Mobile Station Uplink Channel State Information Feedback
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Solution Overview
Problem
In existing mobile station apparatuses, there is a lack of efficient channel state information transmission during retransmissions, leading to mismatched information between the mobile station and base station, especially in aperiodic transmissions and HARQ processes, resulting in suboptimal communication control.
Innovation Solution
The mobile station apparatus generates and transmits a positive acknowledgement for uplink data along with reacquired channel state information when receiving a transmission grant that indicates retransmission, ensuring that channel state information is updated and matched to the current channel conditions for efficient communication control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If channel state information is transmitted only at initial transmission without retransmission, then transmission overhead is reduced, but communication quality and scheduling accuracy deteriorate
Solution Approach 1:
The patent applies dynamics by making the channel state information transmission adaptive to the transmission state. The mobile station determines whether to transmit channel state information based on whether it is an initial transmission or retransmission, and whether the transmission was successful. This dynamic adjustment allows the system to optimize between overhead reduction and communication quality based on actual transmission conditions.
Solution Approach 2:
The patent changes the parameter of transmission content based on transmission state. For initial transmissions, channel state information is transmitted; for successful retransmissions, only acknowledgment is sent; for failed retransmissions, channel state information is reacquired and transmitted again. This parameter change strategy resolves the contradiction by adjusting what is transmitted based on the specific transmission scenario.
2Ease of operation
If channel state information is not updated during retransmission, then transmission simplicity is maintained, but scheduling accuracy and communication efficiency deteriorate
Solution Approach 1:
The patent implements feedback by having the mobile station reacquire channel state information when retransmission occurs. The base station sends feedback information indicating the transmission result, and the mobile station uses this feedback to determine whether to reacquire and transmit updated channel state information. This feedback mechanism ensures scheduling accuracy while maintaining operational simplicity through automated decision-making.
Solution Approach 2:
The patent applies preliminary action by having the mobile station prepare and transmit channel state information in advance for initial transmissions. For retransmissions, the system uses the previously transmitted channel state information as a baseline and only updates it when necessary, based on feedback about transmission success. This preliminary preparation reduces the need for continuous updates while maintaining efficiency.
3Device complexity
If aperiodic transmission grant does not include channel state information transmission indication, then grant simplicity is maintained, but channel state information transmission reliability deteriorates
Solution Approach 1:
The patent applies universality by making the transmission grant serve multiple functions. The grant not only indicates the transmission timing and resources but also includes an indication field that specifies whether channel state information transmission is required. This multi-functional grant structure maintains simplicity while ensuring reliable channel state information transmission through the inclusion of transmission indication information.
Solution Approach 2:
The patent uses feedback from the base station's transmission grant to guide the mobile station's behavior. The grant includes feedback information about the transmission result, which the mobile station uses to determine whether to reacquire and transmit channel state information. This feedback mechanism ensures reliable channel state information transmission while keeping the grant structure relatively simple through standardized indication fields.
Data Source
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AI summary
In case that an uplink grant from a base station apparatus is detected on PDCCH, a data designated by the uplink grant, channel state information measured at the time of transmission are transmitted by PUSCH as an uplink transmission signal. Then, in case that a notice that indicates retransmission is received, the data to be retransmission and the channel state information measured at the time of retransmission are transmitted by PUSCH. Accordingly, the mobile station apparatus can transmit appropriate channel state information when designated to retransmission so that the base station apparatus can make an efficient communication control (scheduling) between the base station apparatus and the mobile station apparatus that is suitable for the current channel condition.