US2015029989A1PendingUtilityA1

Wireless communication system, wireless base station, wireless terminal, and wireless communication method

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Assignee: FUJITSU LTDPriority: Mar 19, 2012Filed: Sep 16, 2014Published: Jan 29, 2015
Est. expiryMar 19, 2032(~5.6 yrs left)· nominal 20-yr term from priority
Inventors:Kotaro ShiizakiAkira Ito
H04W 72/21H04W 72/23H04W 72/20H04L 1/1861H04L 5/0055H04W 72/1268H04L 5/0073H04L 5/0035H04L 5/0094H04L 5/0053H04W 72/232H04W 72/0406
56
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Claims

Abstract

A wireless communication system including: a wireless base station, and a wireless terminal configured to receive a downlink frame including data and a downlink control signal, the downlink control signal being mapped to a first downlink control resource element, and transmit an uplink frame including an uplink control signal, the uplink control signal being mapped to a first uplink control resource element, the first uplink control resource element being determined by shifting a second uplink control resource element of uplink control resource elements by an offset number whose unit is one of the uplink control resource elements, the second uplink control resource element being determined based on a location of the first downlink control resource element in the downlink frame, the offset number being determined based on a first offset information included in the downlink control signal.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A wireless communication system comprising:
 a wireless base station; and   a wireless terminal configured   to receive from the wireless base station a downlink frame including data and a downlink control signal for decoding the data, the downlink control signal being mapped to a first downlink control resource element of downlink control resource elements that are resource units used for transmissions of downlink control signals in the downlink frame, and   to transmit an uplink frame including an uplink control signal for acknowledging a decoding result of the data, the uplink control signal being mapped to a first uplink control resource element of uplink control resource elements that are resource units used for transmissions of uplink control signals in the uplink frame, the first uplink control resource element being determined by shifting a second uplink control resource element of the uplink control resource elements by an offset number whose unit is one of the uplink control resource elements, the second uplink control resource element being determined based on a location of the first downlink control resource element in the downlink frame, the offset number being determined based on a first offset information included in the downlink control signal.   
     
     
         2 . The wireless communication system according to  claim 1 , wherein
 the downlink control resource elements and the uplink control resource elements are Control Channel Elements (CCEs) of Long Term Evolution (LTE).   
     
     
         3 . The wireless communication system according to  claim 1 , wherein
 the downlink control signal is Downlink Control Information (DCI) of Long Term Evolution (LTE).   
     
     
         4 . The wireless communication system according to  claim 1 , wherein
 the downlink frame and the uplink frame are subframes of Long Term Evolution (LTE).   
     
     
         5 . The wireless communication system according to  claim 1 , wherein
 the offset number is determined further based on a second offset information included in a specified signal that is received by the wireless terminal.   
     
     
         6 . The wireless communication system according to  claim 1 , wherein
 the first offset information is determined by the base station based on an interference between the uplink control signal and another uplink control signal.   
     
     
         7 . The wireless communication system according to  claim 1 , wherein the uplink frame is transmitted by the wireless terminal to the wireless base station and the wireless base station transmits the downlink frame to the wireless terminal. 
     
     
         8 . A wireless base station comprising:
 a memory; and   a processor coupled to the memory and configured   to transmit to a wireless terminal a downlink frame including data and a downlink control signal for decoding the data, the downlink control signal being mapped to a first downlink control resource element of downlink control resource elements that are resource units used for transmissions of downlink control signals in the downlink frame, and   to receive from the wireless terminal an uplink frame including an uplink control signal for acknowledging a decoding result of the data, the uplink control signal being mapped to a first uplink control resource element of uplink control resource elements that are resource units used for transmissions of uplink control signals in the uplink frame, the first uplink control resource element being determined by shifting a second uplink control resource element of the uplink control resource elements by an offset number whose unit is one of the uplink control resource elements, the second uplink control resource element being determined based on a location of the first downlink control resource element in the downlink frame, the offset number being determined based on a first offset information included in the downlink control signal.   
     
     
         9 . The wireless base station according to  claim 8 , wherein
 the downlink control resource elements and the uplink control resource elements are Control Channel Elements (CCEs) of Long Term Evolution (LTE).   
     
     
         10 . The wireless base station according to  claim 8 , wherein
 the downlink control signal is Downlink Control Information (DCI) of Long Term Evolution (LTE).   
     
     
         11 . The wireless base station according to  claim 8 , wherein
 the downlink frame and the uplink frame are subframes of Long Term Evolution (LTE).   
     
     
         12 . The wireless base station according to  claim 8 , wherein
 the offset number is determined further based on a second offset information included in a specified signal that is received by the wireless terminal.   
     
     
         13 . The wireless base station according to  claim 8 , wherein
 the first offset information is determined by the base station based on an interference between the uplink control signal and another uplink control signal.   
     
     
         14 . The wireless base station according to  claim 8 , wherein the uplink frame is transmitted by the wireless terminal to the wireless base station. 
     
     
         15 . A wireless terminal comprising:
 a memory; and   a processor coupled to the memory and configured   to receive from a wireless base station a downlink frame including data and a downlink control signal for decoding the data, the downlink control signal being mapped to a first downlink control resource element of downlink control resource elements that are resource units used for transmissions of downlink control signals in the downlink frame, and   to transmit an uplink frame including an uplink control signal for acknowledging a decoding result of the data, the uplink control signal being mapped to a first uplink control resource element of uplink control resource elements that are resource units used for transmissions of uplink control signals in the uplink frame, the first uplink control resource element being determined by shifting a second uplink control resource element of the uplink control resource elements by an offset number whose unit is one of the uplink control resource elements, the second uplink control resource element being determined based on a location of the first downlink control resource element in the downlink frame, the offset number being determined based on a first offset information included in the downlink control signal.   
     
     
         16 . The wireless terminal according to  claim 15 , wherein
 the downlink control resource elements and the uplink control resource elements are Control Channel Elements (CCEs) of Long Term Evolution (LTE).   
     
     
         17 . The wireless terminal according to  claim 15 , wherein
 the downlink control signal is Downlink Control Information (DCI) of Long Term Evolution (LTE).   
     
     
         18 . The wireless terminal according to  claim 15 , wherein
 the downlink frame and the uplink frame are subframes of Long Term Evolution (LTE).   
     
     
         19 . The wireless terminal according to  claim 15 , wherein
 the offset number is determined further based on a second offset information included in a specified signal that is received by the wireless terminal.   
     
     
         20 . The wireless terminal according to  claim 15 , wherein
 the first offset information is determined by the base station based on an interference between the uplink control signal and another uplink control signal.   
     
     
         21 . The wireless terminal according to  claim 15 , wherein the uplink frame is transmitted by the wireless terminal to the wireless base station and the wireless base station transmits the downlink frame to the wireless terminal. 
     
     
         22 . A wireless communication method comprising:
 receiving from a wireless base station a downlink frame including data and a downlink control signal for decoding the data, the downlink control signal being mapped to a first downlink control resource element of downlink control resource elements that are resource units used for transmissions of downlink control signals in the downlink frame; and   transmitting an uplink frame including an uplink control signal for acknowledging a decoding result of the data, the uplink control signal being mapped to a first uplink control resource element of the uplink control resource elements that are resource units used for transmissions of uplink control signals in the uplink frame, the first uplink control resource element being determined by shifting a second uplink control resource element of uplink control resource elements by an offset number whose unit is one of the uplink control resource elements, the second uplink control resource element being determined based on a location of the first downlink control resource element in the downlink frame, the offset number being determined based on a first offset information included in the downlink control signal.   
     
     
         23 . The wireless communication method according to  claim 22 , wherein
 the downlink control resource elements and the uplink control resource elements are Control Channel Elements (CCEs) of Long Term Evolution (LTE).   
     
     
         24 . The wireless communication method according to  claim 22 , wherein
 the downlink control signal is Downlink Control Information (DCI) of Long Term Evolution (LTE).   
     
     
         25 . The wireless communication method according to  claim 22 , wherein
 the downlink frame and the uplink frame are subframes of Long Term Evolution (LTE).   
     
     
         26 . The wireless communication method according to  claim 22 , wherein
 the offset number is determined further based on a second offset information included in a specified signal that is received by the wireless terminal.   
     
     
         27 . The wireless communication method according to  claim 22 , wherein
 the first offset information is determined by the base station based on an interference between the uplink control signal and another uplink control signal.   
     
     
         28 . The wireless communication method according to  claim 22 , wherein the uplink frame is transmitted by the wireless terminal to the wireless base station and the wireless base station transmits the downlink frame to the wireless terminal.

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