Terminal Sounding Reference Signal Transmission via Dynamic Carrier Selection
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Solution Overview
Problem
In wireless communication systems, particularly in next-generation mobile communication technologies like LTE-Advanced, terminals face challenges in transmitting sounding reference signals when carrier aggregation or cooperative transmission is employed, as the conventional method requires a linked uplink carrier for downlink data channels, which may not be available during sounding reference signal transmission.
Innovation Solution
A method and apparatus for a terminal to transmit a sounding reference signal by receiving carrier information, receiving a physical downlink shared channel through a first downlink component carrier, and transmitting the sounding reference signal through a second uplink component carrier, even if the first downlink component carrier is not linked with an uplink component carrier by system information, or if uplink transmission is not set during the subframe for the sounding reference signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal transmits the sounding reference signal through the uplink carrier linked by the downlink carrier via system information, then the transmission follows conventional protocols, but the transmission fails when the linked uplink carrier is not available or not set up at the time of sounding reference signal transmission
Solution Approach 1:
The patent introduces a new intermediary mechanism: the PDCCH from the downlink carrier serves as a mediator to trigger SRS transmission on a different uplink carrier than the one traditionally linked via system information. This allows the terminal to use an alternative uplink carrier (second uplink carrier) when the conventional linked carrier is unavailable, thereby resolving the contradiction between maintaining conventional transmission protocols and adapting to carrier aggregation/cooperative transmission scenarios.
Solution Approach 2:
The patent implements dynamic carrier selection for SRS transmission. Instead of statically linking SRS to a specific uplink carrier through system information, the system dynamically determines which uplink carrier to use based on real-time conditions. The PDCCH includes dynamic indicators that specify which uplink carrier should be used for SRS transmission in each subframe, allowing flexible adaptation to carrier aggregation and cooperative transmission scenarios.
2Productivity
If the terminal receives a data channel through a downlink carrier without a linked uplink carrier, then carrier aggregation is utilized, but the terminal cannot transmit the sounding reference signal according to conventional methods
Solution Approach 1:
The PDCCH acts as an intermediary that bridges the gap between downlink data reception and uplink SRS transmission. When the terminal receives a PDSCH through a downlink carrier without a linked uplink carrier, the PDCCH includes dynamic indicators that specify an alternative uplink carrier for SRS transmission, enabling the terminal to maintain SRS transmission capability even in carrier aggregation scenarios where the conventional linked carrier is unavailable.
3Adaptability or versatility
If the uplink transmission is not set in the subframe when the sounding reference signal needs to be transmitted, then the uplink carrier is available, but the sounding reference signal cannot be transmitted through the linked uplink carrier
Solution Approach 1:
The system dynamically selects the uplink carrier for SRS transmission based on real-time availability. The PDCCH includes dynamic indicators that specify which uplink carrier should be used for SRS in each subframe. When the traditionally linked uplink carrier is not configured for transmission in a given subframe, the dynamic indication directs the terminal to use an alternative uplink carrier that is available, ensuring continuous SRS transmission capability.
Data Source
AI summary
Provided is a method for transmitting a sounding reference signal by a terminal, and a terminal using the method. The method comprises the following steps: receiving carrier information indicating the carrier via which a sounding reference signal is to be transmitted; receiving a physical downlink shared channel (PDSCH) through a first downlink component carrier; and transmitting a sounding reference signal through a second downlink component carrier, wherein the second downlink component carrier is determined based on the carrier information.