Source ID Packet Filtering in D2D Relay UEs
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Solution Overview
Problem
Current public safety networks face challenges in providing reliable and secure direct communication services, especially when devices are out of cellular coverage, due to backward compatibility issues and high costs, necessitating improved D2D operation methods for enhanced signal transmission and reception.
Innovation Solution
A D2D operation method where a relay UE receives data from a remote UE, filters packets based on source IDs, and relays filtered data, establishing relay links for 1-to-many or 1-to-one data transmission, with white and black lists managing data transmission to specific groups or individual UEs, improving network coverage and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If packet filtering is performed based on source ID in D2D relay operation, then data transfer efficiency is improved and network coverage is extended, but device complexity increases due to additional filtering mechanisms
Solution Approach 1:
The network pre-configures filter criteria (white lists, black lists, source ID filters) in the relay UE before data transmission begins. This preliminary configuration allows the relay UE to efficiently filter packets using pre-established rules without complex real-time decision-making, thereby improving data transfer efficiency while keeping the filtering mechanism relatively simple.
Solution Approach 2:
The patent introduces white lists and black lists as intermediary filtering mechanisms. These lists act as intermediate layers between raw packet filtering and complex source ID analysis, allowing the system to quickly discard irrelevant traffic (black list) or prioritize important traffic (white list) before applying more sophisticated source ID-based filtering, thus improving overall efficiency without proportionally increasing complexity.
2Area of stationary object
If relay links are established for 1-to-many data transmission, then network coverage is extended to multiple UEs, but device complexity increases due to group management requirements
Solution Approach 1:
The relay UE is designed with multi-functional capabilities to handle both 1-to-1 and 1-to-many relay operations using a unified architecture. The same filtering and relaying mechanisms are applied regardless of whether the destination is a single UE or multiple UEs in a group, thereby extending network coverage without proportionally increasing device complexity through specialized hardware or protocols for each mode.
Solution Approach 2:
Group IDs and group membership information are pre-configured in the relay UE before 1-to-many transmission begins. The network provides advance notification of which UEs belong to which groups, allowing the relay UE to prepare filtering rules in advance. This preliminary setup enables efficient multi-UE coverage without requiring complex real-time group management during active transmission.
3Reliability
If white lists and black lists are used for packet filtering, then data security and reliability are improved, but loss of time occurs due to additional filtering processing
Solution Approach 1:
The packet filtering process is segmented into multiple hierarchical stages: first black list filtering (quick rejection of unwanted traffic), then white list filtering (prioritization of important traffic), and finally source ID-based filtering (precise routing decisions). This segmentation allows the system to quickly handle the majority of packets through simple list checks while applying more time-consuming filtering only to relevant traffic, thereby improving reliability without excessive time loss.
Solution Approach 2:
The system applies partial filtering actions to all packets (black/white list checks) and excessive filtering actions only to necessary packets (detailed source ID verification). Not every packet requires the full filtering sequence - packets matching black list criteria are quickly discarded without further processing, while only packets requiring delivery undergo complete verification. This selective application of filtering depth improves reliability for critical packets while minimizing overall processing time.
Data Source
AI summary
The present invention provides a device-to-device (D2D) operation method performed by a relay terminal in a wireless communication system, the D2D operation method receiving data from a remote terminal, wherein the data includes a source ID of the data, filtering a packet of the data, and relaying the filtered data to a network, wherein the data is filtered on the basis of the source ID of the data.