Low Latency Wireless Subframe Structure for Signal Transmission
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Solution Overview
Problem
Current wireless communication systems face challenges in minimizing latency and efficiently managing resource allocation for both downlink and uplink transmissions, particularly in achieving low latency in 3GPP LTE systems.
Innovation Solution
A new resource structure is introduced, allowing for the allocation of resources through special symbols within a radio frame, which enables efficient transmission and reception by optimizing the number of OFDM symbols and special symbols in a subframe, thereby reducing PDCCH and PDSCH decoding latencies and supporting flexible duplex modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a traditional frame structure with fixed subframes is used, then system stability is maintained, but transmission latency increases
Solution Approach 1:
The patent divides the traditional fixed frame structure into multiple types of subframes (first subframes with first number of symbols, second subframes with second number of symbols, third subframes with third number of symbols). This segmentation allows flexible configuration of resource blocks to match varying traffic demands, reducing transmission latency by enabling more efficient resource utilization without requiring complete frame structure changes.
Solution Approach 2:
The patent introduces dynamic resource allocation by configuring different numbers of OFDM symbols in different subframe types (first, second, and third subframes with varying symbol counts). This dynamic structure adapts to real-time traffic conditions, allowing the system to optimize resource allocation for low-latency transmissions while maintaining overall system stability through structured flexibility.
2Productivity
If resources are allocated for both downlink and uplink in each subframe, then resource utilization improves, but interference between directions increases
Solution Approach 1:
The patent segments subframes into specific types (first subframes for downlink, second subframes for uplink, third subframes for flexible allocation) with different numbers of OFDM symbols. This segmentation allows dedicated resource allocation for each transmission direction within specific subframe types, reducing interference while maintaining high overall resource utilization through the flexible third subframe type.
3Quantity of substance
If the number of OFDM symbols per subframe is increased, then data transmission capacity increases, but decoding latency increases
Solution Approach 1:
The patent divides data transmission across multiple subframe types with different symbol counts. First subframes have a first number of symbols, second subframes have a second number, and third subframes have a third number. This segmentation allows the system to distribute data transmission capacity across multiple shorter subframes rather than using one long subframe, thereby maintaining total capacity while reducing the time required to decode individual transmissions.
Solution Approach 2:
The patent implements periodic transmission patterns using different subframe types in a structured sequence. By alternating between first, second, and third subframes with varying symbol configurations, the system achieves periodic data transmission that balances capacity requirements with latency constraints, allowing receivers to process data in regular intervals rather than waiting for complete long subframes.
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3~4
AI summary
A method for a transmitting side transmitting a signal for low transmission latency in a wireless communication system, according to one embodiment of the present invention, comprises the steps of: mapping a signal to at least one subframe; and the transmitting side transmitting the signal to a receiving side. Here, the at least one subframe is a legacy subframe comprising L number of orthogonal frequency division multiplexing (OFDM) symbols, or an advanced subframe comprising N number of OFDM symbols, wherein the advanced subframe may be transmitted twice or more times within the transmission period of the legacy subframe.