Cross Subframe Scheduling for Wireless Data Transmission
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Solution Overview
Problem
In wireless access systems, especially those supporting carrier aggregation and multiple cells, there is a challenge in smoothly transmitting and receiving uplink/downlink data while minimizing interference between homogeneous and heterogeneous networks, which affects data transmission rates and network efficiency.
Innovation Solution
The implementation of cross subframe scheduling, where control information severely influenced by interference is transmitted in subframes with lesser interference, using techniques like reserved bits in the carrier indication field (CIF) or subframe indication field (SIF) to indicate the correct subframe for data transmission, allowing for reliable PDCCH and PDSCH/PUSCH scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cross subframe scheduling is implemented to reduce interference, then data transmission reliability is improved, but device complexity increases due to additional scheduling mechanisms
Solution Approach 1:
The patent applies preliminary action by pre-configuring subframe indication fields and interference coordination information before data transmission occurs. The base station prepares and transmits scheduling information in advance, indicating which subframes will have reduced interference, allowing the terminal to proactively adjust its reception parameters and avoid interference-prone subframes.
Solution Approach 2:
The patent uses subframe indication fields and interference coordination messages as intermediaries between the base station and terminal. These intermediaries carry scheduling information that mediates the coordination between multiple cells, enabling the terminal to understand and adapt to interference patterns without direct complex processing at the terminal side.
2Productivity
If carrier aggregation with multiple cells is used to increase bandwidth, then data transmission rate is improved, but interference between homogeneous and heterogeneous networks increases
Solution Approach 1:
The patent applies local quality by identifying specific subframes with different interference characteristics across multiple cells. Instead of treating all subframes uniformly, the system assigns different qualities to different subframes based on their interference levels, allowing data transmission to occur preferentially in subframes with better quality (lower interference) for each specific cell.
Solution Approach 2:
The patent changes the temporal parameter of data transmission by shifting scheduling to different subframes. By dynamically adjusting which subframes are used for data transmission based on interference conditions, the system transforms the time-domain characteristics of carrier aggregation to avoid simultaneous transmissions that cause interference.
3Speed
If control information is transmitted in the same subframe as data to reduce latency, then transmission speed is improved, but reliability decreases due to interference affecting both control and data channels
Solution Approach 1:
The patent segments the transmission timeline by separating control information and data into different subframes. Control information is transmitted in subframes optimized for control channel reliability, while data transmission occurs in subframes with better overall conditions. This temporal segmentation allows each type of information to be transmitted under optimal conditions without mutual interference.
Data Source
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AI summary
Disclosed are a method for transceiving data in a wireless access system, and a base station and terminal therefor. More particularly, the present invention relates to a method for transceiving data, and to a base station device for the method, wherein the method comprises the steps of: transmitting, in a single first subframe, a physical downlink control channel (PDCCH) including downlink scheduling information on each terminal; and transmitting, in a plurality of second subframes, a physical downlink shared channel (PDSCH) relevant to said PDCCH to each terminal. The PDCCH supports a carrier aggregation that includes a field indicating said plurality of second subframes in which said PDSCH is transmitted.