Uplink Wakeup Signals for On-Demand SIB1 and RACH Access
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Solution Overview
Problem
Existing wireless communication networks face challenges in achieving network energy savings due to the continuous broadcasting of system information blocks, which leads to unnecessary power consumption, especially in low-activity periods.
Innovation Solution
Implementing an on-demand system information block transmission mechanism using an uplink wakeup signal (UL-WUS) and random access channel (RACH) configurations, allowing UEs to request SIB1 only when needed, with separate or shared configurations for UL-WUS and RACH occasions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If system information blocks are continuously broadcasted, then communication reliability is maintained, but network power consumption increases
Solution Approach 1:
The patent implements periodic broadcasting of system information blocks at reduced frequency rather than continuous broadcasting. The network broadcasts SIB1 only in specific periods (e.g., every 20ms instead of continuously), which reduces power consumption while maintaining communication reliability through periodic updates rather than constant transmission.
Solution Approach 2:
The patent introduces a feedback mechanism where user equipment sends wake-up signals to the network when system information block updates are needed. This feedback loop allows the network to adjust broadcasting frequency dynamically based on actual network conditions and user needs, reducing unnecessary transmissions and associated power consumption while maintaining reliability when updates are required.
2Use of energy by stationary object
If on-demand SIB1 transmission is implemented, then network power consumption is reduced, but device complexity increases
Solution Approach 1:
The patent segments the system information block transmission into different types: periodic SIB1 broadcasting and on-demand SIB1 transmission triggered by wake-up signals. This segmentation allows the network to use different transmission strategies for different scenarios, reducing overall power consumption while managing complexity through clear differentiation between transmission modes.
Solution Approach 2:
The patent introduces wake-up signals as intermediary elements between user equipment and the network. These wake-up signals act as mediators that trigger on-demand SIB1 transmissions only when necessary, reducing power consumption by avoiding unnecessary broadcasts while simplifying the overall system through a clear trigger-based mechanism rather than complex continuous negotiation protocols.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive an uplink wakeup signal (UL-WUS) configuration and a random access channel (RACH) configuration for a network energy savings (NES) cell, wherein the NES cell is associated with an on-demand system information block 1 (SIB1). The UE may transmit, to the NES cell, an UL-WUS in an UL-WUS occasion associated with the UL-WUS configuration, wherein the UL-WUS includes one or more of a request for the on-demand SIB1 or a request to start a RACH procedure. Numerous other aspects are described.