CN101150840B

CN101150840B - Method and device for switching mobile relay station and its affiliated mobile station

Info

Publication number: CN101150840B
Application number: CN2006101163444A
Authority: CN
Inventors: 张凯宾; 刘继民; 金珊; 邹伟
Original assignee: Alcatel Lucent Shanghai Bell Co Ltd
Current assignee: Nokia Shanghai Bell Co Ltd
Priority date: 2006-09-20
Filing date: 2006-09-20
Publication date: 2010-08-11
Anticipated expiration: 2026-09-20
Also published as: CN101150840A

Abstract

The invention provides a switching method for realizing quick combined access point switching in a mobile relay station and a mobile terminal thereof in a wide band radio access network. The mobile terminal is accessed through the mobile relay station, the method comprises following steps: a) the mobile terminal is switched to access through a middle access point; b) the mobile relay station is switched to access from a source access point to a target access point; c) the mobile terminal is switched to access from the middle access point to the mobile relay station. The invention also provides corresponding devices and base stations for the method.

Description

Be used to switch the method and the device of mobile-relay station and subordinate's portable terminal thereof

Technical field

The present invention relates to cordless communication network, the access point that relates in particular to mobile-relay station in the wireless relay network and subordinate's portable terminal thereof switches.

Background technology

Fig. 1 can be used in to realize a schematic diagram that comprises the radio bandwidth access network of mobile-relay station and subordinate's portable terminal thereof of the present invention.Shown in network comprise a plurality of base stations, a plurality of relay station and a plurality of portable terminal, for simplicity's sake, base station 1, base station 2, relay station a-d, mobile-relay station e (being inserted by base station 1), portable terminal I (being inserted by mobile-relay station e), portable terminal II (directly being inserted by base station 1) and a portable terminal III (being inserted by relay station a/ relay station b) who is placed on the mobile object (for example train, automobile) only are shown among the figure.

In wireless access network as shown in Figure 1, between base station and each portable terminal wireless connections structure of a kind of point to multiple spot.The base station is except that the allocation manager of being responsible for air traffic channel with to the mobile terminal access control, also provides wired or wave point is used to connect backbone network.Relay station is connected with portable terminal with the base station respectively by wireless air interface between base station and portable terminal.Under the control of base station, carry out data communication between relay station and the portable terminal, can improve the signal quality of going up (descending) line link effectively, increase throughput greatly.

According to mobility, relay station can be divided into following three classes: fixed relay station (Fixed RelayStation, FRS), nomadic relay station (Nomadic Relay Station, NRS) and mobile-relay station (Mobile Relay Station, MRS).Be readily appreciated that fixed relay station is not because the access point switching can take place self fixed-site.Hereinafter, access point refers to provide for portable terminal or relay station the network equipment of access, and it can be a base station or relay station, and base station 1 is the access point of portable terminal II among Fig. 1.Especially, the access point before switching is called the source access point, the access point after the switching is called target access.Though nomadic relay station has certain mobility, but it just is in " start " state (at this moment when only providing relay services in being placed in network and for base station and portable terminal, nomadic relay station can be regarded as an interim fixed relay station), when it is mobile between access point, then be in " shutdown " state.Therefore, just do not exist the portable terminal being responsible for inserting by nomadic relay station because the mobile situation that causes transmission delay even communication disruption of nomadic relay station.

Mobile-relay station (mobile-relay station e as shown in Figure 1) then because when work moves in wireless network, often need switch between diverse access point.Typical mobile-relay station can be placed on the public transports such as automobile, train, and the portable terminal that is positioned on such vehicles can communicate via mobile-relay station and base station.The wireless accessing network structure of this use mobile-relay station can improve the signal quality in the moving vehicle, strengthens the throughput of each portable terminal in the vehicles.

Support for the mobility of portable terminal is one of key characteristic of wireless network, and in the wireless network of supporting relay station, portable terminal may move between the different base stations, between between the different relay station or relay station and the base station.The generally speaking access point of portable terminal switching (hereinafter to be referred as switching) can be divided three classes, the first kind is that get involved at non-relay station, occur in two between the base station switching (as, the portable terminal II that reason base station 1 shown in Fig. 1 is directly inserted switches to when mobile by base station 2 and directly inserts), this situation belongs to conventional access point and switches, existing multiple implementation in the prior art, and corresponding regulation is also arranged in standard.

Second class is the switching that has fixed relay station or nomadic relay station to participate in, though the participation of relay station is arranged in this switching but relay station only plays the effect of relay data business and control information in whole process, himself does not switch, and what really switch has only portable terminal.For instance, suppose that relay station a, b, c, the d among Fig. 1 is fixed relay station or nomadic relay station, the portable terminal III that reason relay station a inserts switches to when mobile by relay station b and inserts.To this switching, can be referring to the description of the applicant in the related application of submitting on April 26th, 2006 (application number 200610026180.6).

It is the switching that has mobile-relay station to participate in that the 3rd class is switched, and the access point that this type of switching comprises mobile-relay station and two kinds of equipment of portable terminal switches.For example, 1 coverage moves to the coverage of base station 2 to the train of being furnished with mobile-relay station e among Fig. 1 from the base station.At this moment, mobile-relay station e just need switch, and the portable terminal I that is just inserting by this mobile-relay station e does not wish to cause extra delay even communication disruption because of the described switching of mobile-relay station e.As seen, because the switching of the relay station under this situation also must be considered its subordinate's communications of Mobile Terminals continuity problem, so more preceding two classes of its handover mechanism are switched complicated more.

At present, switch, still do not have ripe implementation in the prior art for above-mentioned the 3rd class.Therefore, need a kind of effective solution, realize the associating of mobile-relay station and subordinate's portable terminal thereof, switching fast.

Summary of the invention

Proposition of the present invention is just in order to provide the technical scheme of uniting switching of a kind of effective support mobile-relay station and subordinate's portable terminal thereof.

According to an aspect of the present invention, provide a kind of changing method of portable terminal, described portable terminal inserts by a mobile-relay station, may further comprise the steps: a) described portable terminal switches to by a middle access point and inserts; B) described mobile-relay station inserts from being inserted to switch to by a target access by a source access point; And c) described portable terminal inserts from being inserted to switch to by described mobile-relay station by access point in the middle of described.

According to a further aspect in the invention, a kind of switching control (10) of portable terminal also is provided, described portable terminal inserts by a mobile-relay station, comprising: first control device (101) is used for control described portable terminal is switched to by a middle access point access; Second control device (102) is used to control described mobile-relay station and inserts from being inserted to switch to by a target access by a source access point; And the 3rd control device (103), be used to control described portable terminal and insert to switch to by access point in the middle of described and insert by described mobile-relay station.

According to a further aspect in the invention, a kind of base station also is provided, the switching control (10) that comprises a portable terminal, described portable terminal inserts by a mobile-relay station, described switching control (10) comprising: first control device (101) is used for control described portable terminal is switched to by a middle access point access; Second control device (102), being used to control described mobile-relay station inserts from being inserted to switch to by a target access by a source access point, and the 3rd control device (103), be used to control described portable terminal and insert to switch to by access point in the middle of described and insert by described mobile-relay station.

According to a further aspect in the invention, a kind of mobile-relay station of switching supported is provided, its subordinate's portable terminal inserts the source access point by this mobile-relay station, described mobile-relay station comprises: source access point transceiver is used to receive from the message of described source access point or to described source access point transmission message; The portable terminal transceiver is used to receive from the message of described portable terminal or to described mobile terminal to send message; Transmit processing unit, be used between described source access point transceiver and described portable terminal transceiver, transmitting message; And switch processing device, be used for according to search described source adjacency of access points access point, described mobile-relay station is inserted from being inserted to switch to by a target access by a source access point.

According to the present invention, can quickly and easily when mobile-relay station is carried out switching, guarantee the continuous communiction of subordinate's portable terminal of this relay station.

Description of drawings

By the description of non-limiting example being done below in conjunction with accompanying drawing, characteristics of the present invention and advantage will be more clear.

Fig. 1 can be used in to realize a schematic diagram that comprises the radio bandwidth access network of mobile-relay station and subordinate's portable terminal thereof of the present invention;

Fig. 2 controls the method flow diagram that mobile-relay station and subordinate's portable terminal thereof switch for source base station under the situation that is the base station according to source access point and the target access of a specific embodiment of the present invention;

Fig. 3 shows in detail in the changing method of the specific embodiment of the invention shown in Figure 2 and finishes employed each message of each step;

Fig. 4 is for being used to control the switching control block diagram that mobile-relay station and subordinate's portable terminal thereof switch in the source base station under the situation that is the base station according to the source access point and the target access of a specific embodiment of the present invention; And

Each message that Fig. 5 uses when showing in detail under the situation that is the base station according to the source access point of another embodiment of the present invention and target access mobile-relay station and subordinate's portable terminal thereof being switched.

Fig. 6 shows the mobile-relay station block diagram according to a specific embodiment of the present invention.

Embodiment

Several situations that mobile-relay station and subordinate's portable terminal thereof switch

Please refer to Fig. 1, when the vehicles that are equipped with mobile-relay station e are mobile in this wireless access network, (have a plurality of portable terminals in the vehicles this moment for mobile-relay station e and subordinate's portable terminal I thereof, they insert by mobile-relay station e, for simplicity's sake, be example with portable terminal I) switching just may relate to following situation:

A. in same base station range, switch, specifically be divided into following 3 kinds of situations:

■ in same base station range, the switching from the base station to the relay station;

■ in same base station range, the switching from the relay station to the base station;

■ in same base station range, the switching from relay station to another relay station;

B. in the coverage of different base station, switch, specifically be divided into following 4 kinds of situations:

The switching of ■ from the source base station to the target BS;

The switching of the relay station of ■ within from source base station to the target BS coverage;

The switching of ■ from the relay station in the source base station coverage to target BS;

The switching of the relay station of ■ in from the relay station in the source base station coverage to the target BS coverage.

Wherein, to directly or by subordinate's relay station provide the base station/relay station of access to be called source base station/source relay station before switching, and will be after switching directly or by subordinate's relay station provide the base station/relay station of access to be called target BS/relay station for mobile-relay station e and subordinate's portable terminal I thereof for mobile-relay station e and subordinate's portable terminal I thereof.Be the source access point directly before switching for mobile-relay station e and subordinate's portable terminal I thereof provide the base station/relay station of access; Correspondingly, switching the back is target access for mobile-relay station e and subordinate's portable terminal I thereof provide the base station/relay station of access directly.

The prerequisite of switching

An Important Thought of the present invention is, mobile-relay station carry out access point switch before (more specifically, before mobile-relay station carries out the access point search), the portable terminal of being responsible for inserting by this mobile-relay station is switched to by a middle access point access, to guarantee the business continuance of this portable terminal, avoid extra professional transmission delay.

1) portable terminal I (for example, the mobile phone of a passenger on the train at mobile-relay station e place) or mobile-relay station e can switch the frequency of the receiver of oneself at set intervals, come search base station 1 other base station in addition (to be generally the adjacent base station of base station 1, comprise the base station 2 shown in Fig. 1) downstream signal (also promptly carry out access point search, described downstream signal such as lead code), and comparison is from the signal strength signal intensity of the broadcast singal of each base station that comprises base station 1, when from the intensity of the signal of base station 1 with compare from the intensity of the adjacent signal of base station in certain and base station 1 when enough poor, portable terminal I or mobile-relay station e decision are switched, and upwards send access point handoff request message, wherein, the access point search request message sent out of portable terminal I is transmitted by mobile-relay station e;

2) operation of portable terminal I or mobile-relay station e transmission access point search request message can be by the access point search trigger message trigger from base station 1, and described access point search trigger message is sent under following any situation by base station 1.Should be appreciated that base station 1 sends described access point search trigger message and is not limited to following situation:

A. base station 1 periodic broadcast access point search trigger message receives that the portable terminal I (preferably, also having mobile-relay station e) of this message will upwards send the access point searching request.Equally, the described access point searching request sent out of portable terminal I is transmitted by mobile-relay station e;

B. significant information of channel quality such as link signal to noise ratio (snr) between base station 1 monitoring and its subordinate's mobile-relay station/portable terminal, (first predetermined value when signal to noise ratio is reduced to a predetermined value, this moment, base station 1 can not provide enough good signal for this mobile-relay station/portable terminal), just send access point search trigger message to corresponding mobile relay station/portable terminal;

C. base station 1 relatively and the link circuit condition between each adjacent base station of the link circuit condition between the portable terminal I and portable terminal I and base station 1, if the former with the latter is compared when enough poor, base station 1 promptly sends access point search trigger message to mobile-relay station e and subordinate's portable terminal I thereof.Preferably, described mobile-relay station e and affiliated portable terminal I thereof are notified with the relevant information of target BS in base station 1 after determining target BS, are used to carry out the access point search;

3) in addition, when the overload of base station 1 when (its load surpasses a predetermined threshold), be balanced load, base station 1 the load balancing desired parameters (as, the number of users that need to switch etc.) determine after, send access point search trigger message to corresponding mobile terminal/mobile-relay station.

Before address, the uniting to switch of mobile-relay station e and subordinate's portable terminal I thereof relates to multiple switching situation, is that example is discussed with the switch instances between the base station below.Should be appreciated that the present invention stands good when having at least one to be relay station in source access point or the target access.

Fig. 2 controls the method flow diagram that mobile-relay station and subordinate's portable terminal thereof switch for source base station under the situation that is the base station according to source access point and the target access of a specific embodiment of the present invention.In the present embodiment, described source access point is base station 1, and middle access point also is base station 1 (or its subordinate's relay station), and with reference to Fig. 1, correspondingly, mobile-relay station is the mobile-relay station e among Fig. 1, and portable terminal is portable terminal I shown in Figure 1.This method originates in step S10.

In step S10, receive the access point search request message of sending by mobile-relay station e as the base station 1 of source access point.

In step S11, access point in the middle of base station 1 is determined is as the interim access point of portable terminal I before mobile-relay station e carries out the access point switching.Access point both can be base station 1 itself in the middle of described, also can be the direct or indirect subordinate's relay station in base station 1, can also be the adjacent base station (as base station 2) of base station 1 or direct or indirect subordinate's relay station of its adjacent base station.Usually, described middle access point can be determined according to following parameter in base station 1:

The signal strength measurement report that each relay station of the subordinate of ■ base station 1 is sent or this signal of forwarding are used to make base station 1 to be directly acquainted with or by analysis and then understand, arrive the signal strength signal intensity of each road signal of this relay station via each bar link.Particularly, following operation is carried out in base station 1: receive via each bar link and arrive described each road signal strength signal intensity of signal strength signal intensity → analysis of the multiple signals of mobile-relay station → according to signal strength measurement report, determine stronger signal, ignore the more weak signal of signal strength signal intensity;

■ base station 1 detected its without in the signal strength signal intensity that directly receives from described mobile-relay station e (data service of considering portable terminal I is by mobile-relay station e relaying) then;

Link circuit condition between each adjacent base station of link circuit condition between ■ base station 1 and the portable terminal I and portable terminal and base station 1.

Preferably, the access point of best quality of service is determined to provide by the information that includes but not limited to above content is analyzed in base station 1, as access point in the middle of described.In preferred implementation of the present invention, being that example describes as middle access point with source base station 1.

Alternatively, can be in the base station 1 place prestore in the middle of the characteristic information of access point, as, access point is base station 1 (or base station 2) in the middle of preestablishing.In the case, step S11 is optionally, promptly when base station 1 has prestored the characteristic information of middle access point, can be without step S11, but after in step S10, receiving described access point search request message, directly read the middle access point that prestores, and enter step S12.

Before address, Important Thought of the present invention is to guarantee that portable terminal met with excessive transmit delay or communication disruption for it provides the mobile-relay station of the access Shi Buhui that switches originally.And, the access point search request message of sending as this mobile-relay station of base station 1 response e (MOBSCN_REQ) and after it sent access point search response message (MOB SCN_RSP), mobile-relay station e will begin the access point search.Because the access point search needs to consume the time greater than a frame length (may reach 3 frame lengths even more), the transmitter and receiver of mobile-relay station e occupied (it only has a pair of transceiver usually) during this period of time, can't communicate by letter with portable terminal I, this can bring extra delay even communication disruption for portable terminal I, thereby can't guarantee the communication quality of portable terminal I.

Therefore, need be before mobile-relay station e begins access point search---base station 1 send access point search response message to mobile-relay station e before, the access point of finishing portable terminal I switches, and switches to by middle access point and inserts.

Particularly, when this centre access point is base station 1 or its direct/indirect subordinate's relay station, in step S12, base station 1 sends ranging response message (RNG_RSP) or portable terminal I is given in power control mode switch response (PMC_RSP), adjusts the transmitting power of portable terminal I so that it adapts to the transmission range of new transmission link.Equally, for adapting to this centre access point (must be different from mobile-relay station e), also to adjust the synchronism deviation of portable terminal I, specifically can be by sending UCD (upstream channel descriptor)/DCD (down channel descriptor) to it by base station 1, UL MAP (up channel mapping)/DL MAP (down channel mapping) realizes.So far, portable terminal I can be by directly or via other relay station (non-moving relay station e) having communicated by letter with base station 1.Finished it to the switching that inserts by middle access point.

In step S13 after this, base station 1 sends access point search response message (MOBSCN_RSP) and gives mobile-relay station e, wherein comprises the relevant parameter that carries out the access point search, as searches for used Radio Resource etc.So mobile-relay station e begins to carry out access point search, for example, the lead code of each adjacent base station of search base station 1 is also analyzed its intensity, determines whether and will switch in conjunction with the signal strength signal intensity between itself and the base station 1.What deserves to be mentioned is that relay station can be identified by MAC Address or other identification method in base station 1, so that itself and portable terminal are made a distinction and treat especially.If mobile-relay station e is through after comparing the result who inserts point search, think and to switch, then can send access point handoff request message to base station 1, wherein comprise the characteristic information of the mobile-relay station e possible target BS that comparison gets according to the access point Search Results, these possible target BS can provide preferable quality of service for mobile-relay station e.

In step S14, base station 1 judges whether to receive the access point handoff request message (MOB MSHO_REQ) from mobile-relay station e, usually, certain hour can be waited in base station 1 after sending access point search response message, and whether to receive described access point handoff request message in the period at this section as criterion.If receive described access point handoff request message, prove that mobile-relay station e will switch, then enter step S 15, otherwise, illustrate that mobile-relay station e does not need to switch, enter step S15 '.

If after this base station 1 does not receive the access point handoff request message from mobile-relay station e, then in step S15 ', by with step S12 in opposite operation, control portable terminal I is switched back by mobile-relay station e by this centre access point access and inserts.Particularly, base station 1 sends ranging response message (RNG_RSP) or portable terminal I is given in power control mode switch response (PMC_RSP), and the transmitting power of adjusting the latter is to adapt to the transmission range of new transmission link (portable terminal → mobile-relay station e).Equally, insert for adapting to again by this mobile-relay station e, also will adjust the synchronism deviation of portable terminal I, concrete by sending UCD (upstream channel descriptor)/DCD (down channel descriptor) to it, UL MAP (up channel mapping)/DL MAP (down channel mapping) realizes.So far, mobile-relay station e and subordinate's portable terminal I thereof have recovered original access state.

If base station 1 receives the access point handoff request message from mobile-relay station e, then in step S15, send pre-switch notification request message (HO pre-notification REQ) and give at least one adjacent with it base station (for example, and in step S16, receive pre-switch push-notification-answer message (HO pre-notification RSP) corresponding described possible target BS in this access point handoff request message), from least one adjacent with it base station.Wherein, preferably, pre-switch push-notification-answer message returns to described base station 1 by corresponding base station after information such as self radio resource situation are analyzed.

In step S17, the target access that mobile-relay station e switches is determined in base station 1, according to a specific embodiment of the present invention, determines that target access that relay station e switches is a base station adjacent with base station 1.In another example, target access can be subordinate's relay station of another base station adjacent with base station 1.About how determining a such relay station, the associated documents of the aforementioned application that can submit referring to the applicant, therein, will be by the base station in the current area at relay station place, analyze to determine whom is responsible for the access of this mobile-relay station e by by the signal quality reporting (or signal of transmitting) and the signal quality that oneself directly receives of each road signal that each neighbor base station and relay station thereof are reported.Equally, can switch to insert by adjacent base station as the base station 1 of middle access point after, again the link signal quality that reports according to each relay station of its subordinate by this adjacent base station with and and portable terminal I between the signal quality of direct communication judge whether relaying, relaying how.

In conjunction with the present invention and described in first to file, those of ordinary skill in the art can realize that described mobile-relay station e switches to the operation that the subordinate's relay station by an adjacent base station of base station 1 inserts without any creative work.Need emphasize once more that the switching of the switching of mobile-relay station e and a common mobile terminal is basic identical, just can discern this relay station according to MAC Address or other identification method of mobile-relay station as the base station of source access point.

Then, in step S18, base station 1 sends access point switching response message (MOBBSHO_RSP) and gives mobile-relay station e, informs that it can switch and the relevant information of target access.

In step S19, base station 1 receives the switching indication (MOBHO_IND) from mobile-relay station e, and so far base station 1 has been finished it and switched to by the task in the target BS access procedure at mobile-relay station e.Then, mobile-relay station e transmission distance measurement request (RNG_REQ) and register requirement (REG_REQ) respond (REG_RSP) to ranging response (RNG_REQ) and the registration that target BS also receives from this target BS.So far, mobile-relay station e has finished by source access point (base station 1) and has been linked into by target access (adjacent base station 2 of the base station 1 as shown in Figure 1) access of determining in step S17.

The access situation of this moment is be in the portable terminal I that moves middle train inside shown in Figure 1 and directly inserted by base station 1, and mobile-relay station e to be inserted by base station 2.Preferably, insert from directly inserting to switch to by base station 1 control portable terminal I again by mobile-relay station e by base station 1.Described switching realizes by following process:

In step S110, base station 1 receives from the access point search request message that switches to the portable terminal I that is directly inserted by base station 1.Because the signal strength signal intensity by the downstream signal that mobile-relay station e transmits will be better than the directly signal strength signal intensity of 1 downstream signal that receives from the base station of portable terminal I this moment, therefore, portable terminal I initiatively sends described access point search request message, and need not be triggered by base station 1.

In step S111, base station 1 sends access point search response message to portable terminal I, wherein comprises information such as access point search desired parameters.After this portable terminal I carries out the access point search.Preferably, portable terminal I can carry out described access point search before mobile-relay station e finishes above-mentioned switching.More preferably, characteristic information that comprise or the corresponding base station that base station 1 is determined voluntarily is notified to portable terminal I in the access point scout report message that mobile-relay station e carries out sending after the access point search before this before portable terminal I carries out described search of base station 1, so that portable terminal I carries out described access point search targetedly.

Portable terminal I is through the access point search, compare downstream signal intensity from base station 1 and each adjacent base station thereof, if from the signal strength signal intensity of base station 1 enough by contrast a little less than, then portable terminal I switches selection, and, wherein comprise the characteristic information of the possible handover-target base station of comparison gained to base station 1 transmission access point handoff request message.Preferably, base station 1 is notified to access point Search Results or the target access characteristic information of mobile-relay station e under the prerequisite of portable terminal I in advance, and portable terminal will only be searched for the lead code of notified corresponding base station; More preferably, 1 characteristic information with described target BS in base station is notified this portable terminal I, then its can only search for this target BS and and base station 1 carry out signal strength signal intensity comparison.

In step S112, base station 1 judges whether to receive the access point handoff request message from portable terminal I.If receive described access point handoff request message, then enter step S113; Otherwise, get back to step S110, receive next access point search request message from this portable terminal I.

In step S113, base station 1 sends the pre-switch notification request message to corresponding adjacent base station, and receives the pre-switch push-notification-answer from described target BS in step S114.

In step S115, base station 1 sends access point switching response message (MOBBSHO_RSP) and gives portable terminal I.In step S116, receive the switching indication (MOB HO_IND) from portable terminal I again, expression portable terminal I determines and will switch.So far, mobile-relay station e and subordinate's portable terminal I thereof have finished from be linked into the switching by the adjacent base station access of base station 1 by base station 1.Because in the handoff procedure of mobile-relay station, portable terminal is all inserted by other effective access points (source base station/adjacent base station (as target BS)/source base station subordinate relay station/adjacent base station subordinate relay station), has guaranteed the proper communication of portable terminal I.

Preferably, in order to reduce complexity, for belonging to the switching of unshowned other portable terminal of Fig. 1 under the mobile-relay station e control together with portable terminal I, can in mobile-relay station, dispose one and switch agent apparatus, one side is switched relevant information in order to memory mobile terminal with the sub-district, as CID, MAC Address, service feature or the like, can before entering switching state, finish portable terminal the part cell handover operations of portable terminal on the other hand, upgrade as CID, the CID mapping relations are upgraded, re-authentication, key updating, capability negotiation (capacity negotiation) and to the network registry portable terminal etc., to reach the purpose of quickening handoff procedure.

Should be appreciated that the context between each step shown in Fig. 2 is an example.For example, the access point search operation done of portable terminal I can not finished before mobile-relay station e is accomplished to the access of target access as yet yet.

Like this; those skilled in the art will readily appreciate that, if mobile-relay station carry out any will influence its subordinate's communications of Mobile Terminals before, portable terminal is switched to other access points; just can realize purpose of the present invention, thereby fall into protection scope of the present invention.Therefore, under above-mentioned prerequisite, the order of carrying out the concrete steps of mobile-relay station switching and portable terminal switching is not construed as limiting the invention.

Fig. 3 shows in detail and finishes employed each message of each step in the changing method shown in Figure 2.Because its main contents have been done detailed description in the description in conjunction with Fig. 2, therefore repeat no more.

Fig. 4 is under the situation that is the base station according to the source access point and the target access of a specific embodiment of the present invention, is used to control the block diagram of the switching control that mobile-relay station and subordinate's portable terminal thereof switch in the current area base station 1 at mobile-relay station and subordinate's portable terminal place thereof.Be described below in conjunction with Fig. 4 and with reference to Fig. 1, in the present embodiment, middle access point is that source base station is base station 1.This switching control 10 comprises first control device 101, second control device 102 and the 3rd control device 103.Preferably, this switching control 10 also comprises the 4th control device 104.Below describe this switching control 10 in detail.

First receiving device 1020 in the second control device 102 receives the access point search request message of being sent by mobile-relay station e.

Determine device 1010 definite middle access points by first in the first control device 101, as the interim access point of portable terminal I before mobile-relay station e switches.Access point both can be base station 1 itself in the middle of described, also can be the direct or indirect subordinate's relay station in base station 1, can also be the adjacent base station (as base station 2) of base station 1 or direct or indirect subordinate's relay station of this adjacent base station.In the present embodiment, be that the source access point is that the situation of base station 1 is an example with this centre access point.Usually, first definite device 1010 can be determined described middle access point according to following parameter:

■ base station 1 detected its without in the signal strength signal intensity of the signal that directly receives from described mobile-relay station e (data service of considering portable terminal I is by mobile-relay station e relaying) then;

Preferably, first determines that device 1010 is by analyzing the information that includes but not limited to above content, determine to provide the access point of best quality of service,, and notify first dispensing device 1011 access point in the middle of determined as access point in the middle of described.

Alternatively, the characteristic information of access point in the middle of can in a storage device (not shown), prestoring, as, access point is base station 1 in the middle of preestablishing.When base station 1 had prestored the characteristic information of middle access point, first determined that device 1010 can economize.

Before address, Important Thought of the present invention is to guarantee that portable terminal met with excessive transmit delay or communication disruption for it provides the mobile-relay station of the access Shi Buhui that switches originally.And, the access point search request message of sending as this mobile-relay station of base station 1 response e (MOBSCN_REQ) and after it sent access point search response message (MOB SCN_RSP), mobile-relay station e will begin the access point search.Because the access point search needs to consume the time greater than a frame length (may reach 3 frame lengths even more), the transmitter and receiver of mobile-relay station e occupied (it only has a pair of transceiver usually) during this period of time, can't be mutual with portable terminal I, this can bring extra delay and even communication disruption for portable terminal I, thereby can't guarantee the communication quality of portable terminal I.

Therefore, need be before mobile-relay station e begin the access point search (before base station 1 transmission access point search response message is to mobile-relay station e), the access point of finishing portable terminal I switches to middle access point.

Particularly, when this centre access point is base station 1 or its direct/indirect subordinate's relay station, send ranging response message (RNG_RSP) or power control mode switch response (PMC_RSP) by first dispensing device 1011 in the first control device 101 and give portable terminal I, adjust the latter's transmitting power so that it adapts to the transmission range of new transmission link.Equally, for making it adapt to this centre access point (must be different from mobile-relay station e), also to adjust the synchronism deviation of portable terminal I, specifically can realize by sending UCD (upstream channel descriptor)/DCD (down channel descriptor), UL MAP (up channel mapping)/DL MAP (down channel mapping) to it.So far, portable terminal I can be by directly or via other relay station (non-moving relay station e) having communicated by letter with base station 1.The state notifying second control device 102 that access point switched in the middle of the switching of access point in the middle of promptly being accomplished to, first control device 101 had been finished portable terminal I.

After receiving that portable terminal I has finished the message of middle access point switching, second dispensing device 1021 in the second control device 102 sends access point search response message (MOBSCN_RSP) and gives mobile-relay station e, wherein comprise the relevant parameter that carries out the access point search, as search for used Radio Resource etc.So mobile-relay station e begins to carry out the access point search, for example, receive the lead code of each adjacent base station of base station 1, and analyze its intensity.What deserves to be mentioned is that relay station can be identified by MAC Address or other message mechanism of each relay station in base station 1, so that itself and portable terminal are made a distinction and treat especially.

After this, mobile-relay station e carries out the access point search, and to base station 1 transmission access point handoff request message (MOB MSHO_REQ, or title access point scout report message, comprise the possible switching target that mobile-relay station e relatively gets according to the access point Search Results), in base station 1, this handoff request is received by the first receiving device in the second control device 102 1020.

Then, judge whether to receive access point search request message (MOB MSHO_REQ) from portable terminal e by first judgment means 1021, first receiving device 1020 will be notified first judgment means 1021 after receiving this access point search request message.Usually, first judgment means 1021 can be waited for certain hour after sending access point search response message, and whether to receive described access point handoff request message in the period at this section as criterion.If receive described access point handoff request message, prove that mobile-relay station e will switch, then judged result is passed to second dispensing device 1022; Otherwise, illustrate that mobile-relay station e does not need to switch, judged result is passed to the 4th control device 104.

If judged result is not for receiving described access point handoff request message, then by the 4th control device 104 by carry out with first control device 101 in opposite operation, control portable terminal I is switched back by this mobile-relay station e by this centre access point (base station 1) access and inserts.Particularly, the 4th control device 104 sends ranging response message (RNG_RSP) or portable terminal I is given in power control mode switch response (PMC_RSP), and the transmitting power of adjusting the latter is to adapt to the transmission range of new transmission link.Equally, insert for adapting to again by this mobile-relay station e, also to adjust the synchronism deviation of portable terminal I, specifically realize by sending UCD (upstream channel descriptor)/DCD (down channel descriptor), UL MAP (up channel mapping)/DL MAP (down channel mapping) to it.So far, mobile-relay station e and subordinate's portable terminal I thereof have recovered original access state.

If judged result first receiving device 1020 receives described access point handoff request message, then by second dispensing device 1022 send pre-switch notification request message (HO pre-notificationREQ) give the adjacent base station at least one and base station 1 (as, the possible target BS of indicating in the access point handoff request message), and by first receiving device 1020 receive pre-switch push-notification-answer message from least one adjacent with it base station.Wherein, preferably, pre-switch push-notification-answer message returns to described base station 1 by corresponding base station after information such as self radio resource situation are analyzed.

Described second control device 102 comprises that also second determines device 1023, is used for after the pre-switch push-notification-answer message that receives from least one adjacent with it base station, determines the target access that mobile-relay station e switches.According to a specific embodiment of the present invention, determine that target access that relay station e switches is a base station 2 adjacent with base station 1.In another example, target access can be subordinate's relay station of another base station adjacent with base station 1.

Then, (MOBBSHO_RSP gives mobile-relay station e to send the access point switching response message by second dispensing device 1022.

First receiving device 1020 receives the switching indication (MOBHO_IND) from mobile-relay station e, thereby the switching controls step of being responsible for by it to mobile-relay station e has been finished in base station 1.After this, mobile-relay station e by and base station 2 between processes such as range finding, registration finish by source access point (base station 1) and be linked into the access of determining the target access (such as adjacent base station 2 of base station 1) that device 1023 is determined by second.

The access situation of this moment is, the portable terminal I that is in the train inside in shown in Figure 1 move is directly inserted by base station 1, and mobile-relay station e is by base station 2 accesses.Preferably, again by the mobile-relay station handoff completion message of the 3rd control device 103 according to second control device 102 transmissions, control portable terminal I inserts from directly being inserted to switch to by mobile-relay station e by base station 1.Specifically by realizing with lower device:

Second receiving system 1030 in the 3rd control device 103 receives from the access point search request message that switches to the portable terminal I that is directly inserted by base station 1.

The 3rd dispensing device 1031 wherein sends access point search response message to portable terminal I, wherein comprises information such as access point search desired parameters.

After this, portable terminal I carries out the access point search.Preferably, portable terminal I can carry out described access point search before mobile-relay station e finishes above-mentioned switching.More preferably, base station 1 will be before this before portable terminal I carries out described search mobile-relay station e carry out the characteristic information notice portable terminal I of the result of access point search or the target BS that base station 1 is determined so that portable terminal I carries out described access point search targetedly.

Second judgment means 1032 judges whether to receive the access point handoff request message from this portable terminal I.Wherein, receive from the access point handoff request message of portable terminal I and the information that will receive this message by second receiving system 1030 and notify second judgment means 1032.If receive described access point handoff request message, then judgment means 1032 is notified the 3rd dispensing device 1031 with judged result; Otherwise, notify second receiving system 1030 with judged result.

When judged result when receiving described access point handoff request message, send pre-switch notification request message at least one adjacent base station by the 3rd dispensing device 1031 to base station 1;

The pre-switch push-notification-answer message that second receiving system 1030 receives from described adjacent base station;

The 3rd dispensing device 1031 sends access point switching response message (MOB BSHO_RSP) and gives portable terminal I; Received from the switching of portable terminal I by second receiving system 1030 and indicate (MOB HO_IND), expression portable terminal I determines will switch to by mobile-relay station e to insert.So far, mobile-relay station e and subordinate's portable terminal 1 thereof have been finished from the adjacent base station 2 that is linked into by base station 1 by base station 1 and have been inserted.In this process, guaranteed the proper communication of portable terminal I.

Fig. 5 shows in detail each message that switching control when work of the specific embodiment of the invention shown in Figure 4 use.Followingly another specific embodiment of the present invention (middle access point is that target BS is base station 2) is described with reference to Fig. 5 and in conjunction with Fig. 1, before address, middle access point involved in the present invention both can be source base station or its subordinate's relay station, also can be target BS or its subordinate's relay station.Therefore, can understand this specific embodiment with reference to description to previous embodiment.

Portable terminal I reason mobile-relay station e provides and inserts and be connected to indirectly base station 1, and portable terminal I periodically sends access point searching request (MOB SCN_REQ) to mobile-relay station e (or via described mobile-relay station e to base station 1); After obtaining access point search response message, portable terminal I carries out the access point search intensity of the downstream signal of each base station (relatively from) and determines whether to switch to a base station outside the source base station, whether send access point handoff request message (MOB MSHO_REQ supposes that its requirement switches to by base station 2 accesses) with decision to base station 1.

After base station 1 receives access point handoff request message, send the pre-switch notification request message at least one adjacent base station and receive pre-switch push-notification-answer message from described adjacent base station; Receive from the feedback of other base stations and in the middle of having determined one behind the access point, base station 1 sends the access point switching response message to portable terminal I; Portable terminal I sends to base station 1 and switches indication (MOBHO_IND); After this, portable terminal I realizes being inserted by base station 2 through operations such as range finding, registrations;

After this, mobile-relay station e sends the access point search request message to described base station 1; Because portable terminal I this moment has switched to by other access point and has inserted in advance, therefore, can the make an immediate response request of mobile-relay station e of base station 1, send access point search response message (preferably to it, the characteristic information that can be base station 2 with portable terminal I access point at this moment is notified to described mobile-relay station e, makes it carry out the access point search targetedly);

Then mobile-relay station e carries out access point search (searching in like manner with the access point of portable terminal I) in 1 to the time of a plurality of frames, and determines whether to send handoff request to described base station 1 according to comparative result;

Base station 1 judges whether to receive the access point handoff request message from mobile-relay station e,

If-do not receive described message, then by control and mutual with base station 2, with portable terminal I by from the base station 2 directly access switch back again by mobile-relay station e and insert;

If-receive described access point handoff request message from mobile-relay station e, then send the pre-switch notification request message at least one adjacent with it base station and receive the other side's feedback, then, determine the target access that mobile-relay station e switches, and send access point switching response message (MOB BSHO_RSP) to mobile-relay station e; Then, mobile-relay station e sends and switches indication (MOB HO_IND) to base station 1, confirms to switch.

Then, mobile-relay station e realizes being inserted by base station 2 by operations such as range finding, registrations.

At this moment, portable terminal I and mobile-relay station e directly are responsible for access by base station 2, we understand, access point under same base stations control switches simple relatively, only need base station 2 to send RNG_RSP or (PMC_RSP) and UCD/DCD, UL_MAP or DL_MAP give portable terminal I, and making it adapt to new access point is mobile-relay station e.

So far, mobile-relay station e and subordinate's portable terminal thereof have been finished by base station 1 and have been linked into access by base station 2.In conjunction with the description of aforesaid the applicant in first to file, only need to analyze according to the link condition of its grasp and judge, can help those of ordinary skills to realize that on the basis of understanding above-mentioned specific embodiment mobile-relay station and subordinate's portable terminal thereof are to the described switching that is inserted by a target BS subordinate relay station by target BS.

Below in conjunction with Fig. 6, the internal structure according to the mobile-relay station of another embodiment of the present invention is described.Mobile-relay station 60 according to embodiment of the present invention comprises source access point transceiver 601, transmits processing unit 602, switch processing device 603 and MS transceiver 604.

In the relay station 600 according to embodiment of the present invention, source access point transceiver 601 receives from the message of source access point or to the source access point and sends message, and wherein, the source access point for example is source base station or source relay station.When mobile-relay station does not switch, will arrive MS transceiver 603 from the forwards of source access point via transmitting processing unit 602, and send to MS via MS transceiver 603, vice versa.And when mobile-relay station switches, the processing that will be correlated with by switch processing device 604.In the present embodiment, switch processing device 604 comprises switching searcher 6041, switching judging device 6042, target access deflector equipment 6043.Preferably, switch processing device 604 also comprises MS network reentry agent apparatus 6044.

Describe relation between mobile-relay station 60 each parts when switching in detail below in conjunction with Fig. 6.After source access point transceiver 601 receives access point search trigger message from source base station 1, source access point transceiver 601 will send the access point search request message to the source access point according to the indication of switching searcher 6041.According to the access point search request message, the source access point is given portable terminal I through mobile relaying war transmission ranging response message (RNG_RSP) or power control mode switch response (PMC_RSP), adjust the transmitting power of portable terminal I so that it adapts to the transmission range of new transmission link, thereby finish the More Soft Handoff of portable terminal I.

After this, the source access point sends access point search response message (MOBSCN_RSP) to mobile-relay station e, wherein comprises the relevant parameter that carries out the access point search, as searches for used Radio Resource etc.After source access point transceiver 601 received access point search response message (MOBSCN_RSP), indication was switched searcher 6041 and is begun to carry out the access point search, for example, and the lead code of each adjacent base station of search base station 1.Switching judging device 6042 will be according to the intensity of each adjacent base station of interpretation of result that switches searcher 6041 search, determines whether and will switch in conjunction with the signal strength signal intensity between itself and the base station 1.This judgement for example can draw by the intensity of each adjacent base station and the signal strength signal intensity between mobile-relay station and the base station 1 are compared.

If judge that through switching judging device 6042 mobile-relay station e need not to switch, then this judged result is sent to base station 1 by source access point transceiver 601, base station 1 will control portable terminal I and be switched back by mobile-relay station e by middle access point access and insert.

If judge and to switch through switching judging device 6042, then can send access point handoff request message to base station 1 by source access point transceiver 601, wherein comprise the characteristic information of the mobile-relay station e possible target BS that comparison gets according to the access point Search Results, these possible target BS can provide preferable quality of service for mobile-relay station e.After receiving the pre-switch push-notification-answer message of adjacent base station, base station 1 sends this access point switching response message (MOB BSHO_RSP) and gives mobile-relay station e, informs that thus target access network deflector equipment 6043 can switch and the relevant information of target access.Finish all processes that MRS is registered to target access by target access network deflector equipment 6043, it is similar substantially that the initialization when inserting an access point of this process and relay station enters process.Promptly send distance measurement request (RNG_REQ) and register requirement (REG_REQ) and respond (REG_RSP) to ranging response (RNG_REQ) and the registration that target BS also receives from this target BS.So far, mobile-relay station e has finished by source access point (base station 1) and has been linked into the switching that target access (adjacent base station 2 of base station 1 as shown in Figure 1) inserts.

After the switching of the target access of MRS is finished, target access network deflector equipment 6043 will send to base station 1 by source access point transceiver 601 and switch indication (MOBHO_IND).After receiving this switching indication, base station 1 will be according to finishing the switching of portable terminal I to current MRS from the access point search request message of portable terminal I.In this process, MRS will utilize at source access point transceiver 601, forwarding processing unit 602 and MS transceiver 603 and transmit message between base station 1 and portable terminal I.

Preferably, in order to reduce complexity, for belonging to the switching of unshowned other portable terminal of Fig. 1 under the mobile-relay station e control together with portable terminal I, can in mobile-relay station, dispose a MS network reentry agent apparatus 6044, one side is switched relevant information in order to memory mobile terminal with the sub-district, as CID, MAC Address, service feature or the like, on the other hand can be before portable terminal enters switching state, utilize the above-mentioned information relevant to finish the part cell handover operations of portable terminal by target access network deflector equipment 6043 with the sub-district switching, upgrade as CID, the CID mapping relations are upgraded, re-authentication, key updating, capability negotiation (capacity negotiation) and to the network registry portable terminal etc., to reach the purpose of quickening handoff procedure.

Below the switching situation that in conjunction with the accompanying drawings source access point and target access is the base station is described, and precedingly addresses, and the switching of mobile-relay station and subordinate's portable terminal thereof also can relate to following situation:

A. in same base station range, switch:

B. in the coverage of different base station, switch, specifically be divided into following 4 kinds of situations

For the various switch forms under the b item, its common feature is before source base station or target BS subordinate's relay station switches as mobile-relay station e and/or the access point after switching.The base station that these situations and front are described in detail in conjunction with specific embodiments is to the difference of the switching of base station, in handoff procedure, the distance measurement request/response between mobile-relay station e and the target BS and register requirement/response are carried out relaying by the corresponding relay station of the subordinate of target BS.

As for determining of target access, abovely explain in conjunction with specific embodiments of the invention, can in source base station, only determine target BS, and by target BS switch between the base station finish after, need to judge whether the signal of relaying and mobile-relay station e and which relay station to carry out relaying by analyzing each link signal intensity again by.

For the various switch modes under a item, its common feature is that access point all belongs to same base station before and after switching, and also, source access point and target access are all inserted by a base station.If the standard code of this area from now on, mobile-relay station e during various or certain situation, need switch under a item takes place, and then the present invention can be applied to the control of this switching.Particularly, no matter when the control mobile-relay station still is the switching of portable terminal, all send RNG_RSP or PMC_RSP and UCD/DCD, UL MAP/DL MAP,, can realize described switching so that it adapts to new link (or access point) to it.

Preferably, when portable terminal (might terminal quiesce, and the vehicles at mobile-relay station place are near portable terminal by other access point during to the coverage relative motion of mobile-relay station; Also possible portable terminal is near static mobile-relay station, as, the passenger steps on car), if at a time monitoring portable terminal, the base station have two or more signal transmission paths to lead to this base station, and wherein a paths via described mobile-relay station relaying, this base station (source base station then, the also source base station that promptly switches) do not determine immediately with portable terminal switch to by this mobile-relay station insert (in fact, only similar passenger step on car etc. the two after this will keep for a long time enough near apart from the time practical significance of the described switching of generation just arranged).But with continuous measure channel quality of one-period/time interval (also signal strength signal intensity), when continuous 2 times or repeatedly measurement result are via the transmission path signal quality of mobile-relay station preferably, just allow portable terminal to switch to and insert by this mobile-relay station.

In like manner, preferably, when portable terminal is inserted by mobile-relay station, if portable terminal has one via described mobile-relay station relaying in the mulitpath of source base station, and via the signal strength signal intensity (channel quality) in the path of mobile-relay station when not satisfactory comparatively speaking, the base station does not determine user terminal is switched to by other access point access at once, but with continuous measure channel quality of one-period/time interval (also signal strength signal intensity), be via the transmission path signal quality of mobile-relay station when not good in continuous 2 times or repeatedly measurement result, just allow portable terminal to switch to and insert by other access point.

More than though embodiments of the present invention have been described in conjunction with the accompanying drawings, the present invention is not limited to concrete execution mode or preferred embodiment, those skilled in the art can make various distortion or modification within the scope of the appended claims.

Claims

1. changing method that in wireless network, is used to switch portable terminal, described portable terminal inserts by a mobile-relay station, may further comprise the steps:

A) described portable terminal switches to by a middle access point and inserts;

B) described mobile-relay station inserts from being inserted to switch to by a target access by a source access point; And

C) described portable terminal inserts from being inserted to switch to by described mobile-relay station by access point in the middle of described.

2. method according to claim 1 also comprises the steps:

According to the monitoring to communication link of described source access point and contiguous access point thereof, determining can be for the offer the best access point of quality of service of described portable terminal, as access point in the middle of described.

3. method according to claim 1 and 2, wherein, described in the middle of access point the current base station of described mobile-relay station sub-district of living in, these current other relay stations of base station subordinate, with contiguous other base stations of described current base station and relay station thereof in determine.

4. method according to claim 1 and 2, wherein, described step b) comprises:

Judge whether the source access point receives the access point handoff request message from this mobile-relay station.

5. method according to claim 4, wherein, when the source access point did not receive access point handoff request message from this mobile-relay station, then described mobile-relay station was not carried out switching, and described portable terminal switched back by this mobile-relay station inserted; And

When the source access point received access point handoff request message from this mobile-relay station, the access point that then will carry out described mobile-relay station switched.

6. method according to claim 1, wherein, described source access point and described target access are base station or relay station.

7. a switching control (10) is used to control the switching of portable terminal, and described portable terminal inserts by a mobile-relay station, comprising:

First control device (101) is used for control described portable terminal is switched to by a middle access point access;

Second control device (102) is used to control described mobile-relay station and inserts from being inserted to switch to by a target access by a source access point, and

The 3rd control device (103) is used to control described portable terminal and is switched to by described mobile-relay station access by access point access in the middle of described.

8. switching control according to claim 7, wherein, described first control device (101) comprising:

First determines device (1010), is used for according to the monitoring to communication link of described source access point and contiguous access point thereof, and determining can be for the offer the best access point of quality of service of described portable terminal, as access point in the middle of described; And

First dispensing device (1011) is used to send the signal that execution is switched to described middle access point.

9. according to claim 7 or 8 described switching controls, wherein, in the middle of described access point the current base station of described mobile-relay station sub-district of living in, these current other relay stations of base station subordinate, with contiguous other base stations of described current base station and relay station thereof in determine.

10. according to claim 7 or 8 described switching controls, described second control device (102) comprises first judgment means, is used to judge whether described source access point receives the access point handoff request message from this mobile-relay station.

11. switching control according to claim 10, also comprise the 4th control device (104), be used for not receiving access point handoff request message from this mobile-relay station when described source access point, described first judgment means is judged when not carrying out the switching of described mobile-relay station, receive this judged result, and described portable terminal is switched back by this mobile-relay station access; And

Described the 3rd control device of described switching control also is used for receiving this judged result when described first judgment means judges that described source access point receives access point handoff request message from this mobile-relay station.

12. switching control according to claim 7, wherein, described source access point and described target access are base station or relay station.

13. a base station comprises the switching control (10) of a portable terminal, described portable terminal inserts by a mobile-relay station, and described switching control (10) comprising:

14. according to the base station of claim 13, wherein, described first control device comprises:

First dispensing device (1011) is used for sending the signal of carrying out to described middle access point switching to described portable terminal.

15. according to the base station of claim 13, wherein, described second control device (102) comprising:

First receiving device (1020) is used to receive the access point search request message from described mobile-relay station;

Second dispensing device (1021) is used to send access point search response message to described mobile-relay station;

First judgment means (1022) judges whether described base station receives the access point handoff request message from described mobile-relay station; And

Second determines device (1023), judge that this base station receives described access point handoff request message if be used for described first judgment means, then according to by with the mutual resulting channel related information of adjacent base station, determine a target access, described target access can provide quality of service preferably for described mobile-relay station.

16. according to the base station of claim 13, wherein, described the 3rd control device comprises:

Second receiving system is used to receive the access point search request message from described portable terminal; And

The 3rd dispensing device is used to send access point search response message to described portable terminal.

17. base station according to claim 15, also comprise the 4th control device, be used for when judging that through described first judgment means described base station does not receive access point handoff request message from described mobile-relay station, control described mobile-relay station and still keep inserting, and described portable terminal is switched back by this mobile-relay station access from described source access point.

18. according to the base station of claim 16, wherein,

Described the 3rd control device also comprises:

Second judgment means is used to judge whether this base station receives the access point handoff request message from described portable terminal;

Described second receiving system also is used for, and receives the access point handoff request message from this portable terminal, and notify described second judgment means after receiving described access point handoff request message;

Described the 3rd dispensing device also is used for, and mutual by with adjacent base station sends the access point switching response message to described mobile-relay station.

19. according to the base station of claim 13, wherein, described in the middle of access point the current base station of described mobile-relay station sub-district of living in, these current other relay stations of base station subordinate, with contiguous other base station of described current base station and relay station thereof in determine.

20. according to the base station of claim 14, wherein, described first determines that device also is used to receive the access point handoff request message from described portable terminal; And described first dispensing device, also be used for mutual by with adjacent base station, send the access point switching response message to described portable terminal.

21. according to the base station of claim 15, wherein, described first receiving device also is used to receive the access point handoff request message from described mobile-relay station, and after receiving described access point handoff request message, notifies described first judgment means; Described second dispensing device also is used for, and sends the access point switching response message to described mobile-relay station.

22. according to the base station of claim 13, wherein, described source access point and described target access are base station or relay station.

23. support the mobile-relay station (60) that switches for one kind, its subordinate's portable terminal inserts the source access point by this mobile-relay station, described mobile-relay station comprises:

Source access point transceiver (601) is used to receive from the message of described source access point or to described source access point transmission message;

Portable terminal transceiver (604) is used to receive from the message of described portable terminal or to described mobile terminal to send message;

Transmit processing unit (602), be used between described source access point transceiver and described portable terminal transceiver, transmitting message; And

Switch processing device (604) is used for according to the search to described source adjacency of access points access point, described mobile-relay station inserted from being inserted to switch to by a target access by a source access point,

Wherein, described mobile-relay station from insert by a source access point switch to insert by a target access before, described portable terminal switches to by access point in the middle of and inserts,

After switching to by a target access access by a source access point access, described portable terminal inserts from being inserted to switch to by described mobile-relay station by access point in the middle of described at described mobile-relay station.

24. mobile-relay station according to claim 23 (60), wherein said switch processing device (604) comprising:

Switch searcher (6041), be used for described source adjacency of access points access point is carried out the access point search;

Switching judging device (6042) is used for the result according to described search, determines whether and need switch by the signal strength signal intensity that compares between each neighboring access point and the source access point; And

Target access network deflector equipment (6043), described switching judging device (6042) judgement is used for when need be switched, according to the target access that described source access point sends, the portable terminal of finishing described mobile-relay station subordinate is registered to target access.

25. when mobile-relay station according to claim 24 (60), wherein said switching judging device (6042) do not need to switch when judgement, notify this judged result to described source access point by described source access point transceiver.

26. mobile-relay station according to claim 25 (60), wherein said switch processing device (604) also comprises mobile terminal network reentry agent apparatus (6044), what be used to store described portable terminal switches relevant information with the sub-district, and before described portable terminal enters switching state or simultaneously, transmit described and the relevant information of sub-district switching to described target access network deflector equipment (6043), so that finish the part cell handover operations of described portable terminal.

27. mobile-relay station according to claim 26 (60), the wherein said information relevant with the sub-district switching comprises at least one in connection identifier (CID, Media Access Control Address, the service feature.