Preconfigured Uplink Resources for Low-Overhead Small Data Transmission
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in allocating uplink resources for UEs with small data transmissions, leading to substantial overhead due to multi-step procedures for obtaining uplink grants.
Innovation Solution
Implementing preconfigured uplink resources (PUR) techniques, where UEs receive an indication of PUR availability from a base station, request and manage PUR configurations, and handle responses such as configuration changes or rejections, using methods like early data transmission (EDT) random access procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multi-step procedures are used for obtaining uplink grants, then uplink resource allocation can be controlled and scheduled, but overhead becomes substantial relative to small data transmissions
Solution Approach 1:
The patent applies preliminary action by pre-configuring uplink resources for the UE before actual data transmission occurs. The base station configures PUR (preconfigured uplink resources) including time resources, frequency resources, and modulation/coding schemes in advance, so that when the UE has data to transmit, it can immediately use the pre-configured resources without going through multi-step grant acquisition procedures. This reduces signaling overhead while maintaining allocation control.
Solution Approach 2:
The patent extracts the essential resource allocation control function from the complex multi-step grant acquisition procedure. By separating the configuration phase (where the base station defines PUR parameters) from the transmission phase (where the UE simply uses the pre-configured resources), the system retains scheduling control capability while eliminating the overhead-heavy interactive grant request/response cycle for small data transmissions.
2Loss of substance
If preconfigured uplink resources are allocated to UEs, then overhead for small data transmissions is reduced, but resource allocation flexibility and control are limited
Solution Approach 1:
The patent applies dynamics by making the preconfigured uplink resources adjustable and adaptable. The base station can modify PUR parameters including time resources, frequency resources, and modulation/coding schemes based on changing network conditions and UE requirements. The system can transition between different PUR configurations or adjust existing ones dynamically, maintaining flexibility while preserving the overhead benefits of preconfiguration.
Solution Approach 2:
The patent utilizes parameter changes by allowing the base station to modify various parameters of the preconfigured uplink resources such as time resources, frequency resources, and modulation and coding schemes. These parameter adjustments enable the system to adapt to different data volumes, channel conditions, and scheduling requirements while maintaining the efficient preconfigured resource structure that reduces overhead.
3Productivity
If UEs transmit data using preconfigured resources without grants, then transmission speed and efficiency improve, but reliability of resource allocation decreases
Solution Approach 1:
The patent applies feedback mechanisms where the UE provides feedback information to the base station about its data transmission needs and channel conditions. The base station uses this feedback to adjust and refine the preconfigured uplink resources, ensuring that the allocated resources remain reliable and appropriate. This feedback loop maintains reliability while preserving the efficiency benefits of grant-free transmission.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. that support preconfigured uplink resources (PUR) in wireless communications. A base station may communicate that support for PUR is available, and may allocate PUR resources to a user equipment (UE) based on requests from the UE. The UE may receive an indication that the base station supports PUR, such as via a system information block (SIB), determine to request PUR, and transmit a PUR request message to the base station. A PUR response from the base station may indicate configuration, or reconfiguration of PUR allocation for the UE that may be used for uplink transmissions, or release of the PUR allocation.