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US 7,583,695 B2Granted
Hardware arrangement, terminal, and method for transferring audio signal in packet-switched communications network
AssigneeNokia Corporation
InventorsMarkku Vimpari, Simo Hyytiä, Jari Vallström, Pekka Kuure, Richard Bontempi
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Abstract
The invention relates to a protocol converter (14) and a method utilizing the converter, enabling a wireless connection (13) between a cellular network (11) and a terminal to apply a reduced RTP protocol according to the invention, instead of the RFC 1889 protocol, in order to save communications capacity on speech connections.
Claims12
A system comprising:
- a packet-switched telecommunication network comprising:
- fixed communications connections, operating nodes, base station subsystems, and wireless terminals, and a backbone network;
- and
- a protocol converter coupled between the operating nodes and the backbone network, the protocol converter configured to process a header of an RTP packet according to the IETF standard RFC 1889 as a header according to a reduced RTP protocol, containing four bytes at the most, so that a packet containing an audio signal sample is transferred on a wireless connection between a wireless terminal and a base station subsystem by utilizing the reduced RTP protocol for saving communications capacity, wherein the protocol converter is configured to:
- carry out conversion from reduced RTP protocol to standard RTP protocol;
- carry out conversion from standard RTP protocol to reduced RTP protocol;
- and
- where the header of a reduced RTP packet comprises the following fields:
- an Identification (F) field one bit long indicating if the packet includes a header of the reduced RTP protocol;
- a Marker (M) field one bit long according to RTP protocol;
- a Reserved (R) field one bit long;
- a Check (C) field one bit long indicating if a checksum field is included in the reduced RTP header;
- a Synchronization (S) field one bit long indicating if a synchronization source has been changed;
- a Payload Type (PT) field three bits long indicating a payload type;
- and
- a Sequence Number (SN) field eight bits long indicating an ordinal number of the RTP packet.
13 more elements
A method comprising:
- using a real-time packet-switched connection between a wireless terminal of a telecommunication network and a base station subsystem of the telecommunication network, where packets are transferred in a backbone network in RTP packets according to the IETF standard RFC 1889, and where the communication between a protocol converter, which connects the backbone network to an operating node in the telecommunication network, and the wireless terminal utilizes a reduced RTP protocol for saving communications capacity;
- detecting receipt of a packet in the protocol converter;
- determining whether the packet is targeted to a wireless network or a wired network;
- and
- automatically carrying out a conversion of the packet from the reduced RTP protocol to the standard RTP protocol or from the standard RTP protocol to the reduced RTP protocol;
- wherein the reduced RTP protocol headers comprise the following fields:
- an Identification (F) field one bit long indicating if the packet includes a header of the reduced RTP protocol;
- a Marker (M) field one bit long according to RTP protocol;
- a Reserved (R) field one bit long;
- a Check (C) field one bit long indicating if a checksum field is included in the reduced RTP header;
- a Synchronization (S) field one bit long indicating if a synchronization source has been changed;
- a Payload Type (PT) field three bits long indicating a payload type;
- and
- a Sequence Number (SN) field eight bits long indicating an ordinal number of the RTP packet.
11 more elements
Dependencies are inferred from the claim text.