Base Station D2D Resource Allocation via RSRP Thresholds
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Solution Overview
Problem
In a wireless communication system integrating device-to-device (D2D) and cellular technologies, the in-band emission power from D2D signals acts as noise in cellular signal transmission, leading to system throughput degradation.
Innovation Solution
A method and apparatus for a base station to multiplex D2D and cellular communication resources, using reference signal received power (RSRP) thresholds to differentiate and manage D2D terminal groups, thereby minimizing interference and optimizing resource allocation to reduce noise impact on cellular signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If D2D and cellular communication resources are multiplexed in the same frequency band, then resource utilization efficiency is improved, but in-band emission power from D2D signals acts as noise in cellular signal transmission causing system throughput degradation
Solution Approach 1:
The patent segments D2D resources into two distinct groups: first D2D resources for terminals with RSRP greater than a threshold, and second D2D resources for terminals with RSRP less than the threshold. This segmentation allows different resource allocation strategies for different terminal locations, reducing in-band emission interference to cellular signals while maintaining resource utilization efficiency.
Solution Approach 2:
The patent applies local quality by configuring different resource allocation parameters (first D2D resources vs. second D2D resources) based on the local conditions of terminal locations. Terminals closer to the base station (higher RSRP) use first D2D resources, while terminals farther away (lower RSRP) use second D2D resources, optimizing interference management locally for each terminal group.
2Reliability
If D2D signal transmission power is increased to improve D2D communication quality, then D2D signal quality is improved, but in-band emission power increases causing greater noise in cellular signal transmission
Solution Approach 1:
The patent changes the resource allocation parameters (assigning different resource sets) based on the RSRP parameter of terminals. By monitoring RSRP and dynamically assigning terminals to appropriate D2D resource groups, the system optimizes D2D transmission quality while controlling in-band emission power through intelligent resource selection rather than simply increasing transmission power.
3Object-generated harmful factors
If separate frequency bands are used for D2D and cellular communications to avoid interference, then in-band emission noise is eliminated, but resource utilization efficiency decreases due to spectrum fragmentation
Solution Approach 1:
The patent introduces RSRP threshold-based resource group configuration as an intermediary mechanism between D2D and cellular communications. This intermediary approach allows both D2D and cellular signals to share the same frequency band while the RSRP-based segmentation acts as a mediator to manage and reduce in-band emission interference, achieving a balance between interference reduction and resource utilization.
Data Source
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AI summary
The present disclosure relates to a communication technique for converging, with an IoT technology, a 5G communication system for supporting a higher data transmission rate than a 4G system, and a system therefor. The present disclosure may be applied to intelligent services, such as smart homes, smart buildings, smart cities, smart cars or connected cars, health care, digital education, retail businesses, and security and safety related services, on the basis of 5G communications technologies and IoT-related technologies. The purpose of the present invention is to solve the problem of discharged electrical power in a band caused by a D2D signal transmission adding noise to cellular signal transmission. The present invention may comprise: transmitting downlink data to a terminal from a base station; receiving positive reception acknowledgement (ACK) or negative reception acknowledgement (NACK) information on a physical uplink control channel (PUCCH) according to the results of receiving the downlink data; determining whether an uplink resource where the ACK or NACK information is received is included in a first resource or a second resource; and interpreting, in particular by the base station, the ACK or NACK information as ACK if the uplink resource where the ACK or NACK information is received is included in the first resource.