Abstract:
A method of configuration of an e-Node B device, on order to integrate the e-Node B device in a telecommunication network, comprising equipment mode, —establishing a communication link with the telecommunication network, —receiving configuration data, —self-configuring using the received data, and —entering an operational state, wherein the establishment of the communication link comprises transmitting a data element indicating that the establishment of the communication originates from an e-Node B behaving as a user equipment.

Description:
TECHNICAL FIELD 
       [0001]    The present invention relates to the installation of e-Node Bs in a Long Term Evolution (LIE) network. 
       BACKGROUND OF THE INVENTION 
       [0002]    The approaches described in this section could be pursued, but are not necessarily approaches that have been previously conceived or pursued. Therefore, unless otherwise indicated herein, the approaches described in this section are not prior art to the claims in this application and are not admitted to be prior art by inclusion in this section. 
         [0003]    The 3GPP Release 8 introduced the LTE (Long Term Evolution) that provides core network entities for supporting real-time voice and multimedia IP services. 
         [0004]    The self-configuration is defined as the process wherein the newly deployed e-Node Bs are configured by automatic installation procedures to get basic parameters and download necessary Software from the network. 
         [0005]    According to the 3GPP specifications and definition of experts, in a first step, the e-Node B gets an Internet Protocol (IP) address for communicating over the network. Then the e-Node B triggers a procedure in order to be associated with an access gateway. After that, the e-Node B downloads the required software and the operational parameters and sets up its interfaces with the network. Finally, the e-Node B configures the coverage and traffic capacity according to the downloaded information, and then enters in the operational state. 
         [0006]    With the increase of the use of e-Node Bs, there is a need for providing enhanced installation procedures in order to deploy efficiently the e-Node Bs in existing networks. 
       SUMMARY OF THE INVENTION 
       [0007]    The present invention provides a method enabling self-configuration of e-Node Bs to be integrated to a network. 
         [0008]    To that end there is provided, according to a first aspect of the invention, a method of configuration of an e-Node B device, in order to integrate the e-Node B device in a telecommunication network, comprising the following steps, performed by the e-Node B device:
       entering a user equipment mode, wherein the e-Node B device behaves like a user equipment of the telecommunication network,   establishing a communication link with a management entity of the telecommunication network,   receiving configuration data for a self-configuration of the e-Node B in order to enter an operational mode from the management entity of the telecommunication network, through the communication link,   self-configuring using the received data in order to provide a communication coverage area in the telecommunication network, and   entering an operational state wherein it offers to communication terminals of the telecommunication network a coverage area,
 
wherein the establishment of the communication link comprises transmitting a data element indicating that the establishment of the communication originates from an e-Node B behaving as a user equipment.
       
 
         [0014]    Thus, the e-Node B can perform itself its configuration without a dedicated backhaul to be needed. 
         [0015]    Since the communication link establishment is identified as originating from an e-Node B, the management entity of the network can prepare the transfer of the required data (Softaware, parameters . . . ). The management entity can also give priority to the communication from the e-Node B in order to accelerate its integration in the network. Thus the configuration process is optimized. 
         [0016]    This invention can be applied to the high layers of user equipment and operator network elements. 
         [0017]    According to other aspects of the invention, there is also provided:
       a computer program comprising instructions for executing a method according to the first aspect when the program is executed by a processor;   a computer program product for storing the computer program; and   devices for implementing a method according the first aspect.       
 
         [0021]    These objects provide at least the same advantages as those associated to the method. 
         [0022]    Other advantages are obtained by additional features which are recited in the dependent claims attached hereto. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0023]    Other features and advantages of the invention will become apparent from the following description of non-limiting exemplary embodiments, with reference to the appended drawings, in which: 
           [0024]      FIG. 1  is a schematic illustration of a context of implementation of embodiments of the invention; 
           [0025]      FIG. 2  illustrates an EPS attach type information element; 
           [0026]      FIG. 3  illustrates the exchanges between an e-Node B and a management entity of a network according to embodiments of the invention; 
           [0027]      FIG. 4  is a flowchart illustrating steps of a method according to embodiments of the invention; and 
           [0028]      FIG. 5  is a schematic illustration of a device according to embodiments of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0029]      FIG. 1  illustrates a context of implementation of embodiments of the invention. An e-Node B  10  is to be integrated in a communication network  11 . The e-Node B is to provide an additional coverage area or an enhanced coverage area to the network. However, the e-Node B as to be first configured in order to handle properly the communications over the network. In order to receive configuration parameters, the e-Node B can communicate with a management entity  12  of the network. 
         [0030]    The e-Node B starts in UE (User Equipment) mode. In the UE mode the e-Node B behaves like a normal mobile communication device on the network (the person skilled in the art may find indications concerning such a behaviour in documents 24.008, 24.301 and 36.331 of the 3GPP standard specification). It uses the same mechanisms as those used by mobile terminals for communicating over the network. In that mode, the e-Node B does not provide a communication coverage area. 
         [0031]    In the UE mode, the e-Node B obtains an IP address and downloads the required software (list of instructions) and the operational parameters using DHCP/BOOTP protocols in order to be configured for acting on the network as coverage area provider. 
         [0032]    Once the software and parameters received, the e-Node B sets up its communication interfaces, for example the X2/S1 interfaces. 
         [0033]    Then, the e-Node B configures the coverage and traffic capacity according to the downloaded information, and then enters in the operational state. 
         [0034]    In the UE mode, the e-Node B communications may be based on the principles used in GSM/UMTS configuration mode between BS/NB (Base Station/Node B) and BSC/RNC (Base Station Controller/Radio Network Controller), such as downloading transmission tables. 
         [0035]    In order to make a distinction between the e-Node B when it starts UE mode and a normal UE, the spare bit in the “EPS attach type” (described in section 9.9.3.11 of document TS 24.301 of the 3GPP specification) is used. 
         [0036]    The EPS attach type information element is illustrated in  FIG. 2 . 
         [0037]    The EPS attach type information element  20  comprises several bit groups, such as the EPS attach type IEI  21  and the EPS attach type value  22 . It has also a spare bit  23  that is not used in the prior art. According to embodiments, this bit is used to differentiate the communication requests from normal terminals and e-Node Bs in user equipment mode (for example the spare bit is 1 for an e-Node B and 0 for a terminal or inversely). 
         [0038]    For example, when the e-Node B acting as a UE transmits an EPS attach type information element with the spare bit set to 1 (the alternative may also be envisaged), the management entity of the network is informed that the establishment of a communication link is requested by an e-Node B. 
         [0039]    Thus, the management entity will handle this communication with a high level of priority (compared to conventional communications of User Equipments), and will trigger the preparation of the data needed by the e-Node B (the software and the other parameters). 
         [0040]      FIG. 3 , illustrates the exchange between an e-Node B  30  to be added and a management entity  31  of the network (for example an already integrated e-Node B of a Mobility Management Entity (MME)). 
         [0041]    The e-Node B enters an UE mode and performs a cell scan  300  for searching for available cell and frequencies. 
         [0042]    Once a cell is found, the e-Node B performs an RRC Connection Establishment  301 . The cause of the RRC connection can be for example “e-Node B configuration” as indicated by the transmission of the EPS attach type information element with the spare bit set to 1 (or 0 alternatively). 
         [0043]    The management entity thus recognizes that the connection request originates from an e-Node B that is self-configurating. 
         [0044]    The attachment process goes on during a step  302 . There is no RRC 
         [0045]    Connection Release after the end of the Attach procedure to maintain RRC in CONNECTED mode. 
         [0046]    Once the e-Node B is attached, the management entity issues a paging message during the RRC connection reconfiguration  303 . Then, the communication between the e-Node B acting as an UE and the management entity switches to a data transfer communication. 
         [0047]    The e-Node B then issues a service request  304  for starting the communication, then the management entity issues a service acceptation  305 . 
         [0048]    The EPS bearer context activation is then performed during a step  306 . 
         [0049]    Once the context activated, the e-Node B retrieves an IP address on the network and starts the download of the software and the configuration parameters, prepared by the management entity during a step  307 . 
         [0050]    Once the software and the parameters received. the e-Node B establishes its interfaces with the network, by setting up its X2/S1 interface during step  308 . Then, it self-configures in order to be integrated to the network as an e-Node B during step  309 . 
         [0051]    Once the self-configuration performed, the e-Node B enters an operational mode wherein it does not behave like a UE any longer and behaves like an e-Node B on the network, during a step  310 . 
         [0052]      FIG. 3  is a general flowchart that summarizes steps performed according to an embodiment. 
         [0053]    The e-Node B first enters an UE mode wherein it behaves like a User Equipment of the network during step S 400 . Then, the e-Node B downloads the parameters needed for its self-configuration during step S 401 . The e-Node B then self-configures for acting as an e-Node B on the network during step S 402 . Finally, the e-Node B enters an operational mode wherein it behaves like a normal e-Node B during step S 403 . 
         [0054]    A computer program comprising instructions for executing the steps of the method described above may be designed based on an algorithm derived from the general dataflows depicted in  FIGS. 3 and 4  and the present description. 
         [0055]    Referring to  FIG. 5 , an e-Node B device (respectively a management unit of the network)  50  according to the present invention is described. The device comprises a processing unit  51  configured for implementing a method according to embodiments of the invention. To that purpose, the device comprises a memory unit  52 . The memory unit may comprise several types of memory. For example, the memory unit may comprise a memory for storing processing data. The memory unit may also comprise a memory for storing a computer program according to embodiments of the invention. The device also comprises a communication unit  53  for performing communications over the network. 
         [0056]    While the invention has been illustrated and described in details in the drawings and foregoing description, such illustration and description are to be considered illustrative and exemplary only, the invention being not restricted to the disclosed embodiments. Other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed invention, from a study of the drawings, the disclosure and the appended claims. 
         [0057]    In the claims, the word “comprising” does not exclude other elements or steps, and the indefinite article “a” or “an” does not exclude a plurality. A single processor or other unit may fulfil the functions of several items recited in the claims. The mere fact that different features are recited in mutually different dependent claims does not indicate that a combination of these features cannot be advantageously used. Any reference signs in the claims should not be construed as limiting the scope of the invention.