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Frequency hopping communication method for digital non-center communication system

A communication system and frequency hopping communication technology, applied in the field of business channel frequency hopping communication, can solve problems such as normal communication damage and inability to communicate normally, and achieve the effect of alleviating the impact

Active Publication Date: 2011-06-01
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

During the entire communication process, the receiving and transmitting stations always occupy a specific time slot on a certain frequency point for communication. When the occupied frequency point is in the position of frequency selective fading, it will cause great damage to normal communication. , or even cause a complete failure of normal communication, so it is necessary to take appropriate measures to overcome

Method used

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  • Frequency hopping communication method for digital non-center communication system
  • Frequency hopping communication method for digital non-center communication system

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Embodiment Construction

[0017] According to the regulations of the State Radio Regulatory Commission, the frequency band used by the digital centerless mobile communication system is 915.0125~916.9875MHz. In one embodiment, in order to achieve better compatibility with the existing GSM mobile station radio frequency module, the frequency band can be divided into 9 frequency points with a bandwidth of 200khz, and each frequency point is divided into 9 frequency points with a frame length of 4.615ms. Make 8 time slots (time slot numbers 0-7), each time slot is 0.577 ms, and the center frequency of each frequency point is 915+0.2×(n+1) MHz, where n represents an integer of 0-8. For example, the fourth frequency band divided in the above manner is 915.9-916.1 MHz, and its center frequency is 916 MHz.

[0018] All 9 frequency points of the digital centerless communication system can be divided into 1 control frequency point (for example, frequency point No. 8) and 8 service frequency points (for example, ...

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Abstract

The present invention discloses a frequency hopping communication method for digital centreless communication systems, which includes procedures below: Service frequency points are divided into one or a plurality of frequency hopping sequence sets. A calling broadcasting station detects state of each service frequency point and selects a frequency hopping sequence set of higher quality. After acquisition of time slot synchronization for the calling broadcasting station and a designated service frequency point, the calling broadcasting station initiates a call request to a called broadcasting station and transfers the call request to the designated service frequency point and the time slot. After receiving the call request from the calling broadcasting station, the called broadcasting station transfers to the service frequency point and the time slot designated by the call request of the calling broadcasting station. The calling broadcasting station communicates with the called broadcasting station on the designated frequency point and the time slot. Different call frames circularly use each service frequency point in a selected frequency hopping sequence set through frequency hopping until communication is finished. The method reduces impact of selective frequency attenuation on normal communication of broadcasting stations and improves communication efficiency.

Description

technical field [0001] The invention relates to a physical channel multiplexing method of a wireless communication system, in particular to a frequency-hopping communication method of a service channel of a digital centerless communication system. Background technique [0002] In the existing digital centerless communication system, without the control of the central node, direct communication can be realized between the terminals. Therefore, in a centerless communication system, the design of the structure, call signaling flow, and terminal status will affect the performance of the entire system. [0003] At present, the digital centerless communication system is mainly implemented based on the TDD (Time Division Duplex) digital communication system, which has a certain time slot structure, and its typical communication implementation mode is half-duplex. During the entire communication process, the receiving and transmitting stations always occupy a specific time slot on ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/7156
Inventor 邓红超林敬东张严李夏
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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