Method for terminal random access to cellular wireless communication system and group identifier generation method

Abstract

The utility model relates to a method for random access of terminal to cellular wireless communication system and creating group identifier, comprising following steps: a random time slot with a terminal in a wireless frame sends random access fronting information to a base station; the base station combines location information in the random time slot of the wireless frame and a frequency domain into a group identifier, adds the group identifier with a individual identifier into responding information, and sends the information to the terminal; the terminal judges if the group identifier and the individual identifier of random receiving information are expected value, if does, the terminal sends information and message to the base station on the uplink wireless resource. The utility model has the advantages that the group identifier that the random access responding information can be identified without SFN reading, which is important for random access during switching process, and the method is available for any configuration of the random access time slot.

Description

technical field [0001] The invention relates to a cellular wireless communication system, in particular to a method for a terminal to randomly access the cellular wireless communication system and a method for generating a group identifier. Background technique [0002] As shown in Figure 1, the cellular wireless communication system is mainly composed of terminals, base stations and core network. A network composed of base stations is called a radio access network (Radio Access Network, RAN), and is responsible for access layer affairs, such as management of radio resources. There may be physical or logical connections between base stations according to actual conditions, such as base station 1 and base station 2 or base station 3 in FIG. 1 . Each base station can be connected to one or more core network nodes (Core Network, CN). The core network is responsible for non-access stratum affairs, such as location updates, and is the anchor of the user plane. A terminal refer...

AI Technical Summary

Problems solved by technology

However, in practical applications, for example, the terminal may not know the SFN of the target cell in advance during the handover process, which makes it impossible to calculate the group identity. In order to obtain the SFN of the target cell, additional delay and system processing are often required, such as reading system messages, Because SFN is usually broadcast in system messages

Another shortcoming is that in the actual wireless communication system, the configuration of the random access channel is flexible and changeable, so it is difficult to specify a fixed time range that makes the group identity unique

If the time range is notified by means of system message broadcast, for example, the flexibility of system configuration may be increased, but it also means that the terminal needs to read this parameter every time it initiates a random access request, and system message broadcast The cycle is often relatively long, so it will increase the time for the terminal to access the cell

Another problem is that using the absolute position method in the frequency domain will lead to redundant information bits of the group ID, because generally speaking, not all uplink radio resources will be set as random access resources in a TTI; and, if If the uplink random access channel adopts a method similar to frequency hopping, the absolute position will change with time, thus increasing the complexity of group identification coding and the probability of error

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