Flexible FDD Uplink Resource Adaptation for CG-PUSCH Reliability
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Solution Overview
Problem
In 5G New Radio (NR) networks, UE devices drop UL transmissions due to overlapping or falling outside the cell bandwidth, leading to increased signaling overhead and reduced multiplexing capabilities, especially in flexible FDD scenarios where CG-PUSCH frequency resources are not fully contained within the UL part of the cell bandwidth.
Innovation Solution
A network node dynamically allocates primary and secondary frequency resources to UEs, allowing them to adapt their transmissions based on the UL, DL, and guard band configurations within a changing bandwidth, minimizing collisions and signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If CG-PUSCH frequency resources are allocated outside the UL part of the cell bandwidth, then resource allocation flexibility is improved, but transmission reliability deteriorates because UE drops the UL transmission when resources overlap with DL/guard band or fall outside available bandwidth
Solution Approach 1:
The patent implements dynamic adaptation of CG-PUSCH frequency resources by introducing a dynamic adaptation field in DCI format 0_1 that indicates whether UE should adapt frequency resources based on current UL/DL/BW configuration. This allows the system to transition from static resource allocation to dynamic allocation, improving flexibility while maintaining reliability through conditional adaptation only when configurations change.
Solution Approach 2:
The patent changes the frequency resource parameters dynamically by providing alternative frequency resource indications through the dynamic adaptation field. When UL/DL/BW configuration changes occur, the gNB can indicate alternative frequency resources that are guaranteed to be within the UL part of the cell bandwidth, thus adapting the transmission parameters to current conditions while preventing transmission drops.
2Reliability
If UE drops UL transmission when CG-PUSCH resources overlap with DL/guard band, then transmission reliability is maintained, but signaling overhead increases and multiplexing capabilities are reduced
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple frequency resource sets and pre-establishing the dynamic adaptation mechanism through RRC signaling. The UE is prepared in advance with alternative frequency resources and the rules for switching between them, so when configuration changes occur, the UE can immediately use pre-determined alternative resources without requiring additional real-time signaling or dropping transmissions.
3Reliability
If dynamic scheduling is used to reallocate frequency resources, then transmission reliability is improved, but signaling overhead increases and multiplexing capabilities are reduced compared to CG-PUSCH
Solution Approach 1:
The patent makes the CG-PUSCH mechanism multi-functional by enabling it to operate in both static and dynamic modes. The same CG-PUSCH configuration can serve as stable periodic resources when configurations are unchanged, or adapt dynamically when UL/DL/BW configurations change, eliminating the need for separate dynamic scheduling mechanisms and reducing overall signaling overhead.
Data Source
AI summary
A network node allocates primary frequency resources and at least one secondary frequency resource to a user equipment (UE) within a dynamically changing bandwidth (BW) of a cell served by the network node. The network node further configures the UE to use the primary frequency resources for an UL transmission when the primary frequency resources fall within an UL part of the BW, and to use the secondary frequency resource for the UL transmission when the primary frequency resources fall, at least partly, within a downlink (DL) part and/or a Guard Band (GB) of the BW, and/or fall, at least partly, outside the BW. The UE may dynamically, based on such configuration from the network node, adapt its resource allocation to perform the UL transmission even if the primary frequency resources are not fully within the UL part of the BW in a current time resource.