5G Random Access Resource Mapping for Multi-Beam PRACH
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Solution Overview
Problem
In 5G wireless communication systems, determining available random access resources and configuring appropriate transmit power for random access preambles is challenging due to the use of high-frequency bands and multi-beam operations, leading to increased collision probability and overhead in informing transmit power.
Innovation Solution
A method and apparatus for determining initial active uplink bandwidth parts (UL BWP) and corresponding random access resources, including configuring and transmitting configuration information to user equipment (UE) for accurate random access procedures, and optimizing transmit power based on reference signal receiving power and path loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If configuration information of transmit power is informed for each synchronization signal block, then transmit power accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent merges transmit power configuration for multiple synchronization signal blocks into a single configuration. Specifically, it configures a first quantity of synchronization signal blocks to use a first transmit power and a second quantity of synchronization signal blocks to use a second transmit power through unified configuration information, thereby reducing signaling overhead while maintaining transmit power accuracy.
Solution Approach 2:
The patent changes the parameter representation by introducing a quantity parameter (first quantity vs. second quantity of synchronization signal blocks) instead of configuring each block individually. This parameter change allows the system to control transmit power for groups of blocks efficiently, reducing overhead while preserving accuracy.
2Productivity
If random access resources are allocated in high-frequency bands with multi-beam operations, then system capacity is improved, but collision probability increases
Solution Approach 1:
The patent segments random access resources by associating different synchronization signal blocks with different random access occasions. By dividing the synchronization signal blocks into groups (first quantity and second quantity) with different transmit powers and corresponding random access resources, the system increases overall capacity while reducing collisions through differentiated resource allocation.
Solution Approach 2:
The patent applies local quality by assigning different transmit powers to different groups of synchronization signal blocks based on their specific conditions. This localized power configuration optimizes the random access process for each group, improving reliability by reducing collision probability in high-capacity multi-beam scenarios.
Data Source
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AI summary
The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates beyond 4th-Generation (4G) communication system such as long term evolution (LTE). The method for operating a terminal in a wireless communication system is provided. The method includes receiving, from a base station, configuration information of an initial active uplink bandwidth part (UL BWP) and corresponding random access resource; based on the configuration information of the initial active UL BWP and the corresponding random access resource, determining corresponding physical random access channel (PRACH) occasions; and performing random access procedure based on the determined PRACH occasion.