Sub-band Scheduling for Low Latency Wireless Access
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Solution Overview
Problem
Conventional LTE random access processes are inadequate for supporting multiple transmission time intervals (TTIs) and cannot satisfy scheduling requirements for low latency and diverse service types, limiting efficient data transmission.
Innovation Solution
A sub-band scheduling method that allows user terminals to send data attribute requirements to the base station, which then allocates suitable target sub-bands for data transmission, enabling quick access and synchronization to match specific service requirements, including transmission delay, bandwidth, and packet loss sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional LTE random access processes are used, then basic access functionality is maintained, but the system cannot support multiple transmission time intervals and cannot satisfy low latency scheduling requirements
Solution Approach 1:
The patent segments the frequency spectrum into multiple sub-bands, where each sub-band can be independently scheduled for different service types and TTI configurations. This allows the system to divide the bandwidth into smaller units that can be dynamically allocated to meet diverse latency and transmission requirements, resolving the contradiction between maintaining basic access functionality and supporting multiple TTIs with low latency.
Solution Approach 2:
The patent introduces dynamic sub-band scheduling mechanisms that allow the base station to adaptively allocate and reconfigure sub-bands based on real-time service requirements and channel conditions. This dynamic allocation enables the system to switch between different TTI lengths and service types on different sub-bands, achieving both versatility across service types and low latency for time-sensitive traffic simultaneously.
2Adaptability or versatility
If a single frame structure is used, then system complexity is reduced, but the system cannot satisfy scheduling requirements for multiple TTIs and diverse services
Solution Approach 1:
The patent divides the system into multiple independent sub-band units, each capable of operating with different TTI configurations. This segmentation allows the system to support multiple TTIs without requiring a completely new complex frame structure, as each sub-band can be configured independently while maintaining overall system coherence through centralized scheduling control.
Solution Approach 2:
The patent designs a universal sub-band scheduling framework that can handle multiple service types and TTI configurations through a common resource allocation mechanism. This multi-functional approach allows a single frame structure to accommodate diverse requirements by dynamically configuring sub-bands, thereby supporting multiple TTIs without proportionally increasing overall system complexity.
3Productivity
If random access resources are concentrated on a common sub-band, then resource utilization is improved, but quick access to target sub-bands for specific services is delayed
Solution Approach 1:
The patent implements preliminary sub-band synchronization and pre-configuration mechanisms during the random access process. When a terminal gains access through the common sub-band, the system proactively prepares and allocates target sub-bands for specific services in advance, so that when data transmission is needed, the terminal can quickly switch to the pre-configured target sub-band without additional access delays, thus maintaining both high resource utilization and fast access speed.
Data Source
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AI summary
Embodiments of the present invention provide a sub-band scheduling method, including: sending, to a base station on a source sub-band, a first message that carries information about a data attribute requirement of to-be-transmitted data, where the information about the data attribute requirement includes at least one of the following: a transmission delay, a transmission delay type, a data bandwidth requirement, or a packet loss sensitivity; receiving, from the base station on the source sub-band, a second message that carries sub-band information of a target sub-band, where the target sub-band is a sub-band that is scheduled by the base station and that meets the data attribute requirement of the to-be-transmitted data, and the sub-band information includes at least one of the following: a sub-band number, a sub-band frequency channel number, a timing advance, an uplink resource allocated by the base station, a sub-band sending power level, or a bandwidth; and transmitting data on the target sub-band according to the sub-band information of the target sub-band. According to the sub-band scheduling method provided in the embodiments of the present invention, a target sub-band that is suitable for transmitting current data or a current service may be randomly accessed quickly, so as to implement a quick data or service transmission process on the target sub-band.