Base Station Extended Subframe Dynamic UL-DL Allocation
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Solution Overview
Problem
Current cellular radio communication systems face challenges in flexibly allocating radio resources between uplink and downlink communications due to the inflexibility in UL-DL configurations, leading to inefficient use of radio resources and interference between neighboring base stations.
Innovation Solution
The introduction of extended subframes that can be dynamically allocated for either uplink or downlink communication, allowing for flexible radio resource allocation and reduced interference through scheduling by the base station, along with the use of virtual cell identifiers and reduced transmission power in extended subframes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UL-DL configuration is switched using system information or higher layer signaling, then the UL-DL configuration can be changed, but flexible switching is difficult and resource allocation is inefficient
Solution Approach 1:
The patent introduces a new subframe type (extended subframe) that can dynamically switch between uplink and downlink usage through base station scheduling, rather than being fixed by static UL-DL configurations. This allows the system to adapt radio resource allocation in real-time based on traffic conditions, resolving the contradiction between adaptability and complexity by providing dynamic flexibility without requiring complex configuration switching procedures
Solution Approach 2:
The patent changes the parameter of subframe functionality by introducing extended subframes that can be configured as either uplink or downlink through scheduling control. This parameter change enables flexible resource allocation by modifying the operational state of subframes based on traffic demands, rather than changing the entire UL-DL configuration through complex signaling
2Productivity
If radio resources are allocated according to fixed UL-DL configurations, then system operation is simple, but radio resources cannot be appropriately allocated to match traffic demands
Solution Approach 1:
The patent enables dynamic resource allocation by introducing extended subframes that can be scheduled as uplink or downlink based on real-time traffic conditions. This dynamic approach improves productivity by matching resource allocation to actual traffic demands while maintaining ease of operation through base station-controlled scheduling without requiring complex terminal-side configuration changes
Solution Approach 2:
The extended subframe serves multiple functions by being capable of operating as either uplink or downlink based on scheduling needs. This multi-functionality improves resource utilization efficiency by allowing the same subframe structure to adapt to different traffic patterns, eliminating the need for separate dedicated uplink and downlink subframe configurations
3Object-affected harmful factors
If transmission power is maintained at standard levels in all subframes, then communication reliability is ensured, but interference between neighboring base stations increases
Solution Approach 1:
The patent applies different transmission power levels to different subframe types locally. Extended subframes use reduced transmission power compared to standard subframes, creating localized quality differences in power transmission. This resolves the contradiction by reducing interference in specific contexts (extended subframes) while maintaining standard power levels in other subframes where full reliability is needed
Data Source
AI summary
A radio communication system includes one or more user terminals and one or more base stations that execute time division radio communication using a time division duplex (TDD) system. A radio frame is a radio communication resource used in the time division radio communication, and includes a downlink subframe that is a transmission period of a downlink signal, a special subframe including a guard period that is used neither for transmission of a downlink signal nor for transmission of an uplink signal, and an extended subframe that is used as either a transmission period of a downlink signal or a transmission period of an uplink signal, in accordance with a scheduling by the base station.