Base Station Emergency Alert Indicator for Power-Saving Subordinate Stations
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Solution Overview
Problem
Base stations (BS) face inefficiencies in transmitting emergency information to subordinate stations (SS) in power-saving states, leading to unnecessary network resource waste, as SS in such states cannot receive emergency alerts, requiring retransmission upon resuming active state.
Innovation Solution
The BS generates an emergency alert indicator and allocates it into a broadcast/multicast channel, allowing SS in power-saving states to decode and respond to emergency information by establishing an emergency service flow through a handshake protocol.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the SS enters a power-saving state to extend battery life, then power utilization efficiency is improved, but the SS cannot receive emergency information, leading to network resource waste due to retransmission
Solution Approach 1:
The system performs preliminary action by embedding an emergency alert indicator in the broadcast/multicast channel preamble that can be detected by SS in power-saving state before they fully wake up. This allows the system to prepare and notify SS about emergency information availability in advance, enabling SS to wake up selectively only when emergency information is present, thereby avoiding unnecessary wake-ups and network resource waste from retransmissions
2Reliability
If the BS retransmits emergency information when SS resumes active state, then the SS can receive the emergency information, but network resources are wasted due to unnecessary retransmission
Solution Approach 1:
The system implements feedback by having SS check for the emergency alert indicator in the broadcast/multicast channel preamble upon waking up from power-saving state. Based on this feedback, SS can determine whether emergency information is available and take appropriate actions (such as sending a wake-up message to BS or directly receiving emergency information), thereby eliminating the need for BS to retransmit emergency information and improving network resource utilization
3Reliability
If the emergency alert indicator is embedded in the broadcast/multicast channel preamble, then SS in power-saving state can detect emergency information, but the system complexity increases
Solution Approach 1:
The system applies universality by using the existing broadcast/multicast channel preamble structure for dual purposes: its original function and as a carrier for the emergency alert indicator. This multi-functional use of the preamble avoids creating entirely new signaling mechanisms, thereby limiting the increase in system complexity while still enabling SS in power-saving state to detect emergency information reliably
Data Source
AI summary
A base station (BS), a subordinate station (SS) and emergency information transmission methods thereof are provided. The SS is in a power-saving state. The BS shall allocate an emergency alert indicator and emergency information in a transmission channel. The SS in the power-saving state receives the emergency information according to the emergency alert indicator and proceeds with a handshake protocol with the BS to establish an emergency service flow between the BS and the SS.