PDCP Entity Configuration in Dual Connectivity via UE Capability Feedback
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Solution Overview
Problem
In radio communication systems, determining the appropriate PDCP entity for both split bearers and MCG bearers, particularly when configuring a signaling radio bearer as an MCG bearer, is challenging due to the inability of the eNB to recognize UE capabilities regarding NR-PDCP settings.
Innovation Solution
A radio communication system where the user device transmits a support indication to the radio base station about its capability to use a common PDCP entity for split and MCG bearers, allowing the base station to determine and notify the appropriate PDCP entity settings through RRC messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the eNB configures SRB 1 as an MCG bearer before acquiring UE Capability Information, then the PDCP entity can be set without notifying the UE, but the eNB cannot recognize whether the UE supports NR-PDCP setting
Solution Approach 1:
The patent applies preliminary action by having the UE transmit its capability information (including NR-PDCP support) before the eNB configures the SRB 1 as an MCG bearer. This allows the eNB to make informed decisions about PDCP entity selection (LTE-PDCP or NR-PDCP) before the bearer configuration is finalized, resolving the contradiction between ease of operation and information availability.
2Productivity
If the eNB determines PDCP entity settings without UE capability information, then the configuration process is simplified, but the appropriateness of PDCP entity selection cannot be ensured
Solution Approach 1:
The patent ensures that UE capability information is obtained in advance before bearer configuration begins. This preliminary acquisition of capability information allows the eNB to rapidly and accurately determine the appropriate PDCP entity (LTE-PDCP or NR-PDCP) without compromising either configuration speed or selection accuracy.
Solution Approach 2:
The patent implements feedback by having the UE provide capability information to the eNB, which then uses this feedback to make informed decisions about PDCP entity selection. The eNB configures the bearer based on this feedback loop, ensuring both efficient configuration and reliable entity selection.
3Loss of time
If the same PDCP entity is used for both split bearer and MCG bearer, then re-setting of PDCP entity is unnecessary, but the eNB cannot determine which PDCP entity to apply without capability information
Solution Approach 1:
The patent resolves this contradiction by having the UE transmit its capability information (including support for unified PDCP entity) before the eNB needs to make configuration decisions. This preliminary information availability allows the eNB to determine whether to use the same PDCP entity for both bearers without increasing decision-making complexity, thereby eliminating re-setting time.
Data Source
AI summary
A user device is disclosed including a receiver that receives from a first radio base station of a first system a setting information relating to a signaling radio bearer, and a processor that sets, in a dual connectivity between the first radio base station and a second radio base station of a second system, based on the setting information, a Packet Data Convergence Protocol (PDCP) entity of the signaling radio bearer to a PDCP entity of a second system.