UE State Variable Synchronization via Control Messages
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Solution Overview
Problem
In wireless communication systems, synchronization issues arise between user equipment (UE) and base stations due to desynchronization of state variables during unicast or multicast communication sessions, leading to packet loss and communication failures.
Innovation Solution
The UE initializes state variables to initial values and receives control messages with current values from the base station to synchronize the communication window, allowing for timely updates and maintaining synchronization through control PDUs without assigned RLC sequence numbers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the base station uses a single RLC AM transmitter to transmit content to multiple UEs in P2M communication, then resource utilization is improved, but state variable synchronization between UE and base station deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the base station transmits feedback indicators (such as ACK/NACK information) to UEs to convey state variable synchronization status. This allows UEs to adjust their receive windows based on feedback from the base station, maintaining synchronization despite the base station serving multiple UEs simultaneously. The feedback loop enables the system to maintain reliability while utilizing a single transmitter for multiple UEs.
Solution Approach 2:
The patent introduces control messages as intermediaries that carry state variable information between the base station and UEs. These control messages act as a mediator to transfer synchronization status and adjust window positions, enabling the base station to maintain state variable synchronization across multiple UEs without requiring separate transmitters for each UE.
2Ease of operation
If the UE re-initializes state variables to initial values during handover or session resumption, then communication session recovery is improved, but synchronization with the base station deteriorates
Solution Approach 1:
The patent implements preliminary actions by having the base station prepare and transmit state variable synchronization information to the UE before or during the handover process. This allows the UE to pre-synchronize its state variables with the base station, ensuring that when the UE re-initializes during handover, it can quickly recover synchronization without losing alignment with the base station's transmit window.
Solution Approach 2:
The patent uses feedback mechanisms where the base station provides state variable information to the UE during handover procedures. This feedback enables the UE to adjust its re-initialized state variables to match the base station's current state, maintaining synchronization while allowing the UE to recover from handover or session resumption events.
3Speed
If the UE maintains a communication window using local state variables, then packet reception speed is improved, but packet loss increases when desynchronized with base station
Solution Approach 1:
The patent implements feedback where the base station transmits state variable synchronization information to the UE. This feedback allows the UE to maintain its local communication window for fast packet reception while periodically adjusting the window position based on feedback from the base station, preventing packet loss due to desynchronization.
Solution Approach 2:
The patent makes the UE's communication window dynamic by allowing it to adjust its position and size based on received state variable information from the base station. The UE maintains a local window for fast reception but dynamically repositions it according to base station feedback, combining the benefits of fast local processing with synchronization-based reliability.
Data Source
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AI summary
A method for wireless communication performed by a user equipment (UE), is provided, the method comprising: receiving a control message generated at a network entity, the control message indicating a value of a state variable maintained by the network entity, the state variable associated with a communication window of a communication session established with the network entity; setting, based on the control message, the state variable to the value from a previous value in accordance with a lack of synchronization between the UE and the network entity; and receiving data associated with the communication session within the communication window based on the value of the state variable. Further, a corresponding apparatus and a method and an apparatus for a network entity communicating with the UE are provided.