Referring to FIG. 3C, the network-side device is a gNB in 5G NR, the terminal is UE in 5G NR, the cached data acquired by the terminal is a set (called this data) of data cached in an RLC layer and data cached in a PDCH layer in the UE, a PUCCH resource used to transmit an SR for the third data is a short-duration PUCCH resource, a second parameter of the PUCCH resource is a resource block identifier of the PUCCH resource, information of the second parameter specifically includes short-duration PUCCH C1, short-duration PUCCH C2 and short-duration PUCCH C3, a first parameter of the third data is a data size of the cached data, information of the first parameter specifically includes three different levels, i.e., a low level, a middle level and a high level, and a mapping relationship, pre-configured by the UE through a high layer of a protocol stack, between information of a first parameter and information of a second parameter is shown in Table 3.
TABLE 3
PUCCH resource block identifier
Data size of cached data
Short-duration PUCCH C1
High level
Short-duration PUCCH C2
Middle level
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