Scheduling Request Transmission in Carrier Aggregated Networks
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Solution Overview
Problem
Conventional LTE-A systems face limitations in carrier aggregation between different eNBs, requiring a method for user equipment to efficiently request scheduling for uplink data transmission across multiple base stations, which is restricted by pre-fixed uplink component carriers and backhaul delays, leading to inefficiencies in dynamic scheduling.
Innovation Solution
A method and apparatus for user equipment to determine and transmit scheduling request information to a destination base station based on preset standards, utilizing resources specific to each carrier-aggregated base station, and managing transmission power to prioritize control information, allowing flexible scheduling across multiple eNBs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation is performed between different eNBs, then system bandwidth and data rate are improved, but scheduling request transmission becomes complex due to multiple base stations
Solution Approach 1:
The patent segments the scheduling request transmission by dividing it into two distinct parts: SR information transmission and uplink control information transmission. SR information is transmitted only when needed to request uplink resources, while uplink control information is transmitted periodically. This segmentation simplifies the overall transmission mechanism by separating event-driven requests from routine control signaling, making the system more manageable despite carrier aggregation complexity.
Solution Approach 2:
The patent introduces a destination base station selection mechanism that acts as an intermediary layer between the user equipment and multiple carrier-aggregated base stations. The UE determines which base station to send SR information to based on preset standards, and this selection process mediates the complexity of multi-base-station communication by providing a clear decision pathway.
2Ease of operation
If pre-fixed uplink component carriers are used, then resource allocation is simplified, but dynamic scheduling efficiency deteriorates
Solution Approach 1:
The patent implements dynamic base station selection for SR information transmission. Instead of fixing the uplink component carrier to a single base station, the UE dynamically determines the destination base station based on preset standards such as channel conditions, load status, or other criteria. This dynamic approach allows the system to adapt to changing network conditions while maintaining clear resource allocation rules.
3Reliability
If scheduling request information is transmitted to multiple base stations, then scheduling reliability is improved, but transmission power consumption increases
Solution Approach 1:
The destination base station selection mechanism serves as an intermediary that directs SR information to the most appropriate single base station rather than broadcasting to all base stations. This intermediary selection process maintains scheduling reliability by choosing the optimal recipient based on preset standards while significantly reducing power consumption compared to transmitting to multiple base stations simultaneously.
Data Source
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AI summary
The present invention relates to a method for a terminal requesting scheduling to transmit uplink data in a mobile communication system. More specifically, the present invention, in a system that aggregates carriers between different base stations, defines a process and a method for scheduling requests so that a terminal can transmit "scheduling request" control information to each base station, thereby enabling effective transmission of dynamic scheduling and uplink data.