JP4790438B2 - Packet multiplex transmission method - Google Patents

Description

  The present invention relates to a packet multiplex transmission method for performing a plurality of connection destinations and a plurality of QoS transmissions in a mobile communication system.

  The third generation mobile communication system can simultaneously transmit a plurality of multimedia data flows having various QoS characteristics on the same radio. Specifically, it is possible to multiplex and transmit data that requires real-time performance such as VoIP and non-real-time data such as browsing using TCP with appropriate quality.

  When separating the QoS characteristics of multimedia data, each flow is defined as a radio access bearer (hereinafter referred to as RAB). The purpose of defining RAB is to assign an identifier for logically separating flows and to instruct the lower layer of the QoS characteristics to be applied to the flow. Specific QoS characteristics include minimum guaranteed throughput, allowable delay time, allowable error rate, and the like.

  Here, the QoS control is actually performed by a lower layer having retransmission, error correction, and priority transmission functions. These lower layers are collectively referred to as a radio bearer (hereinafter referred to as RB), and RAB and RB Are in a one-to-one relationship. At the RB level, QoS control is realized by appropriately setting various wireless transmission parameters (such as the number of retransmissions, encoding, priority transmission order, etc.) according to the QoS characteristics instructed by the RAB.

  Although the above has been described from the viewpoint of one IP connection destination, in the third generation mobile communication system, a plurality of IP connections can be simultaneously established. As a specific use, it is possible to connect to another ISP and receive mail service while connecting to a company LAN and accessing a database.

  In this way, the simultaneous connection to a plurality of connection destinations can also be realized by logically separating the flows using the RAB described above. Furthermore, RABs can be separated for each connection destination in order to support multiple QoSs.

  As described above, RAB / RB can be separated according to each connection destination and the QoS characteristics in it, and appropriate QoS control can be implemented respectively, but RAB to be managed every time connection destination and QoS are separated There is a problem that / RB increases.

  As described above, if any differentiation is desired at the RB level, it is necessary to separate the RAB and set the QoS characteristics regardless of the difference in the QoS characteristics. Also, if the connection destinations are different, it is necessary to separate the RAB in order to logically separate the flows, so the RB is separated even if the QoS characteristics to be specified are exactly the same among multiple connection destinations. Will be.

  As the number of RAB / RBs to be managed increases, the information to be held on the terminal and NW side increases, and the number of control signaling increases, so it is desirable to suppress the number as much as possible.

A packet multiplex transmission method according to an embodiment includes:
A packet multiplex transmission method used in a mobile communication system having an exchange connected to a connection destination via an external network and a radio access network connected to the exchange and communicating with the mobile ,
The exchange is each and every QoS characteristics destination to a radio access bearer (RAB) separating the radio access bearer by imparting RAB identifier, that identifies a priority to each packet to separate radio access bearer grant Priority identifier,
The radio access network uses a table that defines a correspondence relationship between the RAB identifier , the priority identifier, and a radio bearer (RB) , and sets a radio bearer to be used for communication with a specific mobile device for each packet . step selected, performs QoS multiplexing transmission
And the table is
When the QoS characteristics indicated by the RAB identifiers of a plurality of connection destination radio access bearers are the same, associate the plurality of connection destination radio access bearers with the same radio bearer,
This is a packet multiplex transmission method in which, when priority identifiers assigned to a plurality of packets of a single connection-destination radio access bearer are different, the plurality of packets are associated with a plurality of radio bearers.

  According to the present invention, it is possible to perform multiplex transmission considering QoS without finely separating RAB and RB for each of a plurality of connection destinations and QoS. This makes it possible to reduce the logical flow state to be managed and the signaling.

  Examples of the present invention are shown below.

  FIG. 1 shows a configuration example of a mobile communication system in the embodiment of the present invention. Reference numeral 101 denotes a mobile station, which terminates all layers from the physical layer to the application layer. It also has call connection functions such as outgoing / incoming calls and handovers. In addition, it has a function to demultiplex and multiplex a plurality of RABs and a plurality of RBs according to a plurality of connection destinations and QoS.

  Reference numeral 102 denotes a NodeB (base station), which mainly has interface functions such as a physical layer and a data link layer on the mobile station side, and relays wired and wireless protocols.

  Reference numeral 103 denotes an RNC (Radio Control Station), which has call connection functions such as outgoing / incoming calls and handovers. In addition, it has a function to demultiplex and multiplex a plurality of RABs and a plurality of RBs according to a plurality of connection destinations and QoS.

  Reference numeral 104 denotes a RAN (Radio Access Network), which means the entire radio-related functional unit including RNC and NodeB. In this figure, an example in which RNC and NodeB are separated is shown, but this embodiment can be applied even if they are physically integrated. In the following description of the present embodiment, the RAN function will be described unless otherwise specified.

  Reference numeral 105 denotes a GSN (packet switch), which is located at the boundary with an external network such as an ISP. The mobile device has a function of assigning an IP address according to each connection destination, and a function of separating flows according to the connection destination and QoS.

  Reference numeral 106 denotes an ISP (Internet Service Provider), which indicates an external network connected to the mobile communication system. Although ISP is described here, the same applies to direct connection to a corporate LAN.

  FIG. 2 shows RAB and RB in the embodiment of the present invention. RAB (Radio Access Bearer) indicates a logical flow connection between the mobile station, RAN, and GSN. In addition, the QoS characteristics to be guaranteed are instructed to the lower layer (RB here). RB (Radio Bearer) indicates a radio interface between the mobile station and the RAN.

  This flow shows an image of establishing a logical connection in consideration of QoS among UE, RAN, and GSN. When establishing a connection between the UE and the GSN, RAB is first defined for each connection destination or QoS to be separated (203). At the same time, the QoS profile of the corresponding RAB is designated for the lower layer (204). The optimum RB parameter is determined according to the QoS profile (205), and information on the determined RB is notified to the UE (206).

  FIG. 3 shows a method for separating the logical flow and the QoS flow in the embodiment of the present invention. Here, downlink transmission is described as an example, but the same applies to uplink transmission.

  First, the GSN separates the RAB when there are a plurality of connection destinations (ISPs) and when a different QoS profile is designated as the RB among the same connection destinations (301). Separation of logical flows by RAB can guarantee flow independence and QoS independence. Next, an identifier (Q-ID) is assigned to the separated RAB in a packet-by-packet (302). This is assigned when the QoS characteristics such as delay characteristics are the same, so that the RABs are classified into the same RAB, but priorities at the time of transmission are desired to be differentiated.

  The RAN that receives the data from the GSN distributes the packet data to the corresponding RB in accordance with the RAB identification and QoS identification (303). The RAN has a sorting table (304), which can be sorted arbitrarily. This table can be fixedly set in advance or dynamically changed when the RAB is specified.

  FIG. 4 illustrates a mapping example of RAB and RB in the embodiment of the present invention and the effect thereof. The following settings are possible depending on the number of connection destinations and the QoS to be supported.

  Example 1 shows an example in which each RAB of a plurality of connection destinations is mapped to the same RB. This is effective when the same QoS characteristic is supported for a plurality of connection destinations. In the prior art, since it is necessary to define RBs for each connection destination RAB, the number of RBs increases. However, since the RBs are the same in this embodiment, setting of a new RB is unnecessary. In this case, even if the RB is the same, the RAB is separated, so that the independence of the flow can be maintained.

  Example 2 shows an example in which the same RAB at a single connection destination is mapped to multiple RBs. This is effective when each data in the RAB has the same QoS characteristics such as delay characteristics and the like, and therefore it is not necessary to distinguish the RAB. Since RAB is not partitioned, signaling for separating logical flows is not necessary.

  In Example 3, Example 1 and Example 2 are combined. As shown in the figure, RAB and RB can be arbitrarily combined by setting the sorting table. In the case of the prior art, four RABs and RBs are required, but in the present invention, it is possible to reduce the number of RABs to two and RBs to three. This reduces the number of lines to be managed and the number of times of RAB and RB addition / deletion.

It is a figure which shows the structural example of the mobile communication system in a present Example. It is a figure which shows RAB and RB in a present Example. It is a figure which shows the logical flow and QoS flow separation method in a present Example. It is a figure which shows the example of a mapping of RAB and RB in a present Example.

Explanation of symbols

RAB radio access bearer RB radio bearer

Claims (3)

A packet multiplex transmission method used in a mobile communication system having an exchange connected to a connection destination via an external network and a radio access network connected to the exchange and communicating with the mobile ,
The exchange is each and every QoS characteristics destination to a radio access bearer (RAB) separating the radio access bearer by imparting RAB identifier, that identifies a priority to each packet to separate radio access bearer grant Priority identifier,
The radio access network uses a table that defines a correspondence relationship between the RAB identifier , the priority identifier, and a radio bearer (RB) , and sets a radio bearer to be used for communication with a specific mobile device for each packet . step selected, performs QoS multiplexing transmission
And the table is
When the QoS characteristics indicated by the RAB identifiers of a plurality of connection destination radio access bearers are the same, associate the plurality of connection destination radio access bearers with the same radio bearer,
A packet multiplex transmission method for associating a plurality of packets with a plurality of radio bearers when priority identifiers assigned to a plurality of packets of a single connection destination radio access bearer are different . 2. The packet multiplex transmission method according to claim 1 , wherein all of the correspondence relationships of the table are fixedly set in advance. The correspondence relation of the table is set up sequentially in response to the QoS characteristics specified when the radio access bearer, a packet multiplexing transmission method according to claim 1.

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