CN1169806A - Package radio system, and terminal equipment for a package radio system - Google Patents
Package radio system, and terminal equipment for a package radio system Download PDFInfo
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- CN1169806A CN1169806A CN96191404A CN96191404A CN1169806A CN 1169806 A CN1169806 A CN 1169806A CN 96191404 A CN96191404 A CN 96191404A CN 96191404 A CN96191404 A CN 96191404A CN 1169806 A CN1169806 A CN 1169806A
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Abstract
A packet radio system encapsulates data packets of external data networks by a point-to-point protocol PPP ( 4A, 4B), and passes them through one or more sub-networks to a point which supports the protocol of the encapsulated data packet. In addition, a special radio link protocol of the packet radio network is required on the radio interface between a mobile data terminal equipment and a support node. PPP packets are encapsulated in data packets of said radio link protocol. The disadvantage of the arrangement is that the data packets of both the PPP protocol and the radio link protocol contain protocol-specific control fields, which reduces the transmission capacity of user information. Therefore, a PPP packet is compressed ( 4C) before the encapsulation ( 4D) by removing therefrom the unnecessary control fields. After having been transferred over the radio interface, the PPP packet is decompressed into its original format ( 4F, 4G).
Description
The present invention relates to a kind of packet radio network, this system comprises a digital mobile communication network; At least one packet radio support node is connected to this mobile radio communication and one or more other packet radio support node, and/or an access point of external packet data net is provided; For the packet data transmission of being undertaken by wave point provides a grouped data terminal equipment of access point, the employed common communication protocol of application that described access point support is associated with this terminal equipment.
Because people require to free from the constraint of fixed telephone terminal, move freely and the property connected that do not hinder them, so mobile communication system is arisen at the historic moment.Along with the increase of the use of different pieces of information transport service in the office, in mobile communication system, also introduced the different pieces of information business.No matter portable computer moves to the user and where can handle effectively data.Then offer effective Access Network that user's mobile data transmits as for mobile radio communication, for example be provided to an Access Network of the access of real data network.For this reason, designed different new data service for existing with mobile radio communication in the future.Digital mobile communication system, for example pan-European mobile communication system GSM (global system for mobile communications), transmission is supported especially remarkably to mobile data.
General packet radio service gprs is in the gsm system one new service, and it is one of the project of the standardization effort of ETS1 (the European Telecommunication Standard committee) GSM stage 2+.GPRS running environment is made up of one or more subnets coverage, and these subnet coverages are by a GPRS backbone network interconnection.Subnet comprises a plurality of packet data serving nodes, be referred to as GPRS Support Node (or agency) in this article, each packet radio service node is connected to a GSM mobile radio communication in the following manner, be that it can pass through several base stations, promptly honeycomb provides packet data service to mobile digital terminal equipment.Middle mobile radio communication provides circuit switching or packet switched data transmission between support node and moving data terminal equipment.Different sub-network is connected to an external data network, for example a public packet switched data net PSPDN.Like this, the GPRS service produces packet data transmission between moving data terminal equipment and external data network, and a GSM net serves as Access Network.An aspect of GPRS service network is that it almost is independent of the work of GSM net.One of GPRS service requirement is that it must be worked with dissimilar outside PSPDN, for example with Inter-net or X.25 net work.In other words, no matter the user wishes to arrive which kind of data network by the GSM network registry, perhaps use which kind of agreement in data terminal equipment, GPRS service and GSM network all should be served all users.GSM network and the GPRS service that this means has to support and handles different network addressings and data packet format, and gets ready for the data network protocol of new (in the future).
A kind of packet radio network reliable and the efficient data transmission that provides is provided, and it supports multiple outer data network and agreement, and supports New Deal as far as possible neatly, and it is minimum that it is changed.
This purpose realizes by the packet radio network of describing in foreword, according to the present invention, it is characterized in that
In the internal transmission of packet radio network, use a kind of point-to-point protocol that is independent of described common communication protocol, packet according to described point-to-point protocol comprises the used control domain of this agreement, the identification field of the used agreement of marking terminal equipment, and data field, like this, according to the packet of this puppy parc in the internal transmission of this packet radio network, according to point-to-point protocol encapsulation (encapsulate) in the data field of packet
On wave point, between this grouped data terminal equipment and described at least one packet radio support node, use a kind of special radio link protocol, described radio link protocol support is a bit transmitted control to multiple spot addressing and packet, packet according to described radio link protocol comprises the used control domain of this agreement and a data field
By therefrom leaving out at least one control domain, this grouped data terminal equipment and described at least one support node compression are transmitted by this wave point, according to the packet of this point-to-point protocol, and in according to the data field of the packet of this radio link protocol remaining territory of encapsulation
Before this packet is by commentaries on classics before further,, this grouped data terminal equipment and described at least one support node decompress(ion) are received, by this wave point according to the compressed data packet of this point-to-point protocol by being added in the territory of leaving out in the compression.
The invention still further relates to a kind of terminal equipment of packet radio network, described terminal equipment provides an access point for the packet data transmission of being undertaken by wave point, the common communication protocol that the application that described access point support is associated with this terminal equipment is adopted.This terminal equipment is characterised in that, this terminal equipment uses a kind of point-to-point protocol that is independent of described common communication protocol in the internal transmission of packet radio network, packet according to described point-to-point protocol comprises the used control domain of this agreement, identify the identification field of the used agreement of this terminal equipment, and data field
Used a kind of special radio link protocol during this terminal equipment uses in the transmission of being undertaken by wave point and transmits between this packet radio network node, described agreement support is a bit transmitted control to multiple spot addressing and packet, packet according to described radio link protocol comprises the used control domain of this agreement and a data field
Make terminal equipment in according to the data field of the packet of described point-to-point protocol encapsulation according to the transmission packet of this puppy parc,
By therefrom leaving out at least one control domain, the compression of this terminal equipment is transmitted by this wave point, according to the packet of this point-to-point protocol, and in according to the packet of this radio link protocol encapsulation remaining territory,
By being added in the territory of leaving out in the compression, this terminal equipment decompress(ion) is received by this wave point, according to the compressed data packet of this point-to-point protocol,
Make this terminal equipment from decompressed data grouping, restore (re-lease) packet according to this puppy parc according to this point-to-point protocol.
In the present invention, the packet of packet radio network package outside data network and their are passed point to the agreement of support encapsulated data packet by one or more subnets.On this interface, the grouping of external network is restored from this encapsulation and is sent to an outer data network.Like this, at moving data terminal equipment with serve between the support node of this moving data terminal equipment and must have general standardization agreement, described agreement provides the user data transmission that is independent of network, transmits used higher level protocol.Realized after a kind of so independent agreement, communicated by letter with the outer data network of which kind of type that this data terminal equipment can both provide a transmission pathway for all application no matter use.According to the present invention, adopt for example point-to-point protocol PPP of definition in the standard RFC 1661 and 1662 of Inter-net architecture bulletin board (IAB), and its data encapsulation method is as the grouping wireless network internal agreement of the packet of package outside data network.Yet PPP does not provide the link layer operation by wave point required all functions, especially in the quantity of transmission error can very big environment.Therefore, on the wave point of grouping wireless network, between moving data terminal equipment and support node, require to have a kind of special radio link protocol that all essential functions can be provided.Two most important aspects that provided by this agreement are to support some control to be transmitted in multiple spot addressing and packet.As the result of this scheme, the PPP information packet encapsulation transmits in the packet of this Radio Link association instrument.Can place the PPP information grouping in the radio link protocol grouping by many modes: a PPP grouping is placed in the radio link protocol grouping, a plurality of PPP groupings are placed in the radio link protocol grouping, and a PPP grouping is placed in a plurality of radio link protocol groupings.One of shortcoming of this protocol processes is that the Frame of PPP and this radio link protocol all comprises the used control domain of agreement.Usually, all these information all have to carry out end-to-end transmission.Consequently the expense control data of link layer has reduced the transmission capacity of user profile.In order to address this problem, the amount of the control data of link layer must minimize.According to the present invention, this realizes by leaving out in the PPP information frame some or all unnecessary territories.This is possible, because in the PPP information frame, and tag field, the value of address field and control domain is constant, thereby does not comprise any actual information.Like this, according to the present invention, before sending the PPP information frame, compress these PPP information frames by therefrom leaving out to the small part control domain by wireless pathway.Because the territory of being left out is constant, after by wireless pathway transmission, can easily these territories be joined in the compressed data frames again.Because the Frame according to this radio link protocol comprises a special-purpose verification and territory, before transmitting by wave point, if desired, verification and the territory that also can ignore the PPP information frame, and this verification and can recomputate and once more this verification and territory be joined in the compressed packet that sends by wave point.Ppp protocol according to this standard can also comprise byte of padding, is used for preventing the appearance of bit mode used in the control of data field.Because according to the present invention, the PPP frame is encapsulated in the wave point grouping and sends on wave point, and these forbidden bit modes can not exert an influence to transmission.Like this, according to the present invention, before sending to wave point, these byte of paddings can be left out from data, and turn back to this data after transmitting by wave point.This is the conventional data procotol that provides in the terminal equipment in order to be modified in, and utilizes compression method of the present invention, can improve the transmission capacity of user data greatly.
The PPP frame comprises a protocol-identifier territory, and its value sign is used the agreement that is adopted.Grouping wireless network arrives the encapsulated data packet pathfinding nexus or outer data network point of supporting by the indicated agreement of this identification field.At this moment, divest its encapsulation, the original data packet pathfinding is arrived its destination based on the address information that original data packet comprised.
By preferred embodiment the present invention is described hereinafter with reference to accompanying drawing, in the accompanying drawings
Fig. 1 is the block diagram of explanation packet radio network of the present invention;
Fig. 2 is the figure of the encapsulation of explanation packet;
Fig. 3 shows a PPP information frame;
Fig. 4 A, B, C, D, E, F and G have illustrated in encapsulation, compression, transmission, decompress(ion) and the different protocol frame that removes encapsulated phase.
The present invention can be used for dissimilar packet radio networks.The present invention is particularly useful in pan-European mobile communication system GSM (global system for mobile communications) or corresponding digital system, for example realization of general packet radio service (GPRS) among DCS1800 and the PCN (personal communication network (PCN)).Below will describe the preferred embodiments of the present invention, yet the present invention but is not restricted to a kind of so specific packet radio network by GPRS service and gsm system.
Fig. 1 has illustrated the basic structure of GPRS grouping wireless network.One or more subnets coverage in this GPRS packet radio network, for example SA1 and SA2 form, and SA1 and SA2 are by a GPRS backbone network 1 (backbone network) interconnection.Backbone network generally is the operator's of grouping wireless network a local network, for example an IP network.Subnet coverage SA1 and SA2 comprise one or more packet data serving nodes, are called agency or GPRS Support Node.Fig. 1 shows GPRS Support Node SN1 and SN2.One or more GPRS Support Nodes also can serve as the site support node towards outer data network, for example lead to the gateway support node of a public packet switched data net PSPDN.Also can provide the special gateway that is connected to data network node to backbone network 1.
The one or more cellular zone inner control packet data service of each GPRS Support Node in the honeycomb grouping wireless network.For this reason, each support node SN1 and SN2 are connected on the specific local part of GSM mobile system.This connection is generally set up by IWF IWF in mobile switch MSC, but in some cases, in base station system BSS, promptly directly provides this connection more favourable in base station controller BSC or a base station BTS.The mobile radio station MS that is arranged in certain cellular unit communicates by letter with certain base station BTS by wave point, and further by mobile radio communication and GPRS Support Node SN1, SN2, SN3 communication, this cellular unit belongs to the coverage of these nodes.In principle, the mobile radio communication that is present between GPRS Support Node and this moving data terminal equipment MS only transmits grouping between the two.For this reason, this mobile radio communication can and provide between the support node SN of service at terminal equipment MS a circuit switching connection or packet switched data transmitted in packets are provided.In Finnish patent application 934115, provided the example that the circuit switching between terminal equipment MS and the support node (agency) connects.In Finnish patent application 940314, provided an example of the packet switched data transmission between terminal equipment MS and the support node (agency).Yet, should be noted that mobile switching network only provides a physical connection between terminal equipment MS and this support node, operation and structure that it is definite do not have significance to the present invention.Yet the more detailed description about gsm system can be with reference to ETS I/GSM standard and " The GSM System for Mobile Communi-cation ", M.Mouly and M.Pautet, Palaiseau, France, 1992, ISBN:2-9507190-07-7.
General moving data terminal equipment is made up of mobile radio station 3 in the mobile radio communication and a portable computer 4 being connected to the data-interface of this mobile radio station.Mobile radio station 3 can be a Nokia2110 who is for example produced by the Nokia Mobil Co., Ltd of Finland.By the Nokia cellular data card of the PCM-CIA type of being produced by the Nokia Mobil Co., Ltd of Finland, the data-interface of this mobile radio station can be connected to any portable PC that has a pcmcia card position.X.25 or Internet protocol IP like this, this pcmcia card offers access point of PC, and this access point is supported the telecommunications application protocol that computer 4 is adopted, and for example CCITT.Alternatively, mobile radio station 3 also can directly provide the access point of the agreement that an application of supporting PC4 adopts.Further, mobile radio station 3 and PC can be integrated in the unit, using program tape in this unit has an access point of supporting the agreement that it adopts.
Obviously, the mobile subscriber will ask to be linked in the different pieces of information network by a grouping wireless network.This requirement, for example this gprs system must can with dissimilar outer data network PSPDN, for example Internet and X.25 net work together.This means that this gprs system has to support the different network addressing schemes (and network address) and the data packet format of different agreement.
Figure 2 illustrates a kind of general mechanism, can in the GPRS data network, realize supporting the transfer of data of many outside PSPDN networks by this mechanism.Its thought is, for example by data terminal equipment MS application sent, the packet of the agreement that certain outside PSPDN adopted, be encapsulated in this data terminal equipment in the frame format that GPRS network adopts, described frame format is independent of the agreement of application of this data terminal equipment or the agreement of outside PSPDN.This GPRS grouping also comprises this terminal equipment maybe information of the agreement that adopts of this application and the data that this terminal equipment is sent.This GPRS grouping is from data terminal equipment MS pathfinding and send to the GPRS Support Node that service is provided to it, and described GPRS Support Node is given to GPRS network point or the outside PSPDN nexus of supporting this application protocol before dividing into groups this GPRS further.When GPRS grouping arrives this, separate this GPRS grouping and encapsulation, and the address date that utilizes in the original packet to be provided changes this original packet before further.Because encapsulation, even GPRS network itself can not directly be supported described agreement, this GPRS network still can the preceding grouping of changeing different agreement.
In order to realize according to purpose of the present invention, must provide a kind of general at data terminal equipment MS with between it provides the support node SN of service, standardization agreement, described agreement provide and are independent of the transport layer that PSPDN network and described PSPDN network adopted and the above-mentioned host-host protocol of high-level communications protocol.Realized a kind of so independent standalone protocol, data terminal equipment MS can provide the transmission pathway for all application that are associated with it.According to a preferred embodiment of the invention, the inside packet format of GPRS network is consistent with the data encapsulation form of the PPP(Point-to-Point Protocol) of definition in the standard RFC 1661 and 1662 of In-ternet architecture bulletin board (IAB) in fact.PPP uses principle, term and the frame structure of ISO-3309-1979 High-Level Data Link Control (HDLC) process.Below ppp protocol will be described briefly.
PPP is a kind of tunneling that is used for bit-oriented synchronization link and async link, and these links have 8 Bit datas, do not have parity check bit.PPP is through designing carefully to keep the compatibility to most common softwares.In addition, it has a kind of escape mechanism of appointment, and this mechanism allows any character (need not provide in data and explain the framing control character, for example begin/character of end mark) is being provided on the link.This realizes by following manner, and it is right promptly to be replaced by two characters corresponding to the data character of frame control character in transmission, and is back into original spcial character when receiving.
PPP encapsulation is multiplexing different network layer protocol on single link also.Like this, can think that PPP is large-scale various computing machine, the interconnection of bridge and router provides a kind of scheme of passing through.
Point-to-point protocol PPP not only defines a kind of encapsulation principle.Can be sufficiently general for it to be sent to varying environment, PPP provides controlling links association's justice (LCP).LPC is in order to automatic negotiation encapsulation format option, handle the difference restriction of package size, the sign of authentication its opposite end on this link, judge when a link is just in operate as normal, and when it does not have operate as normal, check annular link and other common configuration error, and stop this link.
Figure 3 illustrates the general status of standard P PP frame structure.Yet Fig. 3 does not comprise beginning/end bit (being used for async link), is not depicted as transparent transmission and bit or the eight bit byte inserted in frame yet.
Flag sequence FLAG is an independent eight bit byte, the beginning or the end of a frame of its indication.Between frame, only need a mark.An empty frame has been formed in two continued labellings, and it is left in the basket.Address field ADDRESS is an independent eight bit byte, and it comprises two system sequences 11111111, and (hexadecimal 0 * ff), it is a so-called all-station address.In other words, PPP offers the identical address of all websites, and the address of single website is not provided.Control domain CONTROL is an independent eight bit byte, and it comprises two system sequences 00000011 (hexadecimal 0 * 03).Control domain comprises a nonnumerical information (UI) order, and the P/F bit is changed to 0 in this order.Protocol domain PROTOCOL comprises two eight bit bytes, and its value is identified at the agreement of packet packaged in the information field of UI frame, and this protocol domain is defined by PPP, and it is not defined among the HDLC.Yet this agreement expands machine-processed consistent with ISO 3309 address fields.
Although select PPP as data encapsulation method in the GPRS network in a preferred embodiment of the invention, PPP can not provide the required all functions of link layer operation by wave point.This means on the wave point between terminal equipment MS and the support node SN, to need and a kind ofly can provide all special specific GPRS radio link protocol GLP that must function.GLP can be an agreement based on HDLC, and is very similar to the radio link protocol RLP that gsm system has adopted.Most important two aspects that GLP provided are to support some control to be transmitted in multiple spot addressing and Frame.It should be noted that the GLP agreement is not essential to the invention now really conscientiously.Yet the territory that territory that the frame structure of GLP (packet format) comprises and PPP frame are comprised is similar, i.e. data field, control domain, address field, tag field and verification and territory.The PPP frame is encapsulated in the data field of these GLP frames and transmits between terminal equipment MS and support node SN by wireless pathway.One of shortcoming that this frame is handled is that PPP and GLP Frame all comprise control domain, address field, mark, verification and or the like.Usually, all these information must be carried out end-to-end transfer.The overhead data of these link layers has reduced the transmission capacity of user profile.
According to the present invention, this problem is avoided by being minimized in the control data amount that transmits on the wave point.This realizes in the following manner, promptly before the PPP information frame is encapsulated into the GLP Frame, leaves out a part from this PPP information frame, perhaps preferably whole unnecessary territories.This is possible, because used mark in the PPP information frame, the value of address and control domain is constant, does not comprise actual information like this.Test and the territory FCS of PPP information frame also can ignore because the verification that the GLP Frame uses it with, occur in mistake on the wave point by this verification and detection and correction.In general, terminal equipment MS and support node SN these PPP information frames of compression before the PPP information frame is encapsulated into the GLP Frame and transmits by wave point.Correspondingly, terminal equipment MS and support node SN shift out from the GLP Frame by compressing the PPP information frame, to wherein adding the territory of being left out, the content in these territories is constant, thereby as can be known, and calculate the new verification of the PPP information frame that is returned and come the compression PPP information frame of decompress(ion) by the wave point transmission by a kind of known verification and computational algorithm.
Encapsulation of the present invention, compression, decompress(ion) and go encapsulated phase in Fig. 4, to illustrate.In Fig. 4 A, terminal equipment MS receives the Frame according to the employed agreement of application that is associated with described terminal equipment, for example 1,000 frames (or an IP frame or certain other frame) X.25.Terminal equipment MS by in the data field of PPP information frame, insert this X.25 Frame carry out encapsulation, shown in Fig. 4 B.Simultaneously, be arranged on value among the protocol domain PROTOCOL of PPP information frame to indicate the agreement of packaged packet, promptly X.25.Afterwards, terminal equipment is by therefrom leaving out mark, and this PPP information frame is compressed in address, control and verification and territory.Its result's compression PPP information frame is shown in Fig. 4 C, by encapsulating in the data field that is inserted into the GLP Frame, shown in Fig. 4 D.This GLP Frame sends base station BTS from terminal equipment MS to by wave point, and from the there further by the support node SN of mobile radio communication pathfinding to the current cellular unit of serving this MS.In Fig. 4 E, support node SN shifts out compression PPP information frame from this GLP Frame according to Fig. 4, and by returning the mark of therefrom leaving out to this PPP information frame, address and control domain are carried out decompress(ion), and the content in these territories is constant.In addition, new verification of the PPP information frame that support node SN calculate to form by following manner and FCS promptly utilize for this reason and the computational algorithm that keeps.Consequently according to the decompress(ion) PPP information frame of Fig. 4 F.If provide the support node SN of service itself not to be supported in the agreement of indicating in the PROTOCOL territory, it supports this PPP information frame forward direction pathfinding the point of described agreement in GPRS network or in the outer data network, when this PPP information frame arrived this point, frame divested encapsulation by shifting out X.25 from the data field of PPP information frame.Afterwards, according to X.25 address of frame own and control domain are handled this X.25 frame.
If provide the support node SN of service to support to provide the node oneself of service that encapsulation is divested by the indicated agreement in PROTOCOL territory, and based on the control of frame X.25 and address information with this X.25 frame forward direction transmission.
Stage according to Fig. 4 A-4G also appears in the transmission of leading to terminal equipment MS.In the PPP information frame X.25 the encapsulation of frame occur in the node of service SN or the somewhere on GPRS network and outer data network interface be provided.According to the compression of the PPP information frame of Fig. 4 C with according to being inserted in to provide among the support node of the service SN and carrying out of compression PPP frame in the GLP Frame of Fig. 4 D.According to Fig. 4 E, the decompress(ion) of 4F and 4G is carried out with going to be encapsulated among the terminal equipment MS, and X.25 frame is before forwarded to the application that is associated with this terminal equipment MS afterwards.
It should be noted that standard P PP agreement has its compression domain method.This method can be made, and therefore can consult the use of compression method during the link configuration process.Yet this standard P PP compression can not be used in the present invention.
Standard P PP agreement also comprises so-called byte filling agreement.Like this, particular bit pattern for example for the content that tag field kept, is converted into two byte serials in the data field of PPP frame.This is a kind of method of for example guaranteeing to cause for other status that these bit modes that tag field keeps can not appear at message fault.Yet these byte of paddings cause problem in GPRS network, because the data volume that sends by wave point is not independent of data, but relevant with the content of data.Under worst case because byte of padding, the length of data may be it should the twice of length.Because the PPP information that sends by wave point is arranged in the GLP frame of GPRS network, this " forbidding " control bit pattern in data field can not resemble string line and cause fault, for example the error detection of the beginning/end of a frame.Therefore, in a preferred embodiment of the invention, before transmitting, leave out all padding datas, and in the decompression phase of the opposite side of wave point, return these byte of paddings at compression stage by wave point.These data also can be passed through other method, and for example by using used V42 in the modulator-demodulator, bis compresses.
If the PPP grouping, also can merge several PPP groupings less than the size of the data field of GLP grouping in a GLP frame, this GLP frame sends by wave point.Also can in several GLP groupings, send a PPP grouping.
Also can only in gateway node, carry out according to compression of the present invention and/or decompress(ion), and compressed data packet is changeed before by the support node of serving this mobile radio station.
Relevant figure and description only are used to illustrate the present invention.In the scope and spirit of appended claims, packet radio network of the present invention and terminal equipment can change in detail to some extent.
Claims (16)
1. a packet radio network comprises
A digital mobile communication network;
At least one packet radio support node is connected to this mobile radio communication and is connected to one or more other packet radio support nodes, and/or is provided to the access point of an external packet data network;
One for the packet data transmission that takes place by wave point provides the grouped data terminal equipment of an access point, the common communication protocol that the application that described access point support is associated with this terminal equipment is adopted,
It is characterized in that,
In the internal transmission of this packet radio network, use a kind of point-to-point protocol that is independent of described common communication protocol, packet according to described point-to-point protocol comprises the used control domain of this agreement, the identification field of a sign agreement that this terminal equipment adopted, and data field, like this, in the internal transmission of this packet radio network, be encapsulated in the data field according to the packet of this point-to-point protocol according to the packet of this puppy parc
On wave point, use a kind of special radio link protocol between grouped data terminal equipment and described at least one packet radio support node, described radio link protocol support is a bit transmitted control to multiple spot addressing and packet, packet according to described radio link protocol comprises the used control domain of this agreement and a data field
By therefrom leaving out at least one control domain, this grouped data terminal equipment and described at least one support node compression are sent by wave point, according to the packet of this point-to-point protocol, and remaining territory is encapsulated in the data field according to the packet of this radio link protocol
Before this packet was by commentaries on classics before further, the territory of leaving out by being added in the compression made this grouped data terminal equipment and described at least one support node decompress(ion) receive by wave point, according to the compressed data packet of this point-to-point protocol.
2. according to the packet radio network described in the claim 1, it is characterized in that, described at least one support node comprises a support node of serving this mobile radio station, with one provide towards the gateway support node of the access point of external packet data network, and carry out conciliating to be pressed on this gateway support node by the described compression of the packet changeed before the support node of serving this mobile radio station.
3. according to the packet radio network described in claim 1 or 2, it is characterized in that this point-to-point protocol comprises a protocol-identifier territory, data field, verification and territory and constant address, control and tag field.
4. according to the packet radio network described in the claim 3, it is characterized in that described point-to-point protocol comes down to the point-to-point protocol PPP according to standard RFC 1661 and 1662.
5. according to the packet radio network described in claim 3 or 4, it is characterized in that,
In grouped data terminal equipment or the compression in described at least one support node comprise and from grouping, leave out at least one constant territory according to this point-to-point protocol,
In grouped data terminal equipment or the decompress(ion) in described at least one node comprise that the constant territory of will be left out returns to the grouping according to this point-to-point protocol.
6. according to the packet radio network described in the claim 3,4 or 5, it is characterized in that,
In grouped data terminal equipment or the compression in described at least one support node also comprise and from grouping, leave out verification and territory according to this point-to-point protocol,
This grouped data terminal equipment and described at least one node comprise a kind of calculating according to the verification of this point-to-point protocol and the computational algorithm in territory,
In grouped data terminal equipment or the decompress(ion) in described at least one node comprise that the constant territory of will be left out returns to the grouping according to this point-to-point protocol, and utilize described computational algorithm calculation check and territory afterwards.
7. according to the packet data radio system described in any one aforementioned claim, it is characterized in that,
In grouped data terminal equipment or the compression in described at least one support node also comprise from data field and leave out byte of padding according to the grouping of this point-to-point protocol,
In grouped data terminal equipment and the decompress(ion) in described at least one node comprise that the byte of padding of will be left out joins in the data field according to the packet of this point-to-point protocol.
8. according to the packet data radio system described in any one aforementioned claim, it is characterized in that,
In grouped data terminal equipment or the compression in described at least one support node comprise two or more packets according to the compressed format of this point-to-point protocol be encapsulated in data grouping according to this radio link protocol.
9. according to the packet radio network described in any one in the claim 1 to 7, it is characterized in that,
In grouped data terminal equipment or the compression in described at least one support node comprise a data grouping according to the compressed format of this point-to-point protocol be divided in two or more packets according to this radio link protocol.
10. according to the packet radio network described in claim 1 or 2, it is characterized in that, according to the packet of using the agreement that is adopted, described packet is encapsulated in data terminal equipment in the packet according to this point-to-point protocol, in the encapsulation of getting on of the packet radio network of supporting the agreement that described protocol-identifier territory is indicated or outer data network point.
11. the packet radio network according to described in the claim 1 is characterized in that, also can be by using the compression method that adopts usually, and for example V.21.bis algorithm compresses according to the packet of using the agreement that is adopted.
12. the terminal equipment of a packet radio network, described terminal equipment provides an access point for the packet data transmission of being undertaken by wave point, and the common communication protocol that the application that described access point support is associated with this terminal equipment is adopted is characterized in that,
In the internal transmission of packet radio network, this terminal equipment uses a kind of point-to-point protocol that is independent of described common communication protocol, packet according to described point-to-point protocol comprises the used control domain of this agreement, the identification field of a used agreement of this terminal equipment of sign, and data field
In the transmission of being undertaken by wave point, this terminal equipment uses a kind of special radio link protocol that is adopted in the transmission between the node of this packet radio network, any control of described agreement support to multiple spot addressing and packet forwarding, packet according to described radio link protocol comprises the used control domain of this agreement and a data field
Terminal equipment will be encapsulated into according to the transmission packet of this puppy parc in the data field according to the packet of described point-to-point protocol,
By therefrom leaving out at least one control domain, this terminal equipment compression is sent by wave point, according to the packet of this point-to-point protocol, and remaining territory is encapsulated in the packet according to this radio link protocol,
By being added in the territory of leaving out in the compression, this terminal equipment decompress(ion) is received by wave point, according to the compressed data packet of this point-to-point protocol,
Make this terminal equipment from according to the packet of isolating the grouping of the decompressed data of this point-to-point protocol according to this puppy parc.
13. the terminal equipment according to described in the claim 12 is characterized in that, described point-to-point protocol comes down to the point-to-point protocol PPP according to standard RFC 1661 and 1662.
14. the terminal equipment according to described in claim 12 or 12 is characterized in that, described point-to-point protocol comprises a protocol-identifier territory, data field, verification and territory and constant address, control and tag field.
15. the packet radio network according to described in the claim 14 is characterized in that,
Compression comprises the territory of leaving out at least one fixed value from the grouping according to this point-to-point protocol,
Decompress(ion) comprises that the territory of the fixed value that will be left out returns to the grouping according to this point-to-point protocol.
16. the packet radio network according to described in claim 14 or 15 is characterized in that,
In grouped data terminal equipment or the compression in described at least one support node also comprise and from grouping, leave out verification and territory according to this point-to-point protocol,
Grouped data terminal equipment and described at least one node comprise a kind of calculating according to the verification of this point-to-point protocol and the computational algorithm in territory,
In grouped data terminal equipment and the decompress(ion) in described at least one node comprise that the constant territory of will be left out returns to the grouping according to this point-to-point protocol, and utilize described computational algorithm calculation check and territory afterwards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96191404A CN1169806A (en) | 1995-01-10 | 1996-01-08 | Package radio system, and terminal equipment for a package radio system |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI950117 | 1995-01-10 | ||
| CN96191404A CN1169806A (en) | 1995-01-10 | 1996-01-08 | Package radio system, and terminal equipment for a package radio system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1169806A true CN1169806A (en) | 1998-01-07 |
Family
ID=5128190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96191404A Pending CN1169806A (en) | 1995-01-10 | 1996-01-08 | Package radio system, and terminal equipment for a package radio system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1169806A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1293734C (en) * | 2001-03-12 | 2007-01-03 | 高通股份有限公司 | Method and apparatus for providing multiple quality of service levels in wireless packet data services connection |
| CN1645865B (en) * | 1998-05-12 | 2010-06-16 | 索尼公司 | Data transmission controlling method and data transmission system |
| CN101772079B (en) * | 2001-02-16 | 2011-10-05 | 高通股份有限公司 | Method for selectively maintaining and applying PPP compression in a wireless communication system |
| CN107037756A (en) * | 2017-04-17 | 2017-08-11 | 北京京东尚科信息技术有限公司 | Data transmission method and device |
| US11418276B2 (en) * | 2020-07-31 | 2022-08-16 | Ufi Space Co., Ltd. | Byte stuffing circuit and byte stuffing method |
-
1996
- 1996-01-08 CN CN96191404A patent/CN1169806A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1645865B (en) * | 1998-05-12 | 2010-06-16 | 索尼公司 | Data transmission controlling method and data transmission system |
| CN101772079B (en) * | 2001-02-16 | 2011-10-05 | 高通股份有限公司 | Method for selectively maintaining and applying PPP compression in a wireless communication system |
| CN1293734C (en) * | 2001-03-12 | 2007-01-03 | 高通股份有限公司 | Method and apparatus for providing multiple quality of service levels in wireless packet data services connection |
| CN107037756A (en) * | 2017-04-17 | 2017-08-11 | 北京京东尚科信息技术有限公司 | Data transmission method and device |
| US11418276B2 (en) * | 2020-07-31 | 2022-08-16 | Ufi Space Co., Ltd. | Byte stuffing circuit and byte stuffing method |
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