MOBILE STATION, BASE STATION AND COMMUNICATIONS METHOD

• US 20090303937A1
• Filed: 06/13/2006
• Published: 12/10/2009
• Est. Priority Date: 06/14/2005
• Status: Active Grant

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Sawahashi, Mamoru, Higuchi, Kenichi
• Granted Patent: US 8,897,231 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/1867 Arrangements specially adapted for the transmitter end
• CPC Class Codes: H04L 5/0016 Time-frequency-code
• CPC Class Codes: H04L 5/0037 Inter-user or inter-terminal allocation
• CPC Class Codes: H04L 5/0046 Determination of how many bits are transmitted on different sub-channels
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority
• CPC Class Codes: H04W 28/04 Error control
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/325 Power control of control or pilot channels
• CPC Class Codes: H04W 72/12 Wireless traffic scheduling
• CPC Class Codes: H04W 74/02 Hybrid access

Abstract

A disclosed mobile station includes a multiplexing portion that multiplexes a contention-based channel and a non-contention-base channel, and a transmitting portion that transmits the multiplexed contention-based and non-contention-based channels to a base station. In the mobile station, the contention-based channel and the non-contention-based channel are distinguished from whether scheduling is performed before transmission in the base station. The contention-based channel includes one or more of a fast access channel, a reservation channel, and a synchronization channel. The non-contention-based channel includes one or more of an uplink shared data channel and an uplink shared control channel. The fast access channel includes traffic data, or control data having a data size smaller than a predetermined size, or a combination thereof. The reservation channel includes information to request scheduling the non-contention-based channel. The uplink data channel includes the traffic data, or the control data, or a combination thereof.

Claims

1. A mobile station comprising:

a multiplexing portion that multiplexes a contention-based channel and a non-contention-based channel; and

a transmitting portion that transmits the multiplexed contention-based and non-contention-based channels to a base station;

wherein scheduling before transmission in the base station is performed not on the contention-based channel but on the non-contention-based channel, the contention-based channel including one or more of a fast access channel, a reservation channel, and a synchronization channel, the non-contention-based channel including one or more of an uplink shared data channel and an uplink shared control channel,

wherein the fast access channel includes traffic data, or control data having a data size smaller than a predetermined size, or a combination thereof,

wherein the reservation channel includes information to request scheduling the non-contention-based channel, and

wherein the uplink data channel includes the traffic data, or the control data, or a combination thereof.

2. The mobile station of claim 1, wherein plural of the contention-based channels are multiplexed between plural users by a frequency multiplexing method, or a code multiplexing method, or a combination thereof.

3. The mobile station of claim 1, wherein an uplink frequency band is divided into plural frequency blocks;

wherein each of the plural frequency blocks includes one or more carriers; and

wherein the contention-based channel and the non-contention-based channel are transmitted using one or more frequency blocks.

4. The mobile station of claim 1, wherein the synchronization channel is transmitted less frequently than the fast access channel.

5. The mobile station of claim 1, wherein the uplink shared control channel includes one or more control information items associated with the uplink shared data channel on which the scheduling has been performed, control information associated with the downlink shared data channel on which the scheduling has been performed, control information to be used to change scheduling contents of the uplink shared data channel, and control information to be used to perform scheduling the downlink shared data channel.

6. The mobile station of claim 5, wherein the uplink shared control channel includes necessary control information that has to be transmitted associated with the uplink shared data channel, the necessary control information including information indicating a combination of a modulating method and a coding method.

7. The mobile station of claim 6, wherein the necessary control information further includes retransmission information which includes information indicating whether a packet to be retransmitted through the uplink shared data channel is a retransmission packet and information on redundancy version of a channel coding suitable to the retransmission packet.

8. The mobile station of claim 1, where the uplink shared data channel is transmitted in accordance with a scheduling content determined based on a channel condition.

9. The mobile station of claim 1, wherein a signal obtained by time-multiplexing the uplink shared control channel, the uplink shared data channel and the pilot channel is transmitted at unit transmission time intervals.

10. The mobile station of claim 1, wherein plural of the uplink shared control channels are multiplexed between plural users by a frequency multiplexing method, or a code multiplexing method, or a combination thereof.

11. The mobile station of claim 10, wherein the plural uplink shared control channels corresponding to the plural users are multiplexed by the frequency multiplexing method when the number of the users is less than a predetermined number, and multiplexed by the frequency multiplexing and code multiplexing methods when the number of the users exceeds the predetermined number.

12. The mobile station of claim 10, wherein the plural uplink shared control channels corresponding to the plural users have plural frequency components arranged at predetermined frequency intervals.

13. The mobile station of claim 10, wherein the uplink shared control channels include either one of necessary control information to be transmitted associated with the uplink shared data channel and control information except for the necessary control information, or a combination thereof;

and

wherein either one of the necessary control information and the control information except for the necessary control information, or a combination thereof, is transmitted in the same frequency band in the same time slot as the control information except for the necessary control information of another mobile station.

14. The mobile station of claim 10, wherein the uplink shared control channels include either one of necessary control information to be transmitted associated with the uplink shared data channel and control information except for the necessary control information, or a combination thereof;

and

wherein the either one of the necessary control information and the control information except for the necessary control information, or a combination thereof is transmitted by a radio resource different in either one of the frequency band and the time slot, or a combination thereof, from the radio resource to be used to transmit the control information except for the necessary control information of another mobile station.

15. The mobile station of claim 10, wherein the uplink shared control channels include either one of necessary control information to be transmitted associated with the uplink shared data channel and control information except for the necessary control information, or a combination thereof;

and

wherein the control information except for the necessary control information is transmitted in a frequency band prepared differently from the frequency band for the necessary control information.

16. The mobile station of claim 10, wherein the uplink shared control channels include either one of necessary control information to be transmitted associated with the uplink shared data channel and control information except for the necessary control information, or a combination thereof;

and

wherein the control information except for the necessary control information is transmitted in a frequency band narrower than the frequency band for the shared data channel.

17. The mobile station of claim 1, wherein a frequency band allocated to a system includes plural system frequency blocks;

and

wherein an uplink channel is transmitted using a frequency band occupied by one or more resource blocks included in the system frequency blocks.

18. The mobile station of claim 17, wherein allocating the system frequency blocks is changed adaptively or regularly by the base station.

19. The mobile station of claim 17, wherein the uplink shared control channel includes control information except for necessary control information to be transmitted associated with the uplink data channel;

and

wherein the resource blocks to be used to transmit the shared control channel are changed in accordance with a predetermined frequency hopping pattern.

20. The mobile station of claim 19, wherein when the uplink shared data channel is allocated even when the resource blocks to be used are changed in accordance with the frequency hopping pattern, the necessary control information and the control information except for the necessary control information are transmitted by a resource block to which the uplink data channel is allocated.

21. The mobile station of claim 17, wherein the uplink shared control channel includes control information except for necessary control information that has to be transmitted associated with the uplink shared data channel;

and

wherein the resource blocks to be used to transmit the uplink shared control channel are shared by the plural users.

22. The mobile station of claim 9, further comprising:

a Fourier transformation portion that inputs the multiplexed signal;

a mapping portion that relates the Fourier-transformed signal to a predetermined frequency component; and

an inverse Fourier transformation portion that performs an inverse Fourier transformation on an output signal from the mapping portion;

wherein the signal input to the multiplexing portion is mapped in a frequency domain.

23. The mobile station of claim 1, wherein a combination of a modulating method and a coding method to be used for the uplink shared control channel is controlled based on at least one of a transmission control bit and a channel condition.

24. The mobile station of claim 23, further comprising a memory portion that stores a corresponding relationship between transmission power and the combination of the modulating method and the coding method, the corresponding relationship being to be used for the uplink shared control channel.

25. The mobile station of claim 1, wherein transmission power of the uplink shared control channel is determined in the mobile station by an open-loop transmission power control method.

26. The mobile station of claim 1, further comprising a memory portion that stores information indicating a corresponding relationship among channel quality information obtained in the base station, transmission power of the uplink shared control channel, and a combination of a modulating method and a coding method of the uplink shared data channel.

27. The mobile station of claim 1, wherein different transmission power control methods for the uplink shared control channel are employed in accordance with absence/presence of the uplink shared data channel and control information of the uplink shared control channel.

28. The mobile station of claim 1, further comprising a memory portion that stores information indicating a corresponding relationship among channel quality information obtained in the base station, a combination of a modulating method and a coding method for the uplink shared data channel, and transmission power and period of the uplink shared control channel.

29. The mobile station of claim 1, further comprising plural antennas which are adapted to enable Multi Input Multi Output-based communications.

30. The mobile station of claim 29, wherein when the shared data channel is allocated, the shared control channel is transmitted by any one of a single antenna transmission method, a transmission diversity method, and a Multi Input Multi Output multiplexing method.

31. The mobile station of claim 29, wherein when the shared data channel is not allocated, the shared control channel is transmitted by either one of a single antenna transmission method and a transmission diversity method.

32. The mobile station of claim 29, wherein a feedback signal in response to a signal from one transmission antenna of the base station and another feedback signal in response to another transmission antenna of the same base station are transmitted in the same unit transmission time interval.

33. The mobile station of claim 29, wherein a feedback signal in response to a signal from one transmission antenna of the base station and another feedback signal in response to another transmission antenna of the same base station are transmitted in different unit transmission time intervals.

34. A base station comprising:

a receiving portion that receives a signal obtained by multiplexing a contention-based channel and a non-contention-based channel; and

a demultiplexing portion that demultiplexes the contention-based channel and the non-contention-based channel from the received signal;

wherein scheduling before transmission in the base station is performed not on the contention-based channel but on the non-contention-based channel, the contention-based channel including one or more of a fast access channel, a reservation channel, and a synchronization channel, the non-contention-based channel including one or more of an uplink shared data channel and an uplink shared control channel,

wherein the fast access channel includes traffic data, or control data having a data size smaller than a predetermined size, or a combination thereof,

wherein the reservation channel includes information to request scheduling the non-contention-based channel, and

wherein the uplink data channel includes the traffic data, or the control data, or a combination thereof.

35. The base station of claim 34, wherein an instruction signal is transmitted to each of plural mobile stations so that plural of the uplink shared control channels are multiplexed between plural users by a frequency multiplexing method, or a code multiplexing method, or a combination thereof.

36. The base station of claim 35, wherein an instruction signal is transmitted to each of the plural mobile stations so that the plural uplink shared control channels corresponding to the plural users are multiplexed by the frequency multiplexing method when the number of the users is less than or equal to a predetermined number, and multiplexed by the frequency multiplexing and the code multiplexing methods when the number of the users is more than the predetermined number.

37. The base station of claim 35, wherein an instruction signal is transmitted to each of the plural mobile stations so that the uplink shared control channels corresponding to the plural users have plural frequency components arranged at predetermined frequency intervals.

38. The base station of claim 34, wherein the uplink shared control channel includes either one of necessary control information that has to be transmitted associated with the uplink shared data channel, control information except for the necessary control information, or a combination thereof and

wherein an instruction signal is transmitted to each of the plural mobile stations so that the necessary control information from one mobile station and the control information from another mobile station except for the necessary information are received in the same frequency band in the same time slot.

39. The base station of claim 34, wherein the uplink shared control channel includes either one of necessary control information that has to be transmitted associated with the uplink shared data channel, control information except for the necessary control information, or a combination thereof;

and

wherein an instruction signal is transmitted to each of the plural mobile stations so that radio resources of the necessary control information from one mobile station and the control information from another mobile station except for the necessary information are different in either one of frequency band and time slot, or combination thereof.

40. The base station of claim 34, wherein the uplink shared control channel includes either one of necessary control information that has to be transmitted associated with the uplink shared data channel, control information except for the necessary control information, or a combination thereof;

and

wherein a frequency band to be used to transmit the control information except for the necessary control information is prepared differently from the frequency band for the necessary control information.

41. The base station of claim 34, wherein the uplink shared control channel includes either one of necessary control information that has to be transmitted associated with the uplink shared data channel, control information except for the necessary control information, or a combination thereof;

and

wherein the control information except for the necessary control information is transmitted in a frequency band narrower than the frequency band for the shared data channel.

42. The base station of claim 34, wherein a frequency band given to a system includes plural system frequency blocks;

and

wherein the uplink channel from a mobile station is received using a frequency band occupying one or more resource blocks included in the system frequency blocks.

43. The base station of claim 42, wherein the system frequency blocks are determined based on a maximum transmission bandwidth of a lowest grade mobile station.

44. The base station of claim 42, wherein the uplink shared data channel includes control information except for necessary control information that has to be transmitted associated with the uplink shared data channel;

and

wherein a predetermined frequency hopping pattern is provided to the mobile station so that the resource blocks to be used for transmission of the uplink shared control channel are changed.

45. The base station of claim 44, wherein the mobile station to which the uplink shared data channel is allocated transmits the necessary control information and the control information except for the necessary control information using the resource blocks to which the uplink shared data channel is allocated, even when the resource blocks to be used are changed in accordance with the frequency hopping pattern.

46. The base station of claim 42, wherein the uplink shared control channel includes control information except for necessary control information that has to be transmitted associated with the uplink shared data channel;

and

wherein an instruction signal is transmitted to each of the plural mobile stations so that the resource blocks to be used for transmission of the uplink shared control channel are shared by plural users.

47. The base station of claim 34, wherein a combination of a modulating method and a coding method to be used for the uplink shared control channel is controlled depending on at least one of a channel condition and an amount of information to be transmitted.

48. The base station of claim 47, further comprising a memory portion that stores a corresponding relationship among channel quality information obtained in the base station, the combination of the modulating method and the coding method of the shared control channel, and transmission power of the uplink shared control channel.

49. The base station of claim 47, further comprising a memory portion that stores information indicating a corresponding relationship among channel quality information obtained in the base station, the combination of the modulating method and the coding method of the uplink shared data channel, the transmission power and period of the uplink shared control channel.

50. The base station of claim 47, wherein transmission from a mobile station is controlled in such a manner that the number of symbols is changeable in accordance with the number of necessary bits for control information and a channel condition when the uplink shared control channel is transmitted along with the uplink shared data channel

51. A method comprising the steps of:

multiplexing a contention-based channel and a non-contention-based channel; and

transmitting the multiplexed contention-based and non-contention-based channels;

wherein scheduling before transmission in the base station is performed not on the contention-based channel but on the non-contention-based channel, the contention-based channel including one or more of a fast access channel, a reservation channel, and a synchronization channel, the non-contention-based channel including one or more of an uplink shared data channel and an uplink shared control channel,

wherein the fast access channel includes traffic data, or control data having a data size smaller than a predetermined size, or a combination thereof,

wherein the reservation channel includes information to request scheduling the non-contention-based channel, and

wherein the uplink data channel includes the traffic data, or the control data, or a combination thereof.