TDD System Information Transmission Using MIB Resource Indication
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Solution Overview
Problem
Current radio access networks face challenges in efficiently transmitting system information in time-division duplexing (TDD) configurations, particularly in narrowband systems like NB-IoT, where limited downlink subframes are available due to shared carrier frequencies for downlink and uplink transmissions, leading to complexity and interference issues with mobile broadband systems.
Innovation Solution
A method and device for transmitting and receiving system information in TDD communication systems, where a master information block (MIB) indicates a spectral resource for a system information block (SIB), allowing flexible transmission on either an anchor or non-anchor carrier, reducing signaling overhead and design complexity by using a few bits in the MIB to indicate the spectral resource, enabling operation in various uplink-downlink TDD configurations and deployments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If TDD configuration is used to share carrier frequency for downlink and uplink transmissions, then spectrum efficiency is improved, but available downlink subframes for system information broadcasting are reduced
Solution Approach 1:
The patent segments the downlink subframes into different types: some subframes are dedicated to synchronization signals and MIB broadcasting, while other subframes are allocated for system information blocks (SIBs). This segmentation allows the system to maintain TDD efficiency while ensuring sufficient dedicated time for critical system information transmission.
Solution Approach 2:
The patent applies preliminary action by broadcasting the MIB in advance, which contains scheduling information for SIBs. This preliminary MIB transmission enables UEs to prepare and efficiently locate subsequent SIB transmissions, optimizing the time utilization in TDD configurations.
2Reliability
If multiple downlink subframes are allocated for system information broadcasting, then system information transmission reliability is improved, but available subframes for user traffic are reduced
Solution Approach 1:
The patent segments system information transmission into two phases: initial MIB broadcasting in dedicated subframes for reliability, and subsequent SIB transmissions in scheduled subframes that can be optimized for traffic capacity. This segmentation ensures critical information is reliably transmitted while allowing flexible allocation of remaining subframes for user traffic.
3Adaptability or versatility
If different MIB-NB formats are used for different uplink-downlink TDD configurations, then system adaptability is improved, but device complexity increases
Solution Approach 1:
The patent implements universality by defining a unified MIB-NB format that can serve multiple uplink-downlink TDD configurations. This single format provides multi-functionality, enabling the same MIB structure to adapt to different TDD settings without requiring separate formats for each configuration, thereby reducing device complexity while maintaining system adaptability.
Data Source
AI summary
A technique for transmitting system information for a time-division duplex, TDD, communication in a radio access network, RAN, is described. As to a method aspect of the technique, a master information block, MIB, is transmitted on an anchor carrier (602 1) of the TDD communication in the RAN. The MIB is indicative of a spectral resource (602-1; 602-2) allocated to a system information block, SIB, of the TDD communication in the RAN. The SIB is transmitted on the spectral resource (602-1; 602-2) indicated in the MIB.