CN103945457A - Method and equipment for load balancing of heterogeneous network composed of cellular network and wireless local area network - Google Patents

Method and equipment for load balancing of heterogeneous network composed of cellular network and wireless local area network Download PDF

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Publication number
CN103945457A
CN103945457A CN201310020474.8A CN201310020474A CN103945457A CN 103945457 A CN103945457 A CN 103945457A CN 201310020474 A CN201310020474 A CN 201310020474A CN 103945457 A CN103945457 A CN 103945457A
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China
Prior art keywords
local area
wireless local
area network
wlan
load
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CN201310020474.8A
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Chinese (zh)
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CN103945457B (en
Inventor
韩锋
尼古拉·帕丹
张凯宾
刘铮
孟艳
郑武
钱德瑞卡·沃拉尔
林晓翔
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Nokia Shanghai Bell Co Ltd
Alcatel Optical Networks Israel Ltd
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Alcatel Lucent Shanghai Bell Co Ltd
Alcatel Optical Networks Israel Ltd
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Application filed by Alcatel Lucent Shanghai Bell Co Ltd, Alcatel Optical Networks Israel Ltd filed Critical Alcatel Lucent Shanghai Bell Co Ltd
Priority to CN201310020474.8A priority Critical patent/CN103945457B/en
Priority to PCT/IB2014/000118 priority patent/WO2014111808A2/en
Publication of CN103945457A publication Critical patent/CN103945457A/en
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Publication of CN103945457B publication Critical patent/CN103945457B/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • 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
    • H04W28/0865—Load balancing or load distribution among access entities between base stations of different Radio Access Technologies [RATs], e.g. LTE or WiFi
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/22—Performing reselection for specific purposes for handling the traffic

Abstract

The invention aims to provide a method and equipment for realizing load balancing of a heterogeneous network composed of a cellular network and a wireless local area network. The method involves acquiring load information of a neighboring wireless local area network by cellular network access equipment, wherein the heterogeneous network is composed of the cellular network and the wireless local area network; according to the load information of the wireless local area network, determining the load condition of the wireless local area network; and according to the load condition of the wireless local area network, configuring user equipment corresponding to the wireless local area network to perform switching or routing, thereby achieving load balancing of the heterogeneous network. Compared with the prior art, the self-optimizing method for realizing load balancing of the heterogeneous network composed of the cellular network and the wireless local area network overcomes the problem of load unbalancing of the cellular network and the neighboring wireless local area network, does not need intervention of maintainers, provides relatively good user experience, controls and manages the wireless local area network based on the cellular network, and realizes self-optimization of the load balancing of the heterogeneous network.

Description

The method and apparatus of load balancing under the heterogeneous network of Cellular Networks and WLAN (wireless local area network)
Technical field
The present invention relates to communication technical field, relate in particular to a kind of for realizing Cellular Networks (Cellular Network, CN) technology of load balancing and under the heterogeneous network of WLAN (wireless local area network) (Wireless Local Area Networks, WLAN).
Background technology
WLAN (wireless local area network), due to wider usable spectrum and dispose widely, has become carrier network and has carried out the effective ways of load bridging.3GPP (The 3rd GenerationPartnership Project, third generation partner program) is integrated in core net aspect of Standardized wireless local area network (LAN) and Cellular Networks.But in the aspect of eating dishes without rice or wine, Cellular Networks and WLAN (wireless local area network) still work alone.And always by subscriber equipment, switching or the route between Cellular Networks and WLAN (wireless local area network) initiated in the decision based on self.
Due to the passing of time and the movement of subscriber equipment, different WLAN (wireless local area network) often has different load conditions.But, because Cellular Networks and WLAN (wireless local area network) are in the independence of the aspect of eating dishes without rice or wine, aspect load balancing, there are a lot of inferior positions.Typically:
1) utilance of WLAN (wireless local area network) is too low.Owing to being that subscriber equipment self initiates to switch or route, in the time that Cellular Networks flow overloads, Cellular Networks can not effectively unload data traffic.
2) some WLAN (wireless local area network) are in heavy duty state other are in light-load state.But Cellular Networks is not known this situation, be applicable to unloaded cell network data flow thereby can not identify which WLAN (wireless local area network).
Do not have at present effective method to solve the problems referred to above.Simple method is OAM (an Operation Administration and Maintenance, the operation management is safeguarded) system that relies on operator, based on the load condition of Cellular Networks and WLAN (wireless local area network), manages and controls.But this kind of method needs centralized planning, and need artificial interference and supervision.
Summary of the invention
The object of this invention is to provide a kind of for realize load balancing under the heterogeneous network of Cellular Networks and WLAN (wireless local area network) method and apparatus.
According to an aspect of the present invention, provide a kind of for realizing the method for load balancing under the heterogeneous network of Cellular Networks and WLAN (wireless local area network), wherein, the method comprises the following steps:
A Cellular Networks access device obtains the load information of adjacent WLAN (wireless local area network), and wherein, described Cellular Networks and described WLAN (wireless local area network) form heterogeneous network;
B, according to the load information of described WLAN (wireless local area network), determines the load condition of described WLAN (wireless local area network);
C, according to the load condition of described WLAN (wireless local area network), configures the corresponding subscriber equipment of described WLAN (wireless local area network) and carries out switching/route, to realize the load balancing under described heterogeneous network.
According to a further aspect in the invention, also provide a kind of for realizing the Cellular Networks access device of load balancing under the heterogeneous network of Cellular Networks and WLAN (wireless local area network), this equipment comprises:
Acquisition device, for obtaining the load information of adjacent WLAN (wireless local area network), wherein, described Cellular Networks and described WLAN (wireless local area network) form heterogeneous network;
Determining device, for according to the load information of described WLAN (wireless local area network), determines the load condition of described WLAN (wireless local area network);
Adjusting device, for according to the load condition of described WLAN (wireless local area network), configures the corresponding subscriber equipment of described WLAN (wireless local area network) and carries out switching/route, to realize the load balancing under described heterogeneous network.
Compared with prior art, the present invention proposes to realize under the heterogeneous network of a kind of Cellular Networks and WLAN (wireless local area network) the self-organization method of load balancing, object is to overcome the load imbalance of Cellular Networks and adjacent WLAN (wireless local area network), do not need attendant's artificial participation, having preferably user experiences, carry out control and management WLAN (wireless local area network) based on Cellular Networks, realized the self-optimizing of the load balance of heterogeneous network, improved the performance of heterogeneous system.
Brief description of the drawings
By reading the detailed description that non-limiting example is done of doing with reference to the following drawings, it is more obvious that other features, objects and advantages of the present invention will become:
Fig. 1 illustrate according to one aspect of the invention for realizing the method flow diagram of load balancing under the heterogeneous network of Cellular Networks and WLAN (wireless local area network);
Fig. 2 illustrate in accordance with a preferred embodiment of the present invention for realizing the system topological figure of load balancing under the heterogeneous network of Cellular Networks and WLAN (wireless local area network);
Fig. 3 illustrate according to another preferred embodiment of the present invention for realizing the method flow diagram of load balancing under the heterogeneous network of Cellular Networks and WLAN (wireless local area network);
Fig. 4 illustrate according to the present invention another preferred embodiment for realizing the method flow diagram of load balancing under the heterogeneous network of Cellular Networks and WLAN (wireless local area network);
Fig. 5 illustrate according to a further aspect of the present invention for realizing the equipment schematic diagram of load balancing under the heterogeneous network of Cellular Networks and WLAN (wireless local area network).
In accompanying drawing, same or analogous Reference numeral represents same or analogous parts.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Fig. 1 illustrate according to one aspect of the invention for realizing the method flow diagram of load balancing under the heterogeneous network of Cellular Networks and WLAN (wireless local area network).
In step S101, Cellular Networks access device obtains the load information of adjacent WLAN (wireless local area network), and wherein, described Cellular Networks and described WLAN (wireless local area network) form heterogeneous network.
At this, Cellular Networks access device includes but not limited to LTE (Long Term Evolution, Long Term Evolution) eNB (evolved Node B in system, evolved base station), WCDMA (Wideband Code Division Multiple Access, Wideband Code Division Multiple Access (WCDMA)) RNC (Radio Network Controller in system, radio network controller) or GSM (GlobalSystem of Mobile communication, global system for mobile communications) in BSC (BaseStation Controller, base station controller), it passes through OAM, or the measurement report that sends of its subscriber equipment of serving, determine adjacent with it WLAN (wireless local area network).At this, as shown in Figure 2, taking LTE system as example, this Cellular Networks and adjacent WLAN (wireless local area network) form heterogeneous network.
Particularly, the mode that Cellular Networks access device obtains the load information of adjacent WLAN (wireless local area network) includes but not limited to:
1) described Cellular Networks access device, sends load requests by the first predetermined interface to described WLAN (wireless local area network); Described WLAN (wireless local area network), according to described load requests, detects the load information of described WLAN (wireless local area network), and is sent to described Cellular Networks access device by described the first predetermined interface.
For example, when this Cellular Networks access device is the eNB in LTE system, this eNB is by the X3 interface between itself and adjacent WLAN (wireless local area network), send the load requests about this WLAN (wireless local area network) to this WLAN (wireless local area network), as the access point to this WLAN (wireless local area network) (Access Point, AP) sends load requests; This WLAN (wireless local area network), according to this load requests, detects the load information of described WLAN (wireless local area network), as according to the parameter of being asked in this load requests, the load of this parameter correlation is detected, and obtains load information, and is sent to this eNB by this X3 interface.
2) described Cellular Networks access device sends load requests to the network element of core net, and wherein, described core net is corresponding with described Cellular Networks and described WLAN (wireless local area network); Described network element, by the second predetermined interface, is forwarded to described WLAN (wireless local area network) by described load requests; Described WLAN (wireless local area network), according to described load requests, detects the load information of described WLAN (wireless local area network), and is sent to described network element by described the second predetermined interface; Described network element receives the load information of described WLAN (wireless local area network), and is forwarded to described Cellular Networks access device.
For example, when this Cellular Networks access device is the eNB in LTE system, this eNB sends load requests to MME (Mobility Management Entity, mobile management entity), as passed through S1 interface, send load requests to this MME, this MME again by and WLAN (wireless local area network) between Sx interface, this load requests is forwarded to this WLAN (wireless local area network), described WLAN (wireless local area network) is according to described load requests, detect the load information of described WLAN (wireless local area network), and be sent to this MME by this Sx interface; This MME receives the load information of this WLAN (wireless local area network), and is forwarded to this eNB.
And for example, when this Cellular Networks access device is the base station controller in radio network controller or the gsm system in WCDMA system, this access device sends load requests to SGSN, this SGSN (Serving GPRS Support Node, GPRS serving GPRS support node) again by and WLAN (wireless local area network) between Sy interface, this load requests is forwarded to this WLAN (wireless local area network), described WLAN (wireless local area network) is according to described load requests, detect the load information of described WLAN (wireless local area network), and be sent to this SGSN by this Sy interface; This SGSN receives the load information of this WLAN (wireless local area network), and is forwarded to this access device.
3) the corresponding historical subscriber equipment of described WLAN (wireless local area network) according to the linkage record of described WLAN (wireless local area network), and in conjunction with the timeliness threshold value of described linkage record, the load information of described WLAN (wireless local area network) included in described linkage record is sent to described Cellular Networks access device.
For example, suppose that a subscriber equipment is attached to a certain WLAN (wireless local area network) node before this, this subscriber equipment can be considered to the historical subscriber equipment of this WLAN (wireless local area network), this history subscriber device stores has the linkage record with this WLAN (wireless local area network), and this linkage record comprises the load information of this WLAN (wireless local area network).As in WLAN focus 2.0 specifications, allow access point to broadcast the subscriber equipment that its load information is corresponding.Subsequently, the load information in this linkage record is sent to this access device by the load requests that this history subscriber equipment can Cellular Networks access device, or this history subscriber equipment is initiatively sent to this access device by the load information in this linkage record.
At this, this access device and this history subscriber equipment also can be according to the identification informations of WLAN (wireless local area network), send load information corresponding to this WLAN (wireless local area network).For example, in the time of subscriber equipment access cellular network, report to the access device of this cellular network the WLAN (wireless local area network) that it connected before this, and provide the identification information of this WLAN (wireless local area network), this access device is according to this identification information, to the load information of this this WLAN (wireless local area network) of user equipment requests, as sent load requests to this subscriber equipment.At this, can be by adopting RRC (Radio Resource Control, radio resource control) dedicated signaling user equipment information requests/response messages to realize.
Preferably, this history subscriber equipment also can, in conjunction with the timeliness threshold value of this linkage record, initiatively maybe should be asked ground, and the load information in this linkage record is sent to this access device.For example, the timeliness threshold value of supposing this linkage record is 30 minutes,, this linkage record is only saved 30 minutes, after 30 minutes, lost efficacy, this history subscriber equipment is only sent to this Cellular Networks access device by meeting load information included in the linkage record of this timeliness threshold value,, only the included load information of linkage record being arranged within 30 minutes is sent to this Cellular Networks access device, to ensure the ageing of this load information.Or further, when the load information of not requested this WLAN (wireless local area network) of transmission of this history subscriber equipment, or its linkage record exceedes this timeliness threshold value, this history subscriber equipment is deleted processing to this linkage record or load information.
4) described Cellular Networks access device sends the load requests corresponding with described WLAN (wireless local area network) to multiple subscriber equipmenies; Described multiple subscriber equipment is measured the load information of described wireless local area networks broadcast, and the load information of the described WLAN (wireless local area network) measuring is sent to described Cellular Networks access device.Further, this access device gets after the load information that the plurality of subscriber equipment sends, and can determine the final load information of this WLAN (wireless local area network).
At this, this Cellular Networks access device also can send the load requests corresponding with this WLAN (wireless local area network) to multiple subscriber equipmenies, for example, this access device is by add the identification information of this WLAN (wireless local area network) in the specific fields of this load requests, and is sent to the plurality of subscriber equipment; The plurality of subscriber equipment is according to this load requests, from the specific fields of this request, extract this identification information, and based on this identification information, measure the load information of the corresponding WLAN (wireless local area network) of this identification information, and be sent to this access device, or, determine the linkage record with this WLAN (wireless local area network), or and then in conjunction with the timeliness threshold value of this linkage record, from this linkage record, the load information of this included WLAN (wireless local area network) is sent to this access device.Further, this connection device gets after the load information that the plurality of subscriber equipment sends, and can determine the final load information of this WLAN (wireless local area network).
Preferably, described Cellular Networks access device periodically or answer Event triggered and obtain the load information of adjacent WLAN (wireless local area network).At this, in the time that this Cellular Networks access device periodically obtains the load information of adjacent WLAN (wireless local area network), this access device should specify its adjacent WLAN (wireless local area network) to send the cycle of load information.In the time that this access device is answered Event triggered and obtained load information, this access device sends trigger condition to this adjacent WLAN (wireless local area network), if this adjacent WLAN (wireless local area network) meets this trigger condition, reports that corresponding load information is to this access device.
For example, to be periodically retrieved as example, the time interval of the access point of WLAN (wireless local area network) using specified cycle of access device as twice its load information of report.Be retrieved as example to answer Event triggered, Cellular Networks access device, in the specific fields of load requests, adds its granularity of wanting to receive load information (granularity).The access point of WLAN (wireless local area network) receives this load requests, with granularity included in this request, divide the load information of this WLAN (wireless local area network), to make it to be uniformly distributed into each rank, each load information when this WLAN (wireless local area network) from a change of rank to another grade, or the load information of this WLAN (wireless local area network) being when entering or exiting overload condition, this WLAN (wireless local area network) sends updating message to this access device, and this updating message comprises the up-to-date load information of this WLAN (wireless local area network).
At this, the load information of described WLAN (wireless local area network) comprises following at least any one:
The current wireless resource status of-described WLAN (wireless local area network);
The current hardware load of-described WLAN (wireless local area network);
The current backhaul load of-described WLAN (wireless local area network);
The load accepted of-described WLAN (wireless local area network).
This current Radio Resource state from scope 0 to 100%, show the present load situation of DL (Downlink, down link) and UL (Uplink, up link).Current hardware load represents with basic, normal, high and overload, shows the current hardware load of DL and UL.Current backhaul load represents with basic, normal, high and overload, shows the current backhaul load of DL and UL.Can accept load and show that DL and UL account for the percentage that total AP can ability to accept (know when total AP ability can the X3 interface between eNB and AP be set up, as, by WLAN version a/b/g/n).
In step S102, this Cellular Networks access device, according to the load information of described WLAN (wireless local area network), is determined the load condition of described WLAN (wireless local area network).Particularly, in step S102, this Cellular Networks access device is according to the load information of this WLAN (wireless local area network) of obtaining in step S101, as the current wireless resource status of this WLAN (wireless local area network), current hardware load, current backhaul load maybe can be accepted load etc., determine the load condition of this WLAN (wireless local area network), as whether this WLAN (wireless local area network) is in heavy duty state or whether this WLAN (wireless local area network) is in light-load state etc.
In step S103, this Cellular Networks access device, according to the load condition of described WLAN (wireless local area network), configures the corresponding subscriber equipment of described WLAN (wireless local area network) and carries out switching/route, to realize the load balancing under described heterogeneous network.Particularly, in step S103, this Cellular Networks access device is according to the load condition of determined this WLAN (wireless local area network) in step S102, configure the corresponding subscriber equipment of this WLAN (wireless local area network) and carry out switching/route, the WLAN (wireless local area network) or this Cellular Networks that are under light-load state as the subscriber equipment that is in the WLAN (wireless local area network) under heavy duty state is switched to, or the part carrying of the subscriber equipment that is in the WLAN (wireless local area network) under heavy duty state is routed to the WLAN (wireless local area network) or this Cellular Networks that are under light-load state, or reduce the WLAN (wireless local area network) even stoping to being in heavy duty situation and carry out switching/route, to realize the load balancing under this heterogeneous network.It should be noted at this, if this subscriber equipment is switched or part carrying routes to this and is in the WLAN (wireless local area network) under light-load state, within this subscriber equipment should be positioned at the coverage of this WLAN (wireless local area network).
In a preferred embodiment, this Cellular Networks access device is according to the load condition of this WLAN (wireless local area network), upgrade the reselection procedure/handover trigger parameter information for described WLAN (wireless local area network), as in the time that this WLAN (wireless local area network) is light-load state, turn down the condition switching on it, in the time that this WLAN (wireless local area network) is attached most importance to load condition, heighten condition switching on it etc., and the parameter information after this renewal is sent to the corresponding subscriber equipment of this WLAN (wireless local area network); Described subscriber equipment, according to the described reselection procedure/handover trigger parameter information after upgrading, generates the measurement report corresponding with described WLAN (wireless local area network), and is sent to described Cellular Networks access device; Described Cellular Networks access device is according to described measurement report, determine target UE, as determined, which target UE need to be from this WLAN (wireless local area network) switching/route out, or which target UE needs to switch/route to this WLAN (wireless local area network), and send switching/route instruction to described target UE; Described target UE is according to described switching/route instruction, with switch/routing operations of described WLAN (wireless local area network).
Taking LTE as example, Fig. 3 illustrates the handover procedure that eNB initiates.ENB sends switching command to subscriber equipment, switches determining between LTE and WLAN (wireless local area network).
1) eNB sends the access point of load requests to WLAN (wireless local area network);
2) this access point returns to load response to this eNB, and this load response comprises the load information of this WLAN;
3) eNB, according to this load information, sends and measures configuration messages to subscriber equipment;
4) this subscriber equipment, according to this measurement configuration messages, carries out parameter measurement, generates measurement report and returns to this measurement report to this eNB;
5) this eNB, based on this measurement report, makes and switching or route decision;
6) determine based on this switching or route, this eNB sends switching/route instruction to this subscriber equipment;
7) between subscriber equipment and WLAN (wireless local area network), access checking and attachment flow;
8) between this eNB and WLAN (wireless local area network), carry out packet data transmission.
Preferably, when the load condition of this WLAN (wireless local area network) is light-load state, the measurement report that this Cellular Networks access device sends according to subscriber equipment, determines the target UE that switches/route to described WLAN (wireless local area network), and sends switching/route instruction to described target UE; This target UE, according to this switching/route instruction, switches to this WLAN (wireless local area network), or part carrying is routed to this WLAN (wireless local area network).
When the load condition of this WLAN (wireless local area network) load condition of attaching most importance to, the measurement report that this Cellular Networks access device sends according to subscriber equipment, determine the target UE going out from described WLAN (wireless local area network) switching/route, and send switching/route instruction to described target UE; This target UE is according to this switching/route instruction, and this WLAN (wireless local area network) is switched out certainly, or part is carried from this WLAN (wireless local area network) route out.
At this, from this WLAN (wireless local area network) route, out this subscriber equipment some data flow is unloaded by this WLAN (wireless local area network) in part carrying.This unloaded data flow can be determined based on priority, QoS demand and/or service characteristic etc.The radio bearer that the RAN (Radio AccessNetwork, wireless access network) of 3GPP adheres to by release, initiates data flow unloading.
In one embodiment, 3GPP access device sends route messages to subscriber equipment, data are routed to this WLAN (wireless local area network).Meanwhile, radio bearer release message is sent to core network, and notifies the core net reason (as unloaded data by WLAN (wireless local area network)) that this radio bearer discharges.Subscriber equipment keeps two-way 3GPP and the WLAN (wireless local area network) of being connected to.The data that belong to d/d radio bearer communicate by WLAN (wireless local area network) and subscriber equipment.
As shown in Figure 4: 1) eNB sends and measures configuration messages to subscriber equipment;
2) subscriber equipment sends measurement report to eNB;
3) eNB sends RRC signaling from the decision of WLAN unloading data flow (only have partial data stream unloaded) to subscriber equipment, and asks WLAN (wireless local area network) to connect and set up;
4) eNB sends load shedding information to 3GPP Cellular Networks and non-3GPP Cellular Networks respectively;
5) between subscriber equipment and WLAN (wireless local area network), between WLAN (wireless local area network) and non-3GPP Cellular Networks, carry out data communication.
Preferably, this Cellular Networks access device can also be according to the switching/route instruction for target UE of its transmission, switch/route of target UE described in notice core network element.Core network element, according to this notice, is realized path between Cellular Networks and WLAN (wireless local area network) and is switched; For example, for switching, all data flow switch; For route, only partial data stream exchanges.
Fig. 5 illustrate according to a further aspect of the present invention for realizing the equipment schematic diagram of load balancing under the heterogeneous network of Cellular Networks and WLAN (wireless local area network).Cellular Networks access device comprises acquisition device 501, determining device 502 and adjusting device 503.
Acquisition device 501 obtains the load information of adjacent WLAN (wireless local area network), and wherein, described Cellular Networks and described WLAN (wireless local area network) form heterogeneous network.
At this, Cellular Networks access device includes but not limited to LTE (Long Term Evolution, Long Term Evolution) eNB (evolved Node B in system, evolved base station), WCDMA (Wideband Code Division Multiple Access, Wideband Code Division Multiple Access (WCDMA)) RNC (Radio Network Controller in system, radio network controller) or GSM (GlobalSystem of Mobile communication, global system for mobile communications) in BSC (BaseStation Controller, base station controller), it passes through OAM, or the measurement report that sends of its subscriber equipment of serving, determine adjacent with it WLAN (wireless local area network).At this, as shown in Figure 2, taking LTE system as example, this Cellular Networks and adjacent WLAN (wireless local area network) form heterogeneous network.
Particularly, the mode that the acquisition device 501 in Cellular Networks access device obtains the load information of adjacent WLAN (wireless local area network) includes but not limited to:
1) acquisition device 501 in described Cellular Networks access device, sends load requests by the first predetermined interface to described WLAN (wireless local area network); Described WLAN (wireless local area network), according to described load requests, detects the load information of described WLAN (wireless local area network), and is sent to described Cellular Networks access device by described the first predetermined interface.
For example, when this Cellular Networks access device is the eNB in LTE system, acquisition device in this eNB 501 is by the X3 interface between itself and adjacent WLAN (wireless local area network), send the load requests about this WLAN (wireless local area network) to this WLAN (wireless local area network), as the access point to this WLAN (wireless local area network) (Access Point, AP) sends load requests; This WLAN (wireless local area network) is according to this load requests, detect the load information of described WLAN (wireless local area network), as according to the parameter of being asked in this load requests, the load of this parameter correlation is detected, obtain load information, and be sent to the acquisition device 501 in this eNB by this X3 interface.
2) acquisition device 501 in described Cellular Networks access device sends load requests to the network element of core net, and wherein, described core net is corresponding with described Cellular Networks and described WLAN (wireless local area network); Described network element, by the second predetermined interface, is forwarded to described WLAN (wireless local area network) by described load requests; Described WLAN (wireless local area network), according to described load requests, detects the load information of described WLAN (wireless local area network), and is sent to described network element by described the second predetermined interface; Described network element receives the load information of described WLAN (wireless local area network), and is forwarded to the acquisition device 501 in described Cellular Networks access device.
For example, when this Cellular Networks access device is the eNB in LTE system, acquisition device 501 in this eNB is to MME (Mobility Management Entity, mobile management entity) transmission load requests, as passed through S1 interface, send load requests to this MME, this MME again by and WLAN (wireless local area network) between Sx interface, this load requests is forwarded to this WLAN (wireless local area network), described WLAN (wireless local area network) is according to described load requests, detect the load information of described WLAN (wireless local area network), and be sent to this MME by this Sx interface; This MME receives the load information of this WLAN (wireless local area network), and is forwarded to the acquisition device 501 in this eNB.
And for example, when this Cellular Networks access device is the base station controller in radio network controller or the gsm system in WCDMA system, acquisition device 501 in this access device sends load requests to SGSN, this SGSN (Serving GPRS Support Node, GPRS serving GPRS support node) again by and WLAN (wireless local area network) between Sy interface, this load requests is forwarded to this WLAN (wireless local area network), described WLAN (wireless local area network) is according to described load requests, detect the load information of described WLAN (wireless local area network), and be sent to this SGSN by this Sy interface; This SGSN receives the load information of this WLAN (wireless local area network), and is forwarded to the acquisition device 501 in this access device.
3) the corresponding historical subscriber equipment of described WLAN (wireless local area network) according to the linkage record of described WLAN (wireless local area network), and in conjunction with the timeliness threshold value of described linkage record, the load information of described WLAN (wireless local area network) included in described linkage record is sent to the acquisition device 501 in described Cellular Networks access device.
For example, suppose that a subscriber equipment is attached to a certain WLAN (wireless local area network) node before this, this subscriber equipment can be considered to the historical subscriber equipment of this WLAN (wireless local area network), this history subscriber device stores has the linkage record with this WLAN (wireless local area network), and this linkage record comprises the load information of this WLAN (wireless local area network).As in WLAN focus 2.0 specifications, allow access point to broadcast the subscriber equipment that its load information is corresponding.Subsequently, this history subscriber equipment can Cellular Networks access device load requests the load information in this linkage record is sent to the acquisition device 501 in this access device, or this history subscriber equipment is initiatively sent to the acquisition device 501 in this access device by the load information in this linkage record.
At this, also can be according to the identification information of WLAN (wireless local area network) with this history subscriber equipment in this access device, send load information corresponding to this WLAN (wireless local area network).For example, in the time of subscriber equipment access cellular network, report to the access device of this cellular network the WLAN (wireless local area network) that it connected before this, and provide the identification information of this WLAN (wireless local area network), this access device is according to this identification information, to the load information of this this WLAN (wireless local area network) of user equipment requests, as sent load requests to this subscriber equipment.At this, can be by adopting RRC (Radio Resource Control, radio resource control) dedicated signaling user equipment information requests/response messages to realize.
Preferably, this history subscriber equipment also can, in conjunction with the timeliness threshold value of this linkage record, initiatively maybe should be asked ground, and the load information in this linkage record is sent to this access device.For example, the timeliness threshold value of supposing this linkage record is 30 minutes,, this linkage record is only saved 30 minutes, after 30 minutes, lost efficacy, this history subscriber equipment is only sent to this Cellular Networks access device by meeting load information included in the linkage record of this timeliness threshold value,, only by being arranged in the included load information of linkage record within 30 minutes and being sent to the acquisition device 501 of this Cellular Networks access device, to ensure the ageing of this load information.Or further, when the load information of not requested this WLAN (wireless local area network) of transmission of this history subscriber equipment, or its linkage record exceedes this timeliness threshold value, this history subscriber equipment is deleted processing to this linkage record or load information.
4) acquisition device 501 in described Cellular Networks access device sends the load requests corresponding with described WLAN (wireless local area network) to multiple subscriber equipmenies; Described multiple subscriber equipment is measured the load information of described WLAN (wireless local area network), and the load information of the described WLAN (wireless local area network) measuring is sent to the acquisition device 501 in described Cellular Networks access device.
At this, acquisition device 501 in this Cellular Networks access device also can send the load requests corresponding with this WLAN (wireless local area network) to multiple subscriber equipmenies, for example, acquisition device 501 in this access device is by add the identification information of this WLAN (wireless local area network) in the specific fields of this load requests, and is sent to the plurality of subscriber equipment; The plurality of subscriber equipment is according to this load requests, from the specific fields of this request, extract this identification information, and based on this identification information, measure the load information of the corresponding WLAN (wireless local area network) of this identification information, and be sent to this access device, or, determine the linkage record with this WLAN (wireless local area network), or and then in conjunction with the timeliness threshold value of this linkage record, from this linkage record, the load information of this included WLAN (wireless local area network) is sent to the acquisition device 501 in this access device.Further, the acquisition device 501 in this connection device gets after the load information that the plurality of subscriber equipment sends, and can determine the final load information of this WLAN (wireless local area network).
Preferably, described Cellular Networks access device periodically or answer Event triggered and obtain the load information of adjacent WLAN (wireless local area network).At this, in the time that this Cellular Networks access device periodically obtains the load information of adjacent WLAN (wireless local area network), this access device should specify its adjacent WLAN (wireless local area network) to send the cycle of load information.In the time that this access device is answered Event triggered and obtained load information, this access device sends trigger condition to this adjacent WLAN (wireless local area network), if this adjacent WLAN (wireless local area network) meets this trigger condition, reports that corresponding load information is to this access device.
For example, to be periodically retrieved as example, the time interval of the access point of WLAN (wireless local area network) using specified cycle of access device as twice its load information of report.Be retrieved as example to answer Event triggered, Cellular Networks access device, in the specific fields of load requests, adds its granularity of wanting to receive load information (granularity).The access point of WLAN (wireless local area network) receives this load requests, with granularity included in this request, divide the load information of this WLAN (wireless local area network), to make it to be uniformly distributed into each rank, each load information when this WLAN (wireless local area network) from a change of rank to another grade, or the load information of this WLAN (wireless local area network) being when entering or exiting overload condition, this WLAN (wireless local area network) sends updating message to this access device, and this updating message comprises the up-to-date load information of this WLAN (wireless local area network).
At this, the load information of described WLAN (wireless local area network) comprises following at least any one:
The current wireless resource status of-described WLAN (wireless local area network);
The current hardware load of-described WLAN (wireless local area network);
The current backhaul load of-described WLAN (wireless local area network);
The load accepted of-described WLAN (wireless local area network).
This current Radio Resource state from scope 0 to 100%, show the present load situation of DL (Downlink, down link) and UL (Uplink, up link).Current hardware load represents with basic, normal, high and overload, shows the current hardware load of DL and UL.Current backhaul load represents with basic, normal, high and overload, shows the current backhaul load of DL and UL.Can accept load and show that DL and UL account for the percentage that total AP can ability to accept (know when total AP ability can the X3 interface between eNB and AP be set up, as, by WLAN version a/b/g/n).
Determining device 502 in Cellular Networks access device, according to the load information of described WLAN (wireless local area network), is determined the load condition of described WLAN (wireless local area network).Particularly, the load information of this WLAN (wireless local area network) that the determining device 502 in Cellular Networks access device is obtained according to acquisition device 501, as the current wireless resource status of this WLAN (wireless local area network), current hardware load, current backhaul load maybe can be accepted load etc., determine the load condition of this WLAN (wireless local area network), as whether this WLAN (wireless local area network) is in heavy duty state or whether this WLAN (wireless local area network) is in light-load state etc.
Adjusting device 503 in Cellular Networks access device, according to the load condition of described WLAN (wireless local area network), configures the corresponding subscriber equipment of described WLAN (wireless local area network) and carries out switching/route, to realize the load balancing under described heterogeneous network.Particularly, adjusting device 503 in Cellular Networks access device is according to the load condition of determining device 502 determined these WLAN (wireless local area network), configure the corresponding subscriber equipment of this WLAN (wireless local area network) and carry out switching/route, the WLAN (wireless local area network) or this Cellular Networks that are under light-load state as the subscriber equipment that is in the WLAN (wireless local area network) under heavy duty state is switched to, or the part carrying of the subscriber equipment that is in the WLAN (wireless local area network) under heavy duty state is routed to the WLAN (wireless local area network) or this Cellular Networks that are under light-load state, or reduce the WLAN (wireless local area network) even stoping to being in heavy duty situation and carry out switching/route, to realize the load balancing under this heterogeneous network.It should be noted at this, if this subscriber equipment is switched or part carrying routes to this and is in the WLAN (wireless local area network) under light-load state, within this subscriber equipment should be positioned at the coverage of this WLAN (wireless local area network).
Preferably, described adjusting device 503 comprises updating block (not shown) and command unit (not shown).This updating block, according to described load condition, upgrades reselection procedure/handover trigger parameter information of described WLAN (wireless local area network), and is sent to the corresponding subscriber equipment of described WLAN (wireless local area network).The measurement report that command unit returns according to described subscriber equipment, determines target UE, and sends switching/route instruction to described target UE, and wherein, the described reselection procedure/handover trigger parameter information of described measurement report based on after upgrading generates.
In a preferred embodiment, the included updating block of adjusting device 503 in this Cellular Networks access device is according to the load condition of this WLAN (wireless local area network), upgrade the reselection procedure/handover trigger parameter information for described WLAN (wireless local area network), as in the time that this WLAN (wireless local area network) is light-load state, turn down the condition switching on it, in the time that this WLAN (wireless local area network) is attached most importance to load condition, heighten condition switching on it etc., and the parameter information after this renewal is sent to the corresponding subscriber equipment of this WLAN (wireless local area network); Described subscriber equipment, according to the described reselection procedure/handover trigger parameter information after upgrading, generates the measurement report corresponding with described WLAN (wireless local area network), and is sent to described Cellular Networks access device; The included command unit of adjusting device 503 in described Cellular Networks access device is according to described measurement report, determine target UE, as determined, which target UE need to be from this WLAN (wireless local area network) switching/route out, or which target UE needs to switch/route to this WLAN (wireless local area network), and send switching/route instruction to described target UE; Described target UE is according to described switching/route instruction, with switch/routing operations of described WLAN (wireless local area network).
Preferably, when the load condition of this WLAN (wireless local area network) is light-load state, the measurement report that the included command unit of adjusting device 503 in this Cellular Networks access device sends according to subscriber equipment, determine the target UE that switches/route to described WLAN (wireless local area network), and send switching/route instruction to described target UE; This target UE, according to this switching/route instruction, switches to this WLAN (wireless local area network), or part carrying is routed to this WLAN (wireless local area network).
When the load condition of this WLAN (wireless local area network) load condition of attaching most importance to, the measurement report that the included command unit of adjusting device 503 in this Cellular Networks access device sends according to subscriber equipment, determine the target UE going out from described WLAN (wireless local area network) switching/route, and send switching/route instruction to described target UE; This target UE is according to this switching/route instruction, and this WLAN (wireless local area network) is switched out certainly, or part is carried from this WLAN (wireless local area network) route out.
At this, from this WLAN (wireless local area network) route, out this subscriber equipment some data flow is unloaded by this WLAN (wireless local area network) in part carrying.This unloaded data flow can be determined based on priority, QoS demand and/or service characteristic etc.The radio bearer that the RAN (Radio AccessNetwork, wireless access network) of 3GPP adheres to by release, initiates data flow unloading.
In one embodiment, 3GPP access device sends route messages to subscriber equipment, data are routed to this WLAN (wireless local area network).Meanwhile, radio bearer release message is sent to core network, and notifies the core net reason (as unloaded data by WLAN (wireless local area network)) that this radio bearer discharges.Subscriber equipment keeps two-way 3GPP and the WLAN (wireless local area network) of being connected to.The data that belong to d/d radio bearer communicate by WLAN (wireless local area network) and subscriber equipment.
Preferably, adjusting device 503 in this Cellular Networks access device also comprises notification unit, switching/the route instruction for target UE that this notification unit sends according to this Cellular Networks access device, switch/route of target UE described in notice core network element.Core network element, according to this notice, is realized path between Cellular Networks and WLAN (wireless local area network) and is switched; For example, for switching, all data flow switch; For route, only partial data stream exchanges.
It should be noted that the present invention can be implemented in the assembly of software and/or software and hardware, for example, can adopt application-specific integrated circuit (ASIC) (ASIC), general object computer or any other similar hardware device to realize.In one embodiment, software program of the present invention can carry out to realize step mentioned above or function by processor.Similarly, software program of the present invention (comprising relevant data structure) can be stored in computer readable recording medium storing program for performing, for example, and RAM memory, magnetic or CD-ROM driver or floppy disc and similar devices.In addition, steps more of the present invention or function can adopt hardware to realize, for example, thereby as coordinate the circuit of carrying out each step or function with processor.
In addition, a part of the present invention can be applied to computer program, and for example computer program instructions, in the time that it is carried out by computer, by the operation of this computer, can call or provide the method according to this invention and/or technical scheme.And call the program command of method of the present invention, may be stored in fixing or movably in recording medium, and/or be transmitted by the data flow in broadcast or other signal bearing medias, and/or be stored in according in the working storage of the computer equipment of described program command operation.At this, comprise according to one embodiment of present invention a device, this device comprises memory for storing computer program instructions and the processor for execution of program instructions, wherein, in the time that this computer program instructions is carried out by this processor, trigger this device and move based on aforementioned according to the method for multiple embodiment of the present invention and/or technical scheme.
To those skilled in the art, obviously the invention is not restricted to the details of above-mentioned example embodiment, and in the situation that not deviating from spirit of the present invention or essential characteristic, can realize the present invention with other concrete form.Therefore, no matter from which point, all should regard embodiment as exemplary, and be nonrestrictive, scope of the present invention is limited by claims instead of above-mentioned explanation, is therefore intended to all changes that drop in the implication and the scope that are equal to important document of claim to be included in the present invention.Any Reference numeral in claim should be considered as limiting related claim.In addition, obviously other unit or step do not got rid of in " comprising " word, and odd number is not got rid of plural number.Multiple unit of stating in device claim or device also can be realized by software or hardware by a unit or device.The first, the second word such as grade is used for representing title, and does not represent any specific order.

Claims (12)

1. for realizing a method for load balancing under the heterogeneous network of Cellular Networks and WLAN (wireless local area network), wherein, the method comprises the following steps:
A Cellular Networks access device obtains the load information of adjacent WLAN (wireless local area network), and wherein, described Cellular Networks and described WLAN (wireless local area network) form heterogeneous network;
B, according to the load information of described WLAN (wireless local area network), determines the load condition of described WLAN (wireless local area network);
C, according to the load condition of described WLAN (wireless local area network), configures the corresponding subscriber equipment of described WLAN (wireless local area network) and carries out switching/route, to realize the load balancing under described heterogeneous network.
2. method according to claim 1, wherein, described step c comprises:
C1, according to described load condition, upgrades the reselection procedure/handover trigger parameter information for described WLAN (wireless local area network), and is sent to the corresponding subscriber equipment of described WLAN (wireless local area network);
Described in c2, subscriber equipment, according to the described reselection procedure/handover trigger parameter information after upgrading, generates the measurement report corresponding with described WLAN (wireless local area network), and is sent to described Cellular Networks access device;
Described in c3, Cellular Networks access device, according to described measurement report, is determined target UE, and sends switching/route instruction to described target UE;
Described in c4, target UE is according to described switching/route instruction, with switch/routing operations of described WLAN (wireless local area network).
3. method according to claim 2, wherein, described load condition comprises light-load state, wherein, described step c3 comprises:
-described Cellular Networks access device, according to described measurement report, is determined the target UE that switches/route to described WLAN (wireless local area network), and sends switching/route instruction to described target UE.
4. method according to claim 2, wherein, described load condition comprises heavy duty state, wherein, described step c3 comprises:
-described Cellular Networks access device, according to described measurement report, is determined the target UE going out from described WLAN (wireless local area network) switching/route, and sends switching/route instruction to described target UE.
5. according to the method described in any one in claim 1 to 4, wherein, described step a comprises:
-described Cellular Networks access device, by the first predetermined interface, sends load requests to described WLAN (wireless local area network);
-described WLAN (wireless local area network), according to described load requests, detects the load information of described WLAN (wireless local area network), and is sent to described Cellular Networks access device.
6. according to the method described in any one in claim 1 to 4, wherein, described step a comprises:
-described Cellular Networks access device, by the second predetermined interface, sends load requests to the network element of core net, and wherein, described core net is corresponding with described Cellular Networks and described WLAN (wireless local area network);
Described load requests is forwarded to described WLAN (wireless local area network) by-described network element;
-described WLAN (wireless local area network), according to described load requests, detects the load information of described WLAN (wireless local area network), and is sent to described network element;
-described network element receives the load information of described WLAN (wireless local area network), and is forwarded to described Cellular Networks access device.
7. according to the method described in any one in claim 1 to 4, wherein, described step a comprises:
The corresponding historical subscriber equipment of-described WLAN (wireless local area network) according to the linkage record of described WLAN (wireless local area network), and in conjunction with the timeliness threshold value of described linkage record, the load information of described WLAN (wireless local area network) included in described linkage record is sent to described Cellular Networks access device.
8. method according to claim 7, wherein, described step a also comprises:
-described Cellular Networks access device sends the load requests corresponding with described WLAN (wireless local area network) to multiple subscriber equipmenies;
-described multiple subscriber equipmenies are measured the load information of described WLAN (wireless local area network), and the load information of the described WLAN (wireless local area network) measuring is sent to described Cellular Networks access device.
9. according to the method described in any one in claim 1 to 8, wherein, described step a comprises:
-described Cellular Networks access device periodically or answer Event triggered and obtain the load information of adjacent WLAN (wireless local area network).
10. according to the method described in any one in claim 1 to 9, wherein, the load information of described WLAN (wireless local area network) comprises following at least any one:
The current wireless resource status of-described WLAN (wireless local area network);
The current hardware load of-described WLAN (wireless local area network);
The current backhaul load of-described WLAN (wireless local area network);
The load accepted of-described WLAN (wireless local area network).
11. 1 kinds for realizing the Cellular Networks access device of load balancing under the heterogeneous network of Cellular Networks and WLAN (wireless local area network), and this equipment comprises:
Acquisition device, for obtaining the load information of adjacent WLAN (wireless local area network), wherein, described Cellular Networks and described WLAN (wireless local area network) form heterogeneous network;
Determining device, for according to the load information of described WLAN (wireless local area network), determines the load condition of described WLAN (wireless local area network);
Adjusting device, for according to the load condition of described WLAN (wireless local area network), configures the corresponding subscriber equipment of described WLAN (wireless local area network) and carries out switching/route, to realize the load balancing under described heterogeneous network.
12. Cellular Networks access devices according to claim 11, wherein, described adjusting device comprises:
Updating block, for according to described load condition, upgrades reselection procedure/handover trigger parameter information of described WLAN (wireless local area network), and is sent to the corresponding subscriber equipment of described WLAN (wireless local area network);
Command unit, for the measurement report returning according to described subscriber equipment, determine target UE, and send switching/route instruction to described target UE, wherein, the described reselection procedure/handover trigger parameter information of described measurement report based on after upgrading generates.
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