eMTC Frequency Hopping Design for Contiguous Resource Allocation
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Solution Overview
Problem
Current wireless communication systems, particularly in enhanced machine type communications (eMTC), face challenges in efficiently allocating large bandwidths due to half-duplex operation and limited throughput, which restricts simultaneous uplink and downlink transmissions and results in suboptimal resource utilization.
Innovation Solution
The implementation of frequency hopping design for resource allocation in eMTC systems, where user equipment (UE) determines allocated frequency hopped resources within a system bandwidth based on configuration information, includes or excludes the center resource block, and removes edge resources to ensure contiguous allocations, thereby managing wrap-around issues and optimizing bandwidth usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frequency hopping is applied for large bandwidth allocation in eMTC, then bandwidth utilization efficiency is improved, but resource allocation complexity increases due to wrap-around issues and discontinuous resource distribution
Solution Approach 1:
The system bandwidth is divided into multiple subbands, and frequency hopping is applied across these subbands. This segmentation allows the UE to hop between different subbands while maintaining manageable resource allocation within each subband, thus improving overall bandwidth utilization without excessive complexity
Solution Approach 2:
The network configures frequency hopping parameters and resource allocation patterns in advance through RRC signaling. This preliminary configuration enables the UE to autonomously determine resource allocations without real-time complex calculations, reducing operational complexity while maintaining efficient bandwidth utilization
2Adaptability or versatility
If the center resource block is included in frequency hopped resources, then resource allocation flexibility is improved, but determining contiguous resources becomes more difficult due to wrap-around issues
Solution Approach 1:
The center resource block is treated with special local quality - when it falls within the frequency hopped resources, it is automatically included without requiring wrap-around handling. This local exception simplifies the determination of contiguous resources while maintaining allocation flexibility
Solution Approach 2:
The center resource block is extracted from the general frequency hopping calculation and handled separately. By removing it from the wrap-around problem, the system maintains flexibility in including it when needed while simplifying the overall resource determination process
3Ease of operation
If edge resources are removed to ensure contiguous allocation, then resource allocation simplicity is improved, but available bandwidth for transmission is reduced
Solution Approach 1:
The frequency hopping pattern dynamically adjusts the allocation of edge resources based on the center resource block position. When the center RB allows, edge resources are included to maximize bandwidth; when wrap-around would occur, edge resources are selectively excluded to maintain contiguity, thus balancing simplicity and available bandwidth
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for hopping design for larger bandwidth allocations in enhanced machine type communications (eMTC). A method of wireless communication by a user equipment (UE) is provided. The method generally includes receiving a resource allocation for uplink transmission in at least one subframe. The resource allocation includes a set of allocated subframes and configuration information for frequency hopping. The method includes determining allocated frequency hopped resources, within a system bandwidth, for each subframe of the set of allocated subframes. The method includes including a center resource block (RB) in addition to the determined allocated frequency hopped resources if the determined allocated frequency hopped resources include resources around the center RB. The method includes removing a last RB from the determined allocated frequency hopped resources if the determined allocated frequency hopped resources include resources around the center RB.