In-band wireless communication network backhaul

• US 20040062214A1
• Filed: 09/27/2002
• Published: 04/01/2004
• Est. Priority Date: 09/27/2002
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Schnack, Larry, Olps, Darrell, Wolfe, Charles
• Granted Patent: US 7,321,571 B2
• Time in Patent Office: Days
• US Class Current: 370/315
• CPC Class Codes: H04B 7/2606 Arrangements for base station coverage control, e.g. by using relays in tunnels
• CPC Class Codes: H04W 28/16 Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 92/20 between access points

Abstract

By using allocated spectrum from the mobile station air interface, one or more remote, child access points within a wireless communication network establish backhaul connections to a parent access point having conventional backhaul links to the network. In this manner, backhaul traffic is carried on the standard air interface coexistent with the normal mobile station traffic. Such an arrangement permits parent and child access points to use the standard air interface for both conventional mobile station traffic, as well as backhaul traffic. In an exemplary embodiment, a wireless cellular communication network establishes backhaul connections between one or more child Radio Base Stations (RBSs) and a parent RBS using one or more of the data channels defined by the network'"'"'s air interface.

Claims

1. A method of transferring backhaul traffic between first and second radio base stations (RBSs) in a wireless communication network comprising:

allocating at least one channel at the first and second RBSs from a wireless communication air interface used by the RBSs to support communication with mobile stations; and

transferring backhaul traffic between the first and second RBSs on the at least one allocated channel.

2. The method of claim 1, wherein allocating at least one channel at the first and second RBSs comprises allocating a packet data channel defined by the air interface.

3. The method of claim 2, wherein transferring backhaul traffic between the first and second RBSs comprises transferring a combination of mobile station traffic and network signaling on the packet data channel.

4. The method of claim 3, wherein transferring the combination of mobile station traffic and network signaling on the packet data channel comprises multiplexing a plurality of mobile station traffic streams together with network signaling data into a combined backhaul stream for transmission by the first RBS to the second RBS via the packet data channel.

5. The method of claim 4, wherein the second RBS is a parent RBS having a primary backhaul link to a Base Station Controller, and further comprising:

receiving the combined backhaul stream at the parent RBS;

recovering the plurality of mobile station traffic streams from the combined backhaul stream; and

transferring the recovered mobile station traffic streams to the BSC via the primary backhaul link.

6. The method of claim 4, wherein the second RBS is a child RBS, and further comprising:

receiving the combined backhaul stream at the child RBS;

extracting mobile station traffic streams from the combined backhaul stream that are targeted to mobile stations supported by the child RBS; and

transmitting the extracted mobile station traffic streams to the mobile stations supported by the child RBS on one or more other channels of the air interface.

7. The method of claim 6, further comprising extracting network signaling data targeted to the child RBS from the combined backhaul stream, and processing the extracted network signaling data at the child RBS.

8. The method of claim 7, wherein the extracted network signaling data includes overhead channel data extracted from the combined backhaul stream, and further comprising transmitting the extracted overhead channel data from the child RBS.

9. The method of claim 4, wherein the second RBS is a child RBS, and further comprising:

receiving the combined backhaul stream at the child RBS, wherein the backhaul stream comprises data targeted to the child RBS and data targeted to one or more subsequent child RBSs;

extracting the data targeted to the child RBS from the combined backhaul stream; and

relaying the data targeted to the one or more subsequent child RBSs as another combined backhaul stream transmitted on another channel of the air interface.

10. The method of claim 4, wherein the first and second RBSs are child RBSs, and further comprising:

transmitting the combined backhaul stream from the first RBS to the second RBS as a combination of network signaling data and mobile station traffic from the first RBS;

receiving the combined backhaul stream at the second RBS and adding network signaling data and mobile station traffic from the second RBS to the combined backhaul stream; and

transmitting the combined backhaul stream to a parent RBS having a primary backhaul connection to a Base Station Controller (BSC).

11. The method of claim 4, further comprising demultiplexing the plurality of mobile station traffic streams from the packet data channel at the second RBS for transmission over the air interface by the second RBS to one or more mobile stations supported by the second RBS.

12. The method of claim 4, wherein multiplexing a plurality of mobile station traffic streams comprises multiplexing a plurality of voice data streams.

13. The method of claim 4, wherein multiplexing a plurality of mobile station traffic streams comprises multiplexing a plurality of packet data streams.

14. The method of claim 1, further comprising selecting one of a forward link and a reverse link for transferring the backhaul traffic based on a relative availability of traffic capacity among the forward and reverse links, wherein the forward and reverse links are defined by the air interface.

15. The method of claim 1, wherein transferring backhaul traffic between the first and second RBSs comprises:

receiving backhaul traffic from the network on a primary backhaul connection at the first RBS;

formatting the received backhaul traffic as forward backhaul traffic for transmission from the first RBS to the second RBS via the air interface;

receiving mobile station traffic at the second RBS from mobile stations supported by the second RBS; and

formatting the received mobile station traffic as reverse backhaul traffic for transmission from the second RBS to the first RBS via the air interface.

16. The method of claim 15, further comprising transmitting the reverse backhaul traffic to the first RBS from a directional backhaul antenna coupled to the second RBS.

17. The method of claim 16, further comprising receiving the reverse backhaul traffic at the first RBS on a primary antenna used by the first RBS for mobile station communication.

18. The method of claim 15, further comprising transmitting the reverse backhaul traffic to the first RBS from a primary antenna used by the second RBS for mobile station communication.

19. The method of claim 18, further comprising receiving the reverse backhaul traffic at the first RBS on a directional backhaul antenna coupled to the first RBS.

20. The method of claim 15, further comprising transmitting the forward backhaul traffic to the second RBS from a direction antenna coupled to the first RBS.

21. The method of claim 20, further comprising receiving the forward backhaul traffic at the second RBS on a primary antenna used by the second RBS for mobile station communication.

22. The method of claim 15, further comprising transmitting the forward backhaul traffic to the second RBS from a primary antenna used by the first RBS for mobile station communication.

23. The method of claim 22, further comprising receiving the forward backhaul traffic at the second RBS on a directional backhaul antenna coupled to the second RBS.

24. The method of claim 1, wherein transferring backhaul traffic between the first and second RBSs comprises:

receiving forward backhaul traffic at the first RBS transmitted from a third RBS in the network;

relaying the forward backhaul traffic from the first RBS to the second RBS;

receiving reverse backhaul traffic at the first RBS transmitted from the second RBS; and

relaying the reverse backhaul traffic from the second RBS to the third RBS.

25. The method of claim 1, further comprising relaying backhaul traffic between the first RBS and a third RBS by relaying the backhaul traffic through the second RBS via the air interface.

26. The method of claim 1, wherein allocating at least one channel at the first and second RBSs from the wireless communication air interface comprises allocating at least one first channel at the first RBS, and allocating at least one second channel at the second RBS.

27. The method of claim 26, further comprising selecting at least one of the first and second channels from a set of forward link channels or from a set of reverse link channels depending upon the relative capacity utilization of the forward and reverse links comprising the wireless communication air interface.

28. The method of claim 27, further comprising transmitting backhaul traffic on one or more allocated forward link channels if forward link capacity is less utilized than reverse link capacity, and transmitting backhaul traffic on one or more allocated reverse link channels if reverse link capacity is less utilized than forward link capacity.

29. A method of transferring backhaul traffic between first and second radio base stations in a wireless communication network, said method comprising:

allocating at least one channel from a mobile station air interface as an extended backhaul connection to carry backhaul traffic between said first and second base stations;

receiving reverse mobile station traffic at said first base station from one or more mobile stations;

generating reverse backhaul traffic including said reverse mobile station traffic;

transmitting said reverse backhaul traffic over said extended backhaul connection to said second base station;

receiving forward backhaul traffic at said first base station from said second base station over said extended backhaul connection;

extracting forward mobile station traffic from said forward backhaul traffic; and

transmitting said forward mobile station traffic backhaul traffic to said one or more mobile stations.

30. The method of claim 29, wherein allocating at least one channel from a mobile station air interface comprises allocating a data channel available at the second base station from a set of data channels defined by the air interface.

31. The method of claim 30, wherein allocating a data channel available at the second base station comprises allocating one of a forward link or a reverse link data channel available at the second base station.

32. The method of claim 29, wherein generating reverse backhaul traffic from said reverse mobile station traffic comprises multiplexing the mobile station traffic with network signaling data into combined data for transmission to the second base station as the reverse backhaul traffic on the extended backhaul connection.

33. The method of claim 29, wherein receiving forward backhaul traffic at said first base station from said second base station over said extended backhaul connection comprises receiving the forward backhaul traffic as multiplexed mobile station traffic and network signaling data.

34. The method of claim 33, wherein extracting forward mobile station traffic from said forward backhaul traffic comprises demultiplexing the multiplexed mobile station traffic for transmission to individual ones of the mobile stations as forward mobile station traffic.

35. A method of transferring backhaul traffic between first and second radio base stations in a wireless communication network, said method comprising:

allocating at least one channel from a mobile station air interface as an extended backhaul connection to carry backhaul traffic between said first and second base stations;

receiving reverse backhaul traffic at said first base station from said second base station;

combining said reverse backhaul traffic received from said second base station with reverse backhaul traffic generated at said first base station;

transmitting said combined backhaul traffic from said first base station to a base station controller;

receiving combined forward backhaul traffic at said first base station for said first and second base stations;

separating at said first base station the forward backhaul traffic for said second base station from said forward backhaul traffic for said second base station; and

transmitting said forward backhaul traffic for said second base station from said first base station to said second base station over said extended backhaul connection.

36. The method of claim 35, wherein allocating at least one channel from a mobile station air interface comprises allocating a data channel defined by the air interface and available at the first and second base stations for transmission of reverse backhaul traffic from the second base station to the first base station.

37. The method of claim 35, wherein allocating at least one channel from a mobile station air interface comprises allocating a data channel defined by the air interface and available at the first and second base stations for transmission of forward backhaul traffic from the first base station to the second base station.

38. The method of claim 35, wherein receiving reverse backhaul traffic at said first base station from said second base station comprises receiving multiplexed reverse mobile station traffic and network signaling data from the second base station as the reverse backhaul traffic.

39. The method of claim 38, wherein combining said reverse backhaul traffic received from said second base station with reverse backhaul traffic generated at said first base station comprises combining the multiplexed reverse mobile station traffic and network signaling data from the second base station with reverse mobile station traffic from mobile stations supported by the first base station and network signaling data from the first base station to form the combined backhaul traffic.

40. The method of claim 35, wherein transmitting said combined backhaul traffic from said first base station to a base station controller comprises sending the combined backhaul traffic over a dedicated backhaul link existent between the first base station and the base station controller.

41. The method of claim 35, wherein receiving combined forward backhaul traffic at said first base station for said first and second base stations comprises receiving first forward backhaul traffic targeted to the the first base station and second forward backhaul traffic targeted to the second base station.

42. The method of claim 41, wherein separating at said first base station the combined forward backhaul traffic comprises separating the first and second forward backhaul traffic.

43. The method of claim 42, wherein separating the first and second forward backhaul traffic comprises multiplexing the separated second forward backhaul traffic onto the one or more data channels allocated from the air interface for transmission to the second base station.

44. A radio base station for use in a wireless communication network comprising:

first transceiver resources to transmit and receive backhaul traffic to and from a second radio base station in the network using one or more channels allocated from a mobile station air interface;

second transceiver resources to transmit and receive mobile station traffic to and from mobile stations using one or more channels of the air interface not allocated to the backhaul traffic;

a transceiver processor to process the mobile station traffic transmitted and received by the second transceiver resources; and

a backhaul processor to process the backhaul traffic transmitted and received by the first transceiver resources.

45. The radio base station of claim 44, wherein the radio base station further comprises a primary antenna coupled to at least the second transceiver resources to transmit and receive mobile station traffic.

46. The radio base station of claim 45, wherein the radio base station further comprises a backhaul module including a secondary antenna and a transmit portion of the first transceiver resources to transmit backhaul traffic to said second base station.

47. The radio base station of claim 46, wherein said first transceiver resources and said second transceiver resources include shared receiver resources.

48. The radio base station of claim 46, wherein said first transceiver resources and said second transceiver resources include shared transmitter resources.

49. The radio base station of claim 46, wherein the secondary antenna is a directional transmit antenna to reduce interference between air interface transmissions from the secondary antenna and air interface transmissions from the primary antenna.

50. The radio base station of claim 45, wherein the radio base station further comprises a backhaul module including a secondary antenna and a receive portion of the first transceiver resources to receive backhaul traffic from said second base station.

51. The radio base station of claim 44, wherein the first and second transceiver resources comprise shared transceiver resources, and wherein the radio base station further comprises a primary antenna used by the shared transceiver resources to transmit and receive both backhaul traffic and mobile station traffic.

52. The radio base station of claim 51, wherein the backhaul processor is coupled to the transceiver processor, which is in turn coupled to the shared transceiver resources, and wherein the backhaul processor generates mobile station traffic for transmission to one or more mobile stations based on processing backhaul traffic received through the primary antenna.

53. The radio base station of claim 51, wherein the backhaul processor generates backhaul traffic for transmission to the second radio base station via the primary antenna based on mobile station traffic received through the primary antenna.

54. The radio base station of claim 44, wherein the radio base station is a parent radio base station and the second radio base station is a child radio base station, and wherein the parent radio base station further comprises a primary backhaul interface communicatively coupling the parent radio base station to a supporting Base Station Controller (BSC).

55. The radio base station of claim 54, wherein the primary backhaul interface receives first backhaul traffic from the BSC destined for mobile stations supported by the parent radio base station and second backhaul traffic destined for the child radio base station and mobile stations supported by the child radio base station.

56. The radio base station of claim 55, wherein the parent radio base station generates mobile station traffic from the first backhaul traffic, generates forward backhaul traffic from the second backhaul traffic, and transmits said second backhaul traffic to the child radio base station via the air interface.

57. The radio base station of claim 56, wherein the second backhaul traffic includes a plurality of mobile station traffic streams and network signaling data, and wherein the parent radio base station generates the forward backhaul traffic by multiplexing the plurality of mobile station traffic streams and the network signaling data onto one or more allocated packet data channels.

58. The radio base station of claim 54, wherein the parent radio base station generates primary backhaul traffic for transmission to the base station controller via the primary backhaul interface by processing mobile station traffic received at the parent base station and by processing reverse backhaul traffic received from the child radio base station.

59. The radio base station of claim 54, wherein the reverse backhaul traffic received by the parent radio base station from the child radio base station comprises multiplexed data streams from a plurality of mobile stations and network signaling data, and wherein the parent radio base station processes the reverse backhaul traffic by demultiplexing the data streams and network signaling data.

60. The radio base station of claim 44, wherein the radio base station allocates one or more packet data channels from the air interface for the backhaul traffic.

61. The radio base station of claim 60, wherein the radio base station comprises a cdma2000 radio base station, and uses one or more supplemental packet data channels (SCH) to carry backhaul traffic.

62. The radio base station of claim 44, wherein the radio base station is a parent radio base station supporting one or more child radio base stations, and wherein the parent radio base station multiplexes mobile station traffic and network signaling data onto the one or more channels allocated from the air interface for transmission to the one or more child radio base stations as forward backhaul traffic.

63. The radio base station of claim 44, wherein the radio base is a child radio base station transferring reverse backhaul traffic to a parent radio base station, and wherein the child radio base station multiplexes mobile station traffic and network signaling data onto the one or more channels allocated from the air interface for transmission to the parent radio base station as reverse backhaul traffic.

64. The radio base station of claim 63, wherein the child radio base station receives reverse backhaul traffic from one or more additional child RBSs and relays that received backhaul traffic as part of the reverse backhaul traffic sent to the parent radio base station.