TDMA Handover Packet Timing Adjustment
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Solution Overview
Problem
In TDMA systems, handovers between time slots often result in irregularities in the output stream due to abrupt timing differences, leading to suboptimal quality, especially when the new slot is positioned before or after the old slot, causing alignment issues and potential signal degradation.
Innovation Solution
Generating a handover packet of length N + Δ bits, where Δ accounts for the timing difference between the first and second time slots, allowing for a more sophisticated handover mechanism that adapts to timing differences and uses data from either time slot or concealment packets to optimize output stream quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a handover is performed abruptly from the first time slot to the second time slot, then the handover speed is improved, but the output stream quality deteriorates due to timing misalignment and irregularities
Solution Approach 1:
The patent applies preliminary action by generating the handover packet in advance during the handover process. The handover packet is prepared before the actual switch occurs, containing pre-calculated timing adjustments and data portions that will bridge the gap between the first and second time slots. This ensures that when the handover executes, the timing alignment is already optimized, maintaining output stream quality while achieving fast switching.
Solution Approach 2:
The patent changes the parameter of packet length dynamically during handover. The handover packet is generated with a specific length (N + Δ bits) that accounts for the timing difference Δ between the first and second time slots. This parameter adjustment ensures that the handover packet perfectly fills the timing gap, aligning the output stream without irregularities while maintaining rapid handover execution.
2Device complexity
If data portions from the first and second time slots are directly concatenated, then the handover process is simplified, but timing misalignment causes irregularities in the output stream
Solution Approach 1:
The patent introduces an intermediary element - the handover packet - that mediates between the data portions from the first and second time slots. Instead of directly concatenating the time slot data, the handover packet acts as a bridge, containing timing adjustment information and intermediate data that smoothly transitions the output stream from the first time slot to the second, eliminating misalignment irregularities while maintaining process simplicity.
Solution Approach 2:
The patent adjusts the parameter of packet length to N + Δ bits, where Δ represents the timing difference between time slots. This parameter change ensures that the handover packet perfectly compensates for the timing misalignment, creating a seamless transition in the output stream without requiring complex synchronization mechanisms.
3Productivity
If the handover packet length is set to exactly N bits, then the data transmission is efficient, but the timing difference between time slots causes alignment issues
Solution Approach 1:
The patent changes the packet length parameter from the standard N bits to N + Δ bits, where Δ specifically accounts for the timing difference between the first and second time slots. This parameter adjustment ensures that the handover packet perfectly fills the timing gap, achieving precise timing alignment in the output stream while maintaining high data transmission efficiency through the optimized packet structure.
Data Source
Figure 1a~1b
Figure 2a~2b
Figure 2c~4
AI summary
The invention relates to a method for performing a handover in a TDMA system from a first time slot to a second time slot. The method comprises: a) receiving data portions comprising N bits in a first time slot (1) and using these data portions to generate a first part of an output stream (7); b) performing a handover from the first time slot to the second time slot, c) receiving data portions comprising N bits in a second time slot (3) and using these data portions to generate a second part of the output stream (7). Action b) comprises generating a handover packet (30, 30') to be part of the output stream (7) in between the first and second part of the output stream (7). The handover packet comprising N + Δ bits, where Δ takes into account a timing difference between the first time slot (1) and the second time slot (3).