Beam-Specific RACH Occasion Density for 5G Network Congestion
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Solution Overview
Problem
Current 5G NR systems face RACH overloading and congestion due to a fixed number of RACH occasions across all beams, which cannot accommodate varying numbers of users effectively, especially in scenarios with a large number of RedCap or IoT devices accessing the network simultaneously.
Innovation Solution
The technique involves adjusting the density and number of RACH occasions for specific SSB beams based on usage, using a beam-specific bit-field transmitted by the base station to indicate alternative RACH occasion density, allowing for dynamic adjustment of RACH occasions to manage overloading without causing collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed number of RACH occasions is allocated to all beams, then the system configuration is simple and uniform, but the network cannot accommodate varying numbers of users effectively, leading to RACH overloading and congestion
Solution Approach 1:
The patent applies local quality by configuring different RACH occasion densities for different SSB beams based on their specific traffic conditions. Each beam can have its own RACH occasion density parameter, allowing beams with high user density to have more RACH occasions while beams with low user density maintain fewer occasions, thus resolving the contradiction between adaptability and complexity.
Solution Approach 2:
The patent implements dynamics by making RACH occasion density configurable and adjustable per beam rather than fixed. The network can dynamically adjust the RACH occasion density for each beam according to actual traffic conditions, enabling the system to adapt to varying user numbers while maintaining manageable complexity through standardized configuration mechanisms.
2Productivity
If RACH occasion density is increased for all beams, then network capacity is improved, but resource efficiency deteriorates for underloaded beams due to wasted RACH resources
Solution Approach 1:
The patent applies local quality by allocating RACH occasions locally to each beam according to its specific traffic load. Beams with high user density receive higher RACH occasion density to improve access capacity, while beams with low user density maintain lower RACH occasion density to avoid resource waste, thus resolving the contradiction between productivity and energy loss.
3Loss of energy
If RACH occasion density is decreased for all beams, then resource efficiency is improved, but network capacity deteriorates and cannot accommodate large numbers of simultaneous access requests
Solution Approach 1:
The patent applies local quality by allowing each beam to have its own RACH occasion density configuration. This enables beams with low traffic to use fewer RACH occasions (improving resource efficiency) while beams with high traffic can use more RACH occasions (maintaining network capacity), thus resolving the contradiction between resource efficiency and productivity.
4Productivity
If beam-specific RACH occasion density is implemented, then congestion is reduced by allowing more UEs to initiate access, but system complexity increases due to additional configuration parameters
Solution Approach 1:
The patent implements dynamics by introducing configurable RACH occasion density parameters that can be adjusted per beam. This allows the system to dynamically manage congestion by allocating more RACH occasions to congested beams while maintaining standard configuration procedures, thus resolving the contradiction between productivity and device complexity.
Data Source
AI summary
Aspects of the present disclosure provide techniques for adjusting the density and/or number of random access channel (RACH) occasion for one or subset of synchronization signal block (SSB) beams from the plurality of available SSB beams. To this end, features of the present disclosure utilize a beam-specific bit-field that is transmitted by the base station to the user equipment (UE) that may indicate RACH occasion density for a SSB beam or a subset of SSB beams. In some aspects, the time and frequency resources for RACH occasion with beam-specific alternative density may be identified via the resources for general RACH occasions. Based on the adjusted RACH occasion density, the UE may select one or time and frequency resources to initiate access with the base station.