D2D Communication Handover Timing Coordination
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Solution Overview
Problem
In wireless communication networks, handling Device-to-Device (D2D) communication during handover of wireless devices between cells is challenging due to the need for efficient resource allocation and interference management, especially when network control is split between two network nodes.
Innovation Solution
Wireless devices provide uplink timing differences to network nodes during handover, allowing these nodes to determine a scheduling scheme that avoids collisions by coordinating time locations for D2D communication, ensuring seamless transition and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If D2D communication is maintained during handover without interruption, then communication continuity is improved, but resource allocation conflicts and interference increase due to split network control
Solution Approach 1:
The patent applies preliminary action by having the wireless device determine uplink timing differences and provide this information to network nodes before the handover is completed. This allows the network nodes to pre-calculate appropriate scheduling schemes that avoid collisions, ensuring smooth transition without interruption to D2D communication.
Solution Approach 2:
The patent uses uplink timing difference information as an intermediary parameter that enables coordination between source and target network nodes. This timing difference serves as a mediator that allows both network nodes to understand their relative timing relationships and establish a collision-free scheduling scheme for D2D communication during handover.
2Adaptability or versatility
If network control of D2D communication is split between two network nodes during handover, then handover flexibility is improved, but scheduling coordination complexity increases
Solution Approach 1:
The patent applies parameter changes by using uplink timing difference as a key parameter to simplify the scheduling coordination problem. By transforming the complex coordination task into a timing-based parameter adjustment, the system achieves flexible handover while reducing scheduling coordination complexity through mathematical relationship establishment between timing parameters.
3Productivity
If D2D communication uses cellular uplink resources with TDD scheme, then resource efficiency is improved, but timing synchronization requirements increase during handover
Solution Approach 1:
The patent applies feedback by having the wireless device measure and report uplink timing differences to network nodes during handover. This feedback mechanism enables the network nodes to adjust scheduling parameters dynamically, maintaining timing synchronization accuracy while preserving the resource efficiency benefits of TDD-based D2D communication.
Data Source
AI summary
A method performed by a first wireless device for handling a device-to-device (D2D) communication with a second wireless device during handover of the first wireless device from a source network node to a target network node in a wireless telecommunications network is provided. The first wireless device interrupts the D2D communication. Then, the first wireless device determines a first uplink timing difference as the difference between the uplink timing to the source network node and the uplink timing to the target network node. Further, the first wireless device reconfigures the D2D communication based on the first uplink timing difference. Then, the first wireless device restarts the D2D communication as reconfigured. A first wireless device is also provided, along with a target network node, a source network node and methods therein for handling a D2D communication.