Dynamic Uplink Payload Determination for MulteFire Shared Spectrum
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Solution Overview
Problem
In wireless communication systems, especially in shared radio frequency spectrum bands, efficient uplink scheduling and payload size determination are challenging due to intermittent availability of carriers, leading to reduced throughput and unreliable control information transmission.
Innovation Solution
A method and apparatus for determining payload size for unscheduled uplink control messages in a shared radio frequency spectrum, where a user equipment (UE) or base station can autonomously select or blindly detect the payload size based on uplink control information, and use various downlink control message formats to indicate available resources and grant transmissions across different transmission opportunities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carriers in shared spectrum are used for uplink communication, then spectrum utilization is improved, but intermittent availability due to contention reduces reliability of control information transmission
Solution Approach 1:
The payload size for uplink control messages is made dynamically adjustable rather than fixed. The UE can autonomously determine payload size from a set of predetermined sizes based on actual control information needs, allowing the system to adapt to varying channel conditions and contention scenarios in shared spectrum, thereby maintaining reliability while utilizing spectrum efficiently
Solution Approach 2:
The system changes the parameter of payload size to resolve the contradiction. By allowing variable payload sizes instead of fixed sizes, the system can optimize transmission reliability for control information while maintaining high spectrum utilization. The base station can indicate payload size to UE, or UE autonomously selects from predetermined sizes based on channel conditions
2Adaptability or versatility
If UE autonomously determines payload size, then transmission flexibility is improved, but scheduling complexity at base station increases
Solution Approach 1:
The UE autonomously determines the payload size for its uplink control messages based on the amount of control information to be transmitted and channel conditions. This self-service approach allows the UE to adapt transmission parameters without requiring complex base station scheduling decisions, resolving the contradiction by shifting the adaptation burden to the UE while maintaining base station simplicity
Solution Approach 2:
Instead of requiring the base station to fully determine all transmission parameters, the system allows the UE to partially determine payload size autonomously. The UE selects from a predefined set of payload sizes, which provides sufficient flexibility for adaptation while keeping base station processing requirements manageable through partial automation
3Extent of automation
If base station blindly detects payload size, then UE autonomy is improved, but detection complexity and time increase
Solution Approach 1:
The system changes the parameter space for payload size to a finite set of predetermined sizes. This discretization allows the base station to perform blind detection more efficiently by testing against known size options rather than searching continuous space, reducing detection complexity while maintaining UE autonomy in selecting appropriate payload sizes
Solution Approach 2:
The system uses a set of predetermined payload sizes that can be quickly tested and discarded during blind detection. Instead of complex continuous parameter estimation, the base station efficiently checks against predefined size options, making the detection process simpler and faster while preserving UE autonomy in the original selection
4Adaptability or versatility
If multiple downlink control indicator formats are used for uplink grants, then resource allocation flexibility is improved, but message format complexity increases
Solution Approach 1:
The uplink grant information is segmented into multiple downlink control indicator formats, each optimized for specific resource allocation scenarios. This segmentation allows flexible resource allocation for different transmission opportunities while keeping each individual format relatively simple and manageable, resolving the contradiction through structured division of control information
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. The payload size for uplink transmissions of unscheduled control information may vary and, in some cases, may be dynamically determined. A user equipment (UE) may determine a payload size or may select a payload size from a set of predetermined sizes. A base station may independently determine the same payload size or it may blindly detect the payload size upon receiving the uplink (UL) transmission. Or the base station may indicate the payload size to the UE. Additionally, UL grants issued to the UE may take one of several forms (e.g., different downlink control indicator formats), and characteristics of the grant may indicate information about resources assigned by the grant, including a location of the resources among various transmission opportunities or whether the grant is for multiple subframes.