Variable Frequency Allocation Switching for eMTC Uplink Capacity
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Solution Overview
Problem
Current eMTC technology is limited by the minimum frequency allocation for uplink data transmissions, which restricts the number of UEs that can transmit simultaneously, and faces challenges in deep coverage scenarios due to limited power resources and spectral inefficiencies.
Innovation Solution
The implementation of a variable frequency allocation method that switches between RB sized and sub RB sized frequency allocations for UL data transmissions, allowing for more efficient use of spectral resources and power management, enabling more UEs to transmit simultaneously without degrading data rates, especially in deep coverage scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RB sized frequency allocation is used for UL data transmissions, then each UE can maintain reliable data transmission, but the number of UEs that can transmit simultaneously is limited
Solution Approach 1:
The patent segments the Resource Block (RB) into smaller sub-RBs, allowing frequency allocations smaller than a full RB. This segmentation enables multiple UEs to be allocated different sub-RBs within the same RB, thereby increasing the number of simultaneous transmissions while maintaining reliable connectivity for each UE through dedicated frequency resources.
2Device complexity
If narrowband bandwidth is reduced to support low cost devices, then device complexity is reduced, but spectral efficiency deteriorates
Solution Approach 1:
The patent introduces dynamic frequency allocation where the network can flexibly assign sub-RB sized allocations to different UEs based on channel conditions, traffic demands, and coverage requirements. This dynamic approach allows the system to optimize spectral efficiency by allocating resources adaptively, rather than using fixed narrowband allocations, thereby improving overall system performance while maintaining support for low-cost devices.
3Use of energy by moving object
If power resources are reduced for low power operations, then device power consumption is reduced, but transmission reliability in deep coverage scenarios deteriorates
Solution Approach 1:
The patent applies local quality by allocating different frequency resources (sub-RBs) to different UEs based on their specific coverage requirements. UEs in deep coverage scenarios can be allocated sub-RBs with better channel conditions, while UEs in good coverage use standard allocations. This localized optimization allows each UE to achieve reliable transmission with minimized power consumption tailored to its specific operational context.
Data Source
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AI summary
Enhanced Machine Type Communications (eMTC) is a wireless communication technology with reduced system bandwidth. To improve spectral efficiency, user equipment (UE) is configured to receive first downlink control information (DCI) from a base station. The first DCI indicates a resource block (RB) sized frequency allocation for the UE. Additionally, the UE is configured to receive second DCI from the base station. The second DCI indicates a sub RB sized frequency allocation for the UE. The UE is configured to transmit a plurality of uplink data transmissions to the base station in a variable frequency allocation such that the plurality of uplink data transmissions switches between using the RB sized frequency allocation and the sub RB sized frequency allocation. Thus, by using the sub RB sized frequency allocation, more UEs can be allocated to the same RB without lowering the data rate thereby improving total uplink capacity.