D2D Communication Link Resource Reuse and Interference Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems, such as 3GPP LTE, face challenges in efficiently performing device-to-device (D2D) communication, particularly in reducing costs per bit, increasing service availability, and managing flexible frequency band use while maintaining reasonable power consumption and a simple structure with open interfaces.
Innovation Solution
A method and apparatus for D2D communication in a wireless communication system, where a user equipment (UE) performs D2D communication using a half-duplex approach, reusing uplink resources to avoid interference and implementing a carrier aggregation scheme to manage communication links with an eNB and other UEs, allowing for efficient signal reception and processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If D2D communication is implemented in LTE system, then service availability and user experience are improved, but implementation cost and system complexity increase
Solution Approach 1:
The patent applies universality by enabling the UE to perform multiple communication functions (D2D communication and traditional network communication) using the same hardware resources. The UE can switch between communicating with the eNB and communicating directly with other UEs, making the device multi-functional without requiring separate dedicated hardware for each mode, thereby reducing implementation cost while maintaining service availability
Solution Approach 2:
The patent implements dynamics through the half-duplex communication approach where the UE dynamically switches between different communication modes (D2D and network communication) based on operational requirements. This dynamic resource allocation allows the system to adapt to different service needs while optimizing the use of limited hardware resources, reducing overall system complexity
2Device complexity
If UE uses single reception circuit for both eNB and D2D signals, then device complexity is reduced, but signal reception reliability deteriorates due to interference
Solution Approach 1:
The patent applies periodic action through time-division multiplexing where the single reception circuit alternates between receiving D2D signals and receiving eNB signals in different time slots. This periodic switching prevents simultaneous reception of both signals, eliminating self-interference and ensuring reliable signal reception in each mode while maintaining a simple single-circuit structure
Solution Approach 2:
The patent extracts the conflicting function of receiving both D2D and eNB signals simultaneously from the single reception circuit. By separating the reception operations into distinct time periods, the patent removes the interference problem that would arise from attempting to perform both functions concurrently, thereby maintaining both structural simplicity and reception reliability
3Productivity
If UE performs D2D communication, then direct communication efficiency is improved, but power consumption increases
Solution Approach 1:
The patent applies self-service by enabling UEs to perform D2D communication directly without requiring network infrastructure assistance for the actual data transmission. Once the communication is established, the UEs serve each other directly, eliminating the need for eNB to relay data, which reduces overall system power consumption while maintaining high communication efficiency between the participating UEs
Solution Approach 2:
The patent implements partial action by using the single reception circuit for D2D communication only during specific time slots when D2D traffic is active, rather than continuously. This partial utilization of the circuit for D2D purposes (as opposed to continuous operation) reduces power consumption while still achieving efficient direct communication when needed
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3
AI summary
The present application discloses a method of performing, by a terminal, direct communication between terminals in a wireless communication system to which a carrier wave aggregating technique is applied. In particular, the method includes: reporting, to a base station, performance information on a terminal including information on a limited frequency band; and performing direct communication between the terminal and an opposite terminal through a specific frequency band, wherein if the specific frequency band is the same as the limited frequency band, signal reception from the base station when performing direct communication between the terminals is limited.