DE10123851A1 - Wireless data transmission between stations of e.g. UMTS system, employs channels or connections on the network side also, for transmission to and from devices - Google Patents

Abstract

The data on the network side is also transmitted over various channels or connections, from and to further devices on that side. An Independent claim is included for corresponding equipment.

Description

The invention relates to a method for data transfer communication over air interface channels systems with the generic features of the patent claim 1 or a device for performing such Process.

In radio communication systems, such as the GSM (Global System for Mobil Communication) or the UMTS (Uni Versal Mobil Telecommunication System) information, for example voice, image information or other data, with the help of electromagnetic waves over a radio Interface between sending and receiving station ü transferred. The communicating via the radio interface Stations are mostly a mobile subscriber station and one grid-side, stationary station. Lei the network side station Tends data to and from other network facilities where for the network-side facilities according to the communication cation system are formed.

For special telecommunications services, for example Spra che in AMR coding (AMR: Adaptive Multi-Rate), continues the data stream to be exchanged between the stations, composed of bits of different importance. Often lies the individual bits of data in the station from which they are to be sent via the air interface already after Priority ordered. For the transfer at a sol Chen service on the air interface at for example UTRAN (UMTS Terrestrial Radio Access Network) between one mobile subscriber station and a network-side base station separate channels are set up for the different bit classes. It is also known that different for the different bit classes  Use protective mechanisms (UEP: Unequal Error Protection). This allows the air interface to go visibly optimized bandwidth.

For example, in the case of AMR-coded speech, 3 bits are transmitted via a UMTS air interface for one bit of the most important bit classes (Class A Bit), a 1/3 coding being used, while for a bit of a medium-important bit class ( B bit), two bits are tion (1/2 Kodie transmitted) and a bit of the lowest bit class (class C bits) is transmitted, only the data bits itself without redundancy (1/1 -encoding).

On the network side, the three different channels of air interface for the terrestrial part into one summarized physical channel. Thereby become the network sided forwarding procedure z. Bs. In UMTS according to ATM AAL2 (ATM adaptation layer no. 2) or circuit-switched procedures used. This enables the use in particular standardized and existing network facilities and network ver drive for connection-related voice transmission.

For voice transmission through networks, their transport on based on the internet protocol (IP) and the connection construction signaling protocols such. B. The Session Initia tion protocol (SIP), a data stream from one Terminal to another terminal generated by the network element is no longer analyzed.

Disadvantageously, the data can currently be sent are not specially prepared on the air interface and must be on the network side and on the air interface in one Channel are transmitted. This means there is no bandwidth optimized transmission via the air interface possible.

The object of the invention is to provide a method or a device for simplified and efficient data transmission  propose between two stations if the over transmission both via an air interface and via a packet-switching network should take place.

This task is accomplished through a method of data transmission between several stations with the features of the patent claim 1 or a device for performing this Ver drive with the features of claim 10 solved.

Advantageous configurations are the subject of dependent Claims.

A particularly advantageous implementation of data transmission over air interface channels of a communication system, at different according to the data of a single service Allocation criteria in different channels or connections conditions are transmitted via the air interface in that the data also or already on the network side in this way split be transmitted. Allocation criterion for the Distribution over different connections or channels can be there with an existing distribution of different partial data flows within the data. Prioritization ver different data stream components can be used as a criterion become. For voice services, the data can be according to the Classification z. B. according to the AMR coding method be shared.

The packet-switched transmission of data over the air Interface is advantageously through an extension of the connections or channels via the air interface effected in the network-side facilities. It can on the network side in particular a single physical channel can be used with several logical connection channels. The extension is advantageously carried out by air interface and the network up to a subscriber side Data terminal device or station as another terminal device out.  

The disassembly and / or coding of advantageously takes place Accordingly, data is not in a network facility near the Radio interface but only in the subscriber side station before transmission via the air interface and accordingly, data transmitted on the network side only after the transfer in another corresponding participant end station decoded or assembled.

This advantageously also enables the provision of Data according to the Internet protocol in the subscriber side Station or the receipt of such data in such a part station on the customer side across the air interfaces. Furthermore, the application is also in such a method an error correction for packet switched data before Send via the air interface or after receipt via the air interface in the station on the subscriber side enables so that the network-side facilities ideally only forwarding without data processing have to make. only the air is here Interface-related implementation necessary, d. H. Kanalkodie tion.

Coordinating and / or synchronizing the individual parts In particular, data streams on several connection channels are possible especially in the network side, but also expediently in the end stations and transport facilities a Ü transmission of the individual partial data streams via different Connecting channels in a way that a later Decoding and composition in the receiving data terminal set up easily and within tolerable time enables offset. Coordination is advantageous of the partial data streams etc. which result in a session Listen.

A prioritization of the data packets is also advantageous te possible so that data of important services via partial data streams  or connection channels with a high priority faster or safer than less important partial data be forwarded. This can alternatively or in combination with appropriate coordination and synchronization of partial data streams in the network.

In addition to corresponding adjustments to the functionality in the network side facilities will suitably a correspond Chen control device in the data terminals, esp special subscriber stations, provided for processing prepare the data obtained there according to one of the above given procedure is formed. In the simplest case it can an existing control device with an additional one Functionality set up by appropriate programming be tested.

An embodiment is shown below with reference to the drawing explained in more detail. It shows:

Fig. 1 shows schematically various facilities of a radio communication system and logical connections in various process steps in connection with the establishment of a data transmission connection via an air interface.

As can be seen from Fig. 1, the exemplary Darge communication system consists of a plurality of Netzein devices that have a base station B, which is also referred to as UMTS B for example, and via an air interface V with at least one subscriber-side stati on UE communicate. The subscriber-side station UE, also referred to as user equipment in UMTS, can be, for example, a cellular telephone or a stationary or mobile computer or host. The station on the subscriber side has a multitude of devices and functions for controlling the data transmission via the radio interface V. These are in particular a session initiation protocol SIP (Session Initiation Protocol), a function for a session management SM (Session Management), a control device and control functions for the radio resources RRC (Radio Research Control) and an application module for the provision and execution of application-related functions.

Netzsei is used to set up the actual radio interface tig the network station B, which in turn with a network side Control device for the radio network RNC (Radio Network Control) is connected. The control device for the radio network, of which several can be used in a radio network if required directions can be provided, which also for the usual facilities applies, in turn has a variety of Facilities and functions. These include in particular a control device for the radio resource RRC for the com communication with the corresponding control device of the part user-side stations UE and a facility and function for RANAP (Radio Access Network Application Part). The latter are used for appropriate communication and function control with another device that as serving GPRS support node SGSN (serving GPRS Support node) with a corresponding sub-device serves. The SGSN in particular also has a function for the Session management SM on. The SGSN is among others a gateway GPRS support node GGSN (gateway GPRS Support Node), which is also a function for the session management has SM. The GGSN points out on the one hand a connection to a medium access gateway MGW (Media GateWay) via a collaboration module (Inter Wor king) access to other communication systems at for example, has a fixed network PSTN. The GGSN further points out a connection to a device with a call status control function CSCF (Call State Control Function), where functions are provided that meet the requirements changes to the SIP session initiation protocol are sufficient.  

In a known way, at the beginning the establishment of a connection via the radio interface V to later data exchange initiates a service negotiation (Service negotiation) according to the session initiation protocol SIP made. The service negotiation takes place between the subscriber station UE and the call status Control function CSCF instead, the exchange via a Ka nal on the radio interface V and the various in between lying network equipment takes place. At the services Negotiation can, for example, request a service the one in which a part of the data as voice data according to the Subscriber data protocol udp (user data protocol) with Zu aisle number (port) p1 with adaptive multi-rate coding another part of the quality class A is sent Data with the next worse quality class is transmitted and the last data portion as data according to the subscriber da tenprotokoll with access number p5 with the adaptive Multi rate coding class C is transmitted. With other wor th the data of a single service z. B. by an AMR coding split and the individual data parts weighted or prioritized.

After the relevant requirements between the part subscriber-side station UE and the call state control function CSCF negotiated in the first step follows in ei nem second step the request for a service with a generic quality of service QoS (Quality of service). In the present example, the is to be transferred data stream that has data that differs from the three which quality of service or AMR bit classes are assigned. Ent speaking the requirements according to the session management radio tion SM become several, here three radio access bearers on the network side ger RAB (Radio Access Bearer) between the control device negotiated for the RNC radio network and the SGSN. this happens in a third process step involving the Devices and functions for RANAP radio network access.  

In a manner known per se, the following is carried out in one fourth step a radio interface for the required data service provided, in the present Case three different channels on the radio interface be would be provided. These three channels would be removed speaking the data bits of a particular one of the three quality of service assigned what a corresponding data conversion for the Requires transmission via the radio interface, d. H. especially the channel coding listed above. network the three data streams are forwarded via now also three channels provided in the network. This can be used for terrestrial or network transmission according to the internet protocol IP optionally in a single logi session with three physical channels to get nabbed. A conversion of the radio interface le data received on the network side into a single data stream is advantageously no longer absolutely necessary and Not possible according to today's standards. With a transfer in the opposite direction, data is according to the Internet prototype koll IP is already transmitted on the network side as three data streams and handed over to the radio interface.

To avoid such a bandwidth-consuming Ver connection between radio interface and network devices who the thus in the present embodiment several spe zial transmission channels via the radio interface and that Network requested and set up. There are none or only ge minor adjustments compared to previous standards described functions and procedural steps required.

Instead of the data via the radio interface in a separate NEN format and then over the other communication tion network converted to forward packet-switched the data advantageously already on the subscriber side Gen station are provided so that they already transmitted via the air interface V packet-switched that can, in particular the conditions of the Internet protocol  IP is sufficient. This means direct services from one End point to the other end point (end-to-end services) via pa chain-switched networks possible. Advantageously, the da only at the two ends, usually terminals or subscriber stations UE, unpacked and edited become.

In the conventional method, i.e. H. the entire voice data are transmitted in an IP connection is on the air interface the possibility of unequal error protection UEP (Unequal Error Protection) not available. At AMR Coded speech requires more than twice the bandwidth tigt, since all data with the highest redundancy, z. B. double redundancy must be transferred.

In the method described here, one type is also more unequal Error protection UEP possible on the air interface, what with a corresponding bandwidth saving is connected because not all data is transmitted with the highest redundancy have to. For this, the data stream is already from the terminal, here ie the subscriber station UE in the individual part data streams, if the data is not already in such partial data streams exist. This single data currents are then from the subscriber station UE over the air interface V and through the network to to the mutual terminal, e.g. B. another participant side station UE, transmitted in separate data streams. First a corresponding application program in the other endge advises bringing the partial data streams back together. To increase bandwidth efficiency can be achieved with such a method additionally also compression methods for the head section (Header) for the individual connections between the UTRAN and the station can be used.

During network construction and transmission procedures using the example of UMTS are shown, a transmission is also on be any other communication networks, especially cellular networks,  and possible for a wide variety of services, the Da streams from different bit classes or according to others Criteria are composed.

In the present embodiment, in one subscriber-side station UE existing data or data streams in partial data streams of different bit classes tert rushes. This is preferably done on the application or application level. In the signaling at Service negotiation on e.g. B. the session introduction photo koll SIP between the affected stations and the network already have the required channels for the partial data streams calls. The transport network is built by the association preferably based on the previous procedures. On particular advantage is that this transport network Is independent of service. New encodings of all kinds Type for example sound or image transmission can thus be easily introduced.

Functions and facilities are preferred introduced that ensure the quality of services is guaranteed by the in the network and in the stations Partial data streams are transmitted or processed synchronously become.

While the establishment of a connection from one subscriber station is described from, can such establishment of a connection also from a network side Station initiated when from or through this corresponding data to the subscriber station UE ge should be delivered. Such a case is conceivable if the remote station that originally requested a connection changes data to the network only using a conventional method can pass, with a network station near this remote subscriber-side station in accordance with the received data corresponding partial data streams, which correspond to the one here described methods over the radio interface V to  the subscriber-side station UE on this side and only be processed accordingly in this.

In the embodiment shown in Fig. 1 are in the first step via a session control signaling, UMTS using SIP, a requested service and the coding to be used or with AMR the coding modes to be used with the necessary trans port channels between the terminals and the intermediate control node in the network, here the call status control function CSCF, negotiated. At the respective protocol levels (IP: Internet protocol, UDP: User Data Protocol, RTP: Real Time Protocol (real-time protocol)), corresponding partial data channels are requested for each permitted AMR mode.

The station on the subscriber side then contacts UE or the terminal is the access node to the transport network, here the SGSN, and in the present example requires three connections with corresponding bandwidths and bit error rates SW, which the corresponding service requirements of the service negotiation (Service Negotiation). The SGSN builds this ver binding towards the core network, here the GGSN and the network Access device in the control device for the RNC radio network. The SGSN also initiates the Structure of the radio bearer on the subscriber side Station UE via the radio interface V. For connections to Fixed network stations (PSTN terminals) will connect via the GGSN to the media gateway and above to the foreign one Fixed network PSTN established. Between the respective end stations or terminals and network stations are pro negotiated AMR mode own, in the present example preferably two or three channels. Thereby can run the entire distance from the subscriber side Station UE to the last station that un this method supported, or in the opposite direction independent part streams are transmitted. The provision of these partial data streams  or the processing of these partial data streams takes place each in the end stations. This preferential as appropriate encoders or decoders.

To be sufficient in the case of in particular real-time data To allow synchronized transmission are in single Functions of the transport network provides a time coordination of each arrange related data streams. In particular, should avoid time delays in the partial data streams that will. If such delays do not ver are avoidable, the time delays should be for everyone related partial data streams are as similar as possible len. Expediently during handover between control devices for the radio network RNC or zwi all partial data streams are redirected simultaneously. to Coordinating the transport of data from different parts For example, currents can be flagged accordingly. or signaling in the partial data streams or data packets th of the individual partial data streams are provided by means of which an assignment is possible. Another example the provision would be for a coordinated transmission several data channels, each of which must have the same Stations are led and marked as belonging together are not. The latter would particularly be the case with a transmission over the Internet prevent the individual partial data currents are conducted in completely different ways.

Each partial data stream is expediently considered to be its own Transfer IP / UDP / RTP connection. For transportation in the UMTS-po domains are then only minor changes in functionality nality required.

Claims (10)

1. A method for data transmission via air interface channels between a first station (UE) and a network-side station (B) of a packet-switching communication system (UMTS), in which data from a single service corresponds to different allocation criteria in different channels or connections via the air interface (V) are transmitted, characterized in that the data are also transmitted on the network side from / to other network-side devices in different channels or connections. 2. The method according to claim 1, wherein data of different partial data streams as allocation criterion, Data streams, priorities and / or language content shares of the Service. 3. The method according to claim 1 or 2, in which one or more of the connections or channels via the air interface (V) can be extended on the network side. 4. The method according to claim 3, wherein the multiple connections or channels for partial data streams on the network side as a single physical channel or one single session can be managed. 5. The method according to any preceding claim, in which
a plurality of data to be transmitted via the air interface (V) to be transmitted in the first station (UE) for transmission over a plurality of connection channels and / or coded or in the first station (UE) via the air interface (V) a plurality of connection channels received data are put together and / or decoded in this first station (UE) and
only at a remote end station is the corresponding reverse processing carried out. 6. The method according to any one of the preceding claims, in which Data to be sent via the air interface (V) as IP Data is provided and transferred. 7. The method according to any one of the preceding claims, in which on data to be sent over the air interface channels before sending or after receiving in the first, part own station for each channel or connection Error corrections can be applied. 8. The method according to any one of the preceding claims, in which Partial data streams on several connection channels in the network side gene and / or end stations (UE) and transport facility tions (B, RNC, SGSN, GGSN, MGW) coordinated and / or syn be chronized. 9. The method according to any one of the preceding claims, in which via the air interface channels and network-side facilities gene (B, RNC, SGSN, GGSN, MGW) to be transmitted in part data streams of different priority are separated. 10. Device in a station or device of a packet-switching communication system (UMTS) with an air interface (V) between at least a first station (UE) and a network-side station (B), with data from a single service corresponding to different assignment criteria in different channels or connections are transmitted via the air interface (V) and
the device having at least one control device for managing and processing the data to be transmitted,
characterized,
that the control device is also designed for network-side transmission of the data in different channels or connections according to a method according to one of the preceding claims.