ProSe-PGW IP Session Continuity in D2D Communication
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Solution Overview
Problem
Existing communication systems face challenges in providing seamless Internet Protocol (IP) session continuity when User Equipments (UEs) switch from direct communication paths to wireless communication networks or vice versa, leading to disruptions in IP packet transmission due to invalid local IP addresses.
Innovation Solution
The implementation of Proximity-based Service (ProSe) Evolved Packet System (EPS) bearers, which allow UEs to establish and manage EPS bearers directly with a ProSe Packet Data Network (PDN) Gateway, enabling seamless IP packet transmission by mapping and filtering IP addresses, thereby maintaining continuous communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UEs use direct communication paths for D2D communication, then communication efficiency is improved, but IP session continuity is disrupted when switching to wireless network
Solution Approach 1:
The patent introduces a ProSe-PGW as an intermediary node that mediates between direct D2D communication and wireless network communication. The ProSe-PGW maintains IP session continuity by acting as a gateway that translates and routes packets between the two communication modes, allowing seamless transition without IP address changes.
Solution Approach 2:
The patent implements preliminary establishment of EPS bearers before actual communication occurs. By pre-configuring the ProSe-PGW with bearer information and IP address mappings, the system prepares the infrastructure in advance, enabling rapid and seamless switching between direct and network-based communication without disruption.
2Adaptability or versatility
If UEs switch from direct communication to wireless network communication, then network coverage is improved, but IP packet transmission is disrupted due to invalid local IP addresses
Solution Approach 1:
The patent changes the IP address parameter from local D2D addresses to public IP addresses assigned by the ProSe-PGW. This parameter transformation enables UEs to maintain connectivity when switching to wireless network communication, as the ProSe-PGW translates between the two address types and updates routing information accordingly.
Solution Approach 2:
The ProSe-PGW serves as an intermediary that resolves the IP address invalidity issue by translating local D2D addresses to public IP addresses. It acts as a bridge that understands both addressing schemes and ensures packets are correctly routed regardless of whether direct or network-based communication is active.
3Productivity
If traditional EPS bearers are used for D2D communication, then network infrastructure utilization is improved, but tunneling overhead increases
Solution Approach 1:
The patent extracts the D2D communication function from the traditional EPS bearer infrastructure. By introducing a dedicated ProSe-PGW with specialized D2D bearers, the system separates direct communication traffic from conventional network traffic, eliminating unnecessary tunneling and reducing overhead while maintaining infrastructure utilization benefits.
Data Source
AI summary
A method for performing, by a User Equipment (UE), Device-to-Device (D2D) communication using a wireless communication network is provided. The method includes performing D2D communication via a direct communication path using an allocated Internet Protocol (IP) address, establishing a first Evolved Packet System (EPS) bearer supporting D2D communication via the wireless communication network, to a Packet Data Network (PDN) Gateway (P-GW), determining to switch from the direct communication path to D2D communication via the wireless communication network, and communicating an IP packet through the first EPS bearer based on the determination. An IP packet transmitted through the first EPS bearer may not be transmitted to a packet data network, or an IP packet received through the first EPS bearer is not received from the packet data network.