Narrowband Subframe Availability for MTC Wireless Communication
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Solution Overview
Problem
Wireless communication systems face challenges in efficiently managing subframe availability for machine-type communication (MTC) devices, particularly in narrowband regions, due to varying channel configurations and overlapping signals, which affect data transmission rates and resource allocation.
Innovation Solution
The method involves determining subframe availability in multiple narrowband regions by analyzing channel configurations, including reference signals, and adjusting transmission strategies such as TTI bundling and frequency hopping based on these determinations to optimize communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If MTC devices operate in narrowband regions with varying channel configurations, then communication flexibility is improved, but subframe availability and data transmission rates deteriorate due to signal overlaps and reference signal interruptions
Solution Approach 1:
The patent segments the carrier bandwidth into multiple narrowband regions (e.g., first narrowband region, second narrowband region) with different subframe availability characteristics. Each narrowband region can be independently configured and selected based on channel conditions and traffic requirements, allowing MTC devices to operate in regions with higher availability while maintaining overall system flexibility.
Solution Approach 2:
The patent implements dynamic subframe availability determination where the availability of subframes in narrowband regions changes based on channel configuration, reference signal positions, and traffic type (unicast/broadcast). The system dynamically selects appropriate narrowband regions and subframes for communication, optimizing data transmission rates according to real-time conditions.
2Productivity
If reference signals and channels occupy only a portion of the overall frequency range, then resource allocation efficiency is improved, but subframe availability for MTC communications deteriorates due to overlapping signals
Solution Approach 1:
The patent applies local quality by determining subframe availability independently for each narrowband region based on local channel configurations and reference signal positions. Different narrowband regions may have different availability patterns, allowing MTC devices to select regions with higher local availability while the base station efficiently allocates resources across the entire frequency range.
Solution Approach 2:
The patent introduces subframe availability determination as an intermediary mechanism between resource allocation and actual communication. This intermediary layer analyzes channel configurations, reference signal positions, and traffic requirements to identify suitable subframes and narrowband regions, resolving the conflict between resource allocation efficiency and subframe availability.
3Reliability
If TTI bundling and frequency hopping are used to enhance communication, then reliability is improved, but device complexity and processing requirements worsen
Solution Approach 1:
The patent determines subframe availability in advance before initiating TTI bundling or frequency hopping operations. By pre-identifying suitable subframes and narrowband regions with high availability, the system reduces the complexity of real-time processing during actual communication, as the low-complexity MTC devices do not need to perform complex availability assessments during active transmission.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A user equipment (UE) and a base station may establish a communication link over a carrier including multiple narrowband regions. One or both of the devices may determine a subframe availability associated with each of the narrowband regions and may communicate on one or more of the regions according to the availability. In some cases, the availability may depend on a channel configuration, such as the presence of reference signals (e.g., positioning reference signals (PRS) or discovery reference singles (DRS)) covering a portion of the overall bandwidth of the carrier. In some cases, transmission time interval (TTI) bundling or frequency hopping may depend on the subframe availability.