Handoff Data State Transfer in Wireless Transceivers
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Solution Overview
Problem
In wireless communication systems, handoffs between transceiver modules can lead to data packet loss and sequence errors due to the lack of seamless data transmission and state information transfer, especially when access terminals move between different transceiver modules with varying signal quality.
Innovation Solution
A tiered network architecture where the network module provides IP-encapsulated data packets to transceiver modules, which fragment and frame them according to the Radio Link Protocol (RLP) for over-the-air transmission, ensuring that data packets are transmitted in the correct sequence by coordinating with each other during handoffs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data packets are transmitted during handoff between transceiver modules, then data transmission continuity is maintained, but data packet loss and sequence errors occur due to lack of state information transfer
Solution Approach 1:
The source transceiver module performs preliminary actions by packaging state information (including data buffer status, transmission sequence, and acknowledgment information) into a handoff message before the handoff occurs. This allows the target transceiver module to receive and process the state information in advance, ensuring seamless continuation of data transmission without packet loss or sequence errors.
Solution Approach 2:
The network module acts as an intermediary that receives the handoff message from the source transceiver module and forwards it to the target transceiver module. This intermediary ensures reliable state information transfer by managing the handoff process centrally, coordinating the transition, and guaranteeing that the target module receives accurate state information to maintain data packet sequence.
2Reliability
If state information is transferred during handoff, then data packet sequence is maintained, but handoff process complexity increases due to additional signaling requirements
Solution Approach 1:
Multiple state information elements (data buffer status, transmission sequence, acknowledgment information) are merged into a single handoff message structure. This consolidation reduces the number of separate signaling interactions required during handoff, simplifying the overall process while maintaining complete state information transfer for data packet sequence maintenance.
Solution Approach 2:
The handoff message serves multiple functions simultaneously: it transfers state information, maintains data packet sequence, and coordinates the handoff process between source and target transceiver modules. This multi-functionality reduces the need for separate signaling mechanisms, thereby reducing overall handoff complexity while achieving reliable data transmission continuity.
3Productivity
If transceiver modules operate independently, then system simplicity is maintained, but seamless handoff cannot be achieved leading to data transmission interruptions
Solution Approach 1:
The network module serves as a coordinating intermediary that manages handoff between transceiver modules. It receives state information from the source module, processes the handoff request, and delivers the information to the target module. This centralized coordination enables seamless handoff and continuous data transmission efficiency while keeping individual transceiver modules relatively simple in design.
Data Source
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AI summary
Described herein are mechanisms and methods that facilitate seamless handoff of an access terminal between access points (transceiver modules). A first transceiver module can be providing forward link data services to an access terminal when it requests a handoffto a second transceiver module. In response, the first transceiver module can provide data that is desirably transmitted to the access terminal to the second transceiver module. A network module can inform a plurality of transceiver modules that the second transceiver module is servicing the access terminal, and can further provide data to the second transceiver module for transmittal to the access terminal.