Uplink Resource Allocation for Unlicensed Spectrum Coverage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In LTE systems, the existing resource allocation methods for uplink data transmission in unlicensed spectrum limit the transmit power of user equipment (UE), thereby affecting the service coverage of base stations due to constraints on power spectral density.
Innovation Solution
The method involves allocating uplink data in M basic resource elements within N basic resource elements, allowing for discrete resource block allocation to UE, which enhances the maximum transmit power by distributing resources efficiently across these elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If existing resource allocation methods (one RB or consecutive RBs) are used for uplink data transmission in unlicensed spectrum, then resource allocation simplicity is maintained, but transmit power of UE is limited due to power spectral density constraints
Solution Approach 1:
The patent divides the N basic resource elements into multiple groups, where M groups are selected for data transmission. This segmentation allows the UE to distribute its transmit power across multiple non-consecutive resource elements, thereby increasing the total allowed transmit power while complying with power spectral density limitations in unlicensed spectrum.
2Power
If consecutive RBs are allocated to UE, then resource allocation is simple and continuous, but power spectral density limitation restricts the total transmit power
Solution Approach 1:
The patent assigns different properties to different resource elements by selecting M groups out of N total groups. Each selected group can be configured with specific parameters (such as different cyclic shifts, different orthogonal cover codes, or different resource block allocations), allowing localized optimization of power distribution and resource utilization across the frequency spectrum.
3Reliability
If more resource blocks are allocated to increase transmit power, then service coverage is improved, but power spectral density constraint prevents further power increase
Solution Approach 1:
The patent transitions from allocating power across consecutive frequency resources (one-dimensional allocation) to selecting M groups out of N groups in a combinatorial manner (introducing combinatorial dimension). This allows the system to achieve higher total power transmission by utilizing the combinatorial space of group selections, thereby improving service coverage while adapting to power spectral density constraints.
Data Source
AI summary
Embodiments of the present invention provide a data sending method, a data receiving method, user equipment, and a base station. The method includes: receiving, by UE, an uplink scheduling grant, where the uplink scheduling grant includes first resource indication information; determining, by the UE, a target resource based on the first resource indication information, where the target resource is allocated resource blocks in M basic resource elements; and sending, by the UE, uplink data on the target resource. In the embodiments of the present invention, service coverage of a base station can be significantly improved.