Variable-Size Discovery Message Transmission via Data Channel
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G networks, face limitations in transmitting discovery messages of varying sizes through physical sidelink discovery channels, which are unsuitable for inter-vehicle communication and public safety messages, as they can only transmit fixed-size messages and are unavailable for periodic transmissions.
Innovation Solution
The method involves transmitting discovery messages through a data channel, such as the physical sidelink shared channel, by requesting and allocating resources from a base station, allowing for variable message sizes and distinct processing of messages and data on the same channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If discovery messages are transmitted through the physical sidelink discovery channel (PSDCH), then discovery messages can be transmitted with fixed size, but the channel is unavailable for variable size messages and periodic transmissions
Solution Approach 1:
The patent applies multi-functionality by enabling the physical sidelink shared channel (PSSCH) to serve dual purposes: transmitting both data and discovery messages. This resolves the contradiction by making the channel versatile enough to handle variable-size discovery messages while maintaining efficient resource utilization through unified physical channel usage.
Solution Approach 2:
The patent implements dynamics by introducing dynamic resource allocation and message type identification mechanisms. The base station dynamically allocates resources for discovery messages based on their variable sizes, and the system dynamically identifies message types using indicator fields, allowing the channel to adapt flexibly between data and discovery message transmissions.
2Productivity
If discovery messages and data are transmitted through the same data channel, then resource allocation efficiency is improved, but message detection and distinction becomes more difficult
Solution Approach 1:
The patent applies the color changes principle by using different indicator values to distinguish message types. Specifically, the discovery message indicator field acts as a 'color' marker that changes between values (e.g., first value for discovery messages, second value for data), enabling the receiving device to easily detect and differentiate message types despite transmission through the same physical channel.
Solution Approach 2:
The patent introduces an intermediary mechanism in the form of a discovery message indicator field and resource allocation patterns. This intermediary element mediates between the unified channel transmission and the need for distinct message identification, allowing both data and discovery messages to share the channel while maintaining clear detectability through the indicator signal.
3Adaptability or versatility
If the physical sidelink discovery channel is used for discovery messages, then discovery functionality is provided, but the channel cannot support inter-vehicle communication or public safety messages requiring periodic transmission
Solution Approach 1:
The patent applies multi-functionality by transforming the dedicated discovery channel into a universal channel that supports multiple communication types including discovery messages, inter-vehicle communication, and public safety messages. The physical sidelink shared channel is configured to handle periodic transmissions for various applications, eliminating the need for separate dedicated channels and reducing transmission delays.
Data Source
AI summary
The present invention relates not only to a 4th-generation (4G) communication system such as long term evolution (LTE) but also to a 5th-generation (5G) or pre-5G communication system to be provided to support a higher data transmission rate. According to the present invention, a first user equipment (UE) is configured to transmit, to a base station, a request message comprising information indicating that a discovery message is to be transmitted through a data channel and information on the amount of data related to the discovery message, receive, from the base station, a control message comprising information on a resource allocated to transmit the discovery message and information indicating that the control message comprises information for the transmission of the discovery message, and transmits the discovery message to a second UE through the data channel based on the control message.