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A method and system for downlink multi-base station multi-input multi-output precoding coordination

A multiple-input, multiple-output, precoding technology, applied in the field of communication, can solve problems such as network performance degradation and inability to reduce interference

Active Publication Date: 2017-03-15
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, interference randomization cannot reduce interference, and interference cancellation between cells can only eliminate main interference
[0006] Therefore, it is necessary to propose a new precoding coordination method to solve the above-mentioned problem of degradation of the entire network performance caused by interference between adjacent cells, especially cell edge users.

Method used

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  • A method and system for downlink multi-base station multi-input multi-output precoding coordination
  • A method and system for downlink multi-base station multi-input multi-output precoding coordination
  • A method and system for downlink multi-base station multi-input multi-output precoding coordination

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Embodiment 1: It is used to illustrate the situation that the PMI coordination of two adjacent cells succeeds.

[0070] Please refer to figure 1 and Figure 4 . In this embodiment, two adjacent cells are taken as an example to illustrate the situation that the PMI coordination of the base stations in the downlink communication is successful, and the precoding matrix is ​​calculated based on the obtained PMI.

[0071] After base station BS1 and BS2 exchange information, BS1 compares PMI1 and PMI1', and obtains that MS1's feedback PMI1 is in MS2's recommendation set PMI1' for BS1, and then calculates the precoding matrix of MS1:

[0072] The calculation of the precoding matrix of MS1 can adopt method a, that is, the precoding matrix W of PMI1 can be obtained directly by looking up the table PMI , where W PMI Indicates the codeword of rank=1 obtained through the PMI table lookup.

[0073] The calculation of the precoding matrix of MS1 can also adopt the method b, calc...

Embodiment 2

[0078] Embodiment 2: It is used to explain that when two adjacent cells have PMI conflicts, mode 1 is used for coordination.

[0079] Please refer to figure 1 and Figure 5 . In this embodiment, two adjacent cells are taken as an example to describe the process in which PMIs of base stations collide in downlink communication, and mode 1 is adopted, that is, users with low priority select other PMIs for transmission.

[0080]After base station BS1 and BS2 exchange information, BS1 compares PMI1 and PMI1', and obtains that MS1's feedback PMI1 is not in MS2's recommendation set PMI1' for BS1, that is, MS1's feedback PMI1 conflicts with MS2's recommendation information PMI1' for BS1 , the base station exchanges the QoS-related information of the scheduled user through high-layer signaling to obtain the priority information of the current user.

[0081] If the current user has the highest priority level, the precoding matrix calculation is performed directly.

[0082] The calcu...

Embodiment 3

[0089] Embodiment 3: It is used to illustrate the use of mode 2 coordination when two adjacent cells have PMI conflicts

[0090] Please refer to figure 1 and Image 6 . In this embodiment, two adjacent cells are taken as an example to illustrate the process of base station PMI conflicts in downlink communication, and mode 2 is adopted, that is, a process in which users with low priority reallocate resources to coordinate precoding.

[0091] After base station BS1 and BS2 exchange information, BS1 compares PMI1 and PMI1', and obtains that MS1's feedback PMI1 is not in MS2's recommendation set PMI1' for BS1, that is, MS1's feedback PMI1 conflicts with MS2's recommendation information PMI1' for BS1 , the base station exchanges the QoS-related information of the scheduled user through high-layer signaling to obtain the priority information of the current user.

[0092] If the current user has the highest priority level, the precoding matrix calculation is performed directly.

...

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Abstract

The invention provides a method for precoding coordination of downlink multi-base station multi-input and multi-output, which comprises the following steps of: 1. each user measures channel information of a service base station and adjacent base stations, acquires resource scheduling information, feeds the resource scheduling information back to the service base station; 2. the service base station carries out resource block predistribution according to the resource scheduling information; 3. the resource scheduling information is interacted between the adjacent base stations to obtain PMI (Precoding Matrix Indication) information interacting result; and 4. the service base station completes the precoding coordination of each resource block according to the PMI information interacting result. The invention also provides a system for precoding coordination of downlink multi-base station multi-input and multi-output. Through the method and the system of the invention, the interference to the edge user is reduced among the adjacent cells through downlink resource allocation and precoding coordination, so that the performance of the whole network is improved.

Description

technical field [0001] The invention relates to the communication field, in particular to a method and system for downlink multi-base station multi-input multi-output precoding coordination. Background technique [0002] MIMO (Multiple-In Multiple-Out) technology is a major breakthrough in smart antenna technology in the field of wireless mobile communications. With the continuous research and improvement of this technology, it has become the key technology of the new generation mobile communication system. The MIMO system adopts multi-antenna units at both the sending end and the receiving end, uses advanced antenna transmission and signal processing technology, utilizes multi-path propagation of wireless channels, takes advantage of the situation, develops space resources, and establishes space parallel transmission channels without increasing bandwidth and transmission. In the case of power, the quality and data rate of wireless communication can be improved exponentiall...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/06H04L1/00H04W72/12
Inventor 焦晓晓朱登魁宁迪浩
Owner ZTE CORP