NR Sidelink Control Data Multiplexing in PSSCH
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting control data, particularly in scenarios where user equipment (UE) is out of coverage or not connected to a base station, leading to suboptimal resource allocation and interference management in sidelink communications.
Innovation Solution
The proposed solution involves using a novel control message format, where a first control message is transmitted in the control region and one or more second control messages are included in the data region of the Physical Sidelink Shared Channel (PSSCH), allowing for improved transmission of additional control information such as assistance information messages (AIMs) that occupy resources typically allocated for payload data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control data is transmitted only in the control region using traditional control messages, then the control region structure is maintained, but the reliability and latency of sidelink communications deteriorate in out-of-coverage scenarios
Solution Approach 1:
The control information is segmented into two stages: first-stage SCI in the control region and second-stage SCI in the data region. This segmentation allows detailed control data to be distributed across different regions, improving reliability without overwhelming the control region structure.
Solution Approach 2:
The patent extends control information transmission from the traditional one-dimensional control region into the data region dimension. By placing second-stage SCI in the data region, the system utilizes an additional spatial dimension for control data transmission, enhancing reliability in out-of-coverage scenarios.
2Loss of information
If additional control information is transmitted in the data region, then resource allocation and interference management information is improved, but the data region resource allocation becomes more complex
Solution Approach 1:
The first-stage SCI in the control region performs preliminary action by providing resource allocation information and indicators that prepare the UE for receiving and interpreting the second-stage SCI in the data region. This preliminary signaling simplifies the overall processing complexity.
Solution Approach 2:
The first-stage SCI acts as an intermediary that bridges the control region and data region. It provides necessary context and indicators that enable the UE to correctly interpret the second-stage SCI, reducing the complexity of direct data region interpretation.
3Loss of information
If second control messages occupy resources allocated for payload data, then control information transmission capacity is improved, but the payload data transmission capacity decreases
Solution Approach 1:
The system dynamically allocates data region resources between second-stage SCI and payload data based on communication needs. When control information requires enhanced transmission, the second-stage SCI occupies data region resources; otherwise, resources are available for payload data, creating a flexible and dynamic resource allocation scheme.
Solution Approach 2:
The patent changes the parameter of resource allocation by allowing data region resources to serve dual purposes: payload data transmission and control information transmission. This parameter change enables the system to adapt resource usage based on whether second-stage SCI is present, balancing control information capacity and payload capacity.
Data Source
AI summary
A user device, UE, for a wireless communication network is described that communicates with one or more network entities of the wireless communication network, like a base station or another UE. The UE receives from a network entity a transmission, the transmission including a control region, like a Physical Sidelink Control Channel, PSCCH, and a data region, like a Physical Sidelink Shared Channel, PSSCH. The transmission includes a first control message, like a 1st-stage SCI, in the control region, and a second control message, like a 2nd-stage SCI, in the data region. The second control message includes control data and occupies some or all of the resources allocated in the data region of the transmission, or is associated with control data included in at least a part of the data region of the transmission.