UE Connection Response Window Alignment for Random Access Latency
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Solution Overview
Problem
In wireless communication systems, the transmission of multiple connection requests during a connection response window can lead to increased latency due to misalignment between the user equipment (UE) and base station connection response windows, causing the UE to ignore connection responses and reinitiate transmission processes, thereby increasing latency.
Innovation Solution
Implementing techniques to align the UE connection response window with the base station connection response window by resetting the UE connection response window after each transmission opportunity, ensuring that both parties have a synchronized understanding of the response window timing, thereby preventing misalignment and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE transmits multiple connection requests during the connection response window, then the probability of establishing connection increases, but the misalignment between UE and base station connection response windows causes increased latency
Solution Approach 1:
The patent applies dynamics by making the UE connection response window variable rather than fixed. The window duration is dynamically adjusted based on the timing of multiple MSG1 transmissions, allowing the UE to extend the response window when multiple transmissions occur. This dynamic adjustment prevents misalignment and ensures the UE waits for the base station's connection response even when multiple connection requests were transmitted, thereby reducing unnecessary retransmissions and latency.
Solution Approach 2:
The patent changes the parameter of connection response window duration based on transmission conditions. When multiple MSG1 transmissions are detected, the UE modifies the response window parameter to extend it beyond the standard duration. This parameter change ensures proper synchronization with the base station's response timing, preventing the UE from prematurely closing the window and ignoring valid connection responses.
2Reliability
If the UE waits for connection response before retransmitting, then connection reliability improves, but the UE may miss the response if the window expires due to misalignment
Solution Approach 1:
The patent uses dynamics to adjust the response window timing based on actual transmission patterns. When multiple MSG1 transmissions occur within a standard window, the UE dynamically extends the response window duration to accommodate the base station's response timing. This dynamic extension ensures the UE does not prematurely expire the window and miss the connection response.
Solution Approach 2:
The patent implements feedback by having the UE monitor and detect multiple MSG1 transmissions. Based on this feedback about transmission patterns, the UE adjusts its response window behavior accordingly. The UE uses this feedback information to determine whether to extend the response window, ensuring proper synchronization with the base station's response timing.
3Device complexity
If the base station sets a fixed connection response window, then the window alignment is simple, but multiple MSG1 transmissions cause misalignment and reinitiation of transmission processes
Solution Approach 1:
The patent applies dynamics by making the response window adaptive rather than fixed. The UE dynamically adjusts the response window duration based on whether multiple MSG1 transmissions occurred. This dynamic approach maintains simplicity in the base station's fixed window setting while enabling the UE to adapt to multiple transmission scenarios, preventing misalignment and unnecessary reinitiation.
Solution Approach 2:
The patent uses preliminary action by having the UE detect and prepare for multiple transmission scenarios before they occur. The UE monitors transmission opportunities and pre-adjusts its response window settings based on detected patterns. This preliminary preparation ensures the UE is ready to handle multiple MSG1 transmissions correctly without requiring complex real-time adjustments during the response window period.
Data Source
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AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may transmit two or more connection requests prior to expiration of a UE connection response window. In some examples, the UE may re-set a UE connection response window each time the UE transmits a connection request. In some examples, the base station and UE may set their respective connection response windows after the UE transmits connections requests in a set of consecutive transmission opportunities. In some examples, the base station and UE may set their respective connection response windows based at least in part on a first available transmission opportunity. In some examples, the UE may include an indication of a position in a transmission sequence in the connection response, and the base station may set the UE connection response window based at least in part on the indication.