Network Node Uplink Grant Allocation for PRACH Load Management
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Solution Overview
Problem
Current wireless communication networks face challenges in efficiently managing uplink grants during Random Access procedures, particularly due to high collision probabilities and inefficient resource allocation, which can lead to increased latency and overhead in the network.
Innovation Solution
A method where a network node dynamically adjusts the number of uplink grants based on Physical Random Access Channel (PRACH) load thresholds, sending multiple grants during high load conditions and single grants during low load conditions, to minimize collisions and optimize resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple uplink grants are sent during high load conditions, then collision probability is reduced, but network overhead increases
Solution Approach 1:
The system dynamically adjusts the number of uplink grants based on real-time PRACH load conditions. When load is high, multiple grants are sent to reduce collisions; when load is low, single grants are sent to minimize overhead. This dynamic adaptation resolves the contradiction between reliability and resource efficiency.
Solution Approach 2:
The invention changes the parameter of grant quantity based on load threshold comparisons. By monitoring PRACH load and adjusting the number of grants accordingly, the system optimizes the trade-off between collision reduction and overhead management.
2Productivity
If multiple uplink grants are transmitted, then data transmission efficiency is improved, but latency increases due to additional processing
Solution Approach 1:
Uplink grants are prepared and transmitted in advance based on predicted load conditions. By proactively sending multiple grants when load is high, the system avoids later collisions and retransmissions, improving overall efficiency while managing latency through advance planning.
3Loss of substance
If single uplink grants are sent during low load conditions, then network overhead is reduced, but collision probability increases
Solution Approach 1:
The system continuously monitors PRACH load conditions and uses this feedback to adjust grant transmission strategy. When load is low, single grants are sent to minimize overhead; when load increases, the system detects this change and switches to multiple grants to prevent collisions, creating a closed-loop control system.
Data Source
AI summary
A network node (206) and a method for transmitting uplink grants to a communications device (208), wherein the communications device operates in a service area (206a) served by the network node. The network node determines, based on a load measure on a Physical Random Access Channel, PRACH, between the network node and the communications device in relation to a load threshold, a number of uplink grants that are to be associated with a Random Access Preamble Identity, RAPID, of a PRACH preamble transmission received from the communications device. Further, the network node indicates the determined number to the communications device; and transmits the determined number of uplink grants to the communications device.