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Terminal off-line direct calling method for digital centreless communication system

A communication system and terminal technology, which is applied in the call system of the near-field transmission system, multiplex communication, two-party line system station, etc., can solve the problem that the mobile station cannot communicate and contact, and achieve the effect of low development cost

Active Publication Date: 2007-12-19
SPREADTRUM COMM (SHANGHAI) CO LTD
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AI Technical Summary

Problems solved by technology

In some specific environments, such as remote areas, underground tunnels, rivers, lakes and seas, mobile operators do not have or cannot build base stations, so mobile stations in the GSM system will not be able to communicate

Method used

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  • Terminal off-line direct calling method for digital centreless communication system

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0027] The technology of the GSM system is used for reference to construct the terminal off-network direct call method of the digital centerless communication system. Divide spectrum resources into multiple frequency points. According to the regulations of the State Radio Regulatory Commission, the frequency band used by the centerless multi-channel site selection mobile communication system is 915.0125-916.9875MHz. The frequency band is divided into 9 frequency bands with a bandwidth of 200kHz, and the center frequencies of the 9 frequency points are 915+0.2×n MHz, where n represents a natural number from 1 to 9. For example, the fifth frequency band divided in the above manner is 915.9-916.1 MHz, and its center frequency is 916 MHz. In this way, the RF module of the existing GSM terminal can be set at these frequency points very conveniently.

[002...

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Abstract

This invention discloses a terminal Am having off-grid method for digital centerless communication system including: dividing a spectrum resource into multiple frequency points, defining control frequency points and service frequency points in said multiple frequency points, in which a synchronous channel, a paging channel and a control channel are distributed to the control frequency points and service channels are distributed to the service frequency points, determining modulation mode, dividing frames and time slots, designing structure of the frames and different users multiplex a same frequency point and TDMA mode is applied, one time slot on a frequency point is occupied for user talk to design process steps of Am having off-grid for terminal stations.

Description

technical field [0001] The invention relates to a terminal calling method in a communication system, in particular to an off-network direct calling method for a terminal in a digital centerless communication system. Background technique [0002] At present, the existing centerless communication system, that is, the walkie-talkie system is mostly analog, and its disadvantages are low spectrum utilization, small system capacity, and a single type of service, which can only be used to transmit voice, which is not conducive to the realization of data transmission. [0003] The current existing GSM communication system has overcome the above-mentioned various shortcomings, but it is a cellular mobile communication system with a center, and must have a central node, namely a base station. All mobile stations in this area can only communicate directly with the local base station. The base station is part of the access network. The access network is connected to the core network. Th...

Claims

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Application Information

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IPC IPC(8): H04Q5/24H04J4/00H04B5/04
Inventor 张严李夏庄嘉宜林敬东康一
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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