Encoding in long-distance wireless communication

The present invention relates to telecommunications, more specifically wireless telecommunications.

In the known universal mobile telecommunications system (UMTS, from the English - universal mobile telecommunication system), some messages are encoded. Coding team initiated the transition to safe mode, through which the terrestrial network radio access UMTS (UTRAN, from the English - UMTS terrestrial radio access network), the core network transmits and receives mobile terminal. This is followed by a response command to transition to the secure mode, the mobile terminal which transmits and receives the core network.

For example, as shown in Figure 1, after receiving a request to conduct one session or bearer establishment of a core network (CN) 2 transmits the command to the UTRAN 6 to 4 transition safe mode. The UTRAN 6 4 sends a command transition to safe mode mobile terminal (user equipment, AA 8). In response, the mobile terminal 8 initiates its encoding algorithms using certain parameters, sometimes referred to as a security context and then transmits an acknowledgment response 10 to command transition to the secure mode 10 of the UTRAN 6 transmits a response 10 that the core network 2. The base network 2 via UTRAN 6 transmits a mobile terminal 8 to the encoded message without access (NAS, than English - Non Access Stratum), such as a response 12 to request for a communication session.

According to this known approach transition message to the secure mode are not encoded as they contain information about encoding required for the coding of subsequent messages.

Another area of ​​prior art is the network with the prospect of development (LTE, from the English - long term evolution). Currently, based on the UMTS network being developed called the prospect of (LTE). For more information on networks with a view to development can be gleaned from the technical specification TS23.882 3GPP (Third Generation Partnership Project, the English - Third Generation Partnership Project).

From the publication US-A-2004/024 012 discloses a process for transmitting the encoded user data to the mobile terminal in a wireless telecommunications, in which a mobile terminal transmits a data packet containing an identifier information on the coding for use in recovering the encoded user data, and user data, encoded by said encoding information.

The present invention differs from US-A-2004/024 012 that, in response to receipt of a data packet, the mobile terminal performs initiation its security context using the identified information coding, wherein the network includes a Universal Mobile Telecommunications System (UMTS) or a network with the prospect of (LTE).

The present invention is characterized in independent claims of the appended claims. Some preferred features are set out in the dependent claims.

One example of the present invention is a method for transmitting the encoded user data to the mobile terminal in a wireless telecommunications. In the method a mobile terminal transmits a data packet. The data packet contains an identifier coding information for use in restoring the coded user data, and user data encoded using said encoding information.

The present invention is based on the fact that according to the conventional approach of the team go to the safe mode and send a reply message lead to delay procedures for communication. For example, when the mobile terminal moves into the coverage area of another base station, can be used to change the encryption key. This requires the branch instruction to a secure mode and transfer a response message to notify the mobile terminal of the new key before transmitting the data encoded using the new key. This additional messaging can lead to further delay. This delay can be tedious etc. A subscriber and can create difficulties in applications sensitive to delays in establishing a connection, such as "hit - talk" (PTT, by the English - push-to-talk).

In some embodiments, such delays can be reduced.

Further by way of example are described embodiments of the invention with reference to the drawings, in which:

1 shows a diagram illustrating a known approach to the initiation of the coding in the course of a communication session (prior art)

Figure 2 - a diagram illustrating a network from the perspective of (LTE) according to a first embodiment of the present invention,

3 - schematic diagram illustrating one approach to encoding during the initiation of a communication session in the network shown in Figure 2,

4 - schematic diagram illustrating the structure of NAS messages, transmitted during a communication session,

Figure 5 - a diagram illustrating a coding NAS signaling messages,

6 - a diagram illustrating a handover between the nodes of the core network (CN) and the LTE network,

7 - a diagram illustrating a coding initiation during connection establishment when radio resource control (RRC or RRC, than English - Radio resource control) in the LTE network,

8 - a diagram illustrating a network based on Universal Mobile Telecommunications System (UMTS) according to a second embodiment of the present invention and

9 - diagram illustrating one approach to encoding during the initiation of a communication session in the network shown in Figure 8.

The following describes one example of the LTE network technology, and then explain how the coding is initiated during a communication session with the composite message. After that explains how the coding in a handover of a mobile terminal from one core network node (BS) to another. Then described an alternative consolidated message.

Next, the alternative network, which is a UMTS network technology, and then explain how triggered encoding in this network.

Network with the prospect of

Figure 2 illustrates in principle the network 14 based on the LTE network based on the Universal Mobile Telecommunications System (UMTS). The core network includes modules Mobility Management (MUM, or MME, from the English - Mobile Management Entities). Each stage has a 16 MUM 26 encoding messages NAS. Figure 2 shows for simplicity only the mobility management module (MUM) 16 of the core network 18 and one base station 20, LTE network 14. LTE network has a plurality of base stations. In the drawings, the base station is also referred to as "eNode B" according to the terminology adopted in LTE. A cell, also called a sector, is a zone of radio coverage, which is serviced by a corresponding base station antenna. Each base station 20 typically has three cells 22, each of which is served by one of three directional antennas 24 arranged at 120 degrees to each other in azimuth. In operation, the mobile user terminal 28 (often referred to as user equipment (UE) according to the terminology adopted in the LTE / UMTS) communicating with the mobility management module 16 through at least one cell 22, at least one base station 20. In this manner, the mobile the subscriber terminal is communicating with the network UTRAN.

Initiation coding during the session

The authors came to the conclusion that combine the team go to the safe mode and the message of the work without access (NAS) (such as a response to the request for the session) in a single consolidated report. The first part of the message is a command switch to safe mode, and this part is not encoded. The second part of the message is the NAS message, and this part is coded.

As shown in Figure 3, after receiving the request 30 for conducting a communication session, the mobility management unit 16 transmits the base station 20 consolidated message 32 consisting of uncoded command transition to the secure mode and the encoded service message NAS. Thereafter, the base station 20 sends a summary message 32 to the mobile terminal (user equipment (UE) 28). The mobile terminal 28 performs the initiation of its security context and then gives confirmation by sending the base station 20 34 response to the command switch to safe mode, which is sent to the mobility management module 16. Thereafter MUM 16 through base station 20 to the mobile terminal 28 transmits a coded message on the work without access (NAS), such as a response 36 to request for a communication session.

Figure 4 shows the above-mentioned consolidated message 32 consisting of uncoded command 38 switch to safe mode and coded messages NAS 40. 38 Team transition to safe mode consists of items of information, information describing the context of security, such as encryption key identifier that should be used, and for example, the identifier of the start of encoding. NAS message 40 comprises information elements constituting the answer to a request for a communication session.

Creating a consolidated Posts

Coding NAS message in the LTE network 14 is performed by coding stages 26 at the corresponding nodes of the core network 18. Encoding NAS messages is independent of the coding of the user data. As shown in Figure 5, the NAS message to encode with information for coding, such as encryption keys, is introduced into stage 26 encoding outputs a coded message 40. Encoded NAS NAS message 40 are concatenated with the contents of the unencrypted header 38. This is possible because MUM 16 generally allows encoding at least a portion of concatenating the NAS message to the other part of the uncoded message.

Manipulation encoded after the handover

Handover is a process of transition of the mobile terminal 28 by connecting to one base station 20 and, therefore, core network node 18 for connection with another base station (not shown) and therefore, other core network node (not shown). Sometimes called the handover a takeover.

6 shows an example of a handover procedure. Initially, a connection is established with the base station 20 by using the first encryption key. Core network node 18 via base station 20 transmits a handover command 42 to the mobile terminal 28, followed by transmission service 44 while establishing a connection with another base station 20 'and, consequently, the node 20' of the core network. The mobile terminal 28 transmits the new base station 18 'and, consequently, the node 18' of the core network a message 46 "complete handover." Next, core network node 48 transmits the message summary, consisting of 50 uncoded command transition to the secure mode, comprising the previously discussed coding key IDs, followed by an encoded user data portion 52, such as overhead messages NAS. For example, when the core network node has modified encoding in the branch instruction to the secure mode messages from the first composite 50 of the new node 18 'of the core network indicates the new security parameters to be used, and in an encoded form contains new NAS service messages. In an otherwise similar embodiment, if the coding and coding configuration implemented in the user plane, the composite packet in the user plane consists of uncoded command transition to the secure mode, concatenated with the user data.

Of course, in some embodiments, the transition to a new encryption key by transmitting a composite message comprised of uncoded command transition to the secure mode, comprising identifiers encryption key followed by the coded portion of the user data encoded using that encryption key may be performed simultaneously with the handover between cells. For example, in another embodiment the previous cell and the new cell location may be one and the same cell. In this example, the cell originally communicates with the mobile terminal by using previous coding parameters. During the session, the cell transmits new encoding parameters and the additional user data. The mobile terminal receives the new coding parameters. The mobile terminal uses the new coding parameters to decode the coded part of the packet. The mobile terminal also stores the new coding parameters for subsequent use in decoding subsequent packets, which are encoded using the new coding parameters.

Radio Resource Control

As shown in Figure 7, may also be transferred consolidated message consisting of uncoded command transition to the secure mode and the encoded segment containing the user data, wherein the data portion containing user message includes radio resource control (RRC). As shown in Figure 7, the base station 20 "transmitting a request RRC Connection 54, in response to which the base station transmits to the mobile terminal 28 'consolidated message 56, which, in particular, contains unencoded transition command to a secure mode, followed by an encoded ( new key) response to the RRC connection request. Then, the user terminal 28 'transmits the response to the command go to safe mode.

An example of another system: UMTS

This network is the terrestrial radio access network (UTRAN) Universal Mobile Telecommunications System (UMTS), which is one of the varieties of multiple access broadband code division multiple access (CDMA, than English - Code Division Multiple Access) mobile telecommunications. The UTRAN generally shown in Figure 8. For simplicity, only one radio network controller and two base station network UTRAN 62. It also shows that the UTRAN 62 has base stations 64. Each base station 64 is also designated as "Node B" in accordance with the terminology adopted in UMTS. A cell, also called a sector, is a zone of radio coverage, which is serviced by a corresponding base station antenna. Each base station typically has three cells 66, each of which is served by one of three directional antennas 67 arranged at 120 degrees to each other in azimuth. Each radio network controller (RNC or RNC, from English - radio network controller) 68 usually controls several base stations 64 and, hence, multi-cell 66. Base station 64 is connected to the control it Radio Network Controller (RNC) 68 via respective interface 69 known as Interface IuB. In operation, the mobile user terminal 70 (often referred to as user equipment (UE) according to the terminology adopted in UMTS) communicates with a serving radio network controller 68 (RNC) via at least one cell 66 by at least one base station 64. In this manner, MSS communicates with the UTRAN 62.

RNC is connected to a node 72 providing signaling gateway (UOSHS or SGSN, from English - Signalling Gateway Support Node) 74. The core network 72 includes a cascade UOSHS 76 NAS message encoding, which is described in more detail hereinafter.

Initiation coding hold a session on the example of UMTS

The authors came to the conclusion that combine the team go to the safe mode and the message of the work without access (NAS) (such as a response to the request for the session) in a single consolidated report. The first part of the message is a command switch to safe mode, and this part is not encoded. The second part of the message is the NAS message, and this part is coded.

As shown in Figure 9, after receiving the request 78 for conducting a communication session UOSHS 72 transmits the RNC 68 and, consequently, the base station 64 consolidated message 80 consisting of uncoded command transition to the secure mode and the encoded service message NAS. Thereafter, the base station 64 sends a summary message 80 to the mobile terminal (user equipment (UE) 70).

Consolidated message 80 consists of uncoded command transition to safe mode and coded messages NAS. The command transition to the secure mode consists of information elements describing the security context information such as an identifier of the encryption key to be used, and for example, the identifier of the start of encoding. Part of the message 80 consisting of coded NAS message 40 comprises information elements constituting the answer to a request for a communication session.

The mobile terminal 70 initiates a security context and then transmits an acknowledgment response 82 to command transition to the secure mode, the base station 64 and, therefore, RNC 68, which forwards the response 82 UOSHS 72.

General provisions

The present invention may be embodied in other specific forms without departing from its essential characteristics. The described embodiments are to be considered in all respects only as illustrative and not restrictive. In this regard, the invention is not limited by the foregoing description but by the appended claims. The considered to be within its scope all changes within the meaning and equivalents of the claims series.

Some cuts

BS: the core network

UMTS: Universal Mobile Telecommunications System

AA: user equipment

NAS: work without access (also known as protocol core network)

MUM: mobility management module

LTE: the prospect of a term used in 3GPP in relation to the system after being standardized UMTS

EI: information element

RRC: Radio Resource Control (responsible for radio resource control protocol level, which is called the level of work to access)

UOSHS: providing signaling gateway node.