Ranging regions for wireless communication relay stations
View Patent ↗One embodiment of the present invention provides a unique ranging technique in wireless communication environments that employ relay stations associated with a base station. Each relay station, and optionally the base station itself, can be allocated a unique ranging region having unique ranging resources that may be used by a mobile station to initiate a ranging function with the corresponding relay station or base station.
1. A relay station to be associated with a base station and a member relay station comprising:
transmit and receive circuitry configured to facilitate wireless communications with the base station and a mobile station; and
a control system associated with the transmit and receive circuitry and configured to:
identify a first ranging region within an overall ranging region to use for a first ranging function, wherein the member relay station uses a second ranging region within the overall ranging region for the ranging function; and
detect a first ranging code transmitted by the mobile station via first ranging resources within the first ranging region;
process the first ranging code to facilitate the first ranging function, wherein different ranging codes are provided for each of the first and second ranging regions; and
ignore ranging codes transmitted by the mobile station via ranging resources outside of the first ranging region for the first ranging function.
2. The relay station of claim 1 wherein in response to detecting the ranging code, the control system is further configured to:
obtain transmission adjustments for the mobile terminal to use when transmitting information to the relay station; and
send the transmission adjustments to the mobile station.
3. The relay station of claim 2 wherein the control system is further configured to provide transmission adjustment recommendations, which are used to determine the transmission adjustments for the mobile terminal.
4. The relay station of claim 3 wherein to obtain the transmission adjustments, the control system is further configured to:
determine transmission adjustment recommendations;
send code information including or identifying the first ranging code and the transmission adjustment recommendations to the base station; and
receive the transmission adjustments from the base station.
5. The relay station of claim 4 wherein the control system is further configured to send a mobile station identifier and information identifying the first ranging resources or the first ranging region along with the code information and the transmission adjustment recommendations to the base station.
6. The relay station of claim 3 wherein the control system determines the transmission adjustments based on the transmission adjustment recommendations.
7. The relay station of claim 3 wherein the transmission adjustment recommendations bear on one of a group consisting of transmission time, transmission frequency, and transmission power associated with transmission of the first ranging code.
8. The relay station of claim 1 wherein the base station uses a third ranging region within the overall ranging region for the first ranging function.
9. The relay station of claim 1 wherein the first and second ranging regions have common ranging codes, including the first ranging code, that can be assigned to the mobile station.
10. The relay station of claim 1 wherein the wireless communications with the mobile station are provided using orthogonal frequency division multiplexing, the first ranging region comprises a first group of sub-carriers within a transmit frame, and the second ranging region comprises a second group of sub-carriers within the transmit frame.
11. The relay station of claim 1 wherein ranging resources of the first ranging region are orthogonal to ranging resources of the second ranging region.
12. The relay station of claim 1 wherein the ranging function is an initial ranging function provided prior to the mobile station initiating data or voice communications via the relay station.
13. The relay station of claim 1 wherein the ranging function is a periodic ranging function provided while the mobile station is engaged in data or voice communications via the relay station.
14. The relay station of claim 1 wherein the ranging function is a handoff ranging function provided while the mobile station is engaged in a handoff procedure to transition from the relay station to the member relay station.
15. The relay station of claim 1 wherein the ranging function is a handoff ranging function provided while the mobile station is engaged in requesting additional bandwidth from the relay station.
16. The relay station of claim 1 wherein the control system is further configured to ignore ranging codes transmitted by the mobile station via ranging resources of the second ranging region for the ranging function.
17. The relay station of claim 1 wherein to identify the first ranging region, the control system is configured to receive a message from the base station, which allocates the first ranging region to the first relay station and a second ranging region to the second relay station.
18. A base station to be associated with a plurality of relay stations for facilitating wireless communications with a mobile station, the base station comprising:
transmit and receive circuitry configured to facilitate wireless communications with the plurality of relay stations and the mobile station; and
a control system associated with the transmit and receive circuitry and configured to:
for each relay station of the plurality of relay stations, identify a unique ranging region within an overall ranging region to use for a first ranging function;
receive a code grab message from a first relay station of the plurality of relay stations, the code grab message comprising transmission adjustment recommendations and a first ranging code or an identifier of the first ranging code that was received by the first relay station and transmitted by the mobile station via first ranging resources within a first ranging region of a plurality of ranging regions;
process the first ranging code to facilitate the first ranging function, wherein different ranging codes are provided for each of the first and second ranging regions;
identify for the base station a unique base station ranging region within an overall ranging region to use for the first ranging function, such that each of the plurality of relay stations and the base station are allocated different ranging regions for the ranging function; and
ignore ranging codes transmitted by the mobile station via ranging resources outside of the unique base station ranging region allocated for the base station.
19. The base station of claim 18 further comprising sending a message to each of the plurality of relay stations to allocate the unique ranging region for each of the plurality of relay stations.
20. The base station of claim 18 wherein to process the first ranging code, the control system is further configured to:
determine transmission adjustments for the mobile station to use when transmitting information to the first relay station; and
send the transmission adjustments to the first relay station for delivery to the mobile station.
21. The base station of claim 20 wherein the control system is further configured to:
detect a second ranging code transmitted by the mobile station via second ranging resources within a base station ranging region;
in response to detecting the second ranging code, determine transmission adjustments for the mobile terminal to use when transmitting information to the relay station; and
send the transmission adjustments to the mobile station.
22. The base station of claim 18 wherein the code grab message further comprises a mobile station identifier and information identifying the first ranging resources or the first ranging region.
23. The base station of claim 18 wherein the transmission adjustment recommendations bear on one of a group consisting of transmission time, transmission frequency, and transmission power associated with transmission of the first ranging code.
24. The base station of claim 18 wherein ranging resources of each of the plurality of ranging regions are orthogonal to one another.
25. The base station of claim 18 wherein the ranging function is an initial ranging function provided prior to the mobile station initiating data or voice communications via one of the plurality of relay stations.
26. The base station of claim 18 wherein the ranging function is a periodic ranging function provided while the mobile station is engaged in data or voice communications via the relay station.
27. The base station of claim 18 wherein the ranging function is a handoff ranging function provided while the mobile station is engaged in a handoff procedure to transition from one of the plurality of relay stations to another of the plurality of relay stations.
28. The base station of claim 18 wherein the ranging function is a handoff ranging function provided while the mobile station is engaged in requesting additional bandwidth from one of the plurality of relay stations.
29. The base station of claim 18 wherein each of the plurality of ranging regions have common ranging codes that can be assigned to the mobile station.
30. The base station of claim 18 wherein the wireless communications with the mobile station are provided using orthogonal frequency division multiplexing, and each of the plurality of ranging regions comprise unique groups of sub-carriers within a transmit frame.