Full-Duplex UE Inter-Cell Coordination via Serving BS Mediator
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Solution Overview
Problem
In wireless communication systems, especially in next-generation networks, there is a challenge in efficiently managing full-duplex radio communications where user equipment (UE) operates in full-duplex mode while base stations (BS) operate in half-duplex mode, leading to complexities in inter-cell cooperation and interference management, particularly in coordinating uplink and downlink channels between different base stations.
Innovation Solution
The method involves using cell identifiers (IDs) to differentiate and manage uplink and downlink signals, with the UE transmitting feedback information to a serving base station that operates on the downlink, allowing for inter-cell cooperation and efficient channel state feedback transmission, even when the UE establishes channels with different base stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE transmits uplink feedback to a serving base station operating on downlink while established with a different base station for downlink, then inter-cell cooperation efficiency is improved, but device complexity and coordination overhead increase
Solution Approach 1:
The serving base station acts as an intermediary that receives uplink feedback from the UE and forwards it to the downlink base station. This mediator approach enables indirect communication between the UE and the downlink BS, resolving the contradiction by improving cooperation efficiency while managing complexity through a structured forwarding mechanism rather than direct complex coordination between all parties
Solution Approach 2:
The system segments the communication function by separating the uplink reception role (serving BS) from the downlink transmission role (downlink BS). This segmentation allows each base station to specialize in its respective function while the network coordinates the information flow, improving overall efficiency while distributing complexity across multiple nodes rather than concentrating it in a single complex coordination mechanism
2Productivity
If the UE operates in full-duplex mode while base stations operate in half-duplex mode, then communication capacity is improved, but interference management complexity increases
Solution Approach 1:
The network introduces intermediary coordination mechanisms where base stations exchange interference information and coordinate their operations. The serving base station that receives uplink feedback acts as an intermediary that helps manage interference by relaying information about UE transmission states to the downlink base station, enabling interference coordination without requiring full-duplex capability at the base station level
Solution Approach 2:
The system dynamically adjusts operational parameters such as resource allocation, power levels, and timing configurations to manage interference between full-duplex UE and half-duplex base stations. By changing these parameters adaptively based on channel conditions and interference levels, the system maintains high communication capacity while controlling interference management complexity through parameter optimization rather than complex structural changes
3Productivity
If separate management of uplink and downlink channels between different base stations is implemented, then channel utilization is improved, but coordination overhead increases
Solution Approach 1:
The system performs preliminary actions by pre-configuring the feedback forwarding paths and establishing coordination protocols between base stations before actual data transmission begins. This preliminary setup includes pre-negotiating resource allocations and interference management strategies, which reduces the coordination overhead during actual operation by having these decisions made in advance rather than in real-time
Solution Approach 2:
The system implements feedback mechanisms where the serving base station receives uplink feedback from the UE and forwards relevant information to the downlink base station. This feedback loop enables continuous optimization of channel utilization while managing coordination overhead through structured information exchange. The feedback mechanism ensures that each base station has the necessary information to make local decisions, reducing the need for constant high-level coordination
Data Source
AI summary
A method of transmitting and receiving a signal by a serving base station (BS) in a wireless communication system is disclosed. The method includes receiving, from a user equipment (UE), an uplink (UL) signal including a cell identifier (ID) of a first BS transmitting a downlink (DL) signal to the UE, determining whether the cell ID of the first BS is identical to a cell ID of the serving BS, transmitting a DL signal to the UE based on the cell ID of the first BS being identical to the cell ID of the serving BS, and transmitting information on the UL signal to the first BS based on the cell ID of the first BS being different from the cell ID of the serving BS. The UE supports full-duplex radio, and the UL signal includes a feedback for a DL signal transmitted by the first BS.