Cross-Carrier Scheduling and CSI-RS Configuration for D2D Coexistence
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Solution Overview
Problem
In 5G wireless communication systems, device-to-device (D2D) technology faces operational ambiguity issues, particularly in vehicle-to-everything (V2X) communication, due to simultaneous D2D and cellular uplink transmissions, and there is a need for improved configuration of Channel State Information Reference Signals (CSI-RS) and efficient scheduling information transmission in unlicensed bands.
Innovation Solution
A method for cross-carrier scheduling information transmission and reception is implemented, allowing terminals to receive cross-carrier scheduling from a base station, monitor physical downlink control channels, and transmit uplink data accordingly, while also configuring variable CSI-RS and using CSI-RS CDM-4 or CDM-8 mapping to support multiple CSI-RSs and enhance power boosting in mobile communication systems with array antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If D2D terminals use uplink resources for direct communication, then device-to-device communication capability is enabled, but operational ambiguity occurs when D2D transmission and cellular uplink transmission happen simultaneously
Solution Approach 1:
The patent segments uplink resources into D2D dedicated resources and cellular uplink resources, separating the transmission domains to eliminate operational ambiguity. By allocating specific time-frequency resources exclusively for D2D communication, the system prevents conflicts between D2D terminals and base station transmissions.
Solution Approach 2:
The patent introduces a mediator mechanism where the base station controls and coordinates resource allocation between D2D terminals and cellular uplink transmissions. The base station acts as an intermediary that manages scheduling conflicts and ensures clear separation of transmission operations.
2Stability of the object's composition
If traditional CSI-RS configuration is used, then existing communication protocols are maintained, but the system cannot support advanced array antenna techniques and beamforming in 5G
Solution Approach 1:
The patent dynamically configures CSI-RS based on the number of active array antennas, allowing the reference signal configuration to adapt to different antenna setups. The system can flexibly adjust CSI-RS parameters according to whether 2D or 3D array antennas are deployed, enabling support for advanced 5G techniques while maintaining backward compatibility.
Solution Approach 2:
The patent creates a universal CSI-RS configuration mechanism that serves multiple functions: supporting traditional 2D array antennas, enabling advanced 3D array antennas, facilitating beamforming operations, and maintaining compatibility with existing 4G protocols. This multi-functional approach allows a single reference signal system to handle diverse antenna configurations.
3Adaptability or versatility
If additional carriers are added to support LTE and 5G coexistence, then both systems can operate simultaneously, but system complexity and resource consumption increase
Solution Approach 1:
The patent merges LTE and 5G operations onto a single carrier frequency, eliminating the need for separate carriers for each system. By combining both technologies in a unified carrier configuration, the system reduces complexity while maintaining the ability to support both LTE and 5G communications simultaneously.
Solution Approach 2:
The patent dynamically selects and switches between LTE and 5G transmission modes based on channel conditions and system requirements. The base station can flexibly transition between different communication protocols and antenna configurations, allowing adaptive operation without requiring multiple dedicated carriers.
Data Source
AI summary
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The present disclosure provides a method and an apparatus for coexistence of device-to-device communications and cellular communications in a mobile communications system.