Abstract
A method and system for supporting voice over Internet protocol (VoIP) services over a wireless communication network are disclosed. Data is encoded at a coding rate specified by a controller for generating a VoIP packet. Among the encoded data bits sensitive to errors and bits not sensitive to errors are identified and error protection is performed separately by a medium access control layer and/or physical layer. A header of the VoIP packet may be selectively compressed in accordance with an indication from the controller. A user datagram protocol (UDP)-Lite may be used for partial coverage of the sensitive bits. A comfort noise may be generated by a receiving end during a silence period without receiving a comfort noise packet from a transmitting end. If the VoIP packet is not fit into a currently assigned radio resource the VoIP packet may be fragmented.
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| Not Available | 20/03/2007 | ISLD-200802-001 | INTERDIGITAL INC | Yes | Family Member | ||||
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Specification Information
Specification Information
Technologies
Family Information
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| Publication No | Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | Status | National Phase Entries | |||||
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Technologies
Protocol Stack
Product
Use Cases
Wireless communication
Services
Claim
1. An apparatus for supporting voice over Internet protocol (VoIP) services over a wireless communication network, the apparatus comprising: a VoIP codec for encoding transmit data and decoding receive data, a coding rate of the VoIP codec being specified by a controller, bits sensitive to errors and bits not sensitive to errors being identified among the encoded transmit data for separate error protection; an IP layer for generating a transmit VoIP packet by attaching an IP header to the encoded transmit data and processing a receive VoIP packet; a radio link control (RLC) layer for in-sequence delivery of the transmit VoIP packet and the receive VoIP packet; a medium access control (MAC) layer for transferring the transmit VoIP packet and the receive VoIP packet between communication peers; and a physical layer for transmitting the transmit VoIP packet and receiving the receive VoIP packet via a wireless channel.
2. The apparatus of claim 1 wherein the VoIP codec sends an explicit indication about the bits sensitive to errors and the bits not sensitive to errors, whereby the sensitive bits and the non-sensitive bits are separately processed for error protection.
3. The apparatus of claim 1 wherein the VoIP codec outputs the transmit data in a predetermined order in accordance with sensitivity to errors, whereby the sensitive bits and the non-sensitive bits are separately processed for error protection.
4. The apparatus of claim 1 wherein one of the RLC layer and the MAC layer divides the transmit VoIP packet into a plurality of fragments, whereby the sensitive bits and the non-sensitive bits are separately processed for error protection.
5. The apparatus of claim 4 wherein the MAC layer applies a more robust modulation and coding scheme for a fragment including the sensitive bits.
6. The apparatus of claim 4 wherein one of the RLC layer and the MAC layer divides the transit VoIP packet into fragments such that the number of fragments including the sensitive bits is as small as possible.
7. The apparatus of claim 4 wherein the MAC layer attaches a separate cyclic redundancy check (CRC) to each fragment.
8. The apparatus of claim 7 wherein the MAC layer is configured to transmit multiple transport blocks (TBs) in a same transmission time interval (TTI) and each fragment is transmitted via a separate TB with a separate CRC.
9. The apparatus of claim 7 wherein the MAC layer is configured to transmit one transport block (TB) in a transmission time interval (TTI) and each fragment is transmitted in a different TTI
10. The apparatus of claim 7 wherein the MAC layer attaches a CRC only to a fragment including the sensitive bits
11. The apparatus of claim 7 wherein the MAC layer attaches a CRC having higher strength in terms of error protection to a fragment including the sensitive bits
12. The apparatus of claim 1 wherein the sensitive bits and the non- sensitive bits are separately processed for error protection by the physical layer
13. The apparatus of claim 12 wherein the MAC layer sends an indication about the number and position of the sensitive bits to the physical layer
14. The apparatus of claim 12 wherein the physical layer applies less puncturing on the sensitive bits
15. The apparatus of claim 12 wherein the physical layer applies more repetition on the sensitive bits
16. The apparatus of claim 1 further comprising: a header compression and decompression entity for compressing a header of the transmit VoIP packet and decompressing a header of the receive VoIP packet
17. The apparatus of claim 16 wherein the header compression and decompression entity selectively performs the compression and decompression in accordance with an indication from the controller
18. The apparatus of claim 17 wherein the controller is located in one of a wireless transmit/receive unit (WTRU), a Node-B, a radio network controller (RNC), an access gateway (aGW) and a core network entity
19. The apparatus of claim 18 wherein the header compression and decompression entity selectively performs the compression and decompression in accordance with feedback regarding radio channel condition from a network entity.
20. The apparatus of claim 1 further comprising: a user datagram protocol (UDP) layer for attaching and detaching a UDP-Lite header including a checksum coverage field for partial coverage of the sensitive bits.
21. The apparatus of claim 20 further comprising: a header compression and decompression entity for compressing a header of the transmit VoIP packet and decompressing a header of the receive VoIP packet, wherein the controller sends an indication to the header compression and decompression entity regarding whether UDP-Lite is active or not, whereby a checksum coverage field of the UDP-Lite header is not compressed when UDP-Lite is active.
22. The apparatus of claim 1 wherein the controller sends a code mode request (CMR) to adjust the coding rate.
23. The apparatus of claim 1 wherein the controller sends an indication indicating a need for adjusting the coding rate and a code mode request (CMR) is sent to a communication peer in response to the indication.
24. The apparatus of claim 1 wherein the controller resides in a wireless transmit/receive unit (WTRU).
25. The apparatus of claim 1 wherein the controller resides in a Node-B.
26. The apparatus of claim 1 wherein the controller resides in an access gateway (aGW).
27. The apparatus of claim 1 further comprising: a comfort noise generator for generating a comfort noise, whereby the comfort noise is generated without receiving a comfort noise packet from a communication peer during a silence period.
28. The apparatus of claim 1 wherein the RLC layer sends all packets with an indication whether or not the packets are received successfully.
29. The apparatus of claim 1 wherein the MAC layer includes a plurality of hybrid automatic repeat request (H-ARQ) processes and implements synchronous H-ARQ.
30. The apparatus of claim 29 wherein at least two H-ARQ processes among a plurality of H-ARQ processes are assigned for the VoIP services such that the assigned H-ARQ processes are separated as far as possible.
31. The apparatus of claim 1 wherein the VoIP packet is fragmented to at least two fragments if the transmit VoIP packet is not fit into currently assigned radio resources, whereby the transmit VoIP packet is sent by fragments.
32. The apparatus of claim 31 wherein the MAC layer sends a request for additional radio resources along with a first fragment and sends remaining fragments using the additional radio resources.
33. The apparatus of claim 31 wherein radio resources are assigned periodically.
34. The apparatus of claim 33 wherein minimum radio resources are assigned periodically.
35. The apparatus of claim 31 wherein the MAC layer sends remaining fragments using additional radio resources which are subsequently assigned to the apparatus upon sending a first fragment.
36. The apparatus of claim 32 wherein the additional radio resources are assigned for remaining fragment.
37. The apparatus of claim 32 wherein the additional radio resources are assigned for the entire VoIP packet.
38. The apparatus of claim 32 wherein the MAC layer sends the remaining fragments using radio resources assigned for synchronous hybrid automatic repeat request (H-ARQ) retransmission of the packet.
39. The apparatus of claim 32 wherein the VoIP packet is a retransmission of previous failed packet.
40. The apparatus of claim 39 wherein the MAC layer transmits a retransmission of previous failed packet using the additional radio resources.
41. A method for supporting voice over Internet protocol (VoIP) services over a wireless communication network, the method comprising: encoding data, a coding rate being specified by a controller; identifying sensitive bits and non-sensitive bits among the encoded data; generating a VoIP packet by attaching an IP header to the encoded data; processing the VoIP packet for error protection, the error protection being performed on the sensitive bits and the non-sensitive bits separately; and transmitting the VoIP packet.
42. The method of claim 41 wherein sending an explicit indication about the bits sensitive to errors and the bits not sensitive to errors, whereby the sensitive bits and the non-sensitive bits are separately processed for error protection.
43. The method of claim 41 wherein the encoded data is arranged in a predetermined order in accordance with sensitivity to errors, whereby the sensitive bits and the non-sensitive bits are separately processed for error protection.
44. The method of claim 41 further comprising: fragmenting the VoIP packet into a plurality of fragments, whereby a fragment including sensitive bits and a fragment including non-sensitive bits are separately processed for error protection.
45. The method of claim 44 wherein the VoIP packet is fragmented by a radio link control (RLC) layer.
46. The method of claim 44 wherein the VoIP packet is fragmented by a medium access control (MAC) layer.
47. The method of claim 44 wherein a medium access control (MAC) layer applies a more robust modulation and coding scheme for a fragment including the sensitive bits.
48. The method of claim 44 wherein the VoIP packet is fragmented such that the number of fragments including the sensitive bits is as small as possible.
49. The method of claim 44 further comprising: attaching a separate cyclic redundancy check (CRC) to each fragment.
50. The method of claim 49 wherein a medium access control (MAC) layer is configured to transmit multiple transport blocks (TBs) in a same transmission time interval (TTI) and each fragment is transmitted via a separate TB with a separate CRC.
51. The method of claim 49 wherein a medium access control (MAC) layer is configured to transmit one transport block (TB) in a transmission time interval (TTI) and each fragment is transmitted in a different TTI.
52. The method of claim 49 wherein a CRC is attached only to a fragment including the sensitive bits.
53. The method of claim 49 wherein a CRC having higher strength in terms of error protection is attached to a fragment including the sensitive bits.
54. The method of claim 41 wherein a physical layer processes the sensitive bits and the non-sensitive bits separately for error protection.
55. The method of claim 54 wherein a medium access control (MAC) layer sends an indication about the number and position of the sensitive bits to the physical layer.
56. The method of claim 54 wherein the physical layer applies less puncturing on the sensitive bits.
57. The method of claim 54 wherein the physical layer applies more repetition on the sensitive bits.
58. The method of claim 41 further comprising: compressing a header of the VoIP packet.
59. The method of claim 58 wherein the compression is performed selectively in accordance with an indication from the controller.
60. The method of claim 59 wherein the controller is located in one of a wireless transmit/receive unit (WTRU), a Node-B, a radio network controller (RNC), an access gateway (aGW) and a core network entity.
61. The method of claim 58 wherein the compression is performed selectively in accordance with feedback regarding radio channel condition from a network entity.
62. The method of claim 61 further comprising: attaching a user datagram protocol (UDP)-Lite header including a checksum coverage field for partial coverage of the sensitive bits.
63. The method of claim 62 further comprising: the controller sending an indication regarding whether UDP-Lite is active or not, whereby a checksum coverage field of the UDP-Lite header is not compressed when UDP-Lite is active.
64. The method of claim 41 wherein the controller sends a code mode request (CMR) to adjust the coding rate.
65. The method of claim 41 wherein the controller sends an indication indicating a need for adjusting the coding rate and a code mode request (CMR) is sent to a communication peer in response to the indication.
66. The method of claim 41 wherein the controller resides in a wireless transmit/receive unit (WTRU).
67. The method of claim 41 wherein the controller resides in a Node- B.
68. The method of claim 41 wherein the controller resides in an access gateway (aGW).
69. The method of claim 41 further comprising: receiving a VoIP packet; processing the received VoIP packet for recovering VoIP data; and generating a comfort noise during a silence period without receiving a comfort noise packet.
70. The method of claim 69 further comprising: forwarding the received VoIP packet to an upper layer with an indication whether or not the received VoIP packet is received successfully.
71. The method of claim 41 further comprising: performing a synchronous hybrid automatic repeat request (H-ARQ) mechanism for transmission and retransmission of the VoIP packet.
72. The method of claim 71 wherein at least two H-ARQ processes among a plurality of H-ARQ processes are assigned for the VoIP services such that the assigned H-ARQ processes are separated as far as possible.
73. The method of claim 41 further comprising: fragmenting the VoIP packet to at least two fragments if the VoIP packet is not fit into currently assigned radio resources, whereby the VoIP packet is sent by fragments.
74. The method of claim 73 further comprising: sending a request for additional radio resources along with a first fragment, whereby remaining fragments are sent using the additional radio resources.
75. The method of claim 73 wherein radio resources are assigned periodically.
76. The method of claim 75 wherein minimum radio resources are assigned periodically.
77. The method of claim 74 wherein additional radio resources are assigned upon receipt of a first fragment, whereby remaining fragments are sent by using the additional radio resources.
78. The method of claim 74 wherein the additional radio resources are assigned for the remaining fragments.
79. The method of claim 74 wherein the addition radio resources are assigned for the entire VoIP packet.
80. The method of claim 73 wherein the remaining fragments are sent using radio resources assigned for synchronous hybrid automatic repeat request (H-ARQ) retransmission of the VoIP packet.
81. The method of claim 73 wherein the VoIP packet is a retransmission of previous failed packet.
82. The method of claim 81 wherein a previous failed VoIP packet is retransmitted by using the additional radio resources.
83. A system for supporting voice over Internet protocol (VoIP) services over a wireless communication network, the system comprising: a plurality of wireless transmit/receive units (WTRUs) configured to send a VoIP packet; a Node-B configured to group WTRUs located in a similar situation and periodically assign radio resources to the group WTRUs for a predetermined duration at the same time; and a core network for transferring the transmit VoIP packet and the receive VoIP packet.
84. The system of claim 83 wherein the period for radio resource assignment is based on a codec rate and re-transmission probability.
85. The system of claim 83 wherein the WTRU includes a special bit in the VoIP packet to indicate a change in control information and data flow.
86. The system of claim 83 wherein the WTRU fragments the VoIP packet to at least two fragments if the VoIP packet does not fit into currently assigned radio resources, whereby the VoIP packet is sent by fragments.
87. The system of claim 83 wherein the Node-B assigns minimum radio resources to each WTRU.
88. The system of claim 86 wherein additional radio resources are assigned upon receipt of a first fragment, whereby remaining fragments are sent by using the additional radio resources.
89. The system of claim 88 wherein the remaining fragments are sent using radio resources assigned for synchronous hybrid automatic repeat request (H-ARQ) retransmission of the VoIP packet.
90. The system of claim 86 wherein the WTRU sends a request for additional radio resources to the Node-B along with a first fragment, the Node-B assigns additional radio resources, and the WTRU sends remaining fragments using the additional radio resources.
91. The system of claim 90 wherein the additional radio resources are assigned for the remaining fragments.
92. The system of claim 90 wherein the addition radio resources are assigned for the entire VoIP packet.
93. The system of claim 83 wherein the Node-B assigns additional radio resources upon receipt of failed VoIP packet, whereby the WTRU retransmits a previous failed VoIP packet by using the additional radio resources.']
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SUMMARY
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Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
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