LTE Subframe Determination for Enhanced MIB and SIB Transmission
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Solution Overview
Problem
In LTE networks, especially in basement scenarios or poor channel quality conditions, user equipment (UE) faces challenges in learning TDD configurations and MBSFN subframe configurations before receiving SIB 1 and SIB 2, leading to unreliable transmission of initial information due to undefined subframes for enhanced transmission.
Innovation Solution
Determining specific subframes for enhanced transmission of first information, such as MIB, SIB 1, and other system information, and skipping CSI-RS transmission on resource elements occupied by these transmissions to avoid collisions, thereby ensuring reliable communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If enhanced transmission is performed on first information (MIB, SIB 1, or SIB with TDD/MBSFN configuration) before UE learns the configuration, then transmission reliability is improved through multiple transmissions, but the subframe used for enhanced transmission cannot be determined, leading to collision with CSI-RS transmission
Solution Approach 1:
The patent applies preliminary action by pre-configuring and indicating to the UE the subframe(s) that will be used for enhanced transmission of critical information (MIB, SIB1, or SIB containing TDD/MBSFN configuration) before the UE actually receives and decodes these messages. The base station determines and signals the enhanced transmission subframe index to the UE in advance, allowing the UE to know where to expect repeated transmissions and avoid collision with CSI-RS. This resolves the contradiction by enabling reliable enhanced transmission while maintaining simple subframe determination through pre-specified indexing.
2Reliability
If multiple transmissions of first information are performed in enhanced transmission, then transmission reliability is improved, but collision with CSI-RS transmission occurs when subframe cannot be determined
Solution Approach 1:
The patent applies the taking out principle by extracting and isolating the enhanced transmission of critical information from the normal transmission timeline. By specifying particular subframes (indicated by subframe index) dedicated solely to enhanced transmission of MIB, SIB1, or configuration SIBs, the patent removes these transmissions from potential collision with CSI-RS in other subframes. The base station ensures that CSI-RS is not transmitted in the indicated enhanced transmission subframes, effectively separating the two transmission types in time domain to prevent information loss due to collision.
3Loss of information
If TDD configuration and MBSFN subframe configuration are included in SIB 1 and SIB 2, then system information completeness is improved, but UE cannot learn these configurations before receiving SIB 1 and SIB 2, creating a chicken-and-egg problem
Solution Approach 1:
The patent resolves the chicken-and-egg problem by applying preliminary action: the base station performs enhanced transmission of the SIB containing TDD or MBSFN configuration in predetermined subframes before the UE needs to use these configurations. The UE is indicated in advance which subframes will contain enhanced transmission of configuration information, allowing the UE to acquire these critical configurations early in the cell access process, before needing to properly interpret TDD or MBSFN subframe structures. This ensures system information completeness is achieved while maintaining ease of operation through pre-specified transmission timing.
Data Source
AI summary
Embodiments of the present invention relate to the communications field, and provide an information transmission method, apparatus, and system, which determine a subframe used in enhanced transmission of first information, improving transmission reliability of the first information. The information transmission method includes: determining a subframe for enhanced transmission of first information, where the first information is a master information block, or the first information is a system information block (SIB) including a time division duplex (TDD) configuration, or the first information is an SIB including a multicast-broadcast single-frequency network (MBSFN) subframe configuration; and performing the enhanced transmission of the first information in the determined subframe for the enhanced transmission of the first information.