CN100505681C - Apparatus and method for avoiding data loss in packet networks - Google Patents

Abstract

Techniques for avoiding data loss and reducing registration overhead in a wireless packet data communication system are disclosed. In one embodiment, a mobile station (170) adds each connection to a connection list (430) following registration with the PCF (130). The mobile station need not reregister a connection included in the connection list when it again enters the PCF's coverage area. In another embodiment, a PDSN (110) maintains a connection table (330), with one or more connections for each mobile station. The PDSN transmits data to the mobile station along one of the connections. In yet another embodiment, a PDSN transmits on an active connection, if one exists. In yet another embodiment, connections in a connection list or connection table are removed when a corresponding inactivity timer (320) expires. Various other embodiments are also presented. Benefits include allowing mobile stations to travel between PCFs without re-registering, which reduces registration overhead and increases system capacity, and avoidance of data loss from network initiated data directed to a mobile station, resulting in timely delivery of the data and reduction of system resources allocated to retransmission of data.

Description

Avoid the Apparatus and method for of the loss of data in the packet networks

Related application

The priority that No. the 60/456th, 025, the U.S. Provisional Patent Application case of this application case opinion application on March 17th, 2003.

Technical field

The present invention relates generally to radio communication, and more specifically relate to and in packet networks, avoid loss of data and reduce registration overhead.

Background technology

Wireless communication system is widely used in to be provided such as various types of communications such as voice-and-datas.These systems can be based on code division multiple access (CDMA), time division multiple access (TDMA) or some other multiple access technology.Cdma system provides some advantage that is better than other type system that comprises the enhanced system ability.

CDMA can be through design to support one or more CDMA standard, such as (1) " TIA/EIA-95-B Mobile Station-Base Station Compatibility Standard forDual-Mode Wideband Spread Spectrum Cellular System " (IS-95 standard); (2) provide and be embodied in by " 3rd Generation Partnership Project 2 " association (3GPP) by name and comprise that document number is 3G TS 25.211,3G TS 25.212, standard (W-CDMA standard) in one group of file of 3G TS 25.213 and 3G TS 25.214, (3) provide and be embodied in standard (IS-2000 standard) in " TR-45.5 Physical LayerStandardfor cdma2000 Spread Spectrum Systems " by " 3rd GenerationPartnership Project 2 " association (3GPP2) by name; (4) some other standard.One exemplary non-cdma system is a gsm system.

Wireless packet data communication system can comprise one or more packet data serving node (PDSN), each packet data serving node is connected to one or more packet coordination functions (PCF), and it is via a physical channel and one or more mobile communications.For the position of keeping travelling carriage in the network and for the ease of by the initial transfer of data of network to described travelling carriage, when travelling carriage entered the overlay area of described PCF, current system may require described travelling carriage in PCF place registration separately.When travelling carriage was advanced between one group of PCF, repeated registration may take place.This registration overhead occupying system resources also reduces the ability of whole system.

When travelling carriage when a PCF moves to another PCF, when a travelling carriage re-registered at a new PCF place, the data that are directed to described travelling carriage from PDSN may be lost.This loss of data can cause transmitting again, and it causes transmission delay and occupying system resources and reduces the whole system ability.Therefore need in wireless packet data communication system, avoid loss of data and reduce registration overhead in this technology.

Summary of the invention

Embodiments disclosed herein have satisfied in wireless packet data communication system avoiding the needs of loss of data and reduction registration overhead.In one embodiment, after the registration of PCF place, travelling carriage adds each connection to one and connects tabulation.When described travelling carriage entered the overlay area of described PCF once more, it need not to re-register the connection that is included in the described connection tabulation.In another embodiment, PDSN keeps a connection table, makes each travelling carriage have one or more connection.Described PDSN is transferred to travelling carriage with data along one of described connection.In another embodiment, if there is a flexible connection, PDSN transmits in described flexible connection so.In another embodiment, when a corresponding inactivity timer expires, remove the connection that connects in tabulation or the connection table.Also there are various other embodiment.Some benefits comprise and allow travelling carriage to advance between PCF and need not to re-register, it has reduced registration overhead and has strengthened system capability, and avoided data from be directed to a travelling carriage by losing the initial data of network, thereby in time transmit described data and minimizing distributes to data system for transmitting resource again.

Description of drawings

Fig. 1 is the general block diagram that many users' a wireless communication system is supported in a displaying;

Fig. 2 is the block diagram of a wireless communication system, and it illustrates that a travelling carriage sets up and keep a plurality of the connection between PDSN and PCF;

Fig. 3 is the block diagram of a PDSN;

Fig. 4 is the block diagram of a travelling carriage;

Fig. 5 is the block diagram such as a radio communication device of a travelling carriage;

Fig. 6 is a flow chart of keeping the method for a plurality of connections in the travelling carriage;

Fig. 7 one handles registration, keeps a plurality of connections and monitors the flow chart of the method for travelling carriage activity in a packet coordination functions (PCF);

Fig. 8 is a flow chart of keeping the method for a plurality of connections among the PCF;

Fig. 9 one uses a plurality of connections to open in a PSDN to begin to the flow chart of the method for the network data transmission of a travelling carriage.

Embodiment

Fig. 1 is the chart of a wireless communication system 100, described wireless communication system 100 can be through design to support one or more wireless standards and/or design (for example, W-CDMA standard, IS-95 standard, cdma2000 standard, HDR standard, 1xEV-DV proposal, GSM standard).In an exemplary embodiment, system 100 supports cdma2000 communication.

For simplicity, system 100 is demonstrated the exemplary configuration that comprises a typical base station components, and it comprises a mobile switching centre (MSC) 160, base station controller (BSC) 140 and base transmission substations (BTS) 150.Two travelling carriages 170 are respectively by one or more BTS150 and base station communication.Described base station and its overlay area often are known as " unit " together.In the IS-95 system, a unit can comprise one or more subregion.In described W-CDMA standard, each subregion of base station and the overlay area of described subregion are called a unit.As used herein, the term base station can exchange with terms access point or Node B and use.The term travelling carriage can corresponding term with known other in terms user equipment (UE), subscriber unit, subscriber station, access terminal, remote terminal or this technology exchanges and uses.The term travelling carriage comprises fixed wireless applications.Travelling carriage is an example of radio communication device.

System according to want construction, whether each travelling carriage 170 can be communicated by letter with (or may more than one a) base station on the forward link at any given time, and can be in the soft handoff and communicate by letter on reverse link with one or more base station according to travelling carriage.Forward link (that is, down link) refers to from the base station transmits to the travelling carriage, and reverse link (that is up link) refers to from travelling carriage and is transferred to the base station.

For clarity, example described herein can assume base stations as the originator of signal, and the supposition travelling carriage is the recipient of those signals (that is the signal on the forward link) and obtains taker.Be understood by those skilled in the art that as described herein, travelling carriage and base station can be through being equipped with the transmission data, and several aspect of the present invention also is applied to those situations.This paper uses word " exemplary " to mean " as example, situation or explanation " specially.Needn't think that any embodiment that this paper is described as " exemplary " is for preferred or be better than other embodiment.

One packet data serving node (PDSN) 110A and an external network communication, in this example, external network is the Internet 120A.In an alternate embodiment, can dispose any network, such as an intranet.PDSN 110A is connected with packet coordination functions (PCF) 130A-B.In this embodiment, in this case, PCF resides in BSC 140A and the 140B.Two BTS 150A and 150B are demonstrated and are connected to BSC 140A, its communicate by letter with travelling carriage 170A in one or more travelling carriage or this example on physical channel (omitting for clarity, the BTS that is connected to BSC 140B).MSC 160 is demonstrated and is connected to BSC 140A and 140B.Well-known in this technology, use MSC to be used to control the various communication activity between base station and the travelling carriage.For example, MSC can be used for promoting the travelling carriage in the network to call out.The principle that is disclosed is applicable to the wireless communication system that comprises MSC.

Yet some wireless communication system does not need MSC, and it may be relatively costly.One example is one the system of data only to be arranged, such as IX-EVDO (being the HDR standard).As shown, in this case, travelling carriage 170A also can communicate by letter with an external network (the Internet 120B) via (as shown) BTS 150C-E, BSC 140C-D, PCF130C-D and PDSN 110B with 170B.Note that these example components are free of attachment to MSC.

Physical layer (that is the Radio Link between travelling carriage 170 and the BTS) can be any kind.In this example, according to cdma2000 standard deployment physical layer.The travelling carriage of each PCF in its overlay area notified its identity.Described identity can be transmitted in any form.In this example, each PCF transmits a unique identifier of being made up of a system identifier (SID), network identifier (NID) and packet zone identifier (PZID).According to convention, can dispose wireless communication system, make SID/NID/PZID combination can be used for any PCF of unique identification.

In the prior art, according to IS-707-A, during variation in detecting the PCF identifier, just need a travelling carriage to carry out packet registration (puppet start (fake origination)).Although the position that this allows to monitor travelling carriage needs distributing system resource to monitor.One travelling carriage can repeatedly be travelled to and fro between between two PCF, especially when the operation of the border of between.In the case, will need a travelling carriage repeatedly to send a puppet starts at every turn.In addition, therein must be during the cycle of location one travelling carriage, the of the prior art existing scheme that reduces this registration overhead with what is lost from network by data often.Can utilize technology described herein to reduce registration overhead, avoid loss of data simultaneously.

When a travelling carriage was registered at a PCF place, described PCF and PDSN set up a relevant connection.In this embodiment, set up the connection that a R-P connects or Radio Access Network (RAN) arrives PDSN.Therefore, when the data from described network arrive a PDSN when being passed to a travelling carriage, described PDSN connects to separately PCF by R-P and delivers data, and crosses over physical layer to travelling carriage.Technology disclosed herein allows each travelling carriage to keep one in the registration at visit PCF place or the tabulation of connection.When travelling carriage ran into the PCF that is kept in its connection tabulation, it need not to re-register, thereby has reduced registration overhead.PDSN also can support to be connected with a plurality of of single mobile station by a plurality of corresponding PCF.Hereinafter will be described in further detail.

When data arrive PDSN when being passed to a travelling carriage, technology disclosed herein can be used for selecting a plurality of connections one of them or locate a travelling carriage in addition with Data transmission.One travelling carriage can be in from a PCF and switch to the process of another PCF.In the prior art, the PDSN that directs the data to the travelling carriage on the previous PCF incites somebody to action not buffered data.When new PCF and described PDSN set up new R-P and be connected, formerly connect the data that go up transmission and lose.In the embodiment of the following stated, when making this judgement, utilize a buffer to transmit data to avoid loss of data.

Fig. 2 describes an embodiment of wireless communication system 100, for purposes of illustration, shows a subclass of some assemblies.In this example, PCF-1, PCF-2 and PCF-3 (130A-C) notify PZID1,2 and 3 respectively, and can communicate by letter with PDSN-A 110A.PCF-4 and PCF-5 (130D-E) notify PZID4 and 5 respectively, and communicate by letter with PDSN-B 110B.

When travelling carriage 170 arrived the overlay area of PCF-1, it detected PZID 1.Travelling carriage is carried out packet zone registration at the PCF-1 place.In this example, login mechanism is as described in the IS-707-A-2.12.Travelling carriage adds PCF-1 in the PCF tabulation of its visit to.Visit PCF tabulates and is an example of a connection table that hereinafter will further describe.PCF-1 sets up one with PDSN-A and is connected.In this example, the described R-P that is connected to connects.Then travelling carriage enters resting state, and moves to the overlay area of PCF-2 at last.Travelling carriage detects PZID 2 and adds in its PCF that visits tabulation in the registration of PCF-2 place and with PCF-2.PCF-2 is that described travelling carriage is set up one second with PDSN-A and is connected.Have two now between PDSN-A and travelling carriage 170 and be connected, one is passed through PCF-2 by PCF-1 and another.

Travelling carriage 170 is movable on PCF-2 now, and PCF-2 sends the movable control messages that is connected to that is indicated to PCF-2 to PDSN-A.During at this moment, PDSN-A sends data service (data traffic) by flexibly connecting via PCF-2 to travelling carriage 170.As shown, travelling carriage 170 also can enter the overlay area of PCF-3, in PCF-3 place registration, and is connected setting up a corresponding R-P between PDSN-A and the PCF-3 for described travelling carriage.Have only one to be connected to movablely, other connection will be in halted state at every turn.When a connection was designated as activity, PDSN can use a described connection and a mobile communications.

Supposition now: travelling carriage has entered resting state, although and between travelling carriage and PDSN-A, have three and be connected, neither one is activity in three connections.Travelling carriage can pass in and out in any one overlay area in these three PCF, and does not need to carry out registration, thereby has avoided the overhead that is associated with described registration.Yet because have a plurality of being connected of described travelling carriage that are used between PDSN-A and PCFs 1-3, so arrive PDSN-A when transferring to travelling carriage 170 when a packet, how PDSN-A has the selection to the travelling carriage transmission.Because this moment none be connected to movable, so PDSN does not know in the current overlay area that is in which PCF of travelling carriage.Locating of described travelling carriage is chosen as to all existing connections and sends packet simultaneously.This can cause at three and call out described travelling carriage in each of PCF overlay area separately.This is chosen in the business of introducing in all three R-P connections, and also uses the calling channel capacity in all three zones.Yet,, can locate described travelling carriage soon so if travelling carriage still rests in three overlay areas any one.

Use less average call channel capacity and be chosen as trial and on an existing subclass that connects, send packet at another of the positioning mobile station that needs less average overhead in the R-P connection.For example, can select a single connection, and on selected the connection, attempt the Data transmission bag.In one embodiment, at first select nearest flexible connection.If in scheduled time slot, on connecting, there is not response, connects second so and carry out the trial second time from travelling carriage.In one embodiment, can select the second nearest flexible connection.Then attempt existing connection continuously, up to positioning mobile station, or tabulation is used up.The order of preference that connects also can be followed any other method, for example, selects to can be at random.Also can utilize the mixing of these two kinds of methods, the subclass that attempt to connect simultaneously wherein, and if travelling carriage in selection subsets, attempt not being positioned between transmission period, attempt other subclass so.

Sometimes may wish to delete the number of connection of being set up.For example, if travelling carriage 170 is not visited the overlay area of PCF-1 in the some time, the dismountable R-P to PCF-1 of PDSN-A connects so.In one embodiment, can in travelling carriage and PDSN, keep inactivity timer.When travelling carriage became inertia on PCF separately, the PDSN in the travelling carriage can begin it and be used for a timer separately that connects.In one example, the 2nd PCF place registration and/or with the 2nd PCF set up a Traffic Channel can indicate with a PCF between be connected no longer for movable.The communication of any other type among the PCF between the travelling carriage can be used for sending out one and flexibly connects signal.When the inactivity timer of a specific connection expired, travelling carriage can remove connection separately from its connection table.In this example, travelling carriage removes PCF separately from its PCF that visits tabulation.PDSN also can remove connection separately from its connection table, and closes and the R-P session of PCF separately.Hereinafter be described in further detail the exemplary technique that deletion connects tabulation.

A plurality of PDSN in one network can cooperate, and therefore can share the link information of a travelling carriage, or can not cooperate.In the embodiment of Fig. 2, PDSN-B 110B does not cooperate with PDSN-A 110A.When travelling carriage 170 is set up one or more the connection with PCF-4 or PCF-5, and when PDSN-B sets up separately R-P and is connected, indicated as dotted line, may wish travelling carriage removing and being connected that PDSN-A is associated.In this example, the PCF that is associated with a PDSN can not communicate by letter with another PDSN.Therefore, when a travelling carriage enters the overlay area of the 2nd PDSN, need not to be maintained to the connection of a PDSN.Can utilize the multiple technology of judging when travelling carriage enters the overlay area of new PDSN of being used to, hereinafter in detail the example will be described in detail.One travelling carriage decidable is removed the needs of its connection table, maybe can send out the signal of the message of removing the connection table from PCF.For example, can be used for sending out the signal of removing its PCF that visits tabulation such as existing message to travelling carriage at the Service Option Control Message described in the 2.2.6 of the IS-707-A-2.12 part.

Fig. 3 is the block diagram of the embodiment of PDSN 110.For discuss clear for the purpose of, a subclass of showing the assembly of described PDSN.Fig. 3 shows that processor 310 is connected table 330, a plurality of timer 320 and a buffer 340 and is connected with one.Processor 310 is stored in the link information of a plurality of connections of each travelling carriage in the connection table 330.Connection table 330 also can be kept at which connection (if there is) of a specific travelling carriage is movable indication.Hereinafter be described in further detail the exemplary technique of using connection table 330.

Whether processor 310 can use timer 320 to judge and a connection be removed from connection table 330.Although be shown as discrete block, can in processor 310, carry out timer 320.Hereinafter will be described in further detail the exemplary technique of using timer 320.

The network data service that designated confession is passed to travelling carriage can be delivered to buffer 340 to store.This can be used for allowing the free location of PDSN to maintain travelling carriage in one of described connection in the connection table 330.Data from buffer 340 are transferred to a travelling carriage along one of R-P connection via PCF.Also can be included in (not shown) among the PDSN 110 with various other assemblies that network is communicated by letter with PCF.

Fig. 4 is the block diagram of an embodiment of a travelling carriage 170.For discuss clear for the purpose of, a subclass of showing the travelling carriage assembly.Processor 550 is carried out registration and is kept and being connected of described PCF130 at one or more PCF130 place.The tabulation of the PCF that visits can be stored in log-on message and be connected in the table 430.Timer 420 can be used for keeping connecting tabulates.When expiring, corresponding timer can from connection table 430, remove connecting.Hereinafter will be described in further detail the exemplary technique of keeping a plurality of connections.

Fig. 5 is a block diagram such as the radio communication device of travelling carriage 170.The block of describing in this one exemplary embodiment usually will be for being included in a subclass of the assembly in the travelling carriage 170.The those skilled in the art will be easy to make the embodiment shown in Fig. 5 to be applicable in any amount of travelling carriage configuration.With clear, described assembly is applicable among PDSN or the PCF as the those skilled in the art.One radio communication device can comprise one or more integrated circuit (IC).For example, a receiver can comprise one or more application-specific integrated circuit together with a Base-Band Processing IC.Those skilled in the art will realize that hereinafter illustrated various blocks can be configured in any combination of hardware (comprising application-specific integrated circuit and/or general processor) and/or software.

Received signal and it is delivered to receiver 520 on antenna 510.Receiver 520 is carried out according to one or more wireless system standards (such as standard listed above) and is handled.Receiver 520 is carried out various processing, such as radio frequency (RF) to the conversion of base band, amplification, analog-to-digital conversion, filtering etc.The known various technology that are useful on reception in this technology.Receiver 520 can be incorporated among the radio frequency IC (RFIC) (details is not shown) with the one or more assembly of radio communication device.

According to one or more communication standard in demodulator 525 demodulation from the signal of receiver 520.In an one exemplary embodiment, utilize the demodulator of an energy demodulation cdma2000 signal.In alternate embodiment, can support alternate standard, and embodiment can support or can not support a plurality of communication formats.Demodulator 530 can be carried out needed various other functions of form of RAKE reception, equilibrium, combination, release of an interleave, decoding and received signal.Known in this technology have various demodulation techniques.Data and control channel are to receive the also example of the channel of demodulation in receiver 520 and demodulator 525.

Message decoder 530 receiving demodulation data are also extracted signal and the message that is directed to travelling carriage 170 on the forward link.530 pairs of message decoder be used to set up, keep and the dismounting system on various message of calling out (comprising voice or data session) decode.Message can comprise PCF identifier, beep-page message, other message (this paper has described the example in detail) and be used for any control channel message of demodulation forward link.In this technology known have various other type of message and can be defined in the various communication standards of being supported.Message is passed to processor 550 to be used for processing subsequently.Although only show a discrete block in order to discuss for the purpose of clear, some of message decoder 530 or all functions can be carried out in processor 550.Perhaps, demodulator 525 can and directly send it to processor 550 (single-bit messages or the order of power control up/down such as an ACK/NAK are example) to some information decoding.

Also utilize searcher 540 to receive signal from receiver 520.Searcher 540 can be carried out search and can carry out off-line search (details is not shown) to the data from sample RAM the reception sample that enters.Searcher 540 is carried out search according to the search parameter that is provided by processor 550.Use the various technology of searcher 540 startup all kinds search well-known in this technology.

Signal is via antenna 510 transmission.The signal that is transmitted formats in reflector 570 according to one or more wireless system standards (above listing the example).The example that can be contained in the assembly in the reflector 570 is amplifier, filter, digital-to-analogue (D/A) transducer, radio frequency (RF) transducer etc.The data that are provided for transmitting to reflector 570 by modulator 565.Data and control channel can format to be used for transmission according to multiple form.The example that can incorporate the assembly in the modulator 565 into comprises various types of encoders, interleaver, frequency multiplier and modulator.

As described herein, message generator 560 can be used for preparing various types of message.Various types of control messages can produce in a travelling carriage 170 being used for to be transmitted on reverse link.

In demodulator 525, receive and demodulated data can be delivered to processor 550 being used for voice or data communication, and can be delivered to various other assemblies.Similarly, the data that are used to transmit can be directed to modulator 565 and reflector 570 from processor 550.For example, various data-applications can be present on the processor 550, or are present in (not shown) on another processor that is included in the radio communication device 170.Radio communication device 170 can be included in such as a link of an external device (ED) of laptop computer (not shown) or with an external device (ED) and be combined into one.

Processor 550 can be a general purpose microprocessor, a digital signal processor (DSP) or an application specific processor.Processor 550 can be carried out some or all functions and needed any other processing of radio communication device of receiver 520, demodulator 525, message decoder 530, searcher 540, message generator 560, modulator 565 or reflector 570.Processor 550 can be used to carry out the timer function of describing about timer block 420 such as more than those.Processor 550 can be connected with specialized hardware to assist these tasks (details is not shown).Data or voice application can be outside, and the laptop computer that connects such as the outside or to the connection of a network can (not shown) operation on the additional processor radio communication device 170 in, or can move on one's body 550 of processors.Processor 550 is connected with memory 555, and described memory 555 can be used for storing data and instruction, to carry out various program as herein described and method.As mentioned above, memory 555 can be used for storage and connects a tabulation or a connection table (such as connecting table 430).Those skilled in the art will realize that memory 555 can be made up of various types of one or more memory assemblies, it can be all or partly in the embedded processor 550.

Fig. 6 is a flow chart of keeping the method 600 of a plurality of connections in a travelling carriage.Program beginning in decision block 605.If travelling carriage detects new PCF, be forwarded to decision block 610 so.If the PCF that is detected has been stored in the connection table, be forwarded to decision block 635 so.Do not need to carry out registration.Otherwise, be forwarded to step 615 and register at detection PCF place.One registration message can comprise the information of the PDSN that can be used for discerning previous connection.For example, can transmit a PDSN identifier.Perhaps, PCF can contact PDSN to judge whether old PCF is connected to described PDSN.Perhaps, can transmit a PCF identifier, and the PCF that is associated with PDSN is for known to the PCF, thereby allows described PCF to judge whether travelling carriage before had been connected to one and has substituted PDSN (hereinafter being described in further detail the use of this information).Simultaneously, the PCF that is detected can be stored in the connection table, as shown in step 620.In one embodiment, connection table tabulate by a packet zone (or visit PCF tabulation).Any amount of parameter can be stored together with PCF, when visiting PCF once more with convenient travelling carriage, and the overhead costs that institute's canned data allows the travelling carriage omitted registration and avoids being correlated with.

In decision block 625, if sending one to travelling carriage, PCF removes table message, be forwarded to step 630 so and remove described connection table.This is characterized as selectable, and can use this feature when a travelling carriage is advanced between the PDSN that does not cooperate.When a travelling carriage with set up when communicating by letter with PDSN that previous PDSN does not cooperate, keeping a plurality of connections (this paper discusses its technology) may be not suitable for.In the case, can instruct travelling carriage to remove the connection table that is connected that is associated with previous PDSN.In the embodiment shown in Fig. 6, the travelling carriage response connects table from the message erasing of PCF.In an alternate embodiment, travelling carriage can detect and be converted to a new PDSN.For example, if a point-to-point protocol (PPP) takes place synchronously again after registration, travelling carriage can detect a different PDSN IP address so, and the removing connection table that therefore will respond.Be used to detect and be converted to any other mechanism that does not cooperate PDSN and can be used for removing connection table in the scope of the invention.If do not receive removing table message (or detect other method of the new PDSN that do not cooperate), or the connection table removes, is forwarded to decision block 635 so.In the alternate embodiment of wherein a plurality of PDSN cooperations, cross over PDSN and can keep a plurality of connections, and need not to remove the connection table.

Illustrated another feature is the connection that deletion is kept among the embodiment that Fig. 6 describes.In this example, inactive timer is used for each connection.When one connects timer expiration, remove described connection from the connection table.In one embodiment, based on inactivity, do not remove last connection to guarantee to stay at least one connection.In an alternate embodiment, based on removable any or all connection of inactivity.In another alternate embodiment, the full time of a longer-term can be used for removing last connection.In PDSN, keep parallel timer, hereinafter will be described in further detail.The PDSN time expiration can rebulid a connection that can expire to guarantee travelling carriage really greater than the time expiration that is used for travelling carriage in described PDSN.In this technology, become known for deleting various other technology of connection table and its within the scope of the invention.

In decision block 635,, be forwarded to the inactivity timer that step 640 and replacement are associated with movable PCF so if between travelling carriage and PCF, have active communications.Under the situation of no any active communications, it is possible advancing between the PCF of travelling carriage in being contained in the connection table.In fact, as shown in Figure 6 in certain embodiments, an advantage starts and associated overhead for not needing a puppet.Should not reset separately inactivity timer, unless PCF and therefore PDSN know that also travelling carriage visits the PCF overlay area again.The active communications of any kind can be used for a resetting inactivity timer and indicate PCF and/or the PDSN travelling carriage has been visited described PCF.In an alternate embodiment, can stipulate that a resource efficient message is used to one to connect the inactivity timer of resetting.This message can be used the overhead that lacks than an accreditation process.For example, as visit one new PCF in decision block 605 and when judging that described connection has been present in the connection table in decision block 610, this message can be used for producing activity in the decision block 635 with the inactivity timer separately among pressure replacement travelling carriage and the PDSN.

In 645 steps, the various inactivity timers of setting up for connection in the renewable connection table are to take into account elapsed time.The various technology of keeping inactivity timer are well-known in this technology.In decision block 650,, be forwarded to 655 steps so and remove connection corresponding to the timer that is expired if one or more inactivity timer expires.From decision block 650 or step 655, advance to backward decision block 605 with begin this circulation next repeatedly.

Fig. 7 is for handling the flow chart of registering, keeping a plurality of connections and monitor the method 700 of travelling carriage activity in a packet coordination functions (PCF).The PCF that is used for manner of execution 700 can operate with the countless travelling carriages that other is connected the method for keeping with being configured to carry out said method 600.

Program beginning in decision block 710, its circulation turn back to himself and receive from the transmission of a travelling carriage and be forwarded to decision block 720 up to PCF.In decision block 720,, be forwarded to step 740 so and be connected to set up one with PDSN that PCF is associated if be transmitted as a registration.In this embodiment, setting up a R-P connects.Wherein utilize among the embodiment of the PDSN do not cooperate one, accreditation process can provide the method (above providing the example) of identity of judging that travelling carriage communicates with and keeping the previous PDSN of connection for it.In decision block 750,, can continue to keep any connection of before being kept so if current PDSN (being the PDSN that PCF is connected to) is identical with previous PDSN.Be forwarded to decision block 770.If inequality, be forwarded to step 760 so and send a removing table message should be removed travelling carriage with indication connection table to travelling carriage.Then be forwarded to decision block 770.

In decision block 720,, be forwarded to step 730 so and send out the signal of travelling carriage for activity to PDSN if the transmission that is received is not a registration.The mobile communications of any kind can be used for indicative of active.This step is optionally, and can be used for deleting connection table (described at travelling carriage as mentioned), and hereinafter is described in further detail at PDSN.Be forwarded to decision block 770.

In decision block 770,, just keep described program as long as travelling carriage is movable.When travelling carriage when no longer being movable, be forwarded to 780 steps, and to send out travelling carriage to PDSN be inactive signal.Then turn back to decision block 710 to wait for next travelling carriage transmission.Those skilled in the art will realize that this program can be used for being supported in a plurality of travelling carriages of communicating by letter with PCF under movable or the inactive variable condition.

Fig. 8 is a flow chart of keeping the method 800 of a plurality of connections among the PDSN.The PDSN that is used for manner of execution 800 can operate with the countless travelling carriages that other is connected the method for keeping with being configured to said method 600.The PDSN that is used for manner of execution 800 also can operate with the PCF that is configured to carry out said method 700 and countless other methods.

Program beginning in decision block 805.When setting up new a connection, be forwarded to step 810 with PCF.The new connection is added to a connection table, and is associated corresponding to the described travelling carriage that is connected or by the travelling carriage index corresponding to described connection.In an exemplary embodiment, setting up a R-P connects.In step 815, will newly connect and be set at flexible connection.In this embodiment, maximum at any one time connections can be activity.Enter resting state if connect next flexible connection of situation that does not become activity at another, a travelling carriage can not have flexible connection so.The one or more connection of keeping a travelling carriage at a connection table with and which to connect (if having) be the indication of activity.Specify one to be connected to movablely and available under multiple situation, hereinafter will be described in further detail the exemplary technique of its use.Then program turns back to decision block 805 to carry out next circulation repeatedly.In decision block 805, newly do not connect if do not set up one, be forwarded to decision block 820 so.

In decision block 820,, be forwarded to step 825 so if PDSN receives a travelling carriage inertia message.PDSN makes the described inertia that is connected that is associated with described message.In 830 steps, set a inactivity timer corresponding to described connection.About as described in Fig. 6, this new active time can use in a similar manner in a travelling carriage and can be used in combination with an inactivity timer as above.Can be in the connection table, each that is associated with one of a plurality of travelling carriages keeps an inactivity timer for being connected.The various technology that are used for keeping a plurality of timers are well-known in this technology.For example, can in hardware, use discrete timer.In alternate embodiment, can be each inactivity timer and store the time at the beginning.Can deduct the time started from the shared timer that the current time is provided, and the result be compared with the time expiration of regulation judge whether one or more timer expires.The those skilled in the art will be easy to adapt to various other timing technologies.Then program turns back to decision block 805 to carry out next circulation repeatedly.If in decision block 820, do not receive the inactive message of a travelling carriage, be forwarded to decision block 835 so.

In decision block 835,, be forwarded to 840 steps so and be the flexible connection of travelling carriage separately with the described linkage flag that will be associated with described message if receive the message of a travelling carriage activity.In 845 steps, can reset is used for the corresponding inactivity timer of described connection.If determining block 835 not receive the message of a travelling carriage activity, be forwarded to decision block 850 so.In decision block 850,, be forwarded to step 855 so and close corresponding connection if a timer expires.Can remove connection from the connection table.As mentioned above, a travelling carriage can be kept an inactivity timer corresponding to each connection of keeping simultaneously.Can select the time expiration of travelling carriage and PDSN before travelling carriage, can not remove and close corresponding the connection respectively to guarantee PDSN.Therefore, travelling carriage has the chance of the connection of rebuliding in the time of will guaranteeing in a single day to have closed or be about to close connection at the PDSN place.When PDSN removes a connection, guarantee that the known road of travelling carriage will remove described connection.This feature helps avoiding loss of data.Note that in one embodiment, when the single connection of a travelling carriage remains in the connection table, will not delete described connection based on inactivity.Therefore, keep at least one connection up to clearly removing described connection for each travelling carriage via some other mechanism.In an alternate embodiment, can remove any or all connection based on inactivity.In another alternate embodiment, may need a time expiration of growing to remove last connection.The those skilled in the art will be easy to adapt to these and other technology in the scope of the invention.As previously mentioned, the connection during selectively the deletion connection is shown.

Fig. 9 is for using the flow chart of the initial method 900 to a travelling carriage transmitting network data of a plurality of connections among the PDSN.Program beginning in decision block 910, wherein it keeps up to there being network data to be transferred to a travelling carriage from PDSN.In step 920, when being found to effective connection of travelling carriage, buffering transmission data is to prevent loss of data.In decision block 930,, be forwarded to step 960 so and begin and on flexibly connecting, data are transferred to travelling carriage from buffer if one flexibly connect availablely.If only keep a single connection, even so described connection inertia can think that also it is flexible connection, as mentioned above for travelling carriage.Yet, use therein among some embodiment of the PDSN do not cooperate, have scope that the travelling carriage that inertia connects (and if do not keep its last flexible connection in addition may be removed because of inactivity) may shift out described PDSN and may be another PDSN place registration or communicating by letter of termination and described PDSN in addition.Travelling carriage can not its Data transmission of subtend trial respond.Because the higher level Failure Of Protocol, perhaps reaching wherein, PDSN receives data to be transferred to the not this situation of the travelling carriage in its overlay area.Known in this technology have the various particular routine of handling this mistake and can use in the scope of the present invention.In one embodiment, the flexible connection (if there is) of a travelling carriage maintains in the connection table.

In decision block 930,, advance to step 940 so and come positioning mobile station if there is not available flexible connection.Be used for a travelling carriage when keeping a plurality of connections, and during the equal inertia of described connection, travelling carriage can be freely moves between the PCF of PDSN and need not registration being connected to, and in current any one zone of serving that is in a plurality of PCF.Can use the technology of multiple positioning mobile station.

In an alternate embodiment, in a plurality of connections of PDSN in the connection table packet is directed to travelling carriage.Then will mobile paging station corresponding to each PCF of each connection in a plurality of connections.If receive paging, travelling carriage can be made response in one of described connection so.For positioning mobile station the most apace, can increase the paging channel utilization rate and be that cost uses all to open but inactive connection comes positioning mobile station.Can use any subclass of keeping connection equally.

In another alternate embodiment, each of a plurality of connections that can keep by connected reference is located a travelling carriage.To distribute the regular hour amount in a paging that connects and between from the response (if there is) of travelling carriage.If the efflux that is distributed and do not have response and occur will be tested next connection so.In one embodiment, at first utilize nearest flexible connection, then next nearest flexible connection or the like is up to attempting in all connections.In another embodiment, can select the connection that to attempt at random.Also can utilize the combination of these technology.

In 950 steps, the connection that is positioned with travelling carriage on it is set at flexible connection, and therefore in 960 steps, in described connection, the transfer of data in the buffer is arrived described travelling carriage.Then program turns back to decision block 910.

When positioning mobile station,, can avoid loss of data and be used for transmitting again or the associated overhead of other wrong control protocol by buffered data in PDSN.Simultaneously, a travelling carriage is freely being advanced in the All Ranges of PDSN service under the situation of repeated registration not, thereby reduces associated overhead and preserved system capability.

It should be noted that and in above-mentioned all embodiment, can exchange method step without departing from the present invention.Disclosed herein being described in most cases relates to signal, parameter and the program that is associated with the cdma2000 standard, but scope of the present invention is not limited.The those skilled in the art will be easy to the principle of this paper is applied to various other communication systems.The those skilled in the art will know these and other modification of the present invention.

Be understood by those skilled in the art that and use any multiple different skill and technique and technology to come expression information and signal.For example, spreading all over data, instruction, order, information, signal, bit, symbol and the chip that above description can reference can be represented by voltage, electric current, electromagnetic wave, magnetic field or particle, light field or particle or its any combination.

The technical staff will further understand the described various illustrative logical blocks of embodiment, module, circuit and the algorithm steps that disclose in conjunction with this paper can be embodied as electronic hardware, computer software or both combinations.For the described interchangeability of clear explanation hardware and software, above according to its functional various Illustrative components, block, module, circuit and step described usually.This is functional still to be that software implements to depend on application-specific and the design constraint that puts on whole system as hardware.The mode that the technical staff can change is implemented described functional at each application-specific, but described enforcement determines should not be construed as to cause departing from the scope of the present invention.

Various illustrative logical blocks, module and the circuit of describing in conjunction with embodiments disclosed herein can following each thing be implemented or carried out: general processor, digital signal processor (DSP), Application Specific Integrated Circuit (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components or its through design to carry out any combination of function described herein.General processor can be microprocessor, but in alternate embodiment, described processor can be any conventional processors, controller, microcontroller or state machine.Also processor can be embodied as the combination of calculation element, for example, DSP and combination, the plurality of microprocessors of microprocessor, one or more microprocessors that combine the DSP core or any other such configuration.

Can directly in hardware, the software module of carrying out by processor or both combinations, embody in conjunction with the method for embodiments disclosed herein description or the step of algorithm.Software module can reside in the medium of known any other form in RAM memory, flash memory, ROM memory, eprom memory, eeprom memory, register, hard disk, removable disk, CD-ROM or this technology.Exemplary storage medium is couple to processor, makes described processor and information can be write the described medium from read information.In alternate embodiment, medium can be integral with processor.Processor and medium can reside among the ASIC.Described ASIC can reside in the user terminal.In alternate embodiment, processor and medium can be used as discrete component and reside in the user terminal.

Provide above-mentioned description to be intended to make any technical staff in affiliated field can implement or use the present invention to announcement embodiment.The those skilled in the art can easily understand the various modifications to these embodiment, and under the situation that does not break away from the spirit or scope of the present invention, the General Principle that this paper defined can be applied to other embodiment.Therefore, the present invention is not intended to be limited to embodiment illustrated herein, but conforms to the corresponding to broad range of novel feature with principle disclosed herein.

Claims (9)

1. equipment movably, it comprises:

One connects table, and it is used to store one or more connection identifier (CIDs, and described connection identifier (CID identifies a packet coordination functions;

One receiver, it is used to receive a connection identifier (CID;

One processor, it is used for not transmitting the connection identifier (CID of described reception to store to described connection table when a connection identifier (CID that is received is contained in described connection table; With

One reflector, its connection identifier (CID that is used for responding described reception when a connection identifier (CID that is received is not contained in described connection table sends a registration to described packet coordination functions.

2. equipment according to claim 1, it further comprises a timer, and the expiration that wherein said processor responds described timer removes a connection from described connection table.

3. equipment according to claim 2, wherein said processor respond described reflector with described connection that it is associated on the transmission described timer of resetting.

4. equipment according to claim 2, wherein when receiving one during corresponding to the connection of a packet data serving node (PDSN), described processor is removed described connection table, and described packet data serving node (PDSN) is different from the PDSN corresponding to a previously stored connection.

5. equipment according to claim 2, wherein when described receiver received a removing table message, described processor was removed described connection table.

6. method of registering and keeping connection, it comprises:

Receive a connection identifier (CID, described connection identifier (CID identifies a packet coordination functions;

Response one connection that is received is not included in the connection table and registers a connection to described packet coordination functions; And

When described connection is not included in the described connection table, the connection identifier (CID of described reception is stored in the described connection table.

7. method according to claim 6, its further comprise the response one be associated timer expiration and from described connection table, remove a connection.

8. method according to claim 6, it further comprises:

Receive one and remove table message; And

Respond described removing table message and remove described connection table.

9. equipment movably, it comprises:

Receiving member, it is used to receive a connection identifier (CID, and described connection identifier (CID identifies a packet coordination functions;

Means of storage, it is used for when described connection is not contained in described connection table the connection identifier (CID of described reception is stored in the connection table; With

The registration member, it is used for responding a connection that receives and is not contained in described connection table and registers a connection to described packet coordination functions.

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