COMMUNICATION SYSTEM, BASE STATION APPARATUS, AND MOBILE STATION APPARATUS

• US 20110034177A1
• Filed: 03/30/2009
• Published: 02/10/2011
• Est. Priority Date: 03/31/2008
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Machino, Katsuyuki, Oh, Wahoh
• Granted Patent: US 8,670,438 B2
• Time in Patent Office: Days
• US Class Current: 455/450
• CPC Class Codes: H04J 11/0086 Search parameters, e.g. search strategy, accumulation length, range of search, thresholds code acquisition in DSSS H04B1/7075
• CPC Class Codes: H04W 16/32 Hierarchical cell structures
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/54 based on quality criteria

Abstract

Utilizing a frequency-bandwidth limited IMT frequency band of 3 GHz, requirements of IMT-Advanced; that is, 100 Mbps for high speed movement and 1 Gbps for low speed movement in the downlink are satisfied. A communication system performs radio communication between a base station apparatus 40a and a mobile station apparatus 50 using a plurality of frequency layers having frequency bands different from each other, wherein the base station apparatus 40a assigns a downlink cell common control channel and a downlink cell common traffic channel to a low-frequency layer, and assigns a downlink cell dedicated control channel and a downlink cell dedicated traffic channel to a low-frequency layer and/or a high-frequency layer according to a downlink channel status and a communication requirement of the mobile station apparatus 50.

Claims

1. A communication system which performs radio communication between a base station apparatus and a mobile station apparatus using a plurality of frequency layers having frequency bands different from each other, wherein

said base station apparatus assigns a downlink cell common control channel and a downlink cell common traffic channel to a low-frequency layer, and assigns a downlink cell dedicated control channel and a downlink cell dedicated traffic channel to a low-frequency layer and/or a high-frequency layer according to a downlink channel status and a communication requirement from said mobile station apparatus.

2. The communication system according to claim 1, wherein said base station apparatus receives a numerical value indicating the channel status of said mobile station apparatus, compares said numerical value indicating the channel status with a predetermined threshold value, and, if said numerical value indicating the channel status is smaller than said threshold value, assigns a downlink cell dedicated control channel and a downlink cell dedicated traffic channel to a low-frequency layer.

3. The communication system according to claim 1, wherein said base station apparatus receives a numerical value indicating the channel status of said mobile station apparatus, compares the numerical value indicating said channel status with a predetermined threshold value, and, if said numerical value indicating the channel status is larger than said threshold value, determines said communication requirement of said mobile station apparatus, and assigns a downlink cell dedicated control channel and a downlink cell dedicated traffic channel to a high-frequency layer if said communication requirement of said mobile station apparatus is a second communication requirement, and assigns a downlink cell dedicated control channel and a downlink cell dedicated traffic channel to a low-frequency layer and a high-frequency layer if said communication requirement of said mobile station apparatus is a third communication requirement or a fourth communication requirement.

4. The communication system according to claim 1, wherein said base station apparatus determines said communication requirement of said mobile station apparatus, and assigns a downlink cell dedicated control channel and a downlink cell dedicated traffic channel to a low-frequency layer if said communication requirement of said mobile station apparatus is a first communication requirement, assigns a downlink cell dedicated control channel and a downlink cell dedicated traffic channel to a high-frequency layer if said communication requirement of said mobile station apparatus is a second communication requirement, and assigns a downlink cell dedicated control channel and a downlink cell dedicated traffic channel to a low-frequency layer and a high-frequency layer if said communication requirement of said mobile station apparatus is a third communication requirement or a fourth communication requirement.

5. A base station apparatus which performs radio communication with a mobile station apparatus using a plurality of frequency layers having frequency bands different from each other, said base station apparatus comprising:

a determination unit which determines a downlink channel status of said mobile station apparatus and a communication requirement of said mobile station apparatus; and

a mapping unit which assigns a downlink cell common control channel and a downlink cell common traffic channel to a low-frequency layer and assigns a downlink cell dedicated control channel and a downlink cell dedicated traffic channel to a low-frequency layer and/or a high-frequency layer based on a downlink channel status of a mobile station apparatus and a communication requirement of said mobile station apparatus as a result of said determination.

6. The base station apparatus according to claim 5, wherein

said determination unit compares a numerical value indicating a channel status of said mobile station apparatus with a predetermined threshold value, and

said mapping unit assigns a downlink cell dedicated control channel and a downlink cell dedicated traffic channel to a low-frequency layer, if, as a result of said comparison, said numerical value indicating the channel status is smaller than said threshold value.

7. The base station apparatus according to claim 5, wherein

said determination unit compares a numerical value indicating a channel status of said mobile station apparatus with a predetermined threshold value and if, as a result of said comparison, said numerical value indicating the channel status is larger than said threshold value, determines said communication requirement of said mobile station apparatus;

and

said mapping unit assigns a downlink cell dedicated control channel and a downlink cell dedicated traffic channel to a high-frequency layer, if, as a result of said determination, said communication requirement of said mobile station apparatus is a second communication requirement, and assigns a downlink cell dedicated control channel and a downlink cell dedicated traffic channel to a low-frequency layer and a high-frequency layer if said communication requirement of said mobile station apparatus is a third communication requirement or a fourth communication requirement.

8. The base station apparatus according to claim 5, wherein

said determination unit determines said communication requirement of said mobile station apparatus, and

said mapping unit assigns a downlink cell dedicated control channel and a downlink cell dedicated traffic channel to a low-frequency layer if, as a result of said determination, said communication requirement of said mobile station apparatus is a first communication requirement, assigns a downlink cell dedicated control channel and a downlink cell dedicated traffic channel to a high-frequency layer if said communication requirement of said mobile station apparatus is a second communication requirement, and assigns a downlink cell dedicated control channel and a downlink cell dedicated traffic channel to a low-frequency layer and a high-frequency layer if said communication requirement of said mobile station apparatus is a third communication requirement or a fourth communication requirement.

9. A mobile station apparatus which performs radio communication with a base station apparatus using a plurality of frequency layers having frequency bands different from each other, wherein said mobile station apparatus

receives from said base station apparatus a downlink cell common control channel and a downlink cell common traffic channel assigned to a low-frequency layer, and

receives from said base station apparatus a downlink cell dedicated control channel and a downlink cell dedicated traffic channel assigned to a low-frequency layer and/or a high-frequency layer according to a downlink channel status and a communication requirement.