Uplink Shared-Channel UCI Multiplexing Across Variable Lengths
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Solution Overview
Problem
In wireless communications systems, multiplexing uplink control information (UCI) on uplink shared channels with varying transmission lengths leads to inconsistencies in coding schemes, making it difficult for base stations to combine and receive the UCI effectively.
Innovation Solution
A user equipment (UE) maintains the same rate-matching and coding scheme across UCI transmissions of different lengths by determining the actual lengths of the transmissions and multiplexing UCI accordingly, using a reference number of resource elements based on the scheduled length rather than the actual length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE uses different coding schemes for transmissions of different lengths, then the transmissions can be adapted to actual channel conditions, but the base station cannot effectively combine and receive the UCI from multiple repetitions
Solution Approach 1:
The patent applies homogeneity by ensuring that the same coding scheme is used across all uplink shared channel transmissions regardless of their length. This is achieved by determining the coding scheme based on the scheduled transmission length from the uplink grant rather than the actual transmission length, making the coding approach uniform across heterogeneous transmission scenarios.
Solution Approach 2:
The patent applies preliminary action by pre-determining the coding scheme and rate-matching parameters based on the scheduled transmission length before the actual transmission occurs. This preliminary determination ensures that the base station can properly combine transmissions even when actual lengths vary, as the coding parameters are established in advance based on the grant.
2Productivity
If the UE determines coding scheme based on actual transmission length, then the coding can be optimized for each transmission, but the base station cannot combine UCI from multiple repetitions with different coding schemes
Solution Approach 1:
The patent applies parameter changes by shifting the basis for determining coding scheme parameters from the actual transmission length to the scheduled transmission length. This parameter change allows the coding scheme to remain consistent across repetitions while still adapting to the granted resources, resolving the conflict between optimization and combinability.
3Adaptability or versatility
If the transmission length varies due to slot boundaries or channel conditions, then the transmissions can be flexibly scheduled, but the coding scheme consistency required for UCI combining is compromised
Solution Approach 1:
The patent applies preliminary action by establishing the coding scheme based on the scheduled length before transmissions occur. This preliminary determination of coding parameters based on the grant ensures consistency is maintained even when actual transmissions vary in length due to slot boundaries or channel conditions.
Solution Approach 2:
The patent applies homogeneity by using the scheduled transmission length as the uniform basis for determining coding schemes across all repetitions. This creates a consistent coding approach that remains stable despite variations in actual transmission lengths caused by scheduling flexibility requirements.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive an uplink grant that schedules uplink shared channel transmissions of a first length. The UE may then determine the actual lengths of the transmissions, which may differ from each other and the scheduled length (e.g., due to conditions of the communication environment, such as the location of slot boundaries). The UE may also identify uplink control information to be multiplexed on the uplink shared channel (e.g., when the scheduled transmission overlaps with a control channel or based on an uplink grant for the uplink control information). The UE may multiplex the uplink control information on the uplink shared channel so as to maintain the same rate-matching scheme and the same coding scheme for each of the transmissions, and transmit the uplink control information in at least one of the transmissions.