overhead increase due to beam management requirements
Solution Approach 1:
The random access procedure is segmented into multiple beam-specific steps where the base station transmits downlink reference signals through multiple beams, the user equipment measures and reports beam information, and the base station selects appropriate beams for subsequent uplink transmission. This segmentation allows systematic management of beam diversity without overwhelming complexity.
Solution Approach 2:
The base station performs preliminary beam sweeping and reference signal transmission before the actual random access preamble transmission. By pre-establishing the beam configuration and obtaining beam measurement reports from the user equipment in advance, the system reduces the complexity of real-time beam selection and ensures reliable connection setup.
2Area of stationary object
If multiple beams are used for RACH preamble transmission, then uplink coverage is enhanced, but time consumption increases due to beam switching and measurement procedures
Solution Approach 1:
The base station transmits downlink reference signals periodically across multiple beams in a systematic sequence. The user equipment measures these periodic signals and generates beam reports accordingly. This periodic beam sweeping approach enables comprehensive coverage while maintaining manageable time consumption through structured signal transmission intervals.
Solution Approach 2:
The user equipment provides feedback in the form of beam measurement reports to the base station, indicating which beams have sufficient signal quality. This feedback mechanism allows the base station to quickly identify suitable beams for uplink transmission, reducing the time required for beam selection and subsequent access procedures.
3Measurement precision
If beam-specific RACH resources are configured, then beam alignment accuracy is improved, but system overhead increases due to additional configuration information
Solution Approach 1:
Different beam directions are assigned with specific RACH resources and configuration parameters tailored to their individual characteristics. Each beam's reference signal is associated with specific identification information that enables the user equipment to accurately determine the corresponding uplink beam direction. This local quality approach ensures precise beam alignment while managing overhead through targeted configuration only where needed.
Data Source
AI summary
Provided is a method for a base station executing a multi-beam-based random access procedure in wireless communication, and a device therefor. The method may include: transmitting information associated with a RACH resource to a terminal; receiving a multi-RACH preamble from the terminal by a multi-beam; and transmitting a random access response to the terminal.