CN102083126A - Relay node switching for different transceivers used for different repeated links - Google Patents
Relay node switching for different transceivers used for different repeated links Download PDFInfo
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- CN102083126A CN102083126A CN2009102666995A CN200910266699A CN102083126A CN 102083126 A CN102083126 A CN 102083126A CN 2009102666995 A CN2009102666995 A CN 2009102666995A CN 200910266699 A CN200910266699 A CN 200910266699A CN 102083126 A CN102083126 A CN 102083126A
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Abstract
The invention relates to relay node switching for different transceivers used for different repeated links, describing a relay node of a radio telecommunication network. The relay node comprises a first transceiver and a second transceiver, wherein the first transceiver is suitable for being operated in a first operation mode, wherein a return data communication volume is transmitted through a first relay repeated link extending between the relay node and a first base, and the first base refers to the source access point of the relay node; and the second transceiver is suitable for being operated in a second operation mode, wherein, in the preparation of switching the relay node from the first base to the second base referring to the target access point of the relay node, the access program is performed through a second repeated link extending between the relay node and the second base. The invention further describes a preparation method of switching the corresponding relay node from the first base to the second base.
Description
Technical field
The technical field of relate generally to relaying enhanced wireless communication network of the present invention.Especially, the present invention relates to switch to from first (source) base station of cellular telecommunication network the via node of second (target) base station.In addition, the present invention relates to a kind of method that is used to prepare via node is switched to from first base station second base station.
Background technology
For Long Term Evolution (LTE) communication network, and especially for LTE reinforced electric communication network, the use of via node (RN) is counted as a kind of instrument to be used for improving for example spatial coverage of (a) high data rate, (b) group's mobility of subscriber equipment (UE), (c) provisional network design, (d) data throughout on the cell edge and/or (e) coverage in the new region of communication network.
Via node wirelessly is connected to wireless access network (RAN) by base station (BS).This base station is commonly called donor base station and is called as the alms giver sub-district by the respective cell of the communication network of donor base station definition.Depend on the relaying strategy, RN can (a) be the part of alms giver sub-district or the sub-district of (b) controlling itself.
Under the cell conditions of RN control itself, RN controls one or several sub-district.Further, in each sub-district of RN control, provide unique physical-layer cell identifier.Common BS typically regarded via node as by subscriber equipment, and it is called as the NodeB (eNB) of evolution in LTE.
In double bounce relaying deployment scenario, wherein UE is connected to donor base station via proper what a RN, is called as repeated link and the Radio Link between the subscriber equipment under via node and the via node coverage is called as access link at the Radio Link between via node and the donor base station.For the via node of control it self sub-district, this via node can be counted as having the microminiature base station from backhaul function.Repeated link is used for transmitting and mails to and/or from the backhaul communication amount of Radio Access Network.Access link is used for providing coverage for the subscriber equipment under the sub-district.Compare with the Da Qu base station, typically the spatial coverage of via node is typically littler, the subscriber equipment quantity of service still less, the radio channel state in the access link is better, and the peak-data throughput that each subscriber equipment is realized is higher.
Because the overlay area of via node is little, more via node must be deployed in the big zone.Thereby the via node with self organization ability will help to reduce to be installed and the operation cost.Such via node is to have access function and from the mixing apparatus of backhaul function.Therefore, the self-organizing feature of via node has two aspects: (a) self-organizing of repeated link and (b) self-organizing of access link.
The self-organizing of repeated link means that via node automatically selects donor base station.At present repeated link is under the situation of bad luck, and via node can be reselected the new donor base station that allows better radio channel state.This reselecting of new donor base station is called as via node switching (HO).The self-organizing of access link means that the overlay area of via node and access capability can change and the optimization performance is provided according to current needs.
Known via node is equipped with a wireless set, and it is used for the repeated link that extends between via node and donor base station.Replacedly, the wireless set that is used for repeated link can additionally be shared with access link.As a result, via node only can be set up repeated link with a donor base station simultaneously.This mainly causes two problems:
Problem 1: in such situation, just via node via node before it can begin to separate from source base station switches under the situation of new target (alms giver) base station from base station, old source (alms giver), and via node has to carry out the necessary joining procedure with target BS.During switching cycle, the transmission of backhaul communication amount in the repeated link is suspended, and source base station needs this backhaul communication amount of buffer memory, and uses the so-called X2 interface that extends between the source and target base station to transmit corresponding packet to target BS.The backhaul communication amount of buffer memory will be retransmitted to via node by target BS after handover success is finished.Yet known like this via node changeover program has shortcoming, and promptly it causes the additional long delay for the backhaul communication amount, and influences the service quality end to end (QoS) of RFDC amount, the QoS of service especially in real time.
Problem 2: in order to support the self-organizing of repeated link, quality of wireless channel is measured and is played the part of crucial role usually.By such measurement, via node can be collected important information, such as channel status signal strength signal intensity and/or the interference strength between the donor base station around via node and the via node.When the relaying node is a different frequency in the different repeated link when carrying out such measurement, donor base station will have to suspend its backhaul transport, and this will reduce the data throughput capacity.In addition, if when donor base station and via node all are positioned at the fixed position, via node may adopt the narrow beam directional aerial in the repeated link so that increase signal strength signal intensity and reduce and disturb.This means when the relaying node measurement at via node and when being positioned at the quality of wireless channel of the Radio Link that extends between the candidate target base station in other directions via node need handle its antenna direction.This may increase Measuring Time, even source base station and candidate target base station operate on the same carrier frequency.
Two problems above-mentioned will seriously influence the data throughput capabilities of repeated link.Be different from the interface of UTRAN to subscriber equipment (Ue), it is defined between subscriber equipment and the serving BS, and its carrying is used for the only traffic of unique user equipment, and repeated link will typically carry the backhaul communication amount that is used for all subscriber equipmenies of being connected with the given trunk node.Therefore, the unsteadiness in the repeated link will influence the performance of all these subscriber equipmenies.Therefore, repeated link is compared with access link should be more reliable, and this access link correspondingly carries the only data traffic of unique user equipment.
This need improve the stability of the repeated link that extends in via node and different telecommunication between may donor base station.
Summary of the invention
This needs can be by being met as the described theme of independent claims.The preferred embodiments of the present invention are described by dependent claims.
According to a first aspect of the invention, be provided for the via node of radio telecommunication network.The via node that is provided comprises (a) first transceiver, it is applicable to and operates in first operator scheme, wherein the backhaul data traffic is transmitted via first repeated link that extends between the via node and first base station, the source access point of via node is represented in described first base station: (b) second transceiver, it is applicable to and operates in second operator scheme, wherein switch to from first base station the preparation of second base station of the target access of representing via node, carry out joining procedure via second repeated link that between the via node and second base station, extends at via node.
Described via node (RN) is to be based upon on such idea, if promptly via node has minimum two standalone transceiver one they all are allocated for the repeated link that extends between via node and at least the first and second base stations (BS), via node switches (HO) can be finished in highly effective mode.In the via node changeover program, first base station is that the source base station and second base station are (candidate) target BS.Because the transmission of the changeover program and the backhaul data traffic can be carried out simultaneously, thereby can realize especially high efficiency about data throughout.As a result, with for the configuration of different repeated link only the changeover program of the known via node of a transceiver compare, have shorter time slot, during this gap, the backhaul data traffic has to be suspended.This has caused favourable outcome is exactly to have data volume still less will be buffered on first (source) base station between the switching preparatory stage.
In general, transmission is provided two different transceivers to the via node of description for repeated link.First transceiver can be contemplated to movable transceiver, and it is used to connect via node and first (source) base station to be used for the transmission of the backhaul data traffic.Second transceiver can be contemplated to standby transceiver, because it can only be used to when having considered that the switching when the via node of base station, first (source) base station to the second (target) switches prepares.When standby (second) transceiver was carried out switching joining procedure to target BS, simultaneously, movable (first) transceiver still kept backhaul data traffic transmission with source base station via first repeated link of operation.
In described via node, multi-transceiver can only be used for the reliability that (a) reduces switching and Measuring Time (preparing for switching) and/or (b) increase repeated link.Only during the short moment, via node can make more than a repeated link and remain in Radio Resource control (RRC) connection status.Yet this will typically can too much not influence network architecture.
According to embodiments of the invention, first transceiver is applicable to first carrier frequency operation, and second transceiver is applicable to second carrier frequency and operates.Thereby first carrier frequency is different from second carrier frequency.If this advantage that can provide is exactly first source base station to be compared with second target BS and operate on the different carrier frequency, effectively the via node changeover program can be performed equally.
According to a further embodiment of the invention, the first direction antenna pattern is associated with first transceiver and the second direction antenna pattern is associated with second transceiver.Thus, described first direction antenna pattern spatially is different with described second direction antenna pattern.This advantage that can provide is exactly by disposing beam forming technique, the radiation that first transceiver sends can by space orientation towards first base station and/or the radiation of sending of second transceiver can be by space orientation towards second base station.This also is applicable to reception condition, and the sensitivity of first transceiver can be increased for the radiation of the position that is positioned from first base station thus.Accordingly, the sensitivity of second transceiver can be increased for the radiation of the position that is positioned from second base station.
In other words, by the application of beam forming technique, second base station can be positioned in the direction of directly not pointed to by the antenna direction of the first movable transceiver.
In this respect, mentioning beam shaping is known signal processing technology, and it can be used in in directivity signal transmission or the aerial array that receives.Therefore, adaptive by using, the selectivity of exchange or fixing reception/transmission beam pattern implementation space.With the improvement that undirected reception/transmission the is compared reception/transmission gain of being known as.
According to a further embodiment of the invention, via node further comprises common antenna, and it is assigned to first transceiver and second transceiver.This advantage that can provide is that via node can only use an antenna to realize, this antenna is by the two use of first and second transceivers.
Here mention, common antenna can comprise one or more antenna elements.When using different antennae element (it is fed same radio signal, yet has different appropriate phase shift), wave beam described above forms and can be implemented.Have, this also is applicable to reception condition again, and the sensitivity that wherein receives radio signals is spatially uneven.
According to further embodiment of the present invention, via node further comprises second antenna that (a) distributes to first antenna of first transceiver and (b) distribute to second transceiver.Therefore, first antenna is different from second antenna.If first and second transceivers are with different direction in space antenna direction graphic operations, this can be particularly advantageous.
According to a further embodiment of the invention, second transceiver further is applied to operate in other first operator scheme, wherein the backhaul data traffic is transmitted via second repeated link that extends between the via node and second base station, and the other source access point of via node is represented in described second base station after the switching from first base station to second base station has been finished.
This can mean the second standby transceiver insert second (target) base station and switch completed successfully after, the second initial standby transceiver can the deputy activity transceiver.This advantage that can provide is not need after switching to discharge or terminate in connection between second transceiver and second base station completing successfully.
In general, finish switch after old standby transceiver will become new movable transceiver and will be in new repeated link and the target base station exchange backhaul data traffic.
According to further embodiment of the present invention, first transceiver further is applied to operate in other second operator scheme, wherein the further switching of three base station of via node from second base station to the other target access of representing via node is prepared, carry out other joining procedure via the 3rd repeated link that between via node and the 3rd base station, extends.
This can mean that after the second standby transceiver successfully inserts second (target) base station movable transceiver will leave the initial source base station and become new standby transceiver and be used to via node to prepare further to switch.
In this respect, should be mentioned that except second base station that the 3rd base station can be any base station in the communication network.Especially, (a) the 3rd base station can be different from first and second base stations or (b) the 3rd base station can be first base station.The latter means that with respect to first switching, second switching has opposite direction, and promptly via node switches to first base station from second base station.
According to a further aspect of the present invention, be provided for preparing via node is switched to from first base station of cellular telecommunication network the method for second base station, wherein said via node comprises first transceiver and second transceiver.The method that is provided comprises: (a) in first operator scheme to first transceiver operation, wherein the backhaul data traffic is transmitted via first repeated link that extends between the via node and first base station, the source access point of via node is represented in described first base station, and (b) in second operator scheme to second transceiver operation, wherein switch to from first base station the preparation of second base station of the target access of representing via node, carry out joining procedure via second repeated link that between the via node and second base station, extends at via node.
The method of describing is based on such idea equally, if promptly comprise two standalone transceiver---they all are allocated for the repeated link that extends between the via node and at least the first and second base station BSs, via node switches (HO) can be finished in highly effective mode.In the via node changeover program, first base station is that the source base station and second base station are (candidate) target BS.High efficiency especially in regard to data throughout can be implemented, and can be carried out simultaneously because switch the transmission of the preparation and the backhaul data traffic.
Noted here is that the method for describing also can be applied in the switching preparation of subscriber equipment from the first radio access point to the second radio access point in the corresponding way, and wherein subscriber equipment includes two wireless sets and/or duplex wireless electricity transceiver.Therefore, the first radio access point can be first base station or first via node.Accordingly, the second radio access point can be second base station or second via node.Therefore, can use same notion about the influencing each other between movable transceiver and standby transceiver as mentioned above of described via node.
According to embodiments of the invention, the joining procedure of carrying out via second repeated link comprises the execution process of measurement, and this is relevant with the switching decision of via node from first base station to second base station.
Via node can be carried out suitable process of measurement by first base station configuration especially.Receive corresponding configuration messages, via node just can begin second wireless set and measure radio plot, and described radio plot operates on the different frequency that parallels with each the transmission of first base station of cell-of-origin or Serving cell.This advantage that can provide is that the measurement during inter-frequency measurements can fully be avoided at interval or can be reduced significantly at least.
According to further embodiment of the present invention, this method further comprises the fact that via node is disposed first transceiver and second transceiver and is notified to first base station.This advantage that can provide is that the base station can adopt following changeover program to produce the fact that effective changeover program described above can be performed.This had superiority especially when wherein at least one via node disposed two aforesaid transceivers if communication network comprises dissimilar via nodes.Therefore, depend on the ability of via node separately, the base station can for traditional via node switch or above-described improvement from the via node changeover program that benefits two useful transceivers of different repeated links is prepared.
Preferably, the base station is directly notified by via node.This can be such as realizing with measurement report and/or in this measurement report, this measurement report from via node be sent to first base station and wherein via node report to first base station, the quality of the radio channel of between the via node and first base station, extending especially.
Selectable, show that the ability of the via node that has two transceivers can be given first base station from the relaying node report via via node ability pass-along message, this can be by first base station requests.
According to further embodiment of the present invention, the service via node was continued via first transceiver in notice via node first base station during this method further was included in the joining procedure of carrying out with second transceiver.This advantage that can provide be exactly via node be exactly the improvement ability that via node is known in first base station with notified such fact.Therefore, the reliable switching of via node from first base station to second base station can be implemented.In other words, utilize corresponding notice signaling, via node notified (for example by first base station) via node should keep its first transceiver activity.
In response to this information that offers via node, via node can continue data packet transmission with first base station.Simultaneously, second or standby transceiver can carry out to second (target) base station synchronously.
According to further embodiment of the present invention, this method further comprises (a) via node is switched to second base station from first base station, (b) handoff completion message is sent to first base station from second base station and shows that switching finishes, and (c) transmit data to second base station from first base station, described data have been addressed to via node 140,240 and its be buffered on first base station 110,210.This can mean that handoff completion message can play the part of the trigger that is used to begin transmit to second target BS separately from first source base station separately the data that cushioned.
According to further embodiment of the present invention, this method further comprises the first transceiver inertia that makes at least about first repeated link that extends between the via node and first base station.The operation that this advantage that can provide is first transceiver can be reduced at least in part, if the service of first repeated link will not be required after once successful switching.Therefore, the energy consumption of via node can be reduced effectively.
In this respect, should be mentioned that on via node, indicate RRC connect reconfigure the corresponding message of finishing to be sent to second base station after predetermined time interval can be defined.If do not have first transceiver of packet by before to be delivered to and/or come from first base station, perhaps predetermined time interval expiration, first transceiver can be closed or the operation of first receiver can be reduced at least.
According to further aspect of the present invention, a kind of computer-readable medium is provided, stored computer program on it and be used to prepare via node is switched to second base station from first base station of cellular telecommunication network.This computer program is applicable to control or carries out switching preparation method described above when being carried out by data processor.
Computer-readable medium can be read by computer or processor.Computer-readable medium can be, is exemplified as but is not limited to electricity, magnetic, light, ultrared or semi-conductive system, equipment or transmission medium.Computer-readable medium can comprise at least one following medium: the computer distribution medium, program recorded medium, recording medium, computer-readable memory, random access storage device, Erasable Programmable Read Only Memory EPROM, computer-readable software distributes and wraps computer-readable signal, computer readable telecommunications signal, the computer-readable printing device, computer readable compressed software package.
According to a further aspect of the present invention, provide program element to be used to prepare via node is switched to second base station from first base station of cellular telecommunication network.Program element when being carried out by data processor, is used for control or carries out switching preparation method described above.
Program element can for example JAVA, C++ be implemented as the computer-readable instruction sign indicating number with any suitable programming language, and can be stored in (portable hard drive on the computer-readable medium, volatibility or nonvolatile memory, in-line memory/processor, etc.).The command code operation time is used for programmed computer or any other programmable equipment and carries out the function of expection.Program element can be from network, such as obtaining in the World Wide Web (WWW), and can be from wherein downloading.
The present invention can realize by the software mode of corresponding computer program.Yet the present invention can realize by one or more specific electronic circuit corresponding hardware modes equally.In addition, the present invention realizes with mixed form equally, for example, and with the combining form of software module and hardware module.
It may be noted that embodiments of the invention are described with reference to different themes.Especially, some embodiment be with reference to the claim of device type describe and other embodiment is the claim of reference method type describes.Yet, those skilled in the art will from above-mentioned and below description learn: unless other notices, the combination in any that relates to except the combination in any of the characteristic that belongs to one type of theme between the characteristic of different themes between the characteristic of the particularly characteristic of product type claim and Method type claim is considered to open in the present invention.
Aspect defined above and further aspect of the present invention are apparent and explain with reference to the example of these embodiment in the example of described embodiment hereinafter.The present invention will be hereinafter be described in detail but the present invention is not limited to this with reference to the example of embodiment.
Description of drawings
Fig. 1 shows communication network, wherein first wireless set of via node be used for first base station transmit and receive backhaul data and simultaneously second wireless set of via node be used for preparing via node is switched to second base station from first base station.
Fig. 2 illustrates according to signaling diagram of the present invention and is used for switching the corresponding switching measurement of correlation program that starts the multi-transceiver characteristic at via node.
Fig. 3 a has illustrated the via node switch instances that benefits from two transceivers that are used for different repeated links to 3d.
Embodiment
Explanation in the accompanying drawing is exemplary.
Fig. 1 shows communication network 100, and it comprises double bounce relaying deployment scenario.Wherein, via node (RN) 140 connects first base station (BS) 110 by first repeated link 111.Via node 140 is three subscriber equipmenies of service at present, and they are positioned in the relaying sub-district 141.First subscriber equipment (UE) 150 connects via node 140, the second subscriber equipmenies 160 by first access link 151 and connects via node 140 by second access link, 161 connection via nodes 140 and the 3rd subscriber equipment 170 by the 3rd access link 171.
Via node 140 comprises two wireless sets, first wireless set 142 and second wireless set 144.Further, according to the embodiments described herein, via node 140 comprises two antennas, first antenna 143 and second antenna 145.First antenna is assigned to first wireless set 142 and second antenna 145 is assigned to second wireless set 144.Yet, to mention here, via node 140 only can be configured with an antenna or equally more than two antennas.Further, via node 140 can be configured more than two wireless sets.
In the mode of operation of Fig. 1 explanation, first wireless set 142 is movable and safeguards all backhaul data traffics that these backhaul data traffics are transmitted (in up link (UL) direction and/or in down link (DL) direction) by first repeated link 111.Second wireless set 144 is standby transceivers, and it can be closed during most of operating time of via node 140.
Yet, for example when relaying node 140 is recognized the channel quality degrades of first repeated link 111 and/or the quality of second repeated link 121 of extension is better than the channel quality of first repeated link 111 between the via node 140 and second base station 120, standby transceiver 144 will become movable, and beginning is to the joining procedure of second base station 120.This joining procedure can be counted as the part of via node 140 from the switching of 110 to second base stations 120, first base station is prepared.Certainly be same being suitable for for via node 140 from may switching of 110 to the 3rd base stations 130, first base station, the 3rd base station 130 can connect via node 140 by the 3rd repeated link 131.
Here mention, described joining procedure can be performed in first wireless set 142 still is busy with handling by first repeated link 111 time interval of the common backhaul data traffic by second radio transceiver 144.Therefore, under the situation that via node switches, go to and/or have to be suspended the only very short time cycle from the data traffic of different subscriber equipment 150,160,170.The result is, about data throughput capabilities, the efficient of communication network 100, and particularly repeated link 111 and 121 efficient can greatly be reinforced by using via node 140, and this via node comprises be respectively applied for repeated link 111 and 121 two independently wireless sets 142 and 144.
When relaying node 140 is carried out switching from base station, first (source) base station 110 to second (target) 120, under the situation of the direction that the antenna 143 that target BS 120 uses different frequencies and/or target BS 120 to be positioned at movable transceiver 142 for its relaying link transmission does not directly point to, standby transceiver 144 will be carried out the joining procedure of target BS 120, and movable transceiver 142 still keeps by the backhaul communication amount transmission of repeated link 111 with source base station 110 simultaneously.After standby transceiver 144 successfully inserts target BS 120, movable transceiver 142 will leave source base station 110 and become new standby transceiver.In general, old standby transceiver will become new movable transceiver and by new repeated link and target base station exchange backhaul communication amount.
Fig. 2 illustrates according to signaling diagram of the present invention and is used for switching corresponding switching (HO) the measurement of correlation program that starts the multi-transceiver characteristic at via node (RN).Signaling is illustrated among the so-called transaction flow figure and is illustrated, and wherein relates to following network element: via node 240, the first source base stations 210, the second target BS 220, mobile management entity (MME) 280 and gateway 282.
Base station 210,220 can for example be the Node B of evolution among the E-UTRAN.Can communicate by letter via wave point or via wireline interface such as other base stations or other via node with other network elements in base station 210,220.Communicating to connect between different base station is called as the X2 interface in the E-UTRAN standard.Communication between different base station can also take place by the S1 interface, and the S1 interface all is connected to gateway with two base stations and does not therefore directly connect each other.
In the classification of using in Fig. 2, the signal diagram is subdivided into three phases.During the phase I 291, via node 240 is the Radio Resource control (RRC) that is connected with first base station 210.During second stage 292, via node 240 is to be connected to the RRC of first base station 210 and to use the idle RRC that is connected to second base station 220.During the phase III 293, via node 240 is the RRC that are connected to second base station 220.
In cellular telecommunication network, there is not the subscriber equipment of description among Fig. 2, can be portable terminal, they are in spatial movement.The terminal of motion can be introduced other requirement to communication network.Connection can according to demand foundation and after they were not required, resource can be released.Because subscriber equipment may be because its motion be transferred to other sub-districts, the service network element (base station and, if suitable, via node), can exchange information about the motion of relative user equipment.Mobile management entity (MME) 280 and Radio Resource control (RRC) layer are handled such exchange of the information between related network element together.Mobile management entity 280 can safeguard, for instance, the preparation of resource on target BS 220, distributing user equipment is given new Radio Resource, non-access signaling, tracking zone list management, roaming, authentication and/or discharge resources from source base station 210.In other words, mobile management entity 280 serves as and is used for the anchor point that mobile subscriber equipment connects.Further, base station 210,220 can logically be connected to mobile management entity 280.Interface between base station 210,220 and the mobile management entity 280 is called the S1 interface in the E-UTRAN standard.Mobile management entity 280 is parts of the block core (EPC) of the evolution in Long Term Evolution (LTE).
Gateway 282 can be contained in such as in the such service system structure of evolved packet system among the LTE (EPS).In the framework of LTE, EPS is the part of EPC.Gateway 282 comprises and for example is used for the converting users plane to support mobility of user equipment, thereby the function that stop user plane data grouping and route and transmit packet former for paging.Gateway 282 can be connected to outside MME or the both is physically disposed.
Can control generation on (RRC) layer at Radio Resource in the signaling during the changeover program.Yet having can be in the information that is exchanged on physical radio interface (PHY) layer or on medium access control (MAC) layer.The example of this information exchange comprises transmission and synchronous signaling and the user data that up link (UL)/down link (DL) distributes.
In Fig. 2, the dotted arrow explanation is used in the transmission of user data.The solid arrow explanation is used in the transmission of signaling data.
According to embodiment illustrated in fig. 2, via node switches and begins with first step S1, and wherein source base station 210 reconfigures message by RRC and disposes the via node process of measurement.User data is transmitted (a) between via node 240 and the source base station 210 and (b) between source base station 210 and gateway 282 simultaneously.Further, uplink assignment message is sent to via node 240 so that be the allocation of communications uplink radio resources 210 from via node 240 to source base station from source base station 210.Uplink allocation information can be transmitted on physical radio interface or media access control layer.
In the second step S2, via node 240 is triggered and sends " measurement report " with the rule of being set by system information, measurement configuration or the like just.Go in " measurement report " of source base station 210 at this, via node 240 comprises about indicating it also disposes the ability of standby transceiver except that movable transceiver information.Selectable, when source base station 210 requests, the via node ability can be reported source base station 210 from via node 240 via " transmission of via node ability " message.
In next step S3, source base station 210 is made decision and is switched via node 240.This decision is based on " measurement report " above-mentioned and/or RRM (RRM) information.
In next step S4, source base station 210 sends " handoff request " message to target BS 220.Therefore, all that the preparation via node switches on target side must information be switched to target BS 220.
In next step S5, permit control and carry out by target BS 220.Radio Resource if necessary can permit that then this permits controlling E-UTRAN-RAB (E-RAB) service quality (QoS) information that can rely on reception so that increase the possibility of successful switch by target BS 220.
In next step S6, target BS 220 is prepared to switch and is sent " Handover Request Acknowledge " message to source base station 210.Then, source base station 210 may transmit downlink assignment to via node 240 on the physical radio interface layer.Downlink assignment comprises the information about downlink radio resource, and via node 240 can be expected from wherein coming reception information.
In next step S7, source base station 210 produces RRC message and carries out switching.This message can be called as " RRC connect reconfigure " message and be sent towards via node 240 by source base station 210, and this message can be included under the position change situation of via node 240 the mobility control information about via node 240.According to the embodiments described herein, this message also indicates transceiver activity that via node 240 keeps service at present to be used for the packet data transmission (backhaul transport) with source base station 210.
In next step S8, based on detecting the indication that keeps the activity of service transceiver, via node 240 continues the packet data transmission with source base station 210.Simultaneously, via node 240 is opened its standby transceiver so that be synchronized to target BS 220.
In next step S9, via node 240 is carried out the synchronous of target BS 220 and is represented the target BS 220 of Target cell by Random Access Channel (RACH) access.Therefore, standby transceiver is used.
In next step S10, target BS responds with the message that is used for indicating the distribution of ascending wireless resource and suitable timing advance (TA) value.
In next step S11, when relaying node 240 successfully inserted target BS 220, via node 240 sent RRC message to target BS 220.This message can be called as " RRC connect reconfigure finish " message, utilizes this message, and 220 switching is identified via node 240 from source base station 210 to target BS.
In next step S12, target BS 220 sends " switching is finished " message to source base station 210.This triggers the data forwarding between source base station 210 and target BS 220.At this moment, source base station 210 can begin to transmit the data in buffer grouping to target BS 220.
At via node 240, the preset time interval T can be defined, and it is sent to target BS 220 (referring to step S11) afterwards in " the RRC connection reconfigures and finishes " message from via node 240.If in this time interval, there is not packet to be passed to source base station 210 and/or to come from source base station 210 by transceiver before the via node 240, in next step S13, transceiver before via node 240 will be closed, for example, in order to save energy.Simultaneously (at step S13) via node 240 from source base station 210 separate and, the packet that temporarily is buffered in the source base station 210 is passed to target BS 220.
Following step is switched the same with program with original via node.Therefore, they will only briefly be mentioned.
Follow step S13, in order also to provide effective data passes in the uplink direction that switches via node 240, sequence number (SN) state transfer message is sent to target BS 220 from source base station 210.This message can be used so that transmit important state information, and this information is when separating with source base station 210 owing to via node 240 and being attached to that target BS 220 stops source end punishment group when transmission and obtained.
After this, be forwarded to target BS 220 by the packet of source base station 210 high-speed caches and buffering from source base station 210.Receive corresponding packet, they are just cushioned by target BS 220.Simultaneously, user data is transmitted (a) between via node 240 and the target BS 220 and (b) between target BS 220 and gateway 282.
In next step S14, " the route switching request information is sent to MME280 from target BS 220.
In next step S15, MME280 sends the user plane update inquiry information to gateway 282.The user plane updating message can comprise the instruction that exchanges downlink path, and it is finished in next step S 16, and wherein " end mark " message is sent to source base station 210 from gateway 282.Along with finishing of step S16, gateway 282 guarantees that all arrival packets of via node 240 will be from being routed to correct base station now, and it is a target BS 220.
After this, according to the embodiments described herein, user data is sent to target BS 220 from gateway 282.Further, " end mark " message is sent to target BS 220 from source base station 210.
In next step S17, gateway 282 is triggered and transmits " user plane upgrades response " message to MME280.
In next step S18, carry out this step with the reception of response to " user plane upgrades response " message, MME280 sends " path exchange request is confirmed " message to target BS 220.
In next step S19, target BS 220 sends " release of via node context " message to source base station 210.By this information, source base station 210 learns that it can be discharged into the Radio Resource that has been assigned to via node 240 so far.In next step S20, source base station 210 discharges these Radio Resources.From then on, the via node changeover program of description is done.
Fig. 3 a has illustrated that to 3d the via node of carrying out switches in the reinforced communication network 300 of relaying.This network 300 comprises first base station 310, the second base stations 320, via node 340 and the subscriber equipment 350.Via node 340 is crossed over relaying sub-district 341, and subscriber equipment 350 is positioned at wherein.The radio communication of subscriber equipment 350 by double bounce (base station to via node and via node to subscriber equipment) is serviced.
According to the embodiments described herein, via node 340 comprises three wireless sets, first wireless set, 342, the second wireless sets 344 and the 3rd wireless set 348.For example be that first wireless set 342 and second wireless set 344 are used to respectively to communicate by letter with one uplink radio in the base station 310 and 320 as what can from Fig. 3 a, find out.The 3rd wireless set 348 is used for passing through the downlink radio communication of access link 351 between via node 340 and subscriber equipment 350.Further, via node 340 comprises controller 345, each coupling in it and wireless set 342,344 and 348 and be used for adjusting and/or controlling the operation of each wireless set 342,344,348.
Illustrated switch instances benefits from the shown duplexing transceiver that is used for the repeated link that extends between via node 340 and two base stations 310 and 320.Depend on the active state of wireless set 342 and 344, first repeated link 311 can be set up between the via node 340 and first base station 310.Correspondingly, second repeated link 321 can be set up between the via node 340 and second base station 320.
In first mode of operation shown in Fig. 3 a, first wireless set 342 is movable and radio data is transmitted by up link and/or down link by first repeated link 311.Opposite with it, second wireless set 344 is that passive second repeated link 321 that makes only is potential (inactive) repeated link.This means that via node 340 exclusively is connected to base station 310 by first transceiver 342.
In second mode of operation shown in Fig. 3 b, via node 340 is prepared from the switching of 310 to second base stations 320, first base station.Therefore, the activity of remaining of first transceiver 342 makes that the data communication between the via node 340 and first base station 310 can be continued.Yet, first mode of operation that is different from communication network 300, second transceiver 344 also becomes movable and signal strength signal intensity that measure the pilot signal that transmits by second base station 320, the candidate target base station of second base station, 320 these interval scales for the via node of planning switches.Corresponding measurement result is reported to movable transceiver.According to the embodiments described herein, the radio communication by first repeated link is performed first radio frequency and the radio communication by second repeated link is performed second radio frequency that is different from first radio frequency.
In the 3rd mode of operation shown in Fig. 3 c, second transceiver inserts second (target) base station 320.First transceiver activity of remaining this moment.Especially, in described embodiment, via node 340 uses first transceiver 342, and 310 reception switchings determine 311a from first (source) base station.Via node 340 keeps 311 activities of first repeated link for data traffic.
In the 4th mode of operation shown in Fig. 3 d, second (target) base station 320 sends handover success message 321a to via node 340.Therefore, second transceiver 344 is used to receive this message 321a.In response to this message 321a, following action is performed:
1. first (source) base station 310 discharges repeated link 311.
2. second transceiver 344 becomes new movable transceiver and makes via node 340 use second transceiver 344 to be connected with second base station 320.
3. first transceiver 342 becomes corresponding new passive standby transceiver.
Advantage below described via node switch instances (it benefits from two transceivers that are used for different repeated links) especially can provide: A): the feasible transfer of data that might when being synchronized to Target cell, keep in the Serving cell of standby transceiver.In order to realize this advantage effectively, source base station should be known the ability of via node, and just, two transceivers can be used to the fact of different repeated links.Further, via node should be opened second (standby) transceiver when maintenance is carried out with the transfer of data of first (activity) transceiver.Further, first (source) base station when should know to the connection of second (target) base station be established and should make before the movable transceiver inertia used.B): compare with known via node switch instances, have less data must be forwarded to second (target) base station, because transfer of data is still carried out before connecting with second (target) base station from first (source) base station.
C): via node can be scheduled continuously and not have via node to switch the interruption that causes.
D): synchronous or Random Access Channel (RACH) failure does not influence the transfer of data in the Serving cell.Only these data are forwarded to second (target) base station when via node can be served really in second (target) base station.
It is to be noted that term " comprises " that not getting rid of other elements or step and " one " or " one " does not get rid of a plurality of.Can make up with different embodiment related the element of describing.It should also be noted that Reference numeral in the claim should not be interpreted as the restriction to the scope of claim.
Reference numerals list:
100 communication networks
110 first base stations
111 first repeated links
120 second base stations
121 second repeated links
130 the 3rd base stations
131 the 3rd repeated links
140 via nodes
141 relaying sub-districts
142 first wireless sets
143 first antennas
144 second wireless sets
145 second antennas
150 first subscriber equipmenies
151 first access link
160 second subscriber equipmenies
161 second access link
170 the 3rd subscriber equipmenies
171 the 3rd access link
210 first base stations
220 second base stations
240 via nodes
280 mobile management entities (MME)
282 gateways
291 phase I: via node is connected with the first base station RRC
292 second stage: via node is connected with the second base station RRC with first base station
293 phase IIIs: via node is connected with the second base station RRC
300 communication networks
310 first base stations
311 first repeated links
311a switches decision message
320 second base stations
321 second repeated links
321a handover success message
340 via nodes
341 relaying sub-districts
342 first wireless sets
344 second wireless sets
345 controllers
348 the 3rd wireless sets
350 subscriber equipmenies
351 access link
Claims (13)
1. the via node that is used for radio telecommunication network (100), described via node (140,240,340) comprising:
First transceiver (142,242), it is applicable to and operates in first operator scheme, wherein the backhaul data traffic is via at via node (140,240,340) and first base station (110,210,310) first repeated link (111 that extends between, 311) transmitted, via node (140,240 is represented in described first base station, 340) source access point, and
Second transceiver (144,344), it is applicable to and operates in second operator scheme, wherein at via node (140,240,340) from first base station (110,210,310) switch to and represent via node (140,240, in the preparation of second base station of target access 340) (120,220,320), via in the via node (140,240,340) and second base station (120,220,320) second repeated link (121,321) that extends between is carried out joining procedure.
2. the described via node of claim as formerly, wherein
-the first transceiver (142,342) is applicable to first carrier frequency operation, and
-the second transceiver (144,344) is applicable to second carrier frequency operation,
Wherein said first carrier frequency is different from described second carrier frequency.
3. as arbitrary described via node of claim formerly, wherein
-first direction antenna pattern and first transceiver (142,342) be associated and
-second direction antenna pattern and second transceiver (144,344) are associated,
Wherein said first direction antenna pattern spatially is different with described second direction antenna pattern.
4. the arbitrary described via node of claim 1-3 as formerly further comprises
Common antenna, it is assigned to first transceiver (142,342) and second transceiver (144,344).
5. the arbitrary described via node of claim 1-3 as formerly further comprises
Be assigned to first transceiver (142) first antenna (143) and
Be assigned to second antenna (145) of second transceiver (144),
Wherein said first antenna (143) is different from described second antenna (145).
6. as arbitrary described via node of claim formerly, wherein
Second transceiver (144,344) further is applied to operate in other first operator scheme, and wherein the backhaul data traffic is via at via node (140,240,340) and second base station (120,220,320) second repeated link (121,321) that extends between is transmitted, from first base station (110,210,310) via node (140 was represented in described second base station after the switching of (120,220,320) was finished to second base station, 240,340) other source access point.
7. the described via node of claim as formerly, wherein
First transceiver (142) further is applied to operate in other second operator scheme, wherein at via node (140,240) from second base station (120,220) to representing via node (140, during the further switching of the 3rd base station (130) of other target access 240) is prepared, carry out other joining procedure via the 3rd repeated link (131) that between via node (140,240) and the 3rd base station (130), extends.
8. be used for preparing with first base station (110 of via node (140,240,340) from cellular telecommunication network, 210,310) switch to the method for second base station (120,220,320), wherein said via node (140,240,340) comprise first transceiver (142,342) and second transceiver (144,344), described method comprises:
In first operator scheme to first transceiver (142,342) operation, wherein the backhaul data traffic is via at via node (140,240,340) and first base station (110,210,310) first repeated link (111,311) that extends between is transmitted, via node (140 is represented in described first base station, 240,340) source access point, and
In second operator scheme, second transceiver (144,344) is operated, wherein at via node (140,240,340) from first base station (110,210,310) switch to second base station (120,220 of the target access of representing via node (140,240), 320) in the preparation, via at via node (140,240,340) and second base station (120,220,320) second repeated link (121,321) that extends between is carried out joining procedure.
9. the described method of claim as formerly, wherein the joining procedure of carrying out via second repeated link (121) comprises:
Carry out process of measurement, its and via node (140,240,340) from first base station (110,210,310) to second base station switching decision of (120,220,320) be correlated with.
10. one of claim 8-9 as formerly described method further comprises:
The fact that via node (140,240,340) is disposed first transceiver (142,342) and second transceiver (144,344) is notified to first base station (110,210,310).
11. the arbitrary described method of claim 8-10 as formerly further comprises
Service via node (140,240,340) is continued via first transceiver (142,342) in notice via node (140,240,340) first base station (110,210,310) during the joining procedure of execution and second transceiver (144,344).
12. the arbitrary described method of claim 8-11 as formerly further comprises
(110,210,310) switch to second base station (120,220,320) from first base station with via node (140,240,340),
(120,220,320) are sent to first base station (110,210,310) and show that switching finishes from second base station with handoff completion message, and
(110,210,310) transmit data to second base station (120,220,320) from first base station, and described data have been addressed to via node (140,240,340) and it has been buffered on first base station (110,210,310).
13. the described method of claim as formerly further comprises
Make first transceiver (142,342), first repeated link (111, the 311) inertia about between via node (140,240,340) and first base station (110,210,310), extending at least.
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