UE Random Access Preamble Transmission Timing Alignment
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Solution Overview
Problem
In wireless communication systems, especially in Evolved Universal Terrestrial Radio Access Networks (E-UTRAN), the current methods for handling transmission in serving cells are inefficient due to the lack of precise control over beam generation, leading to unnecessary power consumption and missed signaling opportunities, particularly when user equipment (UE) transmits or receives signals outside the generated beams.
Innovation Solution
The method involves the UE deciding whether to transmit a Random Access Preamble or an aperiodic reference signal based on detected beams or beam groups, using information provided by the base station regarding beam generation times and opportunities, thereby optimizing transmission and reception timing to align with active beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE transmits or receives signals outside the generated beams, then the UE can maintain continuous communication attempts, but the power consumption increases unnecessarily and signaling may be missed
Solution Approach 1:
The base station provides beam generation timing information to the UE in advance. The UE uses this information to determine when beams will be generated and schedules its transmissions accordingly, performing the necessary timing alignment before actual transmission occurs. This prevents wasted power on transmissions outside active beams while ensuring signaling is sent during appropriate beam periods.
Solution Approach 2:
The base station provides feedback to the UE about beam generation timing and opportunities. The UE uses this feedback information to adjust its transmission and reception timing dynamically, ensuring it only operates during periods when beams are active. This feedback mechanism eliminates unnecessary power consumption while maintaining reliable signaling.
2Productivity
If the UE transmits Random Access Preamble without beam timing information, then the procedure can be initiated, but transmissions may occur outside active beams reducing efficiency
Solution Approach 1:
Before the UE initiates Random Access Preamble transmission, the base station provides beam generation timing information in advance. The UE uses this information to determine the appropriate timing for preamble transmission, ensuring it occurs during active beam periods. This preliminary timing alignment improves Random Access efficiency while preventing wasted transmission power.
3Reliability
If the UE monitors DL control signaling continuously, then no signaling is missed, but power consumption increases due to monitoring outside beam periods
Solution Approach 1:
The base station provides beam generation timing information to the UE before the UE begins monitoring DL control signaling. The UE uses this information to determine when beams will be generated and schedules its monitoring activities accordingly. This ensures reliable signal reception during active beam periods while avoiding unnecessary power consumption during periods when no beams are generated.
Data Source
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AI summary
A method and apparatus for handling transmission in a wireless communication system. In one embodiment, the method includes initiating a RA procedure, by a UE, in a serving cell (705). The method also includes deciding whether to transmit a RA Preamble, by the UE, in the serving cell at a specific timing during the RA procedure based on at least one information that includes beam(s) (or beam group(s)) of the serving cell detected by the UE (710).