On-Demand System Information Acquisition via Pilot Code Random Access
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The periodic broadcast of System Information (SI) in LTE networks leads to increased power consumption and inefficient resource utilization, especially when the number of User Equipment (UE) is low, causing latency and resource wastage due to failed random access requests.
Innovation Solution
A method where User Equipment (UE) sends a first random access request carrying a pilot code to identify the desired system information, monitors for a response message within a preset time, and upon detection, receives the system information within its transmission window, with repeated requests if necessary to ensure successful acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If system information is sent in periodic broadcast manner, then all user equipment can receive the information, but power consumption of base station increases and spectrum resource utilization decreases
Solution Approach 1:
The patent segments system information into two types: Type 1 SI (broadcast to all UEs) and Type 2 SI (requested individually). This segmentation allows the base station to broadcast only essential information periodically while providing other information on-demand, reducing unnecessary power consumption and spectrum waste when fewer UEs are present.
Solution Approach 2:
The patent implements a self-service mechanism where UEs autonomously request Type 2 SI through random access requests when needed. The base station responds to these requests by broadcasting the specific SI within a transmission window, eliminating the need for continuous periodic broadcasting of all SI types.
2Reliability
If system information is sent in periodic broadcast manner, then information is always available, but resource utilization rate decreases
Solution Approach 1:
By dividing SI into Type 1 (broadcast) and Type 2 (on-demand), the patent ensures Type 1 remains periodically available for reliability while Type 2 is transmitted only when requested, optimizing spectrum utilization by eliminating unnecessary broadcasts.
Solution Approach 2:
The patent maintains periodic broadcasting for Type 1 SI to ensure availability, while Type 2 SI uses event-triggered transmission based on UE requests. This hybrid approach preserves reliability for critical information while improving overall resource efficiency.
3Use of energy by moving object
If UE sends random access request with low power, then device power consumption is reduced, but request may fail and latency increases
Solution Approach 1:
The patent uses preliminary action by having UEs send random access requests with adequate power before attempting to acquire Type 2 SI. The base station responds within a preset time window, ensuring the request is successfully received and processed, thereby avoiding retransmission delays while maintaining reasonable power consumption.
Solution Approach 2:
The patent implements feedback mechanisms where the base station acknowledges UE requests within a transmission window. This feedback ensures successful request reception and coordinates the timing of SI transmission, reducing latency caused by failed requests or mismatched transmission timing.
Data Source
AI summary
A method for requesting system information, includes: sending a first random access request, wherein the first random access request carries at least one pilot code for identifying system information to be requested; monitoring a response message corresponding to the first random access request within a preset time period, wherein the response message carries information for responding to the at least one pilot code; and when the response message is detected, based on a pilot code identifier included in the response message, monitoring and receiving system information corresponding to the pilot code identifier within a transmission window of the system information corresponding to the pilot code identifier.