Narrowband SIB Acquisition for MTC Coverage Enhancement
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently acquiring system information block (SIB) for machine type communication (MTC) devices, particularly in networks configured with Multimedia Broadcast Multicast Service (MBMS) or Multi-Broadcast Single Frequency Network (MBSFN), due to uncertainties in network bandwidth and mode, which affect coverage enhancements.
Innovation Solution
The method involves determining specific locations in time and frequency for receiving system information for MTC devices over a bundled transmission, dependent on the services supported by the device and whether it supports multicast broadcast media service (MBMS), using a narrowband search space within a wideband system, and transmitting this information accordingly to ensure effective communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If system information is transmitted using wideband transmissions in networks configured with MBMS or MBSFN, then network coverage is extended, but MTC devices with coverage enhancements cannot efficiently acquire SIB due to uncertainties in network bandwidth and mode
Solution Approach 1:
The patent segments the search space for SIB acquisition into narrowband regions within the wideband system. MTC devices perform initial acquisition in narrowband search spaces, which are then segmented into multiple occasions or repetitions. This segmentation allows devices to acquire SIB reliably through cumulative decoding across multiple narrowband opportunities without requiring full wideband capability, thus resolving the contradiction between reliability and device complexity.
Solution Approach 2:
The patent introduces a time dimension to the narrowband search space by distributing SIB transmissions across multiple time occasions or subframes. Instead of requiring a single wideband transmission, the SIB is transmitted repeatedly in narrowband across different time instances, allowing devices to accumulate signal energy and decode successfully. This dimensional transformation resolves the contradiction by maintaining reliability through temporal diversity while keeping device complexity low.
2Device complexity
If narrowband search spaces are used for MTC devices, then device complexity is reduced, but transmission efficiency and coverage enhancement are limited without proper bundling
Solution Approach 1:
The patent merges multiple narrowband SIB transmissions into a bundled transmission structure where the same SIB is transmitted across multiple narrowband occasions. Devices combine the received signals from these bundled transmissions through cumulative decoding to achieve successful acquisition. This merging approach maintains low device complexity by using narrowband signals while dramatically improving transmission efficiency and coverage through the combined energy of multiple transmissions.
Solution Approach 2:
The patent implements continuous transmission of the SIB across multiple narrowband occasions within the bundled structure. Rather than intermittent or single-shot transmissions, the SIB is continuously repeated across available narrowband resources until successful decoding. This continuity ensures that devices with varying channel conditions can eventually acquire the SIB, resolving the contradiction between low device complexity and high transmission efficiency.
3Reliability
If SIB transmission locations are not determined based on service capabilities, then network configuration flexibility is maintained, but coverage enhancement for specific device types cannot be optimized
Solution Approach 1:
The patent applies local quality by determining SIB transmission locations and narrowband search space configurations based on specific device service capabilities and MBMS support. Different device types receive tailored transmission configurations optimized for their requirements. This localized optimization achieves reliable coverage enhancement for MTC devices while maintaining overall network flexibility, as the configuration is adapted locally rather than uniformly applied network-wide.
Solution Approach 2:
The patent introduces dynamic adaptation where the network determines and configures narrowband search space locations based on device service capabilities and MBMS configuration. The system dynamically adjusts transmission parameters and locations to match device requirements, enabling coverage enhancement for capability-matched devices while preserving network flexibility through capability-based differentiation rather than rigid fixed configurations.
Data Source
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AI summary
Aspects of the present disclosure provided techniques that for wireless communications by a user equipment (UE). An exemplary method, performed by a UE, generally includes determining one or more locations for receiving system information for machine type communication (MTC) over a bundled transmission and decoding the system information received at the locations over the bundled transmission.