Carrier Activity Signal Resynchronization in LTE Networks
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Solution Overview
Problem
In LTE cellular networks, there is a synchronization issue between base stations and user equipment regarding the activation/deactivation of secondary cells, leading to erroneous transmissions, interference, and battery waste due to false activation/deactivation events.
Innovation Solution
A method where the base station sends an activity signal regarding the secondary cell's status and re-sends it during predefined subframes, ensuring synchronization and reducing the likelihood of false activation/deactivation by intelligent repetition of the command, avoiding unnecessary HARQ retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If MAC signaling is used to activate/deactivate SCell, then the activation/deactivation process is fast and efficient, but synchronization errors occur between base station and user equipment leading to false activation/deactivation events
Solution Approach 1:
The patent implements a feedback mechanism where the user equipment sends an acknowledgment signal back to the base station to confirm receipt and correct interpretation of the activation/deactivation command. This feedback loop ensures both parties have synchronized understanding of the SCell state, eliminating false activation/deactivation events while maintaining fast MAC signaling operation.
2Productivity
If the base station assumes SCell is active while it is deactivated at the user equipment, then transmission scheduling can proceed, but erroneous transmissions occur causing unnecessary interference
Solution Approach 1:
The patent applies preliminary action by requiring the base station to receive confirmation from the user equipment before assuming the SCell is properly activated. The acknowledgment signal serves as a preliminary verification step that ensures both parties are synchronized before any transmission scheduling occurs, preventing erroneous transmissions and interference.
3Reliability
If the user equipment monitors PDCCH on SCell when it should be deactivated, then no transmission errors occur, but battery power is wasted
Solution Approach 1:
The feedback mechanism ensures the user equipment has accurate knowledge of the SCell activation state by receiving confirmation from the base station. This reliable information allows the user equipment to correctly decide when to monitor PDCCH and when to enter sleep mode, maintaining transmission reliability while minimizing battery consumption through intelligent power management.
Data Source
AI summary
It is described a method for informing a user equipment of an activity status of a second communication carrier within a cellular network, wherein the user equipment is served by a base station and is adapted to communicate with the base station via a first communication carrier being assigned to the base station. Signals between the base station and the user equipment are transmittable using the first communication carrier and, if the second communication carrier is activated, using in addition the second communication carrier, wherein the first communication carrier is divided into subframes. The method includes sending an activity signal from the base station to the user equipment, wherein the activity signal includes information concerning the activity status of the second communication carrier, and re-sending the activity signal from the base station to the user equipment during predefined subframes.