User Equipment RLC Re-establishment for Split Bearer Deletion
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Solution Overview
Problem
In dual connectivity of LTE-Advanced systems, the deletion of a split bearer leads to redundant downlink packet transmission, reducing throughput due to unaddressed handover and reconnection operations, and improper handling of uplink transmission direction changes.
Innovation Solution
The user equipment performs re-establishment on the RLC and PDCP layers for the secondary base station during split bearer deletion and uplink transmission direction changes, ensuring that waiting packets are reordered and transmitted correctly, avoiding unnecessary retransmissions and discarding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If split bearer deletion is performed without re-establishment operations, then device complexity is reduced, but throughput is reduced due to redundant packet transmission
Solution Approach 1:
The patent applies preliminary action by performing re-establishment operations on the RLC and PDCP layers before completing split bearer deletion. This ensures that all packets are properly processed and transmitted before the bearer is fully deleted, preventing redundant transmissions and maintaining throughput while managing complexity through structured protocol operations
2Productivity
If re-establishment is performed on RLC and PDCP layers during split bearer deletion, then throughput is maintained, but processing time increases
Solution Approach 1:
The re-establishment operations are performed as a preliminary step before bearer deletion is complete, ensuring packets are ready for transmission without delaying the overall bearer deletion process. This maintains throughput while minimizing processing time impact
Solution Approach 2:
The patent maintains continuous useful action by ensuring packet reordering and transmission continues uninterrupted during the re-establishment process. The RLC layer reorders packets and the PDCP layer transmits them, maintaining data flow continuity while the bearer transition occurs
3Reliability
If split bearer deletion is performed without proper packet reordering, then processing time is reduced, but packet transmission reliability is reduced
Solution Approach 1:
The RLC layer performs continuous packet reordering during the bearer deletion process, ensuring all packets are properly sequenced before transmission. This maintains packet transmission reliability while the reordering operation continues without interruption throughout the transition period
4Reliability
If uplink transmission direction changes without re-establishment, then device complexity is reduced, but packet loss increases
Solution Approach 1:
The patent performs re-establishment operations on both RLC and PDCP layers before changing the uplink transmission direction. This preliminary action ensures all packets are properly processed and buffered, preventing packet loss when the transmission direction changes from one base station to another
Data Source
AI summary
A user equipment is disclosed that includes a transmission and reception unit configured to communicate with a master base station and a secondary base station simultaneously in dual connectivity. The user equipment includes a Radio Link Control (RLC) layer processing unit configured to have an RLC layer for the master base station and an RLC layer for the secondary base station and a Packet Data Convergence Protocol (PDCP) layer processing unit configured to have a PDCP layer transmitting and receiving data to/from the RLC layer for the master base station and the RLC layer for the secondary base station. When a split bearer configured for the secondary base station is deleted, the RLC layer processing unit performs re-establishment on the RLC layer for the secondary base station and releases the split bearer after execution of the re-establishment.