Two-Tone PUSCH Allocation for efeMTC Spectral Efficiency
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Solution Overview
Problem
Current wireless communication technologies face challenges in enhancing the spectral efficiency of the physical uplink shared channel (PUSCH) for machine-type communications, particularly in supporting higher spectral efficiency and efficient resource allocation in narrowband Internet of things (NB-IoT) systems.
Innovation Solution
The implementation of a 2-tone allocation configuration for the physical uplink shared channel (PUSCH) with 2 out of 3 subcarriers, utilizing discrete Fourier transform (DFT)-spread and pi/2 binary shift keying (BPSK) modulation, along with advanced resource allocation techniques, demodulation reference signal (DMRS) design, and power control mechanisms to optimize spectral efficiency in even further enhanced machine-type communication (efeMTC) systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If single-tone allocation is used for PUSCH with subcarrier spacing of 3.75 kHz, then device complexity is reduced, but spectral efficiency is limited
Solution Approach 1:
The patent segments the frequency resource into multiple subcarriers (2 out of 3 subcarriers) within a physical resource block, allowing the system to transition from single-tone to multi-tone allocation. This segmentation enables higher spectral efficiency by utilizing multiple frequency resources simultaneously while maintaining manageable device complexity through standardized allocation patterns.
Solution Approach 2:
The patent introduces a new dimension of resource allocation by implementing 2-tone allocation configuration where two subcarriers are selected from three available subcarriers within a PRB. This dimensional expansion from single-tone to multi-tone allocation increases spectral efficiency without proportionally increasing device complexity, as the selection follows defined patterns rather than requiring exhaustive resource management.
2Productivity
If multi-tone allocation with 3, 6, or 12 subcarriers is used for PUSCH with subcarrier spacing of 15 kHz, then spectral efficiency is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by implementing 2-tone allocation within specific PRBs rather than uniformly across all resources. By selecting 2 out of 3 subcarriers locally within each PRB based on channel conditions and traffic requirements, the system achieves high spectral efficiency in critical areas while maintaining simpler allocation in other areas, thus balancing overall system performance with manageable complexity.
Solution Approach 2:
The patent introduces dynamic 2-tone allocation where the specific subcarrier selection can vary based on channel state information, interference conditions, and traffic demands. This dynamic approach allows the system to adaptively optimize spectral efficiency in real-time while using pre-defined allocation patterns to control device complexity, avoiding the need for complex real-time resource management algorithms.
3Productivity
If 2 out of 3 subcarriers are allocated for PUSCH in efeMTC, then spectral efficiency is enhanced, but resource allocation complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-configuring 2-tone allocation patterns and subcarrier selection rules before actual data transmission. The network pre-determines which 2 subcarriers out of 3 are allocated to each UE based on scheduling decisions, and this allocation information is signaled to the UE in advance. This preliminary configuration simplifies the actual transmission process and reduces real-time processing complexity while achieving high spectral efficiency.
Solution Approach 2:
The patent utilizes parameter changes by varying the subcarrier allocation parameters (selecting 2 out of 3 subcarriers) based on channel conditions and traffic requirements. By changing the allocation parameters dynamically while maintaining the structured 2-out-of-3 pattern, the system achieves high spectral efficiency without requiring complex resource management, as the basic allocation structure remains consistent even as specific subcarrier selections vary.
Data Source
AI summary
Embodiments of the present disclosure describe configuration and use of sub-physical resource block allocation for physical uplink shared channel and demodulation reference signals. Other embodiments may be described and claimed.