Delay reduction method and apparatus
地域：
Shenzhen
摘要
This application discloses a delay reduction method and apparatus, applied to a random access process. The method includes: sending, by a terminal device, a message 1 to a network device, where the message 1 is a random access preamble; receiving, by the terminal device, a message 2 sent by the network device; and sending, by the terminal device, a message 3 to the network device, where a time gap between receiving the message 2 and sending the message 3 is set by the terminal based on a timing advance (TA) value. In an embodiment, the TA value is related to a message 1 format of the terminal device and a cell radius or subcarrier spacing supported by the message 1. In this solution, a TA value is reduced, and random access efficiency is improved.
說明書
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In this application, a quantity of indicated candidate TACs/indexes and a quantity of bits used for indication are not limited, and an indicated TAC value should be less than or equal to 3846, to reduce a time gap between a message 2 and a message 3.
Further, the indicated TAC or TA may be closest to a largest TAC or TA of one or more terminals within cell/beam coverage.
After receiving an index, the terminal determines the maximum TA based on the subcarrier spacing of the message 3. A calculation formula is as follows: Maximum TA=TAC*unit.
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