Proximity Discovery Using Temporary UE IDs
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Solution Overview
Problem
In cellular wireless communication systems, devices struggle to efficiently communicate directly with each other in close proximity, leading to service interruptions and increased power consumption, as they rely on network routing rather than direct inter-device communication links.
Innovation Solution
Implementing methods and devices for proximity discovery in cellular wireless communication systems, allowing user equipment (UEs) to establish direct inter-device communication links using the same cellular radio access technology, thereby enabling direct communication without routing through base stations and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs communicate directly using another RAT (WLAN or Bluetooth), then direct communication is enabled, but service interruption and dropped calls occur due to handover requirements
Solution Approach 1:
The patent enables UEs to perform proximity discovery and direct communication using the same cellular RAT for both uplink and downlink, eliminating the need for multi-RAT capabilities. The base station coordinates D2D communication resources within the cellular network framework, allowing a single RAT to fulfill multiple communication functions including both traditional network communication and direct device-to-device communication.
Solution Approach 2:
The base station acts as an intermediary that coordinates and manages D2D communication resources. It allocates uplink resources for proximity discovery signals and downlink resources for discovery responses, maintaining service continuity through centralized control while enabling direct UE communication without handover to other RATs.
2Productivity
If UEs route data through base station and EPC network, then network control and policy enforcement are maintained, but spectral efficiency decreases and power consumption increases
Solution Approach 1:
The patent extracts the data transmission path from the traditional network route (UE-BASE STATION-EPC-NETWORK) and creates a direct UE-to-UE communication path for proximity services. The base station only maintains control signaling while data packets are transmitted directly between UEs, eliminating unnecessary routing through the EPC network and improving spectral efficiency.
Solution Approach 2:
The communication path is segmented into control plane (through base station for resource allocation and discovery coordination) and user plane (direct UE-to-UE for data transmission). This segmentation allows network control to be maintained while enabling efficient direct data transmission that reduces power consumption and improves spectral efficiency.
3Ease of operation
If handover from cellular technology to another RAT is performed, then direct communication capability is achieved, but service interruption occurs
Solution Approach 1:
The cellular RAT is made universal to handle both traditional network communication and direct device-to-device communication. The same uplink and downlink cellular resources are used for proximity discovery and direct data transmission, eliminating the need to switch to other RATs and preventing service interruption.
Solution Approach 2:
The base station serves as a mediator that manages the transition from network-routed communication to direct D2D communication within the same cellular RAT. It coordinates resource allocation, manages discovery signal transmission, and maintains connection continuity, ensuring seamless operation without handover-induced service interruptions.
Data Source
AI summary
A method for use in a first user equipment (UE) includes receiving, from a base station, control information and a resource assignment for uplink transmission; and transmitting, based on the control information, a discovery signal on the assigned resource for uplink transmission, the discovery signal including a first temporary UE identifier (ID) assigned to the first UE, wherein the first temporary UE ID is used to identify the first UE for device-to-device communication.