Packet reconstruction processes for packet communications

• US 6,801,532 B1
• Filed: 12/14/1999
• Issued: 10/05/2004
• Est. Priority Date: 08/10/1999
• Status: Expired due to Term

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Viswanathan, Vishu R., McCree, Alan V., Anandakumar, Krishnasamy
• Primary Examiner(s): Vu, Huy D.
• Assistant Examiner(s): Philpott, Justin M.
• Application Number:
  US09/461,676
• Time in Patent Office: 1,757 Days
• Field of Search: 370/229-234, 370/342, 370/394, 704/219-223, 704/262, 704/264
• US Class Current: 370/394
• CPC Class Codes: H04B 7/06 at the transmitting station
• CPC Class Codes: H04W 88/181 Transcoding devices; Rate adaptation devices
• CPC Class Codes: H04W 92/045 between access point and backbone network device

Abstract

A process (111,101) of sending packets of real-time information at a sender (311) includes steps of initially generating at the sender the packets of real-time information with a source rate (s11) greater than zero kilobits per second, and a time or path or combined time/path diversity rate (d11), the amount of diversity (d11) initially being at least zero kilobits per second. The process sends the packets, thereby resulting in a quality of service QoS, and optionally obtains at the sender (311) a measure of the QoS. Rate/diversity adaptation decision may be performed at receiver (361′) instead. Another step compares the QoS with a threshold of acceptability (Th1), and when the QoS is on an unacceptable side of said threshold (Th1) increases the diversity rate (d11 to d22) and sends not only additional ones of the packets of real-time information but also sends diversity packets at the diversity rate as increased (d22). Increasing the diversity rate (d11 to d22) while either reducing or keeping unchanged the overall transmission rate (sij+dij) is an important new improvement in even solely-time-diversity embodiments. In another form of the invention a single-chip integrated circuit includes a processor circuit (1511), and a rate-and-diversity control (1561). Here again, the diversity is contemplated to be time diversity, path diversity, and combined time/path diversity in various embodiments. Other embodiments disclosed encompass other processes, improved packets and packet ensembles, integrated circuits, chipsets, computer add-in cards, information storage articles, systems, computers, gateways, routers, cellular telephone handsets, wireless base stations, appliances, and packet networks, and other forms as claimed.

Claims

1. A process of reconstructing a stream of packets, each packet having a primary stage containing real-time information and a secondary stage containing diversity information of real-time information contained in the primary stage of a packet occurring prior in the stream, the diversity information being only information representing Linear Predictive Coding, Longterm Prediction lags, parity check, and adaptive and fixed codebook gains, the packet stream having an instance of a single packet loss, and the process comprising:

A. receiving a packet sequence represented by;

P(n)P(n−

1)′

, [Lost Packet], P(n+2)P(n+1)′

, and P(n+3)P(n+2)′

;

B. obtaining the diversity information from the secondary stage in a packet following the lost packet including obtaining information representing Linear Predictive Coding, and at least one of Longterm Prediction lags, parity check, and adaptive and fixed codebook gains; and

C. performing an excitation reconstruction from the obtained diversity information to reconstruct the lost packet.

2. The process of claim 1 wherein the obtaining and performing steps produce the following reconstructed sequence:

P(n), [P(n+1)′

|−

](excitation), P(n+2), and P(n+3).

3. The process of claim 1 in which the performing is the replacement excitation generation scheme of G.729 standard, section 4.4.4.

4. The process of claim 1 in which the process is for a media-specific redundancy scheme.

5. The process of claim 1 in which the process is for Voice over Internet Protocol and Voice Over Packet communications.

6. The process of claim 1 including no diversity offset.