Base Station Timing Advance Detection for 100 km LTE Coverage
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Solution Overview
Problem
Existing LTE systems face challenges in supporting communication beyond a cell radius of 100 km without altering the standardized protocol, leading to inefficiencies in data transmission due to increased resource allocation for longer random access signals.
Innovation Solution
A method for a base station to determine a timing advance (TA) value by detecting random access signals from user equipment (UE) during multiple observation periods, allowing for uplink synchronization and expanding cell coverage without changing UE operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the cell radius is expanded by increasing the lengths of cyclic prefix and guard time in random access channel, then the cell coverage distance is improved, but the resource allocation amount increases and data transmission efficiency deteriorates
Solution Approach 1:
The patent dynamically adjusts the observation period length based on the detected random access signal timing. By making the observation period adaptive rather than fixed, the system can accommodate larger cell radii without permanently increasing resource allocation, thus maintaining data transmission efficiency while expanding coverage
Solution Approach 2:
The patent changes the timing parameter (observation period length) based on the detected signal characteristics. When a random access signal is detected later in the subframe, the observation period is extended accordingly, allowing the system to support larger cell radii through parameter adjustment rather than structural changes to the random access channel format
2Length of stationary object
If the observation period is extended to detect random access signals from distant UEs, then the cell coverage is improved, but the timing advance value accuracy may deteriorate due to increased delay variation
Solution Approach 1:
The patent performs preliminary detection of random access signals within the extended observation period and identifies the specific timing of detected signals. By detecting and recording the actual arrival time of random access signals from distant UEs, the system can calculate accurate timing advance values despite the extended observation window, maintaining measurement precision while expanding coverage
Data Source
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AI summary
The present disclosure relates to a method and apparatus for transmitting and receiving signals in a wireless communication system. According to an embodiment of the present disclosure, random access signals including preamble sequences transmitted from a user equipment (UE) may be detected during a plurality of observation periods. A temporary timing advance (TA) value may be determined based on a preamble sequence of a random access signal having greater signal strength among the plurality of random access signals detected in the plurality of observation periods. A final TA value may be acquired based on the temporary TA value according to a result of comparison between the strengths of the random access signals received in the plurality of observation periods and a preset threshold value. A random access response signal including the final TA value may be transmitted to the UE.