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TDD full-duplex method of digital non-center communication system terminal

A communication system, full-duplex technology, applied in the direction of duplex signal operation, sustainable communication technology, radio/induction link selection arrangement, etc., can solve the problem of high communication power consumption, reduced user comfort, and difficult power control problem, to achieve the effect of effective transmission bandwidth and reduction of communication power consumption

Inactive Publication Date: 2008-01-23
SPREADTRUM COMM (SHANGHAI) CO LTD
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Problems solved by technology

If the FDD full-duplex mode of GSM is used, the system can allow up to 32 pairs of users to talk at the same time; the use of half-duplex mode will reduce the comfort level of users, and it is not easy to achieve power control, which will increase the power consumption of the terminal
Among them, the principle of using GSM full-rate (including: TCH / FS, TCH / EFS) FDD full-duplex mode is shown in Figure 1. User 1 communicates with user 2, and each frame in the uplink and downlink of time is controlled by the pair User occupation, therefore, the transmission efficiency is not high, and the communication power consumption is also large
The principle of using GSM half-rate (including: TCH / HS, TCH / AHS, etc.) FDD full-duplex mode is shown in Figure 2. Users 1 and 3, and users 2 and 4 talk, and users 1 and 2 have different time slots in the same time slot. frame time communication, there are also the problems of low transmission efficiency and high communication power consumption

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  • TDD full-duplex method of digital non-center communication system terminal
  • TDD full-duplex method of digital non-center communication system terminal

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Embodiment Construction

[0028] The invention provides a TDD full-duplex method based on GSM half-rate coding between terminals of a digital centerless communication system. The method is that the receiving and sending parties use the GSM half-rate coding technology (TCH / HS or TCH / AHS), and Utilize the discontinuous transmission characteristics of data in the time domain to realize TDD time division duplex; the process includes the following steps:

[0029] A The receiving and sending parties first determine the receiving and sending order of odd and even frames;

[0030] B According to the order determined in step A, the receiving and transmitting parties alternately use the same frequency point and time slot.

[0031] The method further comprises the steps of:

[0032] (1) The call initiating station first detects the status of 8 service frequency points, and selects a suitable access frequency point and a time slot above it;

[0033] (2) The call originating station initiates a call request on th...

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Abstract

The present invention relates to a full duplex method among mobile terminals, in particular to a TDD full duplex method among centreless mobile system terminals based on GSM half-rate coding. In detail, a receiver and a transmitter utilize GSM half-rate coding technology and incontinuous transmission characteristics of data on a time domain to accomplish TDD (time division duplex) including procedures below: A. The receiver and the transmitter firstly confirm receiving and transmitting sequence of odd and even frames; B. The receiver and the transmitter alternatively use a same frequency point and time slot in sequence confirmed in the procedure A. The present invention removes inconvenience in that a system of prior arts (FDD full duplex of GSM) only allows 32 pairs of users to call synchronously and utilizes transmission bandwidth (allow 64 pairs of users to realize full duplex call) more effectively and reduces communication power consumption (realize quick power control between receiving and transmitting).

Description

technical field [0001] The invention relates to a full-duplex method between mobile terminals, in particular to a TDD full-duplex method based on GSM half-rate coding between terminals in a digital centerless communication system. Background technique [0002] According to the regulations of the State Radio Regulatory Commission, the frequency band used by the digital centerless mobile communication system is 915.0125 ~ 916.9875 MHz. In order to achieve better compatibility with the RF module of the existing GSM mobile station, the frequency band can be divided into 9 equal parts with a bandwidth of 200 kHz. Each frequency point is divided into periodic transmission frames with a unit of 4.615ms, and each frame is divided into 8 time slots (slot number 0~7), each time slot is 0.577ms . The center frequency of each frequency point is 915+0.2×(n+1) MHz respectively, where n represents an integer of 0-8. For example, the fourth frequency band divided in the above manner is 91...

Claims

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Application Information

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IPC IPC(8): H04L5/14H04Q7/32H04B7/005
CPCY02D30/70
Inventor 李夏张严邓红超林敬东
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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