Uplink Control Information Multiplexing During DRX Inactive Periods
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Solution Overview
Problem
The implementation of cell discontinuous reception (DRX) in radio access networks introduces challenges in ensuring compatibility of uplink control information (UCI) with DRX inactive periods, leading to potential loss of UCI when multiplexed with data on physical uplink shared channels during inactive periods.
Innovation Solution
A method where user equipment determines physical uplink shared channels that overlap with DRX inactive times and excludes them from multiplexing with UCI, selecting alternative channels for UCI transmission based on priority, ensuring UCI is transmitted using either remaining physical uplink shared channels or the physical uplink control channel during inactive periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If UCI is multiplexed with data on PUSCH to reduce transmissions, then energy consumption is reduced, but UCI may be lost when PUSCH falls within DRX inactive period
Solution Approach 1:
The user equipment performs preliminary identification of PUSCH resources that overlap with DRX inactive periods before multiplexing UCI. By detecting these conflicting resources in advance and excluding them from multiplexing operations, the system ensures UCI is not transmitted during periods when the network cannot receive it, thus preventing UCI loss while still allowing multiplexing on compatible resources to reduce energy consumption.
2Loss of energy
If cell switches to DRX inactive state to reduce energy consumption, then energy consumption is greatly reduced, but reception of UL traffic cannot take place
Solution Approach 1:
The system dynamically adapts UCI transmission resources based on the DRX state. The user equipment identifies which PUSCH resources fall within inactive periods and adjusts multiplexing decisions accordingly. This dynamic adaptation allows the system to maximize energy savings during inactive periods while ensuring UCI transmission reliability by selecting appropriate resources that are active during DRX periods.
3Reliability
If UCI is transmitted on separate PUCCH channel to ensure reliability, then UCI transmission reliability is maintained, but number of transmissions increases
Solution Approach 1:
The system applies different transmission strategies to different PUSCH resources based on their temporal characteristics. PUSCH resources that do not overlap with DRX inactive periods are selected for UCI multiplexing, while those that do overlap are excluded. This localized quality approach allows multiplexing to be applied where beneficial (reducing transmissions) while maintaining reliability by avoiding conflicting resources.
Data Source
AI summary
There is provided a user equipment including means for: determining at least one physical uplink shared channel that overlaps at least in part in the time domain with a cell discontinuous reception inactive time period, the at least one physical uplink shared channel being part of a set of physical uplink shared channels; excluding the determined at least one physical uplink shared channel from multiplexing operations with uplink control information of a physical uplink control channel; and based on the excluding, determining a resource to use to transmit uplink control information to a network node.