Handover State Variable Management in Wireless Networks
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently handling handovers between base stations, particularly in configuring and processing Radio Resource Control (RRC) messages and Packet Data Convergence Protocol (PDCP) Service Data Units (SDUs) during handover preparation procedures.
Innovation Solution
A network architecture that includes a first and second base station, with processing circuits and storage devices, which transmit and receive RRC messages and PDCP SDUs, perform handover preparation, and update state variables like RX_NEXT, RX_DELIV, and RX_REORD to ensure seamless handover of communication devices between base stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the first base station performs handover preparation procedure with the second base station, then the handover reliability is improved, but the handover preparation time is increased
Solution Approach 1:
The first base station performs the handover preparation procedure with the second base station before the actual handover execution. This preliminary action includes configuring the second RRC message and preparing handover parameters in advance, so that when handover is triggered, the execution can proceed quickly with minimal interruption to data transmission.
2Manufacturing precision
If the first base station transmits multiple RRC messages and PDCP SDUs during handover, then the configuration completeness is improved, but the signaling overhead is increased
Solution Approach 1:
The first base station combines multiple configuration elements into the second RRC message, including DRB configurations, PDCP parameter configurations, and handover-related parameters. This merging reduces the number of separate signaling messages needed while ensuring all necessary configuration information is transmitted complete and accurately.
Solution Approach 2:
The second RRC message serves multiple functions simultaneously: it configures data radio bearers, configures PDCP parameters, provides handover command information, and establishes parameters for the target base station. This multi-functionality reduces signaling overhead by consolidating what would otherwise require multiple separate messages.
3Stability of the object's composition
If the base stations update state variables RX_NEXT, RX_DELIV, and RX_REORD during handover, then the data transmission continuity is improved, but the processing complexity is increased
Solution Approach 1:
The first base station determines the state variables RX_NEXT, RX_DELIV, and RX_REORD based on feedback information from the second base station regarding received PDCP SDUs. This feedback mechanism ensures that the handover parameters are accurately configured to maintain data transmission continuity, with the target base station's reception status informing the source base station's parameter selection.
Solution Approach 2:
The system dynamically adjusts the state variables RX_NEXT, RX_DELIV, and RX_REORD based on the handover progress and data reception status. These parameter changes ensure that the PDCP layer can seamlessly transition between source and target base stations without data loss or duplication, maintaining continuity while adapting to the specific handover scenario.
Data Source
AI summary
A network comprising a first BS and a second BS for handling a handover comprises at least one storage device storing instructions of: the first BS transmitting a first RRC message configuring a DRB on a SRB to a communication device and receiving a first RRC response message on the SRB; the first BS receiving a first plurality of PDCP SDUs; the first BS performing a handover preparation procedure with the second BS and transmitting a second RRC message on the SRB to the communication device; the second BS receiving a second RRC response message on the SRB; the first BS transmitting at least one of a RX_NEXT, a RX_DELIV and a RX_REORD; the second BS receiving a second plurality of PDCP SDUs and processing the second plurality of PDCP SDUs according to the at least one of the RX_NEXT, the RX_DELIV and the RX_REORD.