PUCCH Multiplexing HARQ-ACK and Scheduling Requests
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Solution Overview
Problem
In wireless communications, particularly in 5G NR systems, coordinating the feedback of multiple uplink control information (UCI) pieces over a single uplink channel is challenging due to the uplink single-carrier feature, where only one uplink channel can be sent simultaneously, necessitating efficient methods to manage and multiplex UCI feedback.
Innovation Solution
A communication method where a terminal device receives downlink control information to determine cyclic shifts for sequences on overlapping time-domain symbols of physical uplink control channels (PUCCH), allowing multiple UCI pieces, such as HARQ-ACK and scheduling requests, to be carried on a single PUCCH by using pre-defined mapping relationships and pseudo-random number determinations to ensure timely and efficient communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple PUCCHs are simultaneously sent in frequency division manner, then multiple UCI pieces can be transmitted, but the uplink single-carrier feature cannot be maintained
Solution Approach 1:
The patent merges multiple PUCCH transmissions into a single PUCCH by multiplexing multiple UCI pieces (HARQ-ACK, SR, CSI) on one uplink channel using time-domain symbols and cyclic shifts, thereby maintaining the uplink single-carrier feature while achieving multiple UCI transmissions
Solution Approach 2:
The patent transitions from frequency-division multiplexing to time-domain multiplexing by utilizing different time-domain symbols and cyclic shift values to carry multiple UCI pieces on a single frequency resource, thus preserving the single-carrier constraint while enabling multi-UCI transmission
2Adaptability or versatility
If only one PUCCH is sent at a time, then the uplink single-carrier feature is maintained, but multiple UCI pieces cannot be simultaneously transmitted
Solution Approach 1:
The patent segments multiple UCI pieces into different time-domain symbols within a single PUCCH transmission, with each symbol carrying specific UCI information identified by cyclic shifts, enabling simultaneous transmission of multiple UCIs while maintaining single-carrier operation
Solution Approach 2:
The patent introduces cyclic shifts as an intermediary mechanism to differentiate and identify multiple UCI pieces transmitted on the same time-frequency resource, allowing the single PUCCH to carry multiple UCIs without requiring separate frequency resources
3Productivity
If multiple PUCCHs are coordinated through complex multiplexing, then multiple UCI pieces can be carried on one channel, but the complexity of determining cyclic shifts and parameters increases
Solution Approach 1:
The patent enables self-service by allowing the terminal to autonomously determine cyclic shifts and parameters based on pre-configured mapping relationships between UCI types and cyclic shift values, without requiring complex network coordination or additional signaling overhead
Data Source
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AI summary
This application relates to the field of wireless communications, and in particular, to a communication method, an apparatus, and a system in a wireless communications system. In the method, a terminal device receives downlink control information that is sent by a network device and that indicates a first physical downlink control channel PUCCH, where the first PUCCH and a second PUCCH occupy a same first time-domain symbol, and the first PUCCH and a third PUCCH occupy a same second time-domain symbol; and the terminal device sends the first PUCCH, where the first PUCCH carries a first sequence and a second sequence, a cyclic shift of the first sequence is determined based on a hybrid automatic repeat request-acknowledgment HARQ-ACK value and state information of a scheduling request SR corresponding to the second PUCCH, and a cyclic shift of the second sequence is determined based on the HARQ-ACK value and state information of an SR corresponding to the third PUCCH. According to the method, an HARQ-ACK and a plurality of SRs can be multiplexed on a same PUCCH for reporting, thereby improving communication efficiency and performance.