RU2265966C2 - Method for transferring control information about routing zone to routing zone with network radio access override - Google Patents

Abstract

FIELD: mobile communications.

SUBSTANCE: radio access network has multiple radio network controllers for setting one or more routing zones with override, while each routing zone with override has cell, controlled by first radio network controller, and at least one cell, controlled by one of multiple radio network controllers. When client terminal device enters routing zone with override (in which second radio network controller also controls cells), first radio network controller via additional signal message sends to servicing radio network controller an address of first radio network controller, and address of other controllers, controlling cells in routing zone with override.

EFFECT: servicing controller provides personal call for client terminal device across whole routing zone with override.

3 cl, 8 dwg

Description

This application is based on the following provisional US patent applications, which are incorporated herein by reference: provisional U.S. patent application with registration number 60/152345, filed September 7, 1999, and provisional US patent application with registration number 60/153695, filed September 14, 1999

The present invention relates to cellular radio communication networks and, in particular, to the transfer of service of devices of mobile terminals of a subscriber (TA) from one routing zone to another.

In cellular communication systems, a wireless communication channel (for example, a radio interface) is used between the device (mobile) of the subscriber terminal (TA) and the base station (BS) node. The base station assembly contains transmitters and receivers for radio communication with multiple subscriber terminal devices. One or more nodes of the base station are connected (for example, by a land line or radio relay line) and controlled by a radio network controller node (also known in some networks as a base station controller (BSC)). The radio network controller node, in turn, is connected via control nodes to the core communication network. The control nodes can take various forms depending on the type of service or network to which the control nodes are connected. To connect to connection-oriented networks with circuit switching, such as a public switched telephone network (PSTN) and / or a digital network with service integration (ISDN), the mobile switching center (MSC) can be the control node. To connect to packet-switched data services, such as the Internet (for example), the control node can be a gateway data transfer support node through which it is connected to wired data transmission networks, and, possibly, one or more serving nodes.

A radio access network (RDS) covers a geographic area that is divided into cell zones, with each cell zone being served by a base station. A cell is a geographical area where the radio coverage area is provided by the radio equipment of the base station at the location of the base station. Each cell is identified by a unique identifier, which is transmitted by the broadcast message in the cell.

One example of a radio access network is the terrestrial radio access network of the universal mobile communications system (USPS). The UNSSR is a third-generation system that, in some respects, is built on radio access technology, known as the Global System for Mobile Communications (GPS), developed in Europe. UNSSR is essentially a Code Division Multiple Access (WDMC) broadband access system. The terrestrial radio access network of the universal mobile communications system (USPS) (UNSR) makes connections with both circuit switching and packet switching. In this regard, in the UNSR, circuit switched connections use a radio network controller (RNC) communicating with a mobile switching center (CSC), which, in turn, is connected to a connection-oriented external core network, which can be (for example) a public switched telephone network Use (PSTN) and / or Integrated Services Digital Network (ISDN). On the other hand, in UNSR, packet-switched connections use a radio network controller that communicates with the serving support node for the OUPR (General Packet Radio Service) (OPUO) service, which in turn is connected through the backbone network and the gateway OUPR service support node (UPUPO) to the networks packet switched (e.g. Internet, X.25 external networks).

Cellular radio communication networks use a feature called handover to continue established calls when a subscriber’s mobile terminal device moves between different cells in the radio access network. The principles of handover are described, at least in part, for example, in the application for a US patent with registration number 09/035821 "Inter-office transmission of measurements in communication" and the application for US patent with registration number 09/035788 "Inter-office congestion control in communication", which are both incorporated herein by reference.

In order to maintain TA with low activity and low use of radio resources, the concept of the UNR routing zone (ZMU) and the adjustment of the UNR routing zone (adjustment of the ZMU) were introduced into the USPS. The routing zone of the UNSR (ZMU) is a geographical area containing one or more cells. Each memory is identified by a unique identifier, which is transmitted by a broadcast message in all cells belonging to the memory. ZMU may contain cells controlled by more than one radio network controller (RNC). In this regard, a memory with cells of more than one radio network controller (RNC) is referred to as overlapping memory.

Subscriber terminal devices that have low activity (there is no transfer of subscriber data) at the moment, can be switched to the state of "connection to ZMU". In the "connected to the memory" state, the subscriber's terminal device will only report changes in its location when moving from one memory to another. The present invention is intended, but not limited to, cellular networks, where the existence of a memory or their equivalents allows the subscriber terminal device to remain "connected" to the network in a state of low activity, using the minimum resources of the radio interface.

The radio access network comprises a plurality of radio network controllers, including a first radio network controller. A plurality of radio network controllers are arranged to establish one or more overlapping routing zones, each overlapping routing zone comprising a cell controlled by a first radio network controller and at least one cell controlled by another of a plurality of radio network controllers. For signaling purposes, the first radio network controller only needs to store network addresses: (1) any of the many radio network controllers that controls the cell in any routing area with overlapping; and (2) any of a plurality of radio network controllers that functions as a serving radio network controller for a connection for which the first radio network controller functions as a passive radio network controller.

When the subscriber’s terminal device enters the routing zone with overlapping (in which the second radio network controller also controls the cells), the first radio network controller sends in a signal message to the serving radio network controller both (1) the address of the first radio network controller and (2) the address of other radio network controllers that control cells in the overlapping routing zone. The information storage and signaling in accordance with the present invention allows the serving radio network controller to make a personal call to the subscriber's terminal device over the entire routing area with overlap.

The above and other objects, features and advantages of the invention are apparent from the following more detailed description of the preferred embodiments shown in the accompanying drawings, in which items refer to like elements in all of the drawings. The drawings are optionally made to scale, with emphasis instead being placed on illustrating the principles of the invention.

Figure 1 presents a schematic view of a primary radio access network.

Figure 2 presents a schematic view of the primary radio access network and shows three devices of the subscriber terminal (TA) at a certain point in time.

FIG. 3 is a schematic view of a primary radio access network and three subscriber terminal (TA) devices are shown at a time following a time in FIG. 2.

FIG. 4 is a schematic representation of messages transmitted between a radio network controller (RNC) and a serving radio network controller (RNC), for the procedure of FIG. 3.

FIG. 5 is a schematic view of a primary radio access network and a first exemplary procedure is shown in which a subscriber terminal (TA) device adjusts a memory in accordance with the present invention.

FIG. 6 is a schematic representation of a cattle-cattle signaling procedure for supporting adjustment of a ZMU according to the invention according to the procedure of FIG. 5.

FIG. 7 is a schematic view of a primary radio access network and a second exemplary procedure is shown in which a subscriber terminal (TA) device adjusts a memory in accordance with the present invention.

On Fig presents a schematic representation of the signaling procedure of cattle-cattle to support the adjustment of ZMU according to the invention according to the procedure in Fig.7.

In the following description, for purposes of explanation, and not limitation, specific details, such as architectures, interfaces, methods, etc., are set forth in order to provide a thorough understanding of the present invention. For specialists in this field of technology, however, it is obvious that the present invention can be implemented in the form of other embodiments, which in specific details differ from those described. In other cases, a detailed description of well-known devices, circuits, and methods is omitted so as not to obscure the description of the present invention with optional details.

1 shows the basic architecture of a typical radio access network 20. The radio access network 20 comprises a plurality of radio network controllers (RNC) 24, of which FIG. 1 shows three illustrative RNCs, in particular RNC 24 ₁ — RNC 24 ₃ . Radio network controllers (RNC) 24 control radio resources and the possibility of radio connections within a group of cells. Each radio network controller (RNC) 24 is connected to and controls one or more base stations, with each base station typically serving one or more cells. In this regard, radio network controllers (RNCs) 24 are often referred to as “base station controller” or BSC nodes.

Although the base stations themselves are not shown in FIG. 1, the cells they serve are shown. A cell is a geographical area where the coverage area is provided by the radio equipment of the base station at the location of the base station. Each cell is identified by a unique identifier, which is transmitted by the cell broadcast message. As shown in figure 1, the controller 24 ₁ radio network (cattle) controls the cells C _{1: 1} -C _{1: 5} ; the radio network controller ( ₂ ) 24 24 controls the cells C _{2: 1} -C _{2: 5} ; a radio network controller 24 ₃ (RNC) controls the cells C _{3: 1} -C _{3: 5} . In the cell notation system, the first subscript corresponds to the subscript of a particular radio network controller (RNC) 24, which controls the cell, the second lower index forms a series of cells controlled by the radio network controller 24 (RNC).

In the radio access network 20, numerous routing zones (for example, UNSR routing zones) are defined, in particular, by way of example, routing zones ZMU ₁ -3MU ₆ . As mentioned above, a routing zone (ZMU) is a geographic area including one or more cells. For example, ZMU ₁ includes cells C _{1: 1} and C _{1: 2} ; ZMU ₂ includes cells C _{1: 3} , C _{1: 4} and C _{1: 5} , etc. Each ZMU is identified by a unique identifier, which is transmitted by broadcast message to all cells belonging to the ZMU. ZMU may include cells controlled by more than one radio network controller (RNC). For example, ZMU ₅ includes cells C _{2: 5} , C _{3: 1} , C _{3: 2} and C _{3: 3} , of which cell C _{2: 5} is controlled by the controller 24 ₂ radio networks (KRS), while cells C _{3: 1} , C _{3: 2} and C _{3: 3} are controlled by a 24 ₃ radio network controller (RNC). Thus, ZMU ₅ is an example of ZMU with overlap.

Figure 1 further shows that each radio network controller (RNC) 24 is connected to a signaling network 30. The signaling network 30 carries out signaling between the radio network controllers (RNC) 24, for example, to support the continuation of established connections when a subscriber terminal device (TA) moves between cells controlled by different RNCs in the radio access network 20. The signaling network 30 may be, for example, a signaling network (for example, channel-wide signaling system No. 7).

Each radio network controller 24 (RNC) connected to a core network (BST) 32. Although in Figure 1 for simplicity, only the radio network controller ₂₄ January (RNC) has an interface with a core network (BST) 32, it is understood that the controller ₂₄ February radio network (RNC ) and a radio network controller (RNC) 24 ₃ may also have an interface with a core network (BS) 32. The core network (BS) 32 typically comprises a plurality of nodes. Radio network controllers 24 (RNC) can all be connected to one node of the core network (BS), or, alternatively, radio network controllers 24 (RNC) can be connected to different nodes of the core network.

A subscriber’s terminal device (TA) is a mobile terminal through which a subscriber can access services offered by the operator’s core network (BS), i.e. the core network (BS) 32. The devices of the subscriber terminal (TA) can be mobile stations, such as mobile phones ("cell" phones), and compact laptop computers with terminal equipment of the mobile station and, thus, can be, for example, portable, handheld, handheld, mobile devices installed in a computer or installed in a car that carry out voice communication and data transmission with a radio access network.

Depending on the BST-TA connection, a particular radio network controller (RNC) 24 may be either serving RNC (RNC) or passive RNC (RNC). OCRS (serving cattle) is responsible for connecting to TA, i.e. he has full control of this connection within the radio access network 20. OCDS is connected to the core network (BS) 32. PCRS (passive cattle), on the other hand, supports OCRS with radio resources to connect to a TA that needs radio resources in cells controlled by PCRS.

The radio access network 20 determines the role of the radio network controller (RNC) 24, i.e. should it be OKRS or PKRS when a TA-BSt connection is established. Typically, the radio network controller (RNC) 24, which controls the cell where the connection to the TA is initially established, is assigned the role of OCRS for this connection to the TA. As the TA moves, the connection is maintained by establishing radio branches through new cells, possibly also including cells controlled by other RNCs.

The above roles are also relevant when the TA is in a state of low activity (connection to the memory) and reports only a change in its location based on the memory (and not on the basis of cells). Management of TA in a state of low activity remains in OCD. Each radio network controller (RNC) can act or function as a serving RNC (RNC) for one TA and, on the other hand, act or function simultaneously as a passive RNC (RNC) for another TA.

In figure 2, the controller 24 ₁ radio network (cattle) acts as OCRS for connections with TA1, TA2 and TA3. The connection with TA2 after successive adjustments of the ZMU is established through the ZMU (and the cell) controlled by KRS 24 ₂ , thereby acting as PCRS for this connection. The connection with TA3 after successive adjustments of the ZMU is now established through the ZMU (and the cell) controlled by KRS 24 ₃ , thereby acting as PCRS for this connection.

In the state of “connecting to the memory”, as mentioned above, the TA reports only a change in its location when moving from one memory to another. This is accomplished by performing a procedure called adjustment of the ZMU. The signs of lightning with arrows in figure 2 denote the TA, starting adjustment of ZMU. TA remains in the "connect to the memory" mode also after completing the adjustment of the memory, i.e. the next connection with the network occurs when the new boundary of the memory is crossed (for example, when the SL moves from the current memory to the new memory).

Figure 3 shows the various actions for adjusting the ZMU. Firstly, FIG. 3 shows TA1 performing adjustment of the ZMU when moving from ZMU ₁ to ZMU ₂ (the movement is indicated by arrow 3-1). Secondly, figure 3 shows that TA2 does not perform the correction of the memory despite the movement (as indicated by arrow 3-2) from the cell controlled by the controller 24 ₂ radio network (cattle), to the cell controlled by the controller 24 ₃ radio network (cattle) while both cells are inside the ZMU ₅ . In this regard, note that in FIG. 3, TA2 does not have a lightning bolt with an arrow. ZMU ₅ , as indicated above, is a ZMU with overlap. In this case, the OCRS (i.e., the radio network controller (RNC) 24 ₁ ) has no information that it is impossible to establish communication with TA2 through the radio network controller 24 ₂ (RNC). Thirdly, figure 3 shows that TA3 performs the adjustment of the ZMU when moving (as indicated by arrow 3-3) from ZMU ₅ to ZMU ₆ .

When the TAZ in figure 3 performs the adjustment of the ZMU, then it is transmitted to OCRS for TA3, i.e. to the controller 24 ₁ radio network (cattle). The procedure for transmitting the adjustment of ZMU to OCRS is presented in figure 4. Figure 4 shows the controller 24 ₃ radio network (RNC), sending a message 4-1 request for correction of the memory to OCRS (ie, the controller 24 ₁ radio network (RED)), and (in response) OCRS, sending back a response message 4 -2 adjustments to ZMU. Thus, figure 4 shows the signaling procedure of cattle-cattle to support the adjustment of the memory from another cattle (PCRS), where it was established a connection to the network by means of OCD.

Usually, as, for example, in the GPRS, clear boundaries of routing zones between base station controllers (RNCs) are defined to maintain low mobility in large radio access networks and to prevent routing zones from intersecting between BSCs. However, it is currently assumed that in the future routing zones may overlap between different cattle. In accordance with these proposals, in this regard, it is necessary, firstly, that each RNC store on an ongoing basis the address of the signaling network of all the RNCs in the radio access network (UNSR). As a second requirement of these proposals, the signaling network addresses must be mapped to the configuration of the ZMU of the radio access network (UNSR). These requirements are considered necessary in the sense of proposals, so that you can make a personal call TA within any memory in the radio access network.

However, the above suggestions mean that the RNC must store information regarding the configuration of the entire radio access network in relation to the memory and which one has at least one cell inside a specific memory. The proposals themselves, unfortunately, require detailed configuration information in each cattle, which, of course, means a lot of work to adjust as the radio access network develops.

The disadvantages of the above proposals are eliminated by the present invention. In accordance with the storage of information on cattle, the present invention requires that the cattle on a permanent basis store for all its memory only the address of the signaling network of cattle (1) of all other cattle that have at least one cell in this memory; and (2) any cattle that functions as a serving cattle for a connection for which the cattle functions as a passive cattle. Further, in accordance with the signaling aspects of the present invention, the cattle signaling network addresses (or abstract identifiers representing the signaling network addresses) of all cattle having at least one cell in the same memory from which the memory compensation was received are transmitted in signaling messages between the participating Cattle when necessary.

Thus, with respect to the address of the RNC stored for the present invention on an ongoing basis, the RNC must store for all its RAM only the address of the signaling network of the RNC of all other cattle that have at least one cell in this RAM. Of course, the RNC also needs to store the OCRS signaling address for the connection, for which the RNC acts as a passive RNC (RCC) in order to be able to transmit ZMU corrections to the OCRs when receiving the ZMU corrections from the TA participating in the connection.

In the situation shown in FIG. 2, for example, the use of the present invention has three consequences. The first consequence is that the controller 24 ₂ radio network (RNC) stores the address of the signaling network of the controller 24 ₃ radio network (RNC), since the controller 24 ₂ radio network (RNC) needs the address of the controller 24 ₃ radio network (RNC), since ZMU ₅ has the cells are also the controller 24 ₃ radio network (cattle). However, the 24 ₂ radio network controller (RNC) does not need to store the signaling network address of the 24 ₁ radio network controller (RNC) (since none of the RAMs of the 24 ₃ radio network controller (RNC) has a cell of the 24 ₁ radio network controller (RNC)). The second consequence is that the controller 24 ₃ radio network (RNC) stores the network address of the alarm controller 24 ₂ radio network (RNC) (the controller 24 ₃ radio network (RNC) needs it, since ZMU5 has cells of the controller 24 ₂ radio network (RNC)). As a third consequence, the 24 ₁ radio network controller (RNC) does not need to store the signaling network address of any other RNC (ZMU 1 and 2 exist only on the 24 ₁ radio network controller (RNC)).

With respect to the signaling aspects of the present invention, the RNC signaling network addresses (or abstract identifiers representing the signaling network addresses) of all RNCs having at least one cell in the same memory from which the memory adjustment was obtained are transmitted in signaling messages between participating RNCs when it's necessary. This allows you to support the personal call of the mobile station in any memory, where the mobile station has performed the adjustment of the memory, regardless of those cattle that have cells in this memory. This requires that the cattle signaling network addresses (or abstract identifiers representing the signaling network addresses) of all cattle having at least one cell in the same memory from which the correction of the memory is obtained be transmitted in signaling messages between participating cattle when necessary . One relevant event for this is the signaling procedure, by which the PCRS receives the ZMU adjustment request message from the mobile station and sends this message to the OCRS.

Figure 5 shows the situation in which the TA moves from the ZMU ₆ to the ZMU ₅ (as indicated by arrow 5-1), causing the need to adjust the ZMU. FIG. 6 shows a message flow for the procedure of FIG. 5, which includes both ZMU correction request message 6-2 sent from the PCRS (radio network controller ( ₃ ) 24) to OCRS (radio network controller 24 ₁ ); and a response message 6-2 adjustments ZMU sent from the controller 24 ₁ radio network (RNC) to the controller 24 ₃ radio network (RNC). In the sequence of FIG. 6, the PCRS sends the following information to the OCRS as the ZMU correction request message 6-2: (1) its own signaling network address (or an abstract identifier representing the signaling network address); and (2) an alarm network address (or an abstract identifier representing an alarm network address) _{of a} radio network controller 24 ₂ (RNC). It is necessary to transmit the address of the signaling network of the controller 24 ₂ radio networks (RNC), since the TA is now located in the memory, which includes cells of both the controller 24 ₃ radio networks (RNC) and the controller 24 ₂ radio networks (RNC). After receiving the information of the correction request message 6-2 of the ZMU RAM, the OCRS can (if necessary) make a personal TA call throughout the ZMU ₅ , including cell C _{2: 5} , controlled by the radio network controller 24 ₂ (RNC).

In the procedure of FIG. 7, the SLT moves from ZMU ₄ to ZMU ₃ (as indicated by arrow 7-1) and thus performs an adjustment to ZMU. In the message sequence of Fig. 8, in the message 8-1 of the correction request of the RAM of the PCRS (i.e., the radio network controller (KRS) 24 ₂ ) does not send the signaling network address (or an abstract identifier representing the signaling network address) of any other cattle to OCRS, since ZMU ₃ , in which the TA has moved, does not have cells of any other cattle. However, in message 8-1 of the correction request, ZMU PCRS still sends its own signaling network address (or an abstract identifier representing the signaling network address) to the OCRS (i.e., radio network controller 24 ₁ ). As a result of this procedure, the OCRS can make a personal call (if necessary) to the TA throughout the entire ZMU ₃ (completely at the controller 24 ₂ radio networks (KRS)).

One exemplary method for determining how a RNC that receives a ZMU correction request from a subscriber terminal device (TA) finds the address of a cattle signaling network that acts as a serving RNC for a subscriber terminal device (TA) is known from US Patent Application Serial Number 09 / 258151, filed February 26, 1999 and entitled "Method and apparatus for transmitting information between mobile terminals and objects in a radio access network", which is incorporated herein by reference. Other possible methods for locating a serving RNC signaling network (RNC) address are also within the scope of the present invention.

Thus, in accordance with the present invention, each radio network controller (RNC) 24 needs to store on a permanent basis only the addresses of the RNC signaling network (1) of all other RNCs that have at least one cell in this memory; and (2) any cattle that function as a serving cattle for a connection for which the cattle functions as a passive cattle. This means that each radio network controller does not need to store the addresses of all the radio network controllers throughout the topology of the radio access network 20.

In addition, the present invention favorably requires less support for operation and maintenance in order to maintain each RNC node with the correct correct "ZMU information" and the RNC signaling network addresses. Further, a personal call to a mobile station, operating in a specific memory, can be made with a cattle (RCC) having information about the location (CM) of the mobile station in the network, regardless of the cattle that has cells inside the memory. This personal call can be made even if some cells are controlled by cattle other than cattle receiving the latest adjustment of the memory (PCRS at the time of adjustment of the memory).

Although the invention has been described in connection with what is currently regarded as the most appropriate and preferred embodiment, it is understood that the invention is not limited to the described embodiment, but, on the contrary, is intended to cover various modifications and equivalent devices not coming out beyond the essence and scope of the claims of the following claims.

Claims (3)

1. A radio access network comprising a plurality of radio network controllers, including a first radio network controller that controls connections established over a radio interface, an alarm network that connects a plurality of radio network controllers, wherein a plurality of radio network controllers are arranged to establish one or more routing zones with overlapping, each zone overlapping routing includes a cell controlled by a first radio network controller and at least one cell controlled by another controller from a plurality of radio network controllers, in which the first radio network controller has storage means and, in which, for signaling through a signaling network, a request for establishing a routing zone, the first radio network controller must be stored in the storage medium the network addresses for: any of the many radio network controllers that controls a cell in any zone overlapping routing; and any of a plurality of radio network controllers that functions as a serving radio network controller for the connection, for which the first radio network controller functions as a passive radio network controller, wherein one of the many radio network controllers is a serving radio network controller that controls the connection between the core network and the subscriber terminal device, however, when the subscriber’s terminal device moves from the first routing zone to the second routing zone, the second routing zone This is the overlapping routing zone in which the second radio network controller also controls the cells, the first radio network controller sends a signaling message to the serving radio network controller, both (1) the address of the first radio network controller and (2) the address of the second radio network controller, thereby allowing the serving the radio network controller to make a personal call to the subscriber's terminal device throughout the routing area with overlap. 2. The radio network controller (24) for the radio access network (20), comprising storage means for storing addresses, means for a personal call, wherein the radio network controller uses, as a criterion for other radio network controllers, for storing the address: those other radio network controllers that control cells in the area (zones) routing (ZMU) with overlap, and the zone (zone) routing with overlap also has at least one cell controlled by the radio network controller; and those other radio network controllers that function as a serving radio network controller for the connection, for which the radio network controller functions as a passive radio network controller, while using the stored addresses, the paging tool makes a personal call to the subscriber terminal device anywhere in the routing area with the overlap served by the controller radio network, wherein when the radio network controller serves as a passive radio network controller, and in which, when the terminal device is the tape moves from the first routing zone to the second routing zone, the second routing zone is an overlapping routing zone, the radio network controller sends in a signal message to the serving radio network controller both (1) the address of the radio network controller and (2) the address of any other radio network controller having cells in the routing zone with overlapping, thereby allowing the serving radio network controller to make a personal call to the subscriber's terminal device throughout the overlapping routing zone. 3. A method of operating a radio access network through which multiple radio network controllers are provided, use a signaling network to connect multiple radio network controllers, use a first radio network controller to provide radio access via a radio interface for a connection controlled by a first radio network controller, provide one or more routing zones with overlapping, each overlapping routing zone contains a cell controlled by the first radio network controller and a cell controlled by another One of the many radio network controllers, according to which the first radio network controller is used to store the addresses of other radio network controllers in the radio access network to send a signaling to establish a routing zone over the network, to store network addresses in the storage device of the first radio network controller for: any of the many radio network controllers, which controls a cell in one or more overlapping routing zones; any of a plurality of radio network controllers that functions as a serving radio network controller for a connection, for which the first radio network controller functions as a passive radio network controller, wherein one of the plurality of radio network controllers is a serving radio network controller that controls a connection between a core network and a subscriber terminal device, to which, when the subscriber's terminal device moves from the first routing zone to the second routing zone, the second march zone utilization is an overlapping routing zone in which the second radio network controller also controls the cells, and the method also includes transmitting by the first radio network controller to the serving radio network controller a signal message of both (1) the address of the first radio network controller and (2) the address of the second radio network controller, thereby allowing the serving radio network controller to make a personal call to the subscriber's terminal device throughout the routing area with overlap.

Images