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Data communication method, data communication device and base station

A data communication and quantity technology, applied in the field of communication, can solve the problems of increasing overhead, high proportion of time occupied by CP, and reducing transmission efficiency.

Active Publication Date: 2017-05-31
BEIJING SPREADTRUM HI TECH COMM TECH CO LTD
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Problems solved by technology

[0004] However, in the case of multiple subcarrier spacings coexisting in the same subframe, due to the different lengths of OFDM symbols under different subcarrier spacings, OFDM symbols under all subcarrier spacings use the same length of CP, then for length comparison For short OFDM symbols, the proportion of time occupied by CP is relatively high, and CP cannot be used to transmit data, so it will increase overhead and reduce transmission efficiency

Method used

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  • Data communication method, data communication device and base station
  • Data communication method, data communication device and base station
  • Data communication method, data communication device and base station

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Embodiment Construction

[0032] As mentioned in the background art, in the prior art, when multiple subcarrier intervals coexist in the same subframe, since the lengths of OFDM symbols under different subcarrier intervals are different, the OFDM symbols under all subcarrier intervals use the same For a CP with a longer length, for a shorter OFDM symbol, the proportion of time occupied by the CP is relatively high, and the CP cannot be used to transmit data, so it will increase the overhead and reduce the transmission efficiency.

[0033] The inventor has analyzed the prior art as follows. In the LTE system, a cyclic prefix needs to be added before each OFDM symbol. As long as the sum of the multipath delay and timing error of each path does not exceed the CP length, the integer waveform of each subcarrier contained in the receiver integration interval under each path can be guaranteed, thereby eliminating inter-symbol interference caused by multipath And Inter-Channel Interference (ICI) between sub-carri...

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Abstract

The invention relates to a data communication method, a data communication device and a base station. The data communication method comprises the steps of determining the cascading number N of OFDM (Orthogonal Frequency Division Multiplexing) symbols according to the coverage, the receiver processing performance and the current sub-carrier spacing, wherein the N is a positive integer; determining the length of a cyclic prefix corresponding to the current sub-carrier spacing according to the current sub-carrier spacing and the cascading number N of the OFDM symbols; and sending the cascading number N of the OFDM symbols and the length of the cyclic prefix to a user terminal so as to enable an OFDM sequence adopted in performing communication with the user terminal to contain N OFDM symbols and a single cyclic prefix. The technical scheme improves the data transmission efficiency.

Description

Technical field [0001] The present invention relates to the field of communication, in particular to a data communication method, device and base station. Background technique [0002] In the Long Term Evolution (LTE) system, each Orthogonal Frequency Division Multiplexing (OFDM) symbol includes a Cyclic Prefix (CP). By adding CP, the interference between OFDM symbols can be avoided, and the signal interference between subcarriers in each OFDM symbol can be eliminated at the same time, so as to realize a simple channel equalization operation. The choice of CP length is often defined according to system coverage requirements. In the existing long-term evolution LTE network, there are two types of normal cyclic prefix (Normal Cyclic Prefix, NCP) and enhanced cyclic prefix (Extended Cyclic Prefix, ECP). When the cell coverage area is large, it needs to be supported by ECP. [0003] In the prior art, since the subcarrier interval is fixed at 15KHz, the length of the OFDM symbol is a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2601H04L5/0044
Inventor 徐志昆
Owner BEIJING SPREADTRUM HI TECH COMM TECH CO LTD
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