Flexible Bandwidth Voice Service Code Domain Scaling
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Solution Overview
Problem
Wireless communication systems face inefficiencies in utilizing allocated frequency spectrum due to non-integer multiples of channel bandwidths, leading to unutilized spectrum portions, especially in flexible bandwidth systems where voice services require specific data rates and quality of service without retransmission of lost data.
Innovation Solution
Implementing flexible bandwidth systems by scaling aspects within the code domain, such as adjusting spreading factors, using multi-code transmission, code rate increases, AMR codec rate adjustments, and higher order modulation, to compensate for bandwidth scaling and minimize latency in voice service transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If flexible bandwidth systems are implemented to utilize non-integer spectrum portions, then spectrum utilization efficiency is improved, but maintaining data rates and quality of service for voice services becomes difficult
Solution Approach 1:
The patent implements dynamic scaling of spreading factors based on the fractional bandwidth available. The system adjusts the spreading factor proportionally to the available bandwidth fraction, allowing the code domain parameters to adapt dynamically to the reduced bandwidth while maintaining the required data rates and quality of service for voice services.
Solution Approach 2:
The patent changes key parameters including spreading factor, code rate, and modulation order to compensate for the reduced bandwidth. By adjusting these parameters in the code domain, the system maintains the product of bandwidth and processing gain constant, thereby preserving data rates and quality of service despite operating in flexible non-integer bandwidth configurations.
2Productivity
If spreading factor is increased to maintain data rate in reduced bandwidth, then data rate is maintained, but latency increases
Solution Approach 1:
The patent applies partial scaling to the spreading factor based on the fractional bandwidth, rather than full scaling. By applying a scaled spreading factor that is proportional to but less than the inverse of the bandwidth fraction, the system maintains data rates while introducing only partial latency overhead, achieving a compromise between data rate maintenance and latency minimization.
3Productivity
If code domain adjustments are made to compensate for bandwidth scaling, then data rate and quality of service are maintained, but system complexity increases
Solution Approach 1:
The patent creates a universal scaling framework that can be applied across different bandwidth configurations and service types. The same scaling principles and parameter adjustments work for various fractional bandwidth scenarios and different service requirements, reducing the need for service-specific complexity while maintaining data rates and quality of service through standardized code domain adjustments.
Data Source
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AI summary
Methods, systems, and devices are disclosed for providing services, such as voice services, within flexible bandwidth systems. In general, the scaling of one or more aspects of a flexible bandwidth system may be compensated for through altering one or more aspects within a code domain. The tools and techniques may include scaling spreading factors (with rate matching tuning in some embodiments), multi-code transmission, code rate increases, AMR codec rate adjustments, and/or higher order modulation. Subframe decoding approaches for the reception scheme may also be utilized. These tools and techniques can be flexibly implemented on the mobile device and/or base station side. Some embodiments may also minimize the latency introduced by the transmission and/or reception process. Flexible bandwidths systems may utilize portions of spectrum that may be too big or too small to fit a normal bandwidth waveform.