System Message Signaling for NB-LTE Spectrum Sharing
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Solution Overview
Problem
Existing technologies do not provide effective solutions to reduce interference between Narrowband Long Term Evolution (NB-LTE) and LTE systems during spectrum sharing, leading to simultaneous transmission of signals over the same resource and affecting data reception.
Innovation Solution
A system message transmission method that includes transmitting messages at a preset resource location, using a Physical Broadcast Channel (PBCH) and indicating available and unavailable resource elements through Cell-specific Reference Signal (CRS) and Channel State Information Reference Signal (CSI-RS) port locations, ensuring consistent data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If NB-LTE and LTE systems share the same spectrum, then spectrum utilization is improved, but interference between signals increases
Solution Approach 1:
The base station transmits system information messages in advance to indicate the time-frequency resources that will be occupied by LTE signals. This preliminary action allows NB-LTE terminals to know ahead of time which resources should be avoided, preventing simultaneous transmission and reducing interference before it occurs.
Solution Approach 2:
The patent introduces an intermediary mechanism where the base station uses reference signals (CRS and CSI-RS) as mediators to convey resource occupation information. These reference signals act as carriers that embed timing and frequency information about LTE resource usage, enabling NB-LTE terminals to interpret and avoid conflicting resources without direct signal coordination.
2Reliability
If system message transmission includes detailed resource information, then data reception reliability is improved, but message transmission complexity increases
Solution Approach 1:
The patent merges multiple types of information (system configuration, resource occupation timing, frequency location) into a single integrated system information message transmitted on the PBCH. This combining approach conveys comprehensive resource information without requiring separate message transmissions, thus improving reliability while controlling complexity.
Solution Approach 2:
The system information message serves multiple functions simultaneously: it conveys NB-LTE system configuration parameters, indicates LTE resource occupation patterns, and provides timing information for resource avoidance. This multi-functionality reduces the need for separate signaling messages, maintaining message simplicity while ensuring reliable data reception.
Data Source
AI summary
Provided are a system message transmission method and device, which relate to the field of wireless communications. According to the system message transmission method, a system message is transmitted at a preset resource location; and a physical downlink channel is transmitted according to the system message. The system message may include at least one of: frequency domain location information of a system, configuration information of a physical shared channel carrying a system message, configuration information of terminal access, available resource information of the physical downlink channel, and radio frame information.