WO2012060345A1 - 中継局及び再接続方法 - Google Patents
中継局及び再接続方法 Download PDFInfo
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- WO2012060345A1 WO2012060345A1 PCT/JP2011/075119 JP2011075119W WO2012060345A1 WO 2012060345 A1 WO2012060345 A1 WO 2012060345A1 JP 2011075119 W JP2011075119 W JP 2011075119W WO 2012060345 A1 WO2012060345 A1 WO 2012060345A1
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- WIPO (PCT)
- Prior art keywords
- base station
- donor base
- station
- relay station
- cell list
- Prior art date
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/19—Connection re-establishment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/26—Cell enhancers or enhancement, e.g. for tunnels, building shadow
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/04—Terminal devices adapted for relaying to or from another terminal or user
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/04—Error control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/20—Selecting an access point
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/042—Public Land Mobile systems, e.g. cellular systems
- H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Definitions
- the present invention relates to a relay station and a reconnection method.
- a relay station In a cellular mobile communication system, a relay station (Relay Node :) is used between a base station (eNB) and a user apparatus (UE) in order to expand cell coverage and / or to load balance a base station (eNB).
- RN may be provided.
- the base station (eNB) in this case functions as a master station and is referred to as a donor base station (Donner eNodeB: DeNB).
- Donner eNodeB DeNB
- a base station that is neither a donor base station nor a donor base station may be referred to as an “eNB” as long as there is no fear of confusion.
- the user apparatus (UE) is typically a mobile station, but may be a fixed station.
- the radio interface between the base station (eNB) and the relay station (RN) is referred to as “Un”.
- the radio interface between the relay station (RN) and the user equipment (UE) is referred to as “Uu”.
- Radio link between the relay station (RN) and donor base station (DeNB) If the radio link between the relay station (RN) and donor base station (DeNB) is interrupted, it must be restored.
- 3GPP 3rd Generation Partnership Project
- the initial connection procedure is performed when a radio link failure (RLF) occurs. This stipulates that the radio link should be re-established (this point is described in Non-Patent Document 1).
- the initial connection procedure is similar to the procedure after power-on of the user equipment (UE), in addition to the procedure in which the relay station (RN) establishes a communication link with the base station (eNB) and the switching center (MME), It includes a procedure for establishing a communication link for a donor base station (DeNB) of a relay station (RN) and a switching center (RN-MME) connected to the donor base station (DeNB). Therefore, there is a concern that it takes a considerably long time from the start to the completion of the initial connection procedure.
- An object of the present invention is to enable quick recovery when a radio link between a relay station and a donor base station is interrupted.
- a relay station in a communication system After an initial communication link is established between each of the relay station, base station, and exchange, a cell list indicating one or more donor base station candidates is acquired from a maintenance management node connected to the exchange.
- a communication unit for starting a session of the relay station by executing an initial connection procedure for establishing a communication link to any donor base station in the cell list and an exchange station connected to the donor base station;
- a donor base station that satisfies a predetermined criterion is selected from the cell list stored in the storage unit, and the selected donor base station and the donor base are selected.
- a reconnection control unit that controls the communication unit so as to establish a communication link to the exchange station connected to the station.
- FIG. 1 is a schematic diagram of a communication system according to an embodiment.
- the schematic block diagram of a relay station. 10 is a flowchart showing an operation example according to the first modification. 10 is a flowchart showing an operation example according to a second modification.
- FIG. 1 schematically shows a communication system according to an embodiment of the present invention.
- FIG. 1 shows a user equipment (UE) 11, a relay station (RN) 12, a donor base station (DeNB) 13, an exchange (MME) 14, an exchange (RN-MME) 15, and a maintenance management node (OAM) 16. It is shown.
- UE user equipment
- RN relay station
- DeNB donor base station
- MME exchange
- RAM maintenance management node
- the user apparatus (User Equipment: UE) 11 may be any appropriate apparatus that the user can use for wireless communication.
- the user apparatus (UE) is a mobile phone, an information terminal, a smartphone, a personal digital assistant, a portable personal computer, or the like, but is not limited thereto.
- the relay node (Relay Node: RN) 12 relays communication between the user apparatus (UE) 11 and the donor base station (DeNB) 13.
- the relay station (RN) 12 communicates with the user equipment (UE) 11 via a radio link (Uu).
- the relay station (RN) 12 communicates with a donor base station (DeNB) 13 via a radio link (Un).
- Donor base station (Donner E-UTRAN Node B: DeNB) 13 is a radio resource in addition to relaying communications between user equipment (UE) in the cell and higher order equipment such as switching center (MME) 14. Manage.
- the user apparatus (UE) 11 is directly connected to the donor base station (DeNB) 13 via the relay station (RN) 12 as well as directly to the donor station (RN) 12 without being relayed. It may be connected to a base station (DeNB) 13.
- the donor base station (DeNB) 13 can communicate with the relay station (RN) via the radio link (Un).
- the donor base station (DeNB) 13 is also typically connected to an exchange (MME) 14 and a maintenance management node (OAM) 16 via a wired communication path.
- MME exchange
- OAM maintenance management node
- MME Mobility Management Entity
- RNC donor base station
- the switching center performs subscriber information management, mobility management, outgoing / incoming call control, charging control, QoS control, and the like.
- a maintenance management node (Operation Administration Management: OAM) 16 manages an operation state in the communication network (network), for example, which node has a failure or a malfunction.
- the maintenance management node (OAM) 16 is typically connected to switching centers (MME, RN-MME) 14 and 15 via a wired communication path.
- the broken line between the relay station (RN) 12 and the switching center (RN-MME) 15 does not indicate a physical communication path but merely indicates that a logical path exists. That is, the relay station (RN) 12 and the switching center (RN-MME) 15 perform communication via the donor base station (DeNB) 13, the maintenance management node (OAM) 16, and the like. Solid lines between other nodes indicate physical communication paths (typically wired links).
- FIGS. 2 and 3 show sequences performed between the user equipment (UE), the base station (eNB, DeNB), the exchange (MME, RN-MME), and the maintenance management node (OAM).
- UE user equipment
- eNB base station
- DeNB base station
- MME mobile phone
- RN-MME maintenance management node
- OAM maintenance management node
- the operation is described until the communication link is established after the relay station (RN) is turned on (or reset), and then the radio link is disconnected and the communication link is reestablished.
- a relay station (RN) establishes a communication link after power-on or reset, first establish a communication link in the same way as the user equipment (UE) (phase 1), and then function as a relay station (RN) Establish communication link (phase 2).
- step S21 the relay station (RN) first establishes a radio link with the base station (eNB) as the user apparatus (UE).
- AS setup indicates that this process is related to an access stratum (AS).
- NAS setup indicates that this process is a process related to a non-access stratum (NAS). For example, location registration, authentication processing, subscriber profile setting, mobility management, and the like are performed by this processing. Accordingly, the relay station (RN) can communicate with the base station (eNB) and the switching center (MME) as the user apparatus (UE), and the attach process is completed.
- NAS setup indicates that this process is a process related to a non-access stratum (NAS). For example, location registration, authentication processing, subscriber profile setting, mobility management, and the like are performed by this processing.
- the relay station (RN) can communicate with the base station (eNB) and the switching center (MME) as the user apparatus (UE), and the attach process is completed.
- the relay station (RN) acquires the DeNB cell list from the maintenance management node (OAM).
- the DeNB cell list is a list of base stations that can function as donor base stations (DeNB) among various base stations (eNB). That is, the DeNB cell list indicates one or more donor base station (DeNB) candidates.
- step S24 the relay station (RN) releases the communication link with the base station (eNB) and the switching center (MME), that is, performs detach processing. As a result, the processing in phase 1 is completed and the processing in phase 2 is continued.
- the relay station (RN) performs a cell search while measuring the reception level from the serving cell and neighboring cells, and identifies what base station provides a reception level that is good enough for the relay station (RN) to be connected. .
- the base station thus identified is referred to as “eNB-x” for convenience.
- eNB-x When “eNB-x” is included in the DeNB cell list, “eNB-x” becomes a donor base station (DeNB) of the relay station (RN).
- DeNB donor base station
- any one candidate may be selected as a donor base station according to some criteria. For example, the base station that provides the best reception level may be selected.
- a base station may be selected according to a priority order determined in advance for each base station. Furthermore, any one of a plurality of base station candidates may be selected at random. If an appropriate reception level is provided and a base station corresponding to the DeNB cell list cannot be found, it cannot function as a relay station.
- reception level in this embodiment is broadly defined as an amount representing the quality of the state of the radio link regardless of whether it is an instantaneous value or an average value.
- the reception level may be expressed by, for example, reception power, electric field strength RSSI, desired wave reception power RSCP, path loss, SNR, SIR, Ec / N 0 , CQI, etc., but is not limited thereto.
- Step S25 of Phase 2 a radio link is established for “eNB-x” specified as the donor base station.
- This procedure is a process related to the access stratum (AS) as in the case of step S21.
- step S26 a communication link between the donor base station (DeNB) and the switching center (RN-MME) is established.
- This procedure is a process related to the non-access stratum (NAS) as in step S22.
- Which exchange is “RN-MME” is designated by the donor base station (DeNB).
- the relay station (RN) can communicate with the donor base station (DeNB) and the switching center (RN-MME) as a relay station, and the relay station session starts (step S27).
- the base station (eNB) connected by the relay station (RN) in phase 1 and the donor base station (DeNB) connected in phase 2 may be the same or different.
- the switching center (MME) connected by the relay station (RN) in phase 1 and the switching center (RN-MME) connected in phase 2 may be the same or different.
- the cause is a radio link failure (RLF), a failure due to handover failure (handover failure), or a failure due to RRC configuration (RRC Configuration failure), but is not limited thereto.
- RLF radio link failure
- handover failure a failure due to handover failure
- RRC Configuration failure a failure due to RRC configuration
- the relay station retains the DeNB cell list acquired in step S23 without discarding it, and searches for a connectable base station from the DeNB cell list. If there are multiple base station candidates that provide an appropriate reception level and correspond to the DeNB cell list, any one base station may be selected as a donor base station according to some criteria as described above. Good. A case where a connectable base station can be found in the DeNB cell list and a case where no base station can be found are considered. The operation in each case will be described below.
- step S29 When a connectable cell can be found in the DeNB cell list and a reconnection request for the cell is accepted, in step S31, the relay station (RN) Establish a wireless link with the station.
- This procedure is a process related to the access stratum (AS) as in step S21.
- the base station discovered in step S29 is a donor base station (DeNB) that has been performing a session immediately before the radio link is interrupted.
- the communication link between the donor base station (DeNB) and the switching center (RN-MME) has already been set up in step S26. Therefore, as long as the radio link between the relay station (RN) and the donor base station (DeNB) can be re-established, the session of the relay station (RN) can be resumed promptly (step S32).
- step S29 the operation when a connectable cell (base station) cannot be found in the DeNB cell list or when a reconnection request for a connectable cell is rejected will be described with reference to FIG. To do.
- the processing from step S21 to S29 is the same as the processing of the same number in FIG.
- the initial connection procedure (phases 1 and 2) in steps S21 to S27 is performed. In this case, the DeNB cell list is discarded.
- the failure to find a connectable cell (base station) may be determined by any appropriate criteria. For example, after the start of the cell search in step S29, if a predetermined timer expires without finding a connectable cell, it may be determined that the cell could not be found.
- step S321 the relay station (RN) again moves to the UE mode that operates as the user apparatus (UE), and establishes a radio link with the base station (eNB).
- UE user apparatus
- eNB base station
- step S322 a communication link between the base station (eNB) and the switching center (MME) is established. Accordingly, the relay station (RN) can communicate with the base station (eNB) and the switching center (MME) as the user apparatus (UE), and the attach process is completed.
- the relay station (RN) can communicate with the base station (eNB) and the switching center (MME) as the user apparatus (UE), and the attach process is completed.
- the relay station acquires the DeNB cell list from the maintenance management node (OAM).
- This DeNB cell list is typically the same as that acquired in step S23, but may be different. For example, if the regions are different, different DeNB cell lists are provided. Or the candidate of a donor base station (DeNB) may have changed from viewpoints, such as load distribution and congestion avoidance.
- step S324 the relay station (RN) releases the communication link with the base station (eNB) and the switching center (MME), that is, performs detach processing. As a result, the processing in phase 1 is completed and the processing in phase 2 is continued.
- the relay station (RN) performs a cell search while measuring the reception level from the serving cell and neighboring cells, and identifies what base station provides a reception level that is good enough for the relay station (RN) to be connected. .
- the base station identified in this way is included in the DeNB cell list, the base station becomes a donor base station (DeNB) of the relay station (RN).
- step S325 a radio link is established for the base station identified as the donor base station.
- step S326 a communication link between the donor base station (DeNB) and the switching center (RN-MME) is established.
- the relay station (RN) can communicate with the donor base station (DeNB) and the switching center (RN-MME), and the relay station session starts (step S327).
- FIG. 4 is a flowchart showing an operation example of the relay station (RN). Hereinafter, the operation described with reference to FIGS. 2 and 3 will be described from the viewpoint of the relay station (RN).
- step S41 the relay station (RN) detects that a problem has occurred in the radio link. This step corresponds to step S28 in FIGS.
- step S42 the relay station (RN) maintains the DeNB cell list without discarding it even if the radio link is interrupted. Note that step S42 is shown after step S41, but this does not indicate a temporal order.
- the DeNB cell list is acquired in the initial connection procedure, and is subsequently held by the relay station (RN). Step S42 emphasizes that the DeNB cell list is retained without being discarded.
- step S43 the relay station (RN) performs a cell search to search for a connectable cell. If a connectable cell is found, the flow proceeds to step S44.
- step S44 the relay station (RN) transmits a reconnection request to the base station of the found cell.
- the relay station (RN) receives a reconnection acceptance message from the found cell. Thereafter, the flow proceeds to step S45.
- step S45 the relay station (RN) establishes a radio link with the base station that has made the reconnection request.
- This step corresponds to step S31 in FIG.
- the discovered base station is a donor base station that was in session just before the radio link was broken.
- the communication link between the donor base station and the exchange is already established in the initial connection procedure. Therefore, as long as the radio link between the relay station (RN) and the donor base station (DeNB) can be re-established, the session of the relay station (RN) can be resumed quickly.
- step S43 If a connectable cell could not be found in step S43, a predetermined timer expired in step S44 when a reconnection permission message indicating rejection of the reconnection request was received or a reconnection acceptance message was not received.
- the relay station (RN) discards the held DeNB cell list, transitions to the UE mode that operates as the user apparatus (UE), and performs the initial connection procedure (steps S321 to S327 in FIG. 3) again.
- a communication link is established (step S46).
- FIG. 5 shows a schematic block diagram of the relay station (RN). Of various functional elements provided in the relay station (RN), elements particularly related to the present embodiment are shown.
- the relay station (RN) includes at least a communication unit 50, a DeNB cell list storage unit 51, a radio link state monitoring / determination unit 52, a cell selection unit 53, and a reconnection control unit 54.
- the communication unit 50 performs wireless communication with a donor base station (DeNB) via a wireless interface represented by “Un”. Further, the communication unit 50 performs wireless communication with the user apparatus (UE) via a wireless interface represented by “Uu”.
- the communication unit 50 performs maintenance management connected to the switching center (MME) after establishing communication links among the relay station (RN), the base station (eNB), and the switching center (MME) in the initial connection procedure.
- a DeNB cell list is acquired from the node (OAM). Thereafter, the communication unit 50 selects one of the base stations in the DeNB cell list as a donor base station (DeNB) and is connected to the donor base station (DeNB) and the relay station (RN) through a logical path. Establish communication link to (RN-MME). This completes the initial connection procedure.
- the DeNB cell list storage unit 51 stores the DeNB cell list. Even if the radio link is interrupted, the DeNB cell list is not immediately discarded but is kept. When the initial connection procedure is started again, the DeNB is discarded.
- the DeNB cell list is a list of base stations that can function as donor base stations (DeNB) among various base stations (eNB). That is, the DeNB cell list indicates one or more donor base station (DeNB) candidates.
- the wireless link state monitoring / determination unit 52 monitors the state of the wireless link, and when the state deteriorates, determines whether it is necessary to re-establish the wireless link.
- the radio link state monitoring / determination unit 52 determines whether it is necessary to re-establish the radio link by measuring the reception level of radio waves (specifically, pilot signals) received from the donor base station (DeNB).
- the radio link state monitoring / determination unit 52 also measures the reception level of radio waves arriving from base stations existing around the relay station (RN).
- the cell selection unit 53 performs a cell search and selects a base station suitable for connection.
- the reconnection control unit 54 sets the communication unit 50 to restore the communication link by a simple reconnection procedure or an initial connection procedure that takes time. Control.
- the reconnection control unit 54 searches for a base station that satisfies a predetermined criterion from the held DeNB cell list. Specifically, among the base stations listed in the DeNB cell list, a base station that provides a reception level equal to or higher than a predetermined value is selected as a donor base station (DeNB).
- reconnection control is performed so as to establish a communication link to the selected donor base station (DeNB) and the switching center (RN-MME) connected to the donor base station (DeNB).
- the unit 54 controls the communication unit 50.
- the reconnection control unit 54 re-executes the initial connection procedure. To control.
- Fig. 6 shows the operation flow modified from this point of view.
- the operation flow is the same as the operation flow shown in FIG. 4 except that step S61 is performed after step S41.
- the steps already described in FIG. 4 are given the same reference numerals, and redundant description thereof will be omitted.
- the relay station determines whether the cause is due to a radio link failure (RLF).
- RLF radio link failure
- RLF Configuration failure failure due to RRC configuration
- Whether or not it is caused by RLF can be determined by the latest reception level.
- Whether or not it is caused by a handover can be determined by whether or not it is a failure that occurs when the handover process is executed.
- Whether or not it is caused by the RRC configuration can be determined by comparing the setting values of the RRC configuration of the base station and the relay station. When determining whether or not the failure is caused by handover or RRC configuration, the state of the latest reception level may be considered.
- step S46 the relay station (RN) establishes a communication link among each of the relay station (RN), the donor base station (DeNB), and the switching station (RN-MME) by executing an initial connection procedure.
- the relay station RN
- the donor base station DeNB
- the switching station RN-MME
- the relay station (RN) and the base station (eNB, DeNB) may be a fixed station or a mobile station technically, but are typically fixed stations. Therefore, the geographical positional relationship between the relay station (RN) and the base station (eNB, DeNB) and the radio propagation state between them do not change abruptly. Therefore, it is expected that the possibility that the donor base station (DeNB) to which the relay station (RN) should be connected will change considerably after the radio link is lost and before it is re-established. That is, after the radio link is interrupted, the base station to which the relay station (RN) should connect is highly likely to be a donor base station (DeNB) that has been in session immediately before the radio link is interrupted.
- Fig. 7 shows the operation flow modified from this point of view.
- the operation flow is the same as that shown in FIG. 4 except that the processing in step S71 is performed after step S41.
- the steps already described in FIG. 4 are given the same reference numerals, and redundant description thereof will be omitted.
- step S41 when the radio link is interrupted, it is determined whether the relay station (RN) can connect to the donor base station (DeNB) that has been in session immediately before the radio link is interrupted. Whether or not the connection is possible may be confirmed by determining whether or not the reception level from the donor base station (DeNB) is equal to or higher than a predetermined quality.
- the operation flow proceeds to step S44, and the described processing is performed.
- step S42 When it is not possible to confirm that the connection to the donor base station (DeNB) that has been performing the session immediately before the wireless link is interrupted, the operation flow proceeds to step S42, and the procedure described above is performed thereafter.
- step S71 of FIG. 7 may be performed after step S41 of FIG. 4, and then the process of step S61 of FIG. 6 may be performed.
- the process of step S61 of FIG. 6 may be performed after step S41 of FIG. 4, and then the process of step S71 of FIG. 7 may be performed.
- the present invention may be applied to any appropriate mobile communication system that re-establishes a radio link of a relay station (RN).
- RN relay station
- the present invention includes W-CDMA system, HSDPA / HSUPA W-CDMA system, LTE system, LTE-Advanced system, IMT-Advanced system, WiMAX, Wi-Fi system, etc. May be applied.
- specific numerical examples have been described to facilitate understanding of the invention, these numerical values are merely examples, and any appropriate values may be used unless otherwise specified.
- UE User equipment
- RN Relay station
- DeNB Donor Base Station
- MME Switching Center
- RNC Maintenance node
- Communication unit 51
- DeNB cell list storage unit 52
- Radio link state monitoring / determination unit 53
- Cell selection unit 54
- Reconnection control unit 54
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Abstract
Description
当該中継局、基地局及び交換局各々の間の初期通信リンクが確立された後に、前記交換局に接続された保守管理ノードから、1つ以上のドナー基地局の候補を示すセルリストを取得し、前記セルリスト内の何れかのドナー基地局及び該ドナー基地局に接続された交換局に対する通信リンクを確立する初期接続手順を実行することで、当該中継局のセッションを開始する通信部と、
前記セルリストを格納する格納部と、
前記ドナー基地局との無線リンクが途絶えた場合、前記格納部に格納されている前記セルリストの中から、所定の基準を満たすドナー基地局を選択し、選択されたドナー基地局及び該ドナー基地局に接続された交換局に対する通信リンクを確立するように、前記通信部を制御する再接続制御部と
を有する。
2.動作例
2.1 DeNBセルリストの中で接続可能なセルを発見できた場合
2.2 DeNBセルリストの中で接続可能なセルを発見できなかった場合
2.3 中継局における動作フロー
3.中継局
4.変形例
4.1 第1の変形例
4.2 第2の変形例
4.3 第3の変形例
図1は、本発明の実施例による通信システムの概略を示す。図1には、ユーザ装置(UE)11、中継局(RN)12、ドナー基地局(DeNB)13、交換局(MME)14、交換局(RN-MME)15及び保守管理ノード(OAM)16が示されている。上述したように、ユーザ装置(UE)11及び中継局(RN)12間の無線インターフェースは、「Uu」と言及される。中継局(RN)12及び基地局(eNB)13の間の無線インターフェースは「Un」と言及される。
以下、本実施例による動作例を説明する。
ステップS29において、DeNBセルリストの中で接続可能なセル(基地局)を発見でき、かつ、当該セルに対する再接続要求が受け付けられた場合、ステップS31において、中継局(RN)は、発見した基地局との間で無線リンクを確立する。この手順は、ステップS21の場合と同様に、アクセスストラタム(AS)に関する処理である。通常、ステップS29において発見した基地局は、無線リンクが途絶える直前にセッションを行っていたドナー基地局(DeNB)である。そのドナー基地局(DeNB)と交換局(RN-MME)との間の通信リンクは、ステップS26において既に設定されている。したがって、中継局(RN)とドナー基地局(DeNB)との間の無線リンクさえ再確立できれば、速やかに中継局(RN)のセッションを再開することができる(ステップS32)。
ステップS29において、DeNBセルリストの中で接続可能なセル(基地局)を発見できなかった場合、または、接続可能セルに対する再接続要求が拒否された場合の動作を、図3を参照しながら説明する。図3において、ステップS21-S29までの処理は、図2における同じ番号の処理と同じであるため、重複的な説明を省略する。
図4は、中継局(RN)の動作例を示すフローチャートである。以下、図2及び図3を参照しながら説明した動作を中継局(RN)の観点から説明する。
図5は、中継局(RN)の概略ブロック図を示す。中継局(RN)に備わる様々な機能要素の内、本実施例に特に関連する要素が図示されている。中継局(RN)は、通信部50、DeNBセルリスト格納部51、無線リンク状態監視・判定部52、セル選択部53及び再接続制御部54を少なくとも有する。
<4.1 第1の変形例>
背景技術において言及したように、本願出願時における次世代移動通信システムの3GPP標準仕様の合意事項によれば、無線リンク障害(RLF)が生じた場合、中継局(RN)は初期接続手順を実行することで、通信リンクを復旧する必要がある。この動作を行いつつ、本実施例による動作を行う観点からは、無線リンクが途絶えた原因がRLFによるものである場合、初期接続手順を実行し、RLF以外の原因で無線リンクが途絶えた場合、上記の本実施例による動作を実行することが考えられる。
中継局(RN)及び基地局(eNB、DeNB)は、技術的には固定局でも移動局でもよいが、典型的には固定局である。したがって、中継局(RN)及び基地局(eNB、DeNB)の地理的位置関係やそれらの間の無線伝搬状態は、急激に変化するものではない。したがって、無線リンクが途絶えた後、再確立するまでの間に、中継局(RN)が接続すべきドナー基地局(DeNB)が変わる可能性は、かなり低いことが予想される。すなわち、無線リンクが途絶えた後、中継局(RN)が接続すべき基地局は、無線リンクが途切れる直前にセッションを行っていたドナー基地局(DeNB)である可能性が高い。
上記の第1の変形例及び第2の変形例を組み合わせることも可能である。その場合、図4のステップS41の後に、図7のステップS71の処理が行われ、その後に図6のステップS61の処理が行われてもよい。あるいは、図4のステップS41の後に、図6のステップS61の処理が行われ、その後に図7のステップS71の処理が行われてもよい。
12 中継局(RN)
13 ドナー基地局(DeNB)
14 交換局(MME)
15 交換局(RN-MME)
16 保守管理ノード(OAM)
50 通信部
51 DeNBセルリスト格納部
52 無線リンク状態監視・判定部
53 セル選択部
54 再接続制御部
Claims (8)
- 通信システムにおける中継局であって、
当該中継局、基地局及び交換局各々の間の初期通信リンクが確立された後に、前記基地局を経由して、1つ以上のドナー基地局の候補を示すセルリストを取得し、前記セルリスト内の何れかのドナー基地局及び該ドナー基地局に接続された交換局に対する通信リンクを確立する初期接続手順を実行することで、当該中継局のセッションを開始する通信部と、
前記セルリストを格納する格納部と、
前記ドナー基地局との無線リンクが途絶えた場合、前記格納部に格納されている前記セルリストの中から、所定の基準を満たすドナー基地局を選択し、選択されたドナー基地局及び該ドナー基地局に接続された交換局に対する通信リンクを確立するように、前記通信部を制御する再接続制御部と
を有する中継局。 - 前記ドナー基地局との無線リンクが途絶えた原因が、無線リンク障害(RLF)以外の障害であった場合に、前記再接続制御部は、前記セルリストの中から所定の基準を満たすドナー基地局を選択し、選択されたドナー基地局及び該ドナー基地局に接続された交換局に対する通信リンクを確立するように、前記通信部を制御する、請求項1記載の中継局。
- 前記ドナー基地局との無線リンクが途絶えた原因が、無線リンク障害(RLF)であった場合、前記再接続制御部は、前記初期接続手順を再び行うように前記通信部を制御する、請求項2記載の中継局。
- 前記再接続制御部が、前記セルリストの中から所定の基準を満たすドナー基地局を発見できなかった場合、前記初期接続手順を再び行うように前記通信部を制御する、請求項1に記載の中継局。
- 前記再接続制御部が、前記セルリストの中から所定の基準を満たすドナー基地局を所定のタイマーが満了するまでの間に発見できなかった場合、前記初期接続手順を再び行うように前記通信部を制御する、請求項4記載の中継局。
- 前記再接続制御部が、前記セルリストの中から所定の基準を満たすドナー基地局に対する再接続要求の受付を、所定のタイマーが完了するまでの間に確認できなかった場合、前記初期接続手順を再び行うように前記通信部を制御する、請求項4記載の中継局。
- 所定の基準を満たすドナー基地局の候補が複数個存在する場合、前記再接続制御部は、相対的に受信レベルが良い候補を選択する、請求項1に記載の中継局。
- 移動通信システムの中継局において使用される再接続方法であって、
前記中継局、基地局及び交換局各々の間の初期通信リンクが確立された後に、前記基地局を経由して、1つ以上のドナー基地局の候補を示すセルリストを取得し、前記セルリスト内の何れかのドナー基地局及び該ドナー基地局に接続された交換局に対する通信リンクを確立する初期接続手順を実行することで、前記中継局のセッションを開始し、
前記ドナー基地局との無線リンクが途絶えた場合、格納部に格納されている前記セルリストの中から、所定の基準を満たすドナー基地局を選択し、選択されたドナー基地局及び該ドナー基地局に接続された交換局に対する通信リンクを確立するステップ
を有する再接続方法。
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