Cross-Division Duplex Collision Handling for UL/DL Switching Gaps
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Solution Overview
Problem
Existing 5G NR networks face challenges in handling collisions and cross-link interference during cross-division duplex operations, particularly in scenarios where uplink and downlink transmissions overlap, leading to inefficiencies in resource allocation and coverage.
Innovation Solution
The UE determines transmission directions for each PRB in a slot to handle collisions, utilizing switching gap data and collision priority rules to manage DL to UL transitions, enabling efficient cross-link interference mitigation and flexible resource adaptation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If cross-division duplex operations are implemented to enhance uplink coverage, then uplink coverage is improved, but cross-link interference occurs when uplink and downlink transmissions overlap
Solution Approach 1:
The base station determines the transmission direction for each PRB in advance before actual transmission occurs. By pre-determining whether each PRB will be used for uplink or downlink transmission, the system可以避免 collisions and cross-link interference while maintaining the coverage benefits of XDD operations
Solution Approach 2:
The frequency bandwidth is divided into multiple physical resource blocks (PRBs), and each PRB can be independently assigned for uplink or downlink transmission. This segmentation allows fine-grained control of transmission directions, enabling the system to maximize coverage while minimizing interference by optimizing each PRB's usage
2Adaptability or versatility
If dynamic transmission direction assignment is implemented for each PRB, then resource allocation flexibility is improved, but collision handling complexity increases
Solution Approach 1:
The base station pre-determines and signals the transmission direction for each PRB to the UE before transmission occurs. This preliminary assignment simplifies collision handling by providing clear, advance instructions rather than requiring complex real-time collision detection and resolution mechanisms
Solution Approach 2:
The system uses uplink/downlink scheduling and collision priority information as feedback mechanisms to guide transmission direction decisions. The base station receives scheduling requests and uses this feedback to optimally assign PRB directions while managing potential collisions
Data Source
AI summary
A user equipment for cross-division duplex (XDD) operations comprises circuitry configured to perform operations for determining a transmission direction for a slot of a frame structure as being an uplink (UL) slot or a downlink (DL) slot operating in XDD mode based on scheduling data from a base station. The UE is configured to receive scheduling data indicating a switching gap of the frame structure for switching from DL to UL transmission, determine that the switching gap is smaller than a threshold value to cause a collision between UL transmission and DL reception for a slot, and resolve the collision based on the UL transmission and the DL reception.