Inter-UE Direct Communication via Base Station Sequence Synchronization
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Solution Overview
Problem
Current wireless communication systems, such as LTE, face challenges in reducing latency and optimizing radio resource usage due to the need for data to pass through base stations for user equipment (UE) communication, which limits efficiency and increases power consumption.
Innovation Solution
A method and apparatus for inter-UE direct communication, where user equipment can request and establish direct communication with counterpart UE without relying on base stations, using sequence information for time synchronization and detection, and exchanging this information through base stations via backhaul links when UEs are in different cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data transmission passes through base stations for UE communication, then network control and management are improved, but latency increases and radio resources are wasted
Solution Approach 1:
The communication path is segmented into two types: control plane traffic continues to route through base stations for network management, while user plane traffic is routed directly between UEs. This segmentation allows simultaneous optimization of both network control reliability and transmission latency by separating control functions from data transmission functions.
Solution Approach 2:
The base station acts as an intermediary that facilitates direct UE-to-UE communication by exchanging sequence information through backhaul links, enabling UEs to establish direct communication channels while the base station maintains oversight for network control purposes.
2Reliability
If data transmission passes through base stations for UE communication, then network management is improved, but radio resource usage efficiency deteriorates
Solution Approach 1:
By segmenting control plane and user plane transmissions, the patent allows radio resources to be used more efficiently for direct UE communication while base stations continue to manage network resources through control signaling, thereby improving overall radio resource utilization efficiency.
3Loss of time
If direct UE-to-UE communication is established, then latency is reduced and radio resources are conserved, but time synchronization between UEs becomes more difficult
Solution Approach 1:
The base station performs preliminary actions by pre-calculating and exchanging sequence information (including synchronization sequences and timing advance values) between UEs through backhaul links before direct communication begins. This preliminary provisioning of synchronization parameters enables UEs to achieve time synchronization without continuous base station intervention, reducing latency while maintaining synchronization accuracy.
4Use of energy by moving object
If direct UE-to-UE communication is established, then power consumption is reduced, but communication reliability between UEs in different cells deteriorates
Solution Approach 1:
The base station serves as a mediator that exchanges sequence information and synchronization parameters between UEs in different cells through backhaul links. This intermediary role ensures that even UEs in different cells can establish reliable direct communication by receiving pre-configured synchronization information, maintaining communication reliability while reducing power consumption compared to base station-mediated transmission.
Data Source
AI summary
Disclosed in the present application is a method in which a user equipment (UE) performs inter-UE direct communication in a wireless communication system. More particularly, the method includes the steps of: transmitting a request message to an eNodeB for direct communication with a UE of another party; receiving sequence information from the eNodeB for time synchronization with the UE of the other party; detecting a transmission sequence to be made from the UE of the other party, using the sequence information; and performing the inter-UE communication with the UE Of the other party.