Random Access Response Signaling for On-Demand SIB Delivery
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Solution Overview
Problem
Existing wireless communication systems face challenges in reducing network energy consumption and latency associated with periodic broadcast of system information blocks, particularly in low-activity periods, leading to inefficient power usage and increased emissions.
Innovation Solution
Implementing an enhanced random access response (RAR) mechanism that consolidates downlink signaling messages for on-demand system information blocks, such as SIB1, by using an enhanced RAR PDU that includes scheduling information for the PDSCH, thereby reducing unnecessary transmissions of PDCCH and PDSCH for the on-demand SIB1.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If periodic broadcast of system information blocks is implemented, then network coverage and reliability are improved, but network energy consumption increases
Solution Approach 1:
The patent implements on-demand SIB transmission where the network node broadcasts system information blocks only when triggered by UE requests or specific network conditions, replacing traditional periodic broadcasting. This uses periodic action principle by activating transmission only at necessary intervals rather than continuously, reducing energy consumption while maintaining coverage reliability.
Solution Approach 2:
The UE autonomously requests system information blocks by transmitting PRACH when it determines SIB is needed, rather than relying on continuous network broadcasting. This self-service mechanism allows UEs to obtain necessary information on-demand, reducing overall network energy consumption while maintaining service reliability.
2Loss of information
If traditional random access procedure with separate PDCCH and PDSCH transmissions is used, then signaling completeness is improved, but latency increases
Solution Approach 1:
The patent merges the RAR PDSCH transmission with the on-demand SIB PDSCH transmission into a single PDSCH message. The RAR PDU includes both the random access response and the scheduling information for the on-demand SIB, eliminating the need for separate PDCCH and PDSCH transmissions. This combining approach reduces latency while maintaining complete signaling through the integrated message structure.
Solution Approach 2:
The enhanced RAR PDU serves multiple functions simultaneously: it provides random access response, includes scheduling information for on-demand SIB, and triggers the PDSCH transmission. This multi-functional approach consolidates what would traditionally require separate signaling messages, reducing latency while maintaining signaling completeness.
3Measurement precision
If multiple separate signaling messages (PDCCH and PDSCH) are transmitted for on-demand SIB, then signaling accuracy is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple signaling functions into a single enhanced RAR PDU transmitted via PDSCH. The PDU includes RAR information and SIB scheduling information in one message, reducing the number of separate PDCCH and PDSCH transmissions. This merging reduces device complexity for processing while maintaining signaling accuracy through the comprehensive integrated message structure.
Data Source
AI summary
Various aspects generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit, to a network node, a physical random access channel (PRACH) to request an on-demand system information block (SIB) including remaining minimum system information (RMSI). The UE may receive, from the network node in response to the PRACH, a random access response (RAR) protocol data unit (PDU) that includes information for the on-demand SIB. The UE may receive, from the network node, the on-demand SIB based at least in part on the information included in the RAR PDU. In some aspects, the UE may receive, from the network node in response to the PRACH, only a physical downlink control channel (PDCCH) for an RAR during an RAR window. The UE may receive, from the network node, the on-demand SIB based at least in part on the PDCCH for the RAR. Numerous other aspects are described.