WO2001033779A1 - Voice packets in ip network - Google Patents
Voice packets in ip network Download PDFInfo
- Publication number
- WO2001033779A1 WO2001033779A1 PCT/SE2000/002089 SE0002089W WO0133779A1 WO 2001033779 A1 WO2001033779 A1 WO 2001033779A1 SE 0002089 W SE0002089 W SE 0002089W WO 0133779 A1 WO0133779 A1 WO 0133779A1
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- WIPO (PCT)
- Prior art keywords
- network
- destination
- source
- centre
- voice packets
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
- H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
- H04Q11/0478—Provisions for broadband connections
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4604—LAN interconnection over a backbone network, e.g. Internet, Frame Relay
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5603—Access techniques
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5638—Services, e.g. multimedia, GOS, QOS
- H04L2012/5665—Interaction of ATM with other protocols
- H04L2012/5667—IP over ATM
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5638—Services, e.g. multimedia, GOS, QOS
- H04L2012/5671—Support of voice
Definitions
- the present invention relates to a signal format in an IP bearer used in a core network for transmission of user data.
- the invention also relates to a method and an arrangement to create said signal format.
- ATM asynchronous transfer mode networks
- video and voice transfer of information
- ATM networks use a packet switching technique.
- An ATM network is a connection-oriented network in which each transfer of data between network devices is preceded by an order to establish a virtual connection between the devices.
- connectionless data is transferred over the network from a source device to a destination device without first establishing a connection as is required in ATM networks.
- connectionless network data is transmitted by a source device with an address of the destination device and the connectionless network will route that data by any number of network paths to the desired destination device.
- a Universal Mobile Telecommunications Network UMTS architecture comprises access networks and a core network.
- ATM has been standardized as bearer for compressed voice.
- the Internet Protocol is used as core network.
- Mobiles in one access network have independent and simultaneous voice calls to mobiles in another access network.
- the two access networks are connected to the IP core network and compressed voice packets are issued e.g. every 10 ms .
- the IP-based core network provides connectionless end-to-end service by means of routing in each traversed node.
- the IP format comprises a header and a payload and comes in two versions, namely IPv4, well known and established on the market today, and Ipv6, newly developed and beginning to be introduced on the market.
- An Ipv4 packet will have a header of 28 octets and an I ⁇ v6 packet will have a combined header of 52 octets.
- the header-payload ratio between the average voice packet of 6 octets in the payload will become very unbalanced.
- the figures are 28 to 6.
- Ipv ⁇ the figures are 52 to 6. This unbalanced ratio will lead to bandwidth waste.
- the present invention solves the problem with unbalanced ratio between header and payload in an IP packet when information is transferred between access networks of ATM- type, via a core network of IP-type.
- the problem is solved by the invention by arranging multiple voice packets, having the same destination address, in the payload part of the IP packet.
- voice packets from an ATM voice bearer having the same access destination network addresses, are gathered in an access source network and arranged into the payload part of an IP bearer in a core network.
- the IP bearer transports the packets to the destination access network address .
- packets are distributed to their final destination within the access destination network.
- the IP signal format includes:
- a payload comprising voice information
- the voice information includes multiple voice packets with the same destination address .
- the voice packets are arranged into the payload part from an ATM voice packet bearer.
- One object of the present invention is to increase the bandwidth when transmitting voice packets in an IP core network between two access networks of ATM-type.
- Another object is to enhance the overall voice quality by leaving voice packets untouched from source to destination access networks, even though a core network of different type has to be passed.
- An advantage with the invention is the bandwidth saving that can be made in the core network .
- Another advantage is that the packet format used in the source and destination access networks can be kept during the transport in the core network .
- Figure 1 is a perspective illustration of a telecommunication system having a source access network of ATM-type, a core network of IP-type and a destination access network of ATM-type.
- Figure 2a discloses an ATM signal format including ATM cells with a header part and a payload part.
- Figure 2b discloses an IP signal format including a header part and a payload part.
- Figure 3 is a block schematic illustration of a source and a destination centre, communicating via a core network CN.
- Figure 4 is a flow sheet illustrating a method to create the IP signal format.
- FIG. 5 is a block schematic illustration of a telecommunication system having a source access network of ATM-type, a core network of IP-type and several destinations access networks of ATM-type.
- FIG. 1 discloses a telecommunication system TS used for mobile communication .
- the telecommunication system includes a source access network SAN and a destination access network DANB, both of ATM-type (Asynchronous Transfer Mode) .
- the telecommunication system comprises a core network CN of IP- type (Internet Protocol) .
- the core network CN is used for transportation of user data such as voice packets VP between the source and the destination access networks SAN and DANB.
- the source access network SAN in figure 1 includes base transceiver stations bla, b2a and b3a communicating with mobile stations la, 2a, 3a, 4a and 5a.
- the communication between the base stations and the mobile stations constitute the radio interface.
- the radio interface in this embodiment is based on WCDMA (Wideband Code Division Multiple Access).
- the ATM-networks SAN and DANB are connection-oriented networks in which each transfer of data between network devices is preceded by an order to establish a virtual connection between the devices .
- the ATM networks in figure 1 are AAL2/ATM based access networks.
- AAL2 Adaption Layer 2 specifies ATM transport of connection-oriented circuit and high bit-rate packetized audio and video.
- the communication protocols in an ATM network are designed in a layered fashion with lower layer protocols providing services to the next higher layer.
- the physical layer is the lowest layer protocol, which provides access to the transmission medium, specifying details concerning physical interface signalling and timing.
- Data link layer protocols allow communication with the physical layer and provide link-by-link error detection/correction. Network layer protocols then take over by providing end-to-end addressing, flow control and integrity checking.
- the transport layer provides multiplexing onto the network.
- the session layer establishes a connection between systems.
- the presentation layer manipulates data into different forms for the highest layer, the application layer.
- the base stations bla, b2a and b3a in the source access network SAN are connected to ATM/AAL2 switches Sla and S2a .
- the first and second base station bla and b2a are connected to a first switch sla.
- the first switch sla and the third base station b3a are both connected to a second switch s2a.
- the switches direct voice packets through the access network via the established virtual connection.
- the second switch s2a is connected to a mobile switching centre MSCa in the source access network SAN.
- the mobile switching centre MSCa acts as a gateway to the IP-based core network CN.
- the destination access network DANB has the same configuration as the source access network SAN previously mentioned.
- the mobile stations lb, 2b, 3b, 4b and 5b communicate with base stations bib, b2b, and b3b via a WCDM A radio interface.
- the base stations in the destination access network DANB are connected to ATM/AAL2 switches Sib and S2b in the same manner as in the source access network SAN.
- the second switch in the destination access network is connected to a mobile switching centre MSCb which acts as a gateway to the IP-based core network CN.
- the IP-based core network CN is connectionless.
- data is transmitted by a source device, which in this case is the source centre MSCa in SAN.
- An IP data header comprises a destination device address i.e. the address to the destination centre MSCb in DANB.
- the connectionless network will re-route the data by any number of network paths to the desired destination device.
- the rerouting takes place in IP-routers IPR1-IPR3.
- the IP-routers verify an address specified in the header in a received IP- packet and re-route the packet to the correct destination.
- FIG 1 is shown a general outline how voice packets VP are transported from the first base station bla in the source access network SAN to the first base station bib in the destination network DANB via the IP routers IP1-IP3.
- FIG 2a The building up of ATM cells in the ATM access networks can be seen in figure 2a.
- the figure shows the basics of AAL2 packets multiplexed on ATM.
- ATM is connection oriented to its nature meaning that a connection must be established before any cell can be traversed.
- a connection in the source access network SAN is established between the first base station bla and the mobile switching centre MSCa.
- Compressed voice packets blal-bla5 from mobile stations communicating with the first base station bla is shown in figure 2.
- each voice packet blal-bla5 is provided with a header AAHD in which the destination address is specified. Only one header is shown in figure 2a . Voice packet and header together constitute an AAL2 packet.
- an ATM cell Before transportation in the ATM source access network SAN, an ATM cell is created.
- the ATM cells have a similar design as an AAL2 packet, with a header part ATMHD1 and ATMHD2 and a payload part ATMPL1 and ATMPL2, but unlike the AAL2 packet, the ATM cell has a fixed payload size.
- the payload size of an ATM cell is 48 octets, while the payload size in an AAL2 packet can vary from 1 to 64 octets.
- the first two voice packets blal and bla2 are arranged in its entirety into the payload part ATMPL1 of a first ATM cell ATMC1.
- Figure 3 discloses a block schematic illustration of the source centre MSCa communicating with the destination centre MSCb via the core network CN.
- the source centre MSCa comprises a multiplexer MUXa having outputs connected to "First In First Out" registers FIFO-b, FIFO-c and FIFO-d. Data sent to a first register FIFO-b belong to the destination centre MSCb, while data to the other two registers FIFO-c and FIFO-d belong to other destination centres which so far have not been discussed.
- Voice packets blal, b3al, b2al, bla2 and bla5 received from source units are received to the multiplexer MUXa and distributed to the registers FIFO-a, FOFO-b or FIFO-c in the source centre MSCa.
- a call centre CC in the source network SAN analyses requested set-up of calls and distributes call set-up data to an address analyser AA in the source centre MSCa .
- the address analyser AA is informed by the call centre CC of the specified destination for received voice packets.
- the address analyser is connected to the multiplexer MUXa and directs after connection establishment voice packets to the correct register FIFO-b, FIFO-c and FIFO-d.
- the transportation of the voice packets from the source network SAN to the destination network DANB takes place over an IP core network CN in the payload part IPPL in an IP packet IP.
- the destination centre MSCb is located in the destination network DANB and comprises a First-In-First-Out register FIFO to which voice packets from the first register FIFO-b is received.
- the register FIFO in the destination centre MSCb is connected to an input of a multiplexer MUXb in the centre .
- the multiplexer distribute voice packets to addressed destination units lb, 3b, 4b located in the destination network DANB. Voice packets in the payload part of one or more IP-packets with the same base station as destination, are arranged into an ATM cell in the destination network DANB. After establishment of a virtual connection in DANB specified in the voice packet header, the ATM cell is transported to the correct destination base station and voice packets are distributed to specified destination units .
- voice packets with the same destination address are gathered in the mobile switching centre MSCa and transferred to the payload part of an IP packet after a specified time period.
- FIG 2b the building up of an IP packet is shown. Compressed voice packets gathered in the mobile switching centre MSCa are transferred to the payload part IPPL of the IP packet IP.
- FIG 2b can be seen how the voice packets have been arranged in the IP packet.
- the voice packets having the same destination address, i.e. which all belong to the destination access network DANB have been arranged in the payload part of the IP packet.
- the voice packets blal, bla2 and bla5 arrive from the first base station, b3al from the third base station and b2al from the second base station.
- the telecommunication system used in the method is the system already shown in figure 1 and figure 3. References that already have been used in previous figures will also be used in the explanation of the method. The most essential steps of the method can be seen in figure 4.
- the method comprises the following step:
- a call is set-up from a user of the source unit la in the source network SAN to a user of destination unit lb in the destination network DANB
- the call set-up is analysed by the centre CC .
- the call centre send information to the address analyser AA in the source centre MSCa that voice packets received in the source centre from source unit la is to be sent to the destination centre MSCb in the destination network DANB.
- a first voice packet blal is sent over the air interface from the source unit la to the base station bla in the source network SAN.
- the voice packet blal is transported from the base station bla to the source centre MSCa in a payload part of an ATM cell.
- the ATM cell is transported through the ATM source access network SAN, via the switches Sla and S2a.
- a voice packet b3al with destination unit 2b is transported from the base station b3 to the source centre MSCa in an ATM cell .
- a voice packet b2al with destination unit 3b is transported from the base station b2 to the source centre MSCa in an ATM cell.
- Two voice packets bla2 and bla5 with destination units 4b and 5b are transported from base station bl to the source centre MSCa in one ATM cell . All voice packets are handled in the same manner as the previously mentioned first voice packet blal.
- the voice packets blal, b3al, b2al, bla2 and bla5 are received from the base stations bl, b2, b3 by the source centre MSCa .
- the address parts in the received voice packets are analysed by the address analyser AA.
- the address analyser AA influence the multiplexer in the source unit to switch over and transmit the received voice packet blal to the first register FIFO- b.
- the voice packets blal, b3al, b2al, blal and bla5 gathered in the first register FIFO-b are arranged into the payload part IPPL of the IP-packet IP.
- the IP-packet is re-routed from the source centre MSCa to the destination centre MSCb through the core network CN, via the IP-routers IPR1, IPR2 and IPR3.
- the IP-packet is received by the First- In-First-Out register FIFO in the destination centre MSCb.
- Each voice packet is analysed and the multiplexer MUXb in the destination centre MSCb is arranged to distribute the received voice packet to the specified destination units lb, 2b, 3b, 4b, 5b.
- the telecommunication system TS includes several destination networks (DANBx, DANCx and DANDx) .
- the destination networks are disclosed in figure 5 and represented by the destination centres MSCbx, MSCcx and MSCdx.
- the embodiment which now will be explained is used when the number of AAL2 packets to be sent to one access network are too few to constitute a cost efficient transfer in the payload part of an IP-packet.
- Figure 5 discloses a block schematic illustration of a source centre MCSax communicating with destination centres MSCbx, MSCcx and MSCdx via a core network CNx.
- the receiving input of a multiplexer receives voice packets from units in the source access network.
- First-In-First-Out registers FIFO:bx-FIFO: kx are connected to an output of the multiplexer MUXax.
- the received voice packets in this embodiment have different destination centres MSCbx, MSCcx and MSCdx specified as receivers .
- voice packets belonging to the destination centre MSCb are multiplexed into a First-In- First-Out-register FIFO:bx.
- voice packets belonging to the destination centre MSCc is multiplexed into a First-In-First-Out-register FIFO: ex and voice packets belonging to MSCd is multiplexed into FIFO:dx.
- a control unit CU selects which registers FIFO:b ⁇ -kx contain only a small number of voice packets after the lapse of a timer TIMERx.
- the number of voice packets, representing a small number could be an interval, for example 1-10.
- the voice packets in the selected FIFO- registers in this embodiment the registers FIFO:bx, FIFO : ex and FIFO:dx, are all multiplexed into a register FIFO-bx located within MSCa but belonging to MSCb.
- the reason that FIFO:b ⁇ -FIFO:dx have been selected is that the registers together have a number of voice packets suitable to transfer in the payload part of an IP-packet IP.
- the IP-packet is routed in the core network CNX to the centre MSCb in the destination access network DANBx.
- the destination centre MSCbx comprises a First-In-First-Out register FIFOx to which voice packets from the register FIFO-bx is received.
- the register FIFOx in the destination centre MSCb is connected to an input of a multiplexer MUXbx in the centre MSCB .
- the multiplexer distributes voice packets to addressed units lbx, 3bx and 4bx within the destination network DANBx.
- the voice packets that do not belong to units located within the network, i.e. voice packets that belong to the other two destination networks DANCx and DANDx are distributed via multiplexer to the FIFO-registers that transfer information to MSCcx and MSCdx via the core network CNx .
- the same core network CNx is disclosed twice. Voice packets sent to MSCcx and MSCdx are distributed to receiving units within respective network DANCx and DANDx.
- This second embodiment presumes some kind of organiser that keeps track of the sequence in which voice packets are sent from the source network. This can be done by, for example, adding information to the AAL2 header.
- voice packets from different chosen FIFO-registers are always sent together.
- Different destination networks are combined in clusters and voice packets in FIFO-registers belonging to a cluster is always put together and sent in one IP-packet to one of the destination networks in the cluster, i.e. a selected destination network, a so called master network.
- the voice packets belonging to other networks are further distributed to the other networks in the cluster.
- IP-packet Instead of always in one IP-packet send voice packets belonging to clusters, as a further variant, change over is done between that method and a method where transportation from one source network to one destination network takes place in an IP-packet that carries only voice packets intended for that destination network. If the number of IP-connections between the source network and the destination network is less than, for example, five, transition is done to the transportation to cluster method. The number of single IP-connections from a source to a destination network thereby decides whether or not it is cost efficient to continue.
- an AAL2-router is located in the core network and connected to one of the routers in the core network CNx.
- voice packets in the source centre MSCa were moved from FIFO-registers containing a low number of voice packets to the register FIFO-bx.
- voice packets from FIFO-registers having a low number of voice packets are moved to the AAL2- router .
- the received voice packets are distributed to the source centres MSCbx, MSCcx and MSCdx to which the voice packets belong.
- this embodiment contributes to a more cost efficient transfer of voice packets within the core network.
- IP-packet i.e. all variants of IP packets
- the discussed core network of IP-type can be situated between two base stations, i.e. the source and destination access networks in such embodiment are two radio interfaces including base stations and mobile units .
- AAL2 packets have been used as examples of packets to transport in the core network between access networks. It is also possible to use variants of AAL2 packets in the payload of the IP packet. These variants can be created by reducing the AAL2 packet header to just two octets. Removing the header Error Control and reducing the user to user indication can for example do this.
- the invention is not restricted to the above described and illustrated exemplifying embodiments, and modifications can be made within the scope of the claims .
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/110,332 US7397820B1 (en) | 1999-11-03 | 2000-10-26 | Voice packets in IP network |
AU14249/01A AU1424901A (en) | 1999-11-03 | 2000-10-26 | Voice packets in ip network |
DE10085160T DE10085160B4 (en) | 1999-11-03 | 2000-10-26 | Voice packets in IP network |
GB0209358A GB2372403B (en) | 1999-11-03 | 2000-10-26 | Voice packets in IP network |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9903982-8 | 1999-11-03 | ||
SE9903982A SE517961C2 (en) | 1999-11-03 | 1999-11-03 | Method and device for transmitting voice packets to multiple destinations in UMTS networks |
Publications (1)
Publication Number | Publication Date |
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WO2001033779A1 true WO2001033779A1 (en) | 2001-05-10 |
Family
ID=20417593
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/SE2000/002089 WO2001033779A1 (en) | 1999-11-03 | 2000-10-26 | Voice packets in ip network |
Country Status (8)
Country | Link |
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US (1) | US7397820B1 (en) |
KR (1) | KR100740743B1 (en) |
CN (1) | CN1157901C (en) |
AU (1) | AU1424901A (en) |
DE (1) | DE10085160B4 (en) |
GB (1) | GB2372403B (en) |
SE (1) | SE517961C2 (en) |
WO (1) | WO2001033779A1 (en) |
Cited By (2)
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US7260088B2 (en) | 2001-06-27 | 2007-08-21 | Siemens Aktiengesellschaft | Radio communication system and method for operating |
US7397820B1 (en) | 1999-11-03 | 2008-07-08 | Telefonaktiebolaget L M Ericsson (Publ) | Voice packets in IP network |
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US7002993B1 (en) * | 2000-08-18 | 2006-02-21 | Juniper Networks, Inc. | Method and apparatus providing media aggregation in a packet-switched network |
US7586899B1 (en) | 2000-08-18 | 2009-09-08 | Juniper Networks, Inc. | Methods and apparatus providing an overlay network for voice over internet protocol applications |
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- 1999-11-03 SE SE9903982A patent/SE517961C2/en not_active IP Right Cessation
-
2000
- 2000-10-26 KR KR1020027005652A patent/KR100740743B1/en not_active IP Right Cessation
- 2000-10-26 WO PCT/SE2000/002089 patent/WO2001033779A1/en active Application Filing
- 2000-10-26 AU AU14249/01A patent/AU1424901A/en not_active Abandoned
- 2000-10-26 DE DE10085160T patent/DE10085160B4/en not_active Expired - Fee Related
- 2000-10-26 US US10/110,332 patent/US7397820B1/en not_active Expired - Fee Related
- 2000-10-26 GB GB0209358A patent/GB2372403B/en not_active Expired - Fee Related
- 2000-10-26 CN CNB008153515A patent/CN1157901C/en not_active Expired - Fee Related
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DATABASE WPI Week 199928, Derwent World Patents Index; AN 1999-333953, XP002937251 * |
DATABASE WPI Week 200007, Derwent World Patents Index; AN 2000-082095, XP002937252 * |
GORAN ENEROTH ET AL.: "Applying ATM/AAL2 as a switching technology in third-generation mobile access networks", IEEE COMMUNICATIONS MAGAZINE, June 1999 (1999-06-01), pages 112 - 122, XP002937249 * |
PATENT ABSTRACTS OF JAPAN * |
R. SWAIN: "UMTS - A 21st century vision", IEE TELECOMMUNICATIONS CONFERENCE PUBLICATION, no. 404, March 1995 (1995-03-01), pages 235 - 242, XP002937250 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7397820B1 (en) | 1999-11-03 | 2008-07-08 | Telefonaktiebolaget L M Ericsson (Publ) | Voice packets in IP network |
US7260088B2 (en) | 2001-06-27 | 2007-08-21 | Siemens Aktiengesellschaft | Radio communication system and method for operating |
Also Published As
Publication number | Publication date |
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GB2372403B (en) | 2003-10-22 |
KR20020059670A (en) | 2002-07-13 |
CN1387716A (en) | 2002-12-25 |
CN1157901C (en) | 2004-07-14 |
SE9903982D0 (en) | 1999-11-03 |
SE9903982L (en) | 2001-05-04 |
AU1424901A (en) | 2001-05-14 |
GB2372403A (en) | 2002-08-21 |
SE517961C2 (en) | 2002-08-06 |
US7397820B1 (en) | 2008-07-08 |
DE10085160B4 (en) | 2011-08-11 |
DE10085160T1 (en) | 2002-10-24 |
GB0209358D0 (en) | 2002-06-05 |
KR100740743B1 (en) | 2007-07-19 |
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