LTE D2D Terminal Power Control via Pre-configured Ranges
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Solution Overview
Problem
Existing processes for device-to-device (D2D) communication in LTE systems have not been adequately addressed, particularly in terms of efficiently performing D2D discovery and communication, with insufficient consideration for terminal device capabilities and network configuration.
Innovation Solution
A terminal device and base station configuration that includes a reception unit for system information blocks and a transmission unit for physical sidelink discovery channels, with transmit power determined by maximum output power parameters, and an authorized range defined for each public land mobile network, prioritizing subscriber identity module storage for D2D operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transmit power for physical sidelink discovery channel is determined by maximum output power parameters from system information block, then D2D discovery efficiency is improved, but device complexity increases due to multiple parameter considerations and authorized range determinations
Solution Approach 1:
The network pre-configures maximum output power parameters and authorized ranges in system information blocks before D2D operations. The terminal device receives and stores these parameters in advance, eliminating the need for complex real-time calculations during D2D discovery. This preliminary configuration simplifies the terminal device's processing while maintaining efficient D2D discovery performance.
2Reliability
If authorized range is defined for each public land mobile network with SIM card priority, then network security and authorization control are improved, but device complexity increases due to multiple storage locations and priority management
Solution Approach 1:
Authorized ranges are pre-configured in multiple locations (network, terminal, SIM card) before operation. The SIM card stores authorized ranges in advance, and the terminal device follows a predetermined priority rule (SIM > terminal > network) when conflicts occur. This preliminary setup simplifies real-time authorization management while ensuring reliable network security control.
3Reliability
If multiple parameters from system information block are considered for transmit power determination, then D2D communication reliability is improved, but transmission time increases due to comprehensive parameter evaluation
Solution Approach 1:
The network provides multiple power-related parameters (maximum output power, P-Max, authorized ranges) in system information blocks in advance. The terminal device stores these parameters and uses predetermined selection rules during D2D operations, avoiding time-consuming real-time evaluations while ensuring reliable power determination for consistent D2D communication.
Data Source
AI summary
A terminal device configured to perform D2D transmission by a higher layer includes: a reception unit receiving from a base station device one or a plurality of first parameters relating to transmit power and receiving a second parameter for configuring a first transmission resource from the base station device; and a transmission unit performing, upon receipt of the second parameter in an RRC idle state, the D2D transmission using the first transmission resource with the transmit power in accordance with a first parameter corresponding to an authorized range among the one or plurality of first parameters.