Flexible Duplex Resource Allocation for Asymmetric Traffic
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Solution Overview
Problem
In conventional FDD systems, the fixed duplex direction and equal bandwidth of carriers result in inefficient use of resources, particularly when DL services significantly outnumber UL services, leading to wasted UL carrier resources.
Innovation Solution
Implementing a flexible duplex (FD) system where the duplex direction of subframes can be dynamically adjusted, allowing some subframes of the UL carrier to be used for DL transmission and vice versa, based on service requirements, with UE receiving configuration information to adapt HARQ-ACK timing accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the fixed duplex direction and equal bandwidth of carriers are used in conventional FDD systems, then the system structure is simple and easy to implement, but the resource utilization efficiency deteriorates when DL services significantly outnumber UL services
Solution Approach 1:
The patent implements dynamic duplex direction adjustment where the UL carrier can be flexibly configured to operate as DL carrier in certain subframes based on service requirements. This allows the system to adapt resource allocation dynamically - when DL services dominate, UL carrier resources are converted to DL resources, thereby resolving the contradiction between simple fixed structure and efficient resource utilization.
2Productivity
If some subframes of the UL carrier are used for DL transmission in flexible duplex system, then the resource utilization efficiency and system throughput are improved, but the system complexity and resource allocation management difficulty increase
Solution Approach 1:
The patent changes the operational parameters of the UL carrier by introducing a duplex direction indication parameter that controls whether the UL carrier operates in UL or DL mode in each subframe. This parameter-based control mechanism enables flexible resource allocation while maintaining manageable system complexity through standardized parameter management.
Solution Approach 2:
The patent implements feedback mechanisms where the network configures the UE with duplex direction indication information, and the UE adjusts its reception and transmission behavior accordingly. This feedback loop ensures proper resource allocation management while enabling improved throughput through flexible duplex operation.
3Adaptability or versatility
If the duplex direction is dynamically adjusted based on service requirements, then the adaptability to different service scenarios is improved, but the control signaling overhead and system coordination complexity increase
Solution Approach 1:
The patent uses parameter changes to indicate duplex direction - specifically, the network configures the UE with indication information (such as SPS release PDCCH/EPDCCH detection results) that tells the UE whether to expect DL or UL transmission in upcoming subframes. This parameter-based approach provides service scenario adaptability while controlling signaling overhead through efficient parameter encoding.
Data Source
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AI summary
Embodiments of the present disclosure provide a method for communicating data on PDSCH, including: receiving, by a user equipment (UE), configuration information, with which the UE works in a flexible duplex (FD) mode; receiving, by the UE, data of a PDSCH and control data of a physical downlink control channel (PDCCH) or enhanced physical downlink control channel (EPDCCH) indicating downlink (DL) semi-persistent scheduling (SPS) release according to a scheduling mode of the FD mode; and feeding back, by the UE, hybrid automatic repeat request-acknowledge (HARQ-ACK) information according to a corresponding HARQ-ACK timing. An embodiment of the present disclosure may further disclose a user device. With the present disclosure, the UL and DL peak rate of the user may be enhanced and the throughput of the system may be enhanced.