Uplink Control Information Resource Allocation for Frequency Hopping
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Solution Overview
Problem
In wireless communication systems, especially in 5G and NR systems, frequency hopping for PUSCH leads to uneven distribution of resources for UCI (Uplink Control Information) across frequency hops, resulting in unused resources and suboptimal spectrum efficiency due to odd numbers of symbols, which is not desirable for HARQ-ACK and CSI reports.
Innovation Solution
The proposed solution involves determining the number of modulated symbols for HARQ-ACK and CSI parts in each frequency hop based on the total number of OFDM symbols, ensuring a balanced distribution across hops to maximize resource utilization, using equations such as GACK(1)=NL·Qm·└GACK/(2·NL·Qm)┘ and GCSI-part1(1)=NL·Qm·└GCSI-part1/(2·NL·Qm)┘ to allocate resources efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequency hopping is applied to PUSCH, then diversity gain and reliability are improved, but resource distribution becomes uneven across frequency hops
Solution Approach 1:
The patent segments the UCI resources (HARQ-ACK and CSI parts) into two separate parts that can be independently allocated to different frequency hops. This segmentation allows each hop to receive an appropriate portion of resources, resolving the uneven distribution problem while maintaining the reliability benefits of frequency hopping.
Solution Approach 2:
The patent applies local quality by allowing different frequency hops to have different resource allocations based on their specific conditions. Each hop can be optimized with appropriate UCI resources according to local channel conditions, rather than applying a uniform distribution scheme across all hops.
2Reliability
If frequency hopping is applied to PUSCH, then diversity gain is improved, but spectrum efficiency deteriorates due to unused resources
Solution Approach 1:
The patent introduces dynamic resource allocation where the number of UCI resources in each frequency hop is determined based on the total number of OFDM symbols and the specific hop index. This dynamic approach ensures that resources are efficiently utilized across hops without leaving unused resources, thereby improving spectrum efficiency while maintaining diversity gain.
Solution Approach 2:
The patent changes the parameter of resource allocation by using mathematical formulations that distribute UCI resources based on the total symbol count and hop characteristics. This parameter-based allocation ensures optimal utilization of resources across frequency hops, eliminating waste and improving spectrum efficiency.
3Productivity
If total UCI resources are distributed across frequency hops, then resource utilization improves, but uneven distribution occurs when symbol count is odd
Solution Approach 1:
The patent applies asymmetry by allowing the first and second frequency hops to have different resource allocations when the total symbol count is odd. Instead of forcing equal distribution, the system accepts asymmetric allocation where one hop may have one additional resource element, thereby achieving complete resource utilization without waste.
Data Source
AI summary
Described is an apparatus of a User Equipment (UE) operable to communicate with an Evolved Node-B (eNB) on a wireless network. The apparatus may comprise a first circuitry and a second circuitry. The first circuitry may be operable to allocate a first set of Resource Elements (REs) for a set of Uplink Control Information (UCI) types corresponding with a first set of frequency resources. The first circuitry may also be operable to allocate a second set of REs for the set of UCI types corresponding with a second set of frequency resources. The second circuitry may be operable to prepare one or more Physical Uplink Shared Channel (PUSCH) transmissions comprising the first set of REs and the second set of REs. A number of REs in the first set of REs may be different than a number of REs in the second set of REs.