Random Access Power Control via Sub-band Selection
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Solution Overview
Problem
Current random access procedures in multicarrier communication systems face challenges in efficiently managing uplink and downlink transmissions, particularly in dynamic channel conditions and multi-beam operations, leading to suboptimal resource allocation and increased power consumption.
Innovation Solution
The implementation of advanced random access procedures that incorporate dynamic channel mapping, beam management, and bandwidth adaptation, utilizing techniques such as OFDM/CDMA and QAM modulation, to optimize resource allocation and reduce power consumption by adapting to changing channel conditions and beam quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dynamic channel mapping and beam management are implemented, then resource allocation efficiency is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic channel mapping where the mapping between physical channels and resources is adapted based on real-time channel conditions and beam quality. The system dynamically adjusts resource allocation parameters including bandwidth parts, frequency offsets, and time resources according to measured channel state information, transforming static resource allocation into a dynamic adaptive process that improves efficiency while managing complexity through structured adaptation rules
Solution Approach 2:
The system changes multiple parameters simultaneously including bandwidth part configurations, frequency offsets, time resource allocations, and power control parameters based on channel conditions. By coordinating changes across these parameters rather than individually optimizing each, the system achieves improved resource allocation efficiency while the structured parameter management prevents exponential complexity growth
2Use of energy by moving object
If bandwidth adaptation and dynamic resource allocation are used, then power consumption is reduced, but reliability of random access decreases
Solution Approach 1:
The system adapts transmission power and bandwidth parameters based on measured channel conditions and beam quality metrics. When channel conditions are good, the system reduces bandwidth and power for random access transmissions, and when conditions deteriorate, it increases these parameters to maintain reliability. This dynamic parameter adjustment optimizes the trade-off between power consumption and access reliability
Solution Approach 2:
The system implements feedback mechanisms where random access outcomes, channel quality indicators, and beam measurement results are used to adjust subsequent transmission parameters. The network provides feedback through random access responses and power control commands, enabling the UE to adapt its power and resource usage while maintaining reliable access through continuous optimization based on actual system performance
3Productivity
If multi-beam operations with dynamic mapping are implemented, then network performance is improved, but ease of operation deteriorates
Solution Approach 1:
The system segments the wide bandwidth into multiple bandwidth parts, each associated with specific beam directions and channel conditions. This segmentation allows independent optimization and management of different beam resources, improving network performance through targeted resource allocation while simplifying operation by providing structured, modular beam management that can be controlled through standardized procedures
Data Source
AI summary
A wireless device transmits a first preamble via a first sub-band. The wireless device determines to perform a first preamble retransmission based on receiving no response to the first preamble. The wireless device selects, for the first preamble retransmission, a second sub-band. Based on the second sub-band being different from the first sub-band, the wireless device determines that a transmission power of the first preamble retransmission may be based on a same value of a power ramping counter used for transmitting the first preamble. The wireless device transmits, based on the transmission power, a second preamble for the first preamble retransmission via the second sub-band.