CENTRALIZED-SCHEDULER RELAY STATION FOR MMR EXTENDED 802.16E SYSTEM

• US 20080108355A1
• Filed: 05/04/2007
• Published: 05/08/2008
• Est. Priority Date: 11/03/2006
• Status: Abandoned Application

• Current Assignee: Fujitsu Semiconductor Limited (Fujitsu Limited)
• Original Assignee: Fujitsu Limited
• Inventors: OLESZCSUK, Antoni
• Application Number:
  US11/744,305
• Publication Number:
  US 20080108355A1
• Time in Patent Office: Days
• US Class Current: 455/442
• CPC Class Codes: H04B 7/2606 Arrangements for base station coverage control, e.g. by using relays in tunnels
• CPC Class Codes: H04W 16/26 Cell enhancers or enhancement, e.g. for tunnels, building shadow
• CPC Class Codes: H04W 72/1263 Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
• CPC Class Codes: H04W 84/047 using dedicated repeater stations

Abstract

Centralized scheduling of service flows from a base station to a plurality of stations in a multi-hop mobile relay system is accomplished by a centralized scheduler disposed in the base station. The centralized scheduler schedules the service flows by determining a frequency and a timeslot in which a relay station may re-transmit service flows that the base station sends to the relay station to be retransmitted to a mobile station or in the other direction, from a mobile station to the base station via a relay station. The centralized scheduler also transmits control messages including the frequency and the timeslot in which the relay station may re-transmit the service flows. The relay station receives the service flows in the form of bursts of data packets from the base station or from a mobile station. The relay station having a physical layer that encodes and decodes the data packets up to a media access control level. The relay station re-transmitting the data packets to the mobile station or to the base station at the frequency and in the timeslot determined by the base station and included in the control messages.

Claims

1. A multi-hop mobile relay system with a centralized scheduler, comprising a base station and a relay station, in which the centralized scheduler resides on the base station and controls scheduling on the relay station of service flows on the relay station.

2. The multi-hop relay system of claim 1, wherein the centralized scheduler controls scheduling of the service flows by determining a frequency and a timeslot in which the relay station transmits the service flows.

3. A method of centralized scheduling of a multi-hop mobile relay system from a base station, comprising:

providing a centralized scheduler on the base station; and

centrally scheduling service flows on a relay station using the centralized scheduler on the base station.

4. The method of claim 3, wherein the centralized scheduling of the service flows includes transmitting the service flows between a mobile station and the base station via the relay station.

5. The method of claim 3, wherein the centralized scheduling of the service flows includes determining a frequency and a timeslot in which the relay station transmits the service flows using the centralized scheduler on the base station.

6. The method of claim 3, wherein the centralized scheduling of the service flows includes transmitting control messages necessary to control a mobile station from the centralized scheduler on the base station to the relay station.

7. The method of claim 3, wherein the centralized scheduling of the service flows includes passing signal measurement metrics of uplink bursts received from a mobile station by the relay station to the centralized scheduler on the base station.

8. The method of claim 3, wherein the centralized scheduling of the service flows includes creating a downlink burst profile, an uplink burst profile, a downlink map, and an uplink map for the relay station at the centralized scheduler on the base station.

10. The method of claim 3, wherein the relay station is selected from the group consisting of a synchronous frame relay station and an asynchronous frame relay station.

11. The method of claim 3, wherein the centralized scheduling of the service flows includes translating service flows from the centralized scheduler on the base station at the relay station from a first encoding to a second encoding, and transmitting the service flows to a mobile station.

12. The method of claim 3, wherein the relay station relies on the centralized scheduler on the base station to schedule service flows and set attributes of the service flows.

13. The method of claim 3, wherein the relay station shares a radio channel with the base station.

14. The method of claim 3, wherein the relay station transmits and receives the service flows at different times.

15. The method of claim 3, wherein the centralized scheduling of the service flows includes reserving a frame space for downlink and uplink communications with mobile stations at the relay station using the centralized scheduler on the base station.

16. The method of claim 3, wherein the service flows are encoded and decoded at a physical layer of the relay station.

17. The method of claim 3, wherein the centralized scheduling of the service flows includes passing ranging messages between a mobile station and the relay station.

9. The method of claim 31 wherein the centralized scheduling of the service flows includes determining a zone and a segment to be used for the service flows by the relay station and a mobile station using the centralized scheduler on the base station.

18. A system of centralized scheduling of a multi-hop mobile relay system from a base station, comprising:

means for scheduling service flows centrally from a base station; and

means for controlling the service flows on a relay station according to the scheduling.

19. A system for centralized scheduling of service flows from a base station to a plurality of stations in a multi-hop mobile relay system, comprising:

a centralized scheduler disposed in the base station, the centralized scheduler scheduling the service flows by determining a frequency and a timeslot in which a relay station may re-transmit service flows that the base station sends to the relay station to be retransmitted to a mobile station, the centralized scheduler also transmitting control messages including the frequency and the timeslot in which the relay station may re-transmit the service flows;

the relay station receiving the service flows in the form of bursts of data packets from the base station, the relay station having a physical layer encoding and decoding the data packets up to a media access control level, and the relay station re-transmitting the data packets to the mobile station at the frequency and in the timeslot determined by the base station and included in the control messages.