NR Resource Mapping via Sub-bandwidth Segmentation for Wi-Fi Coexistence
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Solution Overview
Problem
The Next Generation Radio (NR) system faces challenges in coexisting with Wi-Fi and License Assisted Access (LAA) networks due to its wider bandwidth, as existing resource mapping methods fail to effectively manage interference from Wi-Fi signals, leading to incomplete transmission and retransmission issues.
Innovation Solution
The NR system divides the carrier frequency band into sub-bandwidths and maps resource elements in an order of frequency and time domains within these sub-bandwidths, allowing for targeted retransmissions only in affected sub-bandwidths, thereby minimizing interference from Wi-Fi signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the NR system uses a single carrier band with wider bandwidth (80 MHz or more), then the data rate performance is improved, but the interference from Wi-Fi signals increases and coexistence becomes difficult
Solution Approach 1:
The patent divides the wide carrier bandwidth into multiple sub-bandwidths (e.g., four 20 MHz sub-bandwidths within an 80 MHz carrier). This segmentation allows the NR system to transmit data in frequency chunks that can be independently managed. When Wi-Fi interference is detected in certain sub-bandwidths, only those specific sub-bandwidths are affected, while other sub-bandwidths can continue transmitting without interruption, thus maintaining overall data rate performance while coexisting with Wi-Fi.
Solution Approach 2:
The patent applies different transmission strategies to different sub-bandwidths based on local interference conditions. Each sub-bandwidth can be independently activated or deactivated depending on whether Wi-Fi signals are detected in that specific frequency range. This local quality approach ensures that the NR system adapts to local interference conditions rather than being forced to reduce transmission across the entire carrier bandwidth.
2Productivity
If the NR system transmits data across the entire carrier bandwidth simultaneously, then the resource utilization is maximized, but the impact of Wi-Fi interference on transmission reliability increases
Solution Approach 1:
By segmenting the carrier into sub-bandwidths, the system can maintain high resource utilization in interference-free sub-bandwidths while ensuring transmission reliability in sub-bandwidths affected by Wi-Fi. The segmentation enables granular control over resource allocation, allowing the system to utilize available resources efficiently without compromising reliability in contaminated frequency regions.
Solution Approach 2:
The patent implements partial transmission by activating only the sub-bandwidths that are free from Wi-Fi interference. Instead of transmitting across the entire carrier bandwidth (excessive action that would cause interference issues), the system transmits only in the necessary, interference-free portions (partial action), thereby maintaining both resource utilization and transmission reliability.
3Device complexity
If the NR system uses existing resource mapping methods designed for 20 MHz bandwidth, then the implementation complexity is reduced, but the system cannot effectively manage interference in wider bandwidths
Solution Approach 1:
The patent extends existing 20 MHz resource mapping methods by applying them repeatedly to multiple 20 MHz sub-bandwidths within the wider carrier. This segmentation approach allows the system to reuse proven, low-complexity mapping algorithms rather than designing entirely new mapping methods for wideband transmission, thus maintaining implementation simplicity while gaining interference management capability.
Solution Approach 2:
The patent makes the resource mapping method universal by designing it to work across multiple sub-bandwidths simultaneously. The same mapping algorithm used for 20 MHz bands is applied to each sub-bandwidth, allowing a single method to serve multiple functions: maintaining low complexity while adapting to wider bandwidths and providing interference management through selective sub-bandwidth activation.
4Reliability
If the NR system performs Listen Before Talk (LBT) on the entire carrier bandwidth, then the coexistence with Wi-Fi is ensured, but the transmission latency increases due to checking all sub-bandwidths
Solution Approach 1:
The patent divides the LBT procedure into separate operations for each sub-bandwidth rather than performing a single LBT check across the entire carrier. This segmentation allows the system to identify which specific sub-bandwidths are available for transmission more quickly, reducing the effective latency compared to checking the whole bandwidth. The system can start transmission as soon as any sub-bandwidth becomes available.
Solution Approach 2:
The patent implements partial LBT by performing clearance checks only on the necessary sub-bandwidths rather than the entire carrier bandwidth. If only certain sub-bandwidths are needed for transmission or if only certain sub-bandwidths are free from Wi-Fi interference, the LBT process is performed only on those portions, significantly reducing the time required compared to checking the full bandwidth.
Data Source
AI summary
Embodiments of the present disclosure relate to methods, devices and apparatus of resource mapping for data transmission and of data receiving. In an embodiment of the present disclosure, a carrier frequency band for the data transmission is divided into a plurality of sub-bandwidths, and the method may include mapping resource elements for the data transmission in an order of sub-bandwidths and mapping, in each of the plurality sub-bandwidths, the resource elements first in an order of frequency domain and then in an order of time domain. With embodiments of the present disclosure, new radio access system with wider bandwidth could co-exist well with other communication on unlicensed band like WiFi.