Wireless repeater and method for managing air interface communications

• US 7,480,486 B1
• Filed: 12/19/2005
• Issued: 01/20/2009
• Est. Priority Date: 09/10/2003
• Status: Expired due to Term

• Current Assignee: Sprint Spectrum LLC (Deutsche Telekom AG)
• Original Assignee: Sprint Spectrum LP (Deutsche Telekom AG)
• Inventors: Asif, Saad Z., Oh, Dae-Sik, Yarkosky, Mark L.
• Primary Examiner(s): Appiah; Charles N
• Assistant Examiner(s): AJIBADE AKONAI, OLUMIDE
• Application Number:
  US11/311,819
• Time in Patent Office: 1,128 Days
• Field of Search: 455/436, 455/437, 455/438, 455/439, 455/442, 455/444, 455/11.1, 455/13.1, 455/13.4, 455/7, 455/8, 455/9, 455/522, 455/16, 455/17, 455/67.11, 455/67.13, 455/67.16, 455/450, 455/451, 455/452.1, 455/452.2, 455/509, 455/114.2, 455/441, 455/443, 455/445, 455/10, 455/561, 455/562, 455/15, 455/62, 455/63.3, 455/440, 370/395.1, 370/274, 370/279, 370/315, 370/501, 370/328, 370/329, 370/331
• US Class Current: 455/7
• CPC Class Codes: H04B 7/1555 Selecting relay station antenna mode, e.g. selecting omnidirectional -, directional beams, selecting polarizations

Abstract

A wireless repeater and method for managing air interface communications is provided. A repeater may include a donor antenna, a coverage antenna, a mobile station modem, a processor, and data storage. The donor antenna will receive a plurality of air interface beams on the forward link from a radio access network. The coverage antenna will pass each forward link beam received to a mobile station being served by the repeater. Further, the donor antenna will pass each forward link air interface beam to the MSM, where the MSM will apply a rake receiver to identify a signal characteristic of the forward link of each beam received, and the processor will record in the data storage the signal characteristic corresponding to each beam. Given this data, the repeater will select an air interface beam with the most preferable signal characteristic, and will keep only this beam active for reverse link communications.

Claims

1. In a wireless repeater, a method comprising:

communicating with a radio access network on a plurality of first air interface beams cooperatively defining a first air interface between the wireless repeater and the radio access network, wherein each first air interface beam defines a respective forward link and a respective reverse link, and wherein the forward link of each first air interface beam defines a respective signal characteristic;

communicating with at least one mobile station on a second air interface;

for each first air interface beam, passing communications received on the forward link of the first air interface beam along to the mobile station on the second air interface;

selecting a given one of the first air interface beams based on the signal characteristic of the forward link of the given first air interface beam; and

receiving reverse link communications from the mobile station on the second air interface, and passing the received reverse link communications to the radio access network on only the selected first air interface beam, while continuing to pass forward link communications from each first air interface beam to the mobile station.

2. The method of claim 1, wherein the signal characteristic comprises a carrier-to-cochannel interference ratio, and wherein selecting the given first air interface beam based on the signal characteristic of the forward link of the given first air interface beam comprises selecting the first air interface beam whose forward link has the highest carrier-to-cochannel interference ratio.

3. The method of claim 2, further comprising the wireless repeater determining the carrier-to-cochannel interference ratio respectively of the forward link of each first air interface beam, and comparing the carrier-to-cochannel interference ratio of the forward links of at least two of the first air interface beams in order to select the first air interface beam whose forward link has the highest carrier-to-cochannel interference ratio.

4. The method of claim 1, wherein the signal characteristic comprises a signal to noise ratio, and wherein selecting the given first air interface beam based on the signal characteristic of the forward link of the given first air interface beam comprises selecting the first air interface beam whose forward link has the highest signal to noise ratio.

5. The method of claim 4, further comprising the wireless repeater determining the signal to noise ratio respectively of the forward link of each first air interface beam, and comparing the signal to noise ratio of the forward links of at least two of the first air interface beams in order to select the first air interface beam whose forward link has the highest signal to noise ratio.

6. The method of claim 1, wherein the signal characteristic comprises a frame error rate, and wherein selecting the given first air interface beam based on the signal characteristic of the forward link of the given first air interface beam comprises selecting the first air interface beam whose forward link has the lowest frame error rate.

7. The method of claim 6, further comprising the wireless repeater determining the frame error rate respectively of the forward link of each first air interface beam, and comparing the frame error rate of the forward links of at least two of the first air interface beams in order to select the first air interface beam whose forward link has the lowest frame error rate.

8. The method of claim 1, wherein selecting the given first air interface beam comprises keeping the reverse link of the given first air interface beam active while deactivating the reverse links of the other first air interface beams.

9. The method of claim 1, wherein each first air interface beam corresponds with a respective sector of a radio access network.

10. The method of claim 1, further comprising subsequently handing off reverse link communications from the selected first air interface beam to another first air interface beam in response to a determination that the other first air interface beam has a preferable signal characteristic.

11. The method of claim 10, further comprising making the determination by comparing the signal characteristic of the forward link of the given first air interface beam with the signal characteristic of the forward link of the other first air interface beam.

12. The method of claim 10, wherein the signal characteristic is selected from the group consisting of carrier-to-cochannel interference ratio, signal to noise ratio, and frame error rate.

13. The method of claim 10, wherein handing off reverse link communications comprises performing a make-before-break handoff.

14. A wireless repeater comprising:

a donor antenna operable to communicate with a radio access network on a plurality of first air interface beams cooperatively defining a first air interface between the wireless repeater and the radio access network, wherein each first air interface beam defines a respective forward link and a respective reverse link, and wherein the forward link of each first air interface beam defines a respective signal characteristic;

a coverage antenna operable to communicate with at least one mobile station on a second air interface; and

a mobile station modem,

wherein the donor antenna receives communications on the forward link of each first air interface beam and passes the communications to the mobile station modem,

wherein, for each first air interface beam, the coverage antenna passes communications received from the mobile station modem along to the mobile station on the second air interface,

wherein the wireless repeater selects a given one of the first air interface beams based on the signal characteristic of the forward link of the given first air interface beam, and

wherein the wireless repeater receives reverse link communications from the mobile station on the second air interface, and passes the received reverse link communications to the radio access network on only the selected first air interface beam, while continuing to pass forward link communications from each first air interface beam to the mobile station.

15. The wireless repeater of claim 14, wherein the mobile station modem identifies the signal characteristic of the forward link of each first air interface beam.

16. The wireless repeater of claim 15, wherein the signal characteristic comprises carrier-to-cochannel interference ratio.

17. The wireless repeater of claim 15, wherein the signal characteristic comprises signal to noise ratio.

18. The wireless repeater of claim 15, wherein the signal characteristic comprises frame error rate.

19. The wireless repeater of claim 14, further comprising a processor operable to determine and record in data storage the signal characteristic of the forward link of each first air interface beam and, based on the signal characteristic, to select the given first air interface beam.

20. The wireless repeater of claim 14, wherein the donor antenna comprises a phased array antenna, and wherein, based on the signal characteristic of each beam, a processor directs the phased array antenna to communicate on the given first air interface beam.