DCI Search Space Segmentation for Random Access Response Differentiation
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Solution Overview
Problem
In future network deployments, such as 5G, terminal devices of different types (R15 and R16 UEs) may coexist in a cell, leading to confusion in receiving random access response messages, resulting in data parsing errors due to the lack of differentiation in random access types.
Innovation Solution
A method where a network device transmits DCI (Downlink Control Information) based on the current random access type to schedule corresponding random access response messages, ensuring consistent understanding between the network device and terminal devices, by using indication information and specific search spaces for different types of random access procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple types of random access procedures are supported in the same cell, then the network can accommodate different terminal device types (R15 and R16 UEs), but terminal devices cannot differentiate between random access response messages corresponding to different random access types, leading to data parsing errors
Solution Approach 1:
The patent segments the random access response message transmission by creating separate search spaces for different random access types. Specifically, a first search space is configured for carrying DCI related to 4-step random access, and a second search space is configured for carrying DCI related to 2-step random access. This segmentation allows terminal devices to differentiate between response messages by detecting DCI in the appropriate search space, thereby resolving the contradiction between supporting multiple access procedures and ensuring message differentiation accuracy
Solution Approach 2:
The patent introduces DCI (Downlink Control Information) as an intermediary element that carries indication information about the random access type. The DCI includes a random access type indication field that explicitly identifies whether the response message corresponds to 4-step or 2-step random access. This intermediary mechanism enables terminal devices to correctly interpret response messages without confusion, maintaining reliability while supporting multiple access procedures
2Device complexity
If a unified search space is used for all random access response messages, then the system structure is simplified, but terminal devices experience data parsing errors due to inability to differentiate message types
Solution Approach 1:
Instead of using a unified search space, the patent divides the search space into multiple distinct sections: a first search space for 4-step random access DCI and a second search space for 2-step random access DCI. This segmentation prevents information loss by ensuring that terminal devices can identify the correct message type through search space location, while keeping the overall structure manageable through systematic organization
Solution Approach 2:
The patent uses different search space configurations as distinguishing characteristics (analogous to color changes) for different random access types. Each search space has specific configuration parameters that differentiate it, allowing terminal devices to identify the random access type based on which search space the DCI is detected in, thereby preserving critical type information without excessive complexity
Data Source
AI summary
An information transmission method, an information detection method, a terminal device, and a network device are provided. The information transmission method includes: transmitting DCI to a terminal device based on a current random access type, where the DCI is used to schedule a random access response message corresponding to the current random access type.