Configured Grant Uplink Mapping for RRC-Inactive Reception
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In 5G communication systems, terminal devices in the RRC-inactive state need to transition to the RRC-connected state for data transmission, leading to inefficiencies and increased power consumption, and existing solutions for small data transmission do not adequately improve receiving performance at the access network device.
Innovation Solution
Configuring M CG resources to correspond to N downlink reference signals, allowing terminal devices to send uplink data without transitioning to the RRC-connected state, with flexible reconfiguration mechanisms to optimize data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If terminal devices in RRC-inactive state transition to RRC-connected state for data transmission, then data transmission can be performed, but power consumption and signaling overheads increase
Solution Approach 1:
The patent segments the data transmission process by introducing configured grant (CG) resources that allow terminal devices to transmit small data packets directly in RRC-inactive state without completing full RRC connection establishment. This segmentation separates small data transmission from the complete connection setup process, enabling efficient transmission for specific scenarios while avoiding unnecessary power consumption associated with full connection transitions.
2Use of energy by moving object
If terminal devices send uplink data on configured grant resources in RRC-inactive state, then power consumption is reduced, but access network device receiving performance deteriorates due to lack of channel information
Solution Approach 1:
The patent applies preliminary action by pre-configuring downlink reference signals and establishing their correspondence with configured grant resources before the terminal device transmits uplink data. The access network device uses these pre-configured reference signals to obtain channel information in advance, enabling it to perform receive beamforming and adjust reception parameters before actual data arrival, thus ensuring high receiving performance while the terminal remains in low-power RRC-inactive state.
Solution Approach 2:
The patent implements feedback mechanisms where the terminal device measures downlink reference signals and reports measurement results to the access network device. The access network device uses this feedback to adjust and optimize the correspondence between CG resources and downlink reference signals, ensuring that the pre-configured reference signals accurately reflect current channel conditions for reliable reception.
3Reliability
If downlink reference signals are pre-configured for CG resources, then receiving performance is improved, but device complexity increases due to resource configuration and management
Solution Approach 1:
The patent applies universality by designing a standardized configuration framework where downlink reference signals serve multiple functions: they are used for channel estimation, receive beamforming, and as basis for CG resource allocation. This multi-functional design reduces the need for separate specialized mechanisms, thereby managing complexity while achieving improved receiving performance through unified reference signal utilization across different operations.
Data Source
AI summary
This application discloses a communication method and apparatus. In the method, a terminal device receives first configuration information from an access network device, where the first configuration information is for configuring M configured grant (CG) resources to correspond N downlink reference signals. The M CG resources are used by the terminal device to send uplink information when the terminal device is in a non-connected state. The terminal device then receives first reconfiguration information from the access network device after the terminal device enters the non-connected state, where the first reconfiguration information is for updating downlink reference signals corresponding to some or all of the M CG resources.