Method and apparatus for flexible packet selection in a wireless communication system

• US 20060050743A1
• Filed: 08/30/2005
• Published: 03/09/2006
• Est. Priority Date: 08/30/2004
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Kapoor, Rohit, Black, Peter John, Yavuz, Mehmet, Spindola, Serafin Diaz
• Granted Patent: US 8,331,385 B2
• Time in Patent Office: Days
• US Class Current: 370/516
• CPC Class Codes: G10L 19/005 Correction of errors induced by the transmission channel, if related to the coding algorithm
• CPC Class Codes: H04J 3/0632 Synchronisation of packets and cells, e.g. transmission of voice via a packet network, circuit emulation service [CES] queuing arrangements in packet switching elements H04L49/90; synchronising systems for the synchronous transmission of a pulse code modulated video signal with one or more other pulse code modulated signals H04N7/56
• CPC Class Codes: H04L 12/66 Arrangements for connecting between networks having differing types of switching systems, e.g. gateways
• CPC Class Codes: H04L 47/10 Flow control; Congestion control
• CPC Class Codes: H04L 47/2416 Real-time traffic
• CPC Class Codes: H04L 47/28 in relation to timing considerations
• CPC Class Codes: H04L 47/29 using a combination of thresholds
• CPC Class Codes: H04L 47/30 in combination with information about buffer occupancy at either end or at transit nodes
• CPC Class Codes: H04L 49/90 Buffering arrangements
• CPC Class Codes: H04L 49/9094 Arrangements for simultaneous transmit and receive, e.g. simultaneous reading/writing from/to the storage element
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/752 adapting media to network capabilities
• CPC Class Codes: H04L 65/80 Responding to QoS

Abstract

Adaptive De-Jitter Buffer for Voice over IP (VoIP) for packet switch communications. The de-jitter buffer methods and apparatus presented avoid playback of underflows while balancing end-to-end delay. In one example, the de-jitter buffer is recalculated at the beginning of each talkspurt. In another example, talkspurt packets are compressed upon receipt of all remaining packets.

Claims

1. An apparatus, comprising:

a buffer memory storage unit configured to store packets of data; and

means for buffer adaptation configured to compare sequence identifiers of received packets of data to a playback sequence, the first controller configured to select at least one of the received packets for playback.

2. The apparatus as in claim 1, wherein the means for buffer adaptation is further configured to initiate playback of an erasure if an anticipated packet having an anticipated playback sequence identifier is not received, wherein the erasure is played back at an anticipated playback time for the anticipated packet.

3. The apparatus as in claim 2, wherein the means for buffer adaptation is further configured to:

determine a next anticipated playback time;

compare sequence identifiers of received packets to a plurality of sequence identifiers, including the anticipated playback sequence identifier; and

initiate playback of an erasure if the anticipated packet and the next sequential packet are not received, wherein the erasure is played back at a next anticipated playback time for the anticipated packet.