Uplink Resource Allocation in Unlicensed Bands
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Solution Overview
Problem
In wireless communication systems, the use of unlicensed frequency bands for LTE-eLAA faces challenges due to regulatory restrictions, leading to inefficient resource utilization as terminals often cannot occupy entire interlaces for PUSCH transmission, resulting in resource waste.
Innovation Solution
A method and apparatus that allow terminals to share uplink transmission resources with PUCCH and other signals, such as PUSCH, SRS, and PRACH, within unlicensed frequency bands, optimizing resource allocation to prevent waste by using remaining resources within interlaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resource allocation is based on the interlace structure to meet OCB requirements, then regulatory bandwidth requirements are satisfied, but resource utilization deteriorates when terminals cannot occupy entire interlaces
Solution Approach 1:
The interlace structure is segmented into multiple resource blocks that can be independently allocated. Instead of allocating entire interlaces, the system divides them into smaller units (resource blocks within interlaces) that can be flexibly assigned to different terminals based on their specific needs, ensuring both OCB compliance and efficient resource utilization
Solution Approach 2:
The patent applies partial action by allowing terminals to occupy only the portion of interlace resources they need rather than requiring full interlace occupation. This partial resource allocation enables terminals to use subsets of interlace resources while still meeting the 80% bandwidth occupancy requirement, thereby improving overall resource utilization
2Reliability
If entire interlaces are allocated for PUCCH transmission, then transmission reliability is improved, but resource waste occurs when PUSCH resources are also needed
Solution Approach 1:
The patent merges PUCCH and PUSCH resource allocation by allowing both signals to share the same interlace structure. Resource blocks within interlaces can be dynamically assigned to either PUCCH or PUSCH based on instantaneous needs, enabling both control and data transmissions to coexist efficiently without requiring separate dedicated resources
Solution Approach 2:
The interlace structure is designed with multi-functionality to serve both PUCCH and PUSCH purposes. The same physical resources (interlaces and resource blocks within them) can be flexibly configured for different functions depending on system requirements, eliminating the need for dedicated separate resources for each signal type
Data Source
AI summary
A signal transmission method and apparatus are described. A network device indicates an uplink transmission resource to a terminal by using first indication information, and the terminal transmits a PUCCH and a first signal on the uplink transmission resource indicated by the first indication information. The uplink transmission resource is within an unlicensed frequency band, and the first signal includes one or more of a PUSCH, an SRS, and a PRACH. Thus, if resources required for PUCCH transmission are fewer than resources included in one interlace in the unlicensed frequency band, a remaining resource in the interlace may be used to transmit the first signal.