Segmented System Information Transmission for Flexible 5G Access
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Solution Overview
Problem
The existing LTE system faces high overhead and poor flexibility in system information transmission, which is inadequate for the diverse service requirements of 5G networks, particularly in scenarios with ultrahigh traffic density and mobility, and lacks forward compatibility for varying service demands.
Innovation Solution
A method and device for generating and transmitting first system information that includes indication information for accessing second system information, allowing flexible adaptation to different service requirements by reducing broadcast control overhead and enhancing system design compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the PBCH is used for system information transmission every 10 ms, then the system information can be transmitted regularly, but the overhead is high and flexibility is poor
Solution Approach 1:
The system information is segmented into two parts: part 1 is transmitted periodically via PBCH every 10 ms to ensure reliability, while part 2 is transmitted aperiodically via PDSCH when needed. This segmentation allows the system to maintain reliable periodic transmission while reducing overall overhead by avoiding unnecessary periodic transmissions of complete system information.
Solution Approach 2:
The patent introduces dynamic indication information (such as DCI format 2_6) that dynamically indicates whether system information part 2 needs to be transmitted. This dynamic mechanism allows the system to adapt transmission behavior to actual needs, reducing overhead when system information remains unchanged while maintaining reliability when updates are required.
2Ease of manufacture
If the LTE system uses fixed transmission periodicity for PBCH, then the transmission is simple to implement, but the flexibility for diverse 5G service requirements is poor
Solution Approach 1:
System information is divided into part 1 (transmitted periodically via PBCH) and part 2 (transmitted aperiodically via PDSCH). This segmentation enables the system to maintain simple periodic transmission for critical information while using aperiodic transmission for service-specific information, thereby achieving both implementation simplicity and service adaptability.
Solution Approach 2:
The PDSCH channel is used for multiple purposes: transmitting system information part 2, carrying indication information about system information updates, and supporting diverse 5G services. This multi-functionality allows a single channel to serve both legacy simplicity requirements and new service adaptability needs.
3Ease of operation
If all system information is transmitted through BCH, then the transmission is straightforward, but the overhead is high and it cannot meet diverse service demands
Solution Approach 1:
The patent extracts system information part 2 from the periodic BCH transmission and places it in PDSCH transmission. This extraction removes unnecessary overhead from periodic broadcasts while maintaining the ability to transmit required system information on-demand, thereby reducing overhead while preserving operational simplicity for critical information.
Solution Approach 2:
DCI format 2_6 acts as an intermediary that carries indication information about system information updates. This intermediary mechanism allows the system to efficiently signal when system information changes without requiring full periodic retransmission, reducing overhead while maintaining ease of operation through standardized indication protocols.
Data Source
AI summary
A system information transmission method and device. The system information transmission method comprises: generating, by a first communication node, first system information indicative of indication information corresponding to second system information, wherein the second system information is used to assist a second communication node to access a system; transmitting to the second communication node the first system information; receiving, by the second communication node, the first system information transmitted from the first communication node; receiving, according to the indication information in the first system information, the second system information; and accessing, according to the second system information, the system.