RRC Message Transmission on Unlicensed Spectrum
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Solution Overview
Problem
In wireless communication systems, the transmission of reference signals and RRC messages on unlicensed carrier resources faces challenges due to limited transmission opportunities caused by Listen Before Talk (LBT) operations and inter-node interference, particularly when these signals have different transmission periodicities and dependencies, affecting user experience and energy consumption.
Innovation Solution
A method and apparatus where a terminal device requests RRC messages based on default transmission parameters, and the network node transmits the RRC message at a predetermined time unit in response, reducing unnecessary transmissions and LBTs, thereby minimizing inter-node interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reference signals and RRC messages are transmitted periodically with different periodicities on unlicensed carrier, then system information can be delivered to terminal devices, but multiple LBT attempts are required and inter-node interference increases
Solution Approach 1:
The patent combines the transmission of reference signals and RRC messages into a single bundled transmission opportunity. By merging these previously separate transmissions, the system eliminates multiple LBT attempts and reduces inter-node interference while ensuring reliable delivery of system information to terminal devices.
2Reliability
If RRC messages are transmitted frequently to ensure reliable reception, then user experience improves, but energy consumption increases
Solution Approach 1:
The patent implements preliminary action by having the terminal device request RRC messages only when needed, rather than receiving them continuously. The network node transmits RRC messages in response to specific requests from terminal devices, which reduces unnecessary transmissions and lowers energy consumption while maintaining reliable message delivery.
3Adaptability or versatility
If reference signals and RRC messages are transmitted in different time instances, then transmission flexibility is maintained, but multiple LBT operations are required increasing complexity
Solution Approach 1:
The patent merges the transmission of reference signals and RRC messages into a single bundled transmission opportunity. This consolidation eliminates multiple sequential LBT operations while maintaining transmission flexibility through configurable parameters such as transmission periodicity and timing information that can be adjusted based on system conditions.
Data Source
AI summary
Embodiments of the present disclosure relate to a method and apparatus of data transmission in a wireless communication system and a method and apparatus of receiving data in a wireless communication system. The method of data reception comprises transmitting a request for the RRC message to the network node based on default transmission parameters; and receiving the RRC message from the network node at a predetermined time unit. With embodiments of the present disclosure, it is possible to request the RRC message when the terminal device need this message and therefore the RRC message transmission can be reduced and in turn, the inter-node interference can be limited, and the number of LBTs required for these signal transmissions can be reduced if they are transmitted on unlicensed spectrum.