Inter-cell cooperative transmission method and base station based on user feature space information interaction
A cooperative transmission and spatial information technology, applied in transmission systems, digital transmission systems, radio transmission systems, etc., can solve problems such as massive MIMO systems that cannot apply the JSDM transmission scheme, do not know the user grouping situation, and cannot estimate the effective channel matrix.
Inactive Publication Date: 2020-01-17
SHANGHAI RES CENT FOR WIRELESS COMM
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However, since user k does not know the grouping of users in cell 2 and the user-specific downlink DM-RS in each user group (used for channel estimation by users), user k cannot estimate the effective channel between it and base station 2 matrix
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[0028] The technical content of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0029] The invention proposes an inter-cell cooperative transmission method based on user feature space similarity grouping. First, user k uses the subspace estimation and tracking algorithm in the downlink training phase to estimate the main feature space between it and each cell l And feed back to its serving base station at a low frequency. Then, the serving base station of user k associates user k with the main feature space of each cooperative cell l Notify each cooperative cell l. Based on this, cooperative cell l according to user k's main feature pattern Grouping user k may be assigned to the existing user group of cell l, or may be divided into a new independent group. Moreover, the base station of cell 1 allocates user-specific downlink pilot resources (DL UE-specificDM-RS) to the user group of user k...
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The invention discloses an inter-cell cooperation transmission method based on user feature space information interaction, and a base station. The method comprises the following steps that a user estimates a main feature space mode between the user and a cooperation cell base station, and transmits the main feature space mode to a service base station; the service base station receives the main feature space mode, and notifies the cooperation cell base station of the main feature space mode; the cooperation cell base station distributes downlink pilot frequency resources to the user according to the main feature space mode, and transmits the downlink pilot frequency resources to the service base station; the service base station notifies the user of the downlink pilot frequency resources; the user measures an effective channel matrix between the user and the cooperation cell base station based on the downlink pilot frequency resources, and transmits the effective channel matrix to the service base station; the service base station calculates a pre-coding matrix based on the main feature space mode and the effective channel matrix, wherein the pre-coding matrix is used for signal transmission. According to the invention, the method can achieve the high-efficiency inter-cell cooperation transmission.
Description
technical field [0001] The invention relates to an inter-cell cooperative transmission method based on user feature space information interaction, and also relates to a base station for realizing the inter-cell cooperative transmission method, which belongs to the technical field of wireless communication. Background technique [0002] LTE-Advanced technology introduces coordinated multi-point transmission and reception (Coordlinated Multi-Point transmission / reception, abbreviated as CoMP), through joint scheduling or coordinated transmission between multiple cells, the interference to the coordinated cell can be greatly reduced, so that The receiving signal performance of the receiving user equipment can be improved, and the spectrum efficiency of the edge user can be greatly and effectively improved. The mainstream traditional solutions are introduced below. [0003] In a cellular wireless communication system, users at the edge of a cell are interfered by cooperative cel...
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IPC IPC(8): H04B7/0413H04L5/00
CPCH04B7/0456H04L5/0048
Inventor 易辉跃
Owner SHANGHAI RES CENT FOR WIRELESS COMM