Control system and multiple access method in wireless communication system
First Claim
1. A wireless communication system for providing a service in time and frequency division duplexing modes, the system comprising:
- a wireless terminal for transmitting a duplexing mode determination factor when a call is established, receiving a command for at least one of a time division duplexing mode and a frequency division duplexing mode for reverse transmission, determining an access method and a hopping mode according to each of the time and frequency division duplexing modes, and establishing a forward channel and a reverse channel according to the set time or frequency division duplexing mode for reverse transmission to perform communication; and
a base station for receiving the duplexing mode determination factor from the wireless terminal when the call is established, setting the at least one of the time division duplexing mode and the frequency division duplexing mode for the reverse transmission, setting a time division duplexing mode for forward transmission according to the received duplexing mode determination factor, determining a frequency hopping mode and a multiple access mode, and communicating with the wireless terminal according to the determined frequency hopping mode and the determined multiple access mode.
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Accused Products
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.
196 Citations
37 Claims
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1. A wireless communication system for providing a service in time and frequency division duplexing modes, the system comprising:
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a wireless terminal for transmitting a duplexing mode determination factor when a call is established, receiving a command for at least one of a time division duplexing mode and a frequency division duplexing mode for reverse transmission, determining an access method and a hopping mode according to each of the time and frequency division duplexing modes, and establishing a forward channel and a reverse channel according to the set time or frequency division duplexing mode for reverse transmission to perform communication; and
a base station for receiving the duplexing mode determination factor from the wireless terminal when the call is established, setting the at least one of the time division duplexing mode and the frequency division duplexing mode for the reverse transmission, setting a time division duplexing mode for forward transmission according to the received duplexing mode determination factor, determining a frequency hopping mode and a multiple access mode, and communicating with the wireless terminal according to the determined frequency hopping mode and the determined multiple access mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A call control method in a base station of a wireless communication system for communicating with a wireless terminal in time and frequency division duplexing modes, the method comprising the steps of:
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checking a duplexing mode determination factor received from the wireless terminal when a call is allocated to the wireless terminal;
determining whether the wireless terminal is located in one of a local area and a remote area of the base station, based on the duplexing mode determination factor;
if the wireless terminal is in the local area, allocating a time division duplexing channel to forward and reverse links of the wireless terminal;
if the wireless terminal is in the remote area, allocating a time division duplexing channel to a forward link of the wireless terminal;
determining a frequency hopping mode and a multiple access mode for the allocated channel; and
allocating a frequency division duplexing channel to a reverse link of the wireless terminal to communicate with the wireless terminal. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 31, 32, 33)
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29. 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:
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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. - View Dependent Claims (30)
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34. 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:
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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. - View Dependent Claims (35, 36, 37)
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Specification