Restricted-Bandwidth PBCH Signaling for Low-Complexity MTC Access
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Solution Overview
Problem
Third and fourth generation mobile telecommunication networks require complex and expensive radio transceivers due to advanced data modulation techniques and wide bandwidth usage, which is not suitable for low-cost, low-complexity devices like MTC terminals.
Innovation Solution
A base station allocates radio resources using a host carrier with a subordinate carrier having a narrower frequency band, allowing differentiated access for MTC devices by reserving specific subframes and signaling the presence and characteristics of the subordinate carrier within a restricted bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If third and fourth generation mobile telecommunication networks use advanced data modulation techniques and wide bandwidth usage, then data rates and network capability are improved, but device complexity and cost increase
Solution Approach 1:
The patent segments the frequency bandwidth by introducing a subordinate carrier with a narrower frequency band within the host carrier's bandwidth. This allows MTC devices to operate on a restricted bandwidth portion (e.g., 5 MHz) while the host carrier utilizes the full bandwidth (e.g., 20 MHz), thereby reducing the complexity requirement for MTC device radio transceivers while maintaining high data rates for other services through the full bandwidth host carrier.
Solution Approach 2:
The patent applies local quality by providing differentiated access to different portions of the frequency spectrum. The subordinate carrier is configured with specific characteristics (narrower bandwidth, specific frequency location) that are optimized for MTC devices, while the host carrier maintains full bandwidth characteristics for other services. This allows each carrier to have quality characteristics matched to its intended usage.
2Adaptability or versatility
If third and fourth generation mobile telecommunication networks support wide bandwidth usage, then network coverage and capability are improved, but ease of manufacture for low-cost devices deteriorates
Solution Approach 1:
The patent segments the network support by creating a subordinate carrier that provides network coverage functionality specifically for MTC devices with restricted bandwidth capability. The host carrier continues to provide full network coverage using wide bandwidth, while the subordinate carrier ensures that low-cost MTC devices can access the network without requiring expensive wide-bandwidth radio transceivers.
Solution Approach 2:
The subordinate carrier acts as an intermediary between the full bandwidth host carrier and the low-cost MTC devices. It mediates the network interface for MTC devices, allowing them to access the LTE network through a simplified, narrower bandwidth channel rather than requiring direct compatibility with the full bandwidth host carrier.
3Device complexity
If MTC devices use restricted bandwidth, then device complexity is reduced, but resource allocation efficiency deteriorates
Solution Approach 1:
The patent segments time and frequency resources by allowing the base station to allocate specific time slots and frequency bands to the subordinate carrier. This segmentation enables efficient resource allocation where MTC devices utilize the restricted bandwidth resources during allocated time periods, while the host carrier utilizes remaining resources, maximizing overall system productivity.
Solution Approach 2:
The patent implements dynamic resource allocation where the base station can flexibly assign time slots and frequency resources to the subordinate carrier based on actual MTC device needs. This dynamic adjustment optimizes resource utilization efficiency while maintaining the restricted bandwidth characteristic for MTC devices.
Data Source
AI summary
A base station is configured to transmit a physical broadcast channel (PBCH) in a first bandwidth portion of a cell having a cell bandwidth. The PBCH having a master information block (MIB), wherein the MIB having a carrier flag and an indication of a second bandwidth portion of the cell and time resources to receive the second bandwidth portion. The base station is further configured to transmit in the indicated time resources, a signal in the second bandwidth portion of the cell based on a first value on the carrier flag and recover control information from the signal in the second bandwidth portion.