Flexible-Cell Uplink RACH Carrier Selection by Signal Thresholds
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems lack a mechanism to select a carrier for uplink random access channel (RACH) transmissions in flexible cell configurations, which can lead to inefficiencies and increased interference due to the use of multiple carriers, including anchor and non-anchor carriers.
Innovation Solution
A method and apparatus for selecting a carrier within a flexible cell configuration for uplink RACH transmissions, where a user equipment (UE) or base station determines the carrier based on reference signal measurements exceeding predetermined thresholds, allowing for optimized carrier selection for RACH transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple carriers (anchor and non-anchor) are used in flexible cell configuration, then network capacity and coverage are improved, but interference increases and transmission reliability deteriorates
Solution Approach 1:
The patent segments the carrier selection process by dividing carriers into anchor carriers and non-anchor carriers, with each type serving specific functions. The UE is configured to select from this segmented set based on reference signal measurements, allowing the system to benefit from multiple carriers while managing interference through structured segmentation.
Solution Approach 2:
The patent changes the parameter of carrier selection by introducing reference signal measurement thresholds as a criterion for carrier selection. Instead of using all configured carriers, the UE measures reference signals and selects carriers where measurements exceed predetermined thresholds, dynamically adjusting the effective carrier set based on channel conditions to reduce interference.
2Device complexity
If carrier selection is not implemented in flexible cell configuration, then device complexity is reduced, but communication efficiency and performance deteriorate
Solution Approach 1:
The patent applies preliminary action by pre-configuring a set of carriers (anchor and non-anchor) and predetermined reference signal measurement thresholds before RACH transmission. The UE performs measurements and selects carriers based on these pre-established criteria, avoiding complex real-time decision-making while maintaining high communication efficiency through optimized carrier selection.
3Reliability
If reference signal measurement thresholds are used for carrier selection, then transmission reliability is improved, but measurement and detection complexity increases
Solution Approach 1:
The patent applies self-service by enabling the UE to autonomously perform reference signal measurements and compare them against predetermined thresholds to select the appropriate carrier for RACH transmission. This self-service mechanism improves reliability by ensuring the UE selects carriers with suitable channel conditions while keeping the implementation relatively simple through automated threshold-based decision-making.
Data Source
AI summary
Systems, methods, and devices for wireless communication that support mechanisms for uplink carrier selection for uplink random access channel (RACH) transmissions in a flexible cell configuration in a wireless communication system. A user equipment (UE) in a flexible cell selects at least one carrier for transmitting one or more uplink RACH transmissions to a base station. In aspects, the base station transmits an indication to the UE indicating which carrier the UE is to select for transmitting the one or more uplink RACH transmission. In aspects, the UE determines the carrier to transmit the one or more uplink RACH transmissions to the base station based on a comparison of reference signal measurements to predetermined thresholds. In these aspects, based on whether the measurements exceed the predetermined thresholds or not, the UE selects a carrier for transmitting the one or more uplink RACH transmission to the base station.