Multi-Beam RACH Reception via Precoding Vector Switching
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Solution Overview
Problem
In radio communication systems, the reception quality of the Random Access Channel (RACH) preamble at the base station is degraded due to the lack of estimation of the uplink propagation channel before receiving the RACH preamble, which affects initial connection establishment.
Innovation Solution
The use of multi-beams with Precoding Vector Switching (PVS) to cyclically switch beams for transmitting the Synchronous Channel (SCH), allowing the user equipment to select the best beam for RACH preamble transmission based on reception quality, and the base station to receive the preamble using the beam with the smallest propagation channel loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station uses a single beam for transmitting the Synchronous Channel (SCH), then the device complexity is reduced, but the reception quality of the RACH preamble is degraded due to inability to adapt to different propagation conditions
Solution Approach 1:
The base station dynamically switches between multiple beams for transmitting the SCH based on propagation conditions. The beam switching is controlled by a predetermined cycle, allowing the system to adapt to changing channel conditions while maintaining manageable complexity through structured operation patterns.
Solution Approach 2:
The system changes the beam parameter (precoding vector) cyclically according to a predetermined pattern. By varying the beam direction/characteristics over time in a controlled manner, the system improves RACH preamble reception quality without requiring complex real-time optimization mechanisms.
2Ease of operation
If the user equipment transmits the RACH preamble without prior uplink channel estimation, then the initial connection establishment process is simplified, but the reception quality of the RACH preamble is degraded
Solution Approach 1:
The base station performs preliminary actions by transmitting the SCH using multiple switched beams before the UE transmits the RACH preamble. This preliminary beam switching enables the base station to have multiple beam options ready, improving the likelihood of receiving the RACH preamble with high quality without requiring the UE to perform complex channel estimation procedures.
3Reliability
If the base station transmits SCH using multiple beams with Precoding Vector Switching (PVS), then the reception quality of the RACH preamble is improved, but the device complexity increases due to multiple beam management
Solution Approach 1:
The base station transmits the SCH using multiple beams in a periodic manner with a predetermined cycle. This periodic beam switching pattern allows the system to explore multiple beam options systematically while maintaining manageable complexity through regular, predictable operation cycles that can be pre-planned and efficiently executed.
Data Source
AI summary
A user equipment transmits information for a radio base station using either of radio resources associated with individual multi-beams, which may be formed by the radio base station, and the radio base station performs reception processing of the radio resources for the individual multi-beams.