Cell Change Packet Relay via Status Transfer
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Solution Overview
Problem
In cellular radio communication systems, efficient packet data transmission during cell changes is hindered by the need for retransmission of data packets, which burdens physical radio resources and increases management overhead, as base stations were limited to the physical layer and lacked responsibility for managing data packets post-transmission.
Innovation Solution
The method involves relaying data packets from one radio cell to another and transferring status information from the first base station to the second, allowing continued transmission without retransmission of data packets, with options for status information transfer through the base station network, subscriber station, or internal transfer within the base station, minimizing radio interface load and enabling efficient error correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data packets are retransmitted during cell change, then data integrity is maintained, but physical radio resources are burdened and management overhead increases
Solution Approach 1:
The invention applies preliminary action by transferring status information about data packets from the source base station to the target base station before the cell change is completed. This allows the target base station to have advance knowledge of which data packets need to be transmitted or retransmitted, eliminating the need for redundant retransmissions and optimizing radio resource usage during the handover process
Solution Approach 2:
The invention uses an intermediary mechanism where status information acts as a mediator between the source and target base stations. This status information contains details about transmitted data packets, allowing the target base station to make informed decisions about retransmission without directly communicating with the source base station, thereby reducing overhead and improving efficiency
2Device complexity
If base stations are limited to physical layer functions, then device complexity is reduced, but ability to manage data packets during cell change is insufficient
Solution Approach 1:
The invention applies universality by enabling base stations to perform multiple functions beyond just physical layer operations. Base stations are equipped with status memory units and logic to derive and transfer status information, allowing them to participate in data packet management and coordination during cell changes, thus making them multi-functional entities in the network
Solution Approach 2:
The invention applies segmentation by separating the status information management function from the data transmission function. The base station is divided into distinct components: transmission units for data packets, status memory units for storing status information, and derivation logic for generating status data. This modular approach allows enhanced capability without proportionally increasing overall complexity
3Productivity
If status information is transferred between base stations, then retransmission overhead is reduced, but network complexity increases
Solution Approach 1:
The invention applies taking out by extracting only the essential status information needed for efficient cell change management, rather than transferring all data packet contents or complete transmission states. The status memory units store and transfer only critical information such as packet acknowledgment states and sequence numbers, reducing the complexity of the transfer mechanism while maintaining productivity benefits
Data Source
AI summary
A method for packet-switched transmission of data. A first base station associated with a first radio cell is used to at least partially transmit data packets in a second sequence to at least one subscriber station by at least one first radio channel. The at least one subscriber station sorts out the received data packets into a first sequence in an intermediate storage unit and the base station associated with the first radio cell is used to derive and/or represent status information relating to the content of the intermediate storage unit in a status memory unit. Transmission of the data packets is relayed from the first to the second radio cell and data packets are transmitted by a base station associated with the second radio cell to the at least one subscriber station by at least one other radio channel. The status information is transferred from the base station associated with the first radio cell to the base station associated with the second radio cell.