Control system and multiple access method in wireless communication system

• US 7,903,619 B2
• Filed: 10/15/2007
• Issued: 03/08/2011
• Est. Priority Date: 07/31/2003
• Status: Expired due to Fees

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Yung-Boo, Kim, Ki-Ho, Yun, Sang-Boh
• Primary Examiner(s): Le; Danh C
• Application Number:
  US11/872,502
• Publication Number:
  US 20080037672A1
• Time in Patent Office: 1,240 Days
• Field of Search: 370/337, 370/344, 370/208, 455/450
• US Class Current: 370/337
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04W 74/02 Hybrid access
• CPC Class Codes: H04W 76/10 Connection setup

Abstract

A multiple access method in a wireless communication system using a plurality of multiple access techniques is provided. When a call is established with a wireless terminal, the terminal transmits a duplexing mode determination factor to the base station to set a time or frequency division duplexing mode for reverse transmission and determine access and hopping modes according to each of the division duplexing modes, and establishes forward and reverse channels according to the set time or frequency division duplexing mode for reverse transmission to communicate with the base station. The base station receives the duplexing mode determination factor from the terminal, sets a time or frequency division duplexing mode for reverse transmission and sets a time division duplexing mode for forward transmission based on the received factor, and determines frequency hopping and multiple access modes to communicate with the terminal according to the determined frequency and multiple access modes.

Claims

1. A method for transmitting and receiving data by a base station for communication with a wireless terminal using an OFDMA scheme, the method comprising the steps of:

determining a data transmission period using the OFDMA scheme;

determining a time interval for a forward link, a time interval for a reverse link and a switching time between the two time intervals in the data transmission period;

allocating time slots for data transmission in the forward link, included in the time interval for the forward link, to wireless terminals located in local and remote areas of the base station in a decreasing order of distances of the wireless terminals from the base station;

allocating time slots for data reception in the revere link, included in the time interval for the reverse link, to wireless terminals located in the local and remote areas in an increasing order of distances of the wireless terminals from the base station; and

transmitting data in the time interval for the forward link and receiving data in the time interval for the reverse link.

2. The method according to claim 1, further comprising the step of:

determining whether a wireless terminal is located in the local area or in the remote area of the base station, based on at least one of a distance between the wireless terminal and the base station, a traveling speed of the wireless terminal, and a received signal power level of the base station and the wireless terminal.

3. The method according to claim 1, wherein a MIMO method and an AMC method are used for communication with terminals located in the local area of the base station.

4. The method according to claim 1, wherein frequency hopping and spreading methods are used for communication with terminals located in the remote area of the base station.

5. The method according to claim 1, wherein the switching time is set to a minimum time interval capable of preventing data overlap between data in the forward link and data in the reverse link.

6. A method for transmitting and receiving data by a base station for communication with a wireless terminal using an OFDMA scheme, the method comprising the steps of:

determining an orthogonal frequency band for a forward link and an orthogonal frequency band for a reverse link in an available orthogonal frequency band;

allocating the determined orthogonal frequency bands for the forward link and the reverse link to wireless terminals located in local and remote areas of the base station in a decreasing order of distances of the wireless terminals from the base station; and

transmitting and receiving data through the allocated orthogonal frequency bands in the forward and reverse links, respectively.

7. The method according to claim 6, further comprising the step of determining whether the wireless terminal is located in the local area or in the remote area of the base station, based on at least one of a distance between the wireless terminal and the base station, a traveling speed of the wireless terminal, and a received signal power level of the base station and the wireless terminal.

8. The method according to claim 6, wherein a MIMO method and an AMC method are used for communication with terminals located in the local area.

9. The method according to claim 6, wherein frequency hopping and spreading methods are used for communication with terminals located in the remote area.