Inter-ENB Carrier Aggregation PDCP Reordering
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Solution Overview
Problem
Current LTE-Advanced communication systems are limited by the definition of intra-Evolved Node B (ENB) carrier aggregation, which restricts the aggregation of macro cells and pico cells, especially in scenarios where multiple pico cells overlap with a macro cell, reducing the applicability of carrier aggregation functions.
Innovation Solution
The implementation of inter-Evolved Node B (ENB) carrier aggregation and Packet Data Convergence Protocol (PDCP) operation switching/reordering methods in a multi-bearer environment, allowing for efficient data transmission and reception using multiple carriers, and enabling bearer reconfiguration between single and multi-bearers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If intra-ENB carrier aggregation is implemented, then data transmission efficiency is improved within a single ENB, but the aggregation of macro cells and pico cells from different ENBs is restricted
Solution Approach 1:
The patent segments the carrier aggregation function into two independent parts: intra-ENB carrier aggregation and inter-ENB carrier aggregation. This allows each type of aggregation to operate independently with its own control mechanisms, enabling macro cells and pico cells from different ENBs to be aggregated without interfering with existing intra-ENB operations
Solution Approach 2:
The patent creates a universal carrier aggregation framework that can handle both intra-ENB and inter-ENB scenarios. The system is designed to support multiple aggregation types through a common control plane, making the carrier aggregation function adaptable to various network configurations including overlapping macro and pico cell scenarios
2Area of stationary object
If multiple pico cells overlap with a macro cell, then network coverage and capacity are improved, but the applicability of carrier aggregation functions is reduced
Solution Approach 1:
The patent introduces a mediator mechanism in the form of a unified control plane that coordinates carrier aggregation across multiple ENBs. This mediator enables the system to manage complex overlapping scenarios by mediating between different ENBs and their respective cells, allowing macro and pico cells to coexist and aggregate effectively
Solution Approach 2:
The patent implements dynamic bearer reconfiguration that allows the system to adapt carrier aggregation configurations in real-time based on network conditions. This dynamic approach enables the system to optimize carrier aggregation settings for overlapping macro and pico cell scenarios, improving both coverage and carrier aggregation applicability
3Adaptability or versatility
If PDCP operation switching is implemented in multi-bearer environment, then data transmission flexibility is improved, but protocol operation complexity increases
Solution Approach 1:
The patent applies local quality by implementing PDCP operation switching at specific protocol layers and bearers where it is most needed. Rather than changing the entire PDCP protocol, the invention selectively applies different PDCP operations to specific bearers based on their requirements, reducing overall system complexity while maintaining flexibility
Solution Approach 2:
The patent implements partial PDCP operation switching, applying the switching mechanism only to the extent necessary for multi-bearer carrier aggregation. This partial approach provides sufficient flexibility for the intended application without implementing the full complexity of universal PDCP switching across all protocol operations
Data Source
AI summary
A bearer reconfiguration method performed by a User Equipment (UE) in a wireless communication system supporting a multi-bearer is provided. The bearer reconfiguration method includes, if the UE performs a bearer reconfiguration from a single bearer to the multi-bearer, reordering Packet Data Convergence Protocol (PDCP) Protocol Data Units (PDUs) received through the multi-bearer, using a timer after a completion of the bearer reconfiguration, and processing the reordered PDCP PDUs into at least one PDCP Service Data Unit (SDU). The method may also include, if the UE performs bearer reconfiguration from the multi-bearer to the single bearer, reordering PDCP PDUs received through the multi-bearer, using a timer until a predetermined condition is satisfied, and processing the reordered PDCP PDUs into at least one PDCP SDU.