C-RNTI Collision Avoidance in Inter-Base Station Cell Aggregation
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Solution Overview
Problem
Current communication systems face challenges in inter-base station cell aggregation, particularly in managing cell temporary identifiers (C-RNTIs) to prevent collisions and ensure seamless communication between user equipment and base stations across different cells.
Innovation Solution
A method where a first base station requests a second base station to add its cell as a serving cell for user equipment, and if a C-RNTI collision is detected, the identifiers are adjusted or a preamble is allocated to initiate random access, allowing the user equipment to communicate using a unique identifier, thereby avoiding collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If inter-base station cell aggregation is introduced to enable UE to communicate with multiple base stations simultaneously, then service quality and transmission rate are improved, but C-RNTI collision risk increases
Solution Approach 1:
The patent applies preliminary action by having the first base station query the second base station for available C-RNTIs before actually establishing the inter-base station cell aggregation connection. This advance check prevents identifier collision before it can occur, allowing the system to prepare and verify identifier availability in advance rather than reacting after a collision is detected.
Solution Approach 2:
The patent implements feedback through the message exchange mechanism where the first base station sends a request containing the first UE's identifier to the second base station, receives a response indicating whether the identifier is available or collides with another UE's identifier, and then proceeds accordingly. This feedback loop ensures that identifier conflicts are detected and resolved before aggregation is established.
2Reliability
If a C-RNTI allocation mechanism is introduced for inter-base station cell aggregation, then communication reliability is improved, but system complexity increases
Solution Approach 1:
The patent applies universality by designing a C-RNTI allocation mechanism that serves multiple functions: it allocates identifiers for intra-base station cell aggregation, handles inter-base station cell aggregation scenarios, and prevents identifier collisions across different aggregation types. This multi-functional approach eliminates the need for separate allocation mechanisms for different scenarios, reducing overall system complexity despite the added capability for inter-base station aggregation.
Data Source
AI summary
Embodiments of the present invention provide a communication method, which includes: requesting, by a first base station, a second base station to add a cell of the second base station as a serving cell of first user equipment; when finding that a first identifier of the first user equipment is the same as an identifier of second user equipment served by the second base station, indicating, by the second base station to the first base station, that the first identifier is the same as the second identifier; and adjusting, by the first base station, the first identifier to a third identifier, and sending the third identifier to the second base station.