CN101384068B

CN101384068B - Mobile station switching parameter negotiation method and device

Info

Publication number: CN101384068B
Application number: CN200710076948A
Authority: CN
Inventors: 阳建军; 刘丽娜; 曾可
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2007-09-07
Filing date: 2007-09-07
Publication date: 2012-10-17
Anticipated expiration: 2027-09-07
Also published as: CN101384068A

Abstract

The embodiment of the invention discloses a parameter switching consultation method of a traveling carriage and a device, and aims at the demand of reduction of relative switching delay when the traveling carriage switches towards a target relay station. A disclosed mode goal base station gains the special parameter information relative to the switching distributed by the target relay station through the information alternation with the target relay station, the traveling carriage is enabled to be quickly connected when switches towards the target relay station and the time delay is reduced.

Description

Mobile station switching parameter negotiation method and device

Technical Field

The present invention relates to the field of wireless communication, and in particular, to a method and an apparatus for negotiating handover parameters of a mobile station.

Background

WiMAX (Worldwide interoperability for Microwave Access) system based on IEEE802.16 technical standard has attracted market attention in recent years, and the system can provide higher data transmission rate and wider signal coverage than 3G system.

According to WiMAX network application planning, the reasonable coverage radius of a Base Station (BS) in an urban area is about several kilometers, and the effective data transmission rate thereof decreases as the distance between a Mobile Station (MS) and the BS increases. To achieve a better balance between cost and performance, the IEEE802.16 standards institute group has established a mobile multihopreliy (mmr) research group starting at 9 months 2005 to investigate the feasibility of employing relay (relay) technology in IEEE802.16 systems. The main task of the relay task group (relay task group) is to expand the 802.16e protocol, and currently, a first version draft of the 802.16j protocol is formed.

802.16j is an extension of 802.16e, and the system performance is backward compatible with 802.16e, and the system architecture is shown in fig. 1. In 802.16j, the MS may be connected to the BS to access the network, or may be connected to an RS (relay station); the RS is accessed to the network through the BS, and the RS can be connected with each other. Through the use of the RS, the user throughput and the capacity and reliability of the system can be improved and the coverage of the network can be increased.

In ieee802.16j, RSs are classified into localized RSs and distributed RSs. In the centralized scheduling, a BS determines resource allocation and generates a corresponding MAP (mapping table), and resources of an RS are managed by the BS. In distributed scheduling, the BS and the RS decide bandwidth allocation and generate corresponding MAPs in different cells, respectively, that is, the RS has the capability of allocating resources by itself. The RS operation mode can be divided into a transparent mode and a non-transparent mode, where the former (transparent mode) refers to that the RS cannot transmit downlink preamble (preamble), FCH (Frame Control Header), DL-MAP/UL-MAP (downlink mapping table/uplink mapping table), and DCD/UCD (downlink channel descriptor/uplink channel descriptor); the latter (non-transparent mode) means that RS can transmit preamble, FCH, DL-MAP/UL-MAP and DCD/UCD of downlink.

Under the condition of distributed RS, when MS needs to be switched to target RS, the adopted method flow specifically comprises the following steps:

step a: the MS initiates a switching request to a serving BS (serving base station, namely the base station which provides access service for the MS currently) through a MOB _ MSHO-REQ message;

step b: the serving BS obtains the information of the target BS through the interaction with the target BS;

in this step, since the target RS is in distributed scheduling, the target BS cannot know when the target RS allocates the dedicated ranging resource for the MS to allow the MS to access, that is, the target BS has no way to determine the fast ranging time, and the Serving BS can only obtain the information of the target BS through the interaction with the target BS.

Step c: the serving BS responds to the MS through the MOB _ BSHO-RSP message and carries the information of the target BS, and after receiving the response message, the MS accesses the target RS under the target BS in a competition-based mode.

In the process of implementing the present invention, the inventor finds that in the prior art, the MS does not acquire the parameters related to the handover allocated to the MS by the target RS, and can only access the target RS in a contention-based manner, which causes a significant delay when the MS accesses the target RS. This delay is unacceptable for high demand services, such as VOIP services. Therefore, a new technical solution is needed for negotiating handover parameters of a mobile station, and facilitating handover of an MS to a target RS (relay station), which can reduce handover delay.

Disclosure of Invention

The main problem to be solved by the embodiments of the present invention is to provide a method and an apparatus for negotiating handover parameters of a mobile station, so as to solve the problem of a long time delay in handover from the mobile station to a target relay station.

To solve the above technical problem, an embodiment of the present invention provides a method for negotiating handover parameters of a mobile station, where the method includes:

sending a switching parameter negotiation request to a target relay station;

receiving a switching parameter negotiation response of the target relay station, wherein the switching parameter negotiation response carries resources which are determined by the target relay station according to self resource scheduling and are used for allocating fast ranging to a mobile station;

the selection of the resources for fast ranging is that a service base station or a target base station sends a message to a filtered target relay station according to a switching parameter negotiation request reported by a mobile station, and requests the target relay station to allocate the resources for fast ranging for the mobile station; the filtered target relay station determines to distribute fast ranging resources to the mobile station according to the resource scheduling of the target relay station, and returns the fast ranging resources to the serving base station or the target base station through messages; and the service base station or the target base station makes comprehensive judgment according to the received fast ranging resources and selects the fast ranging resource of the fastest access network.

An embodiment of the present invention provides a radio access network, where the radio access network is used for mobile station handover parameter negotiation, and the radio access network includes:

a serving base station; and

a target relay station that can manage its own radio resources, communicably connected to the serving base station;

wherein, the service base station is used for receiving the switching request of the mobile station;

the serving base station is configured to send a negotiation request about the handover parameter of the mobile station to the target relay station after determining that the mobile station is handed over to the target relay station;

the serving base station is configured to receive a handover parameter negotiation response of the target relay station with respect to the mobile station, where the handover parameter negotiation response carries resources for allocating fast ranging to the mobile station, which are determined by the target relay station according to resource scheduling of the target relay station;

the selection of the resources for fast ranging is that a service base station sends a message to a filtered target relay station according to a switching parameter negotiation request reported by a mobile station, and requests the target relay station to allocate the resources for fast ranging for the mobile station; the filtered target relay station determines to distribute fast ranging resources to the mobile station according to the resource scheduling of the target relay station, and returns the fast ranging resources to the serving base station through messages; and the service base station makes comprehensive judgment according to the received fast ranging resources and selects the fast ranging resource of the fastest access network.

a target relay station which can manage its own radio resources, and

a target base station communicably connected to the target relay station;

wherein the target base station sends a negotiation request about the mobile station handover parameters to the target relay station;

the target relay station is used for returning a switching parameter negotiation response about the mobile station to the target base station, wherein the switching parameter negotiation response carries resources which are determined by the target relay station according to the resource scheduling of the target relay station and are used for allocating the fast ranging to the mobile station;

the selection of the resources for fast ranging is that a target base station sends a message to a filtered target relay station according to a switching parameter negotiation request reported by a mobile station, and requests the target relay station to allocate the resources for fast ranging for the mobile station; the filtered target relay station determines to distribute fast ranging resources to the mobile station according to the resource scheduling of the target relay station, and returns the fast ranging resources to the target base station through messages; and the target base station makes comprehensive judgment according to the received fast ranging resources and selects the fast ranging resource of the fastest access network.

a serving base station; and

a serving relay station communicably connected to the serving base station, an

A target base station communicably connected to the serving base station; and

a target relay station that can manage its own radio resources, and that is communicably connected to the target base station;

the service relay station is used for receiving a switching request of the mobile station;

the serving base station is used for receiving a request sent by the serving relay station and related to the handover of the mobile station;

a serving base station; and

a target base station communicably connected to the serving base station; and

Compared with the prior art, the method disclosed by the embodiment of the invention has the advantages that the target base station obtains the parameter information related to the special handover allocated by the target relay station for the mobile station through the message interaction between the target base station and the target relay station, so that the mobile station can be accessed quickly when being switched to the target relay station, and the handover delay is reduced.

Drawings

FIG. 1 is a flow chart of a prior art handoff;

FIG. 2 is a flow chart of a method according to an embodiment of the present invention;

FIG. 3 is a flowchart of a method according to a first embodiment of the present invention;

FIG. 4 is a flowchart of a method according to a second embodiment of the present invention;

FIG. 5 is a flowchart of a method according to a third embodiment of the present invention;

FIG. 6 is a flowchart of a method according to a fourth embodiment of the present invention;

FIG. 7 is a flowchart of a method according to a fifth embodiment of the present invention;

FIG. 8 is a flowchart of a method according to a sixth embodiment of the present invention;

FIG. 9 is a flowchart of a method according to a seventh embodiment of the invention;

FIG. 10 is a flowchart of a method according to an eighth embodiment of the present invention;

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

The invention is described in detail below with reference to the figures and the specific embodiments.

It should be noted that, in the 802.16j system, the RS currently providing the access service to the MS is referred to as a serving RS; since the RS can access the network through the BS, the BS providing the access system to the serving RS is referred to as a serving BS, the BS providing the access system to the target RS is referred to as a target BS, and the BS providing the access service to the serving RS and the target RS is referred to as a serving/target BS.

Fig. 2 is a flowchart of a method for facilitating handover of an MS to a target RS in an embodiment of the present invention, where the method includes:

step 201: sending a switching parameter negotiation request to a target relay station;

the target RS may manage its own resources, and the target BS or the serving/target BS cannot know the fast ranging time information allocated by the target RS to the MS, so that the target BS or the serving/target BS needs to interact with the message of the target RS to acquire the handover parameter information, such as the fast ranging time allocated by the target RS to the MS.

Where more than one target RS may be handed over by the MS, a request for allocating fast ranging time for the MS may be sent to the multiple target RSs.

Wherein, the switching parameter negotiation request carries the mobile station identifier. The mobile station identification may be the MAC address of the mobile station. The mobile station identity may be a base station assigned handover identity.

And adding the fast ranging time parameter in the switching parameter negotiation response.

Step 202: and receiving the switching parameter negotiation response of the target relay station. The fast ranging time parameter is carried in the handover parameter negotiation response.

Wherein, because the MS may switch to more than one target RS, it may receive the switch parameter negotiation response sent by multiple target RSs.

Further, fast ranging time is allocated to the MS and returned to the serving BS or the serving/target BS, and the serving BS or the serving/target BS may make a comprehensive judgment according to the received handover parameter negotiation response to select a handover parameter negotiation response, and send fast ranging time information carried in the selected handover parameter negotiation response to the MS. The MS can access the target RS using the fast ranging time information.

The present invention is described in more detail below with reference to a more specific example, which is taken as an example of an 802.16j system.

In the 802.16j system, the handover may be initiated by the MS or by the network side. The following description will be made by taking an example in which the MS initiates a handover.

Example one

In this embodiment, if the MS accesses the network through the RS, and if the target RS to be switched by the MS and the RS providing the access service to the MS are in the same BS, the specific switching process is shown in fig. 3, and includes:

step 301: MS initiates a switching request to a service RS through an MOB _ MSHO-REQ message;

wherein the MOB _ MSHO-REQ message carries an IDlist (ID list) of a target RS or BS to which the MS may handover.

Step 302: the service RS forwards the received MOB _ MSHO-REQ message to the service/target BS;

step 303: the service/target BS can make a selection on the ID list according to the measurement information reported by the MS or the load information reported by the neighbor cell RS or the BS, and the like, and sends an HO _ INF-REQ message to the filtered target RS to request the target RS to distribute the rapid ranging time for the MS; one or more filtered target RSs can be obtained; the serving/target BS may also implement allocation of a fast ranging time for the MS through a message other than the HO _ INF-REQ.

Step 304: the target RS determines to distribute fast ranging resources to the MS according to own resource scheduling, and returns fast ranging time information to the service/target BS through the HO _ INF-RSP message;

wherein, if only one target RS remains after the filtering in step 303, the target RS returns fast ranging time information to the serving/target BS through the HO _ INF-RSP message; if a plurality of target RSs remain after filtering in step 303, the RSs that received the HO _ INF-REQ message may all return fast ranging time information to the serving/target BS.

Step 305: if there are multiple target RSs that return the fast ranging time information in step 304, the serving/target BS may make a comprehensive judgment according to the received fast ranging time information to select one fast ranging time information, and then send the fast ranging time information carried by the MOB _ BSHO-RSP message to the serving RS; if there is one target RS returning the fast ranging time information in step 304, the serving/target BS transmits the fast ranging time information to the serving RS through the MOB _ BSHO-RSP message.

In the case that there are multiple target RSs that return fast ranging time information, the serving/target BS usually selects one fast ranging time information that can be returned by the target RS that enables the MS to access the network fastest, and sends the selected fast ranging time information to the serving RS through the MOB _ BSHO-RSP message. It should be noted that the present invention can also be implemented if the serving/target BS selects a second best fast ranging time information returned by the target RS for the MS to access the network to send to the serving RS through the MOB _ BSHO-RSP message.

Step 306: the serving RS transmits the received MOB _ BSHO-RSP message to the MS.

The serving RS may directly forward the received MOB _ BSHO-RSP message to the MS, or may perform a certain process to send the fast ranging time information carried in the MOB _ BSHO-RSP message to the MS.

Further, the MS can access the target RS using the fast ranging time information in its reception MOB _ BSHO-RSP message.

Step 307: MS sends MOB _ HO-IND to service RS to indicate that the switch is executed;

step 308: the service RS forwards the received MOB-HO-IND to the service BS;

step 309: after the time specified by the Fast ranging time expires, the MS receives the UL MAP of the target RS to obtain Fast ranging IE, and obtains the opportunity to send a ranging request message.

Example two

In this embodiment, the MS accesses the network through the BS, and if the target RS that the MS needs to switch is under the BS, the specific switching process is shown in fig. 4, and includes:

step 401: MS initiates a switching request to a service BS through an MOB _ MSHO-REQ message;

Step 402: the service/target BS can make a selection on the ID list according to the measurement information reported by the MS or the load information reported by the neighbor cell RS or the BS, and the like, and sends an HO _ INF-REQ message to the filtered target RS to request the target RS to distribute the rapid ranging time for the MS;

here, since the target RS to which the MS needs to be handed over is under the serving BS, the target BS thereof, i.e. the serving BS, i.e. the serving/target BS in this step is the same entity as the serving BS in step 401.

In this step, one or more filtered target RSs may be used; the serving/target BS may also implement allocation of a fast ranging time for the MS through a message other than the HO _ INF-REQ.

Step 403: the target RS determines to distribute fast ranging resources to the MS according to own resource scheduling, and returns fast ranging time information to the service/target BS through the HO _ INF-RSP message;

wherein, if only one target RS remains after the filtering in step 402, the target RS returns the fast ranging time information to the serving/target BS through the HO _ INF-RSP message; if a plurality of target RSs remain after filtering in step 402, the RSs receiving the HO _ INF-REQ message may all return fast ranging time information to the serving/target BS.

Step 404: if there are multiple target RSs that return the fast ranging time information in step 403, the serving/target BS may make a comprehensive judgment according to the received fast ranging time information to select one fast ranging time information, and then send the fast ranging time information carried by the MOB _ BSHO-RSP message to the MS; if there is one target RS returning the fast ranging time information in step 403, the serving/target BS transmits the fast ranging time information to the MS through the MOB _ BSHO-RSP message carrying the fast ranging time information.

In the case that there are multiple target RSs that return fast ranging time information, the serving/target BS generally selects one fast ranging time information that can be returned by the target RS that enables the MS to access the network fastest, and sends the selected fast ranging time information to the MS through the MOB _ BSHO-RSP message. It should be noted that the present invention can also be implemented if the serving/target BS selects a second best fast ranging time information returned by the target RS for the MS to access the network to send to the MS through the MOB _ BSHO-RSP message.

In this step, other messages may also be used to carry the fast ranging time information sent to the MS.

Step 405: the MS sends MOB _ HO-IND to the serving BS to indicate that the handover has been executed;

step 406: after the time specified by the Fast ranging time expires, the MS receives the UL MAP of the target RS to obtain Fast ranging IE, and obtains the opportunity to send a ranging request message.

EXAMPLE III

In this embodiment, if the target RS to be switched by the MS and the RS providing the access service to the MS are not in the same BS, the specific switching process is shown in fig. 5, and includes:

step 501: MS starts a switching request to a service RS through an MOB _ MSHO-REQ message;

Step 502: the service RS forwards the received MOB _ MSHO-REQ message to the service BS;

it should be noted that in this step, the serving RS may also perform certain processing on the MOB _ MSHO-REQ message instead of directly forwarding the MOB _ MSHO-REQ message.

Step 503: the service BS can make a selection on the ID list according to the measurement information reported by the MS or the load information reported by the neighbor cell RS or the BS, and sends a HO _ INF-REQ message request to the target BS where the filtered target RS is located to allocate the rapid ranging time to the MS;

one or more filtered target RSs may exist, and the target RSs may not be under the same BS; the serving BS may also implement allocation of a fast ranging time for the MS through a message other than the HO _ INF-REQ.

Step 504: the target BS requests the target RS to allocate a fast ranging time to the MS through a message (e.g., HO _ INF-REQ);

step 505: the target RS determines the resources for distributing the fast ranging to the MS according to the resource scheduling of the target RS, and returns the fast ranging time to the target BS through a message (such as HO _ INF-RSP);

step 506: the target BS tells the serving BS the quick ranging time returned by the target RS through a network layer message HO-RSP;

if the target BS receives the action times fed back by the RS, the target BS can firstly select the received action times and select one action time to feed back to the serving BS. The target BS may also inform the serving BS of multiple action times, which the serving BS decides to select.

Step 507: the service BS makes comprehensive judgment according to the received fast ranging time and selects a piece of fast ranging time information to send to the service RS through the MOB _ BSHO-RSP message;

if multiple target RSs remain after filtering in step 503, the RSs that receive the HO _ INF-REQ message may all return the fast ranging time information, and after the fast ranging time information returns to the serving BS, the serving BS makes a comprehensive judgment according to the received fast ranging time to select a fast ranging time to send to the serving RS through the MOB _ BSHO-RSP message.

Step 508: the serving RS forwards the received MOB _ BSHO-RSP message to the MS.

Step 509: MS sends MOB _ HO-IND to service RS to indicate that the switch is executed;

step 510: the serving RS forwards the received MOB _ HO-IND to the serving BS;

step 511: after the time specified by the Fast ranging time expires, the MS receives the UL MAP of the target RS to obtain Fast ranging IE, and obtains the opportunity to send a ranging request message.

Example four

In this embodiment, if the MS accesses the network through the BS and the target RS to be handed over by the MS is not in the same BS as the RS providing the access service to the MS, the specific handover process is shown in fig. 6 and includes:

step 601: MS initiates a switching request to a service BS through an MOB _ MSHO-REQ message;

Step 602: the service BS can make a selection on the ID list according to the measurement information reported by the MS or the load information reported by the neighbor cell RS or the BS, and sends a HO _ INF-REQ message request to the target BS where the filtered target RS is located to allocate the rapid ranging time to the MS;

Step 603: the target BS requests the target RS to allocate a fast ranging time, namely an action time, to the MS through a message (for example, HO _ INF-REQ);

step 604: the target RS determines the resources for distributing the fast ranging to the MS according to the resource scheduling of the target RS, and returns the fast ranging time to the target BS through a message (such as HO _ INF-RSP);

step 605: the target BS tells the serving BS the quick ranging time returned by the target RS through a network layer message HO-RSP;

Step 606: the service BS makes a comprehensive judgment according to the received fast ranging time and selects a fast ranging time to send to the MS through the MOB _ BSHO-RSP message.

If multiple target RSs remain after filtering in step 602, the RSs that receive the HO _ INF-REQ message may all return fast ranging time information, and after the fast ranging time information returns to the serving BS, the serving BS makes a comprehensive judgment according to the received fast ranging time to select a fast ranging time to send to the MS through the MOB _ BSHO-RSP message.

Step 607: the MS sends MOB _ HO-IND to the serving BS to indicate that the handover has been executed;

step 608: after the time specified by the action time expires, the MS receives the UL MAP of the target RS to obtain Fast ranging IE and obtain the opportunity of sending the ranging request message to send the ranging request message.

In the 802.16j system, the MS can access the network through the RS or the BS. In the case of MS-initiated handover, it should be noted that the MS may handover to the target BS or the target RS. If the target of the handover includes the RS, the interaction of the serving/target BS or the target BS and the target RS is required to acquire the fast ranging time allocated by the target RS for the MS. The process flow is similar to the above embodiment and will not be described here.

The following describes an example of a network-side initiated handover.

EXAMPLE five

In this embodiment, if the MS accesses the network through the RS, and if the target RS to be switched by the MS and the RS providing the access service for the MS are in the same BS, the specific switching process is as shown in fig. 7, and includes the steps of:

step 701: the service/target BS decides to initiate the switching, and sends HO _ INF-REQ message to the target RS to request the target RS to distribute the fast ranging time for the MS; the target RS may be one or more.

Step 702: the target RS determines to distribute fast ranging resources to the MS according to own resource scheduling, and returns fast ranging time information to the service/target BS through the HO _ INF-RSP message;

step 703: if the HO _ INF-REQ message is transmitted to a plurality of target RSs in step 701, then a plurality of target RSs returning the fast ranging time information may be returned, and then the service/target BS may make a comprehensive judgment according to the received fast ranging time information to select one fast ranging time information, and then transmit the fast ranging time information carried by the MOB _ BSHO-REQ message to the service RS; if the HO _ INF-REQ message is transmitted to one target RS in step 701, the serving/target BS transmits the fast ranging time information to the serving RS through the MOB _ BSHO-REQ message.

Step 704: the serving RS forwards the received MOB _ BSHO-REQ message to the MS.

The subsequent flow is similar to steps 307 to 309 in the first embodiment, and will not be described here.

EXAMPLE six

In this embodiment, the MS accesses the network through the BS, and if the target RS that the MS needs to switch is under the BS, the specific switching process includes, as shown in fig. 8:

step 801: the service/target BS decides to initiate the switching, and sends HO _ INF-REQ message to the target RS to request the target RS to distribute the fast ranging time for the MS; the target RS may be one or more.

Step 802: the target RS determines to distribute fast ranging resources to the MS according to own resource scheduling, and returns fast ranging time information to the service/target BS through the HO _ INF-RSP message;

step 803: if HO _ INF-REQ messages are sent to multiple target RSs in step 801, then multiple target RSs that return fast ranging time information may be returned, and then the serving/target BS may make a comprehensive judgment according to the received fast ranging time information to select one fast ranging time information, and then send the fast ranging time information carried by the MOB _ BSHO-RSP message to the MS; if the HO _ INF-REQ message is transmitted to a target RS in step 801, the serving/target BS transmits the fast ranging time information to the MS through the MOB _ BSHO-RSP message.

The subsequent flow is similar to steps 405 to 406 in the first embodiment and will not be described here.

EXAMPLE seven

In this embodiment, the MS accesses the network through the RS, and if the target RS to be switched by the MS and the RS providing the access service for the MS are not in the same BS, the specific switching process includes, as shown in fig. 9:

step 901: the service BS decides to initiate the switching, and sends a HO _ INF-REQ message to a target BS where the target RS is located through a network layer message HO-REQ to request to allocate the fast ranging time for the MS;

the target RS may be one or more.

Step 902: the target BS requests the target RS to allocate a fast ranging time to the MS through a message (e.g., HO _ INF-REQ);

step 903: the target RS determines the resources for distributing the fast ranging to the MS according to the resource scheduling of the target RS, and returns the fast ranging time to the target BS through a message (such as HO _ INF-RSP);

step 904: the target BS tells the serving BS the quick ranging time returned by the target RS through a network layer message HO-RSP;

if the target BS receives the action times fed back by the RS, the target BS can firstly select the received action times and select one action time to feed back to the serving BS. The target BS can also inform the serving BS of multiple action times, and the serving BS judges the selection

Step 905: the service BS makes comprehensive judgment according to the received fast ranging time and selects a piece of fast ranging time information to send to the service RS through an MOB _ BSHO-REQ message;

step 906: the serving RS forwards the received MOB _ BSHO-REQ message to the MS.

If there are multiple target RSs in step 901, the serving BS makes a comprehensive judgment according to the received fast ranging time and selects a fast ranging time to send to the serving RS through the MOB _ BSHO-RSP message, and the selection policy may be various, for example, the selection policy may be used to enable the MS to access the network most quickly, or certainly, may be a suboptimal scheme.

The subsequent flow is similar to steps 509 to 511 in the first embodiment and will not be described here.

Example eight

In this embodiment, the MS accesses the network through the BS, and if the target RS to be switched by the MS and the RS providing the access service for the MS are not in the same BS, the specific switching process includes, as shown in fig. 7:

1001: the service BS decides to initiate the switching, and sends a HO _ INF-REQ message to a target BS where the target RS is located through a network layer message HO-REQ to request to allocate the fast ranging time for the MS;

the target RS may be one or more.

Step 1002: the target BS requests the target RS to allocate a fast ranging time to the MS through a message (e.g., HO _ INF-REQ);

step 1003: the target RS determines the resources for distributing the fast ranging to the MS according to the resource scheduling of the target RS, and returns the fast ranging time to the target BS through a message (such as HO _ INF-RSP);

step 1004: the target BS tells the serving BS the quick ranging time returned by the target RS through a network layer message HO-RSP;

Step 1005: the service BS makes comprehensive judgment according to the received fast ranging time and selects a piece of fast ranging time information to send to the MS through an MOB _ BSHO-RSP message;

if there are multiple target RSs in step 1001, the serving BS makes a comprehensive judgment according to the received fast ranging time to select a fast ranging time to send to the MS through the MOB _ BSHO-RSP message, and the selection policy may be various, for example, to select a scheme that enables the MS to access the network most quickly, or certainly, may be a suboptimal scheme.

The subsequent flow is similar to steps 607 to 608 in the first embodiment and will not be described here.

In the 802.16j system, the MS can access the network through the RS or the BS. In the case of network-side initiated handover, it should be noted that the MS may handover to the target BS or the target RS. If the target of the handover includes the RS, the interaction of the serving/target BS or the target BS and the target RS is required to acquire the fast ranging time allocated by the target RS for the MS. The process flow is similar to the above embodiment and will not be described here.

In the above-described embodiment, the HO _ INF-REQ and the HO _ INF-RSP are newly defined messages. The following provides exemplary definitions of these two messages to enhance understanding of the technical solutions of the embodiments of the present invention. However, it will be understood by those skilled in the art that various modifications and changes may be made to the specific embodiments described below without departing from the spirit and scope of the present invention.

HO _ INF-REQ message definition

The Message Type of the Management Message Type is to be determined, and the Message Type can be a value which is not used by the existing protocol; the HO ID Indicator is used to indicate that the MS is identified in handover using the HO ID or the MAC address.

HO _ INF-RSP message definition

Syntex	Size	Notes
			HO-Rsp_Message_Format(){
Management Message Type＝xx
			Action Time	8
}

The Message Type of the Management Message Type is to be determined, and the Message Type can be a value which is not used by the existing protocol; the Action time, in units of frames, refers to the number of frames that the MS passes by allocating a special transmission opportunity to the MS by Fast ranging IE to the target RS to allow the MS to perform ranging.

The embodiment of the invention discloses a relay station, which is used for switching parameter negotiation of a mobile station, can manage own wireless resources and is connected to a base station in a communicable mode (other relay stations can be arranged between the relay station and the base station, and the relay stations and the base station can be connected in a wireless or wired mode); wherein,

the relay station is used for receiving a switching parameter negotiation request sent by the base station;

the relay station is used for sending a switching parameter negotiation response to the base station.

The embodiment of the invention discloses a wireless access network, which is used for switching parameter negotiation of a mobile station and comprises:

a serving base station; and

wherein the serving base station is configured to receive a handover parameter negotiation response of the target relay station with respect to the mobile station.

The embodiment of the invention also discloses a wireless access network, which is used for switching parameter negotiation of the mobile station, and comprises:

a target relay station which can manage its own radio resources, and

a target base station communicably connected to the target relay station;

wherein the target relay station is configured to return a negotiation response regarding the handover parameters of the mobile station to the target base station.

The embodiment of the invention also discloses another wireless access network, which is used for switching parameter negotiation of a mobile station, and comprises the following steps:

a serving base station; and

a serving relay station communicably connected to the serving base station, an

A target base station communicably connected to the serving base station; and

the serving base station is used for receiving a request sent by the relay station and related to the handover of the mobile station;

a serving base station; and

a target base station communicably connected to the serving base station; and

In summary, in the manner disclosed in the embodiments of the present invention, the target base station obtains the parameter information related to the handover, which is allocated by the target relay station to the mobile station, through the message interaction between the target base station and the target relay station, so that the mobile station can access the target relay station quickly when being handed over to the target relay station, and the handover delay is reduced.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A method for negotiating handover parameters of a mobile station, the method comprising:

sending a switching parameter negotiation request to a target relay station;

2. The method of claim 1, wherein the handover parameter negotiation request carries a mobile station identity.

3. The method of claim 2, wherein the mobile station identification is a MAC address of the mobile station.

4. The method of claim 2, wherein the mobile station identity is a base station assigned handover identity.

5. The method of claim 1, wherein the negotiated parameter is a fast ranging time.

6. The method of claim 1, wherein a fast ranging time parameter is carried in a handover parameter negotiation response.

7. The method of claim 1, further comprising, prior to sending a handover parameter negotiation request to a target relay station:

a handover request sent by a mobile station is received.

8. The method of claim 1, further comprising:

and sending the switching parameter negotiation information to the mobile station.

9. A radio access network for mobile station handover parameter negotiation, the access network comprising:

a serving base station; and

10. A radio access network for mobile station handover parameter negotiation, the access network comprising:

a target relay station which can manage its own radio resources, and

a target base station communicably connected to the target relay station;

11. A radio access network for mobile station handover parameter negotiation, the access network comprising:

a serving base station; and

a serving relay station communicably connected to the serving base station, an

A target base station communicably connected to the serving base station; and

12. A radio access network for mobile station handover parameter negotiation, the access network comprising:

a serving base station; and

a target base station communicably connected to the serving base station; and