Wireless Warning Message Reception via BCCH Scheduling
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Solution Overview
Problem
In conventional Cell Broadcast Service schemes, terminals face delays in promptly receiving scheduling information for warning messages due to the transmission of this information through Common Traffic Channels, which are received after control channels, leading to inefficient radio resource usage and delayed message reception.
Innovation Solution
The method involves receiving system information through a Broadcast Control Channel (BCCH) that includes scheduling information for warning messages, allowing terminals to monitor a physical downlink control channel for a specific time window and receive warning messages via a downlink shared channel, utilizing Hybrid Automatic Repeat Request (HARQ) for retransmissions and minimizing battery consumption by differentiating between primary and secondary notifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If scheduling information for warning messages is transmitted through Common Traffic Channels, then radio resources can be used efficiently, but terminals experience delays in receiving the scheduling information
Solution Approach 1:
The patent applies preliminary action by transmitting scheduling information for warning messages through the Broadcast Control Channel (BCCH) before the actual warning message is sent. This allows terminals to acquire the scheduling information in advance during their normal BCCH monitoring, eliminating the time delay that would occur if they had to wait for traffic channel transmissions. The scheduling information includes parameters such as resource allocation, modulation and coding scheme, and timing information needed to efficiently receive the subsequent warning message.
2Reliability
If terminals continuously monitor for warning messages, then they can receive warnings promptly, but battery power is consumed excessively
Solution Approach 1:
The patent implements periodic action by having terminals monitor the BCCH at regular intervals to acquire scheduling information for warning messages, rather than continuously monitoring for warnings. The terminal enters a low-power state between monitoring periods, significantly reducing battery consumption. When a warning message is scheduled, the terminal wakes up at the next BCCH monitoring occasion to acquire the scheduling information and then receives the warning message at the specified time, ensuring reliable reception without excessive power usage.
3Speed
If warning messages are transmitted immediately when needed, then timely notification is achieved, but radio resource availability may be compromised
Solution Approach 1:
The patent applies preliminary action by pre-scheduling warning messages through the BCCH with advance notification of transmission parameters. This allows the network to prepare and allocate radio resources in advance, ensuring that when the actual warning message transmission occurs, the necessary resources are already reserved and immediately available. This approach enables fast warning message delivery without compromising overall radio resource availability, as the scheduling information itself is transmitted using efficient BCCH resources.
Data Source
AI summary
Disclosed is a method of receiving a warning message in a wireless communication system. A terminal (UE) receives system information through a control channel such as a Broadcast Control Channel (BCCH), and receives a warning message through a downlink channel according to scheduling information related to the warning message included in the system information.