Base station and broadcast channel transmission method

• US 8,265,031 B2
• Filed: 06/16/2008
• Issued: 09/11/2012
• Est. Priority Date: 06/19/2007
• Status: Expired due to Fees

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Tanno, Motohiro, Kishiyama, Yoshihisa, Higuchi, Kenichi, Sawahashi, Mamoru
• Primary Examiner(s): Ferris, Derrick
• Assistant Examiner(s): YEUNG, MANG HANG
• Application Number:
  US12/663,994
• Publication Number:
  US 20100177697A1
• Time in Patent Office: 1,548 Days
• Field of Search: 370328-330, 370/478, 455/422.1, 455/450, 455/464, 455/509, 455524-525
• US Class Current: 370/330
• CPC Class Codes: H04L 1/0046 Code rate detection or code type detection H04L1/0038 takes precedence; detection of the data rate H04L25/0262; for packet format H04L1/0091
• CPC Class Codes: H04L 1/0061 Error detection codes
• CPC Class Codes: H04L 1/0067 Rate matching H04L1/0013 and H04L1/08 take precedence
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• 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: H04W 48/12 using downlink control channel

Abstract

A disclosed base station transmits a broadcast channel to a user device a predefined number of times in a predetermined cycle for communication with the user device. The base station includes a repetition unit configured to repeat the broadcast channel, after the broadcast channel is channel-coded, for the predefined number of times to generate multiple broadcast channels; and a signal waveform changing unit configured to process the generated broadcast channels such that the processed broadcast channels have different signal waveforms. Positions of the broadcast channels in the order of transmission in the predetermined cycle are associated with the signal waveforms of the broadcast channels.

Claims

1. A base station transmitting a broadcast channel to a user device a predefined number of times in a predetermined cycle for communication with the user device, the base station comprising:

a repetition unit configured to repeat the broadcast channel, after the broadcast channel is channel-coded, for the predefined number of times to generate multiple broadcast channels;

a signal waveform changing unit configured to process the generated broadcast channels such that the processed broadcast channels have different signal waveforms,

wherein positions of the broadcast channels in order of transmission in the predetermined cycle are associated with the signal waveforms of the broadcast channels;

an interleaving unit configured to interleave information bits of the respective broadcast channels generated by the repetition unit;

a data modulation unit configured to data-modulate the interleaved broadcast channels; and

a spreading unit configured to multiply the data-modulated broadcast channels by scrambling codes,

wherein the signal waveform changing unit is configured to control the spreading unit to multiply the respective data-modulated broadcast channels by different scrambling codes.

2. The base station as claimed in claim 1, wherein the signal waveform changing unit is configured to puncture the broadcast channels generated by the repetition unit using different puncturing patterns.

3. The base station as claimed in claim 1, further comprising:

an interleaving unit configured to interleave information bits of the respective broadcast channels generated by the repetition unit,

wherein the signal waveform changing unit is configured to control the interleaving unit to interleave the information bits of the respective broadcast channels based on different interleaving patterns.

4. The base station as claimed in claim 1, further comprising:

an interleaving unit configured to interleave information bits of the respective broadcast channels generated by the repetition unit;

a data modulation unit configured to data-modulate the interleaved broadcast channels;

a spreading unit configured to multiply the data-modulated broadcast channels by scrambling codes; and

a mapping unit configured to map the multiplied broadcast channels in a center frequency band in a system frequency band,

wherein the signal waveform changing unit is configured to control the mapping unit to map the respective multiplied broadcast channels to different radio resources.

5. The base station as claimed in claim 4, wherein the mapping unit is configured to map the broadcast channels across the same center frequency band as that where a synchronization channel is mapped.

6. The base station as claimed in claim 5, further comprising:

a scheduler configured to select, for each subframe, one or more mobile stations allowed to communicate using a shared channel and to determine resource blocks used for user data to be received by the selected mobile stations,

wherein the mapping unit is configured to map a broadcast channel including information on the determined resource blocks and to be transmitted via a physical downlink shared channel to one or more resource blocks in the same center frequency band as that where the synchronization channel is mapped.

7. The base station as claimed in claim 6, wherein a bandwidth of the resource blocks in the center frequency band is the same as a bandwidth of resource blocks in frequency bands other than the center frequency band.

8. The base station as claimed in claim 7, wherein a size of the resource blocks in the center frequency band is the same as a size of the resource blocks in the frequency bands other than the center frequency band.

9. The base station as claimed in claim 4, wherein the mapping unit is configured to map the broadcast channels in a part of the same center frequency band as that where a synchronization channel is mapped.

10. A method of transmitting a broadcast channel by a base station to a user device for communication with the user device where the broadcast channel is transmitted a predefined number of times in a predetermined cycle, the method comprising:

a repetition step of repeating the broadcast channel, after the broadcast channel is channel-coded, for the predefined number of times to generate multiple broadcast channels;

a signal waveform changing step of processing the generated broadcast channels such that the processed broadcast channels have different signal waveforms that are associated with positions of the broadcast channels in order of transmission in the predetermined cycle;

an interleaving step of interleaving information bits of the respective broadcast channels generated by the repetition step;

a data modulation step of data-modulating the interleaved broadcast channels; and

a spreading step of multiplying the data-modulated broadcast channels by scrambling codes,

wherein the signal waveform changing step controls the spreading step to multiply the respective data-modulated broadcast channels by different scrambling codes.