Random-Access Preamble Transmission Power Control via Reference Signal Selection
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Solution Overview
Problem
Current mobile communication networks face challenges in efficiently managing random access procedures across diverse wireless devices and base stations, particularly in handling varying technologies and releases, which affects network performance and resource allocation.
Innovation Solution
The implementation of advanced random-access procedures, including contention-based and contention-free methods, within the New Radio (NR) framework, which involves specific configurations and message exchanges between wireless devices and base stations to optimize access and resource management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional random access procedures are used in legacy networks, then compatibility with existing devices is maintained, but network efficiency and resource allocation performance deteriorate in diverse technology environments
Solution Approach 1:
The patent implements dynamic selection of random access procedures based on device capability and network conditions. The network can configure different random access procedures (legacy or enhanced) dynamically, allowing the system to adapt to diverse device types while optimizing performance for each scenario
Solution Approach 2:
The patent introduces new parameters and configuration options for random access procedures, including enhanced message structures and power control parameters. These parameter changes enable improved network efficiency while maintaining backward compatibility through selective activation based on device capability
2Productivity
If advanced random access procedures are implemented for improved network efficiency, then resource allocation performance improves, but device complexity and implementation difficulty increase
Solution Approach 1:
The patent segments the random access procedure into distinct phases and message types, with different complexity levels. Devices can implement only the portions relevant to their capability, reducing overall device complexity while enabling advanced features where supported
Solution Approach 2:
The patent designs a universal random access framework that can operate in multiple modes (legacy and enhanced). The same basic procedure structure serves both simple and advanced scenarios, reducing the need for separate implementations and lowering device complexity
3Adaptability or versatility
If contention-based random access is used for multiple devices, then access flexibility is improved, but collision probability and access delay increase
Solution Approach 1:
The patent enhances the random access procedure with improved feedback mechanisms, including more detailed acknowledgment messages and power control adjustments. This feedback allows devices to quickly resolve collisions and adjust their access attempts, maintaining flexibility while improving success probability
Solution Approach 2:
The patent implements preliminary configuration and reservation mechanisms where devices can pre-negotiate or reserve access resources before actual data transmission. This preliminary action reduces the likelihood of collisions during actual access while maintaining the flexibility of contention-based approaches
Data Source
AI summary
A wireless device comprises one or more processors and memory storing instructions that, when executed by the one or more processors. The instructions cause the wireless device to receive a physical downlink control channel (PDCCH) order triggering a random-access procedure, the PDCCH order comprising a field indicating a reference signal. A first value of the field indicates that the reference signal is a downlink reference signal that is quasi-collocated with a demodulation reference signal (DM-RS) of the PDCCH order. A second value of the field indicates that the reference signal is a synchronization signal block. The wireless device transmits, for the random-access procedure, a random-access preamble using a transmission power, wherein the transmission power of the random-access preamble is based on the reference signal indicated by the field.