Flexible Duplex Subframe Configuration for LTE Traffic Adaptation
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Solution Overview
Problem
The existing LTE FDD system has a fixed duplex direction for each carrier, which is not adaptable to varying uplink and downlink traffic conditions, leading to inefficient resource allocation and reduced throughput.
Innovation Solution
A method and apparatus for flexible duplex processing, allowing dynamic configuration of uplink and downlink subframes on a pair of carriers to better match traffic variations, where subframes can change duplex directions based on traffic requirements, using semi-static or dynamic re-configuration DCI, and utilizing the same or different timing advance groups for uplink and downlink transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fixed duplex direction is used for each carrier in LTE FDD system, then system structure is simple and reliable, but resource allocation is inefficient and throughput is reduced when traffic conditions vary
Solution Approach 1:
The patent applies dynamics by enabling the duplex direction of subframes to be dynamically changed based on traffic conditions. The eNodeB can reconfigure the duplex direction of downlink subframes to uplink subframes or vice versa, transforming a static system into a dynamic one that adapts to varying traffic demands, thereby improving throughput without being constrained by fixed duplex configurations
Solution Approach 2:
The patent changes the parameter of duplex direction from fixed to flexible. By allowing the duplex direction parameter to be reconfigured through higher layer signaling, the system can adjust the allocation of uplink and downlink subframes according to actual traffic conditions, resolving the contradiction between simplicity and efficiency
2Productivity
If flexible TDD re-configuration is applied to adjust uplink-downlink subframe proportion, then peak rates and throughput are increased, but system complexity increases due to multiple re-configuration options
Solution Approach 1:
The patent segments the re-configuration process by introducing a specific re-configuration subframe dedicated to carrying re-configuration information. This separates the re-configuration function from normal data transmission, making the system more manageable and reducing the complexity of processing multiple re-configuration options while still enabling flexible adjustment of uplink-downlink proportions
Solution Approach 2:
The patent applies preliminary action by pre-defining specific subframes as re-configuration subframes that are dedicated to carrying re-configuration information. This advance preparation simplifies the system operation by establishing a clear framework for re-configuration, reducing the complexity of handling dynamic adjustments while maintaining high peak rates
3Productivity
If multiple aggregated carriers are used to achieve wider working bandwidth, then transmission rate is supported at higher levels, but resource allocation flexibility is reduced when traffic conditions vary
Solution Approach 1:
The patent applies universality by enabling each carrier in the aggregated set to serve multiple functions - both as downlink carrier and as uplink carrier depending on the re-configuration. This multi-functionality allows the system to maintain high transmission rates through carrier aggregation while simultaneously achieving flexible adaptation to varying traffic conditions, as any carrier can be dynamically assigned based on current demand
Data Source
AI summary
The present invention provide a method for processing flexible duplex, including: receiving, by a UE, configuration information of flexible duplex; and according to the received configuration information of flexible duplex, transmitting and receiving data by the UE based on configured uplink and downlink subframe distribution on one or two carriers of a flexible duplex cell. The present disclosure further provides an apparatus for processing flexible duplex. The method and apparatus of the present disclosure support to configure uplink and downlink subframes at the same time on a pair of carriers or one of a pair of carriers of the flexible duplex cell, so as to meet requirements of uplink and downlink traffics.