On-Demand System Information Acquisition via Random Access Preamble
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Solution Overview
Problem
Existing communication technologies face significant signaling overhead and resource wastage when User Equipment (UE) acquires system information from the network, requiring multiple interactions and fixed broadcasting periods, which complicates the on-demand acquisition process.
Innovation Solution
An on-demand acquisition method where a random access preamble is transmitted to request system information, and indication information from the random access response is used to acquire the information in either broadcast or unicast mode, simplifying interactions and reducing signaling overhead by utilizing guide information to identify relevant fields in the response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If system information is broadcasted continuously from network to UE, then UE can always acquire the latest system information, but UE must monitor broadcast channel all the time causing resource waste and increased signaling overhead
Solution Approach 1:
The network performs preliminary action by broadcasting system information in advance during designated time windows, allowing UE to acquire information proactively without continuous monitoring. The network prepares and transmits SI in scheduled intervals, enabling UE to sleep between transmissions while still accessing updated information when needed.
Solution Approach 2:
The patent implements periodic broadcasting of system information at configured intervals rather than continuous broadcasting. The network transmits SI periodically based on broadcasting period parameters, and UE monitors only during these periodic windows, significantly reducing energy consumption while maintaining information freshness.
2Adaptability or versatility
If UE requests system information through multiple interaction steps, then on-demand acquisition is achieved, but the acquisition process becomes complicated with increased signaling overhead
Solution Approach 1:
The patent merges multiple acquisition methods (broadcast and unicast) into a unified procedure where UE sends a single request message and the network responds with system information through the most appropriate channel. This consolidation simplifies the interaction from multiple separate steps to a streamlined single-exchange process, reducing signaling overhead while maintaining on-demand flexibility.
Solution Approach 2:
The request message structure is designed to be universal, capable of triggering both broadcast and unicast transmission modes depending on network configuration and SI type. This multi-functional request mechanism allows the same UE action to result in different transmission modes, simplifying UE behavior while providing network flexibility.
3Adaptability or versatility
If network reserves dedicated resources for on-demand SI broadcast, then on-demand acquisition is enabled, but resources are wasted when no UE requests SI
Solution Approach 1:
The patent implements dynamic resource allocation where the network adjusts SI transmission resources based on real-time UE requests. When UEs request system information, the network activates dedicated broadcast resources; when no requests are present, the network reconfigures resources to other transmissions. This dynamic switching enables on-demand capability while eliminating idle resource waste.
Solution Approach 2:
The network changes transmission parameters (resource allocation, broadcasting period, transmission mode) based on request patterns. When SI requests are detected, the network modifies parameters to enable dedicated on-demand transmission; when requests are absent, parameters are adjusted to reallocate resources, optimizing the balance between on-demand capability and resource efficiency.
4Loss of information
If UE monitors broadcast channel continuously, then system information is always available, but signaling overhead increases and resources are wasted
Solution Approach 1:
The patent extracts the essential system information into discrete broadcast windows rather than continuous streams. The network separates SI transmission into specific time-allocated segments, allowing UE to extract and process information only when transmitted, eliminating unnecessary continuous monitoring and reducing overall signaling overhead while maintaining information availability.
Data Source
AI summary
On-demand acquisition method and device of SI are provided. The method includes transmitting a random access preamble to a network, and the random access preamble is used at least for requesting the SI, acquiring indication information related to the SI based on a random access response received from the network; and acquiring the SI, based on the indication information, from the network in broadcast or unicast mode, and the indication information is used for indicating time sequence information and a mode of acquiring the SI. Interaction process between the UE and the network may be simplified, which further effectively reduces signaling overhead during the interaction and avoids a waste of resources.