Frequency Hopping for Reduced Bandwidth UEs in PUCCH
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Solution Overview
Problem
In cellular networks, particularly in 3GPP LTE systems, Machine Type Communications (MTC) UEs and non-stationary UEs face challenges with insufficient power for communication, especially in areas with poor coverage, leading to inadequate link budget, which is exacerbated by the high power consumption and resource inefficiency of repeated transmissions. Additionally, reducing transmission bandwidth for MTC UEs increases power consumption and decreases spectral efficiency.
Innovation Solution
Implementing frequency hopping mechanisms to reduce the number of repetitions required for reduced bandwidth UEs and UEs in enhanced coverage mode, utilizing inter-slot and inter-subframe frequency hopping, and configuring separate PUCCH regions for MTC UEs to maximize frequency diversity and minimize resource waste, while accommodating extended retuning times through shortened PUCCH formats.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If repeated transmissions are used to extend coverage, then link budget is improved, but power consumption increases and system resource utilization decreases
Solution Approach 1:
The patent applies frequency hopping dynamically across different slots and subframes, allowing the transmission frequency to change over time. This dynamic approach enables the system to achieve frequency diversity gain without requiring repeated transmissions at the same frequency, thereby improving link budget while reducing power consumption and avoiding resource waste from redundant transmissions.
Solution Approach 2:
The patent introduces frequency dimensionality by hopping between different frequency resources (PRBs) across slots and subframes. Instead of repeating transmissions in the time domain, the system exploits the frequency domain to provide diversity gain, effectively transforming the problem from temporal repetition to spatial frequency distribution.
2Reliability
If repeated transmissions are used to extend coverage, then link budget is improved, but system-level resource utilization decreases
Solution Approach 1:
Frequency hopping dynamically allocates frequency resources across different time slots and subframes, allowing efficient use of available spectrum. This prevents resource waste by ensuring that different UEs can be served on different frequencies simultaneously, improving system-level resource utilization while maintaining link budget through diversity gain.
Solution Approach 2:
The patent implements periodic frequency hopping patterns where frequencies are switched in a regular sequence across slots and subframes. This periodic action ensures fair and efficient resource distribution among multiple UEs, maximizing system resource utilization while providing consistent diversity gain for link budget.
3Use of energy by moving object
If transmission bandwidth is reduced for MTC UEs, then device cost and power consumption are reduced, but spectral efficiency decreases
Solution Approach 1:
The patent enables dynamic frequency hopping for MTC UEs with reduced bandwidth, allowing these UEs to access different frequency resources across slots and subframes. This dynamic access pattern compensates for the limited bandwidth by providing frequency diversity, thereby maintaining spectral efficiency while keeping device power consumption low.
Solution Approach 2:
The patent compensates for reduced bandwidth by exploiting the frequency dimension through hopping. MTC UEs with limited bandwidth can still achieve diverse frequency experiences by hopping across multiple PRBs, effectively using the frequency domain to compensate for temporal bandwidth limitations and maintain spectral efficiency.
4Reliability
If frequency hopping is implemented, then frequency diversity is improved, but device complexity increases
Solution Approach 1:
The patent segments the frequency hopping configuration into manageable components: slot-level hopping parameters and subframe-level hopping parameters. This segmentation allows complex frequency hopping behavior to be achieved through simple, modular configurations that can be independently controlled and adjusted, reducing the practical complexity of implementation.
Solution Approach 2:
The patent uses parameter-based configuration where frequency hopping is controlled through adjustable parameters such as hopping offset, hopping pattern, and timing indicators. This parameter-driven approach allows flexible frequency diversity to be achieved through simple parameter changes rather than complex hardware modifications, keeping device complexity manageable.
Data Source
AI summary
This application relates to enhanced coverage communication using a physical uplink control channel (PUCCH). PUCCH puncturing may be performed in relation to frequency hopping.