On-Demand System Information Transmission for Wireless Networks
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Solution Overview
Problem
Wireless communication systems with network-centric MAC layers continuously broadcast synchronization signals and system information, leading to power consumption and inefficiency, as not all UEs may need or use this information.
Innovation Solution
Implementing a UE-centric MAC layer where system information is transmitted on-demand by UEs, allowing them to request specific information, such as master system information for initial access and additional system information like available radio access technologies and services, reducing unnecessary broadcasts and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network continuously broadcasts synchronization signals and system information, then UEs can discover and access the network reliably, but power consumption increases and network resources are wasted
Solution Approach 1:
The network switches from continuous broadcasting to periodic broadcasting of synchronization signals and system information. This reduces power consumption and network resource usage while maintaining the ability for UEs to discover and access the network at regular intervals, thus resolving the contradiction between reliability and energy efficiency.
Solution Approach 2:
The system implements on-demand system information transmission where UEs can request specific system information when needed. The network only transmits the requested information, eliminating unnecessary broadcasts. This self-service mechanism reduces power consumption while maintaining access reliability, as UEs can obtain information only when they actually need it.
2Loss of information
If the network broadcasts all system information continuously, then UEs have access to complete information, but network resources are inefficiently utilized
Solution Approach 1:
The system extracts and transmits only the specific system information that UEs actually need, rather than broadcasting all system information continuously. UEs can request particular information elements, and the network transmits only those requested elements, thereby improving network resource efficiency while ensuring information availability when needed.
Solution Approach 2:
The network transmits system information periodically rather than continuously, allowing UEs to acquire information at regular intervals. This periodic transmission reduces network resource usage while maintaining information availability, resolving the contradiction between complete information access and resource efficiency.
3Adaptability or versatility
If the network transmits system information in broad-beam mode, then all UEs in coverage can receive it, but power consumption and resource usage increase
Solution Approach 1:
The system transitions from broad-beam transmission to targeted directional transmission of system information. Instead of broadcasting to all UEs in coverage uniformly, the network transmits system information specifically to UEs that have requested it, using directional beams. This reduces base station power consumption while maintaining information delivery to the intended recipients.
Solution Approach 2:
The system implements on-demand system information transmission where UEs request specific information and the network transmits only to those requesting UEs. This eliminates unnecessary broad-beam transmissions to UEs that don't need the information, reducing power consumption while maintaining adaptability through targeted delivery.
Data Source
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AI summary
Methods, systems, and devices are described for wireless communication. A first method includes receiving, at a user equipment (UE), a first set of system information; determining, based at least in part on the first set of system information, that additional system information is available; transmitting a request for the additional system information; and receiving the additional system information at the UE. A second method includes transmitting, from a base station, a first set of system information; receiving a request for additional system information; and transmitting the additional system information based at least in part on the request.