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Method and equipment for distributing resources and sending channel state information pilot signal

A technology of channel state information and pilot signal, which is applied in the field of communication and can solve problems such as strong interference

Active Publication Date: 2011-06-29
CHINA MOBILE COMM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In order to avoid strong interference from the pilots of adjacent cells on the same RE, the REs carrying UE-SpecificPort5-RS need to shift the pilot frequency according to the CellID of the cell in the frequency domain, but if the UE-SpecificPort5-RS in the PRB of a cell After the CSI-RS is inserted on the OFDM symbol where the Specific Port5-RS is located, it may cause strong interference between the inserted CSI-RS and the UE-Specific Port5-RS after the pilot frequency shift

Method used

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  • Method and equipment for distributing resources and sending channel state information pilot signal

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Embodiment 2

[0072] Embodiment 2 of the present invention proposes a method for sending CSI-RS, such as Image 6 As shown, the method includes:

[0073] Step 201: Select an RE bearing a CSI-RS in a PRB of a target cell.

[0074] Step 202: Determine the pilot frequency shift amount of the target cell according to the Cell ID of the target cell.

[0075] Step 203: Frequency-shift the REs carrying the CSI-RS in the PRBs of the target cell according to the determined pilot frequency shift amount, and obtain the REs carrying the CSI-RSs in the PRBs of the target cell after the frequency shift.

[0076] Steps 201 to 203 are the same as steps 101 to 103 in Embodiment 1. After step 203, the RE that carries the UE-Specific Port5-RS in the PRB of the target cell can also be performed according to the determined pilot frequency shift amount. frequency shift steps.

[0077] Step 204: Instruct the base station of the target cell to send the CSI-RS to the UE through the obtained RE bearing the CSI-RS a...

Embodiment 3

[0086] Among the three adjacent cells in Embodiment 3 of the present invention, cell 1 is a serving cell of UE_A, and cell 2 and cell 3 are cells adjacent to cell 1 . In this embodiment, the RE carrying the CSI-RS selected in the PRB of cell 1 is the RE in the 11th OFDM. Embodiment 3 of the present invention does not select the RE in the OFDM where UE-Specific Port5-RS and DM-RS are located, but selects the RE in the 11th OFDM. In Embodiment 3 of the present invention, it can be regarded as proposing a A new method of resource allocation and CSI-RS transmission, that is, the REs allocated to CSI-RSs are obtained after pilot frequency shifting of REs carrying CSI-RSs, and CSI-RSs are transmitted through the allocated REs.

[0087] In the 11th OFDM in the PRB of cell 1, 8 REs are selected to carry CSI-RS. The labels of these 8 REs are respectively a~h, and the mode of the RE selected in cell 1 is: the 11th 8 REs in OFDM. According to the RE selection mode in cell 1, 8 REs of t...

Embodiment 4

[0090] Among the three adjacent cells in Embodiment 4 of the present invention, cell 1 is a serving cell of UE_A, and cell 2 and cell 3 are cells adjacent to cell 1 . In this embodiment, the REs carrying CSI-RS selected in the PRB of cell 1 are 6 REs in the 11th OFDM and 6 REs in the 4th OFDM where the UE-Specific Port5-RS is located. The 6 REs in the 11th OFDM are labeled "b, d, f, h, j, i", and the 6 REs of the CSI-RS in the 4th OFDM where the UE-Specific Port5-RS is located are " a, c, e, g, i, k".

[0091] The pattern of REs selected by the CSI-RS in cell 1 is: 6 REs in the 11th OFDM and 6 REs in the 4th OFDM where the UE-Specific Port5-RS is located. The same pattern is selected in cell 2 and cell 3, that is, 12 REs of the same pattern (Pattern) are selected in cell 2 and cell 3 to carry CSI-RS.

[0092] Assuming that according to the formula It is calculated that: the pilot frequency shift of cell 1 is 1, the pilot frequency shift of cell 2 is 2, and the pilot freque...

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Abstract

The invention provides a method and equipment for distributing resources and sending a channel state information pilot signal. The invention discloses a method and equipment for distributing resources for a CSI-RS (channel state information-reference signal) and a method and equipment for sending a CSI-RS. The method mainly comprises the following steps: after the pilot carrier frequency shift amount of a target cell is determined according to the Cell ID (identity) of the target cell, frequency shift is carried out on RE (Resource Element) carrying the CSI-RS in a PRB (Physical Resource Block) according to the determined pilot carrier frequency shift; and because the RE carrying the CSI-RS and the RE carrying a UE (user equipment)-Specific Port5-RS adopt the same algorithm for frequency shift, the CSI-RS subjected to frequency shift and the UE-Specific Port5-RS subjected to frequency shift have no interference.

Description

technical field [0001] The present invention relates to the field of communication, in particular to a method, system and device for allocating resources for Channel State Information-Reference Signal (CSI-RS) in a wireless communication environment, and a method for transmitting CSI-RS methods and equipment. Background technique [0002] The wireless channel is a fading channel. When data is transmitted through Orthogonal Frequency Division Multiplex (OFDM) symbols, the expansion of multipath delay will cause Inter-Symbol Interference (ISI), while in When receiving data through a wireless channel in a mobile state, the frequency shift caused by the Doppler effect will destroy the orthogonality between the subcarriers of the OFDM system, causing Inter Carrier Interference (ICI). Therefore, it is necessary to insert a pilot signal (Reference Signal, RS) into the transmitted signal, so that the receiving end can perform channel estimation or channel detection according to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W72/04H04B7/26
Inventor 刘建军王启星史志华刘光毅
Owner CHINA MOBILE COMM GRP CO LTD
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