Network Node Scheduling for ProSe Interruption Reduction
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Solution Overview
Problem
ProSe operation in wireless communications causes interruptions in serving cell performance, particularly due to the retuning of receiver chains during device-to-device (D2D) communication, leading to subframe interruptions and performance degradation in wide area networks (WAN).
Innovation Solution
A method is implemented in network nodes to determine if a wireless device is configured with discontinuous reception (DRX) on a communication link, comparing the target quality of a second communication link with the interruption probability due to the first link's operation, and selecting a scheduling scheme to minimize interruptions by overlapping resource scheduling or avoiding interruption-prone subframes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE receiver chain is retuned during D2D communication, then D2D communication capability is enabled, but serving cell interruption occurs
Solution Approach 1:
The network node pre-configures the UE with multiple uplink carrier frequencies and pre-determines which carriers are suitable for D2D communication. This preliminary configuration allows the UE to quickly switch to a pre-identified suitable carrier when D2D communication is needed, minimizing the interruption time on the original serving cell.
Solution Approach 2:
The invention introduces an intermediary mechanism where the network node provides assistance information containing multiple candidate carrier frequencies. The UE uses this intermediary information to select an appropriate carrier for D2D communication, thereby avoiding direct interruption of the serving cell while enabling D2D functionality.
2Adaptability or versatility
If the UE switches reception between D2D and WAN, then both D2D and WAN communication are supported, but receiver chain retuning causes subframe interruption
Solution Approach 1:
The network node pre-identifies and provides multiple suitable uplink carrier frequencies that can be used for D2D communication. This preliminary preparation enables the UE to quickly switch carriers without extensive retuning, thereby reducing the time loss during mode switching between D2D and WAN communication.
Solution Approach 2:
The invention enables dynamic carrier selection where the UE can switch between different uplink carriers based on communication mode requirements. The network node dynamically provides assistance information with multiple candidate carriers, allowing the UE to adaptively select the most appropriate carrier for current communication needs, minimizing switching time.
3Reliability
If D2D resources are allocated frequently, then D2D communication quality is improved, but uplink resource availability for cellular communication is reduced
Solution Approach 1:
The invention segments the uplink spectrum into multiple carrier frequencies, with some carriers designated for D2D communication and others for cellular communication. The network node provides assistance information that helps the UE identify which carriers are suitable for D2D, thereby segmenting resource usage and reducing competition for uplink resources between D2D and cellular communications.
Solution Approach 2:
The network node provides assistance information that contains copies or references to suitable carrier frequencies for D2D communication. This allows the UE to access D2D resources without directly competing with cellular uplink resources, effectively creating a parallel resource allocation mechanism that maintains both D2D quality and cellular productivity.
Data Source
AI summary
A method in a network node (115) is disclosed. The method comprises determining (504) whether a wireless device (110) is configured with discontinuous reception on a first communication link. The method comprises comparing (508) a target quality for a second communication link with an interruption probability or rate due to operation of the first communication link, and selecting (512) a scheduling scheme based at least in part on the comparison of the target quality for the second communication link with the interruption probability or rate due to operation of the first communication link. The method comprises scheduling (516) one or more resources for the wireless device (110) according to the selected scheduling scheme.