Apparatus and method for operating frequency resources in a mobile communication system

• US 7,768,987 B2
• Filed: 09/26/2006
• Issued: 08/03/2010
• Est. Priority Date: 09/26/2005
• Status: Expired due to Fees

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Rahman, Muhammad Imadur, Prasad, Ramjee, Lim, Eun-Taek, Park, Dong-Seek, Kim, Young-Kyun, Cho, Young-Kwon, Jung, Jun-Young, Reynisson, Ragnar Viôir, Koo, Jin-Kyu, Fitzek, Frank Hanns Paul
• Primary Examiner(s): Ngo; Ricky
• Assistant Examiner(s): KAO, WEI PO ERIC
• Application Number:
  US11/527,313
• Publication Number:
  US 20070093252A1
• Time in Patent Office: 1,407 Days
• Field of Search: 370/208, 370/252, 370/253, 370310-350, 370/431, 370/437, 370/450, 370/480, 370/485
• US Class Current: 370/344
• CPC Class Codes: H04B 1/7156 Arrangements for sequence synchronisation
• CPC Class Codes: H04L 1/0001 Systems modifying transmission characteristics according to link quality, e.g. power backoff adaptive data allocation for multicarrier modulation H04L5/0044; controlling transmission power for radio systems H04W52/04
• CPC Class Codes: H04L 1/0033 arrangements specific to the transmitter
• CPC Class Codes: H04L 5/0044 allocation of payload

Abstract

A frequency resource operating apparatus and method for transmitting and receiving data at a different hopping pattern speed according to a CSI in a BWA communication system are provided. In a method of transmitting and receiving data using CSI in a mobile communication system, a BS sets the CSI of an MS to an initial CSI and sends data to the MS according to the initial CSI. The MS sends a downlink CSI to the BS. The BS groups the MS based on the downlink CSI and sends data to the MS according to a hopping pattern for the group of the MS among hopping patterns preset for predetermined groups.

Claims

1. A method of transmitting and receiving data using Channel State Information (CSI) in a mobile communication system, comprising the steps of:

setting, by a Base Station (BS), the CSI of a Mobile Station (MS) to an initial CSI and transmitting data to the MS according to the initial CSI;

transmitting, by the MS, a downlink CSI to the BS;

setting, by the BS, a group of the MS based on the downlink CSI; and

transmitting, by the BS, data to the MS according to a frequency hopping pattern for the group of the MS among frequency hopping patterns preset for predetermined groups,

wherein the frequency hopping pattern for the group of the MS is determined according to whether coherence time measured by the MS runs over a preset time or a coherence bandwidth measured by the MS is greater than a threshold,

wherein the frequency hopping pattern for the group of the MS is generated according to a frequency hopping speed that is faster than a currently used frequency hopping speed on at least one of a band basis and a subcarrier basis, when the coherence time runs over the preset time or the coherence bandwidth is greater than the threshold.

2. The method of claim 1, wherein setting the group of the MS comprises setting the group of the MS to a group including other MSs with a same CSI.

3. The method of claim 1, wherein the downlink CSI is one among a plurality of CSIs determined based on the coherence time and the coherence bandwidth.

4. The method of claim 1, wherein the frequency hopping pattern for the group of the MS is generated according to a frequency hopping speed that is slower than the currently used frequency hopping speed on at least one of the band basis and the subcarrier basis, when the coherence time does not run over the preset time or the coherence bandwidth is not greater than the threshold.

5. A method of transmitting and receiving data using Channel State Information (CSI) in a mobile communication system, comprising the steps of:

receiving, by a Base Station (BS), a random access signal from at least one Mobile station (MS);

determining, by the BS, the CSI of the at least one MS to be an initial CSI and allocating frequency resources to the at least one MS based on the initial CSI;

transmitting, by the at least one MS, data using the allocated frequency resources to the BS;

measuring, by the BS, the CSI of the at least one MS operating based on the initial CSI;

resetting, by the BS, a group of the at least one MS according to the measured CSI;

allocating, by the BS, different frequency resources to the reset group of the at least one MS according to the CSI of the reset group; and

transmitting, by the BS, data to the at least one MS using a frequency hopping pattern for the reset group that is determined according to whether a coherence time measured by the at least one MS runs over a preset time or a coherence bandwidth measured by the at least one MS is greater than a threshold,

wherein transmitting data to the at least one MS comprises transmitting the data using a frequency hopping pattern that is determined according to a frequency hopping speed that is faster than a currently used frequency hopping speed on at least one of a band basis and a subcarrier basis, when the coherence time runs over the preset time or the coherence bandwidth is greater than the threshold.

6. The method of claim 5, wherein measuring the CSI comprises measuring the coherence time and the coherence bandwidth of the at least one MS.

7. The method of claim 5, wherein resetting the group of the at least one MS comprises resetting the group of the at least one MS to a group including MSs with a same CSI.

8. The method of claim 5, wherein the transmitting the data to the at least one MS comprises transmitting the data using different frequency hopping patterns for each group, based on a CSI of each group.

9. The method of claim 5, wherein transmitting the data to the at least one MS comprises transmitting the data using a frequency hopping pattern that is determined according to a frequency hopping speed that is slower than the currently used frequency hopping speed on least one of the band basis and the subcarrier basis, when the coherence time does not run over the preset time or the coherence bandwidth is not greater than the threshold.

10. A system for transmitting and receiving data using Channel State Information (CSI) in a mobile communication system, comprising:

a Base Station (BS) for grouping Mobile Stations (MSs) into predetermined groups according to CSIs of the MSs, applying different frequency hopping patterns to the groups according to the CSIs of the groups, and transmitting and receiving data to and from the MSs included in the groups using the frequency hopping patterns applied to the groups; and

an MS from among the MSs for transmitting and receiving data to and from the BS using a frequency hopping pattern applied to a group to which the MS belongs from among the groups,

wherein the frequency hopping pattern is determined according to whether a coherence time measured by the MS runs over a preset time or a coherence bandwidth measured by the MS is greater than a threshold,

wherein the frequency hopping pattern is generated according to a frequency hopping speed that is faster than a currently used frequency hopping speed on at least one of a band basis and a subcarrier basis, when the coherence time runs over the reset time or the coherence bandwidth is greater than the threshold.

11. The system of claim 10, wherein the BS comprises a transmitter for determining first frequency hopping patterns for the MSs according to the CSIs of the MSs, mapping subcarriers to a frequency area according to the first frequency hopping patterns, and changing frequency values according to second frequency hopping patterns corresponding to the CSIs.

12. The system of claim 10, wherein the BS comprises a receiver for receiving the CSIs of the MSs, applying first frequency hopping patterns according to the CSIs of the MSs, changing frequency values according to the first frequency hopping patterns, performing a baseband process according to the changed frequency values, and distinguishing signals from the MSs according to second frequency hopping patterns corresponding to the CSIs of the MSs.

13. The system of claim 10, wherein the MS comprises a transmitter for configuring a channel according to a decided first frequency hopping pattern, changing a frequency value according to a second frequency hopping pattern corresponding to the CSI of the MS, and transmitting data using the changed frequency value.

14. The system of claim 10, wherein the MS comprises a receiver for changing a frequency value according to a first frequency hopping pattern corresponding to a decided CSI, performing a baseband process according to the changed frequency value, and processing received data according to a second frequency hopping pattern corresponding to the CSI.

15. The system of claim, 10, wherein the frequency hopping pattern is generated according to a frequency hopping speed that is slower than the currently used frequency hopping speed on at least one of the band basis and the subcarrier basis, when the coherence time does not run over the preset time or the coherence bandwidth is not greater than the threshold.