Uplink Signal Timing Advance Separation for LTE Collision Avoidance
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Solution Overview
Problem
In wireless communication systems, particularly in LTE and LTE-A, the existing methods face challenges in efficiently transmitting uplink signals due to overlapping timing advance values between sounding reference signals (SRS) and physical uplink control/hybrid ARQ indicator channel (PUCCH/PUSCH) transmissions, leading to potential collisions and resource allocation ambiguities.
Innovation Solution
The proposed solution involves applying separate timing advance values to individual uplink channels or signals, where the difference between the timing advance values for SRS and PUCCH/PUSCH is greater than a preset value, allowing the SRS to be transmitted during a special subframe's uplink pilot time slot (UpPTS) period, while PUCCH/PUSCH is transmitted during a normal uplink subframe, thereby avoiding collisions and ensuring efficient resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate timing advance values are applied to SRS and PUCCH/PUSCH transmissions, then collision between uplink signals is avoided, but device complexity increases due to multiple timing advance value management
Solution Approach 1:
The patent divides the timing advance management into separate values for different uplink channels. Specifically, it applies a first timing advance value for SRS transmissions and a second timing advance value for PUCCH/PUSCH transmissions, thereby segmenting the previously unified timing advance parameter into channel-specific parameters to avoid collisions.
Solution Approach 2:
The patent introduces dynamic timing advance adjustment by allowing the system to switch between different timing advance values based on the channel type and transmission conditions. The timing advance values can be dynamically updated through timing advance commands from the base station, enabling adaptive timing management.
2Measurement precision
If SRS is transmitted during UpPTS period with larger timing advance value, then timing alignment for distant UE is achieved, but transmission time window becomes more constrained
Solution Approach 1:
The patent applies timing advance values in advance to compensate for propagation delay. By calculating and applying the appropriate timing advance value before transmission, the system ensures that signals from distant user equipment arrive at the base station aligned with the reception window, effectively pre-correcting for the time delay.
Solution Approach 2:
The patent changes the timing parameter by introducing different timing advance values for different channels and conditions. The system can adjust the timing advance value based on the user equipment's distance and channel requirements, transforming a fixed timing parameter into a flexible, condition-dependent parameter.
3Manufacturing precision
If timing advance values are differentiated by channel type, then resource allocation accuracy improves, but control signaling overhead increases
Solution Approach 1:
The patent makes the timing advance mechanism universal by applying the same timing advance command structure to multiple uplink channels (SRS, PUCCH, PUSCH). The base station can issue timing advance commands that are applicable across different channel types, reducing the need for separate control mechanisms for each channel.
Data Source
AI summary
A method for transmitting uplink signals from a user equipment to a base station in a time division multiplexing wireless communication system is disclosed. The method comprises the steps of transmitting a first uplink signal on an uplink subframe or a special subframe that precedes the uplink subframe, by preceding a first timing advance value at a reference time; and transmitting a second uplink signal on the uplink subframe by preceding a second timing advance value at the reference time, wherein the first timing advance value is greater than the second timing advance value, and the first uplink signal is transmitted for an uplink pilot time slot (UpPTS) period of the special subframe if a difference value between the first timing advance value and the second timing advance value is greater than a preset value.