Random Access Response Scheduling via DCI and SSB Identification
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Solution Overview
Problem
In wireless communication systems like LTE and 5G NR, random access conflicts occur due to limited preamble resources, leading to increased time overheads and delays as UEs attempt to access a base station, and the current cluster-based access method involves high delay due to response information being forwarded through a cluster head.
Innovation Solution
A data transmission method where a first terminal device sends SSB information and/or identity to a second terminal device, allowing direct receipt of response information from a network device based on DCI, reducing unnecessary receptions and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cluster-based random access is used to reduce access conflict probability, then access conflict probability is reduced, but access delay increases due to response information forwarding through cluster head
Solution Approach 1:
The patent uses the cluster head as an intermediary for transmitting response information from the base station to cluster members. The cluster head receives response information intended for cluster members and forwards it to them, enabling indirect communication that reduces access conflict while managing delay through efficient forwarding mechanisms
Solution Approach 2:
The patent segments the random access response information into cluster-specific portions, allowing the base station to send targeted responses to cluster heads who then distribute them to relevant cluster members. This segmentation enables parallel processing and reduces overall access delay while maintaining conflict reduction benefits
2Reliability
If terminal device receives all response information to ensure it gets its response, then response receipt reliability is improved, but power consumption increases due to repeated receptions of unnecessary information
Solution Approach 1:
The patent applies local quality by making response information reception selective rather than universal. Each terminal device receives only the response information specifically intended for it, identified through unique identifiers in the DCI format. This targeted approach maintains reliability for the intended recipient while avoiding unnecessary receptions by other devices, thereby reducing overall power consumption in the system
Data Source
AI summary
A data transmission method and a related device. In the method, a first terminal device receives response information based on received DCI that is associated with SSB information and/or a first identity and that is from a network device. In this way, the first terminal device may learn in advance, based on the received DCI, whether to receive response information scheduled by using the DCI. In other words, the first terminal device may identify, based on the DCI, whether a PDSCH scheduled by using the DCI is response information of the first terminal device, thereby avoiding repeated receiving of unnecessary response information, and reducing power consumption of the first terminal device.