Uplink Data Transmission with Preallocated Transport Block Sizes
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Solution Overview
Problem
Conventional request-grant-based uplink data transmission methods in cellular networks are inadequate for future wireless cellular networks due to increased terminal quantities and higher delay and signaling overhead requirements, while non-grant-mode transmission methods suffer from long processing delays and blind detection costs in non-orthogonal multiple access technologies.
Innovation Solution
A method where a network device allocates transmission areas and transport block sizes to terminal devices, allowing them to transmit uplink data without a grant, using non-orthogonal multiple access technologies like SCMA, and provides indication messages for data transmission, reducing processing delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional request-grant-based uplink data transmission method is used, then the transmission process is controlled and reliable, but the network delay increases and signaling overhead increases
Solution Approach 1:
The base station pre-allocates multiple transmission areas and corresponding transport block sizes to the terminal device before uplink data transmission. This preliminary allocation eliminates the need for real-time grant requests and responses, thereby reducing network delay while maintaining controlled transmission through predefined parameters.
2Loss of information
If a non-grant-mode transmission method with blind detection is used, then signaling overhead is reduced, but processing delay increases due to trying all possible transport block sizes
Solution Approach 1:
The base station performs preliminary allocation of specific transport block sizes corresponding to each transmission area before the terminal device transmits uplink data. This eliminates the need for blind detection of all possible transport block sizes, significantly reducing processing delay at the base station while maintaining low signaling overhead through the compact indication message.
3Productivity
If non-orthogonal multiple access technology is used, then network capacity and spectral efficiency are improved, but decoding complexity increases due to multiple data streams on same resource
Solution Approach 1:
The base station pre-configures and indicates specific codebook-pilot sets corresponding to each transmission area to the terminal device before uplink data transmission. This preliminary configuration enables the terminal to use the indicated codebook and pilot sequence for data transmission, allowing the base station to decode with reduced complexity by knowing the specific codebook-pilot combination in advance, thus maintaining high network capacity while reducing decoding complexity.
Data Source
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AI summary
The present invention discloses an uplink data transmission method and apparatus. The method includes: determining M transmission areas allocated to a terminal device, and generating first information used to indicate the M transmission areas, where M is a positive integer, and the transmission area represents an air interface time-frequency resource that includes a time range and a frequency range that are specified by a communications system; determining, for each transmission area of the M transmission areas, second information used to indicate a transport block size; and sending an indication message to the terminal device, so that the terminal device transmits uplink data according to the indication message, where the indication message includes the first information and the second information. By means of the uplink data transmission method and apparatus provided in embodiments of the present invention, a network device can decode uplink data on a transmission area according to a transport block size, so that a processing delay can be reduced.