Direct SR ID Encoding in NR PUCCH UCI
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Solution Overview
Problem
In wireless communication networks, particularly in the New Radio (NR) system, there is a challenge in efficiently communicating Scheduling Requests (SR) from User Equipment (UE) to the network node without overlapping with Physical Uplink Control Channel (PUCCH) transmissions, which leads to unnecessary overhead and indirect identification of triggered SRs.
Innovation Solution
Direct encoding of the Scheduling Request ID in the Uplink Control Information (UCI) is implemented, where additional bits are added to the UCI for PUCCH formats 2, 3, or 4 to indicate the triggered SR ID, and for PUCCH format 0, an initial cyclic offset is used to encode the SR ID, allowing direct identification of the logical channel with new data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Scheduling Request (SR) is transmitted separately from UCI on PUCCH, then SR can be identified indirectly through PUCCH resource mapping, but this causes overlapping transmissions and increases overhead
Solution Approach 1:
The patent merges SR indication with UCI transmission by encoding SR ID directly into the UCI payload. Instead of transmitting SR separately on dedicated PUCCH resources, the SR information is combined with other uplink control information (such as HARQ-ACK and CSI) and transmitted together in a single PUCCH resource, eliminating resource overlap and reducing transmission complexity
Solution Approach 2:
The PUCCH resource configured for UCI transmission is made multi-functional by enabling it to carry both UCI data and SR indication simultaneously. The same PUCCH resource that transmits HARQ-ACK or CSI can also convey SR status through encoded bits, making the transmission mechanism universal and eliminating the need for separate SR-dedicated resources
2Adaptability or versatility
If PUCCH resources are allocated for both UCI and SR, then both functions can be supported, but resource overlap causes interference and reduces spectral efficiency
Solution Approach 1:
The patent combines SR indication with UCI transmission in the same time-frequency resources. By encoding SR ID bits into the UCI payload, the system eliminates the need for separate SR PUCCH resources, thereby avoiding resource overlap and the associated interference between simultaneous transmissions
Solution Approach 2:
The SR indication function is extracted from the separate PUCCH SR transmission mechanism and integrated into the UCI transmission framework. This extraction allows SR information to be conveyed through the existing UCI channel without requiring additional dedicated resources, thus eliminating harmful interference
3Productivity
If SR ID is indicated indirectly through PUCCH resource selection, then multiple SRs can be multiplexed, but this increases overhead and reduces identification efficiency
Solution Approach 1:
The patent extracts the SR indication from the indirect resource-based mechanism and implements direct SR ID encoding within the UCI payload. By allocating specific bits in the UCI to represent SR ID, the system eliminates the overhead associated with indirect indication methods while maintaining the ability to identify multiple triggered SRs efficiently
Solution Approach 2:
The patent changes the parameter representation method from indirect resource indexing to direct SR ID bit encoding. By modifying how SR information is parameterized in the transmission (from resource selection to explicit bit fields), the system reduces overhead and improves identification efficiency while maintaining full SR multiplexing capability
Data Source
AI summary
In New Radio, NR, when a SR PUCCH resource to which a triggered SR is mapped overlaps with a PUCCH carrying UCI, such as HARQ-ACK and/or CSI, an indication of the corresponding schedulingRequestID, which determines the logical channel ID with new data, is directly encoded in the UCI. That is, rather than directly transmit the relevant SR PUCCH resource(s), which indirectly identifies the SR ID, an indication of the SR ID is directly transmitted on the PUCCH transmission. The encoding of an indication of SR ID may comprise adding bits to UCI to be transmitted, for PUCCH formats 2, 3, or 4. For PUCCH format 0, encoding the indication of SR ID comprises adding an initial cyclic offset indicating the triggered SR.