Small Data Transmission Resource Request Delay Mechanism
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing small data transmissions from user equipment (UE) to a radio access network (RAN) when the UE is in an inactive or idle state, leading to potential delays and inefficiencies.
Innovation Solution
The proposed solution involves a method where the UE determines if a resource for transmitting a control element to the RAN is available during a small data transmission (SDT) procedure. If not, the UE delays requesting the resource according to a configured delay setting, optimizing resource allocation and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE transmits an SDT resource request to the base station to request uplink resources, then the UE can obtain resources for small data transmission, but the base station receives unnecessary requests and schedules resources less frequently for SDT data
Solution Approach 1:
The base station pre-configures uplink resources and delay settings for SDT before the UE needs to transmit data. The UE stores these pre-configured resources and uses them when SDT data arrives, avoiding the need to send resource requests at all. This preliminary configuration resolves the contradiction by eliminating unnecessary request transmissions while ensuring resources are available when needed.
Solution Approach 2:
The UE autonomously determines whether to transmit SDT data using pre-configured resources or to send a resource request, based on local conditions such as whether SDT resources are available and whether delay settings permit immediate transmission. This self-service approach reduces signaling overhead to the base station while maintaining efficient resource allocation for small data transmissions.
2Speed
If the base station schedules uplink resources frequently for SDT, then the UE can transmit small data quickly, but the base station wastes resources on non-urgent data
Solution Approach 1:
The system dynamically adjusts resource allocation based on the urgency and size of data. For small non-urgent SDT data, the UE uses pre-configured resources with associated delay settings, allowing flexible transmission timing. For urgent or larger data, the UE can trigger resource requests. This dynamic approach optimizes resource usage by matching allocation frequency to actual transmission needs.
Solution Approach 2:
The base station configures multiple parameter sets including delay thresholds and resource availability settings that the UE evaluates locally. By changing these parameters based on traffic conditions, the system can switch between aggressive resource allocation (for urgent data) and conservative pre-configured resource usage (for non-urgent small data), optimizing the balance between transmission speed and resource efficiency.
3Loss of time
If the UE immediately requests resources for SDT transmission, then transmission latency is reduced, but the system complexity increases due to lack of coordination mechanism
Solution Approach 1:
The base station performs all necessary coordination and resource allocation decisions in advance, configuring the UE with pre-approved resources and transmission parameters. This preliminary action eliminates the need for complex real-time coordination mechanisms, as the UE simply follows pre-established rules for when and how to use resources, reducing both latency and system complexity.
Solution Approach 2:
The UE is empowered to make autonomous decisions about resource usage based on pre-configured parameters, eliminating the need for complex request-grant coordination for each transmission. The UE self-determines whether to use pre-configured resources or request new resources based on simple local conditions, significantly reducing system complexity while maintaining low latency through immediate transmission when conditions permit.
Data Source
AI summary
To transmit a control element (CE) to a radio access network (RAN) (105), a UE (102) determines, when performing a small data transmission (SDT) procedure, that a resource for transmitting the CE to the RAN (105) is not available (e.g., event (704)). In response to the determining and in accordance with a delay configuration, the UE (102) delays a transmission of a request for the resource to the RAN (105) (e.g., event (708)).