Multiple Configured Grant Repetition for Lower UE Complexity
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Solution Overview
Problem
Current wireless communication systems face challenges in managing multiple active configured grant configurations for UEs, leading to excess complexity and energy consumption, particularly in the transmission of repetitive transport blocks using configured uplink grants.
Innovation Solution
A method for transmitting data using a plurality of configured grants, allowing flexible allocation of resources by selecting different resources for subsequent repetitions of a transport block based on specific criteria, such as availability, reliability, and delay, while managing hybrid ARQ processes through timers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple active configured grant configurations are used for UEs, then transmission reliability and flexibility are improved, but UE complexity and energy consumption increase
Solution Approach 1:
The patent segments the configured grant configurations into different types (Type-1 and Type-2) with distinct characteristics. Type-1 CG uses fixed periodicity and resources, while Type-2 CG allows dynamic activation/deactivation and flexible resource allocation. This segmentation enables the system to manage multiple CG configurations without overwhelming the UE, as each type has well-defined management rules and the UE can select appropriate types based on transmission needs.
Solution Approach 2:
The patent introduces dynamic management mechanisms where the UE can activate or deactivate specific CG configurations based on current transmission requirements. The network can dynamically activate/deactivate Type-2 CG configurations, and the UE can dynamically select which CG to use for a given transmission. This dynamic approach reduces UE complexity by allowing it to maintain only the necessary CG configurations active at any given time while still providing flexibility when needed.
2Adaptability or versatility
If multiple active configured grant configurations are used for UEs, then transmission flexibility and reliability are improved, but energy consumption increases
Solution Approach 1:
The patent enables dynamic activation and deactivation of CG configurations based on actual transmission needs. The UE can deactivate CG configurations when not needed, reducing energy consumption for monitoring and managing multiple configurations. The network can dynamically activate Type-2 CG configurations only when flexible resource allocation is required, and deactivate them otherwise, balancing flexibility needs against energy consumption.
Solution Approach 2:
The patent allows changing key parameters of CG configurations, such as periodicity, resources, and activation status, based on transmission requirements. The UE can modify its behavior by selecting different CG types or adjusting parameters dynamically, allowing it to operate with lower energy consumption when flexibility is not needed while maintaining the capability for high-flexibility operations when required.
3Reliability
If configured grants support multiple repetitions of transport blocks, then transmission reliability is improved, but device complexity increases
Solution Approach 1:
The patent segments the repetition management into distinct handling procedures for different CG types. For Type-1 CG, repetitions follow a fixed pattern with predetermined resources. For Type-2 CG, the network dynamically specifies repetition details. This segmentation simplifies UE implementation by providing clear, type-specific algorithms for handling repetitions, avoiding the need for complex universal repetition management logic.
Solution Approach 2:
The patent incorporates HARQ feedback mechanisms where the UE receives acknowledgment information about transmitted transport blocks. Based on this feedback, the UE can determine whether repetitions are needed and which CG configuration to use for retransmissions. This feedback-driven approach simplifies complexity by allowing the UE to reactively manage repetitions based on actual transmission success rather than requiring complex proactive scheduling logic.
Data Source
AI summary
The invention refers to a method, performed by a user equipment, UE, for transmitting data based on a plurality of configured grants, CGs, of resources of a wireless network, the method comprising: receiving, from a network node serving the UE, configurations of a plurality of CGs of resources allocated for the UE to transmit data; transmitting, to the network node, an initial transmission of a transport block, TB, of data using first resources associated with a first one of the CGs, wherein the first CG supports a plurality of repetitions of a single TB; selecting second resources associated with a second one of the CGs for transmission of a subsequent repetition of the TB; and transmitting, to the network node, the subsequent TB repetition using the second resources associated with the second CG; the invention further refers to a method in a corresponding network node and to a corresponding UE and a network node respectively.