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Reference signal transmission method, reference signal transmission device and base station

A reference signal and transmission method technology, applied in the field of base stations, reference signal transmission methods and devices, can solve the problems that hinder the large-scale development of the Internet of Things industry and cannot meet the requirements of ultra-low energy consumption of narrowband terminals, and achieve the scale of the Internet of Things industry The effect of modernized development and energy consumption reduction

Active Publication Date: 2017-08-01
CHINA MOBILE COMM GRP CO LTD
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  • Application Information

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Problems solved by technology

However, there is currently no reference signal mapping method suitable for the three deployment scenarios, which is not conducive to the formation of a single solution and hinders the large-scale development of the Internet of Things industry
[0004] The downlink common reference signal mapping method of the existing LTE system is not the optimal choice for the narrowband system, which requires the terminal to always receive the reference signal, which cannot meet the ultra-low energy consumption requirements of the narrowband terminal

Method used

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  • Reference signal transmission method, reference signal transmission device and base station
  • Reference signal transmission method, reference signal transmission device and base station
  • Reference signal transmission method, reference signal transmission device and base station

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Embodiment 1

[0070] The downlink common reference signal of the narrowband system adopts Figure 3a-Figure 3c In the mapping manner shown, only one OFDM symbol is set in a subframe to bear the common reference signal; the OFDM symbol bearing the common reference signal is located in the middle of the subframe as much as possible. In this embodiment, the OFDM symbol carrying the common reference signal is at least one of the following symbols:

[0071] The 7th OFDM symbol of the subframe, the 6th OFDM symbol of the subframe, and the 4th OFDM symbol of the subframe are respectively as follows Figure 3a-Figure 3c As shown in FIG. 3 , the time-frequency resource filled in the gray area is the downlink common reference signal.

[0072] In order to solve the problem of adjacent cell interference, in the embodiment of the present invention, for different cells, randomly select an OFDM The symbols carry a common reference signal.

[0073] In order to solve the problem of adjacent cell interfer...

Embodiment 2

[0081] The downlink common reference signal of the narrowband system still uses Figure 4a-Figure 4c The mapping method.

[0082] In order to solve the problem of adjacent cell interference, the common reference signal sequence shift is introduced, that is, for different cells, the identification sequence of the common reference signal carried is different.

[0083] In the embodiment of the present invention, for different cells, the order of the time-frequency resources carrying the common reference signal is set on the OFDM symbol carrying the common reference signal according to the cell identifier.

[0084] That is to say, for each reference signal on an OFDM symbol, it can be arranged in the frequency domain according to the identification of each reference signal, for example, a resource element (RE, Resource Element) contains 12 subcarriers, and each subcarrier carries a For reference signals with different identities, the different reference signals can be sorted acco...

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Abstract

The invention discloses a reference signal transmission method, a reference signal transmission device and a base station. The method comprises steps: common reference signals are loaded in an OFDM (Orthogonal Frequency Division Multiplexing) symbol in a sub frame for transmission, and only one OFDM symbol in one sub frame is used for loading the common reference signals. Thus, as downlink common reference signals are only loaded in one OFDM symbol in the sub frame, a receiving terminal can receive all downlink reference signals in as short a time as possible, and the energy consumption is reduced. The technical scheme of the invention is applicable to three deployment scenes, those are, stand-alone, in-band and guard-band modes for NB-IOT (Narrow Band-Internet Of Things), a single solution mode can be formed conveniently, and scale development of the Internet Of Things industry is better facilitated.

Description

technical field [0001] The invention relates to a downlink reference signal transmission technology in a narrowband system, in particular to a reference signal transmission method and device, and a base station. Background technique [0002] In the existing Long Term Evolution (LTE, Long Term Evolution) system, the mapping method of the downlink common reference signal is as follows figure 1 as shown, figure 1 The time-frequency resource block filled with oblique lines is the bearing position of the downlink common reference signal, and the downlink common reference signal is mapped to at least four Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) symbols in one subframe , and the downlink common reference signal is not continuous in the frequency domain. In the current Internet of Things communication, all adopt figure 1 The downlink common reference signal bearer method is shown, and because the narrowband Internet of Things ...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L5/00
CPCH04L5/0007H04L5/0048H04L27/261
Inventor 王锐张俪韩璐沈晓冬邵华
Owner CHINA MOBILE COMM GRP CO LTD
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