Method and Apparatus for Transmission of Circuit Switched Voice Over Packet Switched Networks

• US 20090129375A1
• Filed: 08/21/2008
• Published: 05/21/2009
• Est. Priority Date: 08/22/2007
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Kapoor, Rohit, Sambhwani, Sharad Deepak, Mohanty, Bibhu P., Flore, Oronzo, Chaponniere, Etienne F., Yavuz, Mehmet
• Granted Patent: US 8,340,121 B2
• Time in Patent Office: Days
• US Class Current: 370/356
• CPC Class Codes: H04L 1/0006 by adapting the transmission format
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1854 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 2001/0097 Relays

Abstract

Systems and methodologies are described that facilitate and/or effectuate transmission of circuit switched voice over packet switched networks. The systems and methodologies provide for the receiving a first packet originating from access terminals and/or user equipment, determining within which hybrid automatic repeat request (HARQ) the first packet is received, ascertaining an amount of delay that is applied to the first packet before the first packet is forwarded into a core circuit switched network; and establishing a periodic time interval within which to convey subsequent packets that originate from the communicating access terminal and/or user equipment.

Claims

1. A method that effectuates transmission of circuit switched voice over packet switched networks, comprising:

receiving a first packet originating from an access terminal;

determining within which hybrid automatic repeat request (HARQ) the first packet is received;

ascertaining an amount of delay that is applied to the first packet before the first packet is forwarded into a core circuit switched network; and

establishing a periodic time interval based at least in part on the amount of delay within which to convey subsequent packets originating from the access terminal.

2. The method of claim 1, the ascertaining further comprising utilizing a product of a difference between a maximum number of hybrid automatic repeat requests (HARQs) and the hybrid automatic repeat request (HARQ) within which the first packet is received and a spacing interval established between the maximum number of hybrid automatic repeat requests (HARQs).

3. The method of claim 1, the ascertaining further comprising determining the amount of delay to apply to the first packet without decoding the first packet.

4. The method of claim 1, the periodic time interval within which subsequent packets originating from the access terminal are delayed dependent on a maximum jitter attributable to utilization of fast data transmission protocols.

5. The method of claim 1, further comprising identifying discontinuous transmission (DTXed) frames by extracting timestamp information included in a header associated with the first packet or the subsequent packets originating from the access terminal.

6. The method of claim 1, further comprising identifying fragmented packets attributable to the first packet or the subsequent packets originating from the access terminal or delaying conveyance of the first packet or the subsequent packets to the core circuit switched network until all fragmented packets attributable to the first packet or the subsequent packets have been received or reconstituted.

7. The method of claim 1, further comprising adaptively delaying conveyance of the first packet or the subsequent packets to the core circuit switched network to maintain an underflow rate established as a rate of arrival of packets later than a time at which the first packet or the subsequent packets are to be conveyed to the core circuit switched network, where the adaptively delaying conveyance of the first packet or the subsequent packets based at least in part on an initial delay established based at least in part on a difference between a transmission delay of the first packet and a product of a difference between a maximum number of hybrid automatic repeat requests (HARQs) and the hybrid automatic repeat request (HARQ) within which the first packet is received and a spacing interval established between the maximum number of hybrid automatic repeat requests (HARQs).

8. The method of claim 1, further comprising sending indication to the core circuit switched network where subsequent packets are not received within the periodic time interval within which to convey subsequent packets originating from the access terminal.

9. A wireless communication apparatus that effectuates transmission of circuit switched voice over packet switched networks, comprising:

means for receiving a first packet originating from an access terminal;

means for determining within which hybrid automatic repeat request (HARQ) the first packet is received;

means for ascertaining an amount of delay that is applied to the first packet before the first packet is forwarded into a core circuit switched network; and

means for establishing a periodic time interval within which to convey subsequent packets originating from the access terminal.

10. The wireless communications apparatus of claim 9, further comprising means for determining whether the first packet that is carried at regular intervals utilizes at least one of a high speed uplink packet access protocol or a high speed downlink packet access protocol.

11. The wireless communications apparatus of claim 9, wherein a frame number associated with the first packet is determinable based at least in part on a time of arrival of a frame associated with the first packet or the frame number of the first packet is identified based at least in part on a limitation imposed on a maximum number of hybrid automatic repeat requests (HARQs).

12. The wireless communications apparatus of claim 9, wherein the first packet signals an adaptive multi-rate (AMR) frame type included in a newly defined packet data convergence protocol (PDCP) protocol data unit (PDU) that employs at least one of an unused packet identifier (PID) for an existing packet data convergence protocol (PDCP) protocol data unit (PDU) or a packet size of a received frame.

13. The wireless communications apparatus of claim 9, further comprising means for determining whether the first packet is carried with jitter and with real time protocol (RTP) functionality provided by carrying a sequence number.

14. The wireless communications apparatus of claim 9, further comprising ascertaining whether the first packet is carried with jitter by utilizing one or more of a high speed uplink access protocol or a high speed download packet access protocol where discontinuous transmission (DTXed) frames are indicated by sending a No Data adaptive multi-rate (AMR) frame, and an adaptive multi-rate (AMR) frame type associated with the first packet or the subsequent packets is indicated in a newly defined packet data convergence protocol (PDCP) protocol data unit (PDU) type.

15. The wireless communications apparatus of claim 9, further comprising determining whether the first packet and subsequent packets are conveyed with jitter utilizing a high speed packet access protocol wherein discontinuous transmission (DTXed) frames are not transmitted over-the-air, the first packet and the subsequent packets are conveyed with real time protocol (RTP) functionality provided by carrying a sequence number and a timestamp, the timestamp is utilized to differentiate between an erased frame and a discontinuous transmission (DTXed) frame, or the timestamp is included in a newly defined packet data convergence protocol (PDCP) protocol data unit (PDU) type that carries an adaptive multi-rate (AMR) frame type.

16. A wireless communications apparatus, comprising:

a memory that retains instructions related to receiving a first packet originating from an access terminal, determining within which hybrid automatic repeat request (HARQ) the first packet is received, ascertaining an amount of delay that is applied to the first packet before the first packet is forwarded into a core circuit switched network, and establishing a periodic time interval within which to convey subsequent packets originating from the access terminal; and

a processor, coupled to the memory, configured to execute the instructions retained in the memory.

17. The wireless communication apparatus of claim 16, wherein the memory further retains instructions related to utilizing a product of a difference between a maximum number of hybrid automatic repeat requests (HARQs) and the hybrid automatic repeat request (HARQ) within which the first packet is received and a spacing interval established between the maximum number of hybrid automatic repeat requests (HARQs).

18. The wireless communication apparatus of claim 16, wherein the memory further retains instructions related to identifying discontinuous transmission (DTXed) frames by extracting timestamp information included in a header associated with the first packet or the subsequent packets originating from the access terminal.

19. The wireless communications apparatus of claim 16, wherein the memory further retains instructions related to at least one of identifying fragmented packets attributable to the first packet or the subsequent packets originating from the access terminal or delaying conveyance of the first packet or the subsequent packets to the core circuit switched network until all fragmented packets attributable to the first packet or the subsequent packets have been received or reconstituted.

20. The wireless communications apparatus of claim 16, wherein the memory further retains instructions related to at least one of adaptively delaying conveyance of the first packet or the subsequent packets to the core circuit switched network to maintain an underflow rate established as a rate of arrival of packets later than a time at which the first packet or the subsequent packets are to be conveyed to the core circuit switched network, where the adaptively delaying conveyance of the first packet or the subsequent packets based at least in part on an initial delay established based at least in part on a difference between a transmission delay of the first packet and a product of a difference between a maximum number of hybrid automatic repeat requests (HARQs) and the hybrid automatic repeat request (HARQ) within which the first packet is received and a spacing interval established between the maximum number of hybrid automatic repeat requests (HARQs).