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Sending method and receiving method of uploading demodulating pilot frequency, base station and moving relay

A demodulation pilot and mobile relay technology, which is applied in the receiving method, uplink demodulation pilot transmission method, base station and mobile relay field, can solve the frequency domain fading and time domain channel change of SC-FDMA system quickly , time fading, etc.

Inactive Publication Date: 2013-06-19
CHINA MOBILE COMM GRP CO LTD
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Problems solved by technology

In the LTE R8 system, the uplink air interface is based on single-carrier frequency division multiple access (SC-FDMA, Single-carrier Frequency Division Multiplex Access). Since the wireless channel is a fading channel, the high-speed movement of users will cause SC-FDMA system The time-domain channel changes quickly, resulting in time-selective fading; and multipath effects will cause frequency-domain selective fading in SC-FDMA systems

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  • Sending method and receiving method of uploading demodulating pilot frequency, base station and moving relay
  • Sending method and receiving method of uploading demodulating pilot frequency, base station and moving relay
  • Sending method and receiving method of uploading demodulating pilot frequency, base station and moving relay

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Embodiment Construction

[0073] At present, the speed of high-speed rail has reached 350km / h, the carrier of LTE-A is about 2.6G, and the Doppler frequency shift can reach 843Hz. However, the bandwidth of a subcarrier of the LTE system is only 15KHz. It can be seen that the Doppler effect cannot be ignored. The inter-carrier interference caused by the Le effect will bring obvious performance degradation to the system. In addition, the mobile relay is equivalent to a user terminal (UE) for the macro base station. Due to the small uplink transmission power and the high-speed movement of the user, the uplink interference of the backhaul link fluctuates greatly, which poses a great challenge to the accuracy of channel estimation and detection. high demands.

[0074] According to the high-speed environment test of the actual system by the inventor, the pilot density on some antenna ports is obviously insufficient, which requires the redesign of the uplink demodulation pilot (DMRS) in the PUSCH for the spec...

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Abstract

The invention provides a sending method and a receiving method of an uploading demodulating pilot frequency, a base station and a moving relay. The sending method comprises that the base station sends configuration information of uploading demodulation reference signal (DMRS) on a downloading passing-back chain path to the moving relay; the configuration information comprises information used for indicating positions of an uploading DMRS symbol, wherein the number of SC-FDMA symbols occupied by the uploading DMRS symbol in the time domain direction of a sub-frame is larger than 2; the base station detects PUSCH from an uploading passing-back chain path, and receives the uploading DMRS sent by the moving relay from the PUSCH according to the configuration information of the uploading DMRS; and the base station uses the received DMRS to demodulate. Because the uploading demodulating pilot frequency is repeatedly designed, accuracy of channel estimation of a relay pass-back chain path is improved under a high-speed moving condition.

Description

technical field [0001] The present invention relates to the technical field of Long Term Evolution (LTE) and LTE-A, in particular to an uplink demodulation pilot (DMRS, Demodulation reference signal) sending method, receiving method, base station and mobile relay. Background technique [0002] In the LTE system, the evolved base station (eNB) is connected to the core network through optical fiber backhaul, the relay node (RN, Relay Node) is connected to the eNB through a wireless interface, and the UE is connected to the RN or eNB through a wireless interface; between RN and eNB The link in is the trunk backhaul link. [0003] A reference signal (RS, Reference Signal), also known as a pilot signal, is a known signal provided by a transmitting end to a receiving end for channel estimation or channel detection. In the LTE R8 system, the uplink air interface is based on single-carrier frequency division multiple access (SC-FDMA, Single-carrier Frequency Division Multiplex Acce...

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Application Information

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IPC IPC(8): H04L25/02H04W88/08
CPCH04L27/26H04L5/0051H04L27/2613H04L27/2636H04L27/2647H04L27/26136
Inventor 刘建军闫渊韩璐沈晓冬杨宁刘光毅
Owner CHINA MOBILE COMM GRP CO LTD
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