TDD Frame Guard Interval Elimination for Payload Increase
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Solution Overview
Problem
The number of guard intervals in bidirectional communication frames limits the data payload, as they occupy time slots where no information is exchanged, and pilot symbols become obsolete in high-speed scenarios, reducing channel efficiency.
Innovation Solution
Detecting and replacing guard intervals between same-direction time slots with data and optionally replacing pilot symbols with data symbols, while optimizing slot allocation to maximize data payload without increasing frame duration, and adjusting guard interval duration for data insertion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of time slots in a frame is increased to improve data transmission capacity, then the data payload increases, but the number of guard intervals also increases, reducing the effective data transmission time
Solution Approach 1:
The patent extracts and removes the unnecessary guard intervals between consecutive time slots allocated to the same communication direction. By detecting successive slots in the same direction and eliminating the redundant guard intervals between them, the system recovers transmission time while maintaining data integrity, thus resolving the contradiction between increasing data payload and reducing time loss.
Solution Approach 2:
The patent changes the parameter of guard interval duration by dynamically adjusting it based on slot allocation patterns. When consecutive slots are allocated to the same direction, the guard interval between them is reduced or eliminated. This parameter change allows the system to increase effective data transmission time while maintaining the necessary protection against interference in opposite-direction transmissions.
2Measurement precision
If pilot symbols are included in each time slot to enable channel estimation, then channel properties can be accurately estimated, but the data payload of each slot is reduced
Solution Approach 1:
The patent applies multi-functionality by using recovered time resources (from eliminated guard intervals) and reduced pilot overhead to serve multiple purposes: increasing data payload, maintaining channel estimation accuracy through optimized pilot placement, and improving overall spectral efficiency. This resolves the contradiction by making the system more versatile in achieving multiple objectives simultaneously.
3Reliability
If guard intervals are maintained between all successive time slots to prevent interference, then signal integrity is preserved, but the effective data transmission capacity is reduced
Solution Approach 1:
The patent applies local quality by differentiating the treatment of guard intervals based on the allocation pattern of adjacent slots. Instead of uniformly applying guard intervals between all slots, the system selectively eliminates guard intervals only between consecutive slots allocated to the same direction, while maintaining them where needed. This localized approach preserves signal integrity where necessary while maximizing data transmission capacity where possible.
Data Source
AI summary
Method for transmitting through a bidirectional communication channel at least one conventional frame (CVFR) split into time slots SLj (for j=1 to L) separated from each other by guard intervals G, each time slot SLj being allocated either to a first or to a second direction of communication uplink (UL) or downlink (DL) offered by the bidirectional communication channel. The method according to the invention includes: detecting at least two successive time slots SLj, SLm+1, SLj+2 allocated to a same direction of communication DL, and inserting data in the guard interval separating such successive time slots SLj, SLj+1, SLj+2.