A tdd communication method

A communication method and signal technology, applied in the field of TDD communication, can solve the problems of low system capacity and long communication coverage distance, and achieve the effects of ensuring communication distance, increasing received power, and increasing uplink user capacity

Active Publication Date: 2018-07-20
SHANGHAI TAOLINK TECHNOLOGIES CORPORATION
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Problems solved by technology

[0002] At present, the uplink and downlink of long-distance low data rate M2M wireless communication adopt spread spectrum communication. Although spread spectrum communication can achieve a long communication coverage distance, the system capacity is low.

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Embodiment Construction

[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0025] The duplex mode of the communication method of the present invention adopts TDD, the transmission of the downlink cycle and the uplink cycle are carried out alternately, and the working bandwidth is B, specifically, 200kHz. Downlink, the signal occupies the entire bandwidth B. Uplink, from node to base station, adopts narrowband single-carrier communication technology, each channel bandwidth is B C , the entire bandwidth B is divided into C≤B / B C channels. The end point of the downlink communication time is taken as the starting point (time 0), and S=T is divided u / T slot time slots, nodes can be in the time interval 0 to T u Start sending a signal at any time slot between, T slot is the slot period, typically T u 100ms, typical T slot 0.25ms, typical S is 400.

[0026] In this embodiment, a node is configured with on...

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Abstract

The invention relates to a TDD communication method. The method includes that a node selects a channel and a time slot S randomly before sending signals, detects the channel from the time slot 0 until the selected time slot S about whether transmitting signals from other node appear or not, and sends the signals if no other signals are detected or power of signals sent by the other nodes is not greater than a threshold value H; a base station performs channel estimation on each 1 / D fraction symbol point in all channels and judges whether the fraction symbol points have the signals transmitted by the node or not based on a channel estimation result; the base station generates a wave beam for the node and receives the node signal if the signal transmitted by the node is detected; the base station sends a signal through frequency expansion communication after receiving all signals transmitted by the node in the time slot; and the node receives the signals through frequency expansion communication. According to the invention, each channel can receive signals transmitted by a plurality of users at the same time, so that upstream user quantity is increased substantially.

Description

technical field [0001] The present invention relates to a communication method, specifically a TDD communication method, and belongs to the technical field of long-distance and low data rate machine-to-machine communication (M2M). Background technique [0002] At present, the uplink and downlink in the long-distance low data rate M2M wireless communication adopt the spread spectrum communication method. Although the spread spectrum communication can achieve a long communication coverage distance, the system capacity is low. Therefore, in order to meet the requirements of M2M communication, it is necessary to achieve ultra-long communication coverage distance and accommodate a large number of machine communication users, and in the long-distance low data rate M2M communication, it is especially necessary to solve the problem of uplink communication user capacity. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies of the a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/06H04B7/08H04L25/02H04B1/71
CPCH04B1/71H04B7/0617H04B7/086H04L25/0202H04W4/70
Inventor 屈代明刘景顺汪志冰何辉
Owner SHANGHAI TAOLINK TECHNOLOGIES CORPORATION
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