Dedicated Physical Channel for NB IoT Scheduling Requests
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Solution Overview
Problem
Current Narrowband Internet of Things (NB IoT) systems face inefficiencies in resource use and capacity limitations due to excessive low use efficiency in transmission scheduling requests and insufficient capacity of the narrowband physical random access channel (NPRACH), particularly in supporting a large number of user equipment (UEs) for both initial access and uplink data transmission.
Innovation Solution
A method and device for reporting scheduling requests in NB IoT systems, which involve acquiring dedicated physical resources comprising time, frequency, and sequence resources, allowing for contention-free random access and improved preamble sequence capacity, reducing inter-cell interference by configuring specific rules for subcarrier indices, repetition numbers, and cyclic prefixes, and using NPUSCH Format 2 for transmitting scheduling requests with high-order modulation or additional code words.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If NPRACH is used for scheduling request transmission, then initial access and scheduling requests share the same channel, but the capacity of NPRACH becomes insufficient and use efficiency of system resources becomes excessively low
Solution Approach 1:
The patent segments the scheduling request transmission function from the NPRACH by introducing a dedicated physical channel (NPUSCH Format 2) for scheduling requests. This separates the random access function (NPRACH) from the scheduling request function, allowing each to be optimized independently and resolving the capacity insufficiency of NPRACH while maintaining resource sharing capabilities.
Solution Approach 2:
The patent creates a multi-functional system where NPUSCH Format 2 can carry both scheduling requests and HARQ-ACK information, while NPRACH maintains its random access function. This universal design allows different channel types to serve multiple purposes without interfering with each other's capacity and efficiency.
2Ease of operation
If dedicated physical resources are allocated for scheduling requests, then resource competition is reduced, but system resource utilization efficiency becomes excessively low
Solution Approach 1:
The patent changes the resource allocation parameters by introducing configurable dedicated resources for scheduling requests with specific time-frequency structures. The system can adjust the periodicity, offset, and duration of these dedicated resources based on traffic conditions, thereby reducing resource competition while maintaining high utilization efficiency through dynamic parameter optimization.
Solution Approach 2:
The patent implements dynamic resource allocation where the dedicated physical resources for scheduling requests can be activated or deactivated based on system conditions. The eNB can configure and reconfigure these resources dynamically, allowing the system to adapt to varying traffic loads and maintain optimal resource utilization while providing dedicated access when needed.
Data Source
AI summary
A method and device for reporting scheduling request are provided. The method includes the operations of acquiring a dedicated physical resource of a random access channel (RACH) configured to report a scheduling request, when the scheduling request is triggered, transmitting the RACH on the dedicated physical resource. The dedicated physical resource includes a plurality of periodic physical resources. Through this dedicated physical resource, the user equipment (UE) can report scheduling request in a contention-free random access way, and the capacity of a preamble sequence is improved and inter-cell interference is reduced.