CN102131255B - Switching method and network node (NN) in relay network - Google Patents
Switching method and network node (NN) in relay network Download PDFInfo
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- CN102131255B CN102131255B CN2010100006902A CN201010000690A CN102131255B CN 102131255 B CN102131255 B CN 102131255B CN 2010100006902 A CN2010100006902 A CN 2010100006902A CN 201010000690 A CN201010000690 A CN 201010000690A CN 102131255 B CN102131255 B CN 102131255B
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Abstract
The embodiment of the invention provides a switching method and a network node (NN) in a relay network. The method comprises the following steps: receiving a switching request message sent by a source base station, wherein, the switching request message is used for requesting to switching a terminal to a first site; acquiring information that a second site can be taken as a candidate switching target site from the switching request message, wherein, the second site is a high-level or low-level site of the first site; and when the first site rejects to be taken as the switching target site, sending a switching acknowledgment message to the source base station so as to indicate that the second site agrees to be taken as the switching target site. In the embodiment of the invention, terminal switching can be realized by less message interaction with higher efficiency and less occupied bandwidth resource.
Description
Technical field
The present invention relates to communication technical field, relate in particular to changing method and network node in a kind of junction network.
Background technology
2006, ITU-R(Radio Communication Sector of ITU, radio communication department of International Telecommunications Union) formally by B3G(Beyond Third Generation in mobile communication system, super 3 g mobile communication system) technology called after IMT-Advanced(IMT-Advanced) technology; Former 3G(3rd-generation, 3G (Third Generation) Moblie) technology called after IMT-2000(International Mobile Telecom System-2000, international mobile telephone system-2000) technology.The IMT-Advanced Technology Need is realized higher data rate and larger power system capacity, target peak speed is: low speed moves, 1Gbps(Gigabits per second under the focus covering scene) more than, 100Mbps(MBPS under high-speed mobile, wide area covering scene).LTE (Long Term Evolution, Long Term Evolution) technology has had the technical characterictic of part IMT-Advanced, and the LTE technology further is evolved to LTE-A(LTE-Advanced, the follow-up evolution of LTE technology) technology.
On the one hand, the IMT-Advanced system has proposed very high power system capacity requirement; But on the other hand, be enough to support possible can only the finding in higher frequency band of large bandwidth spectrum of high power capacity, and the path loss of high like this frequency range and penetration loss are all larger, are difficult to the covering realized.LTE-A is in order to meet the capacity requirement of IMT-Advanced, at present using the Relay(relaying technique) as a kind of candidate technologies of improving power system capacity and covering, studied.So-called relaying technique, the better simply double bounce relaying of take is example, exactly the wireless link between base station and terminal is divided into to these two links of wireless link between wireless link, relay station and the terminal between base station and relay station, thereby have an opportunity a second-rate link is replaced with to two quality link preferably, to obtain higher link capacity and better to cover.
In the LTE wireless network, UE(User Equipment, subscriber equipment) business is mapped to DRB(Data Radio Bearer at Uu interface (interface between terminal and its service relaying), Data Radio Bearer), eNB(Evolved Node-B, evolved Node-B) DRB under can identification data also carries out respective handling to data.In the LTE-A junction network, RN(Relay Node, relay station) support LTE UE, at LTE UE, RN is consistent with LTE eNB on function.
In realizing process of the present invention, the inventor finds that in prior art, at least there are the following problems: prior art is in the terminal switching process of junction network, terminal is switched to another base station (as base station 2 from source base station (as base station 1), also be referred to as to call target BS) descend in the situation of RN2, or the RN1 from source base station is switched to another base station (as base station 2, also be referred to as to call target BS) descend in the situation of RN2, if RN2 does not accept handover request, handoff failure will appear.
Summary of the invention
The embodiment of the present invention provides changing method and the network node in a kind of junction network, to realize the switching of terminal.
On the one hand, the embodiment of the present invention provides the changing method in a kind of junction network, and described method comprises: the handover request message that the reception sources base station sends, and handover request message is switched to the first website for request by terminal; Obtaining the second website from handover request message can be as the information of switching candidate target website, and the second website is higher level's website or subordinate's website of the first website; When the first website is disagreed with as the switching targeted sites, send switch acknowledgment message to source base station, using and indicate the second website to agree as the switching targeted sites; Wherein, describedly obtain described the second website can comprise as the information of switching candidate target website from described handover request message: resolve described handover request message, obtain an identification information in described handover request message, described identification information has indicated described the second website can be as the switching candidate target website; Perhaps resolve described handover request message, obtain the switching candidate target site list in described handover request message, described switching candidate target site list comprises described the second website.
On the other hand, the embodiment of the present invention provides the network node in a kind of junction network, comprising: the message sink unit, and the handover request message sent for the reception sources base station, handover request message is switched to the first website for request by terminal; Information acquisition unit, can be as the information of switching candidate target website for obtain network node from handover request message, and network node is higher level's website or subordinate's website of the first website; Message sending unit, for disagreeing with when the first website as switching during targeted sites, send switch acknowledgment message to source base station, and the indication network node of usining is agreed as switching targeted sites; Wherein, described information acquisition unit comprises: the identification (RNC-ID) analytic module, for resolving described handover request message, obtain an identification information in described handover request message, and described identification information has indicated the described network node can be as the switching candidate target website; Perhaps the list parsing module, for resolving described handover request message, obtain the switching candidate target site list in described handover request message, and described switching candidate target site list comprises described network node.
Technique scheme has following beneficial effect: when the targeted sites request is switched, providing higher level's website of targeted sites or the subordinate's website can be as the information of switching candidate target website, if targeted sites is disagreed with switching, terminal can be switched to higher level's website or subordinate's website of targeted sites, realize the successful switch of terminal.
The accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below will the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the changing method flow chart in the embodiment of the present invention one junction network;
To be the embodiment of the present invention two terminal UE be switched to the RN1 method schematic diagram of eNB2 attached from a base station eNB 1 to Fig. 2;
Fig. 2 a is that the RN2 of the embodiment of the present invention two terminal UE from a base station eNB 1 is attached is switched to the RN1 method schematic diagram of eNB2 under attached;
To be the embodiment of the present invention two terminal UE be switched to the RN1 method schematic diagram of eNB2 attached from a base station eNB 1 to Fig. 2 b;
To be the embodiment of the present invention three terminal UE be switched to a plurality of relay station method schematic diagrames of eNB2 attached from a base station eNB 1 to Fig. 3;
To be the embodiment of the present invention four terminal UE be switched to a plurality of relay station method schematic diagrames of eNB2 attached from a base station eNB 1 to Fig. 4;
Fig. 5 is the network node structure schematic diagram in the embodiment of the present invention five junction networks.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making under the creative work prerequisite the every other embodiment obtained, belong to the scope of protection of the invention.
Embodiment mono-:
As shown in Figure 1, be the changing method flow chart in the embodiment of the present invention one junction network, described method comprises:
101, the handover request message that the reception sources base station sends, handover request message is switched to the first website for request by terminal.
102, obtaining the second website from handover request message can be as the information of switching candidate target website, and the second website is higher level's website or subordinate's website of the first website.The described subordinate of the present embodiment website is the relay forwarding node of higher level's website in junction network, between higher level's website and terminal, realizing data retransmission.
Optionally, the first website can be base station, and the second website can be the first website subordinate's relay station.The second website can be base station, and the first website can be the second website subordinate's relay station.
Optionally, obtaining the second website from handover request message can comprise as the information of switching candidate target website: resolve handover request message, obtain an identification information in handover request message, identification information has indicated the second website can be as the switching candidate target website; Perhaps resolve handover request message, obtain the switching candidate target site list in handover request message, the switching candidate target site list comprises the second website.The first website can have a plurality of; When the first website is disagreed with as the switching targeted sites, send switch acknowledgment message to source base station, using and indicate the second website to agree to comprise as the switching targeted sites: to a plurality of the first websites, send respectively handover request message, if receive the switch failure information of a plurality of the first website feedbacks, to source base station, send switch acknowledgment message, using and indicate the second website to agree as the switching targeted sites; Perhaps, to a plurality of first stop point mass-sending handover request message, if receive the switch failure information of a plurality of the first website feedbacks, to source base station, send switch acknowledgment message, using and indicate the second website to agree as the switching targeted sites.Sending respectively handover request message to a plurality of the first websites can comprise: according to the precedence information of a plurality of the first websites that carry in handover request message, to a plurality of the first websites, send successively handover request message.Can also comprise: from handover request message, knowing can be as the community of switching target in the community of the second website; Switch acknowledgment message has also indicated the second website to agree can be as the community of switching target as switching target small area.Know from handover request message in the community of the second website and can comprise as the community of switching target: obtain cell index from handover request message, cell index has been indicated can be as the community of switching target in the community of the second website.
103, when the first website is disagreed with as the switching targeted sites, to source base station, send switch acknowledgment message, using and indicate the second website to agree as the switching targeted sites.
Optionally, in this step, the described switch acknowledgment message sent to source base station can comprise the configuration information of this target BS self,
If target BS sends the situation of information to source base station by X2 message: the configuration information of this target BS self at least can comprise following one or more: new base station access protocol sign (New eNB UE X2APID); The RAB list (E-RABs Admitted list) of accepting, E-RAB ID(E-UTRAN Radio Access Bearer ID wireless access bearing sign), UL GTP tunnel endpoint(UL GPRS Tunnelling Protocol tunnel endpoint, up GTP tunnel end points), DL GTP tunnel endpoint(GPRS Tunnelling Protocol tunnel endpoint, descending GTP tunnel end points); Unacceptable RAB list (E-RABs not admitted list); Target BS is to the transmission container (target eNB to Source eNB Transparent Container) of source base station.
If target BS sends the situation of information to source base station by S1 message: the configuration information of this target BS self at least can comprise following one or more: base station terminal S1 access protocol sign (eNB UE S1AP ID); MME terminal S1 access protocol sign (MME UE S1AP ID); Target-source transparent vessel (Target to Source Transparent Container); Switching type (handover type); Can receive the radio bearer list (e-RABs Subject to Forwarding list) of forwarding, need radio bearer list (e-RAB to Release list) discharged etc.
Said method embodiment of the present invention is providing higher level's website of targeted sites or the subordinate's website can be as the information of switching candidate target website when the targeted sites request is switched, if targeted sites is disagreed with switching, terminal can be switched to higher level's website or subordinate's website of targeted sites, realize the successful switch of terminal, realized the terminal switching with less interacting message, efficiency is higher, and the occupied bandwidth resource is few.
Embodiment bis-:
As shown in Figure 2, for the embodiment of the present invention two terminal UE are switched to the RN1 method schematic diagram of eNB2 attached from a base station eNB 1, the method comprises:
201, the source base station eNB1 of UE receives the measurement report that this terminal UE reports.
202, eNB1 sends handover request message to eNB2.After measurement report that eNB1 can report according to this terminal UE determines to be switched, source base station eNB1 send handover request via the serving BS eNB2 of RN1 to switching candidate target website RN1; Thus, source base station eNB1 is by the interface between the X2(base station) interface sends the serving BS eNB2 of handover request information to RN1.Particularly, this handover request information is X2-AP:handover request message, is an X2-AP message.
203, after the serving BS eNB2 of RN1 receives this handover request information, resolve this handover request message, obtain an identification information in this message.
Specifically about resolving the content of this switching message:
For example eNB1 is when sending handover request message, for example, in the situation that increase a sign (a bit bit) in message: if mean whether RN1 can not receive this terminal UE switching, allow the switching candidate target website of eNB2 as this terminal UE.
Particularly, in this switching message, comprised a sign: for example " 1 " is if mean that RN1 can not receive in the situation of this terminal switching, can allow the switching candidate target website of eNB2 as this terminal.
For example " 0 " is if mean that RN1 can not receive in the situation of this terminal switching, can not allow the switching candidate target website of eNB2 as this terminal.
This sign " 1 " of below take goes on to say the embodiment of the present invention as example.If this is designated " 1 ", eNB2 recognizes if RN1 can not receive in the situation of this terminal switching, can allow the switching candidate target website of eNB2 as this terminal.Therefore eNB2 considers s own situation such as cell load etc., whether can receive this terminal switching.
204, by this handover request message, by Un interface (interface between relay station and its serving BS), the targeted sites RN1 to the candidate sends the serving BS eNB2 of RN1.
Alternatively, eNB2 revises the corresponding eNB UE X2AP ID(s in the handover request message of both sides possibly) information (particularly, can be new eNB UE X2AP ID or old eNB UE X2AP ID), other parts are constant.
Alternatively, eNB2 can also will come from the X2 handover request message content of eNB1, with the form of S1AP handover request message, sends to RN1, adopts the S1 protocol communication on the Un interface.
205, can not accept this receiving terminal handover request as RN1, RN1 replys switch failure information so, and eNB2 receives the switch failure information that RN1 sends.
It should be noted that, when RN1 can accept this handover request, receive the terminal switching, RN1 replys switch acknowledgment message so, by eNB2, finally sends to source base station eNB1, and expression can the receiving terminal switching.
Particularly, this handoff failure Informational Expression is X2AP:HANDOVER PREPARATION FAILURE message.
206, receive the switch failure information that RN1 sends as eNB2, learn that the attached lower relay station RN1 of this target BS eNB2 can not receive this handover request, to eNB1 transmission switch acknowledgment message.
In the above-described embodiments, eNB2, when resolving handover request message, obtains self by an identifier in this message and whether can be used as switching candidate target,
1) this identifier=" 1 " for example
If mean that RN1 can not receive in the situation of this terminal switching, can allow the switching candidate target website of eNB2 as this terminal.
Therefore eNB2 considers s own situation such as cell load etc., determines whether can receive this terminal switching.When eNB2 can receive this terminal switching, eNB2 sends switch acknowledgment message to eNB1.Particularly, eNB2 sends X2-AP Handover request acknowledge message to eNB1 by X2 interface.
ENB2 replys switch acknowledgment message to eNB1, simultaneously in message with self configuration information.This configuration information can be for example: new base station terminal access protocol sign (New eNB UE X2APID); The RAB list (E-RABs Admitted list) of accepting, E-RAB ID(E-UTRAN Radio Access Bearer ID wireless access bearing sign sign), the up GTP tunnel end points of UL GTP tunnel endpoint(UL GPRS Tunnelling Protocol tunnel endpoint), DL GTP tunnel endpoint(DL GPRS Tunnelling Protocol tunnel endpoint, descending GTP tunnel end points); Unacceptable RAB list (E-RABs not admitted list); Target BS is to the transmission container (target eNB to Source eNB Transparent Container) of source base station; Etc..When eNB2 can not receive this terminal switching, eNB2 notice eNB1 handoff failure information.Particularly, this handoff failure Informational Expression is X2AP:HANDOVER PREPARATION FAILURE message.
2) this identifier=" 0 " for example
Mean not allow the switching candidate target website of eNB2 as this terminal.Now as eNB2, receive the switch failure information of RN1, eNB2 will forward the switch failure information of this RN1 to eNB1 so.Particularly, above-mentioned handoff failure information is X2-AP:HANDOVER PREPARATION FAILURE message, is an X2-AP message.
Said method embodiment UE of the present invention is switched in the RN1 situation of eNB2 attached from a base station eNB 1, eNB2 recognizes if RN1 can not receive in the situation of this terminal switching, can allow the switching candidate target website of eNB2 as this terminal, realized the terminal switching with less interacting message, efficiency is higher, and the occupied bandwidth resource is few.It should be noted that, when if UE is switched to eNB2 from a base station eNB 1, handover request message is that request is switched to eNB2, eNB2 recognizes if self can not receive in the situation of this terminal switching, eNB2 can be by resolving handover request message, obtain an identification information in this message, know that eNB2 can not be as switching during targeted sites, RN1 under it is attached can be as the switching candidate target website of this terminal, if RN1 agrees to accept in the situation of this terminal switching, terminal UE can be switched to the RN1 of eNB2 under attached, realize the successful switch of terminal, this embodiment is similar to the above embodiments, repeat no more.
It should be noted that and be, above take be switched to the situation of RN of target BS as example and be introduced from a source base station, from the RN of a source base station, be switched to the situation of RN of target BS applicable too, as shown in Figure 2 a, for the RN2 of the embodiment of the present invention two terminal UE from a base station eNB 1 is attached is switched to the RN1 method schematic diagram of eNB2 under attached, the embodiment of the present invention is not as limit, step in the method and above-mentioned Fig. 2 is similar, its difference is, 202 and 206, wherein, 202 are divided into: 202a, RN2 sends handover request message to eNB1, 202b, eNB1 forwards handover request message to eNB2, 206 are divided into: 206a, when eNB2 receives the switch failure information that RN1 sends, learn that the attached lower relay station RN1 of this target BS eNB2 can not receive this handover request, to eNB1 transmission switch acknowledgment message, 206b, eNB1 forward switch acknowledgment message to RN2.Other steps are identical with Fig. 2.It should be noted that, when if the RN2 of UE from a base station eNB 1 is switched to eNB2, handover request message is that request is switched to eNB2, eNB2 recognizes if self can not receive in the situation of this terminal switching, eNB2 can be by resolving handover request message, obtain an identification information in this message, know that eNB2 can not be as switching during targeted sites, RN1 under it is attached can be as the switching candidate target website of this terminal, if RN1 agrees to accept in the situation of this terminal switching, terminal UE can be switched to the RN1 of eNB2 under attached, realize the successful switch of terminal, this embodiment is similar to the above embodiments, repeat no more.
As shown in Figure 2 b, for the embodiment of the present invention two terminal UE are switched to the RN1 method schematic diagram of eNB2 attached from a base station eNB 1, the method comprises:
201, the source base station eNB1 of UE receives the measurement report that this terminal UE reports;
After the measurement report that 202a, eNB1 report according to this terminal UE determines to be switched, source base station eNB1 sends handover request information to MME by S1 interface (interface between base station and MME), particularly, source base station eNB1 first sends the MME of handover request message to terminal, is realized the forwarding of handover request information by MME; Particularly, this handover request information is S1AP:Handover required(handover request) message is a S1-AP message.
202b, receive handover request message (the S1AP:Handover required(handover request) message of eNB1) after, the MME of terminal sends the serving BS eNB2 of handover request information to RN1 by the S1 interface; Particularly, this handover request information is S1AP:Handover Request(handover request) message is a S1-AP message.
After the serving BS eNB2 of 203a, RN1 receives this handover request information, resolving this switching message is S1AP:Handover Request(handover request) content of message, obtain an identification information in this message, specifically about resolving the content of this switching message:
For example at eNB1 when sending handover request message, for example, in the situation that increase a sign (a bit bit) in message: if mean whether RN1 can not receive this terminal UE to switch, allow the switching candidate target website of eNB2 as this terminal UE.Particularly,
In this switching message, comprised a sign: for example " 1 " is if mean that RN1 can not receive in the situation of this terminal switching, can allow the switching candidate target website of eNB2 as this terminal.
For example " 0 " is if mean that RN1 can not receive in the situation of this terminal switching, can not allow the switching candidate target website of eNB2 as this terminal.
This sign " 1 " of below take goes on to say the embodiment of the present invention as example.If this is designated " 1 ", eNB2 recognizes that eNB2 can be used as the switching candidate target website of this terminal if RN1 can not receive in the situation of this terminal switching.Therefore according to s own situation such as cell load etc., eNB2 considers whether can receive this terminal switching.
The serving BS eNB2 of 203b, RN1 sends to this handover request information candidate's targeted sites RN1; This handover request information is S1AP:Handover Request(handover request) message is a S1-AP message.
Alternatively, eNB2 revises the corresponding S1-AP UE IDs information in this handover request message possibly, and other parts are constant, and this processing procedure correspondence S1-AP proxy mechanism, and HeNB Gate Way function class seemingly.Make for MME, it seems that terminal is connected with base station, in speech then, it looks like with MME and directly links together.
Alternatively, eNB2 can also will come from this S1AP-handover request message content of MME, with the form of X2AP-handover request message, sends to RN1, adopts the X2 protocol communication on the Un interface.
204, can not accept this handover request and receive terminal switching as RN, RN replys handoff failure information so, and eNB2 receives the handoff failure information that RN1 sends; Particularly, above-mentioned handoff failure information is S1-AP:HANDOVER FAILURE message, is a S1-AP message.
It should be noted that, when RN can accept this handover request, receive the terminal switching, RN replys switching request acknowledgement message so, by eNB2, finally sends to source base station eNB1, and expression can the receiving terminal switching.Particularly, above-mentioned switching request acknowledgement message is S1-AP:handover request acknowledge message, is a S1-AP message.
205a, when eNB2 receives the switch failure information that RN1 sends, learn that the attached lower relay station RN1 of this target BS eNB2 can not receive this handover request, to MME transmission switch acknowledgment message.Above-mentioned handoff failure information is S1-AP:HANDOVER FAILURE message, is a S1-AP message.
Due to eNB2, when resolving handover request message, by an identifier in this message, for example learn if RN1 can not receive in the situation of this terminal switching this identifier=" 1 ", can allow the switching candidate target website of eNB2 as this terminal.
Therefore according to s own situation such as cell load etc., eNB2 considers whether can receive this terminal switching.
When eNB2 can receive this terminal switching, eNB2 sends switch acknowledgment message to MME.
ENB2 replys switch acknowledgment message to MME, simultaneously in message with self configuration information.This configuration information can be for example: base station terminal S1 access protocol sign (eNB UE S1AP ID); MME terminal S1 access protocol sign (MME UE S1AP ID); Target-source transparent vessel (Target to Source Transparent Container); Switching type (handover type); Can receive the radio bearer list (e-RABs Subject to Forwarding list) of forwarding, need radio bearer list (e-RAB to Release list) discharged etc.Also comprise:
When eNB2 can not receive this terminal switching, eNB2 notice eNB1 handoff failure information.
Due to eNB2, when resolving handover request message, by an identifier in this message, for example this identifier=" 1 " is learnt and is meaned to allow the switching candidate target website of eNB2 as this terminal.Now as eNB2, receive the switch acknowledgment message of RN1, eNB2 will notify eNB1 switching confirmation so.
Particularly, above-mentioned switching confirmation is S1-AP:handover request acknowledge message, is a S1-AP message.
205b, receive the switch acknowledgment message that eNB2 sends as MME, after learning that eNB2 can receive this handover request, to eNB1 feedback switch acknowledgment message.
Said method embodiment UE of the present invention is switched in the RN1 situation of eNB2 attached from a base station eNB 1, eNB2 recognizes if RN1 can not receive in the situation of this terminal switching, can allow the switching candidate target website of eNB2 as this terminal, realized the terminal switching with less interacting message, efficiency is higher, and the occupied bandwidth resource is few.It should be noted that to be, abovely be switched to the situation of RN of target BS as example is introduced from a source base station, from the RN of a source base station, be switched to the situation of RN of target BS applicablely too, the embodiment of the present invention is not as limit.It should be noted that in addition, when if UE is switched to eNB2 from a base station eNB 1, handover request message is that request is switched to eNB2, eNB2 recognizes if self can not receive in the situation of this terminal switching, eNB2 can be by resolving handover request message, obtain an identification information in this message, know that eNB2 can not be as switching during targeted sites, RN1 under it is attached can be as the switching candidate target website of this terminal, if RN1 agrees to accept in the situation of this terminal switching, terminal UE can be switched to the RN1 of eNB2 under attached, realize the successful switch of terminal, this embodiment is similar to the above embodiments, repeat no more.
Embodiment tri-:
As shown in Figure 3, for the embodiment of the present invention three terminal UE are switched to a plurality of relay station method schematic diagrames of eNB2 attached from a base station eNB 1, the method comprises:
301, the measurement report that the source base station eNB1 receiving terminal UE of UE reports;
302, after the measurement report that eNB1 reports according to this terminal UE determines to be switched, source base station eNB1 sends handover request, and described handover request can be given a plurality of candidate target websites, for example RN1, RN2, RN3 via base station eNB 2;
Base station eNB 2 is candidate target website RN1, RN2, the serving BS of RN3.Thus, source base station eNB1 is by the interface between the X2(base station) interface sends the serving BS eNB2 of handover request information to RN1.Particularly, this handover request information is X2-AP:handover request message, is an X2-AP message.
ENB1 increases a sign (a for example bit bit) in handover request message: for example be designated " 1 " and mean to allow the switching candidate target website of eNB2 as this terminal.And, select to be designated " 1 " and mean that all communities in eNB2 can both be as candidate's Target cell; Perhaps select to be designated " 2 " and mean that certain the several community in eNB2 can be used as candidate target cells, now the target cell ID of the candidate target cells under this eNB2 can mean by the mode of index.Mode by community ID index means specifically:
For example use ECGI(E-UTRAN Cell Global Identifier) identify Target cell, wherein ECGI has comprised PLMN identity(Public Land Mobile Network identity), with E-UTRAN Cell Identifier(28bit), this 28bit has specifically comprised for example leftmost 20bits of this E-UTRAN Cell Identifier of 20bits() for meaning eNB ID or global eNB ID.Can distinguish by remaining 8bits so the different districts below same base station, this 8bits just becomes the candidate cell index of eNB2 particularly.Thereby greatly reduce expense.
Comprehensively above-mentioned, that is to say, mean to allow the switching candidate target website (now eNB2 under community comprise this community situation for one or more, all can be used as candidate target cells) of eNB2 as this terminal for for example being designated " 1 ".And be designated " 2 " and mean that certain the several community in eNB2 can be used as the situation of candidate target cells, eNB1 has comprised eNB2 subordinate community ID index in handover request message, after eNB2 receives this message thus, can know that eNB2 is as candidate target, the community ID index that the candidate target cells specifying information under eNB2 can provide from this message simultaneously obtains.
Alternatively, for the switching candidate target website that allows eNB2 as this terminal, and certain the several community in eNB2 can be used as the situation of candidate target cells, can also be by increase an information unit (IE) in this message, comprised the index(s of the target candidate community under eNB2 in this IE) get final product.ENB2 reads this message thus, thereby just can recognize and allow the switching candidate target website of eNB2 as this terminal by this IE, and certain the several community in eNB2 can be used as the situation of candidate target cells, the index(s of the target candidate community that this candidate target cells information will comprise from this IE) obtain.
The mode of above-mentioned community ID index, be applicable in S1 or X2 message, especially or particularly, goes in handover request message.
For example be designated " 0 " and mean not allow the switching candidate target website of eNB2 as this terminal.
Below take this sign=" 1 " goes on to say the embodiment of the present invention as example.If this sign=" 1 ", eNB2 recognizes if RN1 can not receive in the situation of this terminal switching, can allow the switching candidate target website of eNB2 as this terminal.Therefore according to s own situation such as cell load etc., eNB2 considers whether can receive this terminal switching.
By this handover request message, by Un interface (interface between relay station and its serving BS), targeted sites RN1, RN2, the RN3 to the candidate sends in the switching candidate target list that eNB1 comprises in handover request message (having comprised a plurality of RN under this eNB2 is attached in list);
This switching candidate target list can also provide the priority of the plurality of RN as terminal switching candidate target website.
303, after the serving BS eNB2 of RN1 receives this handover request message, resolve this switching message, obtain the switching candidate target list information; A plurality of RN under this eNB2 is attached have been comprised in list.This switching candidate target list can also provide the priority of the plurality of RN as terminal switching candidate target website.
For the ease of the following describes conveniently, the handover request message that eNB2 is received from eNB1 is referred to as handover request A message. and it is handover request B message that eNB2 is sent to the handover request message of its websites subordinate RN.
304, eNB2 crosses targeted sites RN1, RN2, the RN3 transmission of Un interface (interface between relay station and its serving BS) to the candidate according to the switching candidate target list comprised in this handover request message (handover request A message .) (having comprised a plurality of RN under this eNB2 is attached in list) by the handover request information exchange of this terminal;
The first situation: according to the priority of switching candidate target list, single message ground for example sends handover request message, to the highest RN of list medium priority, the RN1 that priority is 1.If RN1 replys handoff failure, so just send again the relay station of handover request to list medium priority second, as RN3, by that analogy, until a relay of the recommendation in list has the reply switch acknowledgment message, or until in list all recommendation relay stations all reply switch failure information.If there is relay station to reply switch acknowledgment message, eNB2 forwards this switch acknowledgment message to source base station eNB1 so.
The second situation: eNB2 mass-sending handover request message is to the relay in list, and one or more relay is replied switching confirmation/switch failure information separately.ENB2 is according to the priority of the website of replying switch acknowledgment message, and the switch acknowledgment message that the high intra-site of priority is replied sends to source base station.
No matter the first or the second situation, above-mentioned eNB2 sends handover request message (handover request B message) to candidate target website (take RN1 as example), comprised terminal handover request information in this handover request message (handover request B message), with handover request A message, compare, only can comprise a Target cell or targeted sites information in this handover request message (handover request B message) (as target cell identifier [target cell ID, as ECGI], as targeted sites identifier (eNB ID or global eNB ID) etc.) rather than a candidate target cells list information.
Alternatively, eNB2 revises the corresponding eNB UE X2AP ID(s in handover request A and B message possibly) information (particularly, can be new eNB UE X2AP ID or old eNB UE X2AP ID), other parts remain unchanged.
Alternatively, eNB2 can also will come from the X2 handover request message content of eNB1, with the form of S1AP handover request message, sends to RN1, adopts the S1 protocol communication on the Un interface.
Below take all relay stations and reply switch failure information and describe as example.
If 305 all relay stations are replied switch failure information, eNB2 confirms that all recommendation relay stations all can not receive this terminal switching so;
If from the sign in eNB1 handover request message=" 1 ", so eNB2 according to s own situation as reasons such as loads, consider whether to can be used as the switching candidate target website of this terminal, if can receive this terminal switching, so just reply switch acknowledgment message, wherein, with self configuration information, please refer to step 306.If can not receive the terminal switching, reply so switch failure information.
If from the sign in eNB1 handover request message=" 0 ", eNB2 replys switch failure information to eNB1 so.
Below take and describe as example from the sign in eNB1 handover request message=" 1 ".
306, eNB2 sends switch acknowledgment message to eNB1.
If in the sign from eNB1 handover request message=" 1 ", eNB2 considers that s own situation is as reasons such as loads so, consider whether to can be used as the switching candidate target website of this terminal, if can receive this terminal switching, so just reply switch acknowledgment message, wherein, with self configuration information, this configuration information can be for example:
The configuration information of feedback is the situation by X2 interface:
The configuration information of this target BS self at least can comprise following one or more: new base station access protocol sign (New eNB UE X2APID); The RAB list (E-RABs Admitted list) of accepting, comprise especially E-RAB ID(E-UTRAN Radio Access Bearer ID wireless access bearing sign), the up GTP tunnel end points of UL GTP tunnel endpoint(UL GPRS Tunnelling Protocol tunnel endpoint), DL GTP tunnel endpoint(GPRS Tunnelling Protocol tunnel endpoint, descending GTP tunnel end points); Unacceptable RAB list (E-RABs not admitted list); Target BS is to the transmission container (target eNB to Source eNB Transparent Container) of source base station.
Said method embodiment UE of the present invention is switched in a plurality of relay station situations of eNB2 attached from a base station eNB 1, eNB2 recognizes if all RN can not receive in the situation of this terminal switching, can allow the switching candidate target website of eNB2 as this terminal, realized the terminal switching with less interacting message, efficiency is higher, and the occupied bandwidth resource is few.It should be noted that to be, above take be switched to the situation of RN of target BS as example and be introduced from a source base station, from the RN of a source base station, be switched to the situation of RN of target BS applicablely too, the embodiment of the present invention is not as limit.It should be noted that in addition, when if UE is switched to eNB2 from a base station eNB 1, handover request message is that request is switched to eNB2, eNB2 recognizes if self can not receive in the situation of this terminal switching, eNB2 can be by resolving handover request message, obtain a switching candidate target site list in this message, know that eNB2 can not be as switching during targeted sites, RN(s under it is attached) can be as the switching candidate target website of this terminal, if one of them RN agrees to accept in the situation of this terminal switching, terminal UE can be switched to the RN of this eNB2 under attached, realize the successful switch of terminal, this embodiment is similar to the above embodiments, repeat no more.
Embodiment tetra-:
As shown in Figure 4, for the embodiment of the present invention four terminal UE are switched to a plurality of relay station method schematic diagrames of eNB2 attached from a base station eNB 1, the method comprises:
401, the measurement report that the source base station eNB1 receiving terminal UE of UE reports;
402, after the measurement report that eNB1 reports according to this terminal UE determines to be switched, source base station eNB1 send handover request via base station eNB 2 to a plurality of candidate target websites, for example RN1, RN2, RN3, wherein in handover request message, comprised a switching candidate target list, comprised one or more RN(RN1, RN2, RN3 under this eNB2 is attached in list), and comprise eNB2.
This switching candidate target list can also provide the priority of the plurality of RN as terminal switching candidate target website.
403, after the serving BS eNB2 of RN1 receives this handover request message, resolve this switching message, obtain the switching candidate target list in this switching message, eNB2 sends handover request message according to the switching candidate target list parsed;
This switching candidate target list can also provide the plurality of RN and the eNB2 priority as terminal switching candidate target website.
The first situation:
ENB2 is at last (priority is minimum) of switching candidate target list.ENB2 is according to the priority of handoff list, single message ground send handover request message to the RN(of list medium priority the highest (as priority is 1) as RN1).If RN1 replys handoff failure, eNB2 just sends the relay station of handover request to list medium priority second more so, as RN3.By that analogy, until having, a website of the recommendation in list can receive this terminal switching.If one of them relay station is replied switch acknowledgment message, eNB2 just no longer sends handover request message to other relay stations so, and then eNB2 replys switch acknowledgment message to eNB1.Can not receive this terminal switching if there is no relay station, so eNB2 according to s own situation as reasons such as loads, judge whether to receive this terminal switching, if eNB2 can receive, reply so switching preparation acknowledge message, this switching is prepared in acknowledge message with self configuration information.If can not receive, eNB2 replys switch failure information so.
ENB2 can, when the single message of transmission is to the relay station higher than its priority, judges and self whether can receive the terminal switching, can more reduce time delay like this.
ENB2 is first (priority is the highest) of switching candidate target list.Whether eNB2 judges self can receive the terminal switching, if eNB2 can switch receiving terminal, reply so switch acknowledgment message, otherwise the priority according to list, the single message of eNB2 issue subordinate relay stations, as preferentially issued relay station that priority is time high as relay station RN1, if RN1 can't receive terminal, handoff failure is replied in switching, the relay station that eNB2 transmission handover request message is taken second place to priority so is as relay station RN3, by that analogy.Until there is relay station (as RN2) to reply switch acknowledgment message in list, eNB2 replies to the source base station switch acknowledgment message so.In this switch acknowledgment message with the configuration information of this RN2.
If eNB2 is in the centre of the priority of switching candidate target list, front have more low priority after higher priority is arranged.In a word that eNB2 is just passable as candidate's website consideration, no longer be repeated in this description.
The second situation:
ENB2 can mass-send handover request message to the website in list (this list comprises eNB2), and receive each website reply separately the switching confirmation/switch failure information.ENB2 is according to the priority of the website of replying switch acknowledgment message, and the switch acknowledgment message that the high intra-site of priority is replied sends to source base station eNB1.
Below take all relay stations higher than eNB2 priority and all reply switch failure information and describe as example.
If 404 all relay stations higher than eNB2 priority are all replied switch failure information, and eNB2 confirms himself to receive this terminal switching, and eNB2 sends switch acknowledgment message to eNB1.
Said method embodiment UE of the present invention is switched in a plurality of relay station situations of eNB2 attached from a base station eNB 1, eNB2 recognizes if all RNs higher than eNB2 priority all can not receive in the situation of this terminal switching, can allow the switching candidate target website of eNB2 as this terminal, realized the terminal switching with less interacting message, efficiency is higher, and the occupied bandwidth resource is few.It should be noted that to be, above take be switched to the situation of RN of target BS as example and be introduced from a source base station, from the RN of a source base station, be switched to the situation of RN of target BS applicablely too, the embodiment of the present invention is not as limit.It should be noted that in addition, when if UE is switched to eNB2 from a base station eNB 1, handover request message is that request is switched to eNB2, eNB2 recognizes if self can not receive in the situation of this terminal switching, eNB2 can be by resolving handover request message, obtain a switching candidate target site list in this message, know that eNB2 can not be as switching during targeted sites, RN(s under it is attached) can be as the switching candidate target website of this terminal, if one of them RN agrees to accept in the situation of this terminal switching, terminal UE can be switched to the RN of this eNB2 under attached, realize the successful switch of terminal, this embodiment is similar to the above embodiments, repeat no more.
Embodiment five:
Corresponding to said method embodiment, as shown in Figure 5, be the network node structure schematic diagram in the embodiment of the present invention five junction networks, described network node comprises:
Message sink unit 501, the handover request message sent for the reception sources base station, handover request message is switched to the first website for request by terminal;
Information acquisition unit 502, can be as the information of switching candidate target website for obtain network node from handover request message, and network node is higher level's website or subordinate's website of the first website;
Message sending unit 503, for disagreeing with when the first website as switching during targeted sites, send switch acknowledgment message to source base station, and the indication network node of usining is agreed as switching targeted sites.
The described subordinate of the present embodiment website is the relay forwarding node of higher level's website in junction network, for realizing the data relay between higher level's website and terminal, forwards.
Optionally, the first website can be base station, and the second website can be the first website subordinate's relay station.The second website can be base station, and the first website can be the second website subordinate's relay station.When network node is base station, the first website is network node subordinate's relay station, described information acquisition unit 502 can comprise: the identification (RNC-ID) analytic module, for resolving handover request message, obtain an identification information in handover request message, identification information has indicated the network node can be as the switching candidate target website; Perhaps the list parsing module, for resolving handover request message, obtain the switching candidate target site list in handover request message, and the switching candidate target site list comprises network node.
Optionally, message sending unit 503 can comprise: the first sending module, for to a plurality of the first websites, sending respectively handover request message, if receive the switch failure information of a plurality of the first website feedbacks, to source base station, send switch acknowledgment message, using and indicate the second website to agree as the switching targeted sites; Perhaps the second sending module, for to a plurality of first stop point mass-sending handover request message, if receive the switch failure information of a plurality of the first website feedbacks, send switch acknowledgment message to source base station, usings and indicate the second website to agree as the switching targeted sites.
Optionally, information acquisition unit 502 can also for the community of knowing the second website from handover request message can as the switching target community; Message sending unit 503 also can be as the community of switching target as switching target small area for by the transmission switch acknowledgment message, to source base station, indicating the second website to agree.
The above-mentioned network node embodiment of the present invention is providing higher level's website of targeted sites or the subordinate's website can be as the information of switching candidate target website when the targeted sites request is switched, if targeted sites is disagreed with switching, terminal can be switched to higher level's website or subordinate's website of targeted sites, realize the successful switch of terminal, realized the terminal switching with less interacting message, efficiency is higher, and the occupied bandwidth resource is few.
One of ordinary skill in the art will appreciate that all or part of step realized in above-described embodiment method is to come the instruction related hardware to complete by program, described program can be stored in a computer read/write memory medium, this program is when carrying out, comprise above-mentioned all or part of step, described storage medium, as: ROM/RAM, disk, CD etc.
Above-described embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only the specific embodiment of the present invention; the protection range be not intended to limit the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (11)
1. the changing method in a junction network, is characterized in that, described method comprises:
The handover request message that the reception sources base station sends, described handover request message is switched to the first website for request by terminal;
Obtaining described the second website from described handover request message can be as the information of switching candidate target website, higher level's website that described the second website is the first website or subordinate's website;
When the first website is disagreed with as the switching targeted sites, send switch acknowledgment message to described source base station, using and indicate described the second website to agree as the switching targeted sites;
Wherein, describedly obtain described the second website can comprise as the information of switching candidate target website from described handover request message:
Resolve described handover request message, obtain an identification information in described handover request message, described identification information has indicated described the second website can be as the switching candidate target website; Perhaps
Resolve described handover request message, obtain the switching candidate target site list in described handover request message, described switching candidate target site list comprises described the second website.
2. method as claimed in claim 1, is characterized in that, described the first website is base station, and described the second website is the first website subordinate's relay station.
3. method as claimed in claim 1, is characterized in that, described the second website is base station, and described the first website is the second website subordinate's relay station.
4. method as claimed in claim 3, is characterized in that, described the first website has a plurality of;
Described when the first website is disagreed with as the switching targeted sites, to described source base station transmission switch acknowledgment message, using and indicate described the second website to agree to comprise as the switching targeted sites:
Send respectively described handover request message to described a plurality of the first websites, if receive the switch failure information of described a plurality of the first website feedbacks, to described source base station, send switch acknowledgment message, using and indicate described the second website to agree as the switching targeted sites; Perhaps
To the described handover request message of described a plurality of first stop point mass-sending, if receive the switch failure information of described a plurality of the first website feedbacks, to described source base station, send switch acknowledgment message, using and indicate described the second website to agree as the switching targeted sites.
5. method as claimed in claim 4, is characterized in that, describedly sends respectively described handoff request message to described a plurality of the first websites and draw together:
According to the precedence information of a plurality of the first websites that carry in described handover request message, to a plurality of the first websites, send successively described handover request message.
6. as method as described in claim 3 or 4 or 5, it is characterized in that, also comprise: from described handover request message, knowing can be as the community of switching target in the community of the second website; Described switch acknowledgment message also indicated described the second website agree will be described can be as the community of switching target as switching target small area.
7. method as claimed in claim 6, it is characterized in that, in the described community of knowing the second website from described handover request message, can comprise as the community of switching target: obtain cell index from described handover request message, described cell index has been indicated can be as the community of switching target in the community of the second website.
8. the network node in a junction network, is characterized in that, comprising:
The message sink unit, the handover request message sent for the reception sources base station, described handover request message is switched to the first website for request by terminal;
Information acquisition unit, can be as the information of switching candidate target website for from described handover request message, obtaining described network node, and described network node is higher level's website or subordinate's website of the first website;
Message sending unit, for disagreeing with when the first website as switching during targeted sites, send switch acknowledgment message to described source base station, usings and indicate described network node to agree as switching targeted sites;
Wherein, described information acquisition unit comprises:
The identification (RNC-ID) analytic module, for resolving described handover request message, obtain an identification information in described handover request message, and described identification information has indicated the described network node can be as the switching candidate target website; Perhaps
The list parsing module, for resolving described handover request message, obtain the switching candidate target site list in described handover request message, and described switching candidate target site list comprises described network node.
9. network node as claimed in claim 8, is characterized in that, described network node is base station, and described the first website is described network node subordinate's relay station.
10. as network node as described in claim 8 or 9, it is characterized in that, described message sending unit comprises:
The first sending module, for to a plurality of the first websites, sending respectively described handover request message, if receive the switch failure information of described a plurality of the first website feedbacks, to described source base station, send switch acknowledgment message, using and indicate described the second website to agree as the switching targeted sites; Perhaps
The second sending module, for to a plurality of first stop points, mass-sending described handover request message, if receive the switch failure information of described a plurality of the first website feedbacks, to described source base station, send switch acknowledgment message, using and indicate described the second website to agree as the switching targeted sites.
11. network node, is characterized in that as claimed in claim 9, described information acquisition unit also for the community of knowing the second website from described handover request message can as the switching target community; Described message sending unit also for by send switch acknowledgment message to described source base station indicate described the second website agree will be described can be as the community of switching target as switching target small area.
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| CN101345987A (en) * | 2007-07-12 | 2009-01-14 | 华为技术有限公司 | Method and base station for implementing fast switch-over in communication network |
| CN101345986A (en) * | 2007-07-12 | 2009-01-14 | 华为技术有限公司 | Processing method and base station for switching failure in communication network |
| EP2086253A1 (en) * | 2008-02-04 | 2009-08-05 | Alcatel Lucent | Method and apparatus for radio link failure recovery in a wireless communications network |
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