초록 ▼

A back haul architecture effectively reduces the reactivation times for both forward-link and reverse-link data transmissions over CDMA wireless communications systems, by relying on packet-mode transmissions over the back haul between a frame selection/distribution (FSD) function and the appropriat

A back haul architecture effectively reduces the reactivation times for both forward-link and reverse-link data transmissions over CDMA wireless communications systems, by relying on packet-mode transmissions over the back haul between a frame selection/distribution (FSD) function and the appropriate base stations. In particular, for the forward direction, the FSD function transmits forward-link data only to one base station, which is solely responsible for controlling the forward-link air interface with the corresponding mobile unit. For the reverse direction, each base station that receives frames of reverse-link data from the mobile unit, assigns a time tag to the frame, divides the frame into one or more data packets, assigns a different sequence number to each data packet, and transmits the data packets to the FSD function over the back haul, all without first synchronizing time with any other base station that is also operating in reverse-link soft hand-off with that mobile unit.

대표청구항 ▼

1. A wireless communications method, comprising the steps of:(a) receiving at a first base station of a wireless communications system one or more frames of reverse-link data over an air interface;(b) assigning at the first base station a time tag to each frame of reverse-link data;(c) dividing at t

1. A wireless communications method, comprising the steps of:(a) receiving at a first base station of a wireless communications system one or more frames of reverse-link data over an air interface;(b) assigning at the first base station a time tag to each frame of reverse-link data;(c) dividing at the first base station each frame of reverse-link user data into one or more reverse-link data packets;(d) assigning at the first base station a sequence number to each reverse-link data packet;(e) transmitting the one or more reverse-link data packets from the first base station to a data selection function of the wireless communications system; and(f) determining by the data selection function whether to include each reverse-link data packet received from the first base station into one or more reconstructed frames of reverse-link data based on at least one of the assigned time tag and the assigned sequence number. 2. The invention of claim 1, wherein the wireless communications system is an IS-95 CDMA system and the data selection function is part of a frame selection/distribution (FSD)/radio link protocol (RLP) function. 3. The invention of claim 1, further comprising the steps of:(g) receiving at a second base station of the wireless communications system the one or more frames of reverse-link data;(h) assigning at the second base station a time tag to each frame of reverse-link data;(i) dividing at the second base station each frame of reverse-link user data into one or more reverse-link data packets;(j) assigning at the second base station a sequence number to each reverse-link data packet;(k) transmitting the one or more reverse-link data packets from the second base station to the data selection function, wherein the data selection function determines whether to include each reverse-link data packet received from the first and second base stations into the one or more reconstructed frames of reverse-link data based on at least one of the assigned time tag and the assigned sequence number. 4. The invention of claim 3, wherein the first and second base stations transmit the one or more reverse-link data packets to the data selection function without first synchronizing timing with each other. 5. The invention of claim 1, wherein the time tag corresponds to a global positioning system (GPS) time. 6. The invention of claim 1, wherein the sequence number for a particular reverse-link data packet is a function of the amount of data in all previous reverse-link data packets for the corresponding frame. 7. The invention of claim 1, wherein step (a) further comprises the steps of:(1) receiving at the first base station over the air interface a message indicating that a mobile unit has the reverse-link data to transmit;(2) transmitting and receiving at the first base station one or more messages to coordinate a transmission rate with one or more other base stations of the wireless communications system; and(3) transmitting a transmission rate message from the first base station over the air interface without first synchronizing timing between the first base station and the one or more other base stations. 8. The invention of claim 1, further comprising the steps of:(g) receiving forward-link data at a data distribution function of the wireless communications system;(h) transmitting the forward-link data from the data distribution function using packet-mode transmissions to only the first base station; and(i) determining at the first base station whether to transmit the forward-link data over the air interface using a fundamental channel or a supplemental channel. 9. The invention of claim 8, wherein:functionality for controlling retransmission of forward-link data over the air interface is implemented at the data distribution function; andfunctionality for segmentation of new forward-link data for transmission over the air interface is implemented at the first base station. 10. The invention of claim 9, wherein functionality for phys ical layer framing, re-segmentation of retransmitted forward link data, error detection and correction of air interface transmissions, channel encoding, multiplexing of segmented new forward-link data and resegmented retransmitted forward-link data, multiplexing of multiple data streams of forward-link data, encryption, determination of air interface transmission rates for sharing bandwidth of the air interface among multiple data streams, and scheduling of transmissions of the forward-link data over the air interface is implemented at the first base station. 11. The invention of claim 1, wherein the assigned time tag is used to perform a reverse outer-loop power control function. 12. A wireless communications system, comprising a first base station configured to:(a) receive one or more frames of reverse-link data over an air interface;(b) assign a time tag to each frame of reverse-link data;(c) divide each frame of reverse-link user data into one or more reverse-link data packets; and(d) assign a sequence number to each reverse-link data packet. 13. The invention of claim 12, further comprising a data selection function in communication with the first base station, wherein:the first base station is further configured to:(e) transmit the one or more reverse-link data packets to the data selection function; and the data selection function is configured to:(f) determine whether to include each reverse-link data packet received from the first base station into one or more reconstructed frames of reverse-link data based on at least one of the assigned time tag and the assigned sequence number. 14. The invention of claim 13, wherein the wireless communications system is an IS-95 CDMA system and the data selection function is part of an FSD/RLP function. 15. The invention of claim 13, further comprising a second base station configured to:(g) receive the one or more frames of reverse-link data;(h) assign a time tag to each frame of reverse-link data;(i) divide each frame of reverse-link user data into one or more reverse-link data packets;(j) assign a sequence number to each reverse-link data packet; and(k) transmit the one or more reverse-link data packets to the data selection function, wherein the data selection function is configured to determine whether to include each reverse-link data packet received from the first and second base stations into the one or more reconstructed frames of reverse-link data based on at least one of the assigned time tag and the assigned sequence number. 16. The invention of claim 15, wherein the first and second base stations are configured to transmit the one or more reverse-link data packets to the data selection function without first synchronizing timing with each other. 17. The invention of claim 13, further comprising a data distribution function configured to:(g) receive forward-link data; and(h) transmit the forward-link data using packet-mode transmissions to only the first base station, wherein the first base station is further configured to:(i) determine whether to transmit the forward-link data over the air interface using a fundamental channel or a supplemental channel. 18. The invention of claim 17, wherein:functionality for controlling retransmission of forward-link data over the air interface is implemented at the data distribution function; andfunctionality for segmentation of new forward-link data for transmission over the air interface is implemented at the first base station. 19. The invention of claim 18, wherein functionality for physical layer framing, re-segmentation of retransmitted forward link data, error detection and correction of air interface transmissions, channel encoding, multiplexing of segmented new forward-link data and resegmented retransmitted forward-link data, multiplexing of multiple data streams of forward-link data, encryption, determination of air interface transmission rates for sharing bandwidth of the air interface among multiple data streams, and sch eduling of transmissions of the forward-link data over the air interface is implemented at the first base station. 20. The invention of claim 13, wherein the assigned time tag is used to perform a reverse outer-loop power control function. 21. The invention of claim 12, wherein the time tag corresponds to a GPS time. 22. The invention of claim 12, wherein the sequence number for a particular reverse-link data packet is a function of the amount of data in all previous reverse-link data packets for the corresponding frame. 23. The invention of claim 12, wherein the first base station is further configured to:(1) receive over the air interface a message indicating that a mobile unit has the reverse-link data to transmit;(2) transmit and receive one or more messages to coordinate a transmission rate with one or more other base stations of the wireless communications system; and(3) transmit a transmission rate message over the air interface without first synchronizing timing between the first base station and the one or more other base stations. 24. A wireless communications system, comprising a data selection function configured to:(a) receive one or more reverse-link data packets from a first base station; and(b) determine whether to include each reverse-link data packet received from the first base station into one or more reconstructed frames of reverse-link data based on at least one of an assigned time tag and an assigned sequence number corresponding to each reverse-link data packet. 25. The invention of claim 24, wherein the wireless communications system is an IS-95 CDMA system and the data selection function is part of an FSD/RLP function. 26. The invention of claim 24, wherein the data selection function is further configured to:(c) receive one or more reverse-link data packets from a second base station, each reverse-link data packet having an assigned time tag and an assigned sequence number; and(d) determine whether to include each reverse-link data packet received from the first and second base stations into the one or more reconstructed frames of reverse-link data based on at least one of the assigned time tag and the assigned sequence number. 27. The invention of claim 24, further comprising a data distribution function configured to:(d) receive forward-link data; and(e) transmit the forward-link data using packet-mode transmissions to only the first base station, wherein the first base station is further configured to:(f) determine whether to transmit the forward-link data over the air interface using a fundamental channel or a supplemental channel. 28. The invention of claim 27, wherein:functionality for controlling retransmission of forward-link data over the air interface is implemented at the data distribution function; andfunctionality for segmentation of new forward-link data for transmission over the air interface is implemented at the first base station. 29. The invention of claim 28, wherein functionality for physical layer framing, re-segmentation of retransmitted forward link data, error detection and correction of air interface transmissions, channel encoding, multiplexing of segmented new forward-link data and resegmented retransmitted forward-link data, multiplexing of multiple data streams of forward-link data, encryption, determination of air interface transmission rates for sharing bandwidth of the air interface among multiple data streams, and scheduling of transmissions of the forward-link data over the air interface is implemented at the first base station. 30. The invention of claim 24, wherein the assigned time tag is used to perform a reverse outer-loop power control function. 31. The invention of claim 24, wherein the time tag corresponds to a GPS time. 32. The invention of claim 24, wherein the sequence number for a particular reverse-link data packet is a function of the amount of data in all previous reverse-link data packets for the corresponding frame. 33. A wireless communications met hod, comprising the steps of:(a) receiving forward-link data at a data distribution function of a wireless communications system;(b) transmitting the forward-link data from the data distribution function to only a first base station of the wireless communications system; and(c) transmitting the forward-link data from the first base station over an air interface, wherein:functionality for controlling retransmission of forward-link data over the air interface is implemented at the data distribution function; andfunctionality for segmentation of new forward-link data for transmission over the air interface is implemented at the first base station. 34. The invention of claim 33, wherein functionality for physical layer framing, error detection and correction of air interface transmissions, channel encoding, and encryption for the forward-link data is implemented at the first base station. 35. The invention of claim 33, wherein the data distribution function transmits the forward-link data to the first base station in individually addressable data units. 36. The invention of claim 35, wherein each data unit corresponds to one byte of forward-link data. 37. A wireless communications system comprising a data distribution function in communication with a first base station, wherein:the data distribution function is configured to:(a) receive forward-link data; and(b) transmit the forward-link data to only the first base station; andthe first base station is configured to transmit the forward-link data over an air interface, wherein:functionality for controlling retransmission of forward-link data over the air interface is implemented at the data distribution function; andfunctionality for segmentation of new forward-link data for transmission over the air interface is implemented at the first base station. 38. The invention of claim 37, wherein functionality for physical layer framing, error detection and correction of air interface transmissions, channel encoding, and encryption for the forward-link data is implemented at the first base station. 39. The invention of claim 37, wherein the data distribution function transmits the forward-link data to the first base station in individually addressable data units. 40. The invention of claim 39, wherein each data unit corresponds to one byte of forward-link data. 41. A base station for a wireless communications system, wherein the base station is configured to:(a) receive forward-link data; and(b) transmit the forward-link data over an air interface, wherein functionality for segmentation of new forward-link data for transmission over the air interface is implemented at the first base station. 42. The invention of claim 41, wherein functionality for physical layer framing, error detection and correction of air interface transmissions, channel encoding, and encryption for the forward-link data is implemented at the first base station. 43. The invention of claim 41, wherein the base station receives the forward-link data in individually addressable data units. 44. The invention of claim 43, wherein each data unit corresponds to one byte of forward-link data. 45. The invention of claim 33, wherein functionality for resegmentation of retransmitted forward link data for transmission over the air interface is implemented at the base station. 46. The invention of claim 33, wherein functionality for multiplexing of segmented new forward-link data and resegmented retransmitted forward-link data for transmission over the air interface is implemented at the first base station. 47. The invention of claim 33, wherein functionality for multiplexing of multiple streams of forward-link data for transmission over the air interface is implemented at the first base station. 48. The invention of claim 33, wherein functionality for scheduling of transmissions over the air interface is implemented at the first base station. 49. The invention of claim 33, wherein functionality for determination of air interface transmission rates for sharing bandwidth of the air interface among multiple data streams is implemented at the first base station. 50. The invention of claim 37, wherein functionality for resegmentation of retransmitted forward link data for transmission over the air interface is implemented at the base station. 51. The invention of claim 37, wherein functionality for multiplexing of segmented new forward-link data and resegmented retransmitted forward-link data for transmission over the air interface is implemented at the first base station. 52. The invention of claim 37, wherein functionality for multiplexing of multiple streams of forward-link data for transmission over the air interface is implemented at the first base station. 53. The invention of claim 37, wherein functionality for scheduling of transmissions over the air interface is implemented at the first base station. 54. The invention of claim 37, wherein functionality for determination of air interface transmission rates for sharing bandwidth of the air interface among multiple data streams is implemented at the first base station. 55. The invention of claim 41, wherein functionality for resegmentation of retransmitted forward link data for transmission over the air interface is implemented at the base station. 56. The invention of claim 41, wherein functionality for multiplexing of segmented new forward-link data and resegmented retransmitted forward-link data for transmission over the air interface is implemented at the first base station. 57. The invention of claim 41, wherein functionality for multiplexing of multiple streams of forward-link data for transmission over the air interface is implemented at the first base station. 58. The invention of claim 41, wherein functionality for scheduling of transmissions over the air interface is implemented at the first base station. 59. The invention of claim 41, wherein functionality for determination of air interface transmission rates for sharing bandwidth of the air interface among multiple data streams is implemented at the first base station.