MsgB Channel Structure for Multiplexing RARs and HARQ Feedback
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently multiplexing multiple Random Access Responses (RARs) and Hybrid Automatic Repeat Request (HARQ) feedback signals within the limited space of the Physical Downlink Control Channel (PDCCH) component of the message B (msgB) channel structure, especially as the number of User Equipments (UEs) increases.
Innovation Solution
The proposed solution involves distributing the Physical Uplink Control Channel (PUCCH) signaling information across both the PDCCH and Physical Downlink Shared Channel (PDSCH) components of the msgB channel structure, using a common MAC sub-header to aggregate RARs and PUCCH signaling, and including signaling information for MAC sub-PDU combining to enhance HARQ processing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If PUCCH signaling information is included only in the PDCCH component of msgB, then the structure is simple, but the capacity to multiplex multiple RARs and HARQ feedback signals is limited
Solution Approach 1:
The PUCCH signaling information is segmented and distributed across both the PDCCH and PDSCH components of the msgB channel structure. This segmentation allows the system to maintain the simplicity of the PDCCH format while utilizing the PDSCH to carry additional PUCCH signaling information, thereby increasing the overall multiplexing capacity without concentrating all signaling in one component.
Solution Approach 2:
The solution moves PUCCH signaling information from a single dimension (PDCCH only) to multiple dimensions by also incorporating it into the PDSCH component. This dimensional expansion allows the system to accommodate multiple RARs and HARQ feedback signals simultaneously, effectively increasing the multiplexing capacity while distributing the complexity across different channel components.
2Quantity of substance
If DCI format size is increased to include more PUCCH signaling information, then more UEs can be served, but the processing overhead at UEs increases
Solution Approach 1:
The PUCCH signaling information is segmented between the PDCCH and PDSCH components, allowing the DCI format size to remain manageable while still serving multiple UEs. The PDSCH carries additional signaling information that supplements the PDCCH, enabling the system to address more UEs without proportionally increasing the DCI format size and associated processing overhead.
Solution Approach 2:
The PDSCH acts as an intermediary that carries additional PUCCH signaling information, reducing the burden on the PDCCH component. This intermediary role allows the system to serve more UEs by distributing signaling information across both channels, thereby reducing the processing energy consumption at UEs compared to including all signaling information in the DCI format.
3Productivity
If PUCCH signaling information is distributed across PDCCH and PDSCH, then multiplexing efficiency is improved, but the complexity of information distribution increases
Solution Approach 1:
The PUCCH signaling information is segmented and distributed across the PDCCH and PDSCH components, with each component carrying a portion of the signaling information. This segmentation improves multiplexing efficiency by allowing parallel transmission of RARs and HARQ feedback signals while managing distribution complexity through structured allocation of signaling information to appropriate channel components.
Solution Approach 2:
Both the PDCCH and PDSCH components are utilized to carry PUCCH signaling information, making each channel multi-functional. This universal approach improves multiplexing efficiency by leveraging the capabilities of both channels simultaneously, while the standardized distribution mechanism manages the complexity of information distribution across multiple components.
Data Source
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AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a base station (BS) may configure a physical downlink control channel (PDCCH) component of a message B (msgB) communication to include a first portion of the signaling information for physical uplink control channel (PUCCH) for hybrid automatic repeat request (HARQ) feedback associated with the msgB communication and the signaling information for HARQ combining of msgB. The BS may configure a physical downlink shared channel (PDSCH) component of the msgB communication to include a second portion of the signaling information for PUCCH and msgB HARQ combining. The distributed mapping for the signaling information to the PDCCH and PDSCH components of msgB can be indicated by system information, RRC signaling, or hard coded in specifications. The BS may transmit the msgB communication to one or more UEs. Numerous other aspects are provided.