Random Access Channel Resource Mapping for Latency Reduction
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Solution Overview
Problem
The increasing number of user equipment (UEs) and data/control information to be transmitted by base stations (BSs) in wireless communication systems poses challenges in efficiently utilizing limited radio resources, particularly in reducing latency and supporting high-frequency band communications.
Innovation Solution
A method for transmitting and receiving random access channels (RACH) by UE and BS, involving the reception and transmission of RACH resource information and preamble sequences associated with synchronization signal blocks, allowing efficient use of limited radio resources and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of user equipments and data/control information to be transmitted increases, then communication capacity and data throughput increase, but efficient utilization of limited radio resources deteriorates
Solution Approach 1:
The patent segments the random access procedure into two distinct parts: a first random access message transmitted on a first uplink resource, and a second random access message transmitted on a second uplink resource. This segmentation allows the base station to receive and process random access messages from multiple user equipments simultaneously using different resources, thereby improving communication capacity while efficiently utilizing limited radio resources.
2Reliability
If traditional random access procedures are used, then compatibility with legacy systems is maintained, but latency is increased
Solution Approach 1:
The patent implements preliminary action by having the base station transmit downlink data to a user equipment before the user equipment completes the traditional four-step random access procedure. The base station can send data in advance using available uplink resources, and the user equipment can receive and buffer this data before finalizing the random access handshake. This preliminary data transmission reduces the overall latency while maintaining compatibility with legacy random access procedures.
Data Source
AI summary
A user equipment receives RACH resource information comprising connection relationship information between RACH resources and synchronization blocks of a cell, and RACH preamble information representing a preamble sequence dedicated to the user equipment. On the basis of the RACH resource information and the RACH preamble information, the user equipment transmits the preamble sequence on a first RACH resource connected with a first SS block of the cell, and transmits the preamble sequence on a second RACH resource connected with a second SS block of the cell.