A method and device for sending and receiving system messages

Abstract

The invention provides a method and apparatus for sending and receiving system messages wherein the method comprises: determining the transmission block size (TBS) of a system message of a community and / or whether the community is compatible with coverage enhancement; according to the corresponding relationship between the protocol agreed time domain resource position and the transmission block size (TBS) of a system message of a community and / or whether the community is compatible with coverage enhancement, determining the time domain resource position corresponding to the transmission block size (TBS) of the system message of the community and / or whether the community is compatible with coverage enhancement; and sending again the system message of the community at the determined time domain resource position in the scheduling period of the system message of the community. According to the invention, without the extra indicative messages into an MIB, the time domain resource of the system message can be adjusted according to the transmission block size (TBS) of the system message of the community and / or whether the community is compatible with coverage enhancement so as to strike an effective balance between system resource consumption and the time required by the user to obtain the system message.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a method and device for sending and receiving system messages. Background technique [0002] System information in an LTE (Long Term Evolution, long-term evolution) system is divided into MIB (Master Information Block, master information block) and SIB (System Information Block, system information block). MIB is carried by PBCH (Physical Broadcast Channel, physical broadcast channel), and the transmission block size is 24 bits, of which 14 bits are used to carry system frame number, downlink cell bandwidth, PHICH (Physical HARQ Indication Channel, physical hybrid automatic request retransmission indication channel) information, and the remaining 10 bits are idle bits. The SIB is carried by a PDSCH (Physical Downlink Shared Channel, Physical Downlink Shared Channel), and carries system information not covered by the PBCH. [0003] SIBs are classified accor...

AI Technical Summary

Problems solved by technology

However, according to Table 1 and Table 2, it can be seen that different MTC SIB1 transport block sizes and the cell's support for coverage enhancement will greatly affect the number of repetitions required by MTC SIB1

If the time-domain resource location of MTC SIB1 specified in the protocol is determined according to a larger TBS and / or coverage enhancement, then for the case that the actual transmission block of MTC SIB1 is small and the cell does not support coverage enhancement, MTC SIB1 There is redundancy in the transmission resources, which leads to the waste of system resources; on the contrary, if the time domain resource position of MTC SIB1 specified in the agreement is determined according to the smaller TBS and / or normal coverage, the actual transmission of MTC If the SIB1 transmission block is large and there are terminals that need coverage enhancement in the cell, there will be a large delay for the terminal to obtain MTC SIB1, which will result in the need to extend the modification cycle of the system information, or the terminal may merge the MTC SIB1 across the modification cycle of the system information. , MTC SIB1 receiving error will occur when the system message changes

Images