WO2006069479A1

WO2006069479A1 - A method and system for realizing multi-link convergence in umts system

Info

Publication number: WO2006069479A1
Application number: PCT/CN2004/001548
Authority: WO
Inventors: Sheng Liu; Baijun Zhao; Gaoquan Lin
Original assignee: Utstarcom Telecom Co., Ltd.
Priority date: 2004-12-28
Filing date: 2004-12-28
Publication date: 2006-07-06
Also published as: CN101091335A

Abstract

A wireless communication system includes user terminal device, radio access network linking with the user terminal device via air interface(Uu), GPRS packet data network, and external packet data network, wherein said GPRS packet data network includes service GPRS supporting node (SGSN) and gateway GPRS supporting node (GGSN). Said user terminal device supports multi-link convergence and said gateway GPRS supporting node supports multi-link convergence. A method for data transmission includes the steps of : establishing first PLMN carrying channel by first wireless Modem by means of packet data protocol context activation process; establishing second PLMN carrying channel by second wireless Modem by means of packet data protocol context activation process; converging the first PLMN and second PLMN carrying channel into an ML-PPP logic link; and transmitting data over said logic link.

Description

Method and system for implementing multi-link aggregation in UMTS system

The present invention relates to a wireless transmission technology for packet data in a mobile communication system, and more particularly to a method and system for increasing data transmission rate by using multiple link aggregation of multiple wireless modems in a UMTS system. Background technique

1. Multilink aggregation technology in current wireless data access

As the proportion of wireless data services in wireless communication services continues to increase, the demand for data transmission bandwidth is also increasing. However, limited by the spectrum resources, device complexity and terminal power consumption, the data rate supported by a single wireless communication modem (modem) is often low, which is difficult to meet the needs of high-speed data services, and due to changes in the channel environment and The impact of interference, the reliability of the higher rate wireless link is not high. Therefore, for some broadband wireless data access applications, such as broadband wireless data access services for small and medium-sized companies or enterprises, how to provide high-speed and reliable wireless data access is a key issue.

P. Rodriguez, R. Chakravorty et al. in the paper "MAR: A Commuter Router Infrastructure for the Mobi le Internet" (available at http://edit, microsof t. com/pablo/papers/mobisysQ4.pdf) A wireless data access system called MAR (Mobi le Access Router) is proposed. The system allows wireless links of different wireless communication networks, such as UMTS (Universal Mobile Telecommunications System), GPRS (General Packet Data Service), WLAN (Wireless Local Area Network), etc. to be aggregated together to achieve higher data rates, as shown in Figure 1. Shown. Although the MAR has the capability of multi-link aggregation of different systems, the system requires a special MAR access server to achieve multi-link aggregation, and multi-link aggregation will be required due to the large delay difference of different data links. Larger capacity caches result in larger end-to-end transmission delays.

For applications that use a single wireless communication system (eg, using a UMTS network) based on multi-link aggregation to provide high speed and reliable wireless data access, the transmission paths experienced by each link in the wireless communication system are similar, and thus may Take more efficient multi-link aggregation technology to reduce end-to-end transmission delay and reduce system complexity. In addition, for such applications using the MAR system, the wireless modems corresponding to each link need to occupy different network layer addresses respectively (ie, Multiple IP address resources are required. Therefore, more efficient multi-link aggregation technology is also needed to avoid the consumption of the above system resources.

2. Point-to-Point Protocol (PPP) and Multilink Point-to-Point Protocol (ML-PPP)

Point-to-Point Protocol (PPP) provides a method for transmitting multi-protocol datagrams over a point-to-point link. It consists of three main components: a method of encapsulating multi-protocol datagrams; used to establish, configure, and Test Link Control Protocol (LCP) for data link connections; and Network Control Protocol Suite (NCP) for establishing and configuring different network layer protocols. Among them, LCP packets are divided into three categories: link configuration packets (Configure-Request, Conf igure-Ack Conf igure-Nak, and Conf igure-Reject) for establishing and configuring links, which are used to terminate links with links. Termination packets ( Terminate-Request, Terminate-Ack, Terminate-Request, and Terminate-Ack), and link maintenance packets for managing and testing links (Code-Reject;, Protocol-Reject s Echo-Request;, Echo- Reply ^ Discard-Request ).

In order to establish communication on a point-to-point link, each end of the PPP link must first send an LCP packet to configure and test the data link. After the link is established, the peer can authenticate, and then the PPP must The NCP packet is sent to select and configure one or more network layer protocols. Once the configuration of the network layer protocol is completed, the data packet can be sent on the link until the link is explicitly closed with the LCP packet.

The Multilink Point-to-Point Protocol (ML-PPP) is a protocol that extends PPP to take full advantage of link bandwidth. The ML-PPP specification extends three LCP options related to multi-link operation, namely MRRU (Multilink Maximum Receive Reconstruction Unit), Multilink Short Sequence Header Format, and Endpoint Discriminator on the PPP link. During the establishment, these three options are used. When there are more than one physical link on the same two ends, each physical link can be aggregated into a logical link bundle, thereby providing a multi-link aggregation for the upper layer protocol. A logical link with increased bandwidth. Once the multilink is successfully established through LCP negotiation, the sender system can freely transmit data with a multilink header, where ML-PPP encapsulates the PPP multilink segmentation data using the protocol identifier 0x00-0x3d. According to the IETF specification for ML-PPP, RFC1990, the packet scheduling policy of each member link in the ML-PPP multi-link, it is possible to divide the original number of segments by the original link group and then allocate the year-on-year number according to the member link rate, or The original packet is divided into segments of a corresponding proportion according to the transmission rate of each member link.

3. Problems to be solved by the present invention

As mentioned earlier, due to the complexity of the device and the power consumption of the terminal, a single wireless modem The user access rate that can be provided is limited. In order to realize high-speed and reliable wireless data access by using an existing wireless modem, the present invention proposes an effective wireless system that minimizes end-to-end transmission delay and wireless network device complexity without requiring a dedicated access server. Method and system for interface multi-link aggregation. At the same time, the present invention occupies only one IP address when accessing an APN (access point) by using multiple links, thereby saving limited IP address resources. Summary of the invention

According to an aspect of the present invention, a wireless communication system is provided, comprising: a client device; a radio access network linked to the client device through an air interface (Uu); a GPRS packet data network; and an external packet data network The GPRS packet data network includes a Serving GPRS Support Node (SGSN) and a Gateway GPRS Support Node (GGSN); wherein: the user terminal device supports multi-link aggregation, and the gateway GPRS support node supports multiple links; The road gathers.

According to another aspect of the present invention, there is provided a method of transmitting data in a wireless communication system, wherein the wireless communication system comprises: a client device; wireless access linked to the client device over an air interface (Uu) a GPRS packet data network; and an external packet data network; wherein the GPRS packet data network includes a Serving GPRS Support Node (SGSN) and a Gateway GPRS Support Node (GGSN); the user terminal equipment includes at least first and second a wireless Modem pool portion, a link control unit, and an application portion of the wireless Modem; and the gateway GPRS support node supports multi-link aggregation; the method includes the steps of: (a) the first wireless Modem passes a packet data protocol context The activation process establishes a first PLMN bearer channel; (b) the second wireless Modem establishes a second PLMN bearer channel by a packet data protocol context activation procedure; (c) converges the first and second PLMN bearer channels into one ML-PPP logical link; and (d) transmitting data on the logical link. DRAWINGS

Figure 1 is a schematic diagram of the structure of the MAR network;

2 is a schematic diagram of a UMTS network structure;

3 is a system for implementing wireless interface multi-link aggregation based on the present invention;

Figure 4 is a schematic diagram of multi-link aggregation when IP interworking and PPP termination are adopted;

FIG. 5 shows a multi-link aggregation signaling procedure when the GGSN and the external packet data network adopt IP interworking; Figure 6 shows an option structure of the endpoint discriminator;

FIG. 7 shows a multi-link aggregation signaling procedure when the GGSN and the external packet data network communicate with each other in the PPP termination mode;

FIG. 8 is a schematic diagram of multi-link aggregation when the PPP relay mode is adopted;

Figure 9 shows the multi-link aggregation signaling flow when the GGSN communicates with the external packet data network using the PPP relay mode. detailed description

As shown in FIG. 2, the packet domain UMTS network mainly includes two parts: a UMTS radio access network (UTRAN) and a GPRS packet data network, wherein the UTRAN is composed of a Node B (Node B) and an RNC (Radio Network Controller), and the GPRS packet is formed. The data network consists of an SGSN (Serving GPRS Support Node) and a GGSN (Gateway GPRS Support Node). The UE (User Equipment) is connected to the UTRAN through the air interface, that is, the Uu interface, and the UTRAN is connected to the SGSN through the Iu-PS interface. The interface between the SGSN and the GGSN is a Gn interface, and the interface between the GGSN and the external packet data network is a Gi interface. The UE can be further divided into TE (terminal equipment) and MT (mobile terminal) in structure, and the function of the UE side Uu interface protocol is completed by the MT. For a detailed description of the UMTS network structure and packet domain, refer to the protocol specifications of TS23.002 and TS23.060 of 3GPP (Third Generation Partnership Project).

Figure 3 shows the system architecture for implementing multi-link aggregation in a UMTS system based on the present invention. The user equipment is a user equipment supporting the multi-link aggregation function shown in the figure, and the user equipment is structurally divided into a wireless modem pool part, a link control unit, and an application part. The wireless modem pool is composed of a plurality of independent wireless modems, and each wireless modem has different IMSI (International Mobile Subscriber Identity), and independently performs the function of the UE-side Uu interface protocol, that is, the respective maintenance and the UMTS access network and the core network. Corresponding protocol status and protocol processing; The link control unit is responsible for aggregating the links corresponding to the respective wireless modems, and is responsible for the link management and control functions; the application part includes the functions of the application layer of the user terminal. On the network side of the structure shown in FIG. 3, the radio access network part is the same as the prior art, and the GGSN adds support for multi-link aggregation in comparison with the prior art in the GPRS packet data network part.

According to the 3GPP specification TS29. 061, the interworking between GGSN and external packet data networks is typically divided into IP and PPP types, which are respectively classified into IP transparent transmission and IP non-transparent transmission, and PPP termination and PPP. Relay mode. The specific intercommunication method is usually determined by the interconnection agreement between the PLMN (Public Land Mobile Network) operator and each APN corresponding Intranet/ISP. In the IP transparent/non-transparent transmission mode, the user is grouped into an IP packet, and the GGSN is equivalent to a router for the external packet data network. The difference between the two methods is: In the IP non-transparent transmission mode, the PDP Context (Packet Data Protocol) Context) During the setup process, the GGSN performs IP address assignment and user authentication via the Radius and DHCP (Infrared Service Provider) Radius and DHCP servers through the Radius Proxy and DHCP (Dynamic Host Configuration Protocol) proxy functions. To do this, the UE shall attach the IE (Information Element) option of the "Protocol Configuration Option" when initiating the activation of the PDP Context request, and the SGSN transparently passes it to the GGSN, which carries the user in the IE. Information such as user accounts necessary for authentication to the intranet/ISP.

In the PPP termination and PPP relay mode, the user group is a PPP packet, and the PPP connection mode PPP connection is established between the GGSN and the TE. After the PDP Context is established, the GGSN passes the Radius proxy and the DHCP proxy function via the intranet/ISP. The Radius and the DHCP server perform IP address allocation and user authentication, but the user account and other information required for authentication and the IP layer protocol configuration are transmitted by the LPP/NCP protocol of the PPP connection; the PPP connection mode PPP connection is established between the ISP and the TE. The GGSN transparently forwards the PPP packet to the intranet/ISP through a tunneling protocol such as L2TP (Layer 2 Tunneling Protocol), and the functions such as IP address allocation and user authentication are performed by the Intranet/ISP.

According to the present invention, when the interworking of the GGSN and the external packet data network adopts an IP transparent or non-transparent transmission mode, the multi-link aggregation implementation is as shown in FIG. 4. The wireless modems of the user end are respectively activated by the PDP Context to establish independent PLMN bearer channels, and the link control unit is responsible for implementing multi-link aggregation of the PLM bearer channels corresponding to the MM-PPP-based wireless modems on the user side, and the network side is based on The multi-link aggregation function of the ML-PPP is implemented at the GGSN, and the user IP packets are transmitted through a logical link aggregated by multiple links.

When the GGSN communicates with the external packet data network using IP transparent or non-transparent transmission mode, the PDP type is IP, and the user group is an IP packet. Therefore, the ML-PPP multi-link function is transparent to the existing protocol operation, that is, exists in multiple The above-mentioned PLMN bearer channel provides logically aggregated links for IP packets without changing the signaling related to the operation of PDP Context activation/deactivation, as described in TS24.008 and TS29.060, nor Affects the operation when the GGSN and the external packet data network according to TS 29.061 use IP interworking.

FIG. 5 takes the case of two wireless modems as an example, and shows a multi-link aggregation implementation signaling flow when the GGSN and the external packet data network adopt IP interworking. First, after power-on, the two wireless modems perform initialization operations such as GPRS attachment and PLM authentication, respectively, when the UE applies part. When accessing the external packet data network through UMTS, Modem #1 will establish a PLM bearer channel according to the PDP Context activation procedure described in TS24.008 and TS29.060. That is, as shown in FIG. 5, the Modem #1 sends an "Act ivate PDP Context Reques t" message to the SGSN to which it is attached, where the static IP address is allocated according to the 3GPP specifications. The PDP address in the message is the static IP address assigned by the UE. In the case of the dynamic IP address allocation, the PDP address in the message is empty. In addition, the IP non-transparent transmission mode is used. The message shall carry the IE option "Protocol conf igurat ion opt ions"; then, the SGSN sends a "Create PDP Context Reques t" message to the GGSN, for the IP non-transparent transmission mode, the IE option "Protocol" Conf igurat ion opt ions" will be transparently passed to the GGSN for ISP/Intranet authentication. After the GGSN completes the process of IP address allocation, authentication, etc., it sends a "Create PDP Context Response" message to the SGSN, and then the SGSN will communicate with the UTRAN and establish a corresponding RAB (Radio Access Bearer). Finally, the "Act ivate PDP Context Accept" message is sent to Modem #1, and Modem #1 will indicate that the UE side ML-PPP entity has successfully established the PLMN bearer channel.

According to the present invention, as shown in FIG. 5, when the UE decides to activate Modem #2 to increase the transmission bandwidth, the UE side ML-PPP entity will notify Modem #2 to activate to add a PLMN bearer channel, and Modem #2 will be as described above. The step is to establish a corresponding PLMN bearer channel, where the PDP address in the "Act ivate PDP Context Reques t" message sent by Modem #2 to the SGSN to which it is attached is assigned to the static IP address, and the PDP address in the message That is, the same static IP address assigned by the UE, and the allocation of the dynamic IP address, that is, the IP address assigned by the network when the PLMN bearer channel is established by Modem #1. For IP non-transparent transmission mode, Modem #2 will no longer carry "Protocol conf igurat ion opt ions" in the "Act ivate PDP Context Reques t" message, thus avoiding repeated ISP/Intranet authentication operations on the UE by the GGSN.

According to the present invention, as shown in FIG. 5, after the ML-PPP entity of the UE side obtains the indication that the Modem #2 has successfully established the PLMN bearer channel, the Modem #1 first initiates the ML-PPP entity in the GGSN. A basic PPP link is established on the PLM bearer channel, and the ML-PPP entity in the GGSN initiates a second PPP link on the built-in PLMN bearer channel and requests the link and Modem. 1 The corresponding basic PPP links are aggregated into one ML-PPP logical link bundle. In addition, the establishment of the PPP link on the PLMN bearer channel corresponding to Modem #1 is also It can be performed after Modem #1 completes the establishment of the PLMN bearer channel (as shown in step 6 in Figure 5). At this time, since the user packet increases the PPP header overhead, it has a slight impact on the transmission efficiency, but this operation mode will be The user plane is processed, that is, it is not necessary to judge whether the PPP header is attached or the corresponding processing in the user data transmission process.

Table 1: LCP Options "Endpoint Di scriminator" Class/Address Field Definition

Since a wireless modem may establish a PLMN bearer channel having multiple PDP addresses (here, IP addresses) but connecting different APNs, in order to indicate the required bundle to the GGSN The bundled PLM bearer channel needs to be authenticated by the combination of the APN and the UE's IP address in the ML-PPP LCP option "Endpoint Discriminator". According to the IETF (Internet Engineering Task Force) specification RFCI O, the structure of the LCP option "Endpoint Di scriminator" is as shown in Figure 6, where the Type field identifies the LCP option and the Length field is the byte length of the LCP option. The Class field indicates the type of the Address field used to identify the ML-PPP endpoint, where the assigned Class field value is 0-5, as defined in Table 1. As described above, the present invention requires endpoint authentication using APN in combination with a corresponding IP address. To this end, the present invention defines two Class field values (such as values 7 and 8 in Table 1), and two corresponding ones. The Address field (such as "GPRS Endpoint Identity 1" and "GPRS Endpoint Identi ty 2" in Table 1) corresponds to (IPv4 address + APN) and (IPv6 address + APN) respectively. Since the maximum length of the APN is 102 bytes, Therefore, the maximum length of these two Address fields is 106 bytes and 118 bytes, respectively.

According to the present invention, when the interworking of the GGSN and the external packet data network adopts the PPP termination mode, the multilink aggregation structure is still as shown in FIG. 5. However, the PDP type is PPP, that is, the user PPP packet is seen by the UMTS network. In this case, the operation of the PPP termination mode of the GGSN and the external packet data network described in TS29.061 is changed, that is, the corresponding operation should be increased. Support for ML-PPP. In the multi-link aggregation signaling flow using the PPP termination mode shown in Figure 7, the PLMN bearer channel corresponding to Modem #1 is still established as described in TS24.008 and TS29.060, and then in step 6, such as TS29. According to 061, a corresponding PPP connection is established on the PLMN bearer channel, and the LCP should carry the corresponding ISP/Intranet authentication option for ISP/Intranet authentication when establishing the PPP link, and also needs to run the PPP NCP protocol ( IPCP/IPV6CP) Obtain the IP address assigned by the ISP/Intranet.

As shown in Figure 7, when the UE decides to activate Modem #2 to increase the transmission bandwidth, the L-PPP entity on the UE side will notify Modem #2 to activate to add a new PL匪 bearer channel. At this time, Modem #2 will establish the corresponding PLM. The PDP address in the "Act ivate PDP Context Request" message sent by Modem #2 to the SGSN to which it is attached, and the PDP address in the message is the same as the above. The static IP address assigned by the UE is allocated to the dynamic IP address, that is, the IP address assigned by the network when the PLMN bearer channel is established by Modem #1. After the corresponding PLMN bearer channel of Modem #2 is established, the corresponding PPP connection will be established on the PLMN bearer channel. However, when the PPP link is established, the LCP no longer carries the corresponding ISP/Intranet authentication option. Run the PPP NCP protocol (IPCP/IPV6CP), but in order to associate the newly created PPP link with the PPP corresponding to Modem #1 The link is bundled into an ML-PPP link bundle. Modem #2 will carry the LCP option of the ML-PPP when the PPP connection is established. In order to indicate to the GGSN the required bundled PLM bearer channel, as described above, The LCP option "Endpoint Di scr iminator" of ML-PPP uses the combination of APN and corresponding IP address for endpoint authentication.

According to the present invention, the multi-link aggregation structure when the GGSN and the external packet data network are intercommunicated by the PPP relay mode is as shown in FIG. 8. At this time, the operation of the GGSN completely follows the PPP user packet on the PPP link corresponding to each wireless modem corresponding to the L2TP tunnel, as described in TS29.061, and the multi-link aggregation function is implemented on the access end of the ISP/Intranet. The multi-link aggregation signaling process in this mode is similar to the multi-link aggregation signaling process in the PPP termination mode, as shown in Figure 9. The difference is that the ML-PPP entity exists on the access end of the ISP/Intranet. In addition, the LCP option "Endpoint Discr iminator" used in establishing the ML-PPP logical link bundle directly uses the assigned IP address, that is, Class = 2 for IPv4 and the newly defined Class/Address field for IPv6, such as Table 1 shows.

In addition, due to the mobility of the UE and the independence of each wireless modem, the Node B, the RNC, and the SGSN to which the wireless modems of the user equipment supporting the multi-link aggregation function are connected may be different, even if the wireless modems are different. The SGSNs are connected to the same SGSN and access the same APN. In the prior art, the SGSN may access the APN through different GGSNs when the PDP Context of each wireless modem is established due to load sharing. Therefore, in order to enable the wireless modems of the same user equipment supporting the multi-link aggregation function to access the same APN via the same GGSN to complete the multi-link aggregation operation by the GGSN, according to the present invention, the "At" initiated by the UE to the SGSN In the IE "MS network capabi ty" of the tach Reques t" message, a new bit value is added to indicate to the attached SGSN whether the UE has multi-link aggregation capability On the other hand, in the packet domain network planning, a unique GGSN is allocated in a packet domain, and all UEs in the packet domain that access an APN supporting multi-link aggregation function are responsible for accessing the APN by the GGSN. In this way, the SGSN in the packet domain obtains all the PDP Context establishment requests initiated by the UE after successfully completing the GPRS attachment of the UE with the multi-link aggregation capability, and obtains the above-mentioned unique responsibility corresponding to the APN according to the APN accessed by the SGSN. Multi-link aggregation and access to the address of the GGSN of the APN, so as to ensure that all UEs in the packet domain that access the APN supporting the multi-link aggregation function establish a PLMN bearer channel with the GGSN.

Although FIG. 5 and FIG. 7 only show a multi-link aggregation signaling procedure for adding a new PLM bearer channel for increasing bandwidth, combining the present invention with the prior art signaling flow may be To complete the operation of deleting the existing PLMN bearer channel by reducing the bandwidth, or modifying the attributes (such as bandwidth) of the PLMN bearer channel. In addition, in the foregoing multi-link aggregation operation, the multi-link may adopt a static configuration method, that is, the corresponding link establishment operation is started after the UE is powered on, but in order to make full use of the radio resources, preferably, The link adopts a dynamic control method. At this time, the user equipment supporting the multi-link aggregation function is preferably responsible for the following intelligent processing:

■ Performing statistics on the average traffic of the uplink and the downlink, where the average uplink and downlink traffic refers to the time average of the data traffic sent (or received) by the UE in the uplink (or downlink) direction for a period of time;

■ Monitor uplink and downlink utilization, where uplink and downlink utilization is the ratio of the average uplink-downlink traffic to the current total link bandwidth, and compares the link utilization with the predetermined threshold to increase or decrease the link bandwidth. decision;

■ According to the hardware configuration of the wireless modem pool, when it is necessary to activate or deactivate the modem to increase or decrease the link bandwidth, make a selection of the modem that needs to be activated or deactivated. For the activation, the corresponding PL匪 bearer channel should be determined. Properties (such as maximum rate, etc.).

Claims

Rights request

A wireless communication system, comprising:

Client device

a wireless access network linked to the client device over an air interface (Uu);

GPRS packet data network;

External packet data network;

The GPRS packet data network includes a serving GPRS support node (SGSN) and a gateway GPRS support node (GGSN);

It is characterized by:

The user terminal device supports multi-link aggregation, and

The gateway GPRS support node supports multi-link aggregation.

2. The wireless communication system according to claim 1, wherein the user equipment comprises: a wireless modem pool portion;

Link control unit; and

Application Part;

It is characterized by:

The wireless modem pool includes a plurality of wireless modems, each of which has a different international mobile subscriber identity, and independently performs the function of the air interface of the user equipment side;

The link control unit performs aggregation processing on links corresponding to the respective wireless modems, and performs link management and control.

3. The system of claim 2, wherein:

Each of the plurality of wireless modems respectively establishes an independent PLMN bearer channel by using a packet data protocol context activation;

The link control unit performs multi-link aggregation on the PLM bearer channel corresponding to each wireless modem that is based on the multi-link point-to-point protocol ML-PPP at the user end;

The gateway GPRS support node aggregates the PLMN bearer channels corresponding to the respective wireless modems into one logical link on the network side based on the ML-PPP.

4. The system of claim 2, wherein:

The link control unit corresponds to each ML-PPP-based wireless modem at the user end The PLMN bearer channel performs multi-link aggregation;

The gateway GPRS support node forwards the PPP packet on the link corresponding to each wireless modem to the ISP/Intrannet access point;

The ISP/Intrannet aggregates the links corresponding to each wireless modem into one logical link.

5. A method of transmitting data in a wireless communication system, wherein the wireless communication system comprises: a client device; a radio access network linked to the client device over an air interface (Uu); a GPRS packet data network; An external packet data network; wherein the GPRS packet data network includes a Serving GPRS Support Node (SGSN) and a Gateway GPRS Support Node (GGSN); the user terminal device includes a wireless Modem pool portion composed of at least a first and a second wireless Modem And a link control unit, and an application part; and the gateway GPRS support node supports multi-link aggregation; the method comprises the steps of:

(a) the first wireless modem establishes a first PLMN bearer channel by a packet data protocol context activation process;

(b) the second wireless modem establishes a second PLM bearer channel by using a packet data protocol context activation process;

(c) concentrating the first and second PLMN bearer channels into one ML-PPP logical link;

(d) transmitting data on the logical link.

6. The method of claim 5, wherein step) further comprises:

Sending, by the first wireless modem, an activation packet data protocol context request message to a serving GPRS support node to which it is attached;

Sending a packet data protocol context request message to the gateway GPRS support node by the serving GPRS support node;

The gateway GPRS support node sends a create packet data protocol context response message to the serving GPRS support node;

The serving GPRS support node communicates with the radio access network to establish a corresponding radio access bearer;

The serving GPRS support node sends an activation packet data protocol context activation accept message to the first wireless modem;

The first wireless Modem indicates to the ML-PPP entity in the user equipment that the PLMN bearer channel is successfully established.

7. The method of claim 5, wherein step (b) further comprises:

Sending, by the second wireless modem, an activation packet data protocol context request message to a serving GPRS support node to which it is attached;

The serving GPRS support node sends an activation packet data protocol context activation accept message to the second wireless modem;

The second wireless modem indicates to the L-PPP entity in the user equipment that the PLMN bearer channel is successfully established.

8. The method according to claim 7, wherein the case where the packet data protocol address included in the activating packet data protocol context request message is allocated for a static IP address, that is, an IP address allocated by the client device; The case of address allocation is the IP address assigned in step (a).

9. The method of claim 7, wherein for the IP non-transparent transmission mode, the Activate Packet Data Protocol Context Request message does not include an IE option "Protocol Conf i Opportion Opt ions".

10. The method according to claim 5, wherein the method of the IP transparent transmission and the IP non-transparent mode and the PPP termination mode, wherein the step (c) further comprises:

(al) the first wireless modem uses the PPP link control protocol to initiate establishment of a basic PPP link on the PLMN bearer channel established by the ML-PPP entity in the gateway GPRS support node;

(a2) the second wireless modem uses the PPP link control protocol to initiate establishment of another PPP link on the PLMN bearer channel established by the ML-PPP entity in the gateway GPRS support node;

(a3) The second wireless modem aggregates the basic PPP link and the another PPP link into an ML-PPP link bundle by using a PPP link control protocol.

11. The method according to claim 10, for the PPP termination mode, in step (a2), the link control protocol no longer carries the corresponding ISP/Intranet authentication option when establishing the PPP link. The PPP network control protocol is no longer running.

The method according to claim 10, wherein the link control protocol option "Endpoint Discriminator" in the ML-PPP performs endpoint authentication using a combination of an access point and an IP address of the client device.

13. The method according to claim 5, wherein for the PPP relay mode, step (c) further comprises:

(bl) the first wireless modem uses the PPP link control protocol to initiate establishment of a basic PPP link on the bearer channel where the ML-PPP entity in the ISP/intranet access point is located;

(b2) the second wireless modem uses the PPP link control protocol to initiate an ML-PPP entity in the ISP/intranet access point to establish another PPP link on the bearer channel in which it is located;

(b3) The second wireless modem aggregates the basic PPP link and the another PPP link into an ML-PPP link bundle by using a PPP link control protocol.

14. The method according to claim 13, wherein in step (b2), when the PPP link is established, the link control protocol no longer carries the corresponding ISP/Intranet authentication option, and the PPP network control protocol is no longer running.

15. The method according to claim 13, wherein the link control protocol option "Endpoint Discriminator" in the ML-PPP uses the IP address of the client device for endpoint authentication.

16. The method according to claim 5, wherein before step (a), further comprising the step of: transmitting, by the client device, an "Attach Request" message to a Serving GPRS Support Node (SGSN), characterized in that

The IE "MS network capabi ty" of the message contains an additional bit value for indicating to the attached serving GPRS support node whether the client device has multi-link aggregation capabilities.

17. The method of claim 5, wherein the wireless communication system assigns a unique one of a Gateway GPRS Support Node (GGSN) within a packet domain, and all of the access zones support access to an access point for multi-link aggregation function The client device is responsible for accessing the access point by the gateway GPRS support node, and is characterized in that

After the GPRS GPRS support node in the packet domain successfully completes the GPRS attachment of the client equipment with multi-link aggregation capability, all PDP Context establishment requests initiated by the user equipment are based on accesses accessed by the user equipment. Point to obtain the above-mentioned only corresponding to the access point One is responsible for multi-link aggregation and accessing the address of the gateway GPRS support node of the access point, thereby ensuring that all the user equipments in the packet domain that access the access point supporting the multi-link aggregation function and the gateway GPRS support A PLMN bearer channel is established between the nodes.

The method according to any one of claims 5 to 17, wherein in the data transmission process, the user equipment performs the following operations:

Performing statistics on the average traffic of the uplink and the downlink, where the average uplink and downlink traffic refers to the time average of the data transmission (or receiving) of the user equipment in the uplink (or downlink) direction for a period of time;

Monitor uplink and downlink utilization, where uplink and downlink utilization is the ratio of the uplink and downlink average traffic to the current total link bandwidth, and compares the link utilization with the predetermined threshold to increase or decrease the link bandwidth. Decide

According to the hardware configuration of the wireless modem pool, when the modem needs to be activated or deactivated to increase or decrease the link bandwidth, the selection of the modem to be activated or deactivated is made, and the attribute of the corresponding PLMN bearer channel should be determined for the activation ( Such as maximum rate, etc.).