Sidelink DRX Grant Timing for Receiver Active-Time Alignment
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Solution Overview
Problem
The DRX mechanism in sidelink communication fails to function effectively due to the time domain position of allocated sidelink resources not aligning with the DRX active time of the receiving terminal device, leading to wasted resources.
Innovation Solution
A terminal device communicates sidelink DRX parameters or indication information to the network device to determine a time period that aligns with the DRX active time of the receiving terminal device, ensuring the network allocates resources within this period for PSCCH and PSSCH transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network device allocates sidelink resources without considering DRX active time alignment, then resource allocation is simple and fast, but the DRX mechanism cannot work effectively and resources are wasted
Solution Approach 1:
The transmitting terminal device performs preliminary action by sending DRX parameter information to the network device before resource allocation. The network device uses this advance information to determine a time period that aligns with the receiving terminal's DRX active time, ensuring resources are allocated at the appropriate time without requiring complex real-time coordination during the actual resource allocation process.
Solution Approach 2:
The system implements feedback by having the transmitting terminal device send DRX parameter information to the network device. The network device then uses this feedback information to adjust the resource allocation timing, ensuring the allocated resources fall within the receiving terminal's DRX active time period, thereby resolving the alignment issue.
2Productivity
If the network device allocates sidelink resources without DRX active time information, then the allocation process is simple, but the receiving terminal cannot receive resources during DRX non-active time causing resource waste
Solution Approach 1:
The transmitting terminal device performs preliminary action by sending DRX parameter information to the network device before resource allocation. The network device uses this advance information to determine a time period that aligns with the receiving terminal's DRX active time, ensuring resources are allocated at the appropriate time without requiring complex real-time coordination during the actual resource allocation process.
Solution Approach 2:
The system changes the parameter of resource allocation timing based on DRX active time information. The network device adjusts the time domain position of allocated resources to match the receiving terminal's DRX active period, transforming the resource allocation from a fixed timing approach to a dynamic timing approach that adapts to DRX state.
Data Source
AI summary
A method includes that a first terminal device sends a sidelink discontinuous reception (DRX) parameter of a second terminal device or indication information to a network device such that the network device determines a first time period based on the sidelink DRX parameter or the indication information, where the first time period belongs to sidelink DRX active time of the second terminal device. The first terminal device receives a sidelink grant sent by the network device, where the sidelink grant is used to indicate the first terminal device to send a resource of a physical sidelink control channel (PSCCH) and/or a physical sidelink shared channel (PSSCH), and a time domain position of the resource is in the first time period. The first terminal device sends a PSCCH and/or a PSSCH based on the sidelink grant.