PDSCH Frequency Offset Allocation Across Consecutive Time Slots
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Solution Overview
Problem
PDSCH transmission in non-ideal channel environments experiences reduced demodulation success due to channel fading caused by multipath effects, as resources are allocated at the same frequency domain positions in consecutive time slots.
Innovation Solution
Determine a first frequency domain position in a first time slot and a second frequency domain position in subsequent time slots using a preset offset strategy, dispersing PDSCH resources across consecutive time slots to mitigate channel fading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If PDSCH uses the same time slot allocation for transmission in multiple consecutive time slots, then the complexity of resource allocation is reduced, but the channel gain decreases due to channel fading in the same frequency domain positions
Solution Approach 1:
The patent applies dynamics by making the frequency domain position of PDSCH resources variable across time slots. Specifically, the frequency domain position in the i-th time slot is determined by the formula: frequency position = base position + (i mod N) × offset, where N is the aggregation factor. This dynamic adjustment ensures that PDSCH resources are dispersed across different frequency positions in different time slots, avoiding channel fading at the same frequency position and improving demodulation success rate while maintaining manageable allocation complexity through a systematic pattern.
2Ease of operation
If PDSCH resources are allocated at the same frequency domain position in multiple consecutive time slots, then the resource allocation process is simplified, but the channel experiences fading in the same conditions reducing demodulation probability
Solution Approach 1:
The patent implements periodic action through the modular arithmetic operation (i mod N) in the frequency position calculation. This creates a periodic pattern where PDSCH resources cycle through different frequency positions across time slots. The periodic dispersion ensures that resources are systematically distributed across frequency domains, avoiding persistent channel fading while maintaining a regular, predictable allocation pattern that simplifies the overall process.
Solution Approach 2:
The patent applies dynamics by making the frequency domain position of PDSCH resources variable across time slots. Specifically, the frequency domain position in the i-th time slot is determined by the formula: frequency position = base position + (i mod N) × offset, where N is the aggregation factor. This dynamic adjustment ensures that PDSCH resources are dispersed across different frequency positions in different time slots, avoiding channel fading at the same frequency position and improving demodulation success rate while maintaining manageable allocation complexity through a systematic pattern.
3Reliability
If time slot aggregation is configured for PDSCH transmission, then the coverage and reliability are improved under non-ideal conditions, but the channel fading at same frequency positions reduces the probability of successful demodulation
Solution Approach 1:
The patent applies dimensionality change by introducing frequency domain diversity to the time slot aggregation scheme. While time slot aggregation operates in the time dimension, the patent adds frequency domain variation through the formula: frequency position = base position + (i mod N) × offset. This creates a two-dimensional resource allocation strategy (time × frequency) that combats channel fading by ensuring that if fading occurs at certain frequency positions in some time slots, other frequency positions in other time slots will likely have better channel conditions, thereby improving overall demodulation success probability.
Data Source
AI summary
A resource allocation method, a terminal (300, 400), and a storage medium. The method comprises: determining a first frequency domain position of a resource in a first time slot among a plurality of aggregated consecutive time slots (101); determining a second frequency domain position of a resource in a second time slot after the first time slot according to the first frequency domain position and a preset frequency domain position offset policy (102); and allocating a PDSCH resource to a terminal according to the frequency domain position of a resource in each time slot among the plurality of consecutive time slots (103).