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Method, base station and system for balancing load

A load and balancing technology, applied in the field of communication, can solve the problems that the cell cannot be used as load balancing, cannot continue to be used, and bandwidth is related.

Active Publication Date: 2017-02-15
CHINA TELECOM CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Problem 1: The calculation method of the available capacity of the target cell needs to be adjusted: firstly, there is a lack of configuration information related to "flexible duplex" between adjacent cells, and secondly, the current protocol believes that the capacity difference of LTE / LTE-A cells is only related to bandwidth
Therefore, after the introduction of "flexible duplex" technology, some subframes of uplink frequency points can be used for downlink. Since the number of available PRBs in the uplink and downlink directions has changed, the assumptions in the previous standard cannot be continued.
[0011] Problem 2: The protocol does not support the statistics of the resources of downlink subframes in the uplink frequency band and report the measurement results to neighboring base stations
[0012] Problem 3: Neighboring cells cannot negotiate on the configuration of downlink subframes in the uplink frequency band
The current specification can only negotiate mobility parameters, but a situation often occurs in the actual load balancing process: due to the heavy downlink load of the cell but the light uplink load, such a cell cannot be used as a load balancer target cell, resulting in waste of wireless resources and poor load balancing effect

Method used

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  • Method, base station and system for balancing load
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  • Method, base station and system for balancing load

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Embodiment 1

[0273] This embodiment mainly provides a process of performing a load balancing operation in a heterogeneous network. Among them, the macro base station and the Pico base station (small base station) are the base stations of FDD. In addition, the Pico base station supports flexible duplex configuration, and the macro base station does not support flexible duplex configuration, but supports measurement for flexible duplex terminals. An X2 interface can be established between the macro base station and the Pico base station. The Pico base station does not configure any downlink subframes in the uplink frequency band before the load balancing operation. After the load balancing operation, a downlink subframe is configured every 5 ms in the uplink frequency band. The corresponding subframe structure is as Figure 13 As shown in the figure, the networking scenario in the heterogeneous network is as follows Figure 14 shown.

[0274] Step 1: The Pico base station initiates the ...

Embodiment 2

[0305]This embodiment mainly provides a process of load balancing operation in the same coverage scenario. The topology structure is as follows: Figure 15 shown. The base stations to which the cell 1 and the cell 2 belong are both FDD base stations. And both are configured with flexible duplex configuration. An X2 interface can be established between two cells. Cell 2 does not configure any downlink subframes in the uplink frequency band before the load balancing operation. After the load balancing operation, a downlink subframe is configured every 5 ms in the uplink frequency band.

[0306] Step 1: Cell 2 initiates the "Cell Configuration Update" process on the X2 interface to Cell 1. This process is used to notify neighboring cells of changes in the local area information. Since Cell 2 supports the flexible duplex function, the following information is carried in the message:

[0307] 1) Uplink and downlink bandwidth currently configured in this cell: 20MHz

[0308] 2)...

Embodiment 3

[0333] This embodiment mainly provides a process of performing load balancing failure operation in the same coverage scenario. The topology structure is as follows: Figure 15 shown. The base stations to which the cell 1 and the cell 2 belong are both FDD base stations. And both are configured with flexible duplex configuration. An X2 interface can be established between two cells. Cell 2 does not configure any downlink subframes in the uplink frequency band before the load balancing operation. After the load balancing operation, a downlink subframe is configured every 5 ms in the uplink frequency band.

[0334] Step 1: Cell 2 initiates the "Cell Configuration Update" process on the X2 interface to Cell 1. This process is used to notify neighboring cells of changes in the local area information. Since Cell 2 supports the flexible duplex function, the following information is carried in the message:

[0335] 1) Uplink and downlink bandwidth currently configured in this cell...

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Abstract

The invention discloses a method, base station and system for balancing load. The method comprises steps that a source base station sends a load measurement request to candidate base stations supporting flexible duplex configuration when incapable of achieving load balance so that the candidate base stations report current uplink load and current downlink load; the source base station selects a candidate base station satisfying a condition as a target base station according to the uplink load and the downlink load reported by the candidate base stations; the source base station selects a target terminal in a current cell, and determines the uplink sub frame configuration information of the uplink frequency band of the target base station according to the loading service of the target terminal; the source base station sends a parameter negotiation request to the target base station for evaluation, and the source base station triggers an event for transferring the load of the target terminal to the target base station if the target base station accepts the uplink sub frame configuration information. In the invention, the load of the target terminal is transferred to the appropriate target base station so that the resources of the base stations can be effectively utilized and load balance can be achieved between the base stations.

Description

technical field [0001] The present invention relates to the communication field, in particular to a load balancing method, base station and system. Background technique [0002] The uplink and downlink rates of services in the network are usually asymmetrical. According to statistics, the uplink and downlink rate ratio of most Internet services is between 1 / 3 and 1 / 9, and in wired networks such as ADSL (Asymmetric Digital Subscriber Line, Asymmetric Digital Subscriber Line) technologies, uplink and downlink also use Different bandwidths are used to provide services to users. For wireless networks, especially FDD (Frequency Division Duplexing, Frequency Division Duplexing) technology, a set of symmetrical spectrum resources is required, and the uplink and downlink bandwidths usually use the same size. , often resulting in the uplink spectrum resources often not being fully utilized. [0003] The goals of future wireless networks include effectively utilizing existing frequ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W28/08H04W36/08H04W28/18
CPCH04W28/08H04W28/18H04W36/08
Inventor 许森孙震强张光辉
Owner CHINA TELECOM CORP LTD