Conditional Primary Secondary Cell Change Transaction ID Handling
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Solution Overview
Problem
In wireless communication systems, particularly in dual connectivity scenarios, there is a challenge in handling transaction IDs during conditional primary secondary cell changes (CPC), which can lead to unnecessary secondary node connection failures and misinterpretation of RRC messages.
Innovation Solution
A method and apparatus for wireless devices and nodes to manage transaction IDs by receiving a CPC command with a set RRC transaction ID, executing CPC based on conditions, and transmitting RRC messages without a transaction ID, ensuring proper handling and prevention of connection failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transaction ID is set in the RRC reconfiguration message during CPC procedure, then the message can be properly identified and tracked, but it may cause unnecessary secondary node connection failures and misinterpretation of RRC messages
Solution Approach 1:
The patent extracts the transaction ID from the RRC reconfiguration message sent to the secondary node, keeping it only in the message between master node and wireless device. This removes the harmful element (transaction ID) that causes secondary node connection failures while preserving the necessary message identification capability in the appropriate communication path.
Solution Approach 2:
The master node acts as an intermediary that generates and manages the transaction ID locally without forwarding it to the secondary node. The master node mediates between the wireless device and secondary node, ensuring the transaction ID serves its identification purpose without causing harm to the secondary node connection.
2Ease of operation
If a transaction ID is included in all RRC messages during CPC, then message tracking is simplified, but it increases message complexity and potential for errors
Solution Approach 1:
The transaction ID is applied locally only where needed - in the RRC reconfiguration message between master node and wireless device - but not universally in all RRC messages. This localized application maintains message tracking capability where required while avoiding unnecessary complexity in other message types.
Solution Approach 2:
The message structure is segmented to include transaction ID only in specific message types and communication paths. The RRC reconfiguration message is divided into parts, with the transaction ID included only in the portion exchanged between master node and wireless device, not in messages involving the secondary node.
Data Source
AI summary
The present disclosure relates to transmitting a response message in wireless communications. According to an embodiment of the present disclosure, a method performed by a wireless device served by a master node (MN) and a secondary node (SN) in a dual connectivity (DC) in a wireless communication system comprises: receiving, from the MN via a signalling radio bearer 1 (SRB1), a conditional primary secondary cell change (CPC) command related to a radio resource control (RRC) reconfiguration message of which a RRC transaction identifier (ID) is set; performing a CPC execution based on that a CPC condition in the CPC command is satisfied; and transmitting, to the MN, an RRC message of which no RRC transaction ID is set based on the CPC execution, wherein the RRC message comprises a RRC reconfiguration complete message of which the RRC transaction ID is set.