Wireless Discovery Message Transmission Reliability
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Solution Overview
Problem
Current wireless communication systems, particularly in public safety networks, face challenges in ensuring high reliability and coverage for Device-to-Device (D2D) operations due to limitations in transmitting discovery messages, which are crucial for direct communication between devices in proximity.
Innovation Solution
A method where a user equipment (UE) continually and repeatedly transmits a discovery message from its upper layer to the lower layer until a timer for the ProSe Application Code expires, increasing the probability of message reception by other terminals, thereby enhancing D2D operation reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a terminal transmits a discovery message in conventional wireless communication systems, then the message can be sent through the network infrastructure, but the reception probability is limited due to single transmission attempts and network coverage dependencies
Solution Approach 1:
The terminal performs periodic transmission of the discovery message at predetermined intervals without waiting for network scheduling. This periodic action ensures that the discovery message is transmitted multiple times over the validity period of the ProSe Application Code, significantly increasing the probability that at least one transmission will be successfully received by other terminals in the vicinity.
Solution Approach 2:
The discovery message transmission continues continuously from the upper layer to the lower layer until the timer for the ProSe Application Code expires. This continuous transmission ensures that the discovery process remains active throughout the entire validity period, maximizing the opportunity for successful discovery without interruption or dependency on network scheduling decisions.
2Reliability
If a terminal repeatedly transmits discovery messages to increase reception probability, then reliability improves, but energy consumption and transmission resources increase
Solution Approach 1:
The terminal receives the ProSe Application Code and its validity time in advance from the network, then pre-configures the transmission schedule based on this information. The timer is started when receiving the PAC, and the transmission continues until the timer expires after the time value. This preliminary configuration allows the terminal to plan its transmissions efficiently without continuous network coordination, reducing unnecessary energy consumption while ensuring coverage throughout the validity period.
3Reliability
If discovery messages are transmitted only when scheduled by the network, then network control is maintained, but direct communication reliability in public safety networks is compromised
Solution Approach 1:
The transmission control function is segmented into two parts: the network provides the ProSe Application Code and validity time (macro-level control), while the terminal autonomously manages the periodic transmission timing and continuation (micro-level execution). This segmentation allows the terminal to operate independently once configured, ensuring reliable direct communication without requiring continuous network involvement, which is critical for public safety applications where network infrastructure may not be available.
Data Source
AI summary
Provided are a method for transmitting a discovery message by a terminal in a wireless communication system, and a terminal using the same. The method comprises: receiving a discovery response (discovery_response) message including a proximity service application code (ProSe application code: PAC); passing a discovery message generated on the basis of the PAC from an upper layer to a lower layer of the terminal; and transmitting the discovery message at the lower layer, wherein the upper layer of the terminal continuously and repetitively passes the discovery message with respect to the PAC to the lower layer until a timer for the PAC expires.