eNB Centralized Resource Reuse for D2D Cellular Interference
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Solution Overview
Problem
In device-to-device (D2D) communication, existing reuse-mode D2D methods lack centralized control, leading to opportunistic and unreliable service availability, resource contention, and inability for the eNB to manage or charge for D2D communications due to independent resource selection by D2D pairs.
Innovation Solution
Implementing a centralized control mechanism where the eNB determines reusable resources based on priority requests, notifies D2D pairs of available resources, and manages resource allocation to avoid contention and ensure service availability, using a 'D2D-reusable UE list' message for resource coordination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If distributed reuse-mode D2D is implemented where each D2D pair independently decides resource reuse, then device complexity is reduced and ease of operation is improved, but service availability becomes opportunistic and unreliable, and resource contention occurs
Solution Approach 1:
The eNB acts as an intermediary between D2D pairs and cellular UEs. It receives reuse requests from D2D pairs, evaluates resource availability by monitoring cellular UE scheduling, and grants permission for resource reuse. This centralized mediation ensures reliable service availability while maintaining operational simplicity for D2D devices.
Solution Approach 2:
The system performs preliminary resource evaluation and grant decisions before D2D communication begins. The eNB proactively identifies suitable cellular resources for reuse, pre-approves D2D pairs, and establishes reuse permissions in advance, ensuring service availability is guaranteed rather than opportunistic.
2Reliability
If centralized control is implemented where eNB manages D2D resource reuse, then service availability and reliability are improved, but device complexity and system complexity increase
Solution Approach 1:
D2D pairs autonomously monitor cellular scheduling information, identify suitable resources from eNB-granted lists, and initiate communications without continuous eNB intervention. This self-service approach maintains reliability through centralized grants while reducing operational complexity for D2D devices.
Solution Approach 2:
The eNB serves as a centralized mediator that simplifies the system by handling complex resource evaluation, cellular scheduling monitoring, and conflict resolution. This concentrates complexity in the network infrastructure rather than distributed devices, improving overall system manageability.
3Object-affected harmful factors
If RTS/CTS handshake mechanism is used for resource coordination between D2D pairs, then resource contention is reduced, but message transmission becomes complex and setup time increases due to inability to reuse cellular resources
Solution Approach 1:
The patent extracts the resource coordination function from the D2D pair interaction and transfers it to the eNB. Instead of D2D pairs performing complex RTS/CTS handshakes, the eNB centralizes coordination by monitoring cellular schedules and granting reuse permissions directly, eliminating setup delays and message transmission complexity.
Solution Approach 2:
The eNB acts as an intermediary that resolves resource contention between multiple D2D pairs by evaluating cellular UE schedules and allocating reusable resources centrally. This eliminates the need for D2D pairs to perform time-consuming RTS/CTS exchanges, significantly reducing link setup time.
4Device complexity
If eNB has no awareness of D2D links, then system complexity is reduced, but ability to manage and charge for D2D communications is lost
Solution Approach 1:
The eNB receives feedback from D2D pairs in the form of reuse requests and provides feedback through grant decisions and resource allocation notifications. This feedback loop enables the eNB to maintain awareness of D2D links, manage resources effectively, and implement service charging based on observed usage patterns.
Solution Approach 2:
The eNB serves as an intermediary that gains awareness of D2D communications by mediating resource reuse requests. This centralized awareness enables the network to manage D2D links, monitor resource usage, and implement service charging mechanisms without significantly increasing system complexity.
Data Source
AI summary
Device-to-device (D2D) communication is one alternative to communication between devices through a radio access network. One interesting D2D communication method is reuse-mode D2D, where D2D nodes communicate with each other using the same uplink (UL) radio resource that is being used by some other cellular user equipment(s) (UEs). In other words, the UL cellular resources occupied by cellular UEs are reused by D2D nodes in their short-range communications. Centralized control of D2D communication can be performed by appropriate signaling between a D2D-capable UE and an evolved Node B (eNB).