Random Access Parameter Selection Using gNB Reception Conditions
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Solution Overview
Problem
Current random access procedures in wireless communication networks, such as 5G NR, face challenges due to sub-optimal selection of SSB indexes and PRACH repetitions, leading to increased interference, collisions, and reduced success rates, as they do not account for varying gNB receiver conditions across different SSB indexes.
Innovation Solution
The proposed solution involves the gNB providing condition information to UEs about its reception conditions, allowing UEs to optimize the selection of SSB indexes and the number of PRACH repetitions based on signal quality, interference, collision probability, and latency, using supplementary information broadcast in system information blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple UEs use the same preamble simultaneously for random access, then the random access procedure can be initiated, but message collisions occur and transmission success rate decreases
Solution Approach 1:
The gNB performs preliminary assessment of receiver conditions (interference levels, collision probabilities, latency observations) and provides this information to UEs before they initiate random access. This allows UEs to make informed decisions about preamble selection and resource allocation, preventing collisions before they occur.
Solution Approach 2:
The system implements a feedback mechanism where the gNB observes random access outcomes (collisions, latency, interference) and uses this information to guide future random access decisions. The gNB provides feedback about receiver conditions that help UEs adjust their transmission strategies to avoid harmful interactions.
2Ease of operation
If UEs transmit random access messages without considering gNB receiver conditions, then the random access procedure can be performed, but interference and collisions increase
Solution Approach 1:
UEs autonomously adjust their random access behavior by selecting preambles and resources based on condition information provided by the gNB. Each UE independently evaluates the receiver conditions and makes its own transmission decisions, eliminating the need for centralized coordination while reducing interference and collisions.
3Reliability
If the gNB provides detailed condition information to all UEs, then UEs can optimize their random access transmissions, but signaling overhead increases
Solution Approach 1:
The gNB provides condition information that is specific to each SSB (Synchronization Signal Block) and associated PRACH resources. This localized information allows UEs to optimize their transmissions for specific beams and resources without requiring all UEs to receive and process all possible condition information, reducing overall signaling overhead.
Data Source
AI summary
There is provided a method, comprising: obtaining signal quality information on a plurality of downlink (DL) signals of a cell; receiving, from a network node of the cell, condition information indicative of reception conditions at the network node; based on the signal quality information and the condition information, determining at least one parameter for performing a random access to the cell; performing, based on the determined at least one parameter, the random access to the cell on a set of uplink (UL) resources.