Cell-Specific Power Control for Two-Step Random Access
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing power control for random access protocols, particularly in 5G and NR systems, due to interference and resource allocation inflexibility, which affects spectral efficiency and user capacity.
Innovation Solution
Implementing a method for UEs to determine their transmit power in a 2-step RACH procedure based on cell-specific broadcast information, using resource and geographical data, without UE-specific signaling, to mitigate inter-cell interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional 4-step random access protocol is used, then compatibility with existing systems is maintained, but access latency increases and spectral efficiency decreases
Solution Approach 1:
The patent segments the traditional 4-step random access procedure into a simplified 2-step procedure by combining message exchanges. Specifically, it merges the preamble transmission and payload transmission into a single uplink message (MsgA), and combines the random access response and uplink grant into a single downlink message (MsgB), thereby reducing access latency while maintaining system compatibility through backward-compatible design
2Device complexity
If power control is implemented without cell-specific broadcast information, then UE-specific signaling overhead increases, but power control flexibility is reduced
Solution Approach 1:
The patent applies local quality by introducing cell-specific power control parameters that are broadcast to all UEs in a particular cell. These parameters allow each cell to have customized power control characteristics tailored to its specific interference conditions and deployment scenario, achieving localized optimization without requiring individual UE-specific signaling for each power control adjustment
Solution Approach 2:
The patent changes the power control parameters from UE-specific to cell-specific by introducing new broadcast information elements that carry power control configurations at the cell level. This parameter change enables more flexible power control adaptation to different cell conditions while reducing the signaling overhead associated with UE-specific power control commands
3Reliability
If transmit power is increased to overcome interference, then connection reliability improves, but spectral efficiency deteriorates due to excessive power consumption
Solution Approach 1:
The patent implements feedback mechanisms where the network node monitors the random access success rate and interference levels, then adjusts the cell-specific power control parameters accordingly. This closed-loop feedback enables dynamic optimization of transmit power to achieve the minimum necessary for reliable connection establishment, avoiding excessive power consumption that would harm spectral efficiency
Data Source
AI summary
Methods, systems, and devices for power control for random access protocols in mobile communication technology are described. An exemplary method for wireless communication includes broadcasting, by a network node serving a cell, an indication of a transmit power level that is specific to the cell, wherein the indication is for use by a wireless device operating in the cell for a two-step random access procedure. Another exemplary method for wireless communication includes receiving, by a wireless device operating in a cell served by a network node, an indication of a transmit power level that is specific to the cell for use in a two-step random access procedure, and transmitting, at the transmit power level, a first message of the two-step random access procedure.