Flexible NR Frame Configuration for Subband Full Duplexing
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Solution Overview
Problem
The challenge in 5G New Radio (NR) is to enable simultaneous downlink and uplink transmissions on different physical resource blocks within an unpaired band of a cell, which results in reduced coverage, capacity, and increased latency due to the limitations of Time Division Duplexing (TDD).
Innovation Solution
A flexible frame structure configuration is introduced, allowing for dynamic or semi-static assignment of resources for uplink and downlink transmissions using subband non-overlapping full duplexing (SBFD), where the location and size of uplink-downlink subbands can be configured at a cell or operator level, and signaled through RRC and DCI messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If Time Division Duplexing (TDD) is used for uplink and downlink transmissions, then frequency resources can be shared, but coverage is reduced and latency is increased
Solution Approach 1:
The patent segments the unpaired frequency band into multiple physical resource blocks (PRBs) that can be independently configured for uplink or downlink transmissions. This allows simultaneous UL and DL on different PRBs within the same frequency band, effectively segmenting the frequency resources to enable full-duplex operation and reduce latency while maintaining efficient frequency utilization.
Solution Approach 2:
The patent transitions from purely time-domain resource allocation (TDD) to a combined frequency-time domain allocation approach. By introducing frequency-domain segmentation of unpaired bands into UL/DL PRBs, the system adds a frequency dimension to resource allocation, enabling simultaneous UL and DL transmissions and thereby reducing transmission latency.
2Quantity of substance
If Time Division Duplexing (TDD) is used for uplink and downlink transmissions, then frequency resources can be shared, but network flexibility is reduced
Solution Approach 1:
The patent implements dynamic resource allocation where the network can flexibly configure which PRBs are assigned for uplink or downlink transmissions based on real-time traffic demands. The gNB can dynamically adjust the UL/DL PRB assignment within unpaired bands, providing adaptability and versatility in resource management while maintaining efficient frequency utilization.
Solution Approach 2:
The patent enables dynamic parameter changes in resource allocation by allowing the network to reconfigure PRB assignments for UL and DL transmissions. Through RRC signaling and DCI messages, the system can change the configuration parameters of physical resource blocks, adjusting the balance between UL and DL resources according to varying traffic conditions, thereby enhancing network flexibility.
3Reliability
If subband non-overlapping full duplexing (SBFD) is implemented, then coverage and capacity are improved, but device complexity increases
Solution Approach 1:
The patent introduces standardized signaling mechanisms (RRC configuration messages and DCI) as intermediaries to manage the complexity of SBFD configuration. These signaling protocols provide a structured interface between the network and devices, automating the configuration process and reducing the burden on device complexity while enabling the network to effectively control UL/DL PRB assignments for improved coverage and capacity.
Data Source
AI summary
Embodiments of the present disclosure relate to devices, methods, apparatuses and computer readable storage media of resource allocation for time-division or frequency-division duplexing communication. The method comprising: receiving, at a first device and from a second device, first configuration information indicating a set of resources for time-division or frequency-division duplexing communication between the first device and the second device, the set of resources comprising a first subset of the resources for uplink transmission; and receiving, from the second device, second configuration information indicating at least one second subset of the resources for the uplink transmission, the at least one second subset of the resources comprising at least one resource other than the first subset of the resources.