D2D Indication via NAS Messages in LTE
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Solution Overview
Problem
Current wireless communication systems, particularly 3GPP LTE, lack efficient methods for indicating device-to-device (D2D) related information, such as service type and quality of service characteristics, which is crucial for efficient D2D operation and meeting stringent public safety network requirements.
Innovation Solution
A method and apparatus for indicating D2D related information, including service type and QoS characteristics, to the network by transmitting this information via NAS messages, such as tracking area update or service request messages, allowing the network to schedule D2D transmissions and receptions effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If D2D operation is implemented in LTE network, then direct communication capability is improved, but network complexity increases due to additional signaling requirements
Solution Approach 1:
The patent combines D2D indication information with existing NAS messages (tracking area update, service request, etc.) that are already transmitted between UE and network. By merging the D2D indication into these existing signaling messages, the patent enables direct communication capability without requiring separate dedicated signaling procedures, thus reducing overall network signaling complexity while maintaining adaptability.
Solution Approach 2:
The patent makes existing NAS messages serve multiple functions: their original purpose plus carrying D2D indication information. This multi-functionality allows the network to obtain D2D capability indicators without adding new message types, thereby improving direct communication capability while avoiding increased signaling overhead.
2Measurement precision
If D2D related information is transmitted via dedicated signaling, then information accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent merges D2D indication information with existing NAS messages that are already required for network operations. This combination ensures accurate transmission of D2D information while avoiding the need for separate dedicated signaling messages, thereby maintaining information accuracy without increasing signaling overhead.
Solution Approach 2:
Existing NAS messages are made multi-functional by incorporating D2D indication capabilities. This allows the same signaling infrastructure to serve both original purposes and D2D information transmission, ensuring accurate information delivery while minimizing additional signaling overhead.
3Reliability
If D2D configuration details are provided to network, then service quality is improved, but message size increases
Solution Approach 1:
The patent extracts only the essential D2D indication information (such as D2D capability status, service type indicators) and embeds them within existing NAS messages. By selecting only the most critical configuration details rather than transmitting complete D2D parameter sets, the patent improves service quality through adequate network awareness while minimizing the increase in message size.
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AI summary
A method and apparatus for indicating device-to-device (D2D) related information in a wireless communication system is provided. A user equipment (UE) indicates at least one of a service type of a D2D operation, quality of service (QoS) characteristics of the D2D operation or a D2D configuration to a network.