Cell Wake-Up Signal Resource Selection for Low-Latency NR Sleep Modes
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Solution Overview
Problem
Existing wireless communication networks face challenges in achieving network energy efficiency and power savings, particularly in advanced technologies like NR, due to increased energy consumption and emissions, despite improvements in energy efficiency per gigabyte.
Innovation Solution
Implementing cell wake-up signal (C-WUS) triggering and resource selection mechanisms in user equipment (UE) and network nodes, where C-WUS configuration information is exchanged to enable efficient transmission of C-WUS based on specific conditions, such as uplink data availability or downlink signal quality, allowing for reduced network activity and optimized resource use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If network nodes operate continuously to maintain low latency for uplink traffic, then latency is reduced, but energy consumption increases
Solution Approach 1:
The network node transmits C-WUS configuration information to the UE in advance, enabling the UE to determine appropriate transmission resources before actual uplink traffic arrives. This preliminary setup allows the network node to enter sleep mode without incurring latency penalties, as the UE is pre-configured to transmit wake-up signals on designated resources when traffic arrives.
Solution Approach 2:
The C-WUS (Cell Wake-Up Signal) acts as an intermediary mechanism between the UE and the network node. When the UE has uplink traffic, it transmits a C-WUS on pre-configured resources to wake up the network node. This intermediary signal allows the network node to sleep efficiently while maintaining the ability to respond quickly to actual traffic, resolving the contradiction between energy saving and latency.
2Productivity
If network nodes remain in active state to handle traffic quickly, then service responsiveness is improved, but network energy efficiency deteriorates
Solution Approach 1:
The network node alternates between active and sleep states periodically. During sleep states, the node conserves energy. When the UE has uplink traffic, it transmits a C-WUS on pre-configured resources to wake up the network node. This periodic operation pattern maintains service responsiveness while significantly improving network energy efficiency.
3Loss of time
If C-WUS transmission resources are allocated frequently to ensure low latency, then latency is reduced, but signaling overhead increases
Solution Approach 1:
The C-WUS configuration information, including time-frequency resource allocations, is transmitted to the UE in advance during connected mode or via system information. This preliminary configuration eliminates the need for frequent dynamic resource allocation signaling, reducing overhead while ensuring low latency when traffic arrives, as the UE can immediately use pre-configured resources.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, cell wake-up signal (C-WUS) configuration information indicating C-WUS resources configured for one or more C-WUS monitoring occasions. The UE may detect whether a C-WUS triggering condition is satisfied. The UE, in connection with the C-WUS condition being satisfied, may transmit a C-WUS via at least one C-WUS resource, selected from the C-WUS resources configured for a C-WUS monitoring occasion. The at least one C-WUS resource may be associated with a C-WUS resource selection parameter. Particular aspects of the subject matter described herein can be implemented to realize one or more of the following potential advantages. In some examples, the described techniques can be used to increase network energy efficiency and network power savings.