MBS UE Reception Control for Lower Power and PDCCH Load
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Solution Overview
Problem
Reduced-capability new radio (NR) devices (RedCap UEs) face increased load on the Physical Downlink Control Channel (PDCCH) due to high-density deployments, leading to potential congestion and signaling overhead, which is not efficiently addressed by existing technologies.
Innovation Solution
Implementing group scheduling of RedCap UEs using a new DCI format (DCI 2_X or DCI 2_Y) for aperiodic CSI reporting, where UEs are grouped together to receive a single command, reducing PDCCH load and signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If individual scheduling is used for each RedCap UE, then each UE receives dedicated service, but PDCCH load increases and congestion occurs
Solution Approach 1:
The patent merges multiple individual UE scheduling commands into a single group-common DCI that schedules resources for multiple RedCap UEs simultaneously. This combining approach maintains dedicated service quality for each UE while significantly reducing the number of individual PDCCH messages required, thereby alleviating PDCCH congestion and improving overall system productivity.
2Reliability
If frequent PDCCH monitoring is implemented, then communication reliability is maintained, but power consumption increases
Solution Approach 1:
The patent implements periodic CSI reporting where UEs report channel state information at predetermined intervals rather than continuously. This periodic action maintains communication reliability through regular updates while significantly reducing the frequency of PDCCH monitoring and processing, thereby lowering power consumption for RedCap UEs.
Solution Approach 2:
The patent enables UEs to autonomously determine when CSI reporting is needed based on channel conditions and configured parameters. Each UE self-manages its reporting timing and resource allocation without requiring constant network control, maintaining reliable communication while optimizing power consumption through self-adjusted periodic reporting cycles.
3Adaptability or versatility
If aperiodic CSI reporting is used, then resource allocation flexibility is improved, but signaling overhead increases
Solution Approach 1:
The patent combines multiple aperiodic CSI reporting commands into a single group-common DCI format (DCI 2_4 or DCI 2_5) that can schedule resources for multiple UEs simultaneously. This merging approach maintains the flexibility and adaptability of aperiodic reporting while significantly reducing the total signaling overhead compared to individual UE commands for each UE.
Solution Approach 2:
The patent creates a universal group-common DCI format that serves multiple functions: it can trigger aperiodic CSI reporting for different UE groups, allocate resources flexibly based on channel conditions, and manage multiple reporting occasions in a single message. This multi-functional approach maintains resource allocation flexibility while minimizing signaling overhead through consolidated control signaling.
Data Source
AI summary
A system and a method in a wireless communication network are disclosed to reduce a power consumption of a Multicast and Broadcast Services (MBS) device. The device includes an interface to the wireless communication network that receives wireless communications from the wireless communication network, and a controller. The controller controls the interface to receive unicast communications in a bandwidth part (BWP) of the wireless communication network and to receive MBS communications in a common frequency resource (CFR) of the wireless communications. The controller further controls the interface by selectively receiving MBS communications in the CFR to reduce a frequency bandwidth of the interface, or a combination thereof, to reduce a power consumption of the device.