Secondary Serving Cell Addition via Random Access Coordination
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Solution Overview
Problem
In next-generation wireless networks, the connection between primary and secondary serving cells often experiences delays and limited capacity when they belong to different base stations, leading to issues with correct message transmission and reception, such as the primary base station not knowing when the secondary base station receives random access requests and the secondary base station lacking information about random access resource allocation messages.
Innovation Solution
A method where the terminal receives a random access resource allocation message from the primary base station, sends a random access request to the secondary base station using determined resources, and adjusts its time advance based on a time advance command received from the secondary base station, ensuring proper communication even when cells belong to different base stations or have long connection delays and low capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the primary serving cell and secondary serving cell belong to different base stations, then network coverage and capacity are improved, but message transmission reliability deteriorates due to connection delays and limited capacity
Solution Approach 1:
The patent introduces an intermediary mechanism where the primary base station acts as a mediator to forward critical random access information (preamble code, resource allocation) to the secondary base station. This ensures that the secondary base station has the necessary information to correctly receive and process random access requests from terminals, resolving the reliability issue while maintaining the dual-base-station architecture for improved coverage.
Solution Approach 2:
The patent applies preliminary action by having the primary base station pre-configure and transmit random access parameters (preamble code, resource allocation message) to the secondary base station before the terminal attempts random access. This advance preparation ensures that when the terminal sends the random access request, the secondary base station is already equipped with the necessary information to process it correctly, eliminating delays and information gaps.
2Adaptability or versatility
If connection delay between primary and secondary base stations is long, then network flexibility is improved, but communication performance deteriorates due to timing synchronization issues
Solution Approach 1:
The patent implements feedback mechanisms where the primary base station receives confirmation from the secondary base station about successful reception of random access requests. This feedback loop allows the primary base station to track the status of random access procedures across base stations, enabling it to manage terminal connections effectively despite connection delays and maintain timing synchronization.
Solution Approach 2:
The primary base station serves as an intermediary that coordinates timing between the secondary base station and the terminal. It receives random access parameters, forwards them appropriately, and uses the feedback from the secondary base station to manage the overall random access procedure, thereby compensating for connection delays and maintaining synchronization.
3Adaptability or versatility
If the backhaul link capacity between primary and secondary base stations is limited, then network scalability is improved, but information transmission completeness deteriorates
Solution Approach 1:
The patent extracts only the essential random access information (preamble code, resource allocation message, timing parameters) that needs to be transmitted from the primary base station to the secondary base station. By transmitting only these critical parameters rather than complete message content, the system reduces the information transmission load on the backhaul link while ensuring the secondary base station has sufficient information to process random access requests correctly.
Data Source
AI summary
The present invention provides a method for adding a secondary serving cell, an apparatus, a device, and a network system. The method includes: communicating, with each other to acquire a unified serial number of a random access preamble code, a unified serial number of a PRACH mask code, and a unified cell radio network temporary identifier of a terminal; scrambling the serial number of the random access preamble code and the serial number of the PRACH mask code, and then sending the serial number of the random access preamble code and the serial number of the PRACH mask code to the terminal; and determining, a time advance command TAC according to a random access request message that carries the random access preamble code, and sending the TAC to the terminal.