Two-Part System Information Broadcast for Wireless Networks
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Solution Overview
Problem
Conventional wireless communication networks face inefficiencies in broadcasting system information due to the need to reach a large number of devices with varying requirements, especially in future 5G networks that will support many smartphones and machine-type communication devices, which increases resource usage in terms of time slots, frequency, and transmit power.
Innovation Solution
The method involves broadcasting system information in two parts: a first part with high energy per bit for all devices and a second part with lower energy per bit, transmitted only in response to request signals from devices that did not receive the first part, allowing for targeted and efficient resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If system information is broadcast with constant high power and high periodicity to reach all UEs, then all UEs can receive the signals reliably, but resource usage (time slots, frequency, transmit power) increases significantly
Solution Approach 1:
The system information is divided into two parts: a first part (SIP1) that is broadcast to all UEs with high power, and a second part (SIP2) that is transmitted only to UEs that request it. This segmentation allows the network to reduce overall transmit power while ensuring that critical information reaches all devices, and detailed information is provided only to those who need it.
Solution Approach 2:
Different transmit power levels are applied to different parts of the system information based on the local needs of UEs. The first part uses high power for universal coverage, while the second part uses lower power targeted at specific requesting UEs, optimizing energy usage according to local demand.
2Speed
If system information is broadcast to all UEs with high periodicity, then all UEs can access the network timely, but bandwidth usage increases
Solution Approach 1:
System information is segmented into SIP1 (broadcast to all) and SIP2 (transmitted on demand). This allows the network to maintain high periodicity for SIP1 to ensure timely access for all UEs, while reducing bandwidth consumption by transmitting SIP2 only when requested by specific devices.
Solution Approach 2:
The first part of system information is transmitted periodically to all UEs to ensure timely access, while the second part is transmitted aperiodically based on UE requests. This combination maintains access speed for critical information while reducing overall bandwidth usage.
3Adaptability or versatility
If system information is transmitted to support both smartphones and MTC devices with the same broadcast, then all device types can be served, but resource allocation becomes inefficient
Solution Approach 1:
The first part of system information serves as a universal message that all device types (smartphones and MTC devices) can receive and use for basic network access. The second part provides device-specific information transmitted only to devices that request it, allowing the system to serve multiple device types efficiently with a single broadcast mechanism.
Solution Approach 2:
Different quality levels of system information are provided to different device types based on their specific needs. All devices receive the essential first part, while smartphones that require additional services receive the enhanced second part, optimizing resource allocation according to each device's capabilities and requirements.
Data Source
AI summary
The present disclosure provides methods and apparatus for a wireless communications network in which system information can be provided on an efficient basis to mobile devices in the network. The system information is split into two parts, with the second part being transmitted to mobile devices in response to receipt of one or more request signals from those mobile devices. The second system information part may additionally be broadcast.