SDT Channel Reporting for Inactive UE MCS Adaptation
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Solution Overview
Problem
In wireless communications systems, network entities are unaware of the actual channel quality of user equipment (UE) during small data transmission (SDT) operations, leading to inefficient modulation and coding scheme (MCS) updates and increased power consumption due to suboptimal RSRP thresholds and lack of updated channel information.
Innovation Solution
UEs transmit current channel information, such as initial or updated RSRP, to network entities during SDT sessions using differential values and reduced bit reporting, enabling network entities to adjust MCS and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If UEs remain in inactive mode without transmitting channel information, then power consumption is reduced, but transmission efficiency deteriorates due to suboptimal MCS settings
Solution Approach 1:
The patent applies partial action by having UEs transmit channel information selectively rather than continuously. UEs in inactive mode transmit channel quality indicators only when specific conditions are met (e.g., channel quality changes exceed a threshold, or periodic reporting is configured), thereby reducing power consumption while still providing sufficient information for MCS optimization at the network entity
Solution Approach 2:
The patent implements feedback mechanisms where UEs transmit channel quality information (such as RSRP measurements or CQI) to the network entity during inactive mode. The network entity uses this feedback to dynamically adjust MCS settings for subsequent transmissions, improving transmission efficiency without requiring the UE to transition to connected mode and consume additional power
2Productivity
If UEs transmit detailed channel information frequently, then MCS optimization improves, but power consumption increases due to additional transmissions
Solution Approach 1:
The patent employs partial action by transmitting only essential channel information at reduced granularity. Instead of sending comprehensive channel state information, the UE transmits condensed metrics such as differential RSRP values or limited CQI reports, achieving sufficient MCS optimization while minimizing the power cost of transmissions
Solution Approach 2:
The patent changes the parameters of channel information reporting by using differential encoding (reporting changes in RSRP relative to a reference) and reducing reporting frequency or detail level. This allows the network entity to maintain accurate MCS settings while the UE consumes less power due to shorter, less frequent transmissions
3Use of energy by moving object
If UEs use reduced bit reporting for channel information, then power consumption decreases, but measurement precision deteriorates
Solution Approach 1:
The patent applies parameter changes by using differential encoding where the UE reports the difference in RSRP relative to a previously reported value or a configured reference. This differential approach maintains precision for MCS determination while reducing the number of bits required for transmission, thereby lowering power consumption
Solution Approach 2:
The patent transitions from reporting absolute channel quality values to reporting relative changes or differential values. This dimensional change in the reporting metric allows the system to capture essential channel variations with fewer bits, reducing transmission power requirements while preserving the precision needed for effective MCS optimization
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. In some cases, a user equipment (UE), in an inactive mode, may initiate a small data transmission (SDT) session based on a size of an uplink payload being less than a threshold size and based on an initial channel quality associated with a communication link between the UE and a network entity satisfying (e.g., meeting or exceeding) a threshold channel quality. In such cases, the UE may transmit, during the SDT session while in the inactive mode, an uplink message indicative of current channel information associated with the UE. Additionally, the UE may receive a control message indicative of one or more communication parameters associated with the UE, where the one or more communication parameters are based on the current channel information associated with the UE.