Random Access Preamble Segmentation for 5G Resource Allocation
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Solution Overview
Problem
In wireless communication systems, particularly in 5G networks, the existing random access procedures face challenges in efficiently handling contention-based and contention-free random access scenarios due to the complexity of resource allocation and synchronization across different bandwidth parts and numerologies, especially in scenarios where UEs have limited capabilities and operate within very high frequency ranges.
Innovation Solution
The method involves dividing random access preambles into different sets for contention-based and contention-free access, allowing the network node to transmit the random access response on specific downlink resources linked to the selected preamble, enabling the wireless device to monitor these resources accordingly, and managing bandwidth part timers to ensure seamless resource switching during the random access procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If random access preambles are divided into different sets for contention-based and contention-free access, then resource allocation efficiency is improved, but device complexity increases
Solution Approach 1:
The patent divides random access preambles into different sets (first set for contention-based access, second set for contention-free access) to enable differentiated resource allocation. This segmentation allows the network to efficiently manage different types of random access requests separately, improving overall resource allocation efficiency while maintaining clear device procedures for selecting and monitoring appropriate resources.
2Reliability
If specific downlink resources are linked to selected preambles for RAR transmission, then random access response reliability is improved, but synchronization complexity across bandwidth parts increases
Solution Approach 1:
The patent establishes predetermined linkages between random access preambles and specific downlink resources for RAR transmission before the actual random access occurs. The network node is configured to transmit RAR messages on specific downlink resources that are pre-associated with particular preambles, and the wireless device is pre-configured to monitor these specific resources after transmitting a selected preamble. This preliminary association simplifies the synchronization process during actual random access operations.
3Stability of the object's composition
If bandwidth part timers are managed during random access procedure, then resource switching seamlessness is improved, but timer management complexity increases
Solution Approach 1:
The patent introduces dynamic timer management for bandwidth parts during the random access procedure. The network node configures the wireless device with timers that control switching between active and inactive bandwidth parts. These timers are dynamically adjusted based on the random access procedure state, allowing seamless resource switching while providing clear termination conditions that simplify device implementation.
4Adaptability or versatility
If random access procedures support multiple numerologies and frequency ranges, then system adaptability is improved, but procedure complexity increases
Solution Approach 1:
The patent designs the random access procedure to universally support multiple numerologies and frequency ranges through a unified framework. The same basic procedure structure (preamble selection from divided sets, RAR monitoring on linked resources, bandwidth part timer management) applies across different numerologies (e.g., 15kHz, 30kHz, 60kHz subcarrier spacings) and frequency ranges (sub-6GHz, mmWave). This universal approach allows the system to adapt to various 5G deployment scenarios while maintaining consistent device procedures.
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AI summary
There is provided a method, performed by a wireless device in a wireless communication system, for receiving a random access response, RAR, message from a network node. The method comprises transmitting (S11) a selected random access preamble to the network node, the selected preamble being linked to specific downlink, DL, resources to be used for communicating the RAR message from the network node to the wireless device, and receiving (S13) the RAR message from the network node on the specific DL resources. There is also provided a corresponding method performed by a network node, as well as wireless devices and network nodes and computer programs and corresponding carriers.