Time Difference Determination for Downlink Timing Alignment
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Solution Overview
Problem
Current radio communication systems face challenges in maintaining network synchronization and reducing mutual interference between nodes, particularly in high-frequency communication systems like the new radio (NR) system, due to timing alignment issues between uplink and downlink transmissions.
Innovation Solution
A time difference determination method is introduced, which uses specific parameters such as timing advance, timing advance offset, timing parameter index, reference, and granularity to calculate a time difference (T_delta) that aligns downlink transmitting timing between nodes, thereby maintaining network synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the IAB-node advances downlink transmitting timing by half of the timing advance (TA), then the downlink transmitting timing alignment between nodes is improved, but the timing parameter determination becomes complex due to offset between uplink receiving timing and downlink transmitting timing
Solution Approach 1:
The patent introduces a timing parameter (T_delta or N_delta) as an intermediary to bridge the gap between uplink receiving timing and downlink transmitting timing. This intermediary parameter simplifies the determination process by providing a direct reference value that accounts for the timing offset, eliminating the need for complex calculations involving both timing advances and offset adjustments.
Solution Approach 2:
The patent changes the timing parameter from a calculated value based on multiple components (TA/2 + offset) to a directly determined value (T_delta or N_delta). This parameter change simplifies the determination process while maintaining timing alignment accuracy, as the new parameter directly represents the required timing adjustment without needing to decompose it into multiple components.
2Power
If more antenna elements are accommodated per unit area in high-frequency communication, then antenna gain is improved through beamforming, but the coverage performance deteriorates due to larger free-propagation loss and rain attenuation
Solution Approach 1:
The patent applies preliminary action by advancing the downlink transmitting timing before the actual transmission occurs. This timing advance compensates for the propagation delay and ensures that the signal arrives at the intended destination at the correct time, thereby maintaining coverage performance despite the higher frequency and associated losses.
Solution Approach 2:
The patent employs feedback mechanisms where the timing parameter (T_delta or N_delta) is determined based on measured or configured timing information from the network. This feedback loop allows the system to continuously adjust and optimize timing alignment, compensating for the deteriorating coverage performance caused by high-frequency propagation losses.
Data Source
AI summary
Provided are a time difference determination method, an electronic device, and a storage medium. The time difference determination method includes determining a time difference according to at least one of a first-type parameter or a second-type parameter. The first-type parameter include at least one of a timing advance NTA or a first timing advance offset NTA,offset. The second-type parameter include at least one of a timing parameter index Tdelta, a timing parameter reference Ndelta, or a timing parameter granularity Gstep.