Method for allocating resources in a wireless communication system

• US 20070049283A1
• Filed: 08/22/2006
• Published: 03/01/2007
• Est. Priority Date: 08/22/2005
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Eung-Sun, Kim, Yung-Soo, Kwun, Jong-Hyung, You, Cheol-Woo
• Granted Patent: US 7,796,997 B2
• Time in Patent Office: Days
• US Class Current: 455/450
• CPC Class Codes: H04W 48/12 using downlink control channel
• CPC Class Codes: H04W 72/51 based on terminal or device properties

Abstract

Disclosed is a cellular-based wireless communication system, and more particularly a method for allocating resources for data transmission in a cellular-based wireless communication system employing a multicarrier scheme. Frequency resources are divided into time slots defined by one frame and the divided time slots are allocated to an uplink and the downlink. During a predetermined time period, the frequency resources are allocated as resources for transmitting sync preambles. During a next predetermined time period, the frequency resources are allocated in such a manner that the frequency resources for sectors are successively and repeatedly used as resources for transmitting broadcasting messages on a sector-by-sector basis. In the remaining time slots, except the time slots for transmitting the preambles and the broadcasting messages, the frequency resources are allocated as resources for transmitting channel estimation midambles for dynamic channel allocation.

Claims

1. A method for allocating resources for a downlink in a cellular-based wireless communication system in which frequency resources are divided into time slots defined by one frame and the divided time slots are allocated to an uplink and the downlink, a multicarrier scheme is used, and one cell consists of a plurality of sectors, the method comprising the steps of:

allocating during a predetermined time period from a starting point of the time slots the frequency resources as resources for transmitting synchronization (sync) preambles on a sector-by-sector basis, the sync preambles using different specific frequencies having a regular interval for frame synchronization such that the plurality of sectors have mutual orthogonality;

allocating during a predetermined time period from an end point of the time slots the frequency resources in such a manner that the frequency resources for the plurality of sectors are repeatedly used, according to an order of the sectors, as resources for transmitting broadcasting messages on a sector-by-sector basis; and

defining an arbitrary time slot in the remaining time slots except the time slots in which the preambles and the broadcasting messages are transmitted, and allocating the frequency resources in the defined time slot as resources for transmitting channel estimation midambles including information for dynamic channel allocation.

2. The method as claimed in claim 1, wherein the same resources as the resources for transmitting the sync preambles on a sector-by-sector basis are allocated as the frequency resources for transmitting the broadcasting messages.

3. The method as claimed in claim 2, wherein the frequency resources for transmitting the broadcasting messages are used as resources for a terminal located at a cell edge.

4. The method as claimed in claim 1, wherein the channel estimation midambles separately defined for each of the plurality of sectors, all of the frequency resources are divided in half when the number of the sectors is an even number, each of the halved frequency resources is classified into patterns, the number of patterns corresponds to half of the number of the sectors, and the channel estimation midambles discriminated according to the halved frequencies and the patterns are allocated to and used in the respective sectors.

5. A method for receiving resources allocated for a downlink in a cellular-based wireless communication system in which frequency resources are divided into time slots defined by one frame and the divided time slots are allocated to an uplink and the downlink, a multicarrier scheme is used, one cell consists of a plurality of sectors, and cells different in number of sectors are mixed-used, the method comprising the steps of:

allocating during a predetermined time period from a starting point of the time slots the frequency resources as resources for transmitting synchronization (sync) preambles on a sector-by-sector basis, the sync preambles using different specific frequencies having a regular interval for frame synchronization such that the plurality of sectors have mutual orthogonality;

when a cell consisting of N sectors is used together with a cell consisting of 2N sectors, corresponding pairs of two neighbor sectors of the cell consisting of the 2N sectors are used in the cell consisting of the N sectors, and allocating the frequency resources such that if an interval of the frequency resources allocated as the sync preambles for the 2N sectors is 2N, an interval of the frequency resources allocated as the sync preambles for the N sectors becomes N coincide with the sync preambles for the 2N sectors;

receiving the sync preambles at a terminal;

correlating all of the received sync preambles, and comparing positions and values for peaks of the sync preambles with each other;

if each position difference and each value difference between any two consecutive peaks are less than those for the sync preambles for the N sectors, performing CRC checks for the N sectors;

if no error occurs in the CRC checks for the N sectors, determining, that the terminal is in one of the N sectors;

if errors occur in the CRC checks for the N sectors, performing CRC checks for the 2N sectors;

if no error occurs in the CRC checks for the 2N sectors, determining, that the terminal is in one of the 2N sectors; and

if errors occur in the CRC checks for the N sectors, determining the terminal as incapable of reception.

6. The method as claimed in claim 5, further comprising the step of:

if each position difference and each value difference between the two consecutive peaks are greater than those for the sync preambles for the N sectors, performing CRC checks for the 2N sectors.