Dynamic MCS Offset for UCI on Short TTI
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Solution Overview
Problem
In LTE systems, the existing methods for determining modulation and coding scheme (MCS) offset for uplink control information (UCI) on short physical uplink shared channels (PUSCH) with shortened transmission time intervals (TTIs) are inadequate, leading to suboptimal system throughput and UCI transmission reliability due to static or semi-static configurations that do not account for varying UCI and data payload sizes.
Innovation Solution
Dynamic or semi-dynamic configuration of the MCS offset for UCI on sPUSCH, based on the size of the UCI, data payload, their ratio, and expected interference levels, allowing for adaptive UCI coding rate adjustments and improved control over UCI transmission on sPUSCH.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If static or semi-static MCS offset configuration is used for UCI on sPUSCH, then device complexity is reduced, but UCI transmission reliability and system throughput deteriorate due to inability to adapt to varying payload sizes
Solution Approach 1:
The patent applies dynamics by transitioning from static/semi-static MCS offset configuration to dynamic MCS offset configuration. The network node now determines MCS offset values on a per-sTTI basis based on actual UCI and data payload sizes, allowing the system to adapt to varying transmission conditions and improve UCI transmission reliability without excessive complexity
Solution Approach 2:
The patent changes the parameter of MCS offset from fixed to variable. By determining MCS offset dynamically based on payload sizes and transmission conditions, the system optimizes the coding rate for UCI on sPUSCH, resolving the contradiction between configuration simplicity and transmission reliability
2Productivity
If dynamic MCS offset configuration is implemented for UCI on sPUSCH, then UCI transmission reliability and system throughput improve, but device complexity and signaling overhead increase
Solution Approach 1:
The patent changes MCS offset from static to dynamic parameter, determined based on payload sizes and transmission conditions. This enables optimal resource allocation and coding rate selection, improving system throughput while managing complexity through standardized determination procedures
Solution Approach 2:
The network node uses feedback information about payload sizes and transmission conditions to determine appropriate MCS offset values. This feedback mechanism enables adaptive optimization of UCI transmission on sPUSCH, improving throughput while keeping complexity manageable through rule-based determination
3Productivity
If MCS offset is adjusted based on varying payload sizes, then resource allocation efficiency improves, but measurement and determination difficulty increases
Solution Approach 1:
The network node determines payload sizes and selects MCS offset values in advance before actual transmission. This preliminary determination based on expected payload conditions enables efficient resource allocation while avoiding complex real-time measurements during transmission
Solution Approach 2:
The patent uses parameter changes in MCS offset based on payload size categories rather than exact measurements. By mapping payload sizes to discrete MCS offset values, the system improves resource allocation efficiency while reducing measurement and determination difficulty
Data Source
AI summary
According to some embodiments, a method in a network node comprises: determining that uplink control information, UCI, and a data payload will be sent via a physical uplink shared channel on a slot/subslot transmission; determining a modulation coding scheme, MCS, offset for transmission of the UCI via the physical uplink shared channel; and communicating the MCS offset to a wireless device. According to some embodiments, a method in a wireless device comprises: determining that UCI and a data payload will be sent via a physical uplink shared channel on a slot/subslot transmission; receiving a MCS offset for transmission of the UCI via the physical uplink shared channel; and communicating, to a network node, the UCI using the MCS offset. The UCI and the data payload may be sent via the physical uplink shared channel with a slot/subslot transmission or a short transmission time interval (sTTI).