Method for random access in cellular communication system

Abstract

The invention discloses a random access method in honeycomb communication system and is used for ensuring uplink synchronization in the process of a terminal starting random access without conflicts when a base station in honeycomb communication system restores the downstream data sending. In the random access process, the random access responding message of the base station responding to the terminal at least comprises time advance and the authorization message sent to the base station from uplink wireless resource; then the terminal receives the random access responding message and sends a confirmation message to the base station through the uplink wireless resource. The invention also provides a clear management strategy to the special random access fronting in the random access process. The invention ensures that the base station can correctly know whether the terminal receives the synchronous message and ensures the smooth operation of sending downstream data; simultaneously, owing that the special random access fronting has a clear management strategy, thus effectively saving resource and avoiding the divergence between the terminal and the special-used fronting.

Description

technical field [0001] The invention relates to an access technology in a mobile communication system, in particular to a random access method in a cellular communication system. Background technique [0002] Such as figure 1 As shown, the cellular wireless communication system is mainly composed of terminals, base stations and core networks. A network composed of base stations is called a radio access network (Radio Access Network, RAN for short), and is responsible for access layer affairs, such as management of radio resources. There can be physical or logical connections between base stations according to the actual situation, such as figure 1 Base station 1 and base station 2 or base station 3 in . Each base station can be connected to one or more core network nodes (Core Network, CN for short). The core network is responsible for non-access stratum affairs, such as location updates, and is the anchor of the user plane. A terminal refers to various devices that can...

AI Technical Summary

Problems solved by technology

However, if terminal A does not receive the random access response message, terminal A will probably re-initiate random access using this dedicated random access preamble. Since this dedicated access preamble has been allocated to terminal B, the two The random access preamble message sent by the terminal may cause conflicts. For these two terminals, the random access process is actually no longer a conflict-free process.

For the base station, terminal A may be mistaken for terminal B, resulting in failure of the random access process between terminal A and terminal B

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