Cooperative Beam Selection for Multi-TRP Communication Systems
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Solution Overview
Problem
In communication systems with multiple physically separated transmission/reception points (TRPs), interference and performance degradation occur due to timing errors, increased complexity, and the need for extensive wired or wireless resources for channel information exchange, especially in dense terminal environments.
Innovation Solution
The method involves TRPs transmitting discovery signals with beam identifiers, receiving feedback on signal strengths, and selecting optimal beam pairs for data transmission, allowing each TRP to minimize interference and operate without calibration, while a controller determines transmission beams based on interference and signal strengths to enhance communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple physically separated TRPs are used to increase system capacity, then system capacity is improved, but timing errors and frequency offsets occur causing performance degradation
Solution Approach 1:
The patent applies preliminary action by having TRPs transmit discovery signals before actual data transmission to enable beam pair selection and interference assessment. This preliminary signaling phase allows the system to establish optimal transmission parameters in advance, avoiding timing and frequency issues during subsequent data transmission.
Solution Approach 2:
The patent implements feedback mechanisms where terminals report received signal strength information for different beam pairs, and TRPs transmit channel information to controllers. This feedback loop enables continuous optimization of transmission parameters and coordination between multiple TRPs to maintain timing accuracy and frequency synchronization.
2Reliability
If multiple physically separated TRPs transmit channel information to controller, then transmission coordination is improved, but resource consumption increases
Solution Approach 1:
The patent segments the channel information transmission process into two parts: TRPs transmit only essential channel information to the controller, while terminals independently select optimal beam pairs based on received signal strength measurements. This segmentation reduces the total amount of data that needs to be transmitted over the wired or wireless backhaul.
Solution Approach 2:
Terminals perform self-service by autonomously measuring received signal strengths for multiple beam pairs and selecting optimal beams without requiring exhaustive channel information from all TRPs. This self-selection mechanism reduces the communication overhead between TRPs and the controller while maintaining effective transmission coordination.
3Adaptability or versatility
If TRPs transmit discovery signals using multiple beams, then beam selection capability is improved, but interference between TRPs increases
Solution Approach 1:
The patent applies local quality by having each TRP transmit discovery signals using specific transmission beams with associated reception beams, allowing terminals to measure and report signal strengths for locally relevant beam pairs. This localized approach enables precise beam selection for each TRP-terminal link without requiring all TRPs to transmit simultaneously on all beams, thereby reducing overall interference.
Data Source
AI summary
An operation method performed by a terminal in a communication system may include: receiving, from a TRP, a first discovery signal including an identifier of a first transmission beam by using a first reception beam; measuring a first received signal strength of the first discovery signal; receiving, from the TRP, a second discovery signal including an identifier of a second transmission beam by using a second reception beam; measuring a second received signal strength of the second discovery signal; transmitting, to the TRP, first beam pair information including the identifier of the first transmission beam and an identifier of the first reception and the first received signal strength information; and transmitting, to the TRP, second beam pair information including the identifier of the second transmission beam and an identifier of the second reception beam and the second received signal strength information.