Communication Window State Synchronization Using Control PDUs
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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 discards 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, using control PDUs without assigned RLC sequence numbers to maintain synchronization and reduce communication overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the base station uses a single RLC AM transmitter to transmit content to multiple UEs, then resource utilization is improved, but state variable synchronization between UEs and base station deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where UEs report their state variable values (such as RX_Next, RX_Highest_Status) to the base station. The base station uses this feedback to determine appropriate window adjustment values and sends adjustment commands back to UEs, ensuring synchronized state variables while maintaining efficient resource utilization through the single transmitter architecture
Solution Approach 2:
The patent introduces window adjustment commands as an intermediary mechanism between the base station transmitter and UE receivers. These commands mediate the synchronization process by providing explicit instructions for adjusting state variables, bridging the gap between the centralized transmitter and distributed receivers to maintain synchronization
2Ease of operation
If the UE maintains a communication window using local state variables, then communication autonomy is improved, but synchronization with the base station deteriorates
Solution Approach 1:
The UE maintains autonomous communication window management through local state variables while periodically providing feedback to the base station about its current state. The base station responds with window adjustment commands that guide the UE's state variable updates, preserving both autonomy and synchronization
Solution Approach 2:
The communication window management is made dynamic through explicit window adjustment commands that allow the UE to adapt its state variables in real-time based on base station instructions. This dynamic adjustment mechanism enables the UE to maintain autonomy while staying synchronized with the base station's transmit window
3Reliability
If the UE discards packets outside the communication window, then data integrity is improved, but packet loss increases
Solution Approach 1:
The patent applies preliminary action by proactively adjusting the communication window boundaries through window adjustment commands before packets fall outside the window. This prevents packet loss by ensuring the window remains positioned to capture incoming packets, maintaining both data integrity and reducing unnecessary discards
Data Source
AI summary
This disclosure provides systems, methods, and apparatuses, including computer programs encoded on computer storage media, for wireless communication. In one aspect of the disclosure, a user equipment (UE) is configured to manage a state variable (associated with a radio link control (RLC) entity or a packet data convergence protocol (PDCP) entity) that enables the UE to maintain synchronization with a base station during a communication session. For example, a base station may transmit, to the UE, a control PDU or a synchronization PDU that includes a value of a state variable maintained by a base station to enable the UE to update its state variable to maintain synchronization with the base station. Other aspects and features are also claimed and described.