Uplink Carrier Selection Using SUL Thresholds in Idle State
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Solution Overview
Problem
In the context of fifth generation mobile communications, there is a lack of a mechanism for quickly transmitting uplink data packets in a supplementary uplink (SUL) carrier scenario, where the coverage of the uplink carrier is smaller than that of the downlink carrier.
Innovation Solution
A method is provided for a terminal device to determine, based on uplink data transmission thresholds and downlink signal quality, to transmit uplink data packets on either a first uplink carrier or an SUL carrier, utilizing a key related to a source base station to avoid signaling overheads and large transmission delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a terminal device transmits uplink data packets in the non-connected state on the first uplink carrier, then transmission speed is improved, but coverage is insufficient due to smaller uplink carrier coverage compared to downlink carrier coverage
Solution Approach 1:
The patent segments the uplink transmission by dividing it into two parts: small data packets (≤ threshold) transmitted on the first uplink carrier for speed, and large data packets (> threshold) transmitted on the SUL carrier for coverage. This segmentation resolves the contradiction by assigning different transmission paths to different data sizes based on their specific needs.
Solution Approach 2:
The patent implements dynamic carrier selection based on data packet size. The terminal device dynamically chooses between the first uplink carrier and SUL carrier according to whether the data packet size exceeds the threshold, allowing the system to adapt transmission parameters in real-time to balance speed and coverage requirements.
2Productivity
If the terminal device determines carrier selection based on data packet size threshold, then transmission efficiency is improved, but device complexity increases due to threshold comparison and carrier selection logic
Solution Approach 1:
The network device pre-configures the transmission threshold to the terminal device before data transmission. This preliminary action allows the terminal device to use simple threshold comparison logic during actual transmission, improving efficiency while keeping device complexity low since the complex threshold determination is performed in advance by the network.
3Loss of information
If the terminal device uses a key related to the source base station for encryption, then signaling overhead is reduced, but security management complexity increases
Solution Approach 1:
The patent makes the source base station's key serve multiple functions: it is used for encrypting both uplink data packets and uplink control information. This multi-functionality reduces signaling overhead by eliminating the need for separate encryption keys for different uplink transmissions, while the key management complexity remains manageable because the terminal device already possesses this key from previous RRC connection procedures.
Data Source
AI summary
This application provides a communications method and device, and a computer-readable storage medium. The method includes: receiving an uplink data transmission threshold from a first network device, where the uplink data transmission threshold includes both a first transmission threshold and a second transmission threshold or includes a second transmission threshold. The first transmission threshold is used to indicate a maximum size of a data packet supported by the terminal device in a non-connected state on a first uplink carrier, and the second transmission threshold is used to indicate a maximum size of a data packet supported by the terminal device in the non-connected state on a supplementary uplink (SUL) carrier. The method further comprises determining, based on the uplink data transmission threshold and a size of a to-be-transmitted uplink data packet, to transmit, in the non-connected state, the uplink data packet on the first uplink carrier or the SUL carrier.