CN101175304B

CN101175304B - Switching method based on relay system

Info

Publication number: CN101175304B
Application number: CN2006101380094A
Authority: CN
Inventors: 鲁艳玲; 李婷; 冯淑兰; 韩静; 吕旌阳
Original assignee: Huawei Technologies Co Ltd; Beijing University of Posts and Telecommunications
Current assignee: Huawei Technologies Co Ltd; Beijing University of Posts and Telecommunications
Priority date: 2006-11-02
Filing date: 2006-11-02
Publication date: 2010-08-11
Anticipated expiration: 2026-11-02
Also published as: CN101175304A

Abstract

The present invention provides a switching method based on a relay system, which includes three steps. Firstly, a first switching node selects a switching target from the obtained candidate switching targets; secondly, the first switching node is synchronized with the downlink of the switching target; thirdly, the network reentry process is fulfilled. In the present invention, the first switchingnode can be a mobile terminal, and the switching target can be a relay station; or the first switching node can be a relay station, and the switching target can be a relay station or a base station; the technical scheme provided by the present invention realizes the switching method related to relay stations. In the present invention, the first switching node can be a mobile terminal, the switching target can be a base station, and the technical scheme provided by the present invention realizes the method by which a mobile terminal can switch base stations in the relay system.

Description

Changing method based on relay system

Technical field

The present invention relates to wireless communication technology, relate in particular in the wireless communication technology handoff technique based on relay system.

Background technology

In wireless communication field, wireless access technology is one of focus of research at present, especially wireless access wide band technology owing to can provide very high access rate to the user, and obtains more concern.The IEEE802.16e system is a kind of of BWA, its working group has released the physical layer and MAC (the Media Access Control of BWA, medium access control) Ceng final version standard, this standard comprises the requirement that works in 10～66GHz scope internal fixation, mobile wireless network High Data Rate intracardiac signal, also comprises fixing, the portable and mobile system semaphore request that works under the following non line of sight of 11GHz simultaneously.

No matter be wireless access system or BWA, all comprise MS (MobileStation, portable terminal) and BS (Base station, base station).Fig. 1 is the simple and easy networking schematic diagram of wireless access system.As shown in Figure 1, a plurality of base stations are inserted core net jointly, and each base station can provide service for a portable terminal at least.The sub-district that is covered by base station owing to portable terminal moves to sub-district that the another one base station covers or provides reasons such as the serving base station duty ratio is bigger for portable terminal, portable terminal need change to its serving base station, we are called switching with this process, wherein, portable terminal is called switching node.Be called former serving BS for portable terminal switches prerequisite for serving base station, base station after changing is called target BS, also can be called switching target.Handoff procedure can be initiated by portable terminal and base station respectively.

Fig. 2 is the flow chart of the handoff procedure of portable terminal initiation.As shown in Figure 2, comprise the steps:

Step S201: carry out the cell reselection process, that is, portable terminal obtains the relevant information of neighbours' station list and neighbours base station.

Step S202: initiation of switching and judging process, the implementation of this process can for:

Portable terminal sends MOB_MSHO-REQ message to former serving BS, asks one or more candidate target BS;

Former serving BS is replied MOB_BSHO-RSP message and is given portable terminal, the relevant information that can carry one or more candidate target BS in the message, for example information such as running status of portable terminal under these candidate target BS;

Portable terminal sends MOB_HO-IND message to former serving BS, can carry the decision of the target BS of selection in the message.

Step S203: the down link of portable terminal and target BS carries out synchronously;

Step S204: carry out network and reenter process, the implementation of this process can for:

Carry out the range finding of CDMA sign indicating number, target BS is that portable terminal distributes a competition or non-competing range measurement resource;

Portable terminal sends RNG-REQ message to target BS, carries the sign of the sign of portable terminal, former serving BS and the sign of range finding type in the message;

Target BS returns RNG-RSP message and gives portable terminal, and described RNG-RSP message can be carried parameters such as professional skill prediction, handoff procedure optimization;

Reenter the subsequent processing steps of process.

Step S205: former serving BS stop with portable terminal between all be connected and related context.

Fig. 3 is the flow chart of the handoff procedure of former serving BS initiation.The switching flow that switching flow that former serving BS is initiated and portable terminal are initiated is basic identical, difference is, in the initiation and judging process of switching, former serving BS at first sends MOB_BSHO-REQ message to portable terminal, can carry the information of former serving BS in the message to one or more candidate target BS of portable terminal recommendation, after portable terminal receives MOB_BSHO-REQ message, return MOB_HO-IND message and give former serving BS, the decision of carrying the target BS of selection in the message.

Because the radio wave that frequency is high is very fast with the ratio of range attenuation, so the coverage that is operated in the base station under the high-frequency is very limited.For solving the coverage problems of base station, can in wireless access system, add radio repeater station.Relay station can communicate by air interface and base station, and the data of transmitting mobile terminal.The complexity of building relay station is more much smaller than building the base station, and under identical systematic function required, as the coverage of system and throughput etc., the time and the expense of building relay station were to lack than the time and the expense of building the base station.Therefore, use relay station can improve the performance of wireless access system with lower cost.Use the wireless access system of relay station to be called relay system.Fig. 4 is the simple and easy networking schematic diagram of relay system.As shown in Figure 4, a plurality of base stations are inserted core net jointly, and each base station can provide service for a portable terminal or relay station at least, and each relay station can provide service for a portable terminal or relay station at least.For portable terminal and/or relay station provide the relay station of service or base station to be called service node.

In the wireless access system that does not use relay station, the base station is the unique switching target of portable terminal, and in relay system, the switching target of portable terminal is not only in the base station, relay station also may be the switching target of portable terminal, for example, portable terminal moves to the service range of another relay station in the sub-district or outside the sub-district from the service range of former service relay stations, and at this moment portable terminal also will be initiated handoff procedure.In addition, relay station also can move, when relay station when the coverage of former serving BS moves to the coverage of another base station, relay station will be initiated handoff procedure.So in relay system, switching node can be portable terminal or relay station, switching target can be relay station or base station.

At present, for the handoff procedure in the relay system, go back the concrete technical scheme of neither one.

Summary of the invention

The technical problem that the embodiment of the invention will solve is to provide a kind of changing method based on relay system, to realize the changing method in the relay system.

For solving the problems of the technologies described above, the embodiment of the invention provides a kind of changing method based on relay system, comprise: first switching node is selected a switching target from the candidate switching target that obtains, specifically comprise: the information that obtains at least one candidate switching target, the candidate switching target is assessed, and notified the switching target of selecting to former service node; The down link of first switching node and switching target carries out synchronously; Finish network and reenter process, specifically comprise: carry out CDMA sign indicating number ranging process, make the up link of first switching node and switching target reach synchronous; Switching target is that first switching node distributes range measurement resource; First switching node sends distance measurement request message to switching target; Switching target returns ranging response message to first switching node; If switching target obtains the time that first switching node will be found range in advance, then needn't carry out the range finding of CDMA sign indicating number, switching target directly is that first switching node distributes non-competing range measurement resource; Wherein, first switching node is a portable terminal, and switching target is relay station or base station; Perhaps, first switching node is a relay station, and switching target is relay station or base station.

Compared with prior art, the embodiment of the invention has the following advantages:

In embodiments of the present invention, first switching node can be portable terminal, and switching target can be relay station, perhaps, first switching node can be relay station, and switching target can be relay station or base station, and the technical scheme that the embodiment of the invention provides has realized relating to the changing method of relay station;

In embodiments of the present invention, first switching node can be portable terminal, and switching target can be the base station, and the technical scheme that the embodiment of the invention provides has realized the method for portable terminal base station shifting in relay system.

Description of drawings

Fig. 1 is the simple and easy networking schematic diagram of existing wireless access system;

Fig. 2 is the flow chart of the handoff procedure of existing portable terminal initiation;

Fig. 3 is the flow chart of the handoff procedure of existing former serving BS initiation;

Fig. 4 is the simple and easy networking schematic diagram of relay system of the present invention;

Fig. 5 is the flow chart of first embodiment of the portable terminal of the present invention changing method of initiating;

Fig. 6 is the flow chart of second embodiment of the portable terminal of the present invention changing method of initiating;

Fig. 7 is the flow chart of the embodiment of the former service relay stations of the present invention changing method of initiating;

Fig. 8 is the flow chart of the embodiment of the former serving BS of the present invention changing method of initiating;

Fig. 9 is the flow chart of first embodiment of the relay station of the present invention changing method of initiating;

Figure 10 is the flow chart of second embodiment of the relay station of the present invention changing method of initiating.

Embodiment

Below we will be in conjunction with the accompanying drawings, optimum implementation of the present invention is described in detail.At first it is to be noted, the implication of the term of using among the present invention, words and claim can not only only limit to its literal and common implication and go to understand, the implication and the notion that also comprise and then conform to technology of the present invention, this is because we are as the inventor, to suitably provide the definition of term, so that the most appropriate description is carried out in our invention.Therefore, the configuration that provides in this explanation and the accompanying drawing is first-selected embodiment of the present invention, rather than will enumerates all technical characteristics of the present invention.We will recognize to also have the various equivalent scheme or the modifications that can replace our scheme.

At first provide the overall technical architecture of method to describe to the embodiment of the invention.The changing method based on relay system of the embodiment of the invention comprises: first switching node is selected a switching target from the candidate switching target that obtains; The down link of first switching node and switching target carries out synchronously; Finish network and reenter process.

First switching node can be portable terminal, switching target can be relay station or base station, for providing the former service node of service, portable terminal can be relay station or base station, promptly, in the variable more same sub-district of former service relay stations or the sub-district outside new relay station or base station, in the also variable more same sub-district of former serving BS or the sub-district outside new relay station or base station.Switching can be initiated by portable terminal, also can be initiated by former service relay stations or former serving BS.

Now in conjunction with specific embodiments, the changing method under the above-mentioned multiple situation is elaborated.

Fig. 5 is the flow chart of first embodiment of the changing method of portable terminal initiation.In this embodiment, for portable terminal provides the low ability relay station that is of service, be another relay station in base station, the same sub-district or another relay station of different districts for low ability relay station provides the base station that is of service, the switching target of portable terminal.Wherein, low ability relay station can only carry out transparent transmission to message, does not change the message content of MAC, does not have the ability that generates, revises or stop for the signaling that relates in the handoff procedure.The reason that portable terminal initiates to switch can move in the service range of another one relay station for the service range of portable terminal by the low ability relay station of former service, perhaps move to the coverage of another one base station, portable terminal is in order to obtain better service quality, and the relay station or the base station of its service is replaced by in request.

As shown in Figure 5, this embodiment comprises following several steps:

Step S501: carry out switching target reselection procedure process, the main purpose of this process is to make portable terminal obtain the tabulation and the information thereof of neighbours' relay station or neighbours base station, can be realized by following manner:

Portable terminal obtains the tabulation of neighbours' relay station or neighbours base station from neighbours' broadcast MOB_NBR-ADV, MOB_NBR-ADV message is the broadcast that low ability relay station of former service or former serving BS send, all portable terminals or relay station in the service range of former service relay stations or former serving BS can receive, wherein, portable terminal can obtain operator's identifier from MOB_NBR-ADV message, the config update counter, divide block identification, total piecemeal number, the number of neighbor site, the relevant information of each neighbor site, relevant information can comprise the physical characteristic identifier of each website, frequency allocation situation, the EIRP of website (equivalent isotropically radiated power, equivalent isotropically radiated power), BSID (Base Station Identification), the leading numbering of signal, the handoff procedure parameters optimization, supported dispatching services type, DCD (Downlink Channel Descriptor, downlink channel descriptor) config update counting, UCD (Uplink Channel Descriptor, uplink channel descriptor) config update counting and security information, certainly, these information are optional a bit, in addition, portable terminal is the acquisition MOB_NBR-ADV message of property at interval, and the neighbours' relay station in the MOB_NBR-ADV message or the tabulation of neighbours base station might be upgraded;

Portable terminal optionally scans or measures neighbours' relay station or neighbours base station, for example, the target that portable terminal can be selected scanning or measure from a plurality of tabulations that obtain, in scanning or the measuring process, portable terminal carries out synchronously scanning or neighbours' relay station of measuring or the down link of neighbours base station, and downstream signal is measured;

If portable terminal is thought the insufficient or other reasons of information that obtains, can also be on the basis of scanning, portable terminal continues the neighbours' relay station that is scanned or the up link of neighbours base station are found range, and to obtain ranging parameters, this process is called associating.

Portable terminal can obtain the available professional skill prediction in neighbours base station measured result, neighbours base station, ranging parameters from scanning or combined process.Wherein, in scanning process, portable terminal is only measured potential target base station, can only obtain neighbours' base station measurement result, combined process then is on the basis of scanning, and potential target base station is united range finding, to obtain the available professional skill prediction in ranging parameters and base station.Measured result can comprise average CINR (Carrier interference ratio), RSSI (Received Signal Stengh Indicator, received signal intensity indication), path delay back and forth at relative delay, grappling station, ranging parameters can comprise that the time adjusts parameter, power level adjustment, frequency adjustment, distance measuring states.

By above-mentioned steps, portable terminal has obtained the information of neighbours' relay station or neighbours base station.

Step S502: initiation of switching and judging process, the main purpose of this process are to make portable terminal select one as target relay station or target BS from candidate target relay station or candidate target BS, can be realized by following manner:

Portable terminal sends handoff request message MOB_MSHO-REQ to former service relay stations, because former service relay stations is low ability relay station, so former service relay stations is given former serving BS with the MOB_MSHO-REQ forwards, MOB_MSHO-REQ message is represented mobile terminal request candidate target relay station or base station;

Former serving BS returns switching response message MOB_BSHO-RSP to former service relay stations, and former service relay stations is given portable terminal with the MOB_BSHO-RSP forwards, carries the information of at least one candidate target relay station or base station in the MOB_BSHO-RSP message;

Portable terminal is assessed candidate target relay station or base station, and to former service relay stations transmission switch indicating information MOB_HO-IND, former service relay stations is given former serving BS with the MOB_HO-IND forwards, MOB_HO-IND message is represented the target relay station of portable terminal selection or the decision of base station, that is, target relay station or the base station of selecting which relay station or base station conduct to switch is described.

If the switching target of portable terminal is a target relay station, information such as the switching target notice that then former serving BS will be selected portable terminal provides serving base station for target relay station, for providing serving base station, target relay station sends switch indicating information to target relay station again, with switching identifier (if being assigned with in MOB_BSHO-RSP) and start-up time that the notification target relay station is assigned with, the form of switch indicating information is as shown in table 1:

Grammer	Size (unit: bit)	Explanation
Grammer	Size (unit: bit)	Explanation	HO-IND message format ()	-	-
Management Message Type	8	Type of message	HO-IND message format ()	-	-
Management Message Type	8	Type of message	Mode	2	0b00: be used for switching indication 0b01～0b11: reserve
Reserved	6	Should be made as 0.	Mode	2	0b00: be used for switching indication 0b01～0b11: reserve
Reserved	6	Should be made as 0.	If (Mode==0b00)		If this message is to be used for switching
HO_ID-included_indicator	1	0b00:	If (Mode==0b00)		If this message is to be used for switching
HO_ID-included_indicator	1	0b00:	If (HO_ID-included_indicator==1)
HO_ID	8		If (HO_ID-included_indicator==1)

}
}			Action Time	2
Padding	5	Be 0	Action Time	2
Padding	5	Be 0	TLV cncoded information	2	The TLV coded message comprises authentication security information
}			TLV cncoded information	2

Table 1 switch indicating information form

After said process is finished, former service relay stations stop with portable terminal between communicate by letter.

Need to prove that the MOB_HO-IND message that portable terminal sends can have various states,, represent that then portable terminal will carry out switching if for discharging former service relay stations state, stop with former service relay stations between communicate by letter; If be disarmed state, then former serving BS resends MOB_BSHO-RSP message, to recommend candidate target relay station or base station again; If be the cancellation state, then portable terminal and former serving BS all will be cancelled handover operation, return to normal operating conditions.

Need to prove that also candidate target relay station that former service relay stations or former serving BS provide or base station can be identical in neighbours' relay station or neighbours base station that step S501 obtains with portable terminal, also can part identical, can also be inequality fully.

Step S503: the down link of portable terminal and target relay station or base station carries out synchronously, the main purpose of this process is to make portable terminal can successfully obtain the up link of target relay station or base station and the transmission parameter of down link, if from MOB_NBR-ADV message, obtain the sign of target relay station or base station before the portable terminal, operating frequency, DCD (Downlink Channel Descriptor, downlink channel descriptor), UCD (Uplink Channel Descriptor, uplink channel descriptor) parameter then can be accelerated synchronous process.

Step S504: finish network and reenter process, the main purpose of this process is to make portable terminal and target relay station or base station obtain the other side's relevant information respectively, prepares for follow-up normal information, and this process comprises:

Carry out CDMA sign indicating number ranging process, a purpose of this process is to make the up link of portable terminal and target relay station or base station reach synchronous;

Target relay station or base station are that portable terminal distributes range measurement resource;

Portable terminal sends distance measurement request message RNG-REQ to target relay station or base station, carries the sign of the sign of portable terminal, former serving BS or relay station and the sign of range finding type among the RNG-REQ, and the sign of range finding type represents to switch range finding;

Ranging response message RNG-RSP is returned to portable terminal in target relay station or base station, RNG-RSP message can carry target relay station or the base station is basic CID (ConnectionIdentifier connects identifier), main management CID, target relay station or the relevant informations such as service in base station providing capability, handoff procedure optimization that portable terminal distributes;

Carry out network and reenter the subsequent step of process, if switching target is a target BS, then the network subsequent step that reenters process comprises successively: re-authentication process, basic capability negotiation process, heavy enrollment process, Business Stream are rebuild upright process.

Wherein, in the re-authentication process, portable terminal sends authentication request message to target BS, and authentication request message is carried sign, the digital certificate of portable terminal;

If target BS assert that portable terminal is legal, then to portable terminal return authentication response message, target BS distributes authenticate key to portable terminal in authentication response message;

After portable terminal is received authentication response message, just can further send secret key request message, to the target base station requests business cipher key;

Target BS is to portable terminal " return " key" response message, and target BS is given portable terminal distribution service key in key response message.

In basic capability negotiation process, the portable terminal handling capacity is consulted system parameters and the function that request can be supported to target base station requests oneself, and the target BS handling capacity consults to reply the function notice portable terminal that target BS is agreed.

In heavy enrollment process, the IP version that portable terminal oneself is supported to the target BS registration by register request message, management mode etc., IP version and management mode that target BS is supported to the portable terminal reporting system in enrollment response message.

Rebuild in the upright process at Business Stream, portable terminal is set up the type and QoS (the Quality of Service thereof of requested service stream and Business Stream by traffic request message, service quality) parameter, target BS is set up at Business Stream and is agreed in the response message or refuse to set up Business Stream, and portable terminal is set up in the acknowledge message at Business Stream response message is confirmed.

In above-mentioned each process,, then reenter in the process and just can omit corresponding step at network if informed in the handoff procedure parameters optimization in RNG-RSP message that portable terminal can dispense some step.

If switching target is a target relay station, then the network subsequent step that reenters process also can comprise successively: re-authentication process, basic capability negotiation process, heavy enrollment process, Business Stream are rebuild upright process.No matter target relay station is high ability relay station or low ability relay station, it can the transparent transmission portable terminal and interactive messages between the serving BS of service is provided for target relay station, so, finish the subsequent step that network reenters process for target relay station provides the serving BS of service can act on behalf of target relay station.

Need to prove that if target relay station or base station obtain the time that portable terminal will be found range in advance, then needn't carry out the range finding of CDMA sign indicating number, non-competing range measurement resource can directly be distributed for portable terminal in target relay station or base station.

Step S505: former service relay stations stop with portable terminal between communicate by letter and context, context for example is information, ARQ (Automatic Repeat Request in the formation, the access request) state machine, counter, timer or head compression relevant information etc., if former service relay stations does not possess the communication of termination and contextual ability, then can finish this process by former serving BS, former service relay stations only needs transparent transmission signaling or message to get final product.

In the embodiment shown in fig. 5, what provide service for portable terminal is former service relay stations, if what provide service for portable terminal is former serving BS, then the step of Qie Huaning and each step shown in Figure 5 are basic identical, as long as change communicating by letter of carrying out between portable terminal and the former service relay stations into carry out between portable terminal and the former serving BS communicate by letter.

In the embodiment shown in fig. 5, if switching target be and the target relay station of former service relay stations in same cells, then needn't carry out context and stop, can omit step S505; If switching target is and the target relay station of former service relay stations in different districts, then in step S501, the tabulation that former service relay stations provides can be the tabulation of neighbours base station and/or the tabulation of the relay station in these neighbours' base station ranges, former service relay stations can obtain these list informations to former serving BS request, if former serving BS does not have these list informations or list information substantial, out-of-date, then can obtain these list informations to core net.

Fig. 6 is the flow chart of second embodiment of the changing method of portable terminal initiation.In this embodiment, for portable terminal provide service for high ability relay station, be another relay station in base station, the same sub-district or another relay station of different districts for high ability relay station provides the base station that is of service, the switching target of portable terminal.Wherein, high ability relay station can change the message content of MAC, has the ability of generation, modification or termination for the signaling that relates in the handoff procedure.The reason that portable terminal initiates to switch can move in the service range of another one relay station for the service range of portable terminal by former service relay stations, perhaps move to the coverage of another one base station, portable terminal is in order to obtain better service quality, and the relay station or the base station of its service is replaced by in request.

As shown in Figure 6, this embodiment comprises following several steps:

Step S601: carry out switching target reselection procedure process, the main purpose of this process is to make portable terminal obtain the tabulation and the information thereof of neighbours' relay station or neighbours base station, can be realized by following manner:

Portable terminal obtains the tabulation of neighbours' relay station or neighbours base station from neighbours' broadcast MOB_NBR-ADV, MOB_NBR-ADV message is the broadcast that former service relay stations or former serving BS send, all portable terminals or relay station in the service range of former service relay stations or former serving BS can receive, wherein, portable terminal can obtain operator's identifier from MOB_NBR-ADV message, the config update counter, divide block identification, total piecemeal number, the number of neighbor site, the relevant information of each neighbor site, relevant information can comprise the physical characteristic identifier of each website, frequency allocation situation, the EIRP of website, BSID, the leading numbering of signal, the handoff procedure parameters optimization, supported dispatching services type, DCD config update counting, UCD config update counting and security information, certainly, these information are optional a bit, in addition, portable terminal is the acquisition MOB_NBR-ADV message of property at interval, and the neighbours' relay station in the MOB_NBR-ADV message or the tabulation of neighbours base station might be upgraded;

Step S602: initiation of switching and judging process, the main purpose of this process are to make portable terminal select a target relay station or target BS from candidate target relay station or candidate target BS, can be realized by following manner:

Portable terminal sends handoff request message MOB_MSHO-REQ to former service relay stations, and MOB_MSHO-REQ message is represented mobile terminal request candidate target relay station or base station;

The switching target list that has portable terminal to require in the MOB_MSHO-REQ message that portable terminal sends, former service relay stations can be made amendment to this list, oneself recommend the enough new relevant information of switching target if former service relay stations has had, then can directly reply MOB_BSHO-RSP; If can not directly reply, then need to send the handoff parameter request message, with the relevant information of acquisition request to former serving BS.Former service relay stations at first identifies the website with neighbours' station identifier of 8 bits sign among the MOB_MSHO-REQ with the complete station identifiers of its 48 bit, send the handoff parameter request message afterwards, need carry out the parameter at the neighbours station of parameter request to former serving BS request, these parameters can comprise connection resource maintenance, signal preamble index, professional skill prediction, network assistance switch support, the certification policy in the handoff procedure, time of implementation etc., certainly, also can the requested part parameter, wherein, neighbours' station identifier distributes in MOB_NBR-ADV message.After former serving BS receives the handoff parameter request message, inquire the cell base station of recommending the switching target place, then respectively to these parameters of these base station requests, these base stations are owing to all understand ability, the resource allocation conditions of all relay stations of service, so can reply these parameters by core net.Former serving BS just can generate the handoff parameter response message after receiving all answer message of these base stations, sends to former service relay stations.After former service relay stations is received the handoff parameter response message, in conjunction with the existing neighbours information of standing, simultaneously, if in these neighbours stations the base station of having distributed 8 bit neighbours station identifications in MOB_NBR-ADV message is arranged, just replace 48 bit identification, generate MOB_BSHO-RSP message with 8 bit identification.

If former service relay stations has obtained the up-to-date professional providing capability of at least one candidate target relay station or base station, handoff procedure is optimized, switch relevant informations such as back authentication method indication, then can directly return switching response message MOB_BSHO-RSP to portable terminal, otherwise, former service relay stations sends the handoff parameter request message to former serving BS, to ask the up-to-date professional providing capability of at least one candidate target relay station or base station, handoff procedure is optimized, switch relevant informations such as back authentication method indication, former serving BS returns the handoff parameter response message to former service relay stations, carry the up-to-date professional providing capability of at least one candidate target relay station or base station in the handoff parameter response message, handoff procedure is optimized, switch relevant informations such as back authentication method indication, former service relay stations is returned switching response message MOB_BSHO-RSP to portable terminal again, and handoff parameter request message format and handoff parameter response message format are respectively shown in table 2 and table 3;

Grammer

Size (unit: bit)

Explanation

MOB_HOPARA-REQ message format ()	-	-
MOB_HOPARA-REQ message format ()	-	-	Management Message Type	8	Type of message
Mode	3	0b000: the parameter request 0b001 that is used to switch～0b111: reserve	Management Message Type	8	Type of message
Mode	3		Reserved	5	Should be made as 0
If (Mode==0b000)		If this message is to be used for switching	Reserved	5	Should be made as 0
If (Mode==0b000)		If this message is to be used for switching	N_Para_Req	8	The neighbours station that needs required parameter
For (j=0; J＜N_Para_Req; J++)			N_Para_Req	8	The neighbours station that needs required parameter
For (j=0; J＜N_Para_Req; J++)			Neighbor S I D	48	The identifier at neighbours station
Para_Indicator	8	If bit is made as 1, the 0th bit of then this parameter is asked in expression.: the 1st bit of signal preamble index (Preamble index): professional skill prediction (Service Level Prediction) the 2nd bit: the 3rd bit of handoff procedure optimization (HO Process Optimization): network assistance is switched and supported (Network Assissted HO support) the 4th bit: the 5th bit of the certification policy in the handoff procedure (HO_authorization_policy_support): resource keeps (Resoure Retain) the 6th bit: start-up time (Action Time) the 7th bit: reserve	Neighbor S I D	48	The identifier at neighbours station
Para_Indicator	8		}
Padding	Variable	Filling bit guarantees that this message-length is the integral multiple of 8 bits	}
Padding	Variable		TLV encoded information	2	The TLV coded message comprises authentication security information
}			TLV encoded information	2

Table 2 handoff parameter request message format

Grammer	Size (unit: bit)	Explanation
Grammer	Size (unit: bit)	Explanation	MOB_HOPARA-RSP message format ()	-	-
Management Message Type	8	Type of message	MOB_HOPARA-RSP message format ()	-	-

Mode	3	0b000: the parameter that is used to switch is replied 0b001～0b111: reserve
Mode	3		Reserved	5	Should be made as 0
If (Mode==0b000)		If this message is to be used for switching	Reserved	5	Should be made as 0
If (Mode==0b000)		If this message is to be used for switching	N_Para_Req	8	The neighbours station that needs required parameter
Resource Retain Flag	1	0: discharge link information 1: keep link information	N_Para_Req	8	The neighbours station that needs required parameter
Resource Retain Flag	1	0: discharge link information 1: keep link information	Reserved	7	Reserved bit will be made as 0
For (j=0; J＜N_Para_Req; J++)			Reserved	7	Reserved bit will be made as 0
For (j=0; J＜N_Para_Req; J++)			Neighbor S I D	48	The identifier at neighbours station
Para_Indicator	8	If bit is made as 1, then this parameter is asked in expression.The 0th bit: the 1st bit of signal preamble index: professional skill is predicted the 2nd bit: handoff procedure is optimized the 3rd bit: the 4th bit of support switched in network assistance: 5.6.7 bit of the certification policy in the handoff procedure: reserve	Neighbor S I D	48	The identifier at neighbours station
Para_Indicator	8		If Para_Indicator[bit#0]==1)
Preamble index/Preamble Present	8	The signal at neighbours station is leading	If Para_Indicator[bit#0]==1)
Preamble index/Preamble Present	8	The signal at neighbours station is leading	}
Lf Para_Indicator[bit#1]==1)			}
Lf Para_Indicator[bit#1]==1)			Service Level Prediction	8	0: provide any professional 1 can not for this MS: can provide one or more authentic professional 2 to MS: to the Business Stream of each authentication, MAC connects the requirement that can satisfy the authentication qos parameter set.3: cannot obtain the professional skill prediction
}			Service Level Prediction	8
}			If Para_Indicator[bit#2]==1)
HO Process Optimization	16	Wherein each bit is set, omissible step in the expression handoff procedure.Establishing method is identical with establishing method among the 802.16e.	If Para_Indicator[bit#2]==1)
HO Process Optimization	16		}
If Para_Indicator[bit#3]==1)			}
If Para_Indicator[bit#3]==1)			Network Assissted HO support	1	0: network enabled is not auxiliary switches

		1: network enabled is auxiliary to be switched
		1: network enabled is auxiliary to be switched	}
If Para_Indicator[bit#4]＝＝1){			}
If Para_Indicator[bit#4]＝＝1){			HO_authorization_policy_support	8
}			HO_authorization_policy_support	8
}			Padding	7	Filling bit
}			Padding	7	Filling bit
}			Action time	8	Start-up time
padding	Variable	Filling bit guarantees that this message-length is the integral multiple of 8 bits	Action time	8	Start-up time
padding	Variable		TLV encoded information	2	The TLV coded message comprises authentication security information
}			TLV encoded information	2

Table 3 handoff parameter response message format

If the switching target of portable terminal is a target relay station, information such as the switching target notice that then former serving BS will be selected portable terminal provides serving base station for target relay station, for providing serving base station, target relay station sends switch indicating information to target relay station again, with switching identifier (if being assigned with in MOB_BSHO-RSP) and start-up time that the notification target relay station is assigned with, the form of switch indicating information is as shown in table 1.After said process is finished, former service relay stations stop with portable terminal between communicate by letter.

Step S603: the down link of portable terminal and target relay station or base station carries out synchronously, the main purpose of this process is to make portable terminal obtain target relay station or the up link of base station and the transmission parameter of down link, if from MOB_NBR-ADV message, obtain sign, operating frequency, DCD (the Downlink Channel Descriptor of target relay station or base station before the portable terminal, downlink channel descriptor), UCD (Uplink Channel Descriptor, uplink channel descriptor) parameter then can be accelerated synchronous process.

Step S604: finish network and reenter process, the main purpose of this process is to make portable terminal and target relay station or base station obtain the other side's relevant information respectively, prepares for follow-up normal information, and this process comprises:

Rebuild in the upright process at Business Stream, portable terminal is set up the type and the qos parameter thereof of requested service stream and Business Stream by traffic request message, target BS is set up at Business Stream and is agreed in the response message or refuse to set up Business Stream, and portable terminal is set up in the acknowledge message at Business Stream response message is confirmed.

Step S605: former service relay stations stop with portable terminal between communicate by letter and context, context for example is the information in the formation, ARQ (Automatic Repeat Request inserts request) state machine, counter, timer or head compression relevant information etc.

In the embodiment shown in fig. 6, what provide service for portable terminal is former service relay stations, if what provide service for portable terminal is former serving BS, then the step of Qie Huaning and each step shown in Figure 6 are basic identical, as long as change communicating by letter of carrying out between portable terminal and the former service relay stations into carry out between portable terminal and the former serving BS communicate by letter.

Need to prove that though what provide service for portable terminal among the embodiment shown in Figure 6 is high ability relay station, high ability relay station also can possess the ability of low ability relay station, i.e. the message that receives of transparent transmission.

In the embodiment shown in fig. 6, if switching target be and the target relay station of former service relay stations in same cells, then needn't carry out context and stop, can omit step S605; If switching target is and the target relay station of former service relay stations in different districts, then in step S601, the tabulation that former service relay stations provides can be the tabulation of neighbours base station and/or the tabulation of the relay station in these neighbours' base station ranges, former service relay stations can obtain these list informations to former serving BS request, if former serving BS does not have these list informations or list information substantial, out-of-date, then can obtain these list informations to core net.

Fig. 7 is the flow chart of the embodiment of the former service relay stations changing method of initiating.In this embodiment, the relay station that initiate to switch is high ability relay station, is another relay station in base station, the same sub-district or another relay station of different districts for high ability relay station provides the base station that is of service, the switching target of portable terminal.Wherein, high ability relay station can change the message content of MAC, has the ability of generation, modification or termination for the signaling that relates in the handoff procedure.Former service relay stations is initiated the reason switched and can be moved in the service range of another one relay station by the service range of former service relay stations or the coverage of another one base station for portable terminal, for making portable terminal obtain better service quality, the load of perhaps former service relay stations self is excessive, perhaps the transmitting power of former service relay stations reduces the reasons such as signal weakening that cause portable terminal, and former service relay stations can be replaced by the relay station or the base station of its service for portable terminal.

As shown in Figure 7, this embodiment comprises following several steps:

Step S701: carry out switching target reselection procedure process, the main purpose of this process is to make portable terminal obtain the tabulation and the information thereof of neighbours' relay station or neighbours base station, can be realized by following manner:

Step S702: initiation of switching and judging process, the main purpose of this process are to make portable terminal select a target relay station or target BS from candidate target relay station or candidate target BS, can be realized by following manner:

If former service relay stations has obtained the up-to-date professional providing capability of at least one candidate target relay station or base station, handoff procedure is optimized, switch relevant informations such as back authentication method indication, then can directly send handoff request message MOB_BSHO-REQ to portable terminal, otherwise, former service relay stations sends the handoff parameter request message to former serving BS, to ask the up-to-date professional providing capability of at least one candidate target relay station or base station, handoff procedure is optimized, switch relevant informations such as back authentication method indication, former serving BS returns the handoff parameter response message to former service relay stations, carry the up-to-date professional providing capability of at least one candidate target relay station or base station in the handoff parameter response message, handoff procedure is optimized, switch relevant informations such as back authentication method indication, former service relay stations sends handoff request message MOB_BSHO-REQ to portable terminal again, MOB_BSHO-REQ message can be generated by former serving BS, also can be generated by former service relay stations;

If the switching target of portable terminal is a target relay station, information such as the switching target notice that then former serving BS will be selected portable terminal provides serving base station for target relay station, for providing serving base station, target relay station sends switch indicating information to target relay station again, with switching identifier (if being assigned with in MOB_BSHO-RSP) and start-up time that the notification target relay station is assigned with, the form of switch indicating information is as shown in table 1.

Step S703: the down link of portable terminal and target relay station or base station carries out synchronously, the main purpose of this process is to make portable terminal can obtain the up link of target relay station or base station and the transmission parameter of down link, if from MOB_NBR-ADV message, obtain the sign of target relay station or base station before the portable terminal, operating frequency, DCD (Downlink Channel Descriptor, downlink channel descriptor), UCD (Uplink Channel Descriptor, uplink channel descriptor) parameter then can be accelerated synchronous process.

Step S704: finish network and reenter process, the main purpose of this process is to make portable terminal and target relay station or base station obtain the other side's relevant information respectively, prepares for follow-up normal information, and this process comprises:

Step S705: former service relay stations stop with portable terminal between communicate by letter and context, context for example is the information in the formation, ARQ (Automatic Repeat Request inserts request) state machine, counter, timer or head compression relevant information etc.

Need to prove, though what provide service for portable terminal among the embodiment shown in Figure 7 is high ability relay station, but high ability relay station also can possess the ability of low ability relay station, be the message that transparent transmission receives, if low ability relay station initiates to switch, then it can at first send a request message to former serving BS, after former serving BS generation MOB_BSHO-REQ message, send to former service relay stations, former service relay stations sends MOB_BSHO-REQ message to portable terminal again.

In the embodiment shown in fig. 7, if switching target be and the target relay station of former service relay stations in same cells, then needn't carry out context and stop, can omit step S705; If switching target is and the target relay station of former service relay stations in different districts, then in step S701, the tabulation that former service relay stations provides can be the tabulation of neighbours base station and/or the tabulation of the relay station in these neighbours' base station ranges, former service relay stations can obtain these list informations to former serving BS request, if former serving BS does not have these list informations or list information substantial, out-of-date, then can obtain these list informations to core net.

Fig. 8 is the flow chart of the embodiment of the former serving BS changing method of initiating.In this embodiment, for portable terminal provides the low ability relay station that is of service, be another relay station in base station, the same sub-district or another relay station of different districts for low ability relay station provides the base station that is of service, the switching target of portable terminal.Wherein, low ability relay station can only carry out transparent transmission to message, does not change the message content of MAC, does not have the ability that generates, revises or stop for the signaling that relates in the handoff procedure.Former serving BS is initiated the reason switched and can be moved in the service range of another one relay station by the service range of the low ability relay station of former service or the coverage of another one base station for portable terminal, for making portable terminal obtain better service quality, the load of perhaps former serving BS self is excessive, perhaps the transmitting power of former serving BS reduces the reasons such as signal weakening that cause portable terminal, and former serving BS can be replaced by the relay station or the base station of its service for portable terminal.

As shown in Figure 8, this embodiment comprises following several steps:

Step S801: carry out switching target reselection procedure process, the main purpose of this process is to make portable terminal obtain the tabulation and the information thereof of neighbours' relay station or neighbours base station, can be realized by following manner:

Step S802: initiation of switching and judging process, the main purpose of this process are to make portable terminal select a target relay station or target BS from candidate target relay station or candidate target BS, can be realized by following manner:

Former serving BS sends handoff request message MOB_BSHO-REQ to former service relay stations, and former service relay stations is given portable terminal with the MOB_BSHO-REQ forwards, carries the information of at least one candidate target relay station or base station in the MOB_BSHO-REQ message;

After said process is finished, former serving BS stop with portable terminal between communicate by letter.

Need to prove that the MOB_HO-IND message that portable terminal sends can have various states,, represent that then portable terminal will carry out switching if for discharging former service relay stations state, stop with former serving BS between communicate by letter; If be disarmed state, then former serving BS resends MOB_BSHO-RSP message, to recommend candidate target relay station or base station again; If be the cancellation state, then portable terminal and former serving BS all will be cancelled handover operation, return to normal operating conditions.

Need to prove that also candidate target relay station that former serving BS provides or base station can be identical in neighbours' relay station or neighbours base station that step S801 obtains with portable terminal, also can part identical, can also be inequality fully.

Step S803: the down link of portable terminal and target relay station or base station carries out synchronously, the main purpose of this process is to make portable terminal obtain target relay station or the up link of base station and the transmission parameter of down link, if from MOB_NBR-ADV message, obtain sign, operating frequency, DCD (the Downlink Channel Descriptor of target relay station or base station before the portable terminal, downlink channel descriptor), UCD (Uplink Channel Descriptor, uplink channel descriptor) parameter then can be accelerated synchronous process.

Step S804: finish network and reenter process, the main purpose of this process is to make portable terminal and target relay station or base station obtain the other side's relevant information respectively, prepares for follow-up normal information, and this process comprises:

Step S805: former serving BS stop with portable terminal between communicate by letter and context, context for example is the information in the formation, ARQ (Automatic Repeat Request inserts request) state machine, counter, timer or head compression relevant information etc.

In the embodiment shown in fig. 8, what provide service for portable terminal is former service relay stations, if what provide service for portable terminal is former serving BS, then the step of Qie Huaning and each step shown in Figure 8 are basic identical, as long as change communicating by letter of carrying out between portable terminal and the former service relay stations into carry out between portable terminal and the former serving BS communicate by letter.

In the embodiment shown in fig. 8, if switching target be and the target relay station of former service relay stations in same cells, then needn't carry out context and stop, can omit step S805; If switching target is and the target relay station of former service relay stations in different districts that then in step S801, the tabulation that former serving BS provides can be the tabulation of neighbours base station and/or the tabulation of the relay station in these neighbours' base station ranges.

Need to prove that in the embodiment shown in fig. 8, former service relay stations can be high energy power relay station, it also can carry out transparent transmission to the message relevant with handoff procedure that receives.

First switching node can also be relay station, switching target can be relay station or base station, for providing the former service node of service, relay station can be relay station or base station, promptly, provide new relay station or base station in the variable more same sub-district of former service relay stations of service for relay station, new relay station or base station in the also variable more same sub-district of former serving BS.Switching can be initiated by relay station, also can be initiated by former service relay stations or former serving BS.

Need to prove, if be transformed to new relay station or base station for first switching node provides the former service relay stations of service or former serving BS, then accepting first switching node provides second switching node of service can select together to switch with first switching node, also can select different switching targets, can also select not switch.Wherein, after selecting together to switch, first switching node after the switching still provides service for second switching node; After selecting different switching targets, what provide service for second switching node is new relay station or base station; After selecting not switch, what provide service for second switching node is former service relay stations or the former serving BS that service is provided for first switching node.

Fig. 9 is the flow chart of first embodiment of the changing method of relay station initiation.In this embodiment, for relay station provide service for the base station, the switching target of relay station is another relay station in base station, the same sub-district or another relay station of different districts.The reason that relay station initiates to switch can move in the coverage of another one base station for the coverage of relay station by former serving BS, perhaps move to the service range of another one relay station, relay station is in order to obtain better service quality, and the relay station or the base station of its service is replaced by in request.

As shown in Figure 9, this embodiment comprises following several steps:

Step S901: carry out switching target reselection procedure process, the main purpose of this process is to make relay station obtain the tabulation and the information thereof of neighbours' relay station or neighbours base station, can be realized by following manner:

Relay station obtains the tabulation of neighbours' relay station or neighbours base station from neighbours' broadcast MOB_NBR-ADV, MOB_NBR-ADV message is the broadcast that former serving BS sends, all relay stations or portable terminal in the service range of former serving BS can receive, wherein, relay station can obtain operator's identifier from MOB_NBR-ADV message, the config update counter, divide block identification, total piecemeal number, the number of neighbor site, the relevant information of each neighbor site, relevant information can comprise the physical characteristic identifier of each website, frequency allocation situation, the EIRP of website, BSID, the leading numbering of signal, the handoff procedure parameters optimization, supported dispatching services type, DCD config update counting, UCD config update counting and security information, certainly, these information are optional a bit, in addition, relay station is the acquisition MOB_NBR-ADV message of property at interval, and the neighbours' relay station in the MOB_NBR-ADV message or the tabulation of neighbours base station might be upgraded;

Relay station optionally scans or measures neighbours' relay station or neighbours base station, for example, the target that relay station can be selected scanning or measure from a plurality of tabulations that obtain, in scanning or the measuring process, relay station carries out synchronously scanning or neighbours' relay station of measuring or the down link of neighbours base station, and downstream signal is measured;

If relay station is thought the insufficient or other reasons of information that obtains, can also be on the basis of scanning, relay station continues the neighbours' relay station that is scanned or the up link of neighbours base station are found range, and to obtain ranging parameters, this process is called associating.

By above-mentioned steps, relay station has obtained the information of neighbours' relay station or neighbours base station.

Step S902: initiation of switching and judging process, the main purpose of this process are to make relay station select a target relay station or target BS from candidate target relay station or candidate target BS, can be realized by following manner:

Relay station sends handoff request message MOB_RSHO-REQ to former serving BS, and MOB_RSHO-REQ message is represented relay station request candidate target relay station or base station;

Former serving BS returns the information of carrying at least one candidate target relay station or base station in the switching response message MOB_BSHO-RSPMOB_BSHO-RSP message to relay station;

Relay station is assessed candidate target relay station or base station, and to former serving BS transmission switch indicating information MOB_HO-IND, MOB_HO-IND message is represented the target relay station of relay station selection or the decision of base station, that is, target relay station or the base station of selecting which relay station or base station conduct to switch is described.

If the switching target of relay station is a target relay station, information such as the switching target notice that then former serving BS will be selected relay station provides serving base station for target relay station, for providing serving base station, target relay station sends switch indicating information to target relay station again, with switching identifier (if being assigned with in MOB_BSHO-RSP) and start-up time that the notification target relay station is assigned with, the form of switch indicating information is as shown in table 1.

After said process is finished, former serving BS stop with relay station between communicate by letter.

Need to prove that the MOB_HO-IND message that relay station sends can have various states,, represent that then relay station will carry out switching if for discharging former service relay stations state, stop with former serving BS between communicate by letter; If be disarmed state, then former serving BS resends MOB_BSHO-RSP message, to recommend candidate target relay station or base station again; If be the cancellation state, then relay station and former serving BS all will be cancelled handover operation, return to normal operating conditions.

Need to prove that also candidate target relay station that former serving BS provides or base station can be identical in neighbours' relay station or neighbours base station that step S901 obtains with relay station, also can part identical, can also be inequality fully.

Step S903: the down link of relay station and target relay station or base station carries out synchronously, the main purpose of this process is to make relay station obtain target relay station or the up link of base station and the transmission parameter of down link, if from MOB_NBR-ADV message, obtain sign, operating frequency, DCD (the Downlink Channel Descriptor of target relay station or base station before the portable terminal, downlink channel descriptor), UCD (Uplink Channel Descriptor, uplink channel descriptor) parameter then can be accelerated synchronous process.

Step S904: finish network and reenter process, the main purpose of this process is to make relay station and target relay station or base station obtain the other side's relevant information respectively, prepares for follow-up normal information, and this process comprises:

Carry out CDMA sign indicating number ranging process, a purpose of this process is to make the up link of relay station and target relay station or base station reach synchronous;

Target relay station or base station are that relay station distributes range measurement resource;

Relay station sends distance measurement request message RNG-REQ to target relay station or base station, carries the sign of the sign of relay station, former serving BS or relay station and the sign of range finding type among the RNG-REQ, and the sign of range finding type represents to switch range finding;

Ranging response message RNG-RSP is returned to relay station in target relay station or base station, RNG-RSP message can carry target relay station or the base station is basic CID (ConnectionIdentifier connects identifier), main management CID, target relay station or the relevant informations such as service in base station providing capability, handoff procedure optimization that relay station distributes;

Wherein, in the re-authentication process, relay station sends authentication request message to target BS, and authentication request message is carried sign, the digital certificate of relay station;

If target BS assert that relay station is legal, then to relay station return authentication response message, target BS distributes authenticate key to relay station in authentication response message;

After relay station is received authentication response message, just can further send secret key request message, to the target base station requests business cipher key;

Target BS is to relay station " return " key" response message, and target BS is given relay station distribution service key in key response message.

In basic capability negotiation process, the relay station handling capacity is consulted system parameters and the function that request can be supported to target base station requests oneself, and the target BS handling capacity consults to reply the function notice relay station that target BS is agreed.

In heavy enrollment process, the IP version that relay station oneself is supported to the target BS registration by register request message, management mode etc., IP version and management mode that target BS is supported to the relay station reporting system in enrollment response message.

Rebuild in the upright process at Business Stream, relay station is set up the type and the qos parameter thereof of requested service stream and Business Stream by traffic request message, target BS is set up at Business Stream and is agreed in the response message or refuse to set up Business Stream, and relay station is set up in the acknowledge message at Business Stream response message is confirmed.

In above-mentioned each process,, then reenter in the process and just can omit corresponding step at network if informed in the handoff procedure parameters optimization in RNG-RSP message that relay station can dispense some step.

If switching target is a target relay station, then the network subsequent step that reenters process also can comprise successively: re-authentication process, basic capability negotiation process, heavy enrollment process, Business Stream are rebuild upright process.No matter target relay station is high ability relay station or low ability relay station, it can the transparent transmission relay station and interactive messages between the serving BS of service is provided for target relay station, so, finish the subsequent step that network reenters process for target relay station provides the serving BS of service can act on behalf of target relay station.

Need to prove that if target relay station or base station obtain the time that relay station will be found range in advance, then needn't carry out the range finding of CDMA sign indicating number, non-competing range measurement resource can directly be distributed for relay station in target relay station or base station.

Step S905: former serving BS stop with portable terminal between communicate by letter and context, context for example is the information in the formation, ARQ (Automatic Repeat Request inserts request) state machine, counter, timer or head compression relevant information etc.

In the embodiment shown in fig. 9, what the relay station that switches for initiation provided service is former serving BS, if what the relay station that switches for initiation provided service is a service relay stations, then the step of Qie Huaning and each step shown in Figure 9 are basic identical, as long as change communicating by letter of carrying out between relay station and the former serving BS into receive and dispatch between service relay stations forward relay station and the former serving BS message.

In the embodiment shown in fig. 9,, then needn't carry out context and stop, can omit step S905 if switching target is the target relay station of former serving BS service; If switching target is the target relay station in the different districts, then in step S901, the tabulation that former serving BS provides can be the tabulation of neighbours base station and/or the tabulation of the relay station in these neighbours' base station ranges, if former serving BS does not have these list informations or list information substantial, out-of-date, then can obtain these list informations to core net.

In the embodiment shown in fig. 9, because when relay station is changed serving BS, the portable terminal of relay station service does not also know to change for its serving base station, so, relay station is after finishing context termination step, also need to send portable terminal parameter updating request message to target BS, target BS can return portable terminal parameter update response message to relay station, the parameter update response message can carry the parameter update information of all portable terminals of relay station service, and relay station sends RNG-RSP message to all portable terminals of serving respectively after receiving the parameter update response message.

Target BS is after receiving portable terminal parameter updating request message, can also directly generate RNG-RSP message, RNG-RSP message can be carried the parameter update information of all portable terminals of relay station service, relay station is transmitted RNG-RSP message to all portable terminals of service respectively after receiving RNG-RSP message, and portable terminal parameter updating request message format and portable terminal parameter update response message format are respectively shown in table 4 and table 5.

Grammer	Size (unit: bit)	Explanation
Grammer	Size (unit: bit)	Explanation	MS_Para-REQ message format ()	-	-
Management Message Type	8	Type of message	MS_Para-REQ message format ()	-	-
Management Message Type	8	Type of message	BSID	48	The BSID of former cell base station

N_MS	8	The MS number of required parameter
N_MS	8	The MS number of required parameter	For(j＝0；j＜N_MS；j++){
MS MAC	48	The MS MAC Address	For(j＝0；j＜N_MS；j++){
MS MAC	48	The MS MAC Address	}
Padding	6	Be 0	}
Padding	6	Be 0	TLV encoded information	2	The TLV coded message comprises authentication security information
}			TLV encoded information	2

Table 4 portable terminal parameter updating request message format

Grammer	Size (unit: bit)	Explanation
Grammer	Size (unit: bit)	Explanation	MS_Para-REQ message format ()	-	-
Management Message Type	8	Type of message	MS_Para-REQ message format ()	-	-
Management Message Type	8	Type of message	BSID	48	The BSID of former cell base station
N_MS	8	The MS number of required parameter	BSID	48	The BSID of former cell base station
N_MS	8	The MS number of required parameter	For(j＝0；j＜N_MS；j++){		If this message is to be used for switching
MS MAC	48	The MS MAC Address	For(j＝0；j＜N_MS；j++){		If this message is to be used for switching
MS MAC	48	The MS MAC Address	Basic CID	16	The basic identifier that connects
Primary management CID	16	Main management connects identifier	Basic CID	16	The basic identifier that connects
Primary management CID	16	Main management connects identifier	HO process optimization	16	Handoff procedure is optimized
}			HO process optimization	16	Handoff procedure is optimized
}			Padding	6	Be 0
TLV encoded information	2	The TLV coded message comprises authentication security information	Padding	6	Be 0
TLV encoded information	2		}

Table 5 portable terminal parameter update response message format

In addition, after relay station is finished switching, and before target BS sends portable terminal parameter updating request message, can judge that also accepting relay station originally provides the portable terminal of service whether also accepting the service that relay station provides.Relay station can be taked such judgment mode, promptly, if relay station can periodically receive the distance measurement request of portable terminal, illustrate that then portable terminal also accepting the service that relay station provides, otherwise, illustrate that portable terminal do not accepted the service that relay station provides, relay station can also be taked such judgment mode, promptly, the portable terminal that the relay station request was accepted to serve originally carries out periodic distance measurement request, if portable terminal can send distance measurement request to relay station, illustrates that then portable terminal also accepting the service that relay station provides, otherwise, illustrate that portable terminal do not accepted the service that relay station provides.If relay station determines that accepting relay station originally provides the portable terminal of service also accepting the service that relay station provides, then send portable terminal parameter updating request message to target BS, otherwise, needn't send portable terminal parameter updating request message to target BS.

In the embodiment shown in fig. 9, switching is initiated by relay station, in actual applications, the base station also can initiate to switch, the difference of handoff procedure and process shown in Figure 9 is, in step S902, former serving BS at first sends handoff request message MOB_BSHO-REQ to relay station, carry the information of at least one candidate target relay station or base station in the MOB_RSHO-REQ message, relay station is assessed candidate target relay station or base station, and to former serving BS transmission switch indicating information MOB_HO-IND, MOB_HO-IND message is represented the target relay station of relay station selection or the decision of base station, that is, target relay station or the base station of selecting which relay station or base station conduct to switch is described.

In the process that relay station initiates to switch, the portable terminal of relay station service also can initiate to switch, in this case, relay station can received MOB_HO-IND message that portable terminal sends and with after portable terminal stops to communicate by letter, send MOB_HO-IND message to the base station again.Below in conjunction with embodiment, in this case changing method is described.

Figure 10 is the flow chart of second embodiment of the changing method of relay station initiation.In this embodiment, the relay station that is of service is provided for portable terminal, the base station that is of service is provided for relay station, the switching target of portable terminal is another relay station in base station, the same sub-district or another relay station of different districts, and the switching target of relay station is another relay station in base station, the same sub-district or another relay station of different districts.The reason that portable terminal initiates to switch can move in the service range of another one relay station for the service range of portable terminal by former service relay stations, perhaps move to the coverage of another one base station, portable terminal is in order to obtain better service quality, and the relay station or the base station of its service is replaced by in request.The reason that relay station initiates to switch can move in the coverage of another one base station for the coverage of relay station by former serving BS, perhaps move to the service range of another one relay station, relay station is in order to obtain better service quality, and the relay station or the base station of its service is replaced by in request.

As shown in figure 10, this embodiment comprises following several steps:

Step S1001: carry out switching target reselection procedure process, the main purpose of this process is to make relay station obtain the tabulation and the information thereof of neighbours' relay station or neighbours base station, can be realized by following manner:

If relay station is thought the insufficient or other reasons of information that obtains, can also be on the basis of scanning, portable terminal continues the neighbours' relay station that is scanned or the up link of neighbours base station are found range, and to obtain ranging parameters, this process is called associating.

Step S1002: initiation of switching and judging process, the main purpose of this process are to make relay station select a target relay station or target BS from candidate target relay station or candidate target BS, can be realized by following manner:

Referring again to Figure 10, if relay station is before sending switch indicating information MOB_HO-IND to former serving BS, receive the MOB_MSHO-REQ message that portable terminal sends, then relay station will stop the follow-up switching flow of oneself, the request of priority treatment portable terminal, with after portable terminal stops to communicate by letter, carry out follow-up switching flow again.Relay station stops follow-up switching flow can adopt such means, promptly, relay station can send MOB_HO-IND message to the base station, the MOB_HO-IND condition of information is a disarmed state, after the base station receives the MOB_HO-IND message of disarmed state, can be again to relay station recommended candidate target BS or relay station, so repeatedly, can guarantee that before portable terminal and relay station stop to communicate by letter relay station can continue to keep communicating by letter with the base station.Relay station can also be cancelled this switching flow in MOB_HO-IND message, if can carry out follow-up flow process, relay station can continue switching flow to base station requests again.

Need to prove that also candidate target relay station that former serving BS provides or base station can be identical in neighbours' relay station or neighbours base station that step S1001 obtains with relay station, also can part identical, can also be inequality fully.

Step S1003: the down link of relay station and target relay station or base station carries out synchronously, the main purpose of this process is to make relay station obtain target relay station or the up link of base station and the transmission parameter of down link, if from MOB_NBR-ADV message, obtain sign, operating frequency, DCD (the Downlink Channel Descriptor of target relay station or base station before the portable terminal, downlink channel descriptor), UCD (Uplink Channel Descriptor, uplink channel descriptor) parameter then can be accelerated synchronous process.

Step S1004: finish network and reenter process, the main purpose of this process is to make relay station and target relay station or base station obtain the other side's relevant information respectively, prepares for follow-up normal information, and this process comprises:

Step S1005: former serving BS stop with portable terminal between communicate by letter and context, context for example is the information in the formation, ARQ (Automatic Repeat Request inserts request) state machine, counter, timer or head compression relevant information etc.

In the embodiment shown in fig. 10, what provide service for relay station is former serving BS, if what provide service for portable terminal is a service relay stations, then the step of Qie Huaning and each step shown in Figure 10 are basic identical, as long as change communicating by letter of carrying out between relay station and the former serving BS into receive and dispatch between service relay stations forward relay station and the former serving BS message.

In the embodiment shown in fig. 10,, then needn't carry out context and stop, can omit step S1005 if switching target is the target relay station of former serving BS service; If switching target is the target relay station in the different districts, then in step S1001, the tabulation that former serving BS provides can be the tabulation of neighbours base station and/or the tabulation of the relay station in these neighbours' base station ranges, if former serving BS does not have these list informations or list information substantial, out-of-date, then can obtain these list informations to core net.

In the embodiment shown in fig. 10, switching is initiated by relay station and portable terminal, in actual applications, switching can be initiated by former serving BS or former service relay stations, and former serving BS or former service relay stations can be simultaneously or initiated switching at relay station and portable terminal according to the order of sequence.

Above-mentioned several embodiment just realizes several typical embodiment of the inventive method, need to prove, the present invention also has the embodiment of multiple realization changing method.For example, switching can be initiated by switching node, can be initiated by the service node that service is provided for switching node, can be initiated by the service node that service is provided for service node, by that analogy, even can also be initiated by switching target.When switching was initiated by switching target, switching target can send handoff request message by the service node that service is provided for switching node.In addition, no matter be the service node that service is provided for switching node, or switching target, if do not obtain up-to-date relevant information or relevant information insufficient, can be to serving BS that service is provided for portable terminal or the corresponding information of core network requests.

The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims

1. changing method based on relay system is characterized in that comprising:

First switching node is selected a switching target from the candidate switching target that obtains, specifically comprise: obtain the information of at least one candidate switching target, the candidate switching target is assessed, and notify the switching target of selecting to former service node;

The down link of first switching node and switching target carries out synchronously;

Finish network and reenter process, specifically comprise: carry out CDMA sign indicating number ranging process, make the up link of first switching node and switching target reach synchronous; Switching target is that first switching node distributes range measurement resource; First switching node sends distance measurement request message to switching target; Switching target returns ranging response message to first switching node; If switching target obtains the time that first switching node will be found range in advance, then needn't carry out the range finding of CDMA sign indicating number, switching target directly is that first switching node distributes non-competing range measurement resource;

Wherein, first switching node is a portable terminal, and switching target is relay station or base station; Perhaps, first switching node is a relay station, and switching target is relay station or base station.

2. the changing method based on relay system as claimed in claim 1 is characterized in that first switching node is selected a switching target from the candidate switching target that obtains process is specifically realized by following step:

First switching node sends handoff request message to former service node, and the former service node of described handoff request message request provides the information of at least one candidate switching target;

Former service node returns switching response message to first switching node, carries the information of at least one candidate switching target in the described switching response message;

First switching node is assessed the candidate switching target, and sends switch indicating information, the decision of carrying the switching target of selection in the described switch indicating information to former service node.

3. the changing method based on relay system as claimed in claim 1 is characterized in that first switching node is selected a switching target from the candidate switching target that obtains process is specifically realized by following step:

Former service node sends handoff request message, the information of carrying at least one candidate switching target in the described handoff request message to first switching node;

4. as claim 2 or 3 described changing methods, it is characterized in that:, then also comprise if described switching target is a target relay station based on relay system:

The former serving BS that provides service for first switching node with communicate for switching target provides the serving BS of service;

For providing the serving BS of service, switching target sends switch indicating information to target relay station.

5. the changing method based on relay system as claimed in claim 1, it is characterized in that: if first switching node is the second switching node service before switching, and finish before the step of selecting a switching target at first switching node, second switching node is being selected the step of a switching target, after then first switching node waits until that second switching node is finished the step of selecting a switching target, finish the step of selecting a switching target again.

6. the changing method based on relay system as claimed in claim 5, it is characterized in that: if first switching node is received the handoff request message that second switching node sends before sending switch indicating information, then first switching node is to send the switch indicating information of disarmed state or cancellation state for first switching node provides the service node of service before switching.

7. the changing method based on relay system as claimed in claim 5 is characterized in that: if first switching node receives the switch indicating information that Section Point sends, then first switching node stop with Section Point between communicate by letter.

8. the changing method based on relay system as claimed in claim 5, it is characterized in that: if first switching node receives the switch indicating information that Section Point sends, then to before switching, sending handoff request message for first switching node provides the service node of service.

9. the changing method based on relay system as claimed in claim 5 is characterized in that: second switching node also comprises after finishing the step of selecting a switching target:

The down link of the switching target of second switching node and selection carries out synchronously;

Finish network and reenter process.

10. the changing method based on relay system as claimed in claim 1 is characterized in that: if first switching node for before switching for second switching node provides service, after then finishing network and reentering process, also comprise:

First switching node sends the second switching node parameter updating request message to switching target;

Switching target returns second switching node parameter update response message or the ranging response message to first switching node;

First switching node sends or transmits ranging response message to second switching node.

11. the changing method based on relay system as claimed in claim 1 is characterized in that: if first switching node before switching for second switching node provides service, after then finishing network and reentering process, also comprise:

First switching node judges whether second switching node is also accepting the service that first switching node provides;

If first switching node determines that second switching node also accepting the service that first switching node provides, then sends the second switching node parameter updating request message to switching target;

12. the changing method based on relay system as claimed in claim 11, it is characterized in that: first switching node judges that the service manner whether second switching node also provides at acceptance first switching node is: first switching node judges whether the distance measurement request message that receives the transmission of second switching node of property at interval, if then determine the service that second switching node also provides at acceptance first switching node.

13. the changing method based on relay system as claimed in claim 11 is characterized in that: first switching node judges that the service manner whether second switching node also provides at acceptance first switching node is:

The first switching node request, second switching node is the transmission distance measurement request message of property at interval;

If first switching node is the distance measurement request message that receives the transmission of second switching node of property at interval, then determine the service that second switching node also provides at acceptance first switching node.

14. as any described changing method of claim 10-13 based on relay system, it is characterized in that: after each second switching node is received ranging response message, also comprise: carry out the subsequent step that network reenters process between second switching node and the switching target.

15. the changing method based on relay system as claimed in claim 1 is characterized in that first switching node also comprises before obtaining the candidate switching target: carry out switching target reselection procedure process.

16. the changing method based on relay system as claimed in claim 15 is characterized in that carrying out switching target reselection procedure process and is realized by following step:

First switching node obtains the neighbor node tabulation from neighbours' broadcast;

Scanning or measure neighbor node is with the information of the neighbor node that obtains to be scanned or to measure.

17. the changing method based on relay system as claimed in claim 16 is characterized in that carrying out switching target reselection procedure process and also comprises:

First switching node is to the customizing messages of former service node request neighbor node;

Former service node returns the customizing messages of request to first switching node.

18. the changing method based on relay system as claimed in claim 1 is characterized in that also comprising: former service node termination is connected and context with all of first switching node.