KR20030006649A - A method of adjusting a control channel according to traffic over next generation wireless network - Google Patents

Abstract

PURPOSE: A method for adjusting a control channel according to a traffic in an advanced radio network is provided to toss a control channel right about UEs(User Equipments) to another usable node B before performing a call process in case that the UEs are concentrated in a node B. CONSTITUTION: The number of UEs located in a nodes B(10,12,14,16) of each cell is grasped. A node B(10,12,14,16) in which the number of grasped UEs exceeds a previously designated number is searched, or a node B(10,12,14,16) in which it is difficult to process new origination and termination signals by the occupation of resources is searched. A UE located in a common region in which a cell region is overlapped with an adjacent node B is selected among the UEs in which a control channel of the searched node B(10,12,14,16) is set as a main control channel. A plurality of active sets are managed as to the selected UE before call process. The control channel of the adjacent node B is changed to the main control channel on the basis of active set information and cell information.

Description

A method of adjusting a control channel according to traffic over next generation wireless network}

The present invention relates to a control channel adjustment method according to traffic in a next-generation wireless network, and more particularly, to transfer a control channel right for a mobile terminal to another base station available before performing call processing in a situation where the mobile station is concentrated in a base station. It's about one way.

Conventionally, in the second generation wireless network composed of a base station, a base station controller, a switch, and the like, since a handover function is processed by the switch, only a network management function according to the resource occupancy of the switch exists.

Therefore, since the exchange cannot reserve the resources of the base station or the base station controllers when the resources of the base station or the base station controller are heavily used, call failures frequently occur in the originating or terminating processing of the mobile terminal.

In the 3rd generation wireless network, unlike the 2nd generation wireless network, the standardization considering the handover function can be performed in the exchange and the base station controller.

However, these handover functions are limited to the occurrence of busy or abnormal conditions. Therefore, the call failure rate of a mobile terminal in a base station or a base station controller area in a high traffic load area is inevitably high as in a second generation wireless network.

1 is a general configuration diagram of a next generation wireless network, and shows an interworking relationship of an IMT-2000 network.

Each wireless terminal can make a call in the cell area 20 to 26 that each base station (Node-B) 10 to 16 can detect. Each of the base stations 10 to 16 is connected to a Radio Network Controller (RNC) 30 to perform a radio matching function with the wireless terminal. The base station controller 30 controls each of the connected base stations 10 to 16 to manage radio resources with each wireless terminal, performs power control and handover time detection, and performs handover between other base station controllers. do.

The Serving GPRS Support Node (SGSN) / Mobile Switching Center (MSC) 40 constituting the core network interworks with a plurality of base station controllers 30 to perform a substantial network interworking function. Performs the handover function between the MSC or SGSN and the operation according to the handover point of time reporting. The Gateway GPRS Support Node (GGSN) 50 interworks with the SGSN to perform interworking with the Internet or a General Packet Radio System (GPRS) backbone network. Reference numeral 27 is a common area where the cell areas 20 to 26 of the base stations 10 to 16 overlap.

In the general next generation wireless network configured as described above, a mobile terminal located in an area 20 to 26 that can be detected by each base station 10 to 16 is concentrated and used in a specific area or a specific base station (for example, 10). In this case, the wired resources connected between the base station controller 30 and the base station 10 and the radio resources of the base station 10 are limited, so that call resources cannot be allocated to the mobile terminals in the corresponding base station 10 area.

This often happens in places where many people temporarily gather, such as important performances or stadiums. In this case, both the incoming call to the mobile terminal and the call originating from the mobile terminal do not make a phone call with a busy signal. That is, a problem arises in that the call failure rate is increased for the call originating from the mobile terminal and all the calls received by the mobile terminal due to the concentration of the mobile terminal in the base station.

The present invention has been proposed to solve the above-mentioned problems, and the control channel according to traffic in the next generation wireless network to provide a more stable call access service of the mobile terminal and efficiently distribute the radio network resources by lowering the call failure rate The purpose is to provide a method of adjustment.

1 is a configuration diagram of a typical next-generation wireless network,

2 is a configuration diagram of UTRAN to which the present invention is applied;

3 to 5 are flowcharts illustrating a control channel adjustment method according to traffic in a next generation wireless network according to an embodiment of the present invention.

※ Explanation of code for main part of drawing

10, 12, 14, 16: base station 20, 22, 24, 26: cell area

30: base station controller 31, 32, 33, 34: base station matching unit

35: path controller 36: handover controller

37 traffic control 38 call control means

40: SGSN / MSC50: GGSN / Dams

In order to achieve the above object, a control channel adjustment method according to traffic in a next generation wireless network according to a preferred embodiment of the present invention includes: a first step of identifying the number of mobile terminals located in a base station of each cell; A second step of finding a base station having a predetermined number of mobile terminals exceeding a predetermined number or a base station having difficulty in processing a new call signal due to resource occupancy; And selecting a mobile terminal located in a common area where a neighboring base station and a cell area overlap among mobile terminals in which the control channel of the found base station is set as a main control channel, and manages a plurality of active sets for the selected mobile terminals before call processing. Meanwhile, a third process of changing the control channel of the neighboring base station to become the main control channel is performed based on the active set information and the cell information.

Hereinafter, a control channel adjustment method according to traffic in a next generation wireless network according to an embodiment of the present invention will be described with reference to the accompanying drawings.

2 is a configuration diagram of a UTRAN to which the present invention is applied. The UTRAN includes a mobile terminal, a base station 10, 12, 14, 16, and a base station controller 30.

The base station controller 30 includes a plurality of base station matching units 31, 32, 33, which provide a physical connection path, a control signal, and a data transmission path with each of the node-Bs 10, 12, 14, and 16. 34); A path control unit 35 of a switch type for controlling a transmission path between the plurality of base station matching units 31, 32, 33, and 34 and the SGSN / MSC 40, of each of the base stations 10, 12, 14, and 16. A handover control unit 36 for controlling power control and handover of the mobile terminal and each base station 10, 12, 14, 16 in the control right, each base station matching unit 31, 32, 33, 34 and the path And a call control means 38 having a traffic control unit 37 for monitoring the traffic of the data and control signals transmitted from the control unit 35 and delivering the expected load of the traffic to the handover control unit 36.

In FIG. 2, reference numeral 41 denotes a call path for transferring data between each base station matching unit 31, 32, 33, and 34 and SGSN / MSC 40, and reference numeral 43 denotes each base station matching unit 31, 32, 33, 34 and the control unit 35, 36, 37 is a path for transmitting the internal control message, reference numeral 45 is a path for transmitting the control information and the external SGSN / MSC 40. Reference numeral 47 is a group of call paths 41 existing in the base station controller 30.

The mobile terminal capable of wireless communication with each of the base stations 10, 12, 14, and 16 includes a radio control channel with the base stations 10, 12, 14, and 16, and each of the base stations 10, 12, 14, and 16. Control path 49 between base station matching units 31, 32, 33, 34, base station matching units 31, 32, 33, 34, internal control message transmission path 43, external control information transmission path 45 A procedure such as cell information change is performed to the SGSN / MSC 40 sequentially.

In addition, the mobile terminal includes a wireless control channel with the base stations 10, 12, 14, 16, and a control path between the base stations 10, 12, 14, 16 and the base station matching unit 31, 32, 33, 34 ( 49), the base station matching section 31, 32, 33, 34, and the internal control message transmission path 43 sequentially to the handover control section 36 from each of the base stations 10, 12, 14, 16; It transmits the information on the received radio signal reception sensitivity and the information about the neighbor base station.

Upon receiving this information, the handover control unit 36 places information on the base stations corresponding to the radio signal provided by the mobile terminal in the queue.

In particular, the mobile terminal maintains the primary base station (eg, 10) and the control information transmission path 49 which currently perform the control right, while the secondary base stations (eg, 12, 14, And a control information transmission path 49 with 16). In this case, when the location of the mobile terminal is located in the common area 27, even if the base station 12, 14, 16 is capable of making and receiving calls, the base station 10 may not be handed over. In and out is made.

Next, a control channel adjustment method according to traffic in a next generation wireless network according to an embodiment of the present invention will be described with reference to the flowcharts of FIGS. 3 to 5.

Prior to the description of the embodiment of the present invention, it is assumed that the base station controller 30 manages an active set for all terminals (all terminals in a busy or disconnected state) receiving multiple base station radio waves.

First, the base station matching section 31, 32, 33, 34 of the base station controller 30 occupies a state of possession of the control path 49 with each mobile terminal and a data (call) transmission path 41 with each mobile terminal. The resource occupancy state is monitored, and the path control unit 35 monitors actual traffic data of data transmitted between the base station matching units 31, 32, 33, and 34 and the SGSN / MSC 40 (step S10). This is called monitoring the internal load of the base station controller 30.

Thereafter, the path control unit 35 and the base station matching unit 31, 32, 33, and 34 periodically collect the resource occupancy degree and traffic monitoring data collected by the traffic control unit 37 through the internal control message transmission path 43. On the other hand, the handover control unit 36 transmits the main control channel information used in the actual call attempt to the traffic control unit 37 via the internal control message transmission path 43 (step S12).

Accordingly, the traffic controller 37 calculates the number of mobile terminals located in each base station 10, 12, 14, 16 based on the received control path 49 occupancy information and main control channel information. Based on the occupancy state and traffic information of the data (call) transmission path 41, the currently used resource and the idle resource are calculated (steps S14, S16).

Based on the calculated data, the traffic controller 37 finds a base station (eg, assumed to be 10) at which the mobile terminal exceeds an average acceptable amount, and makes a new arrival and departure in consideration of the calculated idle resources and average talk time. A base station (e.g., assumed to be 10) having difficulty in signal processing is found (step S18).

In this way, as the base station (i.e., 10) in which a large number of mobile terminals are located or a base station (i.e., 10) that is difficult to process an originating signal due to resource occupancy is found, the traffic control unit 37 determines the internal control message transmission path 43. This information is transmitted to the handover control unit 36 (that is, information that a large number of mobile terminals are located in the base station 10 or that the base station 10 is difficult to process the call-in signal) (step S20).

Subsequently, since the handover control unit 36 stores the information on the radio signal reception sensitivity provided from each base station 10, 12, 14, 16, and information on the neighboring base station, the handover control unit 36 As the information in step S20 is received, the primary control channel is located in the corresponding base station 10 and is included in the common area 27 among the mobile terminals configured with the corresponding base station 10. In step 16), the mobile terminal in a state where call arrival and reception is sufficiently possible is selected (step S22).

Thereafter, the handover controller 36 generates a handover occurrence event message (eg, Relocation Required) for the selected mobile terminals, and transmits the generated handover occurrence event information to the external control information transmission path 45. It transmits to SGSN / MSC 40 via the cell information change process of HLR / VLR connected to SGSN / MSC 40 (step S24, S26).

According to the result of the cell information update, the SGSN / MSC 40 determines that the base station controller differs from the primary control channel 49 used at the current call attempt and the current secondary control channel (another 49) which is a channel to be handed over. If the channel belongs to (RNC), the SGSN / MSC 40 performs a procedure for transferring control to the target base station controller (RNC) (step S28).

Thereafter, the SGSN / MSC 40 transmits a handover response message (eg, a relocation command) to the handover control unit 36 through the external control information transmission path 45 (step S30).

When the handover control unit 36 receives the handover response message, the main control channel 49 used for the current call attempt and the current sub control channel (another 49), which is a handover target channel, are the same base station controller ( 30, it is judged whether or not it belongs (step S32).

As a result of the determination, when belonging to the same base station controller 30 (" Yes " in step S32), the handover control unit 36 sends a message for requesting a control channel change between the primary base station 10 and the secondary base station (e.g., Active Set Update Command) is generated and transmitted to the corresponding mobile terminal (step S34). In the case of a control channel change between the primary base station and the secondary base station, the handover control unit 36 provides a predetermined number of base station priority information (i.e., active set) for each mobile terminal. Information). For example, when there is a large amount of mobile terminals in the cell region 20 that cannot be sufficiently covered by the base station 10, the control right of the mobile terminal located in the common region 27 is transferred to the cell adjacent to the cell region 20. The base station is transferred to the base station in any one of the areas 22, 24, and 26, and the highest priority part is based on the active set information (also referred to as serving Node B information) managed by the handover control unit 36. Control is passed to the base station. In other words, the base station priority information is information indicating a priority for candidate neighboring base stations (i.e., secondary base stations) to give control of the mobile terminal. The handover control unit 36 has the base station priority information for each mobile terminal. Accordingly, when the control channel change is necessary, the handover controller 36 selects the candidate neighbor base station having the highest priority from the active set information for the mobile terminal (ie, the secondary base station).

Subsequently, the mobile terminal changes the control channel to the secondary base station based on the received control channel change request message (eg, Active Set Update Command) and then generates a completion message (eg, Active Set Update Complete) to generate a primary control channel ( 49) and the completion message to the handover control unit 36 via the internal control message delivery path 43. Receiving the completion message, the handover control unit 36 sets the primary control channel 49 used for the previous call attempt as the secondary control channel, and sets the secondary control channel (another 49), which is the handover target channel, in the subsequent call attempt. Set to the main control channel used in step S36 and S38. Accordingly, even if a plurality of mobile terminals are located in the base station jurisdiction, free transmission / reception resources can be secured.

On the other hand, if the primary control channel 49 used in the current call attempt and the current secondary control channel (another 49), which is a handover target channel, belong to another base station controller in step S32, the primary control channel 49 used in the current call attempt is used. The base station controller to which the primary control channel 49 belongs generates a message for transferring control to the other base station controller to which the secondary control channel (another 49) belongs, and through the SGSN / MSC 40, the secondary control channel belongs. Transfer to another base station controller (step S40).

Accordingly, when the message about the control right in the other base station controller is transmitted to the base station controller 30, the base station controller 30 requests a change of the control channel between the primary base station 10 and the secondary base station (eg, Active Set Update Command) is generated and transmitted to the corresponding mobile terminal (step S42).

Subsequently, the mobile terminal transmits a completion message (eg, Active Set Update Complete) to the handover control unit 36 in the base station controller 30 through the main control channel 49 and the internal control message transmission path 43. . Receiving the completion message, the handover control unit 36 sets the primary control channel 49 used for the previous call attempt as the secondary control channel, and sets the secondary control channel (another 49), which is the handover target channel, in the subsequent call attempt. Set to the main control channel used in step S44 and S46. Accordingly, even if a plurality of mobile terminals are located in the base station jurisdiction, free transmission / reception resources can be secured.

As described in detail above, according to the present invention, when there are more mobile terminals than the number of mobile terminals that can be accommodated in the base station, before the call processing of the control area of the mobile terminal located in the common area where the signals of the areas of other adjacent base stations are received together. By forcibly moving to the control area of another neighboring base station in the step, it provides more stable call connection service of the mobile terminal and more efficiently distributes the radio network resources.

As a result, the present invention induces efficient use of radio resources to help build an optimal radio network.

On the other hand, the present invention is not limited only to the above-described embodiment, but can be modified and modified within the scope not departing from the gist of the present invention, the technical idea to which such modifications and variations are also applied to the claims Must see

Claims (6)

A first step of identifying the number of mobile terminals located in the base station of each cell; A second step of finding a base station having a predetermined number of mobile terminals exceeding a predetermined number or a base station having difficulty in processing a new call signal due to resource occupancy; And Among the mobile terminals in which the control channel of the found base station is set as the main control channel, mobile terminals located in a common region where the neighboring base station and the cell region overlap with each other are managed, and the selected mobile terminals manage a plurality of active sets before call processing. And a third process of changing a control channel of an adjacent base station to become a primary control channel based on the active set information and the cell information. The method of claim 1, The first process may include: a first step of monitoring, by a base station controller, an occupation state of a control path with each mobile terminal and a resource occupation state of a data transfer path with each mobile terminal; And a second step of calculating the number of mobile terminals located in each base station based on the control path occupancy information and the set main control channel information according to the monitoring result. Adjustment method. The method of claim 2, The second process is based on the occupied state and traffic information of the data transmission path and the idle resources currently collected by monitoring the actual traffic data of the data being transmitted through the data transmission path with each mobile terminal. Based on the calculated result, find a base station exceeding the average acceptable call volume, and find the base station with a saturated number of terminals through the procedure of the first step, and calculate the idle resources and the average talk time or Control channel adjustment method according to traffic in the next generation wireless network, characterized in that finding the base station difficult to process the new on-demand signal in consideration of the number of terminals. The method of claim 1, The third process may be used when attempting a current call based on the updated cell information obtained by transmitting a handover occurrence event message for the selected mobile terminal to an exchange to update cell information of the selected mobile terminal. When the primary control channel and the handover target channel belong to the same base station controller, A message requesting a control channel change between a primary base station of the primary control channel and a secondary base station of the handover target is transmitted to a corresponding mobile terminal, and the handover target channel is received as a completion message from the mobile terminal is received. Method of adjusting the control channel according to traffic in the next generation wireless network, characterized in that to set the main control channel used when the call attempt. The method of claim 1, The third process may be used when attempting a current call based on the updated cell information obtained by transmitting a handover occurrence event message for the selected mobile terminal to an exchange to update cell information of the selected mobile terminal. If the primary control channel and the handover target channel belong to different base station controllers, Produces a message for transferring control to another base station controller belonging to the handover target channel and transmits the message to the other base station controller, and receives a message for obtaining control right from the other base station controller. A message for requesting a control channel change between a primary base station and a secondary base station of the handover target channel is transmitted to a corresponding mobile terminal, and upon completion of a call attempt, the handover target channel is received as a completion message from the mobile terminal is received. Control channel adjustment method according to traffic in the next generation wireless network, characterized in that the primary control channel to be used. The method according to any one of claims 1 to 4, wherein The third process includes selecting a control channel of a candidate neighbor base station having the highest priority among the candidate neighbor base stations in the active set for the selected mobile terminal managed by the base station controller when the primary control channel for the selected mobile terminal is changed. Control channel adjustment method according to traffic in the next generation wireless network, characterized in that the primary control channel.