MOBILE COMMUNICATION SYSTEM, BASE STATION APPARATUS, USER EQUIPMENT, AND METHOD
A base station apparatus is used in a mobile communication system in which at least a shared data channel is transmitted by an orthogonal modulation scheme using an I-channel and a Q-channel. The base station apparatus includes a providing unit providing Acknowledgement/Non-Acknowledgement information indicating whether retransmission of a signal received in uplink is required; a mapping unit mapping a number of multiplexed users of the Acknowledgement/Non-Acknowledgement information to the I-channel or the Q-channel based on a predetermined mapping table; and a reporting unit reporting the Acknowledgement/Non-Acknowledgement information to the respective users. The mapping table indicates that, when the number of the multiplexed users is equal to or less than a predetermined number, the Acknowledgement/Non-Acknowledgement information is associated with the I-channel or the Q-channel, and otherwise, the Acknowledgement/Non-Acknowledgement information is associated with the I-channel and the Q-channel.
1 . A base station apparatus used in a mobile communication system in which at least a shared data channel is transmitted by an orthogonal modulation scheme using an I-channel and a Q-channel, the base station apparatus comprising:
a providing unit configured to provide Acknowledgement/Non-Acknowledgement information indicating whether retransmission of a signal received in uplink is required;
a mapping unit configured to map a number of multiplexed users of the Acknowledgement/Non-Acknowledgement information to the I-channel or the Q-channel based on a predetermined mapping table; and
a reporting unit configured to report the Acknowledgement/Non-Acknowledgement information to the respective users, wherein
the mapping table indicates that, when the number of the multiplexed users is equal to or less than a predetermined number, the Acknowledgement/Non-Acknowledgement information is associated with the I-channel or the Q-channel, and when the number of the multiplexed users exceeds the predetermined number, the Acknowledgement/Non-Acknowledgement information is associated with the I-channel and the Q-channel.
2 . The base station apparatus according to claim 1 , further comprising:
a scheduler configured to provide allocation information of uplink resource blocks for each of the users, wherein
a mapping position of the allocation information of each of the users in a downlink control signal is uniquely associated with a mapping position of the Acknowledgement/Non-Acknowledgement information of the corresponding user in the I-channel or the Q-channel.
3 . The base station apparatus according to claim 1 , further comprising:
a scheduler configured to provide allocation information of uplink resource blocks for each of the users, wherein
a resource block allocated to an uplink shared channel of a user is uniquely associated with a mapping position of the Acknowledgement/Non-Acknowledgement information of the user in the I-channel or the Q-channel.
4 . The base station apparatus according to claim 3 , wherein
when the number of the multiplexed users is equal to or less than the predetermined number, a number of resource blocks allocated to the users in uplink is restricted to an even number.
5 . The base station apparatus according to claim 1 , wherein
a group having a number of the Acknowledgement/Non-Acknowledgement information is repeatedly transmitted over different frequencies including a first frequency and a second frequency within a same sub-frame, the number being equal to or less than the predetermined number, in a manner such that mapping orders of at least two of the Acknowledgement/Non-Acknowledgement information mapped to the I-channel are different from each other between the group transmitted over the first frequency and the group transmitted over the second frequency.
6 . The base station apparatus according to claim 1 , wherein
a group having a number of the Acknowledgement/Non-Acknowledgement information is repeatedly transmitted over different frequencies including a first frequency and a second frequency within a same sub-frame, the number being equal to or less than the predetermined number, in a manner such that mapping orders of at least two of the Acknowledgement/Non-Acknowledgement information mapped to the Q-channel are different from each other between the group transmitted over the first frequency and the group transmitted over the second frequency.
7 . The base station apparatus according to claim 1 , wherein
the Acknowledgement/Non-Acknowledgement information of the users is spread using a predetermined spreading factor, and the spread Acknowledgement/Non-Acknowledgement information is code division multiplexed in the same frequency.
8 . A method used in a base station apparatus for a mobile communication system in which at least a shared data channel is transmitted by an orthogonal modulation scheme using an I-channel and a Q-channel, the method comprising:
a providing step of providing Acknowledgement/Non-Acknowledgement information indicating whether retransmission of a signal received in uplink is required;
a mapping step of mapping a number of multiplexed users of the Acknowledgement/Non-Acknowledgement information to the I-channel or the Q-channel based on a predetermined mapping table; and
a reporting step of reporting the Acknowledgement/Non-Acknowledgement information to the respective users, wherein
the mapping table indicates that, when a number of multiplexed users is equal to or less than a predetermined number, the Acknowledgement/Non-Acknowledgement information is associated with the I-channel or the Q-channel, and when the number of the multiplexed users exceeds the predetermined number, the Acknowledgement/Non-Acknowledgement information is associated with the I-channel and the Q-channel.
9 . A user equipment terminal used in a mobile communication system in which at least a shared data channel is transmitted by an orthogonal modulation scheme using an I-channel and a Q-channel, the user equipment terminal comprising:
a demodulation unit configured to demodulate a downlink control signal including allocation information of uplink resource blocks;
a transmission unit configured to transmit an uplink shared channel based on the allocation information; and
an extraction unit configured to extract Acknowledgement/Non-Acknowledgement information from the downlink control signal based on a predetermined mapping table, the Acknowledgement/Non-Acknowledgement information indicating whether retransmission of the shared data channel is required, wherein
the mapping table indicates that, when a number of multiplexed users in the downlink control signal is equal to or less than a predetermined number, the Acknowledgement/Non-Acknowledgement information is associated with the I-channel or the Q-channel, and when the number of the multiplexed users exceeds the predetermined number, the Acknowledgement/Non-Acknowledgement information is associated with the I-channel and the Q-channel.
10 . The user equipment terminal according to claim 9 , wherein
a mapping position of the allocation information of each of the users in a downlink control signal is uniquely associated with a mapping position of the Acknowledgement/Non-Acknowledgement information of the corresponding user in the I-channel or the Q-channel.
11 . The user equipment terminal according to claim 9 , wherein
a resource block allocated to an uplink shared channel of a user is uniquely associated with a mapping position of the Acknowledgement/Non-Acknowledgement information of the user in the I-channel or the Q-channel.
12 . The user equipment terminal according to claim 11 , wherein
when the number of the multiplexed users is equal to or less than the predetermined number, a number of resource blocks allocated to the users in uplink is restricted to an even number.
13 . The user equipment terminal according to claim 9 , wherein
a group having a number of the Acknowledgement/Non-Acknowledgement information is repeatedly transmitted over different frequencies including a first frequency and a second frequency within a same sub-frame, the number being equal to or less than the predetermined number, in a manner such that mapping orders of at least two of the Acknowledgement/Non-Acknowledgement information mapped to the I-channel are different from each other between the group transmitted over the first frequency and the group transmitted over the second frequency.
14 . The user equipment terminal according to claim 9 , wherein
a group having a number of the Acknowledgement/Non-Acknowledgement information is repeatedly transmitted over different frequencies including a first frequency and a second frequency within a same sub-frame, the number being equal to or less than the predetermined number, in a manner such that mapping orders of at least two of the Acknowledgement/Non-Acknowledgement information mapped to the Q-channel is different from each other between the group transmitted over the first frequency and the group transmitted over the second frequency.
15 . The user equipment terminal according to claim 9 , wherein
the Acknowledgement/Non-Acknowledgement information of the users is spread using a predetermined spreading factor, and the spread Acknowledgement/Non-Acknowledgement information is code division multiplexed in the same frequency.
16 . A method used in a user equipment terminal for a mobile communication system in which at least a shared data channel is transmitted by an orthogonal modulation scheme using an I-channel and a Q-channel, the method comprising:
a demodulating step of demodulating a downlink control signal including allocation information of uplink resource blocks;
a transmitting step of transmitting an uplink shared channel based on the allocation information; and
an extracting step of extracting Acknowledgement/Non-Acknowledgement information from the downlink control signal based on a predetermined mapping table, the Acknowledgement/Non-Acknowledgement information indicating whether retransmission of the shared data channel is required, wherein
the mapping table indicates that, when a number of multiplexed users in the downlink control signal is equal to or less than a predetermined number, the Acknowledgement/Non-Acknowledgement information is associated with the I-channel or the Q-channel, and when the number of the multiplexed users exceeds the predetermined number, the Acknowledgement/Non-Acknowledgement information is associated with the I-channel and the Q-channel.
17 . A mobile communication system in which at least a shared data channel is transmitted by an orthogonal modulation scheme using an I-channel and a Q-channel, the mobile communication system including a base station apparatus and a user equipment terminal wirelessly communicating with the base station apparatus,
the base station apparatus comprising:
a providing unit configured to provide Acknowledgement/Non-Acknowledgement information indicating whether retransmission of a signal received in uplink is required;
a mapping unit configured to map a number of multiplexed users of the Acknowledgement/Non-Acknowledgement information to the I-channel or the Q-channel based on a predetermined mapping table; and
a reporting unit configured to report the Acknowledgement/Non-Acknowledgement information to the respective users;
the user equipment terminal comprising:
a demodulation unit configured to demodulate a downlink control signal including allocation information of uplink resource blocks;
a transmission unit configured to transmit an uplink shared channel based on the allocation information; and
an extraction unit configured to extract Acknowledgement/Non-Acknowledgement information from the downlink control signal based on a predetermined mapping table, the Acknowledgement/Non-Acknowledgement information indicating whether retransmission of the shared data channel is required, wherein
the mapping table indicates that, when the number of the multiplexed users is equal to or less than a predetermined number, the Acknowledgement/Non-Acknowledgement information is associated with the I-channel or the Q-channel, and when the number of the multiplexed users exceeds the predetermined number, the Acknowledgement/Non-Acknowledgement information is associated with the I-channel and the Q-channel.