CN102625368A - Switch method and device for cells in heterogeneous network - Google Patents
Switch method and device for cells in heterogeneous network Download PDFInfo
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- H04W28/08—Load balancing or load distribution
- H04W28/086—Load balancing or load distribution among access entities
- H04W28/0861—Load balancing or load distribution among access entities between base stations
- H04W28/0864—Load balancing or load distribution among access entities between base stations of different hierarchy levels, e.g. Master Evolved Node B [MeNB] or Secondary Evolved node B [SeNB]
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Abstract
The invention discloses a switch method for cells in a heterogeneous network. The method comprises the following steps that: a base station sets and executes a cell identification (ID) conflict strategy; the base station determines a load rate selection interval with balanced load by using a heterogeneous network node load rate comparator; the base station determines that the cell ID conflict exists in the heterogeneous network by using a cell ID conflict selector, and executes the cell ID conflict strategy; the base station determines a preferred group of network nodes serving user equipment (UE) according to a threshold value of a signal to interference noise ratio (SINR); and a switch activation and validation device of the base station performs cell switch on the UE according to cell information fed back by the UE, the preferred group and the load rate selection interval. The invention also discloses a switch device for the cells in the heterogeneous network. By the scheme provided by the invention, a cell ID conflict can be avoided; network load balance is improved; and system overhead brought by cell switch is reduced.
Description
Technical Field
The present invention relates to heterogeneous network communication technologies, and in particular, to a method and an apparatus for handover of a cell in a heterogeneous network.
Background
In the next generation broadband wireless communication network, solving how to support a larger bandwidth in the wireless communication network under the bandwidth in the current wireless communication system becomes a key factor for improving the throughput of the user terminals between cells and the average throughput of the user terminals and faces a serious challenge.
Currently, in Long Term Evolution (LTE) of the third generation partnership project, it is proposed to form a heterogeneous network by introducing low power nodes such as a home base station, a relay station, and a Femto cell into a macro cell to expand network coverage and improve load carrying capability, where all the low power nodes have independent load capabilities, that is, when a User Equipment (UE) can be accessed and a heterogeneous network is formed in the macro cell, there are many problems, such as:
when a low-power node in a heterogeneous network moves through or enters a macro cell coverage area and tries to access a base station, the problem of cell Identification (ID) collision between the base station and the base station of the low-power node or between the low-power nodes is caused;
the load imbalance problem between a base station and a low-power node in the heterogeneous network caused by UE selection and an access strategy in the heterogeneous network;
the coverage problem of a Physical Downlink Control CHannel (PDCCH) in the selection of a serving cell based on path loss in a heterogeneous network, and the system overhead problem caused by excessive exchange of information such as transmission power and the like;
the small coverage area of the local node and the mobility of the UE in the heterogeneous network will cause problems with frequent handovers between the local cell and the macro cell.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a method and an apparatus for cell handover in a heterogeneous network, which avoid cell ID collision, improve network load balancing, and reduce system overhead caused by cell handover.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the invention provides a method for switching cells in a heterogeneous network, which comprises the following steps:
the base station sets and executes a cell ID conflict strategy;
the base station determines a load rate selection interval with balanced load through a heterogeneous network node load rate comparator;
when the base station determines that the cell ID conflicts exist in the heterogeneous network through the cell ID conflict selector, a cell ID conflict strategy is executed;
the base station determines a preferred group of the network node serving the UE according to a Signal to Interference plus Noise Ratio (SINR) threshold;
and the switching activation and confirmation device of the base station selects an interval to carry out cell switching on the UE according to the preferred grouping and the load rate according to the cell information fed back by the UE.
In the above scheme, the cell ID collision policy is: for the base stations, time offset or phase shift, or active or passive route selection and switching mode is adopted;
for the base station and the low power node, a cell ID transparent processing and master-slave base station routing and switching mode are adopted;
for the low power nodes, the transparency processing of the cell ID, time offset or phase shift, or master-slave base station routing and switching mode are adopted.
In the above scheme, the base station determines, by using the heterogeneous network node load rate comparator, that the load rate selection interval for load balancing is:
the base station sets a heterogeneous network node load rate comparator and a load rate comparison threshold, the heterogeneous network node load rate comparator determines the load rates of different network nodes and the load rates of corresponding network systems, and a load rate selection interval with balanced load is determined according to the load rate comparison threshold.
In the above solution, the handover activation and confirmation device of the base station performs cell handover on the UE according to the cell information fed back by the UE and the preferred grouping and load rate selection interval, where the cell handover activation and confirmation device includes:
a switching activation and affirming device of the base station selects a cell ID of a network node in a load rate selection interval from a preferred group of the UE through a cell ID conflict selector when the switching activation condition is determined to be met according to cell information fed back by the UE; and sending a selection and switching request to the UE according to the cell ID of the selected network node.
In the foregoing solution, the handover activation condition includes: SINR versus SINR activation of SINR measured by the UE with SINR threshold, load ratio versus activation, UE performance versus activation, and active/passive handover activation.
In the above scheme, the network node includes a base station and a low power node in a heterogeneous network.
The invention provides a switching device of cells in a heterogeneous network, which comprises: the system comprises a cell ID collision selector, a heterogeneous network node load rate comparator, a preferred grouping unit and a switching activation and confirmation device; wherein,
a cell ID conflict selector for setting and executing cell ID conflict strategy; when determining that the cell ID conflicts exist in the heterogeneous network, executing a cell ID conflict strategy;
the heterogeneous network node load rate comparator is used for determining a load rate selection interval of load balancing;
a preferred grouping unit, configured to determine a preferred grouping of the network node serving the UE according to the SINR threshold;
and the switching activation and confirmation device is used for carrying out cell switching on the UE according to the preferred grouping and the load rate selection interval according to the cell information fed back by the UE.
In the above scheme, the heterogeneous network node load rate comparator is specifically configured to set a load rate comparison threshold; and determining the load rates of different network nodes and the load rates of corresponding network systems, and determining a load rate selection interval of load balance according to the load rates and a threshold value.
In the above scheme, the handover activation and confirmation device is specifically configured to select, when it is determined that a handover activation condition is satisfied according to cell information fed back by the UE, a cell ID of a network node in a load rate selection interval from a preferred group of the UE through a cell ID collision selector; and sending a selection and switching request to the UE according to the cell ID of the selected network node.
The invention provides a method and a device for switching cells in a heterogeneous network.A base station sets an execution cell ID conflict strategy; the base station determines a load rate selection interval with balanced load through a heterogeneous network node load rate comparator; when the cell ID conflict selector determines that the cell ID conflicts exist in the heterogeneous network, a cell ID conflict strategy is executed; the base station determines a preferred grouping of the network node serving the UE according to the SINR threshold value; the switching activation and affirming device of the base station selects an interval to switch the UE cell according to the preferred grouping and the load rate according to the cell information fed back by the UE; therefore, cell ID collision can be avoided, network load balance is improved, cell switching initiated by UE is determined through the base station, and system overhead caused by frequent cell switching can be reduced.
Drawings
Fig. 1 is a schematic flowchart illustrating a method for implementing handover of a cell in a heterogeneous network according to the present invention;
fig. 2 is a schematic structural diagram of a device for implementing handover of a cell in a heterogeneous network according to the present invention.
Detailed Description
The basic idea of the invention is: the base station sets and executes a cell ID conflict strategy; the base station determines a load rate selection interval with balanced load through a heterogeneous network node load rate comparator; when the cell ID conflict selector determines that the cell ID conflicts exist in the heterogeneous network, a cell ID conflict strategy is executed; the base station determines a preferred grouping of the network node serving the UE according to the SINR threshold value; and the switching activation and confirmation device of the base station selects an interval to carry out cell switching on the UE according to the preferred grouping and the load rate according to the cell information fed back by the UE.
The invention is further described in detail below with reference to the figures and the specific embodiments.
The invention realizes a method for switching cells in a heterogeneous network, which comprises the following steps as shown in figure 1:
step 101: the base station sets a cell ID conflict selector and sets a cell ID conflict strategy when the cell IDs conflict;
the cell ID collision policy is: for the base stations, time offset or phase shift, or active or passive route selection and switching mode is adopted; for the base station and the low power node, a cell ID transparent processing and master-slave base station routing and switching mode are adopted; for low power nodes, a transparency process of a cell ID, a time offset or a phase shift, or a master-slave base station routing and switching mode and the like are adopted.
Step 102: the base station determines a load rate selection interval with balanced load through a heterogeneous network node load rate comparator;
specifically, a base station sets a heterogeneous network node load rate comparator and a load rate comparison threshold, the heterogeneous network node load rate comparator determines the load rates of different network nodes and the load rates of corresponding network systems, and a load rate selection interval with balanced load is determined according to the load rate comparison threshold;
the network nodes comprise base stations and low-power nodes in a heterogeneous network;
the determining of the load rates of different network nodes and the load rates of corresponding network systems is as follows: full load and current load of base station respectively use OLMO、OLMCIndicating that full load and current load of each low power node are respectively OLLO、OLLCIndicating that the load rates of the base station and the low power node are POLM、POLLIs represented by POLM、POLLThe calculation formulas of (A) and (B) are respectively as follows:
POLM＝OLMC/OLMO
POLL＝OLLC/OLLO
negative of network systemLoading rate POLThe calculation formula of (2) is as follows:
POL＝POLL/POLM＝(OLLC×OLMO)/(OLLO×OLMC)
the load rate selection interval for determining load balance according to the load rate comparison threshold is as follows: selecting a load rate P of the network system that is within a load rate comparison thresholdOLAccording to the selected load rate P of the network systemOLAnd determining a load rate interval with balanced load, wherein all network nodes in the heterogeneous network are considered to be balanced in load in the load rate interval, and load balancing adjustment is not needed.
Step 103: the base station sets a switching activation and confirmation device, sets a switching activation condition and a confirmed application strategy, and issues the set switching activation condition and the confirmed application strategy to the UE;
the handover activation condition includes: SINR contrast value activation, load ratio contrast value activation, UE performance contrast value activation, active/passive switching activation and the like of SINR measured by the UE and an SINR threshold value;
the confirmed application policy may be an active handover or a passive handover.
Step 104: the base station receives information fed back by the low-power node, and executes a cell ID conflict strategy when the cell ID conflict selector determines that the heterogeneous network has cell ID conflicts;
the information fed back by the low-power node comprises maximum transmitting power, load rate and the like;
the method also comprises the following steps: the base station determines a coverage area according to the maximum transmitting power and the maximum transmitting power fed back by the low-power node;
step 105: the base station determines a preferred grouping of the network node serving the UE according to the SINR threshold value;
specifically, the base station sets SINR thresholds of different network nodes in the heterogeneous network, receives cell information fed back by the UE, compares SINR in the cell information with SINR thresholds of corresponding network nodes, and adds cell IDs of the network nodes of which SINR accords with the SINR thresholds into a preferred group;
the cell information includes: inter-cell interference, SINR, load rate of each network node serving the UE, and UE performance parameters; the performance parameters are as follows: throughput, peak rate, etc.
Step 106: the switching activation and affirming device of the base station selects an interval to switch the UE cell according to the preferred grouping and the load rate according to the cell information fed back by the UE;
specifically, when determining that the handover activation condition is satisfied according to the SINR fed back by the UE, the load ratios of the network nodes serving the UE, the UE performance parameters, and other cell information, the handover activation and confirmation device of the base station performs active handover according to the preferred grouping and load ratio selection interval, that is: a switching activation and affirming device of the base station selects the cell ID of the network node in the load rate selection interval from the preferred group of the UE through a cell ID conflict selector; sending a selection and switching request to the UE according to the cell ID of the selected network node; and after receiving the selection and switching request, the UE completes cell selection and switching according to the selection and switching process.
The method further comprises the following steps: the method comprises the steps that when UE determines that a switching activation condition is met according to measured cell information, a passive switching request is sent to a base station, wherein the passive switching request carries measured SINR, load rate of each network node serving the UE, UE performance parameters and other cell information, and when a switching activation and confirmation device of the base station determines that the switching activation condition is met according to cell information fed back by the UE, a cell ID conflict selector selects a cell ID of a network node in a load rate selection interval from a preferred group of the UE; sending a selection and switching request to the UE according to the cell ID of the selected network node; and after receiving the selection and switching request, the UE completes cell selection and switching according to the selection and switching process.
In order to implement the foregoing method, the present invention further provides a device for handover of a cell in a heterogeneous network, as shown in fig. 2, the device includes: a cell ID collision selector 21, a heterogeneous network node load ratio comparator 22, a preferred grouping unit 23 and a switching activation and confirmation device 24; wherein,
a cell ID collision selector 21 for setting a policy for performing cell ID collision; when determining that the cell ID conflicts exist in the heterogeneous network, executing a cell ID conflict strategy;
the heterogeneous network node load rate comparator 22 is configured to determine a load rate selection interval for load balancing;
a preferred grouping unit 23, configured to determine a preferred grouping of the network node serving the UE according to the SINR threshold;
a handover activation and confirmation device 24, configured to perform cell handover on the UE according to the cell information fed back by the UE and according to the preferred grouping and load rate selection interval;
the heterogeneous network node load rate comparator 22 is specifically configured to set a load rate comparison threshold; determining the load rates of different network nodes and the load rates of corresponding network systems, and determining a load rate selection interval of load balancing according to the load rates and a threshold value;
the handover activation and confirmation device 24 is specifically configured to select, when it is determined that a handover activation condition is satisfied according to cell information such as SINR fed back by the UE, load ratios of network nodes serving the UE, and UE performance parameters, a cell ID of a network node in a load ratio selection interval from a preferred group of the UE through a cell ID collision selector; sending a selection and switching request to the UE according to the cell ID of the selected network node;
the handover activation condition includes: SINR versus SINR activation of SINR measured by the UE with SINR threshold, load ratio versus activation, UE performance versus activation, and active/passive handover activation, etc.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (10)
1. A method for handover of a cell in a heterogeneous network, the method comprising:
the base station sets a conflict strategy for executing cell Identification (ID);
the base station determines a load rate selection interval with balanced load through a heterogeneous network node load rate comparator;
when the base station determines that the cell ID conflicts exist in the heterogeneous network through the cell ID conflict selector, a cell ID conflict strategy is executed;
a base station determines a preferred grouping of network nodes serving a User Equipment (UE) according to a signal to interference noise ratio (SINR) threshold;
and the switching activation and confirmation device of the base station selects an interval to carry out cell switching on the UE according to the preferred grouping and the load rate according to the cell information fed back by the UE.
2. The handover method of claim 1, wherein the cell ID collision policy is: for the base stations, time offset or phase shift, or active or passive route selection and switching mode is adopted;
for the base station and the low power node, a cell ID transparent processing and master-slave base station routing and switching mode are adopted;
for the low power nodes, the transparency processing of the cell ID, time offset or phase shift, or master-slave base station routing and switching mode are adopted.
3. The handover method according to claim 2, wherein the base station determines the load rate selection interval for load balancing through the heterogeneous network node load rate comparator as follows:
the base station sets a heterogeneous network node load rate comparator and a load rate comparison threshold, the heterogeneous network node load rate comparator determines the load rates of different network nodes and the load rates of corresponding network systems, and a load rate selection interval with balanced load is determined according to the load rate comparison threshold.
4. The handover method according to claim 1, wherein the handover activator and confirmer of the base station performs cell handover to the UE according to the preferred grouping and load rate selection interval according to the cell information fed back by the UE, and comprises:
a switching activation and affirming device of the base station selects a cell ID of a network node in a load rate selection interval from a preferred group of the UE through a cell ID conflict selector when the switching activation condition is determined to be met according to cell information fed back by the UE; and sending a selection and switching request to the UE according to the cell ID of the selected network node.
5. The handover method according to claim 4, wherein the handover activation condition comprises: SINR versus SINR activation of SINR measured by the UE with SINR threshold, load ratio versus activation, UE performance versus activation, and active/passive handover activation.
6. The handover method according to any of claims 1 to 5, wherein the network nodes comprise base stations and low power nodes in a heterogeneous network.
7. An apparatus for handover of a cell in a heterogeneous network, the apparatus comprising: the system comprises a cell ID collision selector, a heterogeneous network node load rate comparator, a preferred grouping unit and a switching activation and confirmation device; wherein,
a cell ID conflict selector for setting and executing cell ID conflict strategy; when determining that the cell ID conflicts exist in the heterogeneous network, executing a cell ID conflict strategy;
the heterogeneous network node load rate comparator is used for determining a load rate selection interval of load balancing;
a preferred grouping unit, configured to determine a preferred grouping of the network node serving the UE according to the SINR threshold;
and the switching activation and confirmation device is used for carrying out cell switching on the UE according to the preferred grouping and the load rate selection interval according to the cell information fed back by the UE.
8. The handover apparatus according to claim 7, wherein the heterogeneous network node load rate comparator is specifically configured to set a load rate comparison threshold; and determining the load rates of different network nodes and the load rates of corresponding network systems, and determining a load rate selection interval of load balance according to the load rates and a threshold value.
9. The handover apparatus according to claim 7, wherein the handover activation and confirmation device is specifically configured to select, when it is determined that the handover activation condition is satisfied according to the cell information fed back by the UE, the cell ID of the network node in the load rate selection interval from the preferred group of the UE through the cell ID collision selector; and sending a selection and switching request to the UE according to the cell ID of the selected network node.
10. The switching device according to claim 9, wherein the switching activation condition comprises: SINR versus SINR activation of SINR measured by the UE with SINR threshold, load ratio versus activation, UE performance versus activation, and active/passive handover activation.
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| CN2012100653333A CN102625368A (en) | 2012-03-13 | 2012-03-13 | Switch method and device for cells in heterogeneous network |
| PCT/CN2012/076985 WO2013135014A1 (en) | 2012-03-13 | 2012-06-15 | Switch method and device for cells in heterogeneous network |
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| CN106134256A (en) * | 2014-04-09 | 2016-11-16 | Lg 电子株式会社 | The method and apparatus controlling switching in the environment supporting mobile cell |
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| CN109587761A (en) * | 2017-09-29 | 2019-04-05 | 维布络有限公司 | The method and system of data path switching is carried out in heterogeneous wireless communication networks |
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| WO2013135014A1 (en) | 2013-09-19 |
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Application publication date: 20120801 |