Uplink Transmission Collision Avoidance via Dynamic Timing Advance
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Solution Overview
Problem
In wireless communication systems, especially in 5G massive machine-type communication scenarios, collisions during uplink transmission between user equipment (UEs) are common, leading to network performance degradation due to the high probability of conflicts when multiple UEs access the network simultaneously.
Innovation Solution
The proposed solution involves user equipment (UE) sending multiple different preamble signals and receiving feedback signals from the network device, determining a valid timing advance (TA) that minimizes collisions, and using transmission parameters corresponding to non-colliding preamble signals for uplink data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple UEs send random access preamble sequences on the same time-frequency resource, then the random access process can be initiated, but collision occurs between UEs
Solution Approach 1:
The patent segments the single random access opportunity into multiple transmission attempts. The UE divides the random access process into several preamble transmission opportunities with different timing offsets, transforming a single high-collision event into multiple lower-collision events. This segmentation reduces the probability that multiple UEs will collide on the same resource simultaneously.
Solution Approach 2:
The patent introduces dynamic timing adjustment mechanisms where the UE can adjust the timing offset of subsequent preamble transmissions based on feedback from previous attempts. The system dynamically adapts the transmission parameters (timing advance values) to avoid fixed collision patterns, making the random access process more flexible and collision-resistant.
2Reliability
If collision resolution process is implemented through Msg3 and Msg4 exchange, then conflict can be resolved, but transmission delay increases
Solution Approach 1:
The patent performs preliminary collision avoidance actions before the actual data transmission phase. By sending multiple preambles with different timing offsets in advance and selecting the one with the best response, the UE prepares a collision-free transmission path beforehand. This preliminary selection reduces the need for lengthy Msg3/Msg4 conflict resolution exchanges later.
Solution Approach 2:
The patent enables the UE to skip the standard Msg3/Msg4 conflict resolution process by successfully resolving collisions at the preamble selection stage. When a preamble transmission succeeds without collision (indicated by receiving a valid RAR), the UE can proceed directly to data transmission, rushing through the normal random access procedure and reducing overall access delay.
3Device complexity
If UE uses fixed transmission parameters for uplink data, then simplicity is maintained, but collision probability with other UEs increases
Solution Approach 1:
The patent transforms fixed transmission parameters into dynamic adjustable parameters. The UE determines timing advance values and other transmission parameters based on the selected preamble and received RAR, allowing parameters to adapt to the specific transmission conditions. This dynamic adjustment reduces collision probability while maintaining reasonable system complexity through standardized adjustment rules.
Solution Approach 2:
The patent changes transmission parameters (particularly timing advance and frequency offsets) based on the preamble selection and network feedback. By modifying these parameters dynamically according to the selected random access resource and received timing advance commands, the system reduces collision probability without requiring complex adaptive algorithms, simply following standardized parameter adjustment procedures.
Data Source
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AI summary
This application provides an uplink transmission method, user equipment, and a storage medium. The method includes: sending, by user equipment UE, a plurality of different preamble signals to a network device; receiving, by the UE, a feedback signal of the network device in response to the plurality of preamble signals, where the feedback signal in response to each preamble signal carries a timing advance TA corresponding to the preamble signal; determining, by the UE, a valid TA from the plurality of received TAs; determining, by the UE based on a feedback signal carrying the valid TA or a preamble signal corresponding to the valid TA, a parameter used for uplink transmission; and sending, by the UE, uplink data according to the parameter. The technical solutions provided in this application can reduce a probability that a collision between UE and another UE occurs when the UE sends uplink data, thereby improving network performance.