Uplink Subframe Scheduling for Downlink Data Transmission
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Solution Overview
Problem
In wireless communications, particularly in FDD systems, the scarcity of wireless resources is exacerbated by low utilization of uplink spectrum due to mismatched traffic volumes, leading to inefficient allocation and utilization of wireless spectrum resources.
Innovation Solution
A method and device for sending and receiving downlink control information, where a base station instructs user equipment to receive physical downlink shared channel information in an uplink subframe, optimizing the use of wireless spectrum resources by scheduling uplink subframes for downlink services and diverting load pressure from downlink subframes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If more wireless spectrum resources are allocated to meet downlink traffic volume requirements, then downlink service quality is improved, but uplink spectrum utilization deteriorates due to idle resources
Solution Approach 1:
The patent applies multi-functionality by enabling uplink subframes to serve dual purposes: traditionally for uplink services and now also for downlink data transmission. The base station schedules downlink data in uplink subframes when uplink traffic is light, making the uplink spectrum resources universally usable for both uplink and downlink services, thereby improving overall spectrum utilization while maintaining downlink service quality
Solution Approach 2:
The patent implements dynamic subframe configuration where the base station can flexibly adjust which subframes are designated for uplink or downlink based on real-time traffic conditions. When uplink traffic volume is low, downlink subframes are dynamically allocated to carry downlink data, and when uplink traffic increases, subframes are reassigned to uplink services. This dynamic adaptation resolves the contradiction by optimizing resource allocation according to actual demand
2Productivity
If uplink subframes are used for downlink services, then overall spectrum resource utilization is improved, but system complexity increases due to additional scheduling mechanisms
Solution Approach 1:
The patent changes the parameter of subframe direction assignment by introducing a configurable parameter that determines whether a subframe is allocated for uplink or downlink. The base station modifies this parameter dynamically based on traffic conditions, allowing the same physical subframe to serve different functions. This parameter-based flexibility improves spectrum utilization while keeping the underlying system structure relatively simple
Solution Approach 2:
The patent applies preliminary action by having the base station pre-configure and notify user equipment about the direction assignment of each subframe in advance through system information or signaling. This allows user equipment to prepare appropriately for receiving downlink data in uplink subframes or transmitting uplink data in downlink subframes, reducing the complexity of real-time decision-making and simplifying the scheduling mechanism
Data Source
AI summary
The present invention discloses a downlink control information sending method and device, and a downlink control information receiving method and device. The sending method includes: sending, by a base station device, downlink control information DCI on a physical downlink control channel PDCCH of a downlink subframe, where the DCI is used to instruct user equipment UE to receive physical downlink shared channel PDSCH information in an uplink subframe; and sending the PDSCH information in the uplink subframe. In this way, the base station can effectively schedule an uplink subframe, and a purpose of transmitting a downlink service by using an uplink subframe is achieved, which not only improves utilization of a wireless spectrum resource corresponding to the uplink subframe, but also effectively diverts load pressure of a wireless spectrum resource corresponding to a downlink subframe. Therefore, overall utilization of wireless spectrum resources of a system is improved.