ProSe Discovery Coordination via Base Station Mediator
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Solution Overview
Problem
Current wireless communications systems face challenges in proximity-based service (ProSe) discovery and communication, including power consumption issues, radio link quality, and interference from other UEs, due to lack of E-UTRAN coordination between ProSe-enabled devices in close proximity.
Innovation Solution
A method for ProSe discovery and communication involves a ProSe communication preparation procedure, where a base station transmits scheduled information to UEs and determines the feasibility of a direct radio link for ProSe communication, and a Mobility Management Entity (MME) establishes an Evolved Packet System (EPS) bearer by generating a correlation identification and requesting bearer setup for each UE, enabling direct communication between UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If ProSe-enabled UEs perform proximity discovery procedures without E-UTRAN coordination, then direct communication between UEs is enabled, but power consumption increases and radio link quality deteriorates
Solution Approach 1:
The base station acts as an intermediary that coordinates ProSe discovery procedures. It transmits configuration information to UEs and receives discovery messages, enabling direct UE communication while maintaining network control to optimize power consumption and radio link quality.
2Ease of operation
If ProSe-enabled UEs perform proximity discovery procedures without E-UTRAN coordination, then direct communication between UEs is enabled, but interference from other UEs increases
Solution Approach 1:
The base station serves as a mediator that manages resource allocation for ProSe discovery messages. By coordinating transmission resources and configuring UEs appropriately, it enables direct communication while minimizing interference to and from other UEs in the network.
3Measurement precision
If fine tracking on UEs' geographical locations is performed to improve ProSe discovery accuracy, then proximity detection precision is improved, but delay time increases due to location reporting requirements
Solution Approach 1:
The base station performs preliminary actions by maintaining and updating location information of UEs in its coverage area. When ProSe discovery is needed, this pre-collocated location data can be immediately used to determine proximity, avoiding the time delay of real-time location reporting and fine tracking procedures.
Data Source
AI summary
A method for handling Proximity-based Service (ProSe) discovery, comprising: performing a ProSe communication preparation procedure, in response to a received ProSe discovery request message, with a first UE and a second UE, for guiding ProSe discovery between the first UE and the second UE, wherein the received ProSe discovery request message indicates ProSe identifiers of the first UE and the second UE for ProSe communication and the ProSe communication preparation procedure comprises transmitting a first request message including scheduled information for the first UE and a second request message including scheduled information for the second UE, to the first UE and to the second UE respectively, and receiving response messages from the first and second UE; determining if a direct radio link between the first UE and the second UE is feasible for ProSe communication based on the received response messages from the first and second UE.