Aperiodic SRS Carrier Segmentation for LTE Uplink Capacity
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Solution Overview
Problem
In LTE wireless communication systems, the increasing number of User Equipment (UEs) leads to saturation of channel measurement resource regions, reducing uplink capacity and limiting the transmission rate, as existing methods either reduce data channel capacity or interrupt conventional channel sounding reference signal transmission.
Innovation Solution
The method involves using two carriers for data and channel measurement, with the same transmission power, and employing unitary precoding for channel sounding reference signals, allowing simultaneous transmission without reducing data channel capacity and maintaining orthogonality between UEs, while dynamically controlling SRS bandwidth and scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If channel sounding reference signal regions are increased to support more UEs, then the number of UEs that can be measured increases, but uplink capacity is reduced
Solution Approach 1:
The patent divides the reference signal transmission into two separate carriers: one carrier dedicated for data transmission and another carrier for channel sounding reference signal transmission. This segmentation allows simultaneous operation of data channels and reference signals without resource conflicts, enabling support for more UEs while maintaining uplink capacity on the data carrier.
2Measurement precision
If reference signal bandwidth is increased to improve measurement resolution, then channel measurement accuracy improves, but available bandwidth for multiplexing is reduced
Solution Approach 1:
The patent moves the channel sounding reference signal transmission to a different frequency dimension by using a separate carrier. This allows the reference signal to occupy a dedicated bandwidth on the second carrier without competing with data channels on the first carrier, achieving high measurement resolution while preserving multiplexing capacity across the system.
3Reliability
If data transmission is interrupted to transmit channel sounding reference signals, then channel measurement can be performed, but data channel capacity is reduced
Solution Approach 1:
The patent segments the transmission resources by allocating different carriers for data and reference signals. This allows simultaneous transmission of both data channels and channel sounding reference signals without interruption, maintaining full data channel capacity while enabling reliable channel measurement through the dedicated reference signal carrier.
Data Source
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AI summary
Methods and apparatuses for generating a channel sounding reference signal in a wireless communication system are discussed. In one aspect, a method is provided for User Equipment (UE) in a wireless communication system to transmit a channel Sounding Reference Signal (SRS). The method includes receiving a control channel for uplink data channel transmission from a Base Station (BS); determining whether the control channel includes information for aperiodic channel SRS transmission; and when it is determined that the control channel includes information for aperiodic channel SRS transmission: transmitting uplink data through a first carrier; and transmitting the channel SRS through a second carrier; wherein the first carrier and the second carrier are transmitted simultaneously to the BS.