WO2016056075A1 - 無線通信システム、無線基地局、移動局、及び、無線通信制御方法 - Google Patents
無線通信システム、無線基地局、移動局、及び、無線通信制御方法 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/04—Reselecting a cell layer in multi-layered cells
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
- H04W36/00695—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink using split of the control plane or user plane
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0079—Transmission or use of information for re-establishing the radio link in case of hand-off failure or rejection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W88/08—Access point devices
Definitions
- the present invention relates to a radio communication system, a radio base station, a mobile station, and a radio communication control method.
- 3GPP LTE (3rd Generation Partnership Project Project Radio Access Network Network Term Evolution) discusses technology to increase system capacity using small cells in addition to macro cells.
- a “cell” is an example of a wireless area formed according to the reachable range (coverage) of a radio wave transmitted by a radio base station.
- a wireless device such as a mobile station located in a cell can wirelessly communicate with a wireless base station that forms the cell.
- the cell may have a different name depending on the size of the coverage. It may be considered that the size of the coverage varies depending on the difference in the maximum transmission power of the radio base station. For example, the “macro cell” is a cell having a larger coverage than the “small cell”.
- LTE-A 3GPP LTE-Advanced
- a wireless communication system in a mode in which one or a plurality of small cells are superimposed on a macro cell may be referred to as “overlay arrangement”) is being studied.
- Such a wireless communication system may be referred to as a “wireless network”
- a heterogeneous network may be referred to as a “heterogeneous network”.
- a technique in which a mobile station connects to both a macro cell and a small cell and communicates is being studied.
- a technique in which a mobile station connects to and communicates with two different small cells has been studied.
- a mode in which a mobile station connects to and communicates with two different cells may be referred to as dual connectivity (DC).
- a control plane including layer 3 control information such as transmission path (may be referred to as a “path”) setting and handover (HO) control.
- the signal is transmitted / received to / from a base station forming a macro cell, for example.
- a data plane signal including user data is transmitted and received between, for example, both a base station forming a macro cell and a base station forming a small cell.
- the control plane may be referred to as a control plane (C plane) or SRB (Signaling Radio Bearer).
- the data plane may be referred to as a user plane (U-plane) or DRB (Data Radio Bearer).
- the base station to which the control plane is connected may be referred to as a “primary base station”.
- a base station that communicates in cooperation with the primary base station and is connected to the data plane may be referred to as a “secondary base station”.
- the primary base station and the secondary base station may be referred to as “anchor base station” and “assisting base station”, or “master base station” and “slave base station”, respectively.
- anchor base station and “assisting base station” and “slave base station”, respectively.
- master base station and “slave base station”, respectively.
- slave base station In the latest trend of LTE-A, the names “master base station” and “secondary base station” are used.
- the RRC layer may be provided in the master base station and not provided in the secondary base station when performing two-way connection. In this case, various controls for the mobile station, such as handover control, are performed centrally by the master base station (macro cell).
- handover control is performed between master base stations (between macro cells).
- the mobile station transmits / receives a control plane signal related to handover control to / from the master base station when moving between macro cells.
- the mobile station does not transmit / receive a control plane signal to / from the secondary base station (small cell) while being located in the same macro cell.
- the call control switching may be referred to as a “path switch”, and may be regarded as switching control from a path passing through the handover source base station to a path passing through the handover destination base station, for example.
- the path switch involves signaling to the core network that accommodates the handover source and handover destination base stations.
- the core network may include MME (Mobility Management Entity), SGW (Serving Gateway), and the like.
- MME Mobility Management Entity
- SGW Serving Gateway
- the MME processes the control plane signal
- the SGW processes the user plane signal.
- reducing the frequency of call control switching means reducing signaling to the core network.
- one of the objects of the present invention is to improve the performance and characteristics of wireless communication.
- a wireless communication system includes a plurality of wireless base stations and a mobile station that performs multiple communication with the plurality of wireless base stations to perform wireless communication, and the first wireless base station that forms the multiple access is The control plane of the second radio base station forming the multiple access is controlled to control the connection between the mobile station and the second radio base station.
- the radio base station performs radio communication with the mobile station by multiple access including connection via another radio base station and connection not via the other radio base station.
- a control unit that controls a control plane of the other radio base station to control a connection between the mobile station and the other radio base station.
- the radio base station can communicate with the mobile station through a connection that forms one of the multiple connections with the mobile station and a connection that forms the other of the multiple connections.
- a control unit that controls the connection with the mobile station under control of a control plane from another radio base station that performs radio communication with the mobile station.
- the mobile station is configured to communicate with a plurality of radio base stations through multiple access, and the multiple access that is controlled by a control plane from the first radio base station that forms the multiple access. And a control unit for controlling connection using the control plane with the second radio base station forming the network.
- the wireless communication control method is a method in which a mobile station performs multiple communication with a plurality of wireless base stations to perform wireless communication, and a first wireless base station that forms the multiple connection has a first connection that performs the multiple connection.
- the control plane of the two radio base stations is controlled to control the connection between the mobile station and the second radio base station.
- wireless communication performance and characteristics can be improved.
- FIG. 1 It is a figure which shows the structural example of the radio
- (A) is a figure for demonstrating the aspect by which a RRC layer is concentratedly arranged by a master base station
- (B) is for demonstrating the aspect by which a RRC layer is distributed by the master base station and a secondary base station.
- FIG. It is a figure for demonstrating the example of the handover failure between macrocells. It is a figure for demonstrating reconnection of a control plane when the handover between macrocells fails.
- FIG. 4 is a diagram schematically illustrating a case where a master base station fails to transmit a handover command in the wireless communication system illustrated in FIG. 3.
- FIG. 4 is a diagram for explaining reconnection of a control plane when a master base station fails to transmit a handover command in the wireless communication system illustrated in FIG. 3.
- FIG. 5 is a sequence diagram illustrating an operation example when a handover destination of a mobile station is set to a secondary base station in the wireless communication system illustrated in FIG. 3. It is a figure for demonstrating the radio
- FIG. 18 is a sequence diagram showing a comparative example with FIG. 17. It is a block diagram which shows the structural example of the radio
- FIG. 23 shows a system configuration example in the present embodiment.
- the system illustrated in FIG. 23 exemplarily includes apparatuses # 1 to # 4.
- a “cell” is an example of an area that can be formed (or provided) by a corresponding device and can be wirelessly communicated.
- cell # 1 may be provided by device # 1
- cell # 2 may be provided by device # 2
- cell # 3 may be provided by device # 3.
- the cells may be referred to as “sectors”.
- the first radio station that is an example of the device # 1
- cell # 2 may be referred to as sector # 2.
- the first radio station that is an example of the device # 1
- device # 4 may be a movable radio station (fourth radio station). The control plane may be controlled as the apparatus # 4 moves.
- the first radio station # 1 controls the control plane of the third radio station # 3 by transmitting the first information about the control plane to the third radio station # 3. Good.
- the third wireless station # 3 that has received the first information may transmit a control signal for controlling the movement (mobility) of the fourth wireless station # 4.
- the radio station to which the fourth radio station # 4 is connected can be controlled by the control signal.
- a specific example of the control will be described in a first embodiment described later.
- the first radio station # 1 may control the control plane of the third radio station by transmitting second information related to the control plane to the third radio station # 3.
- the third wireless station # 3 that has received the third information may transmit the fourth information that controls the movement of the fourth wireless station # 4 to the second wireless station # 2.
- the wireless station to which the fourth wireless station # 4 is connected can be controlled by the fourth information.
- a specific example of the control will be described in a second embodiment described later.
- FIG. 1 is a diagram illustrating a configuration example of a wireless communication system according to the first embodiment.
- the radio communication system 10 illustrated in FIG. 1 includes radio base stations 100-1 and 100-2, a radio base station 200, a mobile station 300, and a core network 400, for example.
- the present embodiment may be taken as an example in which the content described in the “Summary” is made concrete, and therefore, of course, it can be implemented in combination with the content described in the “Summary”.
- the radio base stations 100-1 and 100-2 exemplarily form macro cells 101-1 and 101-2 which are examples of radio areas. In the case where the radio base stations 100-1 and 100-2 are not distinguished, they are expressed as “radio base station 100”. Similarly, when the macro cells 101-1 and 101-2 are not distinguished, they are expressed as “macro cell 101”.
- the macro cell 101 may be a cell having a coverage radius of 1 to several tens km as a non-limiting example. Note that LTE can cover a cell radius of about 100 km due to specifications.
- the radio base station 100 forming the macro cell 101 is an example of a first radio base station, and may be referred to as a “macro base station 100”.
- the macro base station 100 may be referred to as a “master base station 100”, and may illustratively be an eNB (evolved Node ⁇ ⁇ B).
- the eNB as the master base station 100 may be referred to as “MeNB”.
- the master base station 100-1 is represented as “MeNB # 1”
- the master base station 100-2 is represented as “MeNB # 2”.
- One or a plurality of radio base stations 200 may be installed (overlaid) on one or both of the macro cells 101.
- the radio base station 200 exemplarily forms a small cell 201.
- the small cells 201 may include cells called “femtocells”, “picocells”, “microcells”, “metrocells”, etc., which have a smaller coverage than the macrocells 101.
- the radio base station 200 forming the small cell 201 is an example of a second radio base station, and may be referred to as a “small base station 200”.
- the small base station 200 may be referred to as a “secondary base station 200” for the master base station 100, and may be an eNB illustratively.
- the eNB as the secondary base station 200 may be referred to as “SeNB”.
- FIG. 1 shows an example in which the same number of small cells 201 are arranged in both the macro cells 101-1 and 101-2, but the number of small cells 201 arranged differs between the macro cells 101. May be.
- the master base station 100 and the secondary base station 200 may be connected to the core network 400 so that they can communicate with each other.
- the connection may illustratively be a wired connection. However, wireless connections are not excluded.
- an S1 interface may be used.
- the core network 400 may include MME and SGW. Therefore, the core network 400 may be described as “MME / SGW 400” for convenience.
- the master base stations 100, and the master base station 100 and the secondary base station 200 may be connected so as to be able to communicate with each other.
- the connection may illustratively be a wired connection.
- wireless connections are not excluded.
- an X2 interface may be used for the wired connection.
- the X2 interface is an example of a communication interface between base stations.
- the mobile station 300 can wirelessly communicate with the macro base station 100 in the macro cell 101, and can wirelessly communicate with the small base station 200 in the small cell 201.
- the mobile station 300 may be referred to as a UE (User Equipment) 300.
- “Wireless communication” may be regarded as communication via a wireless link.
- the “radio link” may be referred to as a “radio bearer”.
- UE 300 can wirelessly communicate with both macro base station 100 and small base station 200 through two-way connection.
- the UE 300 transmits a macro base station (master base station) by a radio link including a control plane represented by a solid line arrow C and a user plane represented by a dotted line arrow U. Station) 100. Further, the UE 300 may be connected to the small base station (secondary base station) 200 by a radio link including a user plane represented by a dotted arrow U.
- the UE 300 may be connected to both the master base station 100 and the secondary base station 200 by the user plane, and may be connected to the master base station 100 by a common control plane for each user plane.
- a control plane signal is transmitted to and received from any one small base station 200, and a data plane signal is transmitted to another small base station 200. May be sent and received between.
- the data plane signal may be transmitted / received to / from a plurality of small base stations 200 including the small base station 200 that transmits / receives a control plane signal.
- FIG. 1 and 2 illustrate an arrangement in which the entire coverage of the small cell 201 is included in the macro cell 101, but there is a small cell 201 in which the coverage is partially included in the macro cell 101. May be.
- the small cell 201 may be arranged at the boundary between the macro cells 101-1 and 101-2.
- the wireless area is not limited to this example.
- the macro cell 101-1 and the macro cell 101-2 are formed by physically separate base stations 100-1 and 100-2, respectively. It may be formed. In this case, it is possible to use the name “cell”, but it may be more intuitive to use the name “sector”.
- the UE 300 located in the macro cell 101-1 moves to another macro cell 101-2 via the small cell 201 as indicated by a solid arrow in FIG.
- FIG. 4A a case is assumed in which the RRC layer that processes the control plane is provided only in the master base station 100 among the master base station 100 and the secondary base station 200.
- the secondary base station 200 does not have a function of processing the RRC layer. In other words, although the secondary base station 200 has a function for processing the RRC layer, the processing of the RRC layer is not functioning.
- the secondary base station 200 may receive RRC signaling related to setting or resetting of multiple access from the master base station 100, and may transmit RRC signaling from the own station 200 to the master base station 100. is there.
- the RRC signaling may be transmitted as a message called “X2 message”, and the message may be called an Inter-node RRC message or the like.
- the state where the processing of the RRC layer does not function as described above may be referred to as “stop state”, “prohibited state”, “disable state”, “sleep state”, or the like of the RRC layer.
- the secondary base station 200 potentially has the processing capability of the RRC layer, it may be understood that the capability is stopped, prohibited, disabled, or sleeping.
- the fact that the RRC layer is centrally arranged in the master base station 100 may be regarded as the secondary base station 200 being set in such a state.
- FIG. 4B shows another arrangement example of the RRC layer, and the RRC layer is arranged as “anchor RRC” and “assisting RRC” in both the master base station 100 and the secondary base station 200.
- An example is shown.
- this arrangement example is an arrangement example that has become a candidate for adoption in 3GPP but has not been finally adopted.
- RLF Radio Link Failure
- the UE 300 autonomously searches for the connectable master base station 100 and tries to connect to the control plane (in other words, reconnect the RRC layer).
- the master base station 100-1 fails to transmit a handover (HO) command because the UE 300 moves from the macro cell 101-1 to another macro cell 101-2 at high speed.
- HO handover
- the UE 300 cannot communicate with the control plane and the user plane because the radio link quality with the master base station 100-1 deteriorates. (See dotted arrow) and RLF occurs.
- the master base station 100-1 cannot follow the movement of the UE 300 as illustrated in FIG. 7 in a state in which the UE 300 is dual-connected to both the macro cell 101 and the small cell 201. The same applies when command transmission fails.
- the UE 300 performs two-way connection to both the master base station 100-1 and the secondary base station 100-2 to communicate between the control plane (C) and the user plane (U).
- C control plane
- U user plane
- the user plane is branched at the master base station 100-1, one is directly connected to the UE 300, and the other is connected to the UE 300 via the secondary base station 100-2.
- the branched user plane may be referred to as a “split bearer”.
- the split bearer passing through the master base station 100 may be referred to as “master bearer (MB)”
- the split bearer passing through the secondary base station 200 may be referred to as “secondary bearer (SB)”.
- the branch of the user plane may be, for example, before the PDCP (Packet Data Convergence Protocol) layer, between the PDCP layer and the RLC (Radio Link Control) layer, or between the RLC layer and the MAC (Medium Access Control) layer. It may be between.
- PDCP Packet Data Convergence Protocol
- RLC Radio Link Control
- MAC Medium Access Control
- the present invention is not limited to this, and the user plane may be branched in any layer.
- the UE 300 cannot maintain the radio link with the master base station 100-1, and the control plane and user Both planes cannot communicate.
- the UE 300 can take over the user via the secondary base station 200 by taking over the control plane to the secondary base station 200. It seems that plain communication can be continued.
- the master base station 100-1 determines that communication with the UE 300 is impossible, and the radio bearer established with the UE 300 through the two-way connection is used. All settings are released. Further, all data addressed to the UE 300 is discarded along with the release.
- the UE 300 tries to reconnect the RRC layer to the master base station 100-2.
- the control plane can be re-established.
- the user plane can be established.
- the handover destination of the UE 300 is set to the secondary base station 200 instead of the master base station 100-2, the HO failure rate is likely to be reduced, but path switch signaling to the core network 400 occurs.
- An example is shown in FIG.
- data addressed to the UE 300 from the core network (MME / SGW) 400 is transferred to the MB via the master base station 100-1 and the SB via the secondary base station 100-2 by two-way connection. It is assumed that data is transmitted via both (processing P101).
- the master base station 100-1 detects deterioration of the radio link with the UE 300 and decides to execute the handover, it transmits a HO request (HOHREQ) to the secondary base station 200 (process P102).
- HOHREQ a HO request
- the secondary base station 200 When the secondary base station 200 receives the HO request, the secondary base station 200 performs HO preparation such as settings necessary for communication with the UE 300 as the HO destination base station.
- the “HO destination base station” may be referred to as a “target base station”.
- the secondary base station 200 transmits a HO response (HO RES) to the master base station 100-1 that is the HO source base station (processing P103).
- the “HO source base station” may be referred to as a “source base station”.
- the HO response may include an information element for identifying the target base station 200 by the UE 300.
- the master base station 100-1 When the master base station 100-1 receives the HO response from the secondary base station 200, the master base station 100-1 transmits a HO command to the UE 300 (process P104).
- An RRC reconfiguration (RRC REC) message may be used for the HO command.
- the RRC reconfiguration message may include mobility control information (MCI).
- MCI mobility control information
- the UE 300 When the UE 300 receives the HO command from the master base station 100-1, the UE 300 transmits a HO completion (RRC CMP) message to the secondary base station 200 that is the target base station (process P105).
- RRC CMP HO completion
- the secondary base station 200 When receiving the HO completion message from the mobile station 300, the secondary base station 200 transmits (signals) a path switch request to the core network (MME / SGW) 400 (processing P106).
- MME / SGW core network
- the MME / SGW 400 When the MME / SGW 400 receives the path switch signaling from the secondary base station 200, the MME / SGW 400 switches the MB connection that has been connected to the master base station 100-1 to the secondary base station 200. Upon completion of the path switch, the MME / SGW 400 transmits a path switch confirmation response message (Path ⁇ SW ACK) to the secondary base station 200 (processing P107).
- a path switch confirmation response message Path ⁇ SW ACK
- the data addressed to the UE 300 is transmitted to the UE 300 by the MB and SB via the secondary base station 200 (process P108).
- the implementation of HO is limited to the macro cell 101, and therefore, it does not match the idea of reducing the signaling to the core network 400 as much as possible (reverse).
- the master base station 100 permits the secondary base station 200 to use the RRC layer temporarily or normally (processing P11).
- the secondary base station 200 that has received the permission controls the RRC layer that processes the signal of the control plane with the UE 300 (processing P12).
- the secondary base station 200 can transmit the HO command (directly) to the UE 300 instead of the handover source master base station 100.
- the UE 300 can receive the HO command transmitted by the secondary base station 200.
- the HO-source master base station 100 can take over the control plane processing to the secondary base station 200. Therefore, the secondary base station 200 can try reconnection of the control plane (RRC) with the UE 300 while maintaining the SB of the user plane with the UE 300. Further, the secondary base station 200 does not have to transmit / receive signaling for the path switch to / from the core network 400.
- RRC control plane
- the UE 300 performs two-way connection to both the master base station 100-1 and the secondary base station 100-2 and performs control plane and user plane communication.
- the radio link quality between the UE 300 and the master base station 100-1 rapidly deteriorates.
- the master base station 100-1 When the master base station 100-1 detects the deterioration of the radio link quality with the UE 300, the master base station 100-1 permits the secondary base station 200 to use the RRC layer as illustrated in (3) of FIG. And the user plane is taken over to the secondary base station 200. Then, as illustrated in (4) of FIG. 11, the secondary base station 200 that is permitted to use the RRC layer controls connection of the control plane with the UE 300.
- the UE 300 can continue data communication via the secondary base station 200 even if the radio link with the master base station 100 is disconnected.
- the delay of data communication can be reduced as compared to reconnecting the wireless link (control plane and user plane) from scratch. Also, discarding of user plane data can be prevented.
- the secondary base station 200 does not need to send signaling for path switching to the core network 400, an increase in overhead due to signaling to the core network 400 can be avoided.
- the secondary base station 200 (small cell 201) can be effectively used, communication load can be distributed and efficient operation of the wireless communication system 10 can be realized.
- the expression “permit use of the RRC layer” is used, but “activate (activate) the RRC layer”, “enable (enable) the RRC layer”, etc. An expression may be used.
- the secondary base station 200 may start processing of the RRC layer and start connection control of the control plane with the UE 300.
- FIG. 12 shows an example of a sequence for realizing the processing described above with reference to FIGS.
- data addressed to the UE 300 from the core network (MME / SGW) 400 is transferred to the MB via the master base station 100-1 and the SB via the secondary base station 100-2 by two-way connection. It is assumed that data is transmitted via both (processing P21).
- the master base station 100-1 detects deterioration of the quality of the radio link with the UE 300 (process P22) and decides to execute HO, it transmits a HO request (HO REQ) to the secondary base station 200. (Process P23).
- the degradation of the radio link quality may be detected by comparison with a predetermined quality threshold.
- the deterioration of the radio link quality may be referred to as a radio link problem.
- the master base station 100-1 may include control information indicating that the control plane connection control by the RRC layer may be started in the HO request addressed to the secondary base station 200.
- the control information is illustratively expressed as “RRC activation”.
- RRC activation the control information
- explicit information “RRC activation” it may be considered that a normal HO request itself corresponds to the control information. In that case, “RRC activation” may not be included in the HO request.
- the control information indicating “RRC activation” may be transmitted from the master base station 100 to the secondary base station 200 separately from the HO request. However, HO processing delay can be reduced by including control information indicating “RRC activation” in the HO request.
- the secondary base station 200 When the secondary base station 200 receives the HO request including “RRC activation”, the secondary base station 200 recognizes that its own station 200 is set as the HO destination base station (target base station) of the UE 300. Further, by receiving “RRC activation”, the secondary base station 200 recognizes that the use of the RRC layer is permitted.
- the secondary base station 200 prepares for handover such as settings necessary for communication with the UE 300 as the target base station, and enters a state in which connection control of the control plane using the RRC layer is possible. Therefore, the secondary base station 200 is in a state where it can transmit an RRC layer message (for example, a HO command) to the UE 300.
- an RRC layer message for example, a HO command
- the secondary base station 200 transmits a HO response (HO RES) to the master base station 100-1 that is the HO source base station (processing P24).
- HO response may be regarded as an acknowledgment message for the reception of “RRC activation”.
- RRC activation the HO source base station
- an information element corresponding to the confirmation response message may be explicitly included in the HO response.
- the secondary base station 200 After transmitting the HO response, the secondary base station 200 transmits the HO command to the UE 300 by the process of the RRC layer (process P25).
- An RRC reconfiguration (RRC REC) message may be used for the HO command.
- the RRC reconfiguration message may include mobility control information (MCI).
- MCI mobility control information
- the MCI may include an information element that identifies the secondary base station 200 that is the target base station.
- the UE 300 When the UE 300 succeeds in receiving the HO command transmitted by the secondary base station 200, the UE 300 transmits an RRC layer connection completion (RRC CMP) message to the secondary base station 200 (process P26).
- RRC CMP RRC layer connection completion
- the secondary base station 200 may increase the transmission frequency of the HO command or increase the transmission power of the HO command.
- the secondary base station 200 When the secondary base station 200 receives the RRC layer connection completion message from the UE 300, the control plane connection (RRC connection) with the UE 300 is successful. Therefore, the secondary base station 200 can continuously transmit the data transmitted to the UE 300 through the SB in the process P21 while maintaining the SB (without disconnecting) the data to the UE 300 (the process P27). ).
- the secondary base station 200 may transmit a resource release (RES) REL) message to the master base station 100-1 that is the HO source base station (processing P28).
- RES resource release
- the master base station 100-1 may release the allocation of radio resources used for communication with the UE 300.
- the secondary base station 200 may end the use of the RRC layer that has received the use permission.
- the separation of the UE 300 from the small cell 201 may be detected, for example, by detecting that the received power of the signal from the UE 300 has fallen below a predetermined power threshold.
- the secondary base station 200 may notify the master base station 100 that has transmitted permission to use the RRC layer to the effect that the UE 300 has left.
- the master base station 100 that has received the notification may transmit control information to the secondary base station 200 to control the use of the RRC layer to stop, prohibit, disable, or sleep.
- the secondary base station 200 may autonomously control the use of the RRC layer to stop, prohibit, disable, or sleep when detecting the separation of the UE 300.
- the secondary base station 200 may transmit the fact that the state of the RRC layer is autonomously controlled to the master base station 100 that is the transmission source of the use permission.
- the transmission of the HO request illustrated in FIG. 12 is exemplarily determined (detection) that RLF has occurred after the deterioration of the radio link quality with the UE 300 is detected in the master base station 100-1. It may be carried out in the period until it is done. “Degradation of radio link quality” may be referred to as “radio link problem (radio problem)”.
- the period is defined as “first phase” in 3GGP (TS36.300 Section 10.1.6) as illustrated in FIG.
- a T 1 timer that counts time T 1 after the detection of a radio link failure is defined. If even T 1 timer expires unless a recovery connection RRC layer, RLF is detected.
- UE 300 is certainly the secondary base station 200 before the detection of RLF HO.
- T 2 timer RLF counts the time T 2 from the detection is defined. If even T 2 timer expires unless a recovery connection RRC layer, RRC layer becomes idle.
- the UE 300 can establish a radio link with the radio base station as long as it is a radio base station that stores and manages context information of the UE 300 (hereinafter also referred to as “UE context”). can do.
- the UE context may include, for example, identification information (ID) of the UE 300, information used for security authentication with the radio base station, and the like.
- the UE context may be regarded as minimum information necessary for the UE 300 to establish a radio link with a radio base station and start communication.
- information indicating the communication capability (UE capability, memory size, etc.) of the UE 300 may correspond to the UE context.
- the UE 300 re-transmits the RRC layer (control plane) to the secondary base station 200. You can try to connect.
- FIG. 14 shows an example of a sequence for reconnecting the RRC layer from the UE 300 to the secondary base station 200.
- data addressed to the UE 300 from the core network (MME / SGW) 400 is transferred to the MB via the master base station 100-1 and the SB via the secondary base station 100-2 by two-way connection. It is assumed that data is transmitted via both (process P31).
- master base station 100-1 detects a malfunction of the radio link with UE 300 (process P32) and decides to execute HO, it transmits a HO request (HO REQ) to secondary base station 200. (Process P33).
- the master base station 100-1 may include the UE context of the HO target UE 300 in the HO request addressed to the secondary base station 200.
- the HO request may include control information indicating “RRC activation” described above together with the UE context.
- the UE context may be transmitted from the master base station 100 to the secondary base station 200 separately from the HO request.
- the HO processing delay can be reduced by including the UE context in the HO request.
- the transmission of the HO request including the UE context may be performed before the expiration of the T 1 timer illustrated in FIG. 13 as in the example of FIG.
- the secondary base station 200 When receiving the HO request including the UE context, the secondary base station 200 recognizes that the local station 200 is set as the HO destination base station (target base station) of the UE 300. Further, upon receiving the UE context, the secondary base station 200 may recognize that the use of the RRC layer for the UE 300 is permitted.
- the UE context may be used together with the control information indicating “RRC activation” described above.
- the control information indicating “RRC activation” described above may be explicitly set in the HO request separately from the UE context.
- the secondary base station 200 In response to the reception of the HO request, the secondary base station 200 performs HO preparation such as settings necessary for communication with the UE 300 as the target base station, and also controls connection of the control plane using the RRC layer for the UE 300 Will be possible. Therefore, the secondary base station 200 is in a state where it can receive, for example, an RRC layer connection request from the UE 300.
- the secondary base station 200 transmits a HO response (HO RES) to the master base station 100-1 that is the HO source base station (processing P34).
- HO response may be regarded as an acknowledgment message for the reception of the UE context and “RRC activation”.
- an information element corresponding to the confirmation response message may be explicitly included in the HO response.
- the master base station 100-1 may transmit a HO command to the UE 300 (process P35).
- An RRC reconfiguration (RRC REC) message may be used for the HO command.
- the RRC reconfiguration message may include MCI.
- the MCI may include an information element that identifies the secondary base station 200 that is the target base station.
- the UE 300 fails to receive the HO command transmitted from the master base station 100-1. For example, if the UE 300 does not succeed in receiving the HO command even after a predetermined time has elapsed, the UE 300 may autonomously try to connect the RRC layer to the secondary base station 200. For example, the UE 300 may transmit an RRC layer connection request (RRC CON REQ) message to the secondary base station 200 (process P36).
- RRC CON REQ RRC layer connection request
- the secondary base station 200 Since the secondary base station 200 has already received the UE context, it can receive the RRC layer connection request message transmitted by the UE 300 normally. When receiving the RRC layer connection request message, the secondary base station 200 transmits an acknowledgment (RRC CON REQ ACK) message to the UE 300, for example. When receiving the confirmation response message, the UE 300 transmits, for example, an RRC layer connection request completion (RRC CON REQ CMP) message to the secondary base station 200 (process P37).
- RRC CON REQ ACK acknowledgment
- RRC CON REQ CMP RRC layer connection request completion
- the secondary base station 200 When the secondary base station 200 receives the RRC layer connection request completion message from the UE 300, the control plane connection (RRC connection) with the UE 300 is successful. Therefore, the secondary base station 200 can continuously transmit the data transmitted to the UE 300 through the SB in the process P31 while maintaining the SB (without disconnecting) the data to the UE 300 (process P38). ).
- the secondary base station 200 may transmit a resource release (RES) REL) message to the master base station 100-1 that is the HO source base station (processing P39).
- RES resource release
- the master base station 100-1 may release the allocation of radio resources used for communication with the UE 300.
- the master base station 100-1 transfers the UE context of the UE 300 that is the HO target to the secondary base station 200 and permits the secondary base station 200 to perform connection control of the RRC layer for the UE 300. To do.
- the UE 300 tries to connect the RRC layer to the secondary base station 200 autonomously (or initiatively), The RRC layer can be reconnected.
- the UE 300 may increase the transmission frequency and transmission power of the connection request message.
- the secondary base station 200 may notify the master base station 100, which is the transfer source of the UE context of the RRC layer, of the UE 300 leaving.
- the master base station 100 that has received the notification may transmit control information to the secondary base station 200 to control the use of the RRC layer to stop, prohibit, disable, or sleep.
- the secondary base station 200 may autonomously control the use of the RRC layer to stop, prohibit, disable, or sleep when detecting the separation of the UE 300.
- the secondary base station 200 may transmit the fact that the state of the RRC layer is autonomously controlled to the master base station 100 that is the transmission source of the use permission.
- the secondary base station 200 may discard the UE context received from the master base station 100 in response to detection of leaving of the UE 300.
- the discarding of the UE context may be performed according to control from the master base station 100, or may be performed autonomously by the secondary base station 200.
- the sequence example described above with reference to FIG. 12 and the sequence example described above with reference to FIG. 14 may be combined.
- the secondary base station 200 leads the RRC layer connection with the UE 300 and the UE 300 leads the RRC layer connection with the secondary base station 200 in combination. May be implemented. That is, the first embodiment and the first modification of the first embodiment can be applied in combination.
- the secondary base station 200 attempts to initiatively the RRC layer connection
- UE 300 is leading in the RRC layer It may be attempted to connect.
- FIG. 15 shows a sequence example of the combination.
- data addressed to the UE 300 from the core network (MME / SGW) 400 is transferred to the MB via the master base station 100-1 and the SB via the secondary base station 100-2 by two-way connection. It is assumed that data is transmitted via both (processing P41).
- the master base station 100-1 detects a malfunction of the radio link with the UE 300 (process P42) and decides to execute the handover, it transmits a HO request to the secondary base station 200 (process P43). .
- the secondary base station 200 When receiving the HO request from the master base station 100-1, the secondary base station 200 transmits an HO response to the master base station 100-1 (Process P44). When receiving the HO response from the secondary base station 200, the master base station 100-1 transmits a HO command to the UE 300 (Process P45).
- the master base station 100-1 receives no the RRC layer connection complete message to the predetermined time period from the UE 300, in the period T 1 timer, the secondary base station 200, again, sends the HO request (processing P46).
- the master base station 100-1 may include the UE context in the HO request.
- the secondary base station 200 When receiving the HO request including the UE context, the secondary base station 200 recognizes that the use of the RRC layer for the UE 300 is permitted. As a result, the secondary base station 200 is in a state in which connection control of the control plane using the RRC layer for the UE 300 can be performed, and a HO command can be transmitted to the UE 300.
- the secondary base station 200 transmits a HO response as a confirmation response to the received HO request to the master base station 100-1 (processing P47), and transmits a HO command to the UE 300 by processing of the RRC layer for the UE 300 (processing P48). ).
- the secondary base station 200 Since the UE300 to reception of the HO command fails, the T 1 timer in the secondary base station 200 RLF is detected expired. Then, the secondary base station 200 starts counting by the T 2 timer. In response to the detection of the RLF, the secondary base station 200 may transmit a resource release message to the master base station 100-1 (process P49).
- the master base station 100-1 may release the allocation of radio resources used for communication with the UE 300.
- UE 300 in the period T 2 of the timer after a detection of RLF, may attempt to reconnect the RRC layer to the secondary base station 200. For example, the UE 300 may transmit an RRC layer connection request message to the secondary base station 200 (Process P50).
- the secondary base station 200 Since the secondary base station 200 has already received the UE context, it can receive the RRC layer connection request message transmitted by the UE 300 normally. When receiving the RRC layer connection request message, the secondary base station 200 transmits an acknowledgment (RRC CON REQ ACK) message to the UE 300, for example. When receiving the confirmation response message, the UE 300 transmits, for example, an RRC layer connection request completion (RRC CON REQ CMP) message to the secondary base station 200 (processing P51).
- RRC CON REQ ACK acknowledgment
- RRC CON REQ CMP RRC layer connection request completion
- the secondary base station 200 When the secondary base station 200 receives the RRC layer connection request completion message from the UE 300, the control plane connection (RRC connection) with the UE 300 is successful. Therefore, the secondary base station 200 can continuously transmit the data transmitted to the UE 300 through the SB in the process P41 while maintaining the SB (without disconnection) (process P52). ).
- the UE300 is leading secondary An RRC layer reconnection can be attempted with the base station 200.
- the secondary base station 200 may increase the transmission frequency and transmission power of the HO command.
- the UE 300 may increase the transmission frequency and transmission power of the connection request message.
- the process when the UE 300 leaves the small cell 201 may be the same as the process described above.
- UE 300 can attempt to initiatively the RRC layer connection, in the period T 2 timers, connecting the secondary base station 200 is led to the RRC layer May be tried.
- the master base station 100 may transmit a UE context to the secondary base station 200 when setting up multiple access. In such a case, it is not necessary to include the UE context in the HO request as in the first modification of the first embodiment.
- the third modified example can also be operated in combination with the first embodiment described above and any one of the first modified example and the second modified example of the first embodiment.
- the second embodiment may be regarded as one example in which the content described in the “Summary” is made concrete, and therefore it is of course possible to be implemented in combination with the content described in the “Summary”. .
- the second embodiment can also be implemented in combination with the first embodiment including the first to third modifications described above.
- the secondary base station 200 that has received permission to use the RRC layer determines and determines whether to perform the operation of the first embodiment or the operation of the second embodiment, and performs the determined operation. May be implemented.
- a UE 300 that is two-way connected (DC) to a macro cell 101-1 and a small cell 201 moves from the macro cell 101-1 to another macro cell 101-2 (HO). ).
- DC two-way connected
- HO macro cell 101-2
- control plane connection (RRC connection) is changed from the macro cell 101-1 to the macro cell 101-2 while maintaining the user plane connection with the small cell 201 in the two-way connection with the UE 300.
- RRC connection control plane connection
- DC-HO Such a two-way HO may be referred to as “DC-HO”.
- the master base station 100-1 as a source base station gives a trigger for DC-HO to the secondary base station 200 and permits the use of the RRC layer.
- the secondary base station 200 that has received permission to use the RRC layer can transmit and receive RRC layer messages to and from the target base station 100-2. Therefore, the secondary base station 200 can control the RRC connection with the UE 300 by the target base station 100-2.
- FIG. 17 shows an example of a DC-HO sequence according to the second embodiment.
- UE 300 receives a control plane signal in MB from master base station 100-1, and receives a user plane signal in SB from secondary base station 200. (Process P51a).
- the master base station 100-1 determines execution of DC-HO. Then, the master base station 100-1 transmits HO requests to the master base station 100-2 and the secondary base station 200 of the macro cell 101-2 that is the target of DC-HO, respectively (processing P52a and P53). ).
- the information is an identifier of a secondary bearer, an identifier of a corresponding core network, information on a layer 2 (L2) entity, a logical channel identifier (logical channel identifier), and the like. Also good.
- the L2 entity include a PDCP entity, an RLC entity, and a MAC entity.
- RRC layer message SeNB MOD
- the target base station 100-2 that has received the message transmits a HO response to the source base station 100-1 (process P55). Further, the target base station 100-2 transmits an RRC layer message (SeNB CMP) indicating that the secondary connection is accepted to the secondary base station 200 to the secondary base station 200 (process P56). In addition, the processing order of the process P55 and the process P56 is not ask
- RRC layer message SeNB CMP
- the source base station 100-1 that has received the HO response from the target base station 100-2 transmits a HO command to the UE 300 (process P57).
- the UE 300 that has received the HO command transmits an RRC layer message (RRC CMP) indicating completion of RRC connection to the target base station 100-2 (process P58).
- RRC CMP RRC layer message
- the target base station 100-2 When the target base station 100-2 receives the message from the UE 300, an RRC connection is established between the target base station 100-2 and the UE 300. In other words, the connection source of the MB with the UE 300 is changed from the source base station 100-1 to the target base station 100-2.
- the UE 300 receives a control plane signal from the target base station 100-2 and a user plane signal from the secondary base station 200 (processing P59).
- the target base station 100-2 that has received the message indicating the completion of RRC connection may transmit a resource release (RES) REL) message to the source base station 200-1 (Process P60).
- RES resource release
- the source base station 100-1 may release the allocation of radio resources used for communication with the UE 300.
- the resource release message may be transmitted between the process P58 and the process P59.
- the control plane connection (RRC connection) of the two-way connection with the UE 300 is the secondary base station that has received permission to use the RRC layer from the source base station 100-1. 200 is mainly controlled.
- the source base station 100-1 transmits a HO request to the target base station 100-2 and the target base station 100-2 negotiates a change in RRC connection with the secondary base station 200 (see FIG. 19).
- the processing delay can be reduced.
- FIG. 17 is more between base stations between the transmission of the HO request and the transmission of the HO command to the UE 300.
- Communication in other words, communication via the X2 interface
- the example of FIG. 17 can speed up DC-HO at least about 10 ms than the example of FIG.
- the UE 300 receives a control plane signal from the master base station 100-1 in MB, and receives a user plane signal from the secondary base station 200 in SB. (Process P61).
- the master base station 100-1 determines execution of DC-HO. Then, the master base station 100-1 transmits HO requests to the master base station 100-2 and the secondary base station 200 of the macro cell 101-2 that is the target of DC-HO, respectively (processing P62 and P63). ).
- the target base station 100-2 that has received the message transmits a HO response to the source base station 100-1 (process P65). Further, the target base station 100-2 transmits an RRC layer message (SeNB CMP) indicating that the cancellation of the binary connection is accepted to the secondary base station 200 to the secondary base station 200 (process P66). In addition, the processing order of the process P65 and the process P66 is not ask
- RRC layer message SeNB CMP
- the source base station 100-1 that has received the HO response from the target base station 100-2 transmits a HO command to the UE 300 (processing P67).
- the UE 300 that has received the HO command transmits an RRC layer message (RRC CMP) indicating completion of RRC connection to the target base station 100-2 (process P68).
- RRC CMP RRC layer message
- an RRC connection is established between the target base station 100-2 and the UE 300.
- the secondary base station 200 receives the message (SeNB CMP) transmitted by the target base station 100-2 in the process P66, before the two-way connection is released, the received base plane signal is transmitted to the target base station via the SB. The data is transferred to 100-2 (process P69).
- the secondary base station 200 may transmit a resource release message to the target base station 100-2 (processing P70).
- the target base station 100-2 may release the allocation of radio resources used for the SB with the UE 300.
- the UE 300 receives a signal from the target base station 100-2 through a single MB connection with the target base station 100-2 (processing P71).
- the target base station 100-2 may notify the secondary base station 200 of an SB resource release request (REL (REQ) message (process P72).
- REL REQ
- the secondary base station 200 may release the allocation of SB radio resources and the like.
- the target base station 100-2 may transmit a resource release (RES REL) message to the source base station 100-1 (Process P73).
- the source base station 100-1 may release the allocation of radio resources used for communication with the UE 300.
- cancellation of the two-way connection with the UE 300 is controlled mainly by the secondary base station 200 that has received permission to use the RRC layer from the source base station 100-1. .
- the number of communication between base stations (in other words, communication via the X2 interface) can be reduced, so that the processing delay is reduced and two-way connection is performed.
- the release process can be speeded up.
- FIG. 20 is a block diagram illustrating a configuration example of a wireless communication system according to the above-described embodiments and modifications.
- the macro base station 100 is illustratively connected to the upper layer communication apparatus 4, and the core network (MME / SGW) 400 and other macro base stations are connected via the upper layer communication apparatus 4. 100 can communicate.
- the small base station 200 may be connected to an upper layer communication apparatus in the same manner as the macro base station 100, and the core network 400 is connected via the upper layer communication apparatus. It may be possible to communicate with.
- the macro base station 100 and the small base station 200 are connected to be able to communicate with each other using, for example, an X2 interface.
- Each of the macro base station 100 and the small base station 200 is communicably connected to the mobile station 300 via a radio link.
- the macro base station 100 includes, for example, a communication unit 11 and a control unit 14.
- the communication unit 11 can communicate with the small base station 200, the mobile station 300, and the upper layer communication device 4.
- the communication unit 11 can perform communication between the control plane and the user plane described in the above-described embodiment.
- the communication unit 11 can perform wireless communication with the UE 300 through multiple access including connection via the small base station 200 and connection not via the small base station 200.
- the communication may include transmission / reception of signals such as commands and messages related to the above-described HO.
- the communication unit 11 includes, for example, a reception unit 12 and a transmission unit 13.
- the receiving unit 12 receives one or both of control data and user data from the upper layer communication apparatus 4.
- the control data may correspond to a control plane signal
- the user data may correspond to a user plane signal.
- the receiving unit 12 can output one or both of the received control data and user data to the transmitting unit 13.
- the control data may be data generated by the macro base station 100 itself.
- the control data may include data such as commands and messages related to the aforementioned HO.
- the transmission unit 13 can transmit control data and user data to any one of the upper layer communication apparatus 4, the small base station 200, and the mobile station 300 under the control of the control unit 14. For example, the transmission unit 13 can transmit control data addressed to the mobile station 300 to the mobile station 300. In addition, the transmission unit 13 can transmit user data addressed to the mobile station 300 to the mobile station 300 by MB and transmit other user data to the small base station 200 by SB.
- the control unit 14 comprehensively controls the operation of the communication unit 11 including the reception unit 12 and the transmission unit 13. Moreover, the control part 14 can control data communication according to a communication state.
- the control by the control unit 14, fault detection and the aforementioned radio link control relating to HO corresponding to the fault detection, detection of RLF, may include counting the like of T 1 timer and T 2 timer.
- the control unit 14 is an example of a control unit that controls a control plane (RRC layer) of the small base station 200 to control a connection between the UE 300 and the small base station 200.
- RRC layer control plane
- the small base station 200 includes a communication unit 21 and a control unit 24, for example.
- the communication unit 21 can communicate with the macro base station 100 and the mobile station 300, respectively.
- the communication unit 21 can perform communication between the control plane and the user plane described in the above-described embodiment.
- the communication unit 21 can wirelessly communicate with the UE 300 through a connection that forms one of the multiple connections with the UE 300.
- the communication may include transmission / reception of signals such as commands and messages related to the above-described HO.
- the communication unit 21 includes, for example, a reception unit 22 and a transmission unit 23.
- the receiving unit 22 can receive user data from the macro base station 100 via, for example, the X2 interface, and can output the received user data to the transmitting unit 23.
- the transmission unit 23 can transmit the user data addressed to the mobile station 300 received from the reception unit 22 to the mobile station 300.
- the transmission unit 23 can transmit control data and user data to the macro base station 100 under the control of the control unit 24.
- the control unit 24 comprehensively controls the operation of the communication unit 21 including the reception unit 22 and the transmission unit 23.
- the control unit 24 can control data communication according to the communication state.
- the control by the control unit 24, the control related to the above-described HO, detection of RLF, may include counting the like of T 1 timer and T 2 timer.
- the control unit 24 is an example of a control unit that controls connection with the UE 300 under control of the control plane from the macro base station 100 that performs radio communication with the UE 300 through multiple access.
- the mobile station 300 includes, for example, a communication unit 31 and a control unit 34.
- the communication unit 31 can wirelessly communicate with the macro base station 100 and the small base station 200, respectively. In other words, the communication unit 31 can wirelessly communicate with the plurality of radio base stations 100 and 200 through multiple access.
- the communication unit 31 can perform communication between the control plane and the user plane described in the above-described embodiment.
- the communication may include transmission / reception of signals such as commands and messages related to the above-described HO.
- the communication unit 31 includes, for example, a reception unit 32 and a transmission unit 33.
- the receiving unit 32 can receive control data and user data from the macro base station 100 and can receive user data from the small base station 200.
- the receiving unit 32 can receive user data transmitted from the macro base station 100 via MB and can receive user data transmitted from the macro base station 100 via SB via the small base station 200.
- the control unit 34 comprehensively controls the operation of the communication unit 31 including the reception unit 32 and the transmission unit 33. Moreover, the control part 34 can control data communication according to a communication state.
- the control by the control unit 34, fault detection and the aforementioned radio link control relating to HO, detection of RLF, may include counting the like of T 1 timer and T 2 timer.
- the control unit 34 is an example of a control unit that controls connection using the control plane with the small base station 200 that receives control of the control plane from the macro base station 100.
- the communication units 11, 21, and 31 of the macro base station 100, the small base station 200, and the mobile station 300 can communicate using link layer protocols corresponding to a plurality of link layers, respectively.
- An example of the link layer protocol is a link layer protocol corresponding to a PDCP (Packet Data Convergence Protocol) layer, an RLC (Radio Link Control) layer, a MAC (Medium Access Control) layer, a PHY (Physical) layer, and the like.
- PDCP Packet Data Convergence Protocol
- RLC Radio Link Control
- MAC Medium Access Control
- PHY Physical
- retransmission Automatic Repeat Request
- control is defined in the RLC layer, and retransmission related to user data in which an error has occurred in wireless transmission is performed. If retransmission succeeds within a predetermined number of times, it is determined that reception is successful, but if the number of retransmissions exceeds the predetermined number of times, it is determined that there is an error and RLF is detected.
- the failure detection of the radio link before the RLF is detected may be detected based on the number of retransmissions.
- the mobile station 300 is connected to two wireless base stations, the macro base station 100 and the small base station 200, respectively.
- the mobile station 300 includes three or more wireless base stations. The same processing as in the above-described example is possible even with multiple access to each station.
- FIG. 21 is a block diagram illustrating a hardware configuration example of a radio base station.
- the radio base station illustrated in FIG. 21 exemplarily corresponds to the above-described macro base station 100 and small base station 200, and includes, for example, an antenna 501, a control unit 502, an RF (Radio Frequency) circuit 503, a memory 504, A CPU 505 and a network interface 506 are provided.
- the antenna 501 transmits and receives radio waves to and from the mobile station 300, for example.
- the control unit 502 realizes, for example, the functions of the control unit 14 of the macro base station 100 and the control unit 24 of the small base station 200 illustrated in FIG.
- the control unit 502 may be configured using a processor having a computing capability such as a CPU or MPU.
- the network interface 506 is an interface for communicatively connecting with another wireless base station, for example.
- the macro base station 100 and the small base station 200 may be wire-connected via the network interface 506.
- the CPU 505, the memory 504, and the RF circuit 503 realize, for example, the functions of the communication unit 11 of the macro base station 100 and the communication unit 21 of the small base station 200 illustrated in FIG.
- the memory 504 may store a program or data for realizing the function of the communication unit 11 or the communication unit 21.
- the CPU 505 implements the functions of the communication unit 11 or the communication unit 21 by appropriately reading out programs and data stored in the memory 504 and cooperating with the RF circuit 503 and the like.
- FIG. 22 is a block diagram illustrating a hardware configuration example of the mobile station.
- the mobile station illustrated in FIG. 22 illustratively corresponds to the mobile station 300 described above, and includes, for example, an antenna 511, a control unit 512, an RF circuit 513, a memory 514, and a CPU 515.
- the antenna 511 transmits and receives radio waves to and from one or both of the macro base station 100 and the small base station 200, for example.
- the control unit 512 realizes the function of the control unit 34 of the mobile station 300 illustrated in FIG. 20, for example.
- the CPU 515, the memory 514, and the RF circuit 513 realize, for example, the function of the communication unit 31 of the mobile station 300 illustrated in FIG. That is, for example, the memory 514 may store a program, data, and the like for realizing the function of the communication unit 31.
- the CPU 515 implements the function of the communication unit 31 by appropriately reading out programs and data stored in the memory 514 and cooperating with the RF circuit 513 and the like.
- radio communication system 11 21, 31 communication unit 12, 22, 32 reception unit 13, 23, 33 transmission unit 14, 24, 34 control unit 100-1, 100-2 radio base station (macro base Bureau) 101-1, 101-2 Macrocell 200 Wireless base station (small base station) 201 Small cell 300 Mobile station (UE) 400 core network (MME / SGW) 501 and 511 Antenna 502 and 512 Control unit 503 and 513 RF circuit 504 and 514 Memory 505 and 515 CPU 506 Network interface
Abstract
Description
図23に、本実施形態におけるシステム構成例を示す。図23に例示するシステムは、例示的に、装置#1~#4を備える。「セル」は、該当装置によって形成(あるいは提供)される無線通信可能なエリアの一例である。
本実施形態において、装置#1の一例である第1無線局は、装置#3の一例である第3無線局の制御プレーン(Cプレーン、コントロールプレーン)を制御してよい。装置#4は、移動可能な無線局(第4無線局)であってよい。装置#4の移動に伴って制御プレーンの制御が実施されてよい。
図1は、第1実施形態に係る無線通信システムの構成例を示す図である。図1に示す無線通信システム10は、例示的に、無線基地局100-1及び100-2と、無線基地局200と、移動局300と、コア網400と、を備える。なお、本実施形態は、「概要」で説明した内容を具象化した例として捉えてもよく、したがって、「概要」で説明した内容と組み合わせて実施できることは無論のことである。
UE300は、当該UE300のコンテキスト情報(以下「UEコンテキスト」とも称する。)を記憶、管理している無線基地局であれば、当該無線基地局と無線リンクを確立できるので、当該無線基地局にHOすることができる。なお、UEコンテキストには、例示的に、UE300の識別情報(ID)や無線基地局とのセキュリティ認証に用いられる情報等が含まれてよい。
図12により上述したシーケンス例と、図14により上述したシーケンス例と、は組み合わせて実施してよい。別言すると、セカンダリ基地局200が主導的にUE300とのRRCレイヤの接続を試行することと、UE300が主導的にセカンダリ基地局200とのRRCレイヤの接続を試行すること、とは、組み合わせて実施してよい。すなわち、第1実施形態と、第1実施形態の第1変形例と、は組み合わせて適用できる、ということである。
第1実施形態の第1変形例では、UEコンテキストが、HOの決定に応じて、セカンダリ基地局200に送信されるものと仮定した。しかし、そもそも多元接続を実施しているということは、セカンダリ基地局200が既にUEコンテキストを保持している、と考えることもできる。
上述した第1実施形態及び各変形例では、UE300のHOに伴ってマスター基地局100からRRCレイヤの使用許可を受けたセカンダリ基地局200が、HOコマンドをUE300宛にダイレクトに送信する例について説明した。別言すると、RRCレイヤの使用許可を受けたセカンダリ基地局200が、UE300との間のRRC接続をダイレクトに制御する例について説明した。
図20は、上述した各実施形態及び変形例に係る無線通信システムの構成例を示すブロック図である。図20に示すように、マクロ基地局100は、例示的に、上位レイヤ通信装置4に接続されており、上位レイヤ通信装置4を介してコア網(MME/SGW)400及び他のマクロ基地局100と通信可能である。なお、図20には、図示を省略しているが、スモール基地局200も、マクロ基地局100と同様に、上位レイヤ通信装置に接続されてよく、当該上位レイヤ通信装置を介してコア網400と通信可能であってよい。
マクロ基地局100は、例示的に、通信部11及び制御部14を備える。通信部11は、スモール基地局200、移動局300及び上位レイヤ通信装置4とそれぞれ通信可能である。通信部11は、既述の実施形態で説明した制御プレーン及びユーザプレーンの通信を行なうことが可能である。別言すると、通信部11は、UE300との間で、スモール基地局200を介した接続とスモール基地局200を介さない接続とを含む多元接続により無線通信を行なうことが可能である。当該通信には、既述のHOに関わるコマンドやメッセージ等の信号の送受信が含まれてよい。
一方、スモール基地局200は、例示的に、通信部21及び制御部24を備える。通信部21は、マクロ基地局100及び移動局300とそれぞれ通信することが可能である。通信部21は、既述の実施形態で説明した制御プレーン及びユーザプレーンの通信を行なうことが可能である。別言すると、通信部21は、UE300との間の多元接続の1つを成す接続によりUE300と無線通信することが可能である。当該通信には、既述のHOに関わるコマンドやメッセージ等の信号の送受信が含まれてよい。
移動局300は、例示的に、通信部31及び制御部34を備える、通信部31は、マクロ基地局100及びスモール基地局200とそれぞれ無線通信することが可能である。別言すると、通信部31は、複数の無線基地局100及び200と多元接続により無線通信することが可能である。通信部31は、既述の実施形態で説明した制御プレーン及びユーザプレーンの通信を行なうことが可能である。当該通信には、既述のHOに関わるコマンドやメッセージ等の信号の送受信が含まれてよい。
次に、既述の例におけるマクロ基地局100、スモール基地局200及び移動局300のハードウェア構成例を以下に説明する。
図21は、無線基地局のハードウェア構成例を示すブロック図である。図21に例示する無線基地局は、例示的に、既述のマクロ基地局100及びスモール基地局200に対応し、例えば、アンテナ501、制御部502、RF(Radio Frequency)回路503、メモリ504、CPU505及びネットワークインタフェース506を備える。
図22は、移動局のハードウェア構成例を示すブロック図である。図22に示す移動局は、例示的に、既述の移動局300に対応し、例えば、アンテナ511、制御部512、RF回路513、メモリ514及びCPU515を備える。
10 無線通信システム
11,21,31 通信部
12,22,32 受信部
13,23,33 送信部
14,24,34 制御部
100-1,100-2 無線基地局(マクロ基地局)
101-1,101-2 マクロセル
200 無線基地局(スモール基地局)
201 スモールセル
300 移動局(UE)
400 コア網(MME/SGW)
501,511 アンテナ
502,512 制御部
503,513 RF回路
504,514 メモリ
505,515 CPU
506 ネットワークインタフェース
Claims (13)
- 複数の無線基地局と、
前記複数の無線基地局と多元接続して無線通信する移動局と、を備え、
前記多元接続を成す第1の無線基地局は、
前記多元接続を成す第2の無線基地局の制御プレーンを制御して、前記移動局と前記第2の無線基地局との間の接続を制御する、無線通信システム。 - 前記第1の無線基地局は、
前記移動局の前記第2の無線基地局へのハンドオーバの決定に応じて、前記第2の無線基地局に対して前記制御プレーンの使用許可を示す情報を送信し、
前記第2の無線基地局は、
前記使用許可を示す情報の受信に応じて、前記制御プレーンにて前記移動局との間の接続を制御する、請求項1に記載の無線通信システム。 - 前記使用許可を示す情報は、前記第2の無線基地局に対して前記ハンドオーバを要求するハンドオーバリクエストに含められる、請求項2に記載の無線通信システム。
- 前記移動局との間の接続の制御は、前記第2の無線基地局が、前記移動局宛に前記制御プレーンにてハンドオーバコマンドを送信する制御を含む、請求項2又は3に記載の無線通信システム。
- 前記使用許可を示す情報は、前記第1の無線基地局が前記移動局との間の無線リンクの品質低下を検出してから前記無線リンクに障害が発生したと判定するまでのフェーズにおいて、前記第2の無線基地局へ送信される、請求項2~4のいずれか1項に記載の無線通信システム。
- 前記第1の無線基地局は、
前記移動局の前記第2の無線基地局へのハンドオーバの決定に応じて、前記第2の無線基地局に対して前記移動局のコンテキスト情報を送信し、
前記第2の無線基地局は、
前記コンテキスト情報の受信に応じて、前記制御プレーンにて前記移動局との間の接続を制御する、請求項1に記載の無線通信システム。 - 前記コンテキスト情報は、前記第2の無線基地局に対して前記ハンドオーバを要求するハンドオーバリクエストに含められる、請求項6に記載の無線通信システム。
- 前記移動局との間の接続の制御は、前記移動局が、前記第2の無線基地局に前記制御プレーンの接続を要求するメッセージを送信する制御を含む、請求項6又は7に記載の無線通信システム。
- 前記コンテキスト情報は、前記第1の無線基地局が前記移動局との間の無線リンクの品質低下を検出してから前記無線リンクに障害が発生したと判定するまでのフェーズにおいて、前記第2の無線基地局へ送信される、請求項6~8のいずれか1項に記載の無線通信システム。
- 移動局との間で、他の無線基地局を介した接続と前記他の無線基地局を介さない接続とを含む多元接続により無線通信を行なう通信部と、
前記他の無線基地局の制御プレーンを制御して、前記移動局と前記他の無線基地局との間の接続を制御する制御部と、
を備えた、無線基地局。 - 移動局との間の多元接続の1つを成す接続により前記移動局と無線通信する通信部と、
前記多元接続の他の1つを成す接続により前記移動局と無線通信する他の無線基地局から、制御プレーンの制御を受けて、前記移動局との間の接続を制御する制御部と、
を備えた、無線基地局。 - 複数の無線基地局と多元接続により無線通信する通信部と、
前記多元接続を成す第1の無線基地局から制御プレーンの制御を受けた、前記多元接続を成す第2の無線基地局との間で、前記制御プレーンを用いた接続を制御する制御部と、
を備えた、移動局。 - 移動局は、複数の無線基地局と多元接続して無線通信し、
前記多元接続を成す第1の無線基地局は、前記多元接続を成す第2の無線基地局の制御プレーンを制御して、前記移動局と前記第2の無線基地局との間の接続を制御する、無線通信制御方法。
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JP2020155868A (ja) * | 2019-03-19 | 2020-09-24 | Hapsモバイル株式会社 | 通信制御装置、プログラム、システム、及び制御方法 |
JP7249833B2 (ja) | 2019-03-19 | 2023-03-31 | Hapsモバイル株式会社 | 通信制御装置、プログラム、システム、及び制御方法 |
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EP3206429A4 (en) | 2018-05-09 |
KR20170048535A (ko) | 2017-05-08 |
JPWO2016056075A1 (ja) | 2017-07-13 |
CN111050367B (zh) | 2022-02-22 |
JP6442805B2 (ja) | 2018-12-26 |
CN106797587A (zh) | 2017-05-31 |
US20180199249A1 (en) | 2018-07-12 |
US10555228B2 (en) | 2020-02-04 |
CN111050367A (zh) | 2020-04-21 |
KR101917227B1 (ko) | 2018-11-15 |
US20170188278A1 (en) | 2017-06-29 |
US10051534B2 (en) | 2018-08-14 |
EP3206429A1 (en) | 2017-08-16 |
CN106797587B (zh) | 2021-01-12 |
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