Terminal Scheduling Request Encoding for 5G Latency Reduction
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Solution Overview
Problem
In LTE-A systems, the scheduling request from a terminal device to a network device for uplink data transmission resources is insufficient to determine the specific resource requirements, leading to high latency and inefficiency, which is exacerbated in 5G systems with stricter latency requirements.
Innovation Solution
The terminal device determines a specific time length for the scheduling request that includes information about the data transmission resource, allowing it to send the request on any symbol within a continuous time period using frequency or code domain resources, enabling the network device to allocate a resource applicable for data transmission, thereby reducing latency and signaling overheads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the scheduling request only notifies the network device that uplink data transmission resource is needed, then the signaling overhead is reduced, but the network device cannot determine the specific resource requirements, causing high latency and inefficiency
Solution Approach 1:
The patent combines multiple functions into the scheduling request signal: it both notifies the network device that uplink resources are needed and conveys information about the specific data transmission resource requirements (such as time length). This merging eliminates the need for separate signaling messages, thereby reducing latency while providing complete information about resource needs.
Solution Approach 2:
The scheduling request is designed to serve multiple purposes: it acts as both a notification signal and an information carrier about resource requirements. By making the scheduling request multi-functional, the system avoids additional signaling overhead and reduces the time needed for resource allocation, directly addressing the latency problem.
2Device complexity
If the network device allocates uplink resource without knowing specific requirements, then the resource allocation process is simplified, but the allocated resource may not be applicable to the terminal device, causing high latency
Solution Approach 1:
The terminal device performs preliminary action by including information about its data transmission resource requirements (such as desired time length) in the scheduling request before the network device makes the allocation decision. This allows the network device to make an informed allocation in a single step, avoiding iterative negotiations and reducing latency.
3Measurement precision
If the scheduling request includes information about data transmission resource, then the resource allocation accuracy is improved, but the signaling overhead increases
Solution Approach 1:
The patent merges the resource requirement information into the existing scheduling request structure rather than adding separate signaling messages. This approach provides precise resource allocation information while minimizing the increase in signaling overhead by reusing the already-established scheduling request channel.
Data Source
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AI summary
This application relates to the field of wireless communications, and in particular, to an information sending method and apparatus, and an information determining method and apparatus. This application provides an information sending method, including: determining, by a terminal device, a first time length corresponding to first information, where the first information is information about a data transmission resource; and sending, by the terminal device, a scheduling request on a first resource, where a time length of the first resource is equal to the first time length, and the scheduling request is used to request the data transmission resource. By using the information sending method provided by this application, instead of sending the first information actually, the terminal device sends the scheduling request according to the first time length corresponding to the first information, to report the first information, that is, information about the data transmission resource requested by the terminal device, to a network device.