User Equipment RACH Resource Selection Mapping
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Solution Overview
Problem
In NR communication systems, the number of RACH resources required to transmit a preamble does not necessarily match the number of resources determined based on the RACH Configuration, making it challenging to appropriately select RACH resources for preamble transmission in an SS burst set.
Innovation Solution
User equipment is equipped with a reception unit to detect synchronization signals or physical broadcast channels and a resource selection unit that selects RACH resources based on a mapping rule, with a period determined by the duration of the synchronization signal burst set and the available transmission period, allowing for appropriate selection of RACH resources for preamble transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RACH resources are selected based on the number of SS blocks in an SS burst set, then the number of RACH resources matches the number of SS blocks, but the number of RACH resources does not necessarily match the number of RACH resources determined based on the RACH Configuration
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the mapping period between SS blocks and RACH resources based on the determined period (which is the LCM of the SS burst set period and the RACH resource period). This allows the system to adapt the resource selection parameters to match both the SS burst set configuration and the RACH Configuration, resolving the mismatch issue while maintaining reliability.
2Ease of operation
If a mapping rule is used to select RACH resources according to SS blocks, then resource selection becomes systematic, but the period determination becomes complex due to multiple constraints
Solution Approach 1:
The patent applies preliminary action by pre-determining the mapping period as the LCM of the SS burst set period and the RACH resource period before actual resource selection. This pre-calculation simplifies the subsequent resource selection process, as the mapping rule can then be applied systematically without needing to handle multiple constraints dynamically during operation.
Data Source
AI summary
In one aspect of the present invention, user equipment includes a reception unit configured to detect a synchronization signal or a physical broadcast channel from a base station; a resource selection unit configured to select, from resources determined based on configuration information for preamble transmission, a resource for transmitting a preamble according to the detected synchronization signal or the detected physical broadcast channel based on a mapping rule, with a period determined based on at least one of a period of a synchronization signal burst set that is a duration during which the synchronization signal or the physical broadcast channel can be transmitted and a period of a resource available for transmission of the preamble; and a transmission unit configured to transmit the preamble to the base station on the selected resource.