Subframe Type Indication for Wireless Communication Timing
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Solution Overview
Problem
Current wireless communication systems face challenges in dynamically configuring subframe types, leading to timing ambiguity and increased higher-layer control signal overhead, particularly in device-to-device (D2D) communication scenarios.
Innovation Solution
A method where a user equipment (UE) determines the subframe type from among a plurality of types by indicating the subframe type of a first subframe based on previous subframes, allowing for dynamic configuration and reducing the need for long resource pool bitmaps, thereby overcoming timing ambiguity and minimizing higher-layer control signal overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic subframe type configuration is implemented, then adaptability is improved, but timing ambiguity increases
Solution Approach 1:
The patent applies preliminary action by having the eNB indicate the subframe type in advance through downlink control information before the actual subframe transmission. This allows the UE to prepare for the upcoming subframe with known timing characteristics, resolving the timing ambiguity while maintaining dynamic configuration capability.
Solution Approach 2:
The patent implements feedback mechanisms where the eNB provides indication information about subframe types through downlink control channels, and the UE feeds back acknowledgment and timing information. This feedback loop ensures accurate timing synchronization while enabling dynamic subframe type changes.
2Reliability
If long resource pool bitmaps are used for subframe indication, then timing accuracy is improved, but higher-layer control signal overhead increases
Solution Approach 1:
The patent extracts only the essential timing information from the full resource pool bitmap, using compact indication mechanisms in downlink control information to convey subframe type details. This eliminates the need for lengthy bitmap transmissions while maintaining timing accuracy.
Solution Approach 2:
The patent changes the parameter representation from detailed bitmap formats to condensed indication fields in control information. By altering how timing information is encoded and transmitted, the system reduces control signal overhead while preserving the necessary timing accuracy for subframe synchronization.
Data Source
AI summary
One embodiment of the present invention relates to a method whereby a first terminal performs transmission or reception in a subframe in a wireless communication system, the subframe-type-related transmission/reception method comprising the steps of: determining to which a first subframe belongs among a plurality of subframe types; and performing either uplink transmission or downlink reception in an uplink resource or a downlink resource which is determined based on the determined type, wherein to which of the plurality of subframe types the first subframe belongs is indicated in each of K (K>1) subframes from the Lth (L>0) subframe in front of the first subframe, and each of the K subframes indicates to which of the plurality of subframe types K subframes from the Lth subframe therebehind belong. The first terminal is included in an autonomous vehicle.