D2D Terminal Reference Carrier Timing Synchronization
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Solution Overview
Problem
In wireless communication systems, device-to-device (D2D) operations face inefficiencies due to the need for time synchronization and downlink measurement across multiple carriers, leading to increased computational load and reduced radio communication efficiency.
Innovation Solution
A method where a terminal configures a reference carrier for D2D operation, performing time synchronization and downlink measurement only on this reference carrier, and determines timing advance information based on another carrier, thereby reducing computational load and improving power allocation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the terminal performs time synchronization and downlink measurement for each carrier in carrier aggregation, then D2D transmission can be carried out on multiple carriers, but the terminal computation amount is excessively increased and radio communication efficiency is deteriorated
Solution Approach 1:
The patent extracts the time synchronization and downlink measurement operations from each individual carrier and consolidates them to be performed only on the primary carrier. This eliminates redundant synchronization and measurement processes on secondary carriers, thereby reducing terminal computation amount while maintaining D2D transmission capability on multiple carriers through carrier aggregation.
Solution Approach 2:
The primary carrier is configured to serve multiple functions: it acts as both the D2D transmission carrier and the reference carrier for time synchronization and downlink measurement. This multi-functionality allows the terminal to perform synchronization and measurement once on the primary carrier, and then apply these parameters to D2D transmissions on aggregated carriers, reducing overall computational load.
2Measurement precision
If the terminal performs time synchronization and downlink measurement for each carrier, then accurate timing can be maintained on each carrier, but radio communication efficiency is deteriorated due to increased computational load
Solution Approach 1:
The patent separates the timing accuracy requirement from the measurement process by performing downlink measurement only on the primary carrier to obtain timing parameters, then applying these parameters to D2D transmission on aggregated carriers. This extraction approach maintains timing accuracy while avoiding redundant measurements on each carrier, thereby improving radio communication efficiency.
Solution Approach 2:
The terminal performs time synchronization and downlink measurement in advance on the primary carrier before D2D transmission. The obtained timing parameters are then reused for D2D transmission on aggregated carriers, eliminating the need for repeated measurements and improving overall communication efficiency while maintaining timing accuracy.
3Ease of manufacture
If D2D transmission is performed in respective carrier units in carrier aggregation, then proper resource allocation can be achieved, but power allocation efficiency is reduced due to multiple synchronization operations
Solution Approach 1:
The patent merges the synchronization and measurement operations across multiple carriers into a single operation on the primary carrier. The timing parameters obtained from the primary carrier are then applied to D2D transmission on all aggregated carriers, reducing the number of synchronization operations and improving power allocation efficiency while maintaining proper resource allocation through carrier aggregation.
Data Source
AI summary
The present invention provides a method for device-to-device (D2D) operation performed by a terminal in a wireless communication system, the method comprising the steps of: setting, as a second carrier, a timing reference of a first carrier on which D2D transmission is performed; determining D2D transmission timing advance (TA) information to be applied to the first carrier; and performing D2D transmission on the first carrier on the basis of the timing reference and the TA information.