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    • 专利摘要:
    CONFIGURATION RELAY CELL IDENTITY IN CELLULAR NETWORKS. The technology in this application identifies a relay cell serviced by a radio relay node (12, 44, 60) in a radio access network (RAN) (40) of a cellular communications system where there is a radio connection between the relay radio node and a donor base station (14, 42, 70). The donor base station is identified by a RAN base station cell identifier. a RAN relay cell identifier is determined to uniquely identify the relay cell in the RAN, the RAN relay cell identifier includes a relay cell identifier and a donor base station identifier. The RAN relay cell identifier is then provided or used as needed so that the relay radio node can transmit the RAN relay cell identifier to uniquely identify the relay cell at one or more radio terminals in the RAN .
    公开号:BR112012025070B1
    申请号:R112012025070-1
    申请日:2011-01-26
    公开日:2022-02-15
    发明作者:Fredrik Gunnarsson；Gunnar Mildh；Walter Müller；Ingrid Nordstrand
    申请人:Telefonaktiebolaget Lm Ericsson (Publ)；
    IPC主号:
    专利说明:

    FIELD OF TECHNIQUE
    [001] The field of technique refers to communication networks that include relay nodes for relay communications between a donor base station and one or more user radio terminals and, more particularly, to methods and apparatus for identifying nodes. of relay. FUNDAMENTALS
    [002] Advanced LTE (Long Term Evolution) cellular radio communications is standardized on 3GPP (3rd Generation Partnership Project). A general diagram of LTE that can be interfaced with other networks is shown in Figure 1.
    [003] The exponential growth in demand for radio or “wireless” data communications has put enormous pressure on cellular network operators to improve the capacity of their communication networks. Relay nodes can improve the coverage and capacity of radio communications networks. A relay node may be positioned between a radio base station and a mobile radio user terminal so that transmissions between such a base station, referred to herein as the relay "donor" base station, and the user terminal, are relayed. by the relay node.
    [004] LTE systems, e.g. 3GPP LTE Rel-10, can support Type 1 relay nodes, which appear to the user terminal (referred to in LTE as a user equipment (UE)) as a separate base station distinct from the donor base station. A base station is referred to as an enhanced NodeB (eNB) and a donor base station as a DeNB in LTE. Service areas covered by Type 1 relay nodes, each serving one or several relay cells, referred to as relay cells, also appear to a user terminal as separate cells distinct from the cells of the donor base station. The relay cells controlled by the relay nodes include their own Physical Cell ID (as defined in LTE Rel-8), and the relay node transmits a sync channel, a reference symbol, etc. for each relay cell served. In the context of single cell operation, the user terminal receives Hybrid Automatic Repeat Request (HARQ) scheduling and feedback information directly from the relay node and sends control information such as service requests (SRs), channel quality (CQIs), and acknowledgments (ACKs) to the relay node. A Type 1 relay node is backwards compatible and looks like a base station for LTE Release 8 user terminals. Thus, from a user terminal's perspective, there is no difference being served by a base station or a Type 1 relay node.
    [005] Transmissions between the relay node and the donor base station are through a radio interface called the Un interface in LTE. The Un interface, sometimes also referred to as the backhaul link, provides backhaul transport for data transferred between the relay node and user terminals connected to the relay node, and the core network. The LTE Rel-10 standard specifies radio protocols for the backhaul link. Transmissions between user terminal and relay node are over a radio interface called the Uu interface in LTE, which is also referred to as an access link. The radio protocols for the access link are the same in LTE and for direct radio communication between the user terminal and a base station (e.g. donor base station) without a relay node being located between them.
    [006] The relay node comprises two main parts: a user terminal part for communicating with the donor base station through the Un interface and a base station part for communicating with user terminals through the Uu interface. The user terminal part operates the same as a normal user terminal. In this way, normal user terminal access procedures and methods are employed in the Un interface to establish connections between the relay node and the donor base station. These access procedures are described in 3GPP TR36.806, “Evolved Universal Terrestrial Radio Access Network (E-UTRA); Relay Architecture for E-UTRA (LTE-Advanced) (Release 9).
    [007] When a relay node is pinned to the LTE network, it can optionally reuse the LTE user terminal (UE) “pinning” procedure to establish Internet Protocol (IP) connectivity to the core network. Once the attachment procedure is complete, the relay node contacts an Operations and Maintenance (O&M) system or other network node in the core network to become active as a base station.
    [008] The UE pinning procedure in LTE is designed so that the eNB does not need to know unique UE identifiers, e.g. IMSI, IMEI, etc. Only the core network (the Evolved Packet Core (EPC) that includes the Mobility Management Entity (MME) in LTE) is typically aware of these globally unique UE identifiers. The eNB is aware of local identifiers of the UE-specific Radio Resource Control (RRC) connection between the UE and eNB (identified by a Cell Radio Network Temporary Identifier (C-RNTI)) and the specific S1 connection of UE between the eNB and the MME (identified by MME UE S1AP ID and eNB UE S1AP ID). In addition, temporary identifiers are assigned (such as the Temporary Globally Unique ID (GUTI) that identifies the MME and the temporary mobile subscriber identifier (TMSI) that identifies the UE within the MME) in order to avoid, in many cases, the need to in transmitting unique UE identifiers (e.g. IMSI, IMEI) over a radio interface and via the eNB.
    [009] In addition to the identities described above, each E-UTRAN cell broadcasts a Public Land Mobile Network (PLMN) identity, (or several in a PLMN Identity List), a cell-unique 28-bit cell identity within the context of a PLMN, and a Physical Cell Identity (PCI). The PCI is mapped to broadcast beacons in the cell that the UE uses for cell lookup and cell identification. The number of available PCIs is limited by frequency layer, which means that the PCIs need to be reused. Ideally, however, PCIs are perceived as locally unique per frequency layer so that a UE can identify handover candidate cells in metering reports by their corresponding broadcast PCIs. The combination of PLMN (the first PLMN in the case of a list) and the 28-bit cell identity that uniquely identifies the cell within the scope of the PLMN is denoted by the Evolved Cell Global Identifier (ECGI). This unique cell identifier ECGI can be used to look up candidate cell connectivity information that results in functionality commonly referred to as Automatic Neighborhood Relations (ANR).
    [0010] One problem is how to determine and adjust the initial ECGIs of Relay Node (RN) cells. One possible solution is to set the ECGIs of relay node cells to a value that is independent of the donor base station identifier, e.g. a DeNB ID, and instead use a dedicated eNB ID for the node. of relay. However, a disadvantage of this solution is that the relationship that exists between the relay node and its DeNB cannot therefore be derived from the ECGIs of the relay node cells. For example, considering a situation where a first cell served by a first eNB is a neighbor cell of a second cell served by a second eNB, the second eNB is also a DeNB for a relay node, and there is no neighbor relationship between any of the relay node cells and the first cell. A UE served by the first cell detects one of the relay node cells and reports to the first cell the PCI and then the ECGI of the relay node cell. However, the first eNB serving the first cell does not recognize and cannot readily determine that the RN is served by the second eNB (a neighbor of the first eNB) to which the first eNB has already established connectivity. To handle this situation, the MME needs to maintain the path of relay node connectivity, which requires significant effort due to the number of relay nodes deployed which can exceed the number of eNBs deployed by an order of magnitude. This results in inefficient relay node handling.
    [0011] A similar problem exists when the core network (MME) wants to reach a specific relay node under a donor eNB. S1 messages are routed based on the eNB ID. Therefore, for dedicated relay node eNB IDs, the MME must keep track of all relay node eNB IDs. Furthermore, WO2009/077418 describes a method for assigning an identifier to a relay node.
    [0012] Another issue with using a fixed ECGI for each relay node cell is in dynamic situations where radio conditions, mobility, etc. are changed. In a changed situation, another eNB might be a more favorable eNB to serve the relay node than your current DeNB. As a result, the relay node may need to be relocated to a new DeNB that has a different eNB ID than the old DeNB. The MME's routing information about the relocated RN then needs to be updated on each RN relocation that requires extensive reconfiguration efforts.
    [0013] A better way of determining a relay cell identity is therefore needed that overcomes the problems and drawbacks identified above. SUMMARY
    [0014] The technology in this application identifies a relay cell served by a relay radio node in a radio access network (RAN) of a cellular communications system where there is a radio connection between the relay radio node and a donor base station. The donor base station is identified by a RAN donor base station cell identifier. A RAN relay cell identifier is determined so that it uniquely identifies the relay cell within the RAN, the RAN relay cell identifier includes a relay cell identifier and a donor base station identifier. The RAN relay cell identifier is then provided or used as needed so that the relay radio node can transmit the RAN relay cell identifier to uniquely identify the relay cell at one or more radio terminals in the RAN
    [0015] A first aspect includes a method for identifying a relay cell served by a relay radio node in a radio access network (RAN) of a cellular communications system in which there is a radio connection between the relay node. relay radio and a donor base station. The RAN donor base station is identified by a donor base station cell identifier. A RAN relay cell identifier is determined by uniquely identifying the relay cell within the RAN, the RAN relay cell identifier includes a relay cell identifier and the donor base station identifier. The RAN relay cell identifier is provided or used so that the relay radio node can transmit the RAN relay cell identifier to uniquely identify the relay cell to one or more radio terminals in the RAN.
    [0016] A change from the donor base station to the relay radio node on a different donor base station may be detected, and the RAN relay cell identifier changed to include a different donor base station identifier associated with the donor base station different.
    [0017] Information destined for the relay node is routed in a cellular communications system core network using the donor base station identifier and the donor base station routes information to the relay node based on the relay cell identifier.
    [0018] In an exemplary implementation, the relay cell can be treated as a virtual cell of the donor base station.
    [0019] In an exemplary embodiment, the cellular communications system is based on LTE, the donor base station is a donor eNB, and the RAN relay cell identifier is an E-UTRAN relay cell global identifier that includes a PLMN identifier, a donor eNB E-UTRAN identifier, and a cell identifier. In this case, the radio connection between the relay radio node and an initial donor base station to the relay radio node can be established using a fastening procedure.
    [0020] In an example implementation, the method is implemented in an operations and maintenance (O&M) node. In one variation, the relay node may signal the donor base station identifier to an operations and maintenance (O&M) node. In addition, the operations and maintenance (O&M) node can maintain a list of relay cell identifiers allocated to each donor base station.
    [0021] In another exemplary implementation, the method is implemented at the relay radio node and the relay node signals the RAN relay cell identifier to the donor base station.
    [0022] A second aspect includes an operations and maintenance (O&M) node for use in configuring or reconfiguring an identity of a relay cell served by a radio relay node in a radio access network (RAN) of a cellular communications system wherein there is a radio connection between the relay radio node and a donor base station, wherein the donor base station is identified by a RAN donor base station cell identifier. The electronic circuitry is configured to determine a RAN relay cell identifier that uniquely identifies the relay cell within the RAN, the RAN relay cell identifier includes a relay cell identifier and the donor base station identifier . The communications circuitry is configured to provide the RAN relay cell identifier to the relay radio node so that the relay radio node can transmit the RAN relay cell identifier to uniquely identify the relay cell to one or more radio terminals on the RAN.
    [0023] In an exemplary embodiment, the cellular communications system is based on LTE, the donor base station is a donor eNB, and the RAN relay cell identifier is an E-UTRAN relay cell global identifier that includes a PLMN identifier, a donor eNB E-UTRAN identifier, and a cell identifier.
    [0024] Other possible exemplary implementation features include the communications circuitry that receives the donor base station identifier from the relay node and/or the electronics circuitry that maintains a list of relay cell identifiers allocated to each donor base station.
    [0025] A third aspect includes a relay node apparatus for use in a radio access network (RAN) of a cellular communications system wherein there is a radio connection between the relay radio node and a radio base station. donor base station, wherein the donor base station is identified by a RAN donor base station cell identifier. The radio circuitry is configured to communicate over the air with the donor base station and with one or more user radio terminals. The electronic circuitry is configured to determine a RAN relay cell identifier that uniquely identifies a relay cell within the RAN served by the relay node, the RAN relay cell identifier includes a relay cell identifier and the donor base station identifier. The radio circuitry is configured to transmit the RAN relay cell identifier to uniquely identify the relay cell at one or more user radio terminals in the RAN. Again, the cellular communications system may be based on LTE, the donor base station, a donor eNB, and the RAN relay cell identifier, where an E-UTRAN global relay cell identifier includes a PLMN identifier , a donor eNB E-UTRAN identifier, and a cell identifier. Alternatively, the relay node may transmit the RAN relay identifier to the donor base station.
    [0026] In an exemplary implementation, the relay node electronics circuitry is configured to determine the RAN relay cell identifier by receiving the RAN relay cell identifier from an operations and maintenance node. Alternatively, the relay node electronics circuitry is configured to determine the RAN relay cell identifier by receiving the RAN relay cell identifier from the donor base station. Another variation may be for the relay node electronics circuitry to calculate the RAN relay cell identifier.
    [0027] A fourth aspect includes apparatus for a donor base station associated with a radio access network (RAN) donor base station identifier and configured for a radio connection with a relay radio node. The apparatus includes electronic circuitry configured to determine a RAN relay cell identifier that uniquely identifies the relay cell within the RAN, the RAN relay cell identifier includes a relay cell identifier and a base station identifier RAN donor. The routing circuitry is configured to use the RAN relay cell identifier routing data for the relay radio node. Again, an exemplary implementation might be in an LTE-based cellular communications system where the donor base station is a donor eNB, and the RAN relay cell identifier is an E-UTRAN relay cell global identifier that includes a PLMN identifier, a donor eNB E-UTRAN identifier, and a cell identifier. In an exemplary order, the donor base station is associated with multiple different relay cells, and the routing circuitry is configured to determine which relay cell for routing information based on the relay cell identifier associated with the information to be transmitted. be routed.
    [0028] A fifth aspect also includes apparatus for a donor radio base station associated with a radio access network (RAN) donor base station identifier and configured for a radio connection with a relay radio node. In that case, the electronic circuitry receives from the relay node a RAN relay cell identifier that uniquely identifies the relay cell within the RAN. The RAN relay cell identifier includes a relay cell identifier and a RAN donor base station identifier. The routing circuitry uses the RAN relay cell identifier routing data for the relay radio node. BRIEF DESCRIPTION OF THE DRAWINGS
    [0029] Figure 1 illustrates a non-limiting example of a conventional LTE system so that it can interface with other networks; Figure 2 is a non-limiting example functional block diagram of a cellular radio communications system that includes a node Figure 3 is a flowchart of exemplary non-limiting procedures for determining, adjusting, and if necessary changing a RAN relay cell identifier; Figure 4 illustrates a diagram of non-limiting example RAN relay cell identifiers ; Figure 5 is a non-limiting exemplary functional block diagram of an LTE-based cellular radio communications system that includes a relay node; retransmission in an LTE-based cellular radio communications system; Figure 7 illustrates a diagram of exemplary non-limiting RAN relay cell identifiers for use in an LTE-based cellular radio communications system; Figure 8 illustrates a diagram non-limiting example signaling diagram related to the configuration of a relay node in an LTE-based cellular radio communications system according to a first non-limiting embodiment; Figure 9 illustrates an exemplary non-limiting signaling diagram related to the configuration of a node relay on an LTE-based cellular radio communications system according to with a second non-limiting embodiment; Figure 10 illustrates an exemplary non-limiting signaling diagram related to the configuration of a relay node in an LTE-based cellular radio communications system in accordance with a third non-limiting embodiment; Figure 11 is a simplified, non-limiting exemplary functional block diagram of an O&M node that can be used in configuring a relay node; Figure 12 is a simplified, non-limiting exemplary functional block diagram of a relay node; and Figure 13 is a simplified, non-limiting exemplary functional block diagram of a donor base station node that can be used in configuring a relay node. DETAILED DESCRIPTION
    [0030] In the following description, for purposes of explanation and not limitation, specific details are presented, such as particular nodes, functional entities, techniques, protocols, standards, etc. in order to provide an understanding of the described technology. It will be apparent to those skilled in the art that other modalities may be practiced outside of the specific details described below. In other examples, detailed descriptions of methods, devices, techniques, etc. well known are omitted so as not to confuse the description with unnecessary details. Individual function blocks are shown in the figures. Those skilled in the art will appreciate that the functions of such blocks can be implemented using individual hardware circuits, using software programs and data in conjunction with a properly programmed microprocessor or general purpose computer, using application-specific integrated circuit (ASIC), and /or using one or more digital signal processors (DSPs). Software program instructions and data may be stored on computer-readable storage media, and when the instructions are executed by a computer or other suitable processor control, the computer or processor performs the functions.
    [0031] Thus, for example, it will be appreciated by those skilled in the art that diagrams in the present document may represent conceptual views of illustrative circuitry or other functional units. Similarly, it will be appreciated that any flowcharts, state transition diagrams, pseudocode, and the like represent various processes that can be substantially represented in computer-readable medium and then executed by a computer or processor, whether or not such computer or processor is explicitly shown.
    [0032] The functions of the various elements illustrated can be provided through the use of hardware such as circuit hardware and/or hardware that can execute software in the form of coded instructions stored on a computer readable medium. Thus, such illustrated functions and function blocks should be understood to be either hardware-deployed and/or computer-deployed, and then machine-deployed.
    [0033] In terms of hardware implementation, function blocks may include or encompass, without limitation, digital signal processor (DSP) hardware, reduced instruction set processor, hardware circuitry (e.g. digital or analog ) that include, but are not limited to, application-specific integrated circuit(s) (ASIC) and/or field-programmable gate array(s) (FPGA(s)), and (where appropriate) state machines that can perform such functions.
    [0034] In terms of computer implementation, a computer is generally understood to comprise one or more processors or one or more controllers, and the terms computer, processor, and controller may be used interchangeably. When provided by a computer, processor, or controller, functions may be provided by a single computer or dedicated processor or controller, by a single computer or shared processor or controller, or by a plurality of individual computers or processors or controllers, some of which which can be shared or distributed. In addition, the term “processor” or “controller” also refers to other hardware that can perform such functions and/or run software, such as the exemplary hardware cited above.
    [0035] Figure 2 is a non-limiting exemplary functional block diagram of the cellular radio communications system that includes a relay node. A user terminal 10 located at or near a relay cell area served by a relay node 12 communicates via a radio interface with the relay node 12 which communicates with a donor base station 14 also via a radio interface. The donor base station 14 communicates with one or more network nodes 16 and an operations & maintenance (O&M) type node 18 either directly or through one or more other nodes as represented in the Figure by dotted lines. After relay node 12 is powered up and secured to the radio access network (RAN), of which donor base station 14 is a part, relay node 12 is configured for operation as a relay node. Part of the relay node configuration is determining and setting a RAN relay cell identifier that uniquely identifies the relay node cell in the RAN based on the base station identifier of its donor base station 14 and a cell identifier relay that is not necessarily unique in the RAN. (The relay node can have more than one cell, but for simplicity of description, only one cell is described in the example). As a result, the core network can easily send packets to relay node 12 simply by routing such packets to donor base station 14 using the donor base station identifier. Once the donor base station receives the packet, it routes the packet to relay node 12 using either the relay node cell identifier or the full RAN relay node cell identifier. The relay node cell identifier informs the donor base station where the packet is for a cell served by an associated relay node, and if the donor base station is associated with more than one relay node, such relay node must receive the package.
    [0036] Figure 3 is a flowchart of exemplary non-limiting procedures for determining, adjusting, and if necessary changing a RAN relay cell identifier. First, basic radio connectivity is established with the relay node and the RAN, for example through its initial donor base station. After connectivity is established, a RAN relay cell identifier is determined for each cell served by the relay node which uniquely identifies the relay cell within the RAN, the RAN relay cell identifier includes a relay cell identifier and a donor base station identifier (step S1). Then, the RAN relay cell identifier is provided as necessary so that the relay radio node can transmit the RAN relay cell identifier to uniquely identify the relay cell at one or more radio terminals in the RAN ( step S2). Exemplary variant embodiments describe below how such a provision may be fulfilled. A decision is made in step S3 whether the donor BS for the relay node has been or will be recently changed. If yes, a new RAN relay cell identifier is determined based on a new donor base station identifier (step S4). Steps S3 and S4 allow the RAN relay cell identifier to be adapted to changes in the network, communication conditions, etc.
    [0037] Figure 4 illustrates a diagram of exemplary non-limiting RAN relay cell identifiers. A first is a RAN relay cell identifier that includes a relay cell cell identifier (this cell identifier may or may not be unique within the RAN) and a current donor base station identifier that is unique within the RAN. . As a result, the RAN relay cell identifier is also unique within the RAN. A RAN Relay Global Cell Identifier may be formed by appending a network operator or Public Land Mobile Network (PLMN) identifier to the RAN Relay Cell Identifier.
    [0038] Figure 5 is a non-limiting exemplary functional block diagram of an LTE-based cellular radio communications system that includes a relay node. Of course, the principles described with respect to an LTE-based implementation can also be applied to networks based on other communication standards now known or later developed.
    [0039] Core network 20 and radio access network (RAN) 40 are shown divided by a dashed line. The core network 20 is responsible for overall control of the user terminal or UE 46 and for establishing carriers between the UE 46 and one or more external networks, such as the Internet or other packet data networks (PDNs). The main logical components of the LTE core network 20 comprise the Packet Data Network Gateway (PDN-GW) 22, the Gateway Server (SGW) 24, the Mobility Management Entity (MME) 26, and the Subscriber Server. Home (HSS) 28. In addition to these nodes, the core network 20 may include other logical nodes, such as an operations and management system (O&M) node 27. Alternatively, an O&M node may be separate from the core network 20, which is the case, for example, with LTE. The PDN-GW 22 provides connection to one or more external packet data networks and is responsible for assigning IP addresses to user terminals. The SGW 24 serves as a mobility anchor point for the user terminal so that all packets transferred between the user terminal 46 and a packet data network pass through the SGW 24. The MME control node 26 is responsible for mobility management, connection management, and conveyor management. The HSS 28 stores subscriber information as well as the current locations of the user terminals 46. The MME 26 communicates with the HSS 28 when the user terminals 46 are attached to the network to authenticate and authorize the user terminals 46.
    [0040] The Radio Access Network (RAN) 40 comprises a network of base stations 42 called Evolved Node Bs (eNBs) that communicate via the Radio Interface with user terminals. The RAN is sometimes referred to as an Evolved UMTS Terrestrial RAN (E-UTRAN). Base stations 42 provide radio coverage in respective cells 12 of communication network 10. Although only one base station 42 is shown, a typical RAN 40 comprises many base stations 42.
    [0041] The eNB 42 can communicate with user terminals 46 through relay nodes 44. In this case, the eNB 42 is referred to as a donor eNB (DeNB). Relay node 44 relays signals between DeNB 42 and one or more user terminals 46 at or near one or several relay cell(s) associated with relay node 44. For downlink communications, relay node 44 receives signals from the DeNB 42 via a U interface and transmits signals to user terminals 46 over a Uu interface. For uplink communications, relay node 44 receives signals from user terminals 46 through a Uu interface and transmits signals to DeNB 42 through a U interface. The relay node 44 may use the same or different frequencies at the interface of Un and Uu.
    [0042] When a relay node 44 is deployed, the relay node 44 is attached to the core network 20 and configuration information is downloaded from a network node in the O&M system. As mentioned in the fundamentals, the attachment procedure is designed so that the base station 42 does not need to know the unique identifiers, such as the International Mobile Subscriber Identity (IMSI) and International Mobile Equipment Identification (IMEI), of the relay node 44. .
    [0043] Figure 6 illustrates an exemplary non-limiting signaling diagram related to the attachment and configuration of a relay node in an LTE-based cellular radio communications system. The relay node 44 initially establishes a radio resource control (RRC) connection with a DeNB 42 (step a). In this step, the relay node may or may not be identified by itself as a relay node to the DeNB 42. Once the RRC connection is established, the relay node 44 performs a fastening procedure with the MME 26 in the core network 20 (step b). During the fixation procedure, the MME 26 obtains signature data from the HSS 28, configures default carriers with the SGW 24 and PDN-GW 22 to carry user traffic (step c), and performs a context configuration procedure for establish a section for the mobile terminal (step d). After the context configuration procedure, the DeNB 42 reconfigures the Radio Resource Control (RRC) connection (step e). When the RRC connection is reconfigured, user flat IP connectivity goes out, and relay node 44 can send data to DeNB 42, which is forwarded by DeNB 42 to SGW 24/PDN-GW 22.
    [0044] After the relay node fixing procedure, the relay node 44 can download the configuration information from the O&M system (or other network node) (step f). The relay node 44 can upload the information about the base station identifier from the DeNB 42. If the relay node identified itself as a relay in step a, then a RAN relay cell identifier is determined and provided. or used for each relay cell so that the relay node can broadcast the same to the UEs in or near its relay cell. In addition, the RAN relay cell identifier will be used by the core network and the DeNB performs routing of data packets and signaling messages to the relay node 44. The relay node 44 can use the configuration information to configure the interfaces. S1 and X2 (steps g, h) with the DeNB 42. In step h, the DeNB preferably performs an X2 configuration of RN initiated with one or more neighboring eNBs. Consequently, relay node 44 begins to operate as a relay. Additionally, the DeNB 42 can use relay node configuration information for fault and performance management and other management functions.
    [0045] If the relay node does not identify itself as a relay node in step a, then it can still download configuration information from the O&M system. This information may comprise for each relay cell, a list of assigned RAN relay cell identifiers, one for each possible DeNB. Also, in this case, the relay node does not perform steps g and h. On the contrary, the relay node will be detached as a UE, and possibly it is reattached, at that time, identifying itself as a relay node in step a.
    [0046] Figure 7 illustrates a diagram of exemplary non-limiting RAN relay cell identifiers for use in an LTE based system such as those described in Figures 5 and 6. A first is an E-UTRAN relay cell identifier which includes a cell identifier of the relay cell (this cell identifier may or may not be unique within the RAN) and a current DeNB identifier that is unique within the E-UTRAN. As a result, the E-UTRAN relay cell identifier is also unique within the E-UTRAN. An E-UTRAN relay global cell identifier may be formed by attaching a network operator or Public Land Mobile Network (PLMN) identifier to the RAN relay cell identifier. Relay node broadcasting of its E-UTRAN relay cell identifier close to UEs allows other eNBs to derive DeNB IDs from information reported by a UE.
    [0047] The cell identifier part can be derived from the C-RNTI of the relay node or some other parameter assigned to the relay node (eg GUTI, security key, etc). Alternatively, the cell identifier portion may be taken from a dedicated sub-range of an entire cell identifier range, for example, by reserving a dedicated sub-range by the relay node provider. It can also be retrieved from memory, as the cell identifier of the relay node cell had at an earlier time when the relay node was served by the same DeNB. Another option is to select the cell identifier part based on neighboring information from DeNB to derive a list of occupied ECGIs, that is, the ECGI used by other served RN cells, to select a vacant cell identifier.
    [0048] Similar to the procedures outlined for Figure 3, an RN relay node is associated with a donor eNB (DeNB) either in its first feed and hold procedure or as a result of handover from a different DeNB. If the DeNB ID portion of the E-UTRAN relay cell identifier does not match the current DeNB eNB ID for the relay node, then the E-UTRAN relay cell identifier is changed to include the E-UTRAN relay cell ID. DeNB of the current DeNB while the relay cell identifier remains the same. Alternatively, the entire E-UTRAN relay cell identifier is changed, wherein the DeNB ID part is changed to the current DeNB ID.
    [0049] In a non-limiting embodiment, the RAN relay cell identifier is determined and stored in relay node 44 and transported to DeNB 42, O&M node, and/or MME 26 during the relay node attachment procedure . The RAN relay cell identifier may be carried directly to the donor base station 42 via RRC signaling or as part of S1 Request Part (S1-AP) signaling or X2 Request Part (X2-AP) signaling. . Alternatively, the RAN relay cell identifier may initially be carried to the MME 26 as non-access stratum (NAS) signaling. The MME 26 may then carry the RAN relay cell identifier to the DeNB 42 during S1-AP context configuration. The RAN relay cell identifier may also be sent and stored by the HSS 28. In all scenarios, the RAN relay cell identifier may be transported securely using encryption and/or integrity protection.
    [0050] Figure 8 illustrates an exemplary non-limiting signaling diagram related to the relay node (RN) configuration in an LTE-based cellular radio communications system according to a first non-limiting embodiment. After the relay node is powered and a connection is established with the DeNB and core network (e.g. SGW/MME), the relay node sends an O&M Configuration Request Message to the O&M node via the DeNB directly or additionally through the SGN/MME. The O&M Setup Request message includes information regarding the DeNB base station identifier, for example, the DeNB eNB ID. The O&M determines and signals an E-UTRAN Relay Cell Global Identifier (ERCGI) to the relay node based on knowledge in the O&M system to which the relay node's DeNB is currently connected (this can be provided by the relay node). relay or by DeNB). The O&M system can also inform the DeNB of the ERCGIs assigned to the relay node cells. An alternative is that the relay node informs the DeNB about ERCGIs of served cells. Once the relay node is configured, it broadcasts the ERCGI in its relay cell for detection by UEs that are close to or in the cell.
    [0051] Figure 9 illustrates an exemplary non-limiting signaling diagram related to the configuration of a relay node in an LTE-based cellular radio communications system according to a second non-limiting embodiment. After the relay node is powered up and a connection is established with the DeNB and core network (e.g. SGW/MME), the DeNB knows that the relay node is a relay node, and thus the relay node also knows the DeNB base station identifier. The relay node's DeNB selects and signals to the relay node a new EUTRAN Relay Cell Global Identifier (ERCGI), for example, using RRC, X2, S1, O&M, or some other signaling. Alternatively, because the relay node also knows the base station identifier of the DeNB, the DeNB selects and signals to the relay node only a relay cell identifier, and the relay node combines the selected relay cell identifier with the DeNB base station identifier to compile a new EUTRAN relay cell identifier. The relay node signals the assigned ERCGIs or relay cell identifiers to the O&M system. Once the relay node is configured, it broadcasts the ERCGI in its relay cell for detection by UEs that are close to or in the cell.
    [0052] Figure 10 illustrates an exemplary non-limiting signaling diagram related to the configuration of a relay node in an LTE-based cellular radio communications system according to a third non-limiting embodiment. After the relay node is powered up and a connection is established with the DeNB and core network (e.g. SGW/MME), the relay node adjusts and/or changes its E-UTRAN Relay Cell Global Identifier (ERCGI) of each relay cell served based on information about the DeNB's eNB ID. The relay node signals the new ERCGI to its DeNB and the neighboring cells of the relay node cell (not shown). DeNB recognizes the received ERCGI.
    [0053] In another exemplary embodiment, the relay node can change its ERCGI based on information about the DeNB identifier and/or some other signaling parameter that is configured by the DeNB (for example, the C-RNTI). Furthermore, the DeNB can advantageously derive the ERCGI of the relay node by combining the base station identifier of DeNB and a relay cell identifier derived from the assigned parameter (e.g. C-RNTI). A benefit with this mode is that the relay node does not need to inform the DeNB of its ERCGI, thus conserving radio and other resources.
    [0054] Figure 11 is a simplified, non-limiting exemplary functional block diagram of an O&M node 50 that can be used in configuration and/or communication with a relay node. The O&M node 50 includes electronic circuitry 52 that is configured to determine and store RAN relay cell identifiers as described above. The RAN relay cell identifiers 54 may be stored in memory. The O&M node 50 may also store a configured range of relay cell identifiers 56, of which the relay node cells are assigned relay cell identifiers. In addition, the O&M node 50 may also store information about assigned relay cell identifiers and used cell identifiers from each DeNB to allow derivation of vacant relay cell identifiers given an eNB ID of DeNB. Electronic circuitry 52 is connected to communications circuitry 58 which allows electronic circuitry 52 to communicate with other network nodes. The O&M node electronic circuitry may also be configured to perform other O&M system functions, or such other functions may be performed by other circuitry.
    [0055] Figure 12 is a simplified, non-limiting exemplary functional block diagram of a relay node 60. Relay node 60 comprises radio circuitry 62 coupled to one or more antennas 63 which may include a first transceiver for communication with the donor base station and other network nodes (eg an O&M node) through the Un interface and a second transceiver for communication with user terminals through the Uu interface. Alternatively, the same transceiver can be used for communications with both the Uu and Un interfaces. Radio circuitry 62 is connected to electronic circuitry 64 configured to perform related operations for self-determination or reception from another node of its RAN relay cell identifier and to broadcast the RAN relay cell identifier. RAN using radio circuitry 62 and antenna(s) 63.
    [0056] Figure 13 is a simplified, non-limiting exemplary functional block diagram of a donor base station node 70 that may be used in configuration and/or communication with a relay node. Donor base station node 70 comprises radio circuitry 72 coupled to one or more antennas 73 which may include a first transceiver for communicating with one or more relay nodes via the Un interface and a second transceiver for communicating with the terminals. user interface through the Uu interface. Alternatively, the same transceiver can be used for communications on both the Uu and Un interfaces. Radio circuitry 72 is connected to electronic circuitry 74 configured to perform related operations for self-determination or by receiving from another node one or more RAN relay cell identifiers of relay nodes that are served by the station base. Electronic circuitry 74 is connected to communications circuitry 76 which allows electronic circuitry 74 to communicate with other network nodes such as one or more other base stations, core network nodes, and an O&M node.
    [0057] The technology described in this application offers several advantages. It allows efficient and flexible determination and adjustment of the initial RAN relay cell identifier. The core network can easily route data packets and messages to a relay node simply by sending such packets to the relay donor base station identifier. As a result, the core network does not need to generate and maintain paths from base station identifiers to relay nodes which are much more efficient. In addition, the technology adapts to changes in the donor base station to a relay node so that the RAN relay cell identifier can be easily updated to reflect the new donor base station identifier. The relationship that exists between the relay node and its donor base station can be readily derived from the relay node cell's RAN relay cell identifier. Furthermore, the search for new neighbor cells is efficient because of the connectivity that can be associated with the donor base station identifier part of the RAN relay cell identifier, and the connectivity to the donor base station identifier associations that are very smaller than connectivity to RAN relay cell identifier associations. In other words, there will likely be fewer donor base stations to maintain the path than relay nodes. In the given exemplary problematic scenario, in the fundamentals section, the first eNB can determine that the relay node is served by the second eNB, with the first eNB already having established connectivity to the second eNB. As a result, no additional connectivity searches need to be performed due to the relay node cell revealing. Furthermore, RAN relay cell identifiers for relay nodes fit the concepts of relay node cells that operate as virtual cells to a donor base station. By “reusing” the donor base station identifier to form part of the RAN relay cell identifier, the relay cell is established as a “virtual” cell to the donor base station making it easier to address relay cell as well as configure the cell. relay and register it with the core network.
    [0058] While various embodiments have been shown and described in detail, the claims are not limited to any particular embodiment or example. None of the above descriptions should be read to imply that any particular element, step, range, or function is essential, as it should be included within the scope of the claims. The scope of patented matter is defined by the claims only. The extent of legal protection is defined by the words cited in the deferred claims and their equivalents. All structural and functional equivalents to the elements of the preferred embodiment described above that are known to those skilled in the art are expressly incorporated herein by reference and are intended to be embraced by the present claims. Furthermore, it is not necessary for a device or method to address each and every problem sought to be solved by the described technology, as this is to be covered by the present claims. No claim is intended to invoke paragraph 6 of 35 USC §112 unless the words “means to” or “step to” are used. In addition, no modality, feature, component, or step in this specification is intended to be dedicated to the public regardless of whether the modality, feature, component, or step is named in the claims.
    权利要求:
    Claims (12)
    [0001]
    1. Method at an operations and maintenance (O&M) node for identifying a relay cell served by a radio relay node (12, 44, 60) in a radio access network (RAN) (40) of a system of cellular communications wherein there is a radio connection between the relay radio node and a donor base station (14, 42, 70), wherein the RAN donor base station is identified by a base station cell identifier donor base station, characterized in that it comprises the steps of: receiving the donor base station cell identifier from the relay radio node, determining (S1) a RAN relay cell identifier that uniquely identifies the relay cell within the RAN , the RAN relay cell identifier includes a relay cell identifier and the donor base station cell identifier; and providing (S2) the RAN relay cell identifier to the relay radio node so that the relay radio node can transmit the RAN relay cell identifier to uniquely identify the relay cell to one or more relay terminals. radio in the RAN.
    [0002]
    2. Method according to claim 1, characterized in that the operations and maintenance (O&M) node maintains a list of relay cell identifiers allocated to each donor base station.
    [0003]
    3. Method according to claim 1, characterized in that it further comprises: determining a change in donor base station for the relay radio node to a different donor base station, and changing the RAN relay cell identifier to include a different donor base station identifier associated with the different donor base station.
    [0004]
    4. Method according to claim 1, characterized in that the information destined for the relay node is routed in a core network of the cellular communications system using the donor base station identifier and the donor base station routes information to the node of relay based on the relay cell identifier.
    [0005]
    5. Method according to claim 1, characterized in that the relay cell is treated as a virtual cell of the donor base station.
    [0006]
    6. Method according to claim 1, characterized in that the cellular communications system is based on LTE, the donor base station is a donor eNB, and the RAN relay cell identifier is a global cell identifier of E-ULTRAN relay that includes a PLMN identifier, a donor eNB E-ULTRAN identifier, and a cell identifier.
    [0007]
    7. Method according to claim 1, characterized in that the radio connection between the relay radio node and an initial donor radio base station to the relay radio node is established using a fastening procedure.
    [0008]
    8. Method according to claim 1, characterized in that the relay cell identifier is taken from a dedicated sub-range of an entire range of cell identifiers.
    [0009]
    9. Operations and Maintenance (O&M) Node (18, 27, 50) for use in configuring or reconfiguring an identity of a relay cell served by a relay radio node (12, 44, 60) in an access network (RAN) (40) of a cellular communications system wherein there is a radio connection between the relay radio node and a donor base station (14, 42, 70), wherein the donor base station is identified by a RAN donor base station cell identifier, the operations and maintenance (O&M) node characterized in that it comprises: electronic circuitry (52) configured to determine a RAN relay cell identifier that identifies uniquely the relay cell within the RAN, the RAN relay cell identifier includes a relay cell identifier and the donor base station cell identifier, wherein the donor base station cell identifier is received at the operations and maintenance (O&M) node of the relay radio node; communications circuitry (58) configured to provide the RAN relay cell identifier to the relay radio node so that the relay radio node can transmit the RAN relay cell identifier to uniquely identify the relay cell. relay to one or more radio terminals in the RAN.
    [0010]
    10. Node according to claim 9, characterized in that the operations and maintenance (O&M) node is configured to maintain a list of relay cell identifiers allocated to each donor base station.
    [0011]
    11. Node according to claim 9, characterized in that it is additionally configured to: determine a change in donor base station for the relay radio node to a different donor base station, and change the relay cell identifier of RAN to include a different donor base station identifier associated with the different donor base station.
    [0012]
    12. Node according to claim 9, characterized in that the relay cell identifier is taken from a dedicated sub-range of an entire range of cell identifiers.
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    MX2012011120A|2012-10-15|
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    US8620302B2|2013-12-31|
    CN102835135B|2015-07-29|
    EP2553953B1|2016-07-13|
    US20110244851A1|2011-10-06|
    EP2553953A1|2013-02-06|
    US20140192657A1|2014-07-10|
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    WO2011121399A1|2011-10-06|
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    法律状态:
    2021-03-16| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2021-03-23| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-12-14| B350| Update of information on the portal [chapter 15.35 patent gazette]|
    2021-12-21| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2022-02-15| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 26/01/2011, OBSERVADAS AS CONDICOES LEGAIS. PATENTE CONCEDIDA CONFORME ADI 5.529/DF, QUE DETERMINA A ALTERACAO DO PRAZO DE CONCESSAO. |
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