SIB Transmission Redundancy Version 0 for CCA Delay Reduction
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Solution Overview
Problem
In communication technologies, if an access network device fails to perform the first clear channel assessment in a SIB period, it cannot send the SIB with redundancy version number 0, leading to delays for user equipment (UE) in receiving correct system information, as it must wait for the next SIB period.
Innovation Solution
The access network device sends the SIB in N time units within one SIB period, with the redundancy version number 0 in the first time unit, ensuring that even if the first CCA fails, the UE can still receive the SIB with version number 0, which includes a large quantity of information bits for improved decoding performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the access network device sends SIB with redundancy version number determined by sequential CCA success in each subframe group, then the channel access follows standard procedure, but the UE experiences increased delay when the first CCA fails
Solution Approach 1:
The patent applies preliminary action by pre-determining that the SIB in the first time unit of the SIB period will carry redundancy version number 0, regardless of CCA outcomes. This allows the UE to always expect and decode the complete SIB information from the first time unit without needing to wait for subsequent time units or SIB periods, thereby reducing reception delay while maintaining reliable channel access procedures
2Loss of time
If the access network device sends SIB with redundancy version number 0 in the first time unit, then the UE can receive complete information bits without delay, but the channel access may conflict with other transmissions
Solution Approach 1:
The patent applies dynamics by making the actual transmission of the predetermined redundancy version number 0 SIB contingent on successful CCA. The system dynamically adjusts between the predetermined information structure and actual channel conditions, allowing the UE to know what to decode while the access network device maintains flexibility to adapt to real-time channel availability and avoid interference with other transmissions
Data Source
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AI summary
Embodiments of the present invention relate to the field of communications technologies and provide a method for transmitting system information, an apparatus, and a system, to reduce a delay in obtaining correct system information by a terminal device. The method includes: generating a system information block SIB; and sending the SIB in N time units in one SIB period, where a redundancy version number of the SIB sent in the first time unit in the N time units is 0; the SIB period includes T time unit groups, and the T time unit groups include TP candidate SIB sending time unit groups, where TP ≤ T; one time unit group includes a time units used for a clear channel assessment CCA; and one time unit group in the TP time unit groups includes r candidate SIB sending time units, where N is a total quantity of candidate SIB sending time units included in a time unit group in which a CCA succeeds in the TP candidate SIB sending time unit groups in the SIB period, N≤TP×r, and T and TP are positive integers.