UE Message Retransmission Using Multiple Spatial Filters
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Solution Overview
Problem
In 5G new radio (NR) wireless communication, high carrier frequencies result in significant radio signal loss, and the human body's proximity to user equipment (UE) limits transmit power due to safety constraints, leading to failed network access or delayed connections.
Innovation Solution
The UE employs a message retransmission method using multiple spatial filters or beam directions to increase transmit power, allowing it to retransmit messages in different beam directions when initial transmissions fail, thereby enhancing the chances of successful message delivery and accelerating network access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE transmits messages at power levels constrained by maximum permissive exposure (MPE) limits due to human body proximity, then safety requirements are met, but transmit power is severely limited causing signal transmission failure or large access delay
Solution Approach 1:
The patent segments the message transmission into multiple spatial directions using different spatial filters. Instead of concentrating all power in one direction, the transmission is divided across N different spatial filters, allowing the system to accumulate effective transmit power while adhering to MPE constraints in each individual direction.
Solution Approach 2:
The patent introduces a spatial dimension to the transmission problem by utilizing multiple spatial filters corresponding to different beam directions. This transforms the single-dimensional power limitation problem into a multi-dimensional solution where power is distributed across multiple spatial directions, effectively increasing total transmit power while maintaining compliance with MPE limits.
2Length of moving object
If the UE uses high carrier frequencies to achieve higher antenna gains and extend transmission distance, then signal transmission efficiency improves, but radio signal loss increases significantly
Solution Approach 1:
The patent merges multiple transmission paths by combining signals from N different spatial filters. By coherently combining these multiple paths, the system achieves signal accumulation that compensates for the high path loss inherent in high-frequency transmissions, effectively extending transmission distance despite the energy losses.
3Reliability
If the UE retransmits messages using multiple spatial filters to increase total transmit power, then message transmission success probability increases, but transmission complexity increases
Solution Approach 1:
The patent makes the spatial filter a universal component that serves multiple functions: it performs beamforming, spatial multiplexing, and power distribution simultaneously. By reusing the same set of N spatial filters for both initial transmission and retransmission, the system avoids the need for separate complex mechanisms while achieving diversified transmission paths.
Data Source
AI summary
A message retransmission method and a related apparatus are disclosed. The message retransmission method includes: User equipment sends a message to a network device at a first power using a first spatial filter; and the user equipment retransmits the message to the network device using N second spatial filters, where a second power ramping counter corresponding to a transmit power of each of P second spatial filters is greater than a first power ramping counter corresponding to the first power, and the N second spatial filters include at least one spatial filter different from the first spatial filter. Both N and P are positive integers, and P≤N.