Subband Rank Indicator Segmentation for Wireless Throughput
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Solution Overview
Problem
In high bandwidth scenarios, the use of a common rank indicator for all subbands in 3GPP LTE R10 systems leads to poor data transmission performance due to insufficient satisfaction of different subband requirements, resulting in deteriorated system performance.
Innovation Solution
The method involves determining and using different rank indicators for each subband to determine transmission block sizes and mapping transmission blocks to corresponding layers, allowing for differential processing that maximizes performance across subbands, with the sending device sending control information to indicate rank, precoding matrix, and modulation and coding information for each subband.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common rank indicator is used for all subbands, then device complexity is reduced, but data transmission performance deteriorates
Solution Approach 1:
The patent divides the bandwidth into multiple subbands and assigns different rank indicators to each subband. The sending device determines rank indicators for J subbands (where J≥2) based on channel quality measurement, allowing each subband to have independent rank indication. This segmentation enables differentiated transmission processing for different subbands, resolving the contradiction between simplified processing and transmission performance.
Solution Approach 2:
The patent applies local quality by allowing different parts of the bandwidth (subbands) to have different rank indicators tailored to their specific channel conditions. Each subband's rank indicator is determined independently based on local channel quality measurement, enabling optimal transmission parameters to be applied locally to each subband rather than using a uniform approach across the entire bandwidth.
2Productivity
If different rank indicators are used for different subbands, then data transmission performance is improved, but device complexity increases
Solution Approach 1:
The patent segments the bandwidth into J subbands (J≥2) and determines rank indicators for each subband independently. The sending device performs channel quality measurement on each subband and determines appropriate rank indicators based on the measurement results. This segmentation approach enables performance improvement by tailoring transmission to local conditions while managing complexity through systematic processing of divided subbands.
Solution Approach 2:
The patent changes the parameter of rank indicator from a single common value to multiple subband-specific values. By determining rank indicators for different subbands based on channel quality measurement, the system dynamically adjusts transmission parameters (such as transmission block size and quantity of transmission layers) to match local channel conditions, thereby improving performance while the complexity increase is managed through parameter adaptation.
3Productivity
If subband-specific transmission processing is implemented, then system throughput is improved, but signaling overhead increases
Solution Approach 1:
The patent segments the bandwidth into subbands and implements differential transmission processing for each subband based on determined rank indicators. The sending device maps transmission blocks to transmission layers differently for each subband according to its rank indicator, enabling improved system throughput through localized optimization while managing signaling overhead through efficient resource allocation.
Solution Approach 2:
The patent applies local quality by implementing transmission processing tailored to each subband's characteristics. The sending device determines transmission block size and quantity of transmission layers independently for each subband based on its rank indicator, allowing optimal transmission parameters to be applied locally. This approach improves system throughput by matching transmission characteristics to local channel conditions while avoiding the need for extensive signaling through intelligent parameter selection.
Data Source
AI summary
Embodiments of the present invention relate to the communications field, and provide a data transmission method, a sending device, and a receiving device. Transmission requirements of different subbands can be maximally satisfied, and a system throughput can be improved. The method includes: determining, by a sending device, rank indicators of J (an integer greater than or equal to 1) subbands corresponding to a to-be-transmitted channel, where the rank indicators of the J subbands are not totally the same; determining, by the sending device based on a rank indicator of each of the J subbands, a transmission block size.