Adaptive PBCH Repetition for MTC Coverage
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Solution Overview
Problem
Wireless communication systems face challenges in providing effective coverage to low-complexity, low-cost devices like machine type communication (MTC) devices due to limited radio capabilities, leading to packet loss and service disruptions when using the same repetition levels as other devices.
Innovation Solution
A base station selects a repetition level for the physical broadcast channel (PBCH) based on system configuration parameters, and user equipment (UE) identifies the system configuration to determine a suitable PBCH configuration, allowing for different repetition levels and resource usage based on whether the system is TDD or FDD, enhancing coverage for MTC devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same repetition level is used for all UEs, then system complexity is reduced, but coverage quality for MTC devices deteriorates
Solution Approach 1:
The patent applies local quality by configuring different PBCH repetition levels for different types of UEs. Specifically, MTC devices are assigned a first PBCH repetition level while non-MTC devices use a second PBCH repetition level, allowing each device type to receive appropriate coverage quality tailored to its specific requirements rather than using a uniform approach for all devices.
2Reliability
If higher repetition level is used for MTC devices, then coverage quality is improved, but resource consumption increases
Solution Approach 1:
The patent implements local quality by applying different repetition levels selectively to different device types. MTC devices receive higher repetition levels for improved coverage, while non-MTC devices use lower repetition levels, thereby optimizing resource consumption by not applying excessive repetition to all devices uniformly.
3Adaptability or versatility
If different PBCH configurations are used for TDD and FDD, then adaptability to different system types is improved, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by configuring PBCH repetition levels based on system duplexing mode. When the system operates in TDD mode, a first PBCH repetition level is configured, whereas in FDD mode, a second PBCH repetition level is configured. This allows the system to adapt to different operational modes while the UE simply follows the configured parameters without complex decision-making.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A base station may select a repetition level for a physical broadcast channel (PBCH) based on system configuration parameters. A user equipment (UE) may identify the system configuration. For example, the UE may assume a system bandwidth, assume a control region size, and determine whether the cell is a time division duplexing (TDD) or frequency division duplexing (FDD) cell. The UE may then determine a PBCH configuration based on the system configuration. For example, the PBCH repetition level may depend on the system configuration, such as whether a TDD or FDD scheme is employed. The UE may then receive a PBCH transmission according to the PBCH configuration. If a different cell has a different system configuration, the UE may determine a different PBCH configuration and receive PBCH using a different repetition level and different resources.