Rate Matching for Wireless Carrier Aggregation Timing
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Solution Overview
Problem
In wireless communication systems, especially in carrier aggregation environments, efficiently managing multiple uplink transmission timings is challenging due to interference and orthogonality issues between subcarriers, particularly in inter-band carrier aggregation scenarios where uplink transmission timings differ significantly between cells.
Innovation Solution
Implementing rate matching for PUSCH and/or PUCCH transmissions to adjust the effective channel coding rate and reduce the number of physical resource elements, thereby minimizing interference and maintaining orthogonality between subcarriers by performing rate matching for SC-FDMA symbols within a subframe.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If rate matching is performed for a fixed number of symbols in all cells, then resource allocation is simplified, but transmission timing differences between cells cause interference and loss of orthogonality
Solution Approach 1:
The patent applies dynamics by making the rate matching configuration adaptive rather than fixed. The network configures different numbers of rate matching symbols for different cells based on their specific uplink transmission timing characteristics. This dynamic adaptation allows the system to maintain signal orthogonality across cells with timing differences while managing resource allocation complexity through structured configuration parameters.
2Reliability
If uplink transmission timing is synchronized across all cells, then orthogonality is maintained, but flexibility in handling inter-band carrier aggregation scenarios is reduced
Solution Approach 1:
The patent applies local quality by allowing different rate matching configurations for different cells within the same carrier aggregation setup. Each cell can have its own number of rate matching symbols configured according to its specific timing characteristics and band requirements. This enables the system to maintain orthogonality locally in each cell while providing overall flexibility for inter-band carrier aggregation scenarios.
3Quantity of substance
If rate matching is not performed, then resource utilization is maximized, but interference between subcarriers increases and signal quality deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the number of rate matching symbols performed in each cell based on timing differences and interference conditions. Rather than applying rate matching uniformly or not at all, the system modifies this parameter selectively for different cells and subframes, optimizing the balance between resource utilization and interference mitigation according to actual transmission conditions.
Data Source
AI summary
The present invention relates to a wireless communication system and more specifically relates to a method and device for transmitting information. A wireless communication system can support carrier aggregation (CA). In one aspect of the present invention, a method, in which a terminal transmits information to a base station in a wireless communication system, comprises the steps of: carrying out rate matching for a preset number of symbols in a subframe for transmitting first information on at least one serving cell formed in the terminal; and transmitting the first information from the subframe in which the rate matching has been carried out, to the base station. Therein, the uplink transmission timing of the one or more serving cells are different from one another, and the preset number is determined in accordance with the difference between the uplink transmission timings of the one or more serving cell.