Multiplexing Periodic Channel Information for Multiple Serving Cells
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Solution Overview
Problem
In LTE rel-11, channel information transmission for multiple serving cells can collide within a single sub-frame, leading to resource wastage and suboptimal scheduling due to the limitation of transmitting only single periodic channel information per serving cell, especially when up to five serving cells are supported.
Innovation Solution
Implementing a method that allows the terminal to transmit periodic channel information for multiple serving cells using the UCI PUSCH operation mode, which activates PUSCH transmission instead of PUCCH when transmission time instants coincide, thereby preventing resource wastage and enabling optimal scheduling by multiplexing and encoding channel information according to serving cell indices and types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal transmits periodic channel information for multiple serving cells using separate PUCCH resources, then each serving cell can have its channel information transmitted independently, but transmission collisions occur within a single sub-frame when up to five serving cells are supported, leading to resource wastage
Solution Approach 1:
The patent merges multiple periodic channel information transmissions for different serving cells into a single PUSCH transmission when transmission time instants coincide. Instead of using separate PUCCH resources that would collide, the terminal multiplexes channel information for multiple serving cells into one PUSCH transmission, eliminating resource wastage while maintaining reliable transmission of all channel information.
Solution Approach 2:
The patent introduces PUSCH as an intermediary resource to resolve the collision between multiple PUCCH transmissions. When periodic channel information for multiple serving cells is scheduled to transmit simultaneously, the system uses PUSCH as a mediator to carry the multiplexed channel information, avoiding the resource wastage that would occur with traditional PUCCH-based separate transmissions.
2Device complexity
If the terminal transmits only single periodic channel information per serving cell in one sub-frame, then transmission complexity is reduced, but the data transmission quantity is limited and optimal scheduling cannot be achieved
Solution Approach 1:
The patent makes the PUSCH channel multi-functional by enabling it to carry both data transmissions and periodic channel information for multiple serving cells simultaneously. This universal approach allows a single transmission resource to serve multiple purposes, increasing data transmission quantity without proportionally increasing transmission complexity.
Solution Approach 2:
The patent adds a new dimension to channel information transmission by utilizing the PUSCH resource dimension instead of being constrained to PUCCH resources only. This dimensional shift allows multiple serving cells' channel information to be transmitted together in one sub-frame, significantly increasing productivity while managing complexity through standardized multiplexing procedures.
3Duration of action of stationary object
If the terminal activates PUCCH for periodic channel information transmission, then channel information can be transmitted periodically, but resource wastage occurs when transmission time instants for multiple serving cells coincide
Solution Approach 1:
The patent implements a dynamic transmission mechanism where the terminal adaptively switches between PUCCH and PUSCH resources based on whether transmission time instants coincide. When no collision occurs, periodic PUCCH transmission is used; when collision occurs, PUSCH transmission is activated. This dynamic approach maintains periodic transmission capability while eliminating resource wastage.
Solution Approach 2:
The system uses feedback mechanisms to detect when transmission time instants for periodic channel information coincide across multiple serving cells. Based on this feedback, the terminal dynamically adjusts its transmission strategy, switching from PUCCH to PUSCH when necessary, thereby preventing resource wastage while maintaining reliable periodic transmission.
Data Source
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AI summary
A method for transmitting channel information is provided, the method comprising: identifying information related to a period and an offset on channel status information for each of multiple serving cells; and transmitting the channel status information for the multiple serving cells on a sub-frame based on the identified information, if (a) a UE is configured with more than one cell, (b) a collision occurs between the channel status information for the multiple serving cells, and (c) the channel status information for the multiple serving cells are a same priority.