Uplink Message Frequency Hopping Across Sub-Bands for Limited-Bandwidth UE
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Solution Overview
Problem
Uplink message transmissions in bandwidth-limited user equipment (UE) do not achieve sufficient frequency diversity gain due to limited bandwidth, as existing inter-slot frequency hopping is constrained within a sub-band, which restricts frequency diversity.
Innovation Solution
Implement inter-slot frequency hopping across multiple sub-bands of the initial uplink bandwidth part, allowing a single sub-band to be used in each slot for uplink message repetitions, enhancing frequency diversity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inter-slot frequency hopping is configured within a sub-band for bandwidth-limited UE, then the UE can perform frequency hopping, but frequency diversity gain is insufficient due to limited bandwidth
Solution Approach 1:
The patent extends frequency hopping from a one-dimensional approach (within a single sub-band) to a two-dimensional approach by introducing inter-sub-band frequency hopping. The UE hops between different sub-bands across multiple slots, effectively utilizing the time dimension to achieve broader frequency diversity. This allows the UE to access a larger frequency range despite bandwidth limitations in any single slot.
Solution Approach 2:
The patent segments the available bandwidth into multiple sub-bands and assigns different sub-bands to different slots for frequency hopping. By dividing the frequency spectrum into segments (sub-bands) and using time division to switch between them, the system achieves frequency diversity without requiring the UE to handle the entire bandwidth simultaneously, thus resolving the contradiction between diversity gain and device complexity.
2Ease of operation
If frequency hopping is restricted to a sub-band, then the UE operation is simplified, but frequency diversity is limited
Solution Approach 1:
The patent introduces dynamic frequency hopping by allowing the UE to switch between different sub-bands based on the slot number. The frequency hopping pattern is dynamically adjusted across slots rather than being static within a single sub-band. This dynamic approach maintains operational simplicity for the UE while significantly improving frequency diversity through automated sub-band switching.
3Use of energy by moving object
If the UE uses limited bandwidth for uplink transmission, then power consumption is reduced, but frequency diversity gain is insufficient
Solution Approach 1:
The patent ensures continuous frequency diversity utilization by maintaining frequency hopping across multiple slots. Instead of having the UE stay on a fixed frequency, the system continuously hops between sub-bands in each slot, ensuring that frequency diversity is maintained throughout the entire transmission sequence. This continuous action allows the UE to achieve diverse frequency experience without requiring higher instantaneous bandwidth, thus managing power consumption effectively.
Data Source
AI summary
An apparatus for wireless communication receives information enabling one or more repetitions of an uplink message associated with a network access procedure, wherein a maximum bandwidth allocated to the apparatus is less than a bandwidth of an initial uplink bandwidth part of the apparatus, receives a frequency hopping indication for the one or more repetitions of the uplink message, and transmits the uplink message and the one or more repetitions of the uplink message in different slots using inter-slot frequency hopping based on at least the information and the frequency hopping indication, wherein the inter-slot frequency hopping includes multiple sub-bands of the initial uplink bandwidth part, and wherein a single sub-band of the multiple sub-bands is used in each of the different slots.