Wireless base station systems for packet communications

• US 6,574,213 B1
• Filed: 12/14/1999
• Issued: 06/03/2003
• 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): Trost, William
• Assistant Examiner(s): Ferguson, Keith
• Application Number:
  US09/461,063
• Time in Patent Office: 1,267 Days
• Field of Search: 455/550, 455/561, 455/556, 455/557, 455/426, 455/466, 455/517, 455/422, 455/403, 370/338, 370/349, 370/352, 370/556
• US Class Current: 370/349
• CPC Class Codes: H04B 7/06 at the transmitting station
• CPC Class Codes: H04L 65/80 Responding to QoS
• CPC Class Codes: H04W 88/10 adapted for operation in multiple networks, e.g. multi-mode access points
• CPC Class Codes: H04W 88/181 Transcoding devices; Rate adaptation devices
• CPC Class Codes: H04W 92/02 Inter-networking arrangements
• 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 realtime 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.

Claims

1. A wireless base station comprising

cellular telephone wireless transmit/receive interface circuitry for communication with any cell telephone handsets in the vicinity of the wireless base station;

a packet network interface; and

at least one integrated circuit assembly coupling the cellular telephone wireless transmit/receive interface circuitry to the packet network interface, said at least one integrated circuit assembly providing voice over packet transmission and reception and including a rate-and-diversity control of voice packets.

2. A wireless base station comprising

cellular telephone wireless transmit/receive interface circuitry for communication with any cell telephone handsets in the vicinity of the wireless base station;

a packet network interface; and

at least one integrated circuit assembly coupling the cellular telephone wireless transmit/receive interface circuitry to the packet network interface, said at least one integrated circuit assembly providing voice over packet transmission and reception and holding bits defining a process of;

initially generating packets of real-time information with a source rate greater than zero kilobits per second, and a diversity rate, the diversity rate initially being at least zero kilobits per second;

forming a value of a criterion based on plural report data representative of quality of transmission to a destination, for transition to a different source rate; and

when the criterion is met, transitioning to the different source rate.

3. A wireless base station comprising

cellular telephone wireless transmit/receive interface circuitry for communication with any cell telephone handsets in the vicinity of the wireless base station;

a packet network interface; and

at least one integrated circuit assembly coupling the cellular telephone wireless transmit/receive interface circuitry to the packet network interface, said at least one integrated circuit assembly providing voice over packet transmission and reception and holding bits defining a process of;

generating code-excited linear prediction (CELP) based real-time information by CELP encoding;

concurrently producing Important Information from the CELP encoding, thereby achieving diversity;

packetizing the CELP-based real-time information and the Important Information from the CELP encoding, thereby generating packets and diversity packets.

4. A wireless base station comprising

cellular telephone wireless transmit/receive interface circuitry for communication with any cell telephone handsets in the vicinity of the wireless base station;

a packet network interface; and

at least one integrated circuit assembly coupling the cellular telephone wireless transmit/receive interface circuitry to the packet network interface, said at least one integrated circuit assembly providing voice over packet transmission and reception and holding bits defining reconstruction of a packet stream having a primary stage and a secondary stage, the secondary stage having one or more of LPC parameters, LTP lags, parity check, and adaptive and fixed codebook gains, the packet stream having an instance of single packet loss, and the reconstruction comprising;

receiving a packet sequence represented by