Parallel Random Access Preamble Transmission Power Management
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Solution Overview
Problem
Current multicarrier communication systems face challenges in efficiently managing signal timing and resource allocation across multiple carriers, leading to suboptimal performance in carrier aggregation and interworking between different radio access technologies.
Innovation Solution
The implementation of advanced signal processing techniques, such as OFDM and carrier aggregation, along with dynamic modulation and coding schemes, enables efficient signal timing and resource allocation across multiple carriers, facilitating seamless operation in multi-connectivity scenarios and tight interworking between 5G and LTE networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If multiple preambles are transmitted in parallel via a single cell, then the random access procedure completion time is reduced, but the uplink power requirement increases
Solution Approach 1:
The patent applies partial action by transmitting only a subset of the configured preambles when power constraints are detected. Instead of transmitting all parallel preambles, the device selectively transmits some preambles based on available power headroom, thus reducing power consumption while still achieving faster random access compared to sequential transmission.
Solution Approach 2:
The patent implements dynamic power control by adjusting the number of preambles transmitted based on real-time power headroom conditions. The device dynamically determines whether to transmit all configured preambles, a subset, or none at all, making the parallel transmission adaptive to varying power availability rather than static.
2Speed
If parallel preamble transmissions are configured, then random access speed is improved, but power management complexity increases
Solution Approach 1:
The patent applies self-service by enabling the wireless device to autonomously determine its own power headroom and make independent decisions about which preambles to transmit. The device uses its own measured power conditions to control the parallel transmission process without requiring complex network coordination or external power management assistance.
Solution Approach 2:
The patent implements feedback mechanisms where the device monitors its power headroom conditions and uses this feedback to adjust preamble transmission behavior. The power headroom information feeds back into the transmission decision process, creating a closed-loop system that adapts to changing power conditions.
Data Source
AI summary
A wireless device initiates a random access procedure for parallel transmissions of random access preambles for beams of a cell. A determination is made that a first calculated transmit power exceeds a first power value. The first calculated transmit power comprises transmission powers corresponding to the parallel transmissions of the random access preambles. In response to the determination, a first transmission of at least one first random access preamble of the random access preambles is dropped based on at least one first pathloss value corresponding to the first transmission being greater than at least one second pathloss value corresponding to a second transmission of at least one second random access preamble of the random access preambles. The at least one second random access preamble of the random access preambles is transmitted by the wireless device.