CN104617992B - Wireless communication system, base station apparatus, terminal installation and wireless communications method - Google Patents
Wireless communication system, base station apparatus, terminal installation and wireless communications method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 21
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- 230000005540 biological transmission Effects 0.000 claims abstract description 218
- 238000012545 processing Methods 0.000 claims abstract description 70
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 31
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/022—Site diversity; Macro-diversity
- H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
- H04J11/005—Interference mitigation or co-ordination of intercell interference
- H04J11/0053—Interference mitigation or co-ordination of intercell interference using co-ordinated multipoint transmission/reception
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/27—Control channels or signalling for resource management between access points
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
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Abstract
The present invention provides wireless communication system, base station apparatus, terminal installation and wireless communications method.The wireless communication system carries out wireless communication between the 1st base station apparatus and the 2nd base station apparatus and terminal installation, 1st base station apparatus and the 2nd base station apparatus are in the transmission respectively with progress data between one or more cells or the base station apparatus of sector, wherein, 1st base station apparatus has transport unit, the transmission data for being sent to terminal installation are transmitted to the 2nd base station apparatus by the transport unit, and the 1st base station apparatus and the 2nd base station apparatus possess respectively：Processing unit, according to each cell or sector, when sending the transmission data respectively to terminal installation, which carries out scrambling processing to the transmission data respectively using common scrambler；Sending part, its transmission data after scrambling is handled are separately sent to terminal installation, and terminal installation has receiving division, which receives the transmission data, and carries out scramble process to the transmission data using the common scrambler.
Description
The present application is a divisional application of an invention patent application having an application date of 2009 from 06/15, application No. 200980159884.2, entitled "wireless communication system, base station apparatus, terminal apparatus, and wireless communication method in wireless communication system".
Technical Field
The present invention relates to a wireless communication system, a base station apparatus, a terminal apparatus, and a wireless communication method in the wireless communication system.
Background
In an LTE-a (LTE-Advanced) system, wireless communication based on CoMP (coordinated Multi-point access) has been developed (for example, non-patent documents 1 and 2 below).
For example, when a terminal is located in a region where the terminal can communicate with a plurality of base stations (or sectors), each base station transmits different data to the terminal by using MIMO (Multiple Input Multiple Output), thereby performing CoMP.
On the other hand, in a wireless communication system such as LTE, a base station performs scrambling (scrambling) processing on transmission data (for example, non-patent documents 3 and 4 below). For example, the base station will transmit data b (0),.. or.b (M)bit-1) adding the scrambling code c (i) and calculating the remainder (Modulo) of "2" to perform the scrambling. That is to say that the first and second electrodes,
[ equation 1]
Here, the scrambling code c (i) is a GOLD code having a length of "31", and is obtained by the following generator polynomial.
[ equation 2]
c(n)＝(x1(n+NC)+x2(n+NC))mod2
[ equation 3]
x1(n+31)＝(x1(n+3)+x1(n))mod2
[ equation 4]
x2(n+31)＝(x2(n+3)+x2(n+2)+x2(n+1)+x2(n))mod2
Wherein,
[ equation 5]
x1(0)＝1,x1(n)＝0,n＝1,2,...,30,NC＝1600
Further, the initial value of the scrambling code c (i) is given below.
[ equation 6]
That is, the initial value of the scrambling code c (i) is determined by the following number:
terminal number
[ equation 7]
nRNTI(RNTI:Radio Network Temporary ID)；
(physical) cell (or sector) number;
[ equation 8]
And slot numbering
[ equation 9]
ns。
As such a conventional technique, for example, the following control device is disclosed: the control device is provided with: a transmission allocation unit that selects at least 2 transmission sectors for transmitting to the mobile station based on the reception quality notified from the mobile station, and allocates transmission to the mobile station; and a transmission unit that transmits from the transmission sector to the mobile station using the same scrambling code for sector identification (for example, patent document 1 below).
Further, for example, the following base station apparatus and the like are disclosed: the base station device includes: a base station unique scramble generation unit which generates a base station unique scramble; a sector-specific orthogonal sequence generation unit that generates an orthogonal sequence specific to a sector; and a multiplication control unit that controls whether or not the base station specific scrambling code and the sector specific orthogonal sequence need to be multiplied, depending on whether or not soft combining is required for each physical channel (for example, patent document 2 below).
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2006-311475
Patent document 2: japanese patent laid-open No. 2008-92379
Non-patent document
Non-patent document 1: r1-084203
Non-patent document 2: 3GPP TS 36.210 V8.6.0
Non-patent document 3: 3GPP TS 36.211 V8.2.0
Non-patent document 4: r1-081229
Disclosure of Invention
Problems to be solved by the invention
As described above, the initial value of the scrambling code is determined by the terminal number, the cell number, and the slot number, but the terminal number is set by the base station for each cell, and the cell number is also different for each cell. In addition, the slot number may be different between cells. Therefore, when CoMP transmission is performed for a terminal from different cells, the initial value of the scrambling code is a value different for each cell. Therefore, different scrambling codes are generated in each base station and terminal, and scrambling and descrambling processing is performed using them. Therefore, the processing of each base station and terminal is complicated, and power consumption also increases.
The contents described in patent documents 1 and 2 do not disclose that different data is transmitted from 2 sectors. In the case where different data is transmitted from 2 sectors using the same scrambling code as described in patent document 1, although 2 signals are received by the mobile station, the 2 signals are communicated in a mixed manner, and thus the data transmitted from 2 sectors cannot be identified.
Accordingly, an object of the present invention is to provide a wireless communication system, a base station apparatus, a terminal apparatus, and a wireless communication method in a wireless communication system, in which processing is reduced in the terminal apparatus or the base station apparatus.
Another object of the present invention is to provide a wireless communication system and the like in which power consumption is reduced in a terminal apparatus or a base station apparatus.
According to one aspect, the present invention relates to a wireless communication system for performing wireless communication between a terminal device and 1 st and 2 nd base station devices each having 1 or more cells or sectors, wherein each of the 1 st and 2 nd base station devices includes: a processing unit configured to perform scrambling processing on the 1 st transmission data and the 2 nd transmission data using a common scrambling code when transmitting the 1 st transmission data and the 2 nd transmission data, which are different for each of the cells or the sectors, to the terminal device; and a transmitting unit that transmits the 1 st transmission data and the 2 nd transmission data after the scrambling process to the terminal device, respectively, wherein the terminal device includes a receiving unit that receives the 1 st transmission data and the 2 nd transmission data and descrambles the 1 st transmission data and the 2 nd transmission data using the common scrambling code.
In addition, according to another aspect, the present invention relates to a wireless communication system for performing wireless communication between a terminal device and a 1 st base station device and a 2 nd base station device each having 1 or more cells or sectors, the terminal device including: a processing unit that performs scrambling processing on 1 st transmission data and 2 nd transmission data that are different for each of the cells or the sectors, using a common scrambling code; and a transmitting unit that transmits the 1 st transmission data and the 2 nd transmission data after the scrambling process to the 1 st base station device and the 2 nd base station device, respectively, wherein the 1 st base station device and the 2 nd base station device each have a receiving unit that receives the 1 st transmission data and the 2 nd transmission data and descrambles the 1 st transmission data and the 2 nd transmission data using the common scrambling code.
The present invention can provide a wireless communication system, a base station apparatus, a terminal apparatus, and a wireless communication method in a wireless communication system, in which processing is reduced in the terminal apparatus or the base station apparatus. Further, the present invention can provide a wireless communication system and the like in which power consumption is reduced in a terminal apparatus or a base station apparatus.
Drawings
Fig. 1 is a diagram showing a configuration example of a wireless communication system.
Fig. 2 is a diagram showing a configuration example of a wireless communication system in the downlink direction.
Fig. 3 is a diagram showing a configuration example of the main base station apparatus.
Fig. 4 is a diagram showing a configuration example of the slave base station apparatus.
Fig. 5 is a diagram showing a configuration example of the terminal device.
Fig. 6 is a diagram showing a configuration example of the scramble code generation unit.
Fig. 7 is a flowchart showing an operation example.
Fig. 8 is a flowchart showing an example of the action.
Fig. 9 is a diagram showing a configuration example of a radio communication system in the uplink direction.
Fig. 10 is a diagram showing a configuration example of the main base station apparatus.
Fig. 11 is a diagram showing a configuration example of the slave base station apparatus.
Fig. 12 is a diagram showing a configuration example of the terminal device.
Fig. 13 is a flowchart showing an operation example.
Fig. 14 is a flowchart showing an example of the action.
Fig. 15 is a diagram showing a configuration example of the terminal device.
Fig. 16 is a diagram showing a configuration example of the terminal device.
Fig. 17 is a diagram showing a configuration example of the base station apparatus.
Detailed Description
The following describes modes for carrying out the present invention. Fig. 1 is a diagram showing a configuration example of a wireless communication system 10. The radio communication system 10 includes 2 base station apparatuses (enbs, hereinafter, referred to as "base stations") 100-1 and 100-2 and a terminal apparatus (UE, hereinafter, referred to as "terminal") 200. The base stations 100-1, 100-2 transmit different data and the terminal 200 receives the data (downlink direction). Terminal 200 may transmit different data to base stations 100-1 and 100-2 (uplink direction). Both base stations 100-1, 100-2 and terminal 200 may perform so-called CoMP communication. Hereinafter, the description will be divided into a downlink direction (embodiment 1) and an uplink direction (embodiment 2). Note that, in 3GPP, a "cell" is defined as the same as a so-called "sector", and in the following embodiments, unless otherwise specified, a "cell" is described as a "sector".
< example 1 >
First, the downlink direction will be explained. Fig. 2 is a diagram showing a configuration example of the radio communication system 10 in the downlink direction. Of the 2 base stations 100-1, 100-2, the base station 100-1 is a master base station and the base station 100-2 is a slave base station. The master base station 100-1 is, for example, a base station that is connected to the terminal 200 before CoMP transmission is performed, and the slave base station 100-2 is, for example, a base station that performs CoMP transmission. The main base station 100-1 transmits a control signal to the terminal 200. The terminal 200 receives different transmission Data (DSCH) transmitted by the master base station 100-1 and the slave base station 100-2 according to the control signal.
< example of Main base station configuration >
A configuration example of the main base station 100-1 in embodiment 1 will be explained. Fig. 3 is a diagram showing the main base station 100-1.
The main base station 100-1 includes: an antenna 101, a reception radio unit 102, a demodulation/decoding unit 103, a connection request signal extraction unit 104, a radio channel control unit 105, a cell information signal generation unit 106, a CoMP communication request signal extraction unit 107, a CoMP communication implementation determination and control unit (hereinafter referred to as "control unit") 108, a radio channel quality information extraction unit 109, a scheduler 110, a control signal generation unit 111, a scrambling code generation unit 112, a transmission data buffer 113, an encoding/modulation unit 114, and a transmission radio unit 115.
The antenna 101 transmits and receives radio signals to and from the terminal 200.
The reception wireless unit 102 outputs a wireless signal received by the antenna 101 as a reception signal.
The demodulation/decoding unit 103 demodulates and decodes the reception signal output from the reception radio unit 102.
The connection request signal extraction unit 104 extracts a connection request signal from the received signal subjected to demodulation or the like. The connection request signal is, for example, a signal used when a line connection request is made between the terminal 200 and the main base station 100-1.
When the connection request signal is input from the connection request signal extraction unit 104, the radio network control unit 105 selects, for example, any one of a plurality of cell numbers and terminal numbers stored therein, and outputs the selected cell number and terminal number to the cell information signal generation unit 106 and the scramble code generation unit 112.
The cell information signal generation unit 106 generates cell information based on the cell number and the terminal number output from the radio network controller 105 and the slot number output from the scheduler 110. The generated cell information is transmitted as a cell information signal to a base station (for example, from the base station 100-2) that performs CoMP transmission. The cell information signal is also output to the coding/modulation section 114 to be transmitted to the terminal 200.
The CoMP communication request signal extraction unit 107 extracts a CoMP communication request signal from the reception signal output from the demodulation/decoding unit 103. The CoMP communication request signal is, for example, a signal transmitted from terminal 200 when terminal 200 desires CoMP communication.
The control unit 108 determines whether or not to perform CoMP transmission, and when determining to perform CoMP transmission, notifies the slave base station 100-2 of a CoMP transmission implementation notification. The control unit 108 determines whether or not to perform CoMP transmission, for example, based on the radio line quality output from the radio line quality information extraction unit 109 and the radio line quality transmitted from the base station 100-2. The CoMP transmission implementation notification is also output to the scheduler 110 and the cell information signal generation unit 106. The determination of CoMP transmission will be described in detail later.
The radio channel quality information extraction unit 109 extracts radio channel quality information from the received signal output from the demodulation/decoding unit 103. The radio link quality information is, for example, information transmitted from the terminal 200.
Scheduler 110 determines (performs scheduling) a coding rate, a modulation scheme, and the like used for downlink communication with terminal 200, based on the radio channel quality information output from radio channel quality information extracting unit 109. The scheduler 110 outputs scheduling information related to the determined coding rate and the like to the control signal generation unit 111. The scheduler 110 transmits the use frequency and the precoding information in the scheduling information to the slave base station 100-2 as a CoMP control signal, and outputs the slot number to the cell information signal generation unit 106 and the scrambling code generation unit 112. The scheduler 110 controls the encoding/modulation unit 114 and the transmission radio unit 115 based on the determined scheduling information, and performs encoding processing and the like on transmission data.
The control signal generator 111 generates a control signal including the scheduling information output from the scheduler 110 and outputs the control signal to the encoder/modulator 114.
The scrambling code generation unit 112 generates an initial value of a scrambling code and sequentially generates scrambling codes based on the slot number output from the scheduler 110 and the cell number and terminal number output from the radio network control unit 105. The scrambling code generator 112 will be described in detail later.
The transmission data buffer 113 temporarily stores transmission data transmitted from the main base station 100-1 to the terminal 200.
The coding/modulation section 114 scrambles the transmission data output from the transmission data buffer 113 using the scrambling code generated by the scrambling code generation section 112, and codes and modulates the scrambled transmission data in accordance with the scheduling information. The coding/modulation section 114 performs processing such as coding on the cell information output from the cell information signal generation section 106 and the control signal output from the control signal generation section 111, but may perform scrambling processing on them.
The transmission wireless unit 115 performs weighting processing (or weighting processing) of transmission data and the like on the transmission data and the like output from the coding/modulation unit 114 based on the precoding information generated by the scheduler 110. The transmitting wireless unit 115 generates, for example, a pilot signal (or a known signal). The output from the transmitting wireless unit 115 is transmitted as a wireless signal to the terminal 200 via the antenna 101.
< example of configuration of slave base station >
Next, a configuration example of the slave base station 100-2 in embodiment 1 is explained. The slave base station 100-2 has the same configuration as the master base station 100-1.
The control unit 108 receives the CoMP communication request signal from the CoMP communication request signal extraction unit 107, and when receiving the CoMP execution notification from the main base station 100-1, outputs the CoMP execution notification to the scheduler 110.
The scheduler 110 performs scheduling in the downlink direction based on the radio channel quality information output from the radio channel quality information extraction unit 109. The scheduler 110 receives the CoMP execution notification from the control unit 108, and performs scheduling for CoMP transmission when receiving the CoMP control signal from the main base station 100-1. The scheduler controls the encoding/modulation unit 114 and the transmission wireless unit 115 according to the schedule to perform encoding processing and the like.
The scrambling code generation unit 112 receives cell information from the main base station 100-1, generates an initial value of a scrambling code from the cell information, and sequentially generates scrambling codes. As will be described in detail later. Since the scrambling code generation section 112 generates a scrambling code from the cell information notified from the master base station 100-1, the master base station 100-1 and the slave base station 100-2 generate the same scrambling code. The generated scrambling code is output to the coding/modulation section 114, and the scrambling process is performed on the transmission data transmitted from the base station 100-2.
< example of terminal Structure >
Next, a configuration example of the terminal 200 will be described. Fig. 5 is a diagram showing a configuration example of terminal 200.
The terminal 200 includes: an antenna 201, a reception radio section 202, a demodulation/decoding section 203, a radio channel quality measurement and calculation section (hereinafter, referred to as a calculation section) 204, a radio channel quality information generation section 205, a cell information extraction section 206, a scramble code generation section 207, a reception control signal extraction section 208, a terminal setting control section 209, a reception power measurement section 210, a channel connection control section 211, a connection request signal generation section 212, an encoding/modulation section 213, a transmission radio section 214, a CoMP communication control section 220, and a CoMP communication request signal generation section 221.
The antenna 201 transmits and receives radio signals to and from the base stations 100-1 and 100-2.
The reception wireless unit 202 outputs a wireless signal received by the antenna 201 as a reception signal.
The demodulation section/decoding section 203 descrambles the received signal using the scramble code generated by the scramble code generation section 207, and demodulates and decodes the received signal in accordance with the demodulation scheme or the like set by the terminal setting control section 209.
The calculation unit 204 measures the radio quality of each radio channel with respect to the pilot signal or the like transmitted from the main base station 100-1 or the base station 100-2. The calculation unit 204 measures the wireless line quality by measuring, for example, the SINR (Signal to interference noise Ratio) of the pilot Signal.
The radio channel quality information generating unit 205 generates radio channel quality information based on the radio channel quality output from the calculating unit 204. The radio Channel Quality information is, for example, a CQI (Channel Quality Indicator) or the like. The generated radio channel quality information is output to the coding/modulation unit 213.
The cell information extracting unit 206 extracts cell information from the received signal output from the demodulating/decoding unit 203. The extracted cell information is output to the scrambling code generator 207.
The scramble code generation unit 207 generates an initial value of a scramble code based on cell information (including a cell number, a terminal number, and a slot number), and sequentially generates scramble codes. The scramble code generator 107 outputs the generated scramble code to the demodulator/decoder 203.
The reception control signal extraction unit 208 extracts a control signal from the reception signal and outputs the control signal to the terminal setting control unit 209.
The terminal setting control section 209 controls the reception radio section 202 and the demodulation/decoding section 203 so as to demodulate, decode, etc. the reception data from the base stations 1000-1, 100-2 based on the scheduling information included in the control signal.
The reception power measurement unit 210 measures the reception power of a pilot signal, for example, among the reception signals, and outputs the measurement result to the line connection control unit 211 and the CoMP communication control unit 220.
The line connection control unit 211 determines whether or not to connect a line to the base stations 100-1 and 100-2 based on the received power. The line connection control unit 211 determines to perform line connection when the received power is equal to or higher than a threshold, for example, and determines not to connect the lines when the received power is not equal to or higher than the threshold. When determining to perform line connection, the line connection control unit 211 outputs an instruction signal to the connection request signal generation unit 212.
The connection request signal generation unit 212 generates a connection request signal based on the instruction signal, and outputs the connection request signal to the encoding/modulation unit 213.
The CoMP communication control unit 220 outputs an instruction to generate a CoMP communication request signal to the CoMP communication request signal generation unit 221 when the reception power is, for example, equal to or higher than a threshold value.
The CoMP communication request signal generation unit 221 generates a CoMP communication request signal in accordance with an instruction from the CoMP communication control unit 220, and outputs the CoMP communication request signal to the coding/modulation unit 213.
The coding/modulation unit 213 performs coding and modulation processing on the radio channel quality information, the connection request signal, the CoMP communication request signal, and the like.
The transmission radio unit 214 controls transmission power of the radio link quality information and the like subjected to encoding and the like, and outputs the radio link quality information and the like to the antenna 201 as a radio signal. The radio link quality information and the like are transmitted as radio signals to the base stations 100-1 and 100-2.
< example of configuration of scrambling code Generation section >
Next, a configuration example of the master base station 100-1, the scramble code generation unit 112 of the slave base station 100-2, and the scramble code generation unit 207 of the terminal 200 will be described. Fig. 6 is a diagram showing a configuration example of the scramble code generating units 112 and 207, which is a known GOLD code generator.
The scramble code generation units 112 and 207 include 1 st and 2 nd registers (or flip-flops) 112-1 and 112-3 and 1 st to 3 rd exclusive OR logic circuits 112-2, 112-4 and 112-5.
The scramble code generation units 112 and 207 generate GOLD codes (or scramble codes) having a length of "31", and the output thereof is a scramble code c (n). The generator polynomial of the scrambling code c (n) is expressed by the above equations 2 to 4.
< example of operation in Downlink Direction >
Next, an operation example in embodiment 1 will be described. Fig. 7 and 8 are flowcharts showing operation examples. Here, terminal 200 is located in an area where both master base station 100-1 and slave base station 100-2 can be connected for communication.
First, main base station 100-1 reports cell information and the like to terminal 200 (S10). The cell information reported by the main base station 100-1 may include, for example, cell information (cell number, terminal and slot number) generated by the cell information signal generation unit 106.
Then, the main base station 100-1 transmits a pilot signal (S11). For example, the transmission radio unit 115 of the main base station 100-1 generates a pilot signal.
Then, the terminal 200 selects a cell to be communicated with based on the received pilot signal and the like (S12), and sets a line with the selected cell (S13). For example, the received power measuring unit 210 of the terminal 200 measures the received power of the pilot signal, and the line connection control unit 211 determines the connection of the line, thereby selecting a cell (for example, the main base station 100-1). Then, connection request signal generation unit 212 generates a connection request signal, transmits the generated connection request signal to main base station 100-1, and sets a line. The terminal 200 is initially connected to the main base station 100-1.
Then, the terminal 200 measures the quality (e.g., CQI) of the wireless line with the main base station 100-1 (S14), and transmits wireless line quality information to the main base station 100-1 (S15). For example, the calculation unit 204 of the terminal 200 measures the radio link quality from the pilot signal, and the radio link quality information generation unit 205 generates radio link quality information and transmits the information to the main base station 100-1.
Then, the main base station 100-1 performs scheduling according to the wireless line quality information (S16). For example, the scheduler 110 of the main base station 100-1 performs scheduling based on the radio link quality information extracted by the radio link quality information extraction unit 109.
Then, the main base station 100-1 performs transmission signal processing (S17). For example, the coding/modulation unit 114 reads the transmission data stored in the transmission data buffer 113, and performs processing such as coding according to the coding rate and the like scheduled by the scheduler 110. The coding/modulation unit 114 also performs processing such as coding on the control signal including the scheduling information generated by the control signal generation unit 111.
Then, the main base station 100-1 transmits the control signal and the transmission data to the terminal 200(S18, S19).
The terminal 200 performs received signal processing upon receiving the control signal and the transmission data (S20). For example, the terminal setting control unit 209 controls the reception radio unit 202 and the demodulation/decoding unit 203 to perform demodulation, decoding, and the like, based on the scheduling information included in the received control signal.
Then, the terminal 200 receives the pilot signal and the cell information reported from the base station 100-2 (S21, S22). The terminal 200 selects the slave base station 100-2 as a connection base station (S23), and establishes a line with the slave base station 100-2 (S24).
Then, the process for CoMP transmission is performed between terminal 200 and base stations 100-1 and 100-2. First, the terminal 200 receives pilot signals from the master base station 100-1 and the slave base station 100-2 (S25, S26), and measures the line quality of each wireless line (S27). For example, the calculation unit 204 of the terminal 200 measures the quality of each radio channel. In addition, at this time, in order to easily recognize the pilot signals from the master base station 100-1 and the slave base station 100-2, different pilot signals generated based on the cell number of the master base station 100-1 and the original cell number of the slave base station 100-2 may be provided.
Then, the terminal 200 transmits the measured radio channel qualities to the slave base station 100-2 and the master base station 100-1, respectively (S28, S30). For example, the radio link quality information generating unit 205 generates each radio link quality information and transmits the information.
The slave base station 100-2 transmits the wireless line quality information transmitted by the terminal 200 to the master base station 100-1 (S29). For example, the radio link quality information extraction unit 109 of the slave base station 100-2 transmits the extracted radio link quality with the terminal 200 to the master base station 100-1.
Then, the master base station 100-1 determines whether CoMP transmission is possible (S31). For example, when both the radio line quality from the slave base station 100-2 and the radio line quality extracted by the CoMP communication request signal extraction unit 107 are equal to or higher than the threshold, the control unit 108 of the master base station 100-1 determines that CoMP communication is possible. The threshold value for comparison with the quality of the wireless line from the master base station 100-1 and the threshold value for comparison with the quality of the wireless line from the slave base station 100-2 may be the same or different. When determining that CoMP transmission is not possible, the control unit 108 ends the series of processing.
Then, the terminal 200 transmits a CoMP transmission implementation request to the slave base station 100-2 and the master base station 100-1 (S32, S33). For example, CoMP communication control unit 220 of terminal 200 outputs an instruction to execute a request, and transmits the request signal from CoMP communication request signal generation unit 221.
When the master base station 100-1 determines that CoMP transmission is possible (S31) and receives a CoMP execution request from the terminal 200 (S33), it transmits a CoMP execution notification to the slave base station 100-2 and the terminal 200(S34, S35). For example, the control unit 108 of the master base station 100-1 transmits a CoMP execution notification to the slave base station 100-2. For example, the control unit 108 outputs the CoMP execution notification to the scheduler 110, and the scheduler 110 transmits the CoMP execution notification to the terminal 200 as a control signal.
Then, the master base station 100-1 and the slave base station 100-2 perform processing for acquiring synchronization between the base stations (S36). This is to transmit transmission data to terminal 200 in synchronization in CoMP transmission. For example, the control unit 108 of the master base station 100-1 and the slave base station 100-2 perform synchronization processing by transmitting and receiving signals to and from each other and synchronizing the phases.
Then, the master base station 100-1 performs scheduling for CoMP transmission (S37). For example, the scheduler 110 performs scheduling according to the radio channel quality (S29, S30) and the like when receiving the CoMP execution notification from the control unit 108. The generated scheduling information includes a use frequency and precoding information used for CoMP transmission.
Then, the master base station 100-1 transmits the cell information to the slave base station 100-2 (S38). For example, the cell information signal generation unit 106 receives the cell number and the terminal number from the radio network controller 105, receives the slot number output from the scheduler 110, generates cell information including the cell number, the terminal number, and the slot number, and transmits the cell information. For example, when performing a line setup with terminal 200 (S13), radio network controller 105 may generate a cell number and a terminal number, and cell information generator 106 may read the cell number from radio network controller 105, etc. when a CoMP execution notification from controller 108 is triggered. The time slot number may be output to the cell information generator 106 by the scheduler 110 through scheduling (S37). Further, terminal 200 may directly notify the measured and calculated radio link quality with slave base station 100-2 to master base station 100-1.
Then, the master base station 100-1 transfers transmission data (for example, transmission data 2) to the slave base station 100-2 (S39). For example, the scheduler 110 of the master base station 100-1 reads out a part (for example, transmission data 2) of the transmission data stored in the transmission data buffer 113 and transmits the same to the slave base station 100-2. The transmission data buffer 113 of the slave base station 100-2 stores the transmission data transmitted by the master base station 100-1. Transmission data 1 and transmission data 2 are, for example, transmission data different for each cell.
Then, the master base station 100-1 notifies the transmission control information to the slave base station 100-2 (S40). For example, the scheduler 110 transmits scheduling information including precoding information and the like (S37) as transmission control information to the slave base station 100-2.
Then, the master base station 100-1 performs transmission signal processing with the slave base station 100-2 (S41, S42). For example, the scrambling code generation unit 112 of the main base station 100-1 generates a scrambling code from the cell number and the terminal number from the radio network controller 105 and the slot number from the scheduler 110. The coding/modulation section 114 performs scrambling processing on the transmission data 1 using the scrambling code. Then, the transmission data 1 is encoded according to the schedule (S37). On the other hand, the scrambling code generator 112 of the slave base station 100-2 generates a scrambling code using the cell information transmitted from the master base station 100-1 (S38), and the encoder/modulator 114 performs scrambling processing on the transmission data 2. The transmission data 2 is encoded or the like based on the transmission control information transmitted from the main base station 100-1. In this way, the master base station 100-1 and the slave base station 100-2 generate a common scrambling code because they generate a scrambling code based on the common cell number, terminal number, and slot number.
Then, the main base station 100-1 transmits the control signal and the transmission data to the terminal 200(S43, S44). The control signal may include a used frequency and precoding information in addition to a coding rate used for CoMP transmission, and may also include cell information generated by the cell information signal generation unit 106.
Then, the slave base station 100-2 transmits transmission data (for example, transmission data 2) different from the transmission data transmitted by the master base station 100-1 to the terminal 200 (S45). For example, transmission data 1 and transmission data 2 are weighted and transmitted in accordance with the precoding information.
Then, terminal 200 performs reception signal processing on the transmission data transmitted by master base station 100-1 and slave base station 100-2 (S46). For example, the terminal setting control unit 209 of the terminal 200 controls the reception radio unit 202 and the demodulation/decoding unit 203 so as to be able to receive the transmission data from the master base station 100-1 and the slave base station 100-2, based on the scheduling information included in the control signal (S43). At this time, scrambling code generation section 207 of terminal 200 generates a scrambling code based on the cell information (S10 or S43). Since the cell information is the same as the information used in the master base station 100-1 and the slave base station 100-2, the terminal 200 can generate the same scrambling code as the scrambling codes generated in the base stations 100-1, 100-2. The demodulation/decoding section 203 performs descrambling processing on the transmission data 1 and the transmission data 2 based on the scrambling code.
As described above, in embodiment 1, when CoMP transmission is performed, the master base station 100-1 transmits the cell information to the slave base station 100-2 (S38), and therefore the information for generating the scrambling codes is shared, and a common scrambling code can be generated. Therefore, the radio communication system 10 can reduce the processing as compared with the case where scrambling processing is performed by generating different scrambling codes in the base stations 100-1 and 100-2. Further, since the processing is reduced, the power consumption of the terminal 200 and the base stations 100-1 and 100-2 can be reduced.
In addition, the master base station 100-1 transmits precoding information to the slave base station 100-2 (S40), and the 2 base stations 100-1, 100-2 transmit different data to the terminal 200 according to the precoding information. Therefore, even if different data is transmitted from 2 base stations 100-1 and 100-2 using a common scrambling code, terminal 200 can perform reception processing based on precoding information included in the control signal (S43 and S46), and thus can prevent 2 different data from being mixed and communicated.
< example 2 >
Next, an example of the uplink direction will be described. Embodiment 2 is an example of an uplink direction in which terminal 200 transmits data to base stations 100-1 and 100-2.
Fig. 9 is a diagram showing a configuration example of the wireless communication system 10 in embodiment 2. The main base station 100-1 transmits a control signal to the terminal 200. The terminal 200 transmits different transmission data (USCH) to the master base station 100-1 and the slave base station 100-2 according to the received control signal.
< example of Main base station configuration >
Next, a configuration example of the main base station 100-1 in embodiment 2 is explained. Fig. 10 is a diagram showing a configuration example of the main base station 100-1.
The main base station 100-1 further includes a wireless link quality measurement and calculation unit (hereinafter, referred to as a calculation unit) 121. The calculation unit 121 measures the radio channel quality with the terminal 200 based on the pilot signal or the like transmitted from the terminal 200, and measures the radio channel quality (for example, CQI).
In addition, since the scheduler 110 of the main base station 100-1 performs scheduling in the uplink direction, the demodulation/decoding unit 103 and the reception radio unit 102 are controlled based on the generated scheduling information.
Further, since the scramble code generation unit 112 performs descrambling processing on transmission data or the like transmitted from the terminal 200, the generated scramble code is output to the demodulation/decoding unit 103.
< example of configuration of slave base station >
Next, a configuration example of the slave base station 100-2 in embodiment 2 is explained. Fig. 11 is a diagram showing a configuration example of the slave base station 100-2.
The slave base station 100-2 also includes a calculation unit 121.
Since the scheduler 110 of the base station 100-2 performs uplink scheduling, the demodulation/decoding unit 103 and the reception radio unit 102 are controlled based on the scheduling information.
Further, since the scramble code generation unit 112 performs descrambling processing on transmission data or the like transmitted from the terminal 200, the generated scramble code is output to the demodulation/decoding unit 103.
< example of terminal Structure >
Next, a configuration example of the terminal 200 in embodiment 2 is explained. Fig. 12 is a diagram showing a configuration example of terminal 200. The present terminal 200 also has the same configuration as the terminal 200 (fig. 5) in the downlink direction.
The terminal setting control unit 209 controls the coding/modulation unit 213 to perform processing such as coding of transmission data and the like to be transmitted to the base stations 100-1 and 100-2 in accordance with the control signal. The terminal setting control unit 209 controls the transmission radio unit 214 based on the precoding information included in the control signal, weights different transmission data, and transmits the weighted transmission data to the base stations 100-1 and 100-2.
The scramble code generator 207 scrambles the transmission data and the like transmitted to the base stations 100-1 and 100-2, and outputs the generated scramble code to the encoder/modulator 213.
< example of configuration of scrambling code Generation section >
Scrambling code generation sections 112 and 207 of base stations 100-1 and 100-2 and terminal 200 are the same as those in embodiment 1.
< example of operation in upstream direction >
Next, an operation example in embodiment 2 will be described. Fig. 13 and 14 are flowcharts showing operation examples.
After the line setting is performed between the main base station 100-1 and the terminal 200 (S10 to S13), the terminal 200 transmits a pilot signal to the main base station 100-1 (S50). For example, the transmission radio unit 214 of the terminal 200 generates and transmits a pilot signal. The cell information (S10) transmitted by the main base station 100-1 may include the cell information generated by the cell information signal generation unit 106.
Then, the main base station 100-1 measures the uplink radio channel quality (for example, CQI) from the pilot signal (S51). For example, the calculation unit 121 of the main base station 100-1 performs measurement and the like.
Then, the main base station 100-1 performs uplink scheduling based on the measured radio link quality (S16). For example, the scheduler 110 performs scheduling according to the radio channel quality output from the calculation unit 121.
Then, the main base station 100-1 transmits a control signal including uplink scheduling information (S18), and the terminal 200 performs transmission signal processing based on the control signal (S52). For example, the control signal generating unit 111 of the main base station 100-1 generates a control signal including scheduling information and transmits the control signal via the coding/modulation unit 114 or the like. Further, coding/modulation section 213 of terminal 200 performs coding and modulation processing on transmission data based on scheduling information included in the received control signal.
Then, the terminal 200 transmits the transmission data to the main base station 100-1 (S53).
Then, the terminal 200 performs a process such as a line setup with the slave base station 100-2 (S21 to S24). Further, the process for CoMP transmission is performed between terminal 200 and base stations 100-1 and 100-2.
First, terminal 200 transmits a CoMP transmission execution request to each base station 100-1, 100-2 (S32 to S33). For example, when the reception power of each radio channel quality is equal to or higher than the threshold, CoMP communication control unit 220 of terminal 200 instructs CoMP transmission execution request. The CoMP communication request signal generation unit 221 generates a CoMP communication request signal in accordance with the instruction and transmits the CoMP communication request signal to the base stations 100-1 and 100-2.
Then, the terminal 200 transmits a pilot signal to each base station 100-1, 100-2 (S54, S55).
Then, each base station 100-1, 100-2 measures the radio link quality (S56, S57). For example, the calculation unit 121 of each base station 100-1, 100-2 measures the radio link quality.
Then, the slave base station 100-2 transmits the measured radio link quality to the master base station 100-1 (S58). For example, the radio link quality measured by the calculation unit 121 of the slave base station 100-2 is transmitted to the master base station 100-1.
Then, the main base station 100-1 determines CoMP transmission based on the quality of 2 radio links (S31). For example, the control unit 108 determines to perform CoMP transmission when the 2 radio link qualities are all equal to or higher than a threshold value. The threshold value to be compared with the radio link quality measured and calculated by the main base station 100-1 and the threshold value to be compared with the radio link quality measured and calculated by the base station 100-2 may be the same or different.
When performing CoMP transmission, the master base station 100-1 transmits a CoMP transmission execution notification to the slave base station 100-2 and the terminal 200(S34 to S35).
Then, the master base station 100-1 and the slave base station 100-2 perform synchronization processing (S36), and after scheduling for CoMP transmission is performed (S37), the cell information is notified to the slave base station 100-2 in the same manner as in embodiment 1 (S38). The cell information includes a cell number, a terminal number, and a slot number.
Then, the master base station 100-1 transmits transmission control information including scheduling information for transmission data in the uplink direction and the like (S37) to the slave base station 100-2 (S40), and transmits a control signal to the terminal 200 (S43). The control signal may include the cell information generated by the cell information signal generation unit 106. The transmission control information and the control signal also include a use frequency and precoding information.
Then, the terminal 200 performs transmission signal processing according to the received control signal (S59). For example, the scrambling code generator 207 generates a scrambling code from the cell information (S10 or S43) extracted by the cell information extractor 206, and outputs the generated scrambling code to the encoder/modulator 213. The coding/modulation unit 213 performs scrambling processing using the same (or common) scrambling code for transmission data 1 and transmission data 2 that are different for each cell, for example. Further, the terminal setting control unit 209 of the terminal 200 controls the encoding/modulation unit 213 to perform processing such as encoding based on the received scheduling information. The terminal setting control unit 209 controls the transmission wireless unit 214 to output transmission data weighted according to precoding information included in the control signal.
Then, the terminal 200 transmits different transmission data (e.g., transmission data 1 and transmission data 2) to the master base station 100-1 and the slave base station 100-2, respectively (S60, S61). For example, the transmission radio unit 214 outputs transmission data weighted according to precoding information included in the control signal.
Then, the main base station 100-1 performs reception signal processing on the transmission data 2 (S62). For example, the scrambling code generation unit 112 of the main base station 100-1 generates a scrambling code based on the slot number (S37) determined by the scheduler 110, the cell number and the terminal number from the radio network controller 105. The generated scrambling code is output to the demodulation/decoding unit 103, and descrambling processing is performed on the transmission data 2. Then, the demodulation/decoding unit 103 performs processing such as demodulation and decoding on the transmission data.
Further, the base station 100-2 performs received signal processing on the transmission data 1 (S63). For example, the scrambling code generator 112 of the slave base station 100-2 generates a scrambling code based on the cell information (S38) transmitted from the master base station 100-1. The generated scrambling code is output to the demodulation/decoding unit 103, and the descrambling processing is performed on the transmission data 1. For example, the base stations 100-1, 100-2 perform descrambling processing on the transmission data 1 or the transmission data 2, respectively, using the same scrambling code as that employed in the scrambling processing by the terminal 200.
Then, the slave base station 100-2 transfers the transmission data 1 subjected to demodulation or the like to the master base station 100-1 (S64). For example, the demodulation/decoding unit 103 of the slave base station 100-2 transmits the transmission data 1 to the master base station 100-1 according to the control of the scheduler 110 and the like.
In this way, in the present embodiment 2, the master base station 100-1 also transmits the cell information to the slave base station 100-2 (S38), and therefore the slave base station 100-2 generates the same scrambling code as the master base station 100-1. In addition, since cell information is also transmitted from main base station 100-1 to terminal 200, terminal 200 can generate the same scrambling code as that of base stations 100-1 and 100-2. Therefore, the present wireless communication system 10 can achieve a reduction in processing compared to the case of generating a different scrambling code. Further, terminal 200 on the transmitting side and each of base stations 100-1 and 100-2 on the receiving side do not generate different scrambling codes, and therefore, power consumption can be reduced.
< other examples >
Next, other embodiments will be described. The above embodiments describe an example in which the main base station 100-1 determines CoMP transmission (S31 and the like in fig. 8). For example, the terminal 200 may perform the determination. For example, CoMP communication control unit 220 of terminal 200 may determine whether or not both are equal to or greater than a threshold value based on the measured radio communication quality (S27 in fig. 7). In this case, the measured wireless communication quality is not transmitted to the base stations 100-1 and 100-2, and therefore, the processing of the main base station 100-1 can be further reduced.
In addition, the above embodiments describe examples in which terminal 200 requests CoMP transmission. Instead, the implementation request may be made by the master base station 100-1, for example. In the downlink direction, for example, when determining that the master base station 100-1 performs CoMP transmission (S31), a CoMP execution request may be transmitted to the terminal 200 and the slave base station 100-2. Then, the main base station 100-1 can be implemented by notifying the implementation notification (S34, S35). In the uplink direction, after the CoMP transmission determination (S31), a CoMP transmission request may be transmitted to terminal 200 or the like and the CoMP implementation notification may be notified (S34 to S35). Fig. 15 (downlink direction) and fig. 16 (uplink direction) show configuration examples of the terminal 200 at this time. In comparison with the above-described embodiment, terminal 200 does not include CoMP communication control unit 220 and CoMP communication request signal generation unit 221, and therefore can further reduce power consumption.
Further, the above-described embodiments have explained examples in which the transmission data is transmitted by 2 base stations 100 of the master base station 100-1 and the slave base station 100-2. For example, the transmission data may be transmitted by 1 base station 100 having a plurality of cells (or sectors). Fig. 17 is a diagram showing a configuration example of the base station apparatus 100. The base station device 100 includes a master communication unit 150-1, a slave communication unit 150-2, and antennas 101-1 and 101-2 connected to the respective communication units 150-1 and 150-2. The master communication unit 150-1 has the respective units 102 and the like in the master base station 100-1, and the slave communication unit 150-2 has the respective units 102 and the like in the slave base station 100-2. For example, the slave communication unit 150-2 outputs the radio link quality information to the master communication unit 150-1, and the master communication unit 150-1 outputs the cell information to the slave communication unit 150-2. Thus, the base station 100 can be implemented in both the downlink direction and the uplink direction in the same manner as in embodiments 1 and 2.
In each of the above embodiments, the cell number, the terminal number, and the slot number used for CoMP transmission may be set as a cell number, a terminal number, and a slot number dedicated to CoMP. For example, when the control unit 108 of the main base station 100-1 determines to perform CoMP transmission (S31), it outputs a notification thereof to the cell information signal generation unit 106. The cell information signal generation unit 106 may rewrite the cell number, the terminal number, and the slot number to respective numbers dedicated to CoMP in response to the notification. In addition, since the cell information signal generation unit 106 generates cell information and transmits the cell information to the slave base station 100-2, the slave base station 100-2 can also generate a scrambling code similar to that of the master base station 100-1.
In addition, the above embodiments describe examples of CoMP transmission between 2 base stations 100-1 and 100-2 and terminal 200. For example, CoMP transmission may be performed between 3 or more base stations 100 and terminal 200. In this case, one of the 3 or more base stations is a master base station, and the other base stations are slave base stations, and the cell information may be transmitted from the master base station to the plurality of slave base stations in the same manner as in the above embodiments.
Description of the symbols
10: wireless communication system 100: base station device (base station)
100-1: main base station 100-2: slave base station
103: demodulation/decoding unit 105: wireless line control unit
106: cell information signal generation unit 107: CoMP communication request signal extraction unit
108: CoMP communication implementation determination and control unit (control unit)
109: radio channel quality information extraction unit 110: scheduler
111: control signal generation unit 112: scramble code generation unit
114: encoding/modulation section 150-1: master communication unit
150-2: the slave communication unit 200: terminal equipment (terminal)
203: demodulation/decoding section 204: wireless line quality measuring and calculating part (calculating part)
205: radio channel quality information generation unit 206: cell information extraction unit
207: scrambling code generation unit 208: reception control signal extraction unit
209: terminal setting control unit 210: received power measuring unit
213: encoding/modulation section 220: CoMP communication control unit
221: CoMP communication request signal generation unit
Claims (11)
1. A wireless communication system for performing wireless communication between a 1 st base station device and a 2 nd base station device and a terminal device, wherein the 1 st base station device and the 2 nd base station device perform data transmission between base station devices having 1 or more cells or sectors, respectively,
the 1 st base station device has a transmission unit that transmits transmission data to be transmitted to the terminal device to the 2 nd base station device,
the 1 st base station device and the 2 nd base station device each include:
a processing unit that, when transmitting the transmission data to the terminal device for each of the cells or the sectors, performs scrambling processing on the transmission data using a common scrambling code; and
a transmission unit that transmits the transmission data after the scrambling process to the terminal devices,
the terminal device includes a reception unit that receives the transmission data and descrambles the transmission data using the common scrambling code.
2. The wireless communication system of claim 1,
the 1 st base station device includes a scheduler for generating precoding information,
the scheduler transmits the precoding information to the 2 nd base station apparatus,
each of the transmitting units of the 1 st base station device and the 2 nd base station device weights the transmission data based on the precoding information and transmits the transmission data to the terminal device.
3. A wireless communication method in a wireless communication system for performing wireless communication between a 1 st base station apparatus and a 2 nd base station apparatus and a terminal apparatus, wherein the 1 st base station apparatus and the 2 nd base station apparatus perform data transmission between base station apparatuses having 1 or more cells or sectors, respectively,
the 1 st base station apparatus transmits transmission data transmitted to the terminal apparatus to the 2 nd base station apparatus,
the 1 st base station apparatus and the 2 nd base station apparatus, when transmitting the transmission data to the terminal apparatus for each of the cells or the sectors, scramble the transmission data using a common scrambling code, and transmit the transmission data after the scrambling process to the terminal apparatus,
and the terminal device receives the sending data and uses the common scrambling code to descramble the sending data.
4. A base station apparatus which performs data transmission with another base station apparatus having 1 or more cells or sectors and performs wireless communication with a terminal apparatus together with the other base station apparatus,
the base station device includes:
a transmission unit that transmits transmission data to be transmitted to the terminal device to the other base station device;
a processing unit that, when transmitting the transmission data to the terminal apparatus together with the other base station apparatus for each of the cells or the sectors, performs scrambling processing on the transmission data using a common scrambling code; and
a transmission unit configured to transmit the transmission data subjected to the scrambling process to the terminal device.
5. A terminal device which performs wireless communication with a 1 st base station device and a 2 nd base station device, wherein the 1 st base station device and the 2 nd base station device perform data transmission between base station devices having 1 or more cells or sectors, respectively,
the terminal device includes a reception unit that receives, when transmission data transmitted from the 1 st base station device and the 2 nd base station device to the 2 nd base station device from the 1 st base station device and the 2 nd base station device, the transmission data scrambled by the respective transmission data using a common scrambling code, and descrambles the transmission data using the common scrambling code.
6. A wireless communication system for performing wireless communication between a 1 st base station device and a 2 nd base station device and a terminal device, wherein the 1 st base station device and the 2 nd base station device perform data transmission between base station devices having 1 or more cells or sectors, respectively,
the terminal device includes:
a processing unit that performs scrambling processing on transmission data to be transmitted to the 1 st base station apparatus and the 2 nd base station apparatus for each of the cells or the sectors, using a common scrambling code; and
a transmission unit that transmits the transmission data subjected to the scrambling process to the 1 st base station device and the 2 nd base station device, respectively,
the 1 st base station device and the 2 nd base station device each have a receiving unit that receives the transmission data and performs descrambling processing on the transmission data using the common scrambling code,
the 2 nd base station device includes a transmission unit that transmits the descrambled data to the 1 st base station device.
7. A wireless communication method in a wireless communication system for performing wireless communication between a 1 st base station apparatus and a 2 nd base station apparatus and a terminal apparatus, wherein the 1 st base station apparatus and the 2 nd base station apparatus perform data transmission between base station apparatuses having 1 or more cells or sectors, respectively,
the terminal device performs scrambling processing on transmission data to be transmitted to the 1 st base station device and the 2 nd base station device for each of the cells or the sectors using a common scrambling code, and transmits the transmission data subjected to the scrambling processing to the 1 st base station device and the 2 nd base station device, respectively,
the 1 st base station apparatus and the 2 nd base station apparatus receive the transmission data, perform descrambling processing on the transmission data using the common scrambling code,
the 2 nd base station apparatus transmits the descrambled data to the 1 st base station apparatus.
8. A base station apparatus which performs data transmission with another base station apparatus having 1 or more cells or sectors and performs wireless communication with a terminal apparatus together with the other base station apparatus,
the base station device includes:
a reception unit that receives transmission data, which is transmitted to the base station apparatus and the other base station apparatus for each of the cells or the sectors, and which is scrambled using a common scrambling code, and that performs descrambling using the common scrambling code; and
a transmission unit that transmits the descrambled data to the other base station apparatus.
9. A terminal device which performs wireless communication with a 1 st base station device and a 2 nd base station device, wherein the 1 st base station device and the 2 nd base station device perform data transmission between base station devices having 1 or more cells or sectors, respectively,
the terminal device includes:
a processing unit that performs scrambling processing on transmission data to be transmitted to the 1 st base station apparatus and the 2 nd base station apparatus for each of the cells or the sectors, using a common scrambling code; and
and a transmission unit configured to transmit the transmission data subjected to the scrambling process to the 1 st base station device and the 2 nd base station device, respectively.
10. A wireless communication system for performing wireless communication between a base station device having a plurality of sectors and having a 1 st communication unit and a 2 nd communication unit associated with each sector and a terminal device,
the 1 st communication section of the base station device has a transfer section that transfers transmission data transmitted to the terminal device to the 2 nd communication section,
the 1 st communication unit and the 2 nd communication unit of the base station device each include:
a processing unit that performs scrambling processing on the transmission data using a common scrambling code when transmitting the transmission data to the terminal device for each sector; and
a transmission unit that transmits the transmission data subjected to the scrambling processing to the terminal devices,
the terminal device includes a reception unit that receives the transmission data and descrambles the transmission data using the common scrambling code.
11. A wireless communication system for performing wireless communication between a base station device having a plurality of sectors and having a 1 st communication unit and a 2 nd communication unit associated with each sector and a terminal device,
the terminal device includes:
a processing unit that performs scrambling processing on transmission data transmitted for each of the sectors using a common scrambling code; and
a transmission unit that transmits the transmission data subjected to the scrambling processing to a base station apparatus,
the 1 st communication unit and the 2 nd communication unit of the base station device each have a reception unit that receives the transmission data and descrambles the transmission data using the common scrambling code,
the 2 nd communication unit of the base station device includes a transmission unit that transmits the descrambled data to the 1 st communication unit.
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| CN200980159884.2A CN102804620B (en) | 2009-06-15 | 2009-06-15 | Wireless communications method in wireless communication system, base station apparatus, terminal installation and wireless communication system |
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