Selective Cellular Transmission Scheduling for Latency and Resource Control
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Solution Overview
Problem
The integration of scheduled and unscheduled radio transmissions in cellular networks is challenging due to differences in latency and throughput characteristics between cellular and WiFi links, making efficient traffic distribution across these links difficult.
Innovation Solution
A method and device that select between scheduled and unscheduled transmissions based on delay, time limits, and unsuccessful attempt criteria to optimize data transmission, allowing for efficient use of both cellular and WiFi radio links without requesting resource allocation for unscheduled transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If scheduled transmission is used in cellular network, then resource allocation control is improved, but transmission latency increases due to resource request and allocation procedures
Solution Approach 1:
The system performs preliminary actions by pre-configuring transmission parameters, buffer status thresholds, and resource allocation criteria before data transmission is needed. The network pre-allocates resource pools and the UE pre-configures transmission buffers, allowing immediate transmission when data arrives without full resource allocation procedures, thus reducing latency while maintaining control.
Solution Approach 2:
The system dynamically switches between scheduled and unscheduled transmission modes based on real-time conditions such as buffer status, channel quality, and QoS requirements. This dynamic adaptation allows the system to use scheduled transmission when control is prioritized and unscheduled transmission when latency is critical, resolving the contradiction through context-dependent behavior.
2Speed
If unscheduled transmission is used, then transmission speed is improved by avoiding resource allocation requests, but resource utilization efficiency deteriorates
Solution Approach 1:
The system changes key parameters such as buffer status thresholds, transmission power levels, and resource pool configurations based on network conditions and QoS requirements. By dynamically adjusting these parameters, the system optimizes the balance between transmission speed and resource utilization efficiency for unscheduled transmissions.
Solution Approach 2:
The system implements feedback mechanisms where the network monitors resource utilization and transmission performance from unscheduled transmissions, then adjusts resource allocation policies, buffer thresholds, and transmission parameters accordingly. This closed-loop control ensures that unscheduled transmissions maintain high speed while preventing resource utilization degradation.
3Productivity
If traffic is distributed over cellular and WiFi links, then throughput is improved, but system complexity increases due to different link characteristics and coordination requirements
Solution Approach 1:
The system segments traffic into different flows based on QoS requirements, application type, and channel conditions, routing each segment through the most appropriate link (cellular or WiFi). This segmentation allows independent optimization of each traffic segment without requiring complex coordination across all traffic, reducing overall system complexity while maintaining high throughput.
Solution Approach 2:
The system implements a universal transmission framework that can handle both scheduled cellular transmissions and unscheduled WiFi transmissions through a common resource management and QoS enforcement mechanism. This multi-functionality allows the system to manage diverse transmission modes with a unified approach, reducing complexity compared to separate management systems.
4Reliability
If resource allocation requests are sent frequently to ensure data transmission, then transmission reliability is improved, but signaling overhead increases
Solution Approach 1:
The system applies partial resource allocation actions by using full scheduled resource allocation only when necessary for reliable transmission, while using lighter unscheduled transmission mechanisms for less critical data. Buffer status thresholds are configured to trigger resource requests only when data volume exceeds certain levels, avoiding excessive signaling while maintaining reliability for important transmissions.
Data Source
AI summary
A communication device (10) detects a need to transmit data to an access node (100) of a cellular network. In response to detecting this need, the communication device (10) performs a selection between a scheduled transmission of the data to the access node (100) and an unscheduled transmission of the data to the access node (100). In case of the scheduled transmission, the communication device (10) requests allocation of radio resources by the cellular network, in response to this requesting, receives an indication of allocated radio resources from the cellular network, and performs a radio transmission on the allocated radio resources to send the data to the access node (100). In case of the unscheduled transmission, the communication device (10) performs a radio transmission on further radio resources to send the data to the access node (100), without requesting allocation of radio resources by the cellular network.