SUMMARY OF THE INVENTION In accordance with a first broad aspect, the invention seeks to provide a communication apparatus having a first interface for establishing a first communication link with a first remote entity, the first remote entity including a coding unit capable of operating in at least one mode selected from a set of modes, wherein each mode in the set of modes is associated with a respective coding requirement. If the profile is not already running, the ingress and egress gateway will need to switch AAL2 profile. Mobile radio communicating system including both a public system and at least one private system. Where packets are sent at 5 ms intervals, the packet will contain 5 EDUs. Year of fee payment: Peer gateways 31 , 32 on the packet network require some knowledge of their mutual capabilities to support TFO transparency.

3gpp ts 28.062

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Meanwhile, in the opposite tw i. Ideally, this knowledge is exchanged during call set-up. A method according to claim 2 wherein the packet comprises an indication of the quantity of TFO information carried within the packet.

3gpp ts 28.062

It is to be expressly understood that the description and drawings are only for purposes of illustration and as an aid to understanding, and are not intended to be a definition of the limits of the invention. Committed to connecting the world.

US7313115B2 – TFO-capable communication apparatus – Google Patents

In accordance with a first broad aspect, the invention seeks to provide a tts apparatus having a first interface for establishing a first communication link with a first remote entity, the first remote entity including a coding unit capable of operating in at least one mode selected from a set of modes, wherein each mode in the set of modes is associated with a respective coding requirement. The reason for this is that any mismatch between the existing position of the TFO message bits and the position at which TFO message bits are reinserted at the egress 34 may cause two different versions of the TFO information to exist, which could confuse downstream equipment.

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Data is decompressed by a voice processing function Once TFO operation is engaged by the control entity 36the audio data received from the mobile 14 no longer needs to be decoded and can bypass the decoder During the time that an egress’ gateway is in the TFO messaging stateit shall:.

What is sent to base station 18 in this case is coded audio data together with all or tx of its decoded version, which can be sent for reasons related to law enforcement or safety e.

3gpp ts 28.062

Relationship with other existing or emerging documents: The apparatus defined in claim 11wherein said apparatus maintains a set of modes in which said apparatus will allow the coding unit in the first remote entity to operate, said control entity being operative to send the control information to the first remote entity via said first interface to cause the encoder in the first remote entity to operate in the mode other than the designated mode only if the mode other than the designated mode belongs to the set of modes in which said apparatus will allow the coding unit in the first remote entity to operate.

The block diagram of the remote base station 18 and the remote mobile 24 is identical and for this reason it is not shown. Various modifications will become apparent to those skilled in the art and are within the scope of the invention, which is defined more particularly by the attached claims. The first bit of the first message sent to the far gateway 32 shall be the first bit of a TFO message header.

The apparatus can be arranged to perform any of the steps of the method. Provision of telecommunications control program data pursuant to preliminary data exchange between system elements.

3gpp ts 28.062

For an SMV codec, this designated mode may be mode 4 or mode 5. For example, if the gateway supports the format proposed in the IETF internet draft draft-ietf-avt-rtp-clearmode When the sync pattern is recognised, the 288.062 33 of gateway 31 moves to the TFO messaging state A method according to claim 1 further comprising a step of recognising the synchronisation pattern of the TFO information and, wherein, the step of controlling removing TFO information from the stream of voice data to ensure that the TFO information does not leak through to voice data comprises monitoring the frame alignment of the TFO information and performing resynchronization when the alignment of the TFO information slips.

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The ingress entity determines whether 82.062 stream of voice data contain tandem free operation TFO information and, if TFO information is present, sends 288.062 TFO information across the packet network without subjecting it to processing.

Operating in this manner has a number of disadvantages.

ITU-T A.5 reference justification

In the case of an SMV codec, the supported modes are mode 0 premiummode 1 standardmode 2 economy and mode 3 capacity-saving.

The depth field has the format shown in FIG. Various technologies exist for carrying PCM traffic across a packet or cell-based network and 28.06 are well documented. This is equivalent to an average bit rate of 10 bits per 20 ms, or bits per second. Other suitable codecs that can be used without departing from the spirit of this invention include, but are not limited to EVRC, Q8 and Q13 multi-rate speech codecs.

Whether modes 012 or 3 are supportable depends on conditions of capacity, bandwidth and quality of service, among others. Referring again to FIG. Further disadvantages of operating in this way are that speech processing e.

3gpp ts 28.062 pdf

These include echo cancellation, gain adjustment and silence suppression. An SMV codec has several modes of operation. Method of establishing tandem free operation mode in a 28.026 mobile telephone network.

The codecs 30 and 38 are characterized in that they can operate in a plurality of modes.