SSB-Mapped Uplink Granting for Disconnected 5G Data Transmission
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Solution Overview
Problem
The configured grant (CG) scheduling transmission mechanism in 5G NR is limited to connected states and does not support data transmission in disconnected states due to the absence of channel state information (CSI) for downlink beamforming.
Innovation Solution
A method and device that associate Synchronization Signal and PBCH Block (SSB) with Configured Grant Occasion (CGO) to enable data transmission in disconnected states by using the beam corresponding to the SSB for uplink data sending and reception by the base station, even without CSI information, through predefined or calculated matching relationships.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the CG scheduling transmission mechanism is used for uplink data transmission, then the terminal can send data without sending Scheduling Request, but the mechanism is limited to connected states and does not support disconnected states due to absence of CSI
Solution Approach 1:
The base station pre-configures multiple CGO resources in advance with different SSB associations before the terminal enters disconnected state. When data needs to be transmitted, the terminal directly uses the pre-configured CGO resources without needing to establish connection or obtain CSI, thus enabling efficient small data transmission in disconnected state
Solution Approach 2:
The SSB serves as an intermediary to associate downlink beam information with uplink CGO resources. By linking CGO resources to specific SSBs, the system enables the terminal to determine appropriate uplink transmission resources based on downlink beam measurements, bridging the information gap without requiring full connection state
2Device complexity
If the terminal always uses resources specified by the first uplink grant for uplink transmission, then the transmission mechanism is simple, but the terminal cannot adapt to different downlink beam conditions in disconnected state
Solution Approach 1:
The uplink grant resources are segmented into multiple CGO occasions, each associated with a specific SSB. Instead of using a single unified uplink grant, the system divides resources into discrete time-frequency slots (CGOs) with different SSB associations, allowing the terminal to select the appropriate CGO based on measured SSB quality
Solution Approach 2:
Different CGO resources are assigned different local qualities or characteristics through their association with specific SSBs. Each CGO is optimized for particular beam conditions, allowing the terminal to select the locally optimal resource based on current downlink beam measurements rather than using a generic uplink grant
3Use of energy by moving object
If the terminal enters disconnected state to save power, then power consumption is reduced, but the terminal cannot transmit small data efficiently without frequent connection establishment
Solution Approach 1:
The terminal autonomously determines which CGO resource to use by measuring SSB signals and applying the pre-configured matching relationships, without needing network assistance or connection establishment. This self-service capability allows the terminal to remain in disconnected state while still efficiently transmitting small data
Data Source
AI summary
The present disclosure discloses a data transmission method and device. The method includes: determining, by a terminal in a disconnected state, a target CGO corresponding to a target SSB according to a matching relationship between the SSB and the CGO; sending, by the terminal, uplink data on the target CGO.