Uplink Sounding Reference Signal Timing Collision Prevention
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Solution Overview
Problem
In wireless communication networks with a large number of antennas, timing collisions occur due to varying propagation delays and different timing advances required for uplink sounding reference signals (SRS) transmission, leading to potential collisions and inefficiencies in channel synchronization.
Innovation Solution
The method involves generating and scheduling uplink symbols, including SRS, on different beam pairs with specific timing advances, and adjusting symbol durations or inserting guard intervals to prevent collisions, ensuring synchronized transmission and reception of signals across multiple antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink sounding reference signals are transmitted on multiple beam pairs with different timing advances, then channel synchronization is improved, but timing collisions occur between symbols transmitted on different beam pairs
Solution Approach 1:
The patent calculates timing collision risks in advance before scheduling SRS transmissions on different beam pairs. By performing preliminary timing analysis and adjusting symbol durations or scheduling decisions beforehand, the system prevents timing collisions from occurring, rather than attempting to resolve them after they happen.
Solution Approach 2:
The patent dynamically adjusts the duration of uplink symbols based on the specific timing advance values assigned to different beam pairs. Symbol durations are not fixed but are adapted in real-time to match the timing requirements of each beam pair, allowing simultaneous transmissions without collisions.
2Object-generated harmful factors
If symbol duration is adjusted to prevent timing collisions, then timing collision prevention is improved, but transmission efficiency decreases due to shorter effective symbol duration
Solution Approach 1:
The patent applies different symbol durations to different uplink symbols transmitted on different beam pairs, rather than using a uniform duration for all symbols. Each symbol's duration is locally optimized to prevent timing collisions only where needed, while other symbols can maintain their full duration and transmission efficiency.
Solution Approach 2:
The patent changes the duration parameter of uplink symbols dynamically based on the timing advance values and beam pair assignments. By adjusting this single parameter (symbol duration) in response to timing conditions, the system prevents collisions without requiring fundamental changes to the transmission framework.
3Object-generated harmful factors
If guard intervals are inserted to prevent timing collisions, then timing collision prevention is improved, but transmission overhead increases
Solution Approach 1:
The patent performs preliminary calculations to determine whether timing collisions will occur between scheduled SRS transmissions on different beam pairs. By predicting collisions in advance, the system can choose to adjust symbol durations instead of always inserting guard intervals, reducing unnecessary overhead.
Solution Approach 2:
The patent adjusts the duration parameter of uplink symbols as an alternative to inserting guard intervals. By changing the symbol duration parameter to match timing advance differences, the system prevents timing collisions without adding the overhead of guard interval sequences.
Data Source
AI summary
Methods for preventing timing collisions in a wireless communication network include transmitting a data uplink symbol of normal duration via a first base pair using a first timing advance (TA) corresponding to the first base pair. Scheduling to transmit a second uplink symbol via a second base pair (BP) corresponding to the transmit RF chain. Predicting a timing collision will occur based on a different between the first TA and a second TA corresponding to the second BP. Preventing the timing collision by: reducing the duration of the second symbol by an adjustment amount calculated based on the first TA and the second TA; inserting a guard interval to delay transmission of the second symbol by the calculated adjustment amount; and increasing the duration of a cyclic prefix of the second symbol but refraining from transmitting a portion of the enlarged CP.