Dynamic Uplink Subframe Configuration for Flexible TDD Resource Allocation
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Solution Overview
Problem
In LTE TDD systems, the inflexible configuration of uplink-downlink subframe ratios reduces the availability of uplink resources for user equipment (UE), limiting the flexibility in sending channel quality indicators (CQI), scheduling requests (SR), and sounding reference signals (SRS), and increasing random access delays.
Innovation Solution
The method involves receiving resource configuration indication information and subframe configuration indication information from a base station to determine whether to transmit uplink information in flexible subframes, allowing for dynamic adjustment of subframe directions and utilization of additional uplink resources, thereby increasing the availability of uplink subframes for UE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the base station configures uplink resources to a constant uplink subframe, then the uplink resource configuration is simple and stable, but the quantity of uplink subframes actually available to the UE becomes smaller and the uplink resources cannot be flexibly configured
Solution Approach 1:
The patent introduces dynamic subframe configuration where the base station can flexibly adjust which subframes are designated as uplink subframes based on actual traffic conditions. The UE receives dynamic indication information that specifies whether each flexible subframe should be used for uplink transmission in a given time period, allowing the system to adapt resource allocation to changing demands while maintaining clear configuration signaling.
2Productivity
If the base station uses fixed TDD uplink-downlink subframe ratio configuration, then the system operation is stable and simple, but the random access delay increases and uplink resource utilization is reduced
Solution Approach 1:
The patent enables dynamic changing of TDD uplink-downlink subframe ratio parameters based on actual system conditions. The base station can adjust the configuration to change the number and positions of uplink subframes within a radio frame, thereby optimizing uplink resource utilization for traffic-heavy scenarios while reducing random access delays by ensuring adequate uplink opportunities are available.
3Adaptability or versatility
If the base station configures flexible subframes for uplink transmission, then the uplink resource availability increases, but the UE needs to receive additional configuration information increasing signaling overhead
Solution Approach 1:
The patent designs the downlink control information (DCI) format to serve multiple functions: it simultaneously conveys uplink scheduling assignments and dynamic subframe configuration indications. By embedding the subframe configuration information within the existing DCI structure used for uplink grants, the system achieves flexible resource allocation without requiring separate dedicated signaling channels, thus minimizing additional overhead.
Data Source
AI summary
A method and an apparatus for transmitting uplink information, the method including configuring, by a base station, a flexible subframe for a user equipment (UE), where the flexible subframe is a subframe in which the base station is configured to receive or transmit data according to a time division duplex (TDD) uplink-downlink subframe configuration of the subframe, and sending, by the base station, resource configuration indication information and subframe configuration indication information to the UE, where the resource configuration indication information indicates the flexible subframe and a subframe direction to which the flexible subframe currently needs to be applied, where the subframe direction is a direction of transmission with respect to the base station, and where the subframe configuration indication information instructs the UE to transmit uplink information according to the subframe configuration indication information.