Random Access Data Transmission with MAC PDU Type Indication
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing wireless communications systems face challenges in reducing transmission delays during random access procedures, particularly in low-delay services, due to limitations in resource allocation and transport block sizes.
Innovation Solution
The introduction of a type indication field in the MAC PDU to indicate flexible resource allocation, allowing for larger transport block sizes or smaller allocation granularities, thereby optimizing the data transmission process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the existing random access procedure is used with fixed transport block sizes and resource allocation granularity, then the system maintains simplicity in resource management, but the data transmission delay increases and resource allocation flexibility is reduced
Solution Approach 1:
The patent introduces dynamic resource allocation by enabling the transport block size and resource allocation granularity to be adjusted based on service requirements. The random access response can indicate different transport block sizes (e.g., first size for initial access, second size for subsequent transmissions) and different resource granularities (e.g., first granularity for normal cases, second granularity for low-delay services), making the system adaptive rather than static.
Solution Approach 2:
The patent changes key parameters including transport block size, resource allocation granularity, and the introduction of a type indication field in the random access response. These parameter changes allow the system to optimize data transmission by selecting appropriate parameter combinations based on service type and channel conditions, directly addressing the delay reduction goal.
2Productivity
If larger transport block sizes are used to increase data transmission efficiency, then the productivity improves, but the resource allocation flexibility deteriorates due to fixed allocation granularity
Solution Approach 1:
The patent segments the resource allocation into different granularity levels. By introducing multiple resource allocation granularities (first granularity and second granularity), the system can divide resources appropriately based on needs - coarser granularity for large transport blocks to maintain efficiency, and finer granularity when flexibility is required, thus resolving the contradiction between productivity and adaptability.
Solution Approach 2:
The system dynamically selects between different resource allocation granularities based on the service type and transmission requirements. The random access response includes indicators that enable the terminal to determine whether to use first or second granularity, allowing the system to maintain high productivity when using large transport blocks while preserving flexibility when needed.
3Adaptability or versatility
If the random access procedure uses fixed resource allocation, then the system complexity remains low, but the ability to handle low-delay services with varying requirements is reduced
Solution Approach 1:
The patent enhances the universality of the random access procedure by making it capable of handling multiple service types (normal services and low-delay services) through a unified mechanism. The type indication field in the random access response serves multiple functions: indicating transport block size, resource allocation granularity, and service type, thereby reducing the need for separate procedures for different services while improving adaptability.
Solution Approach 2:
The patent introduces a type indication field as an intermediary element in the random access response. This intermediary carries multiple pieces of information (transport block size indicator, resource allocation granularity indicator) that mediate between the base station's scheduling decisions and the terminal's transmission parameters, enabling flexible service handling without significantly increasing overall system complexity.
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
An embodiment of this application provides a data transmission method and apparatus. The method includes: receiving, by a base station, a random access preamble sequence sent by a terminal; and sending, by the base station, a media access control MAC packet data unit PDU to the terminal based on the random access preamble sequence, where the MAC PDU includes a type indication field, and the type indication field is used to indicate a manner in which the terminal transmits data in first uplink information. In this embodiment of this application, a data transmission delay can be reduced.