JP3374972B2 - Channel allocation method and apparatus - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a channel allocation method and apparatus for allocating a communication channel to a terminal when a plurality of terminals communicate with a base station.

[0002]

2. Description of the Related Art With the recent increase in demand for mobile communication, it is required to construct a wireless communication system capable of accommodating many terminals. Currently, one base station accommodates many terminals in the base station by multiplexing signals of many terminals in a time-frequency domain using a plurality of frequencies and communication slots. However, due to the tight radio frequency situation, recently, not only the time-frequency domain multiplexing scheme, but also the spatial domain multiplexing scheme are being studied. Such a method is based on the space division multiple access method (SD
It is called MA (space division multiple access). The SDMA system is a system in which a plurality of directional beams are used in one base station to individually receive terminal signals in different directions to which the same communication slot is assigned, for example. An adaptive array antenna is often used for forming a directional beam. At the present time when the adaptive array antenna technology is approaching the practical stage, the SDMA method is regarded as a multiplexing method suitable for accommodating a large number of terminals.

In realizing the SDMA method, it is determined which communication slot is used for communication from the transmission of a call request from the terminal within the service area (cell) of the base station to the communication. A process is needed.
Such a series of processes is called "channel allocation processing". A channel allocation method using the SDMA method is proposed by the present applicant as Japanese Patent Application No. 2000-9096. The contents will be briefly described below.

A base station that performs channel allocation to a new terminal using the above channel allocation method is equipped with a base station antenna including, for example, four antenna elements. The received signal received by this base station antenna is the signal vector U
Is expressed as U = [a ₁ a ₂ a ₃ a ₄ ] ^T (1) In the above formula (1), a ₁ , a ₂ , a ₃ and a ₄ are respectively received by the four antenna elements of the base station antenna. It represents a complex signal, and the subscript " ^T " represents the transposed matrix. The channel format used for communication is composed of a control slot in which time is divided in one frequency band and a plurality of communication slots. The control slot is used when setting a channel such as a call request signal of the terminal, and the plurality of communication slots are used as channels when actually performing communication. In addition, SD
In the MA method, one communication slot can be simultaneously used by a plurality of terminals. That is, the channels used by a plurality of terminals can be set in one communication slot, and the signals of each terminal can be detected by spatially separating the channels of a plurality of terminals using an adaptive array.

To explain the control procedure of the SDMA channel allocation method, the base station always holds a channel table in the communication state storage unit and stores the correlation matrix Φ corresponding to each channel. Here, the correlation matrix Φ is a vector having the cross-correlation of the amplitude between the element antennas as an element, and the (i, j) term of the correlation matrix Φ is represented by the following expression (2). Φ (i, j) = E [a _i ^* × a _j ] (2) Here, the subscript “*” represents a complex conjugate, E [] represents an average in parentheses, and a _i , a _j are The complex amplitudes of the i-th and j-th antenna elements are shown. Therefore, the base station can obtain the correlation matrix Φ by measuring the correlation between the elements.

If the correlation matrix Φ is written in another notation,
It can also be expressed in the form of the following expression (3). Φ = Σ _{n = 1} ^N U _n U _n ^H + P _N I (3) where U _n is the nth signal vector in the communication slot, P _N is the noise power, I is the unit matrix, and the subscript “ ^H ”. Represents transposed conjugate. If there is no terminal in communication in the slot, the correlation matrix Φ is calculated only by the term related to noise power. In this way, the correlation matrix Φ is calculated even when there is no terminal in communication, and the calculated correlation matrix Φ is always stored in the base station.

When a new call request is made at a new terminal in the cell, the new terminal uses the control slot to notify the base station to that effect. At this time, the base station recognizes the terminal ID of the new terminal after receiving the control signal,
The signal vector U _{d for} the new terminal is calculated. The calculation of the signal vector U _d is performed by formula (1) using a matched filter corresponding to a known signal in the control signal for each element antenna and using the output of the matched filter as an element of the vector.

Then, using the signal vector U _d of the new terminal and the correlation matrix Φ _n stored in the channel table,
When the new terminal is accommodated in the communication slot n and the signal is received using the adaptive array antenna, the "predicted signal power" to the "interference signal + noise" power ratio (SINR: Signal-to- Interference-plus-noisepow
er ratio) γ can be calculated by the following equation (4). γ = U _d ^H Φ _n ⁻¹ U _d (4) Here, the subscript “ ⁻¹ ” represents an inverse matrix. The predicted SINR γ calculated from the equation (4) is the SIN after signal combination by the adaptive array when the new terminal uses the communication slot n and communicates at the same transmission power as the control signal.
Represents R. Therefore, when a new terminal is accommodated in each communication slot n, the predicted SI of the received signal of the new terminal
NRγ _n can be calculated by the above equation (4).

Predicted SINR is the bit error rate of the received signal
It also has a close relationship with (BER: Bit Error Rate).
Is an important indicator of communication quality. Also, SINR
The larger is, the better the communication quality is. Therefore,
Allocation of communication slots to allocate channels for new terminals
As a complement, the communication slot n with the maximum predicted SINR is
New terminal allocation candidate. At the same time, the system
Required SINR required SINRγ_reqAs in advance
It is set. Therefore, communication slots that are allocation candidates
Predicted SINR γ_nAnd required SINRγ_reqCompare with
I, predicted SINRγ _nCan be assigned if
As a function, the channel of the new terminal is set to the communication slot n.
It And the required SINRγ_reqWhen is larger
Cannot allocate the required SINR and
It is judged impossible to hit.

The result of such communication slot allocation is notified to the new terminal using the utilization channel notification unit in the base station. If the communication slot can be assigned to the new terminal, the new terminal starts communication using the notified communication slot. Also, the base station receives the signal using the adaptive array antenna and demodulates it in the communication receiving unit. As described above, in the above channel allocation method, the predicted SINR for the new terminal is calculated at the base station, and the channel of the new terminal is set in the communication slot with the maximum value, so that the channel allocation corresponding to the SDMA method can be performed. It was possible.

[0011]

However, in the above channel allocation method, the communication quality of a new terminal is predicted SI.
Signal quality is secured by NR evaluation,
Regarding the communication quality of the terminal during communication, there is no guarantee that the communication quality will be secured in the channel allocation process. That is, the required SINR is ensured by the above-described channel allocation process even at the start of communication even for the terminal during communication. But,
After that, if another terminal is assigned in the same communication slot, the SINR value of the terminal during communication may deteriorate. That is, if the SINR value of the terminal in communication deteriorates due to the addition of a new terminal, the SINR is required SI.
It is assumed that the NR becomes equal to or lower than NR, and in such a case, there is a problem that the communication quality of the terminal during communication cannot be sufficiently secured.

Further, in the above-described channel allocation method, the adaptive array antenna is used to perform optimum combining. However, in mobile communication, although a combination method other than the optimum combination such as the maximum ratio combination method can be considered, there is a problem that it cannot be applied when a combination method other than the optimum combination is used. Furthermore, the above channel allocation method is
Channel allocation is performed by regarding the power of the control signal from the new terminal as the power value when the new terminal communicates. However, when mobile communication is performed, the transmission power of the terminal is also controlled by transmission power control, but there is a problem that it cannot be applied to a communication system that performs transmission power control.

[0013] Therefore, it is a first object of the present invention to provide a channel allocation method and apparatus capable of sufficiently ensuring the communication quality of a terminal in communication even if a new terminal is accommodated. Further, the present invention is based on the CDMA system and SD.
A second object is to provide a channel allocation method and apparatus applicable even when combined with the MA method. A third object of the present invention is to provide a channel allocation method and apparatus that can be applied even when a combining method other than the optimum combining method is used. Furthermore, a fourth object of the present invention is to provide a channel allocation method and apparatus applicable to a communication system for controlling transmission power.

[0014]

In order to achieve the above first object, a first channel allocation method of the present invention is a channel allocation method in a multiple access system using a time domain and a spatial domain, When the new terminal is accommodated in each communication slot of the communication slot allocation candidates, the communication slot in which the predicted signal-to-interference power ratio of the new terminal is large when assuming that the new terminal is accommodated is set as the communication slot allocation candidate. A communication slot that can secure the predicted signal-to-interference power ratio of all terminals in communication at a predetermined level or higher is selected from the communication slot allocation candidates and is allocated as a communication slot for setting the channel of the new terminal.

Another first channel allocation method of the present invention which can achieve the above first object is a channel allocation method in a multiple access system using a time domain and a space domain, in which a new terminal is accommodated. When the expected signal-to-interference power ratio of the new terminal when it is assumed that the communication slot allocation candidate is a communication slot allocation candidate, when accommodating the new terminal in each communication slot of the communication slot allocation candidate,
A communication slot is provided in which the predicted signal-to-interference power ratio of the new terminal can be secured at a predetermined level or more, and the predicted signal-to-interference power ratio of the terminal in communication can be secured at a predetermined level or more different from the predetermined level of the new terminal. The channel is selected from the slot allocation candidates and is allocated as a communication slot for setting the channel of the new terminal.

Still another first channel allocation method of the present invention which can achieve the above first object is a channel allocation method in a multiple access system using a time domain and a space domain, in which a new terminal is Calculate the predicted signal-to-interference power ratio of the new terminal in the communication slot when it is assumed to be accommodated, give priority to the communication slot in ascending order of the calculated predicted signal-to-interference power ratio, and give priority. As communication slot allocation candidates in order of rank, each communication slot of the communication slot allocation candidates, when accommodating the new terminal, a communication slot that can secure the predicted signal-to-interference power ratio of all terminals in communication at a predetermined level or more, The communication slot allocation candidates are selected in the order of priority and are allocated as communication slots for setting the channel of the new terminal.

Still another first channel allocation method of the present invention that can achieve the above first object is a channel allocation method in a multiple access system using a time domain and a spatial domain, and a new terminal When a new terminal is accommodated in a communication slot allocation candidate by assigning a priority to communication slots to be accommodated at random and making the communication slot allocation candidates in the order of priority, the predicted signal-to-interference power ratio of the new terminal is accommodated. And a communication slot that can secure a predicted signal-to-interference power ratio of all terminals in communication when the new terminal is accommodated in the communication slot allocation candidate communication slot, Select from the communication slot allocation candidates in the order of priority and allocate them as communication slots for setting the channel of the new terminal. .

Further, in the first channel allocation method according to the present invention, inter-element correlation information for each communication slot in an antenna means having a plurality of antenna elements, and weight information set for the plurality of antenna elements. May be used to calculate the predicted signal-to-interference power ratio of the new terminal and the predicted signal-to-interference power ratio of all terminals in communication, thereby achieving the third object. Furthermore, in the first channel allocation method according to the present invention, inter-element correlation information for each of the communication slots in an antenna means including a plurality of antenna elements,
Using the received information replaced by the transmission power of the new terminal being transmission power controlled, the predicted signal to interference power ratio of the new terminal and the predicted signal to interference power ratio of all terminals in communication are calculated. In this way, the fourth object may be achieved. Furthermore, the first channel allocation method according to the present invention may be provided with a distributed antenna means including a plurality of antenna elements.

Next, a second channel allocation method of the present invention that can achieve the above second object is a channel allocation method in a code-space division multiple access system, in which a new terminal is accommodated. If the predicted signal to interference ratio of the new terminal in the case of assuming that can be secured above a predetermined level, which is adapted to accommodate the new terminal, the current
Interference parameter that indicates the state of interference based on the communication state of
Held prior to the channel allocation process,
A parameter indicating the communication status of the new terminal when performing the allocation process.
The predicted signal pair based on the interference parameter and the interference parameter.
The interference power ratio is calculated . In addition, the second
Another second channel allocation method of the present invention that can achieve the above object is a channel allocation method in a code-space division multiple access system, and it is assumed that a new terminal is accommodated. When the predicted signal-to-interference power ratio of the terminal can be large, when accommodating the new terminal, if the predicted signal-to-interference power ratio of all terminals in communication can be secured at a predetermined level or higher, the new terminal is It is designed to accommodate the interference status based on the current communication status.
Holds the indicated interference parameters prior to the channel allocation process
In addition, when performing channel allocation processing, the new terminal
The first parameter indicating the communication status, the communication status of the communicating terminal
Based on the second parameter shown and the interference parameter
In addition, the predicted signal-to-interference power ratio is calculated .

Further, in the second channel allocation method according to the present invention, the inter-element correlation information in the antenna means having a plurality of antenna elements and the weight information set in the plurality of antenna elements are used to perform the above The predicted signal-to-interference power ratio of the new terminal and the predicted signal-to-interference power ratio of all terminals in communication are calculated, and the third terminal is used.
The purpose of may be achieved. Further, in the second channel allocation method according to the present invention, the inter-element correlation information in the antenna means including a plurality of antenna elements and the reception information replaced as the transmission power of the new terminal is transmission power controlled are provided. The predicted signal-to-interference power ratio of the new terminal and the predicted signal-to-interference power ratio of all terminals in communication are calculated by using the fourth terminal.
The purpose of may be achieved. Furthermore, in the second channel allocation method according to the present invention, distributed antenna means having a plurality of antenna elements may be provided.

A first channel assignment device and a second channel assignment device of the present invention are hardware implementations of the above-described first channel assignment method and second channel assignment method of the present invention. The above-mentioned first to fourth objects can be achieved respectively.

According to the present invention as described above, when a new terminal is accommodated in each communication slot of the communication slot allocation candidates,
The communication slot that can secure the predicted signal-to-interference power ratio of all terminals in communication at a predetermined level or more is selected from the communication slot allocation candidates, so that the communication quality of the terminal in communication is sufficient even if a new terminal is accommodated. Will be able to secure. Further, when the predicted signal-to-interference power ratio of the terminal being communicated is allocated as a communication slot for setting the channel of the new terminal, a communication slot capable of ensuring a small predetermined level different from the predetermined level of the new terminal,
It becomes possible to smoothly accommodate new terminals.

Further, when it is assumed that a new terminal is accommodated, a priority order is given to the communication slots of the new terminals in the communication slots in the ascending order of the calculated predicted signal to interference power ratio, and the communication slots are arranged in the order of priority. If it is set as an allocation candidate, many channels can be accommodated in one communication slot, and at the same time, a communication slot with a low utilization state can be created. In this way, by providing a difference in the usage state depending on the communication slot, it becomes possible to make the unused communication slot easy to use in another base station or the like. Furthermore, if a communication slot accommodating a new terminal is randomly assigned a priority and the communication slot allocation candidates are in the order of priority, the predicted signal of the new terminal in all the communication slots when the new terminal is assumed to be accommodated. There is no need to calculate the interference power ratio. That is, since the predicted signal-to-interference power ratio of the new terminal has to be performed only for the communication slots required after the priority order is determined, the calculation amount can be reduced.

Furthermore, the predicted signal-to-interference power ratio of the new terminal and the predicted signal-to-interference power ratio of all terminals in communication are used by using the inter-element correlation information in the antenna means and the weight information set in the antenna means. By calculating, it becomes possible to apply even when a synthesis method other than the optimal synthesis method is used. Therefore, it can be applied to non-optimal combining reception such as diversity. Furthermore, using the inter-element correlation information in the antenna means and the reception information replaced as the transmission power of the new terminal has been transmission power controlled, the predicted signal-to-interference power ratio of the new terminal and all terminals in communication are used. By calculating the predicted signal-to-interference power ratio, it can be applied to a communication system that performs transmission power control.

Furthermore, in the code-space division multiple access system, by accommodating the new terminal when the predicted signal-to-interference power ratio of the new terminal can be secured at a predetermined level or more when the new terminal is accommodated. , CDMA method can be applied, and only the calculation of the predicted signal-to-interference power ratio of the new terminal needs to be performed, so that the calculation amount can be reduced. Furthermore, in the code-space division multiple access method, by accommodating the new terminal, when accommodating the new terminal, if the predicted signal-to-interference power ratio of all terminals in communication can be secured at a predetermined level or more, , CDMA systems can be combined and applied.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment) A channel allocation method according to the first embodiment of the present invention is a channel allocation method in an SDMA system having a time-division multiplexed communication slot, and is The channel of each terminal is set using the spatial domain. In this case, a plurality of spatially divided channels can be set in one communication slot. Further, since the channel allocation device according to the first exemplary embodiment of the present invention embodies the channel allocation method of the first exemplary embodiment of the present invention, the channel allocation device according to the first exemplary embodiment of the present invention is The channel allocation method according to the first embodiment of the present invention will be described by describing such a channel allocation device.

A channel allocation apparatus according to the first embodiment of the present invention will be described below with reference to FIGS. 1 to 8. FIG. 1 shows the configuration of a base station including the channel allocation device according to the first embodiment of the present invention as a channel allocation unit. The base station 1 shown in FIG. 1 includes a base station antenna 11 that is an adaptive array antenna, a channel management unit 12 that includes a communication state storage unit 14 that stores a channel state table, and a plurality of terminals that are in communication. The communication signal reception unit 13 includes a terminal signal separation unit 15 that separates the signals of 1 and a plurality of signal demodulation units 16 that demodulates the reception signals from each terminal separated by the terminal signal separation unit 15. Further, the base station 1 includes a control signal receiving unit 17 that receives a control signal such as a call signal of a new terminal,
A channel allocation unit 18 that allocates channels so that a predicted signal-to-interference power ratio can be sufficiently secured by referring to a channel status table or the like stored in the communication status storage unit 14;
A use channel notifying unit 19 for notifying the new terminal of the channel information allocated by the channel allocating unit 18 is provided.

The base station antenna 11 in the base station 1 is constructed as shown in FIG. 2, and the base station antenna 11 is an adaptive array antenna having _four antenna elements 11 ₁ , 11 ₂ , 11 ₃ and 11 _4. It is said that. The received signal of the base station antenna 11 is expressed as a signal vector U by the following equation. U = [a ₁ a ₂ a ₃ a ₄ ] ^T (5) where a ₁ , a ₂ , a ₃ and a ₄ are received by the respective antenna elements 11 ₁ , 11 ₂ , 11 ₃ and 11 _4. , And the subscript " ^T " represents the transposed matrix.

The base station 1 shown in FIG. 1 uses a plurality of terminals a by the SDMA method as in the example showing the communication state shown in FIG.
~ Communication with the terminal d is assumed. In this case, the channel format used for communication between the base station 1 and the terminals a to d is the format shown in FIG. In this channel format, a control slot 2 for transmitting a control signal, which is one slot, and a time-divided communication slot 3, which is the number of N slots (# 1 to #N), are used. That is, the terminals a to d during communication are
A channel is assigned to any one of the slots # 1 to #N for communication. Further, a calling signal transmitted when the new terminal requests communication is transmitted using the control slot 2. Further, the base station antenna 11, which is an adaptive array antenna, forms antenna beams B1 to B4 toward the terminals a to d that are communicating with the base station 1. This antenna beam B1
B4 is formed by controlling the weight of each element for each terminal in communication so that optimum combining can be performed among the antenna elements 11 ₁ , 11 ₂ , 11 ₃ , and 11 ₄ . That is, it is an adaptive array antenna based on the optimal combining method. This makes it possible to minimize the influence of the interference signals a to f coming from any direction.

When the communication state is as shown in FIG.
When the call signal from the new terminal is received by the base station 1,
To assign a new channel to a new terminal.
The channel allocation process is started. This channel assignment
Prior to processing, the current communication status
Parameter in the communication status storage unit 14
Is stored as Figure this channel state table
5, the channel state table is the terminal shown in FIG.
a to a plurality of terminals User1 to UserK that are in communication such as terminal d
Signal vector U in each communication slot # 1 to #N_n1，
U_n2・ ・ ・ U _nK(However, n = 1, 2, 3 ...
N) and each communication slot # in the base station antenna 11
Correlation matrix Φ between elements for each of 1 to #N₁, Φ₂・ ・ ・ Φ_NOr
It is composed of For multiple terminals in communication User1 to UserK
In each communication slot # 1 to #N where the channel is set
Signal vector U in_n1, U_n2・ ・ ・ U_nKCommunication
The unique known signals of multiple terminals User1 to UserK
Each antenna element 11₁, 11₂, 11₃, 11_FourAt
Output value of the matched filter
Is a vector element of the above equation (5),
Vector U_n1, U_n2・ ・ ・ U_nKHas been derived.

In each of the communication slots # 1 to #N
Antenna element 11₁~ 11_FourCorrelation matrix Φ between₁, Φ₂・ ・ ・
・ Φ_NAs for the above, the above equation (2) or equation (3)
Can be calculated by In addition, such calculation
The signal vector U is executed at every predetermined timing._n1, U_n2，
... U_nKAnd the correlation matrix Φ between elements₁, Φ₂・ ・ ・
Φ_NThe latest channel status table consisting of
It is stored in the storage unit 14. In addition, the channel status
The table is calculated regardless of the number of terminals in communication. example
For example, if the number of communicating terminals in communication slot #n is 0,
In this case, as shown in the equation (3), the correlation matrix Φ_nIs
Noise factor P_NThere is a terminal that is
If present, noise factor P_NTerminal signal U communicating with_NBy
And correlation matrix Φ _nWill be calculated.

Returning to FIG. 1, in the base station 1, the communication signal receiving section 13 receives the signals of the terminals a to d during communication by optimally combining signals (adaptive array) in the base station antenna 11. For example, the antenna elements 11 ₁ to
The correlation matrix for “interference signal + noise” between 11 ₄ is Φ,
When the signal vector of the desired terminal is given by U, the combined weight vector w for the desired signal is expressed by the following equation. w = Φ ⁻¹ U (6) Here, the subscript “ ⁻¹ ” represents an inverse matrix, and the composite weight vector w is a vector having the complex weights of the antenna elements 11 _{1 to} 11 ₄ as elements, and the correlation matrix Φ Is an inter-element correlation matrix for "interference signal + noise" that does not include the desired signal element.

Therefore, by using the signal vector and the correlation matrix in the channel state table shown in FIG. 5 stored in the communication state storage unit 14, it is possible to calculate the adaptive array combining weight vector for each of the terminals User1 to UserK. You can For example, channel # 1, terminal 1 (User
The combined weight vector w for 1) is given by the following equation. w = (Φ ₁ −U ₁₁ U ₁₁ ^H ) ⁻¹ U ₁₁ (7) Here, since the correlation matrix Φ ₁ stored in the communication state storage unit 14 also includes the correlation component regarding the desired signal,
As a correlation matrix with the desired signal component removed (Φ ₁ −U ₁₁ U
₁₁ ^H ) is used. Thus, in the base station 1, each terminal U
An optimum combined weight vector w is determined for ser1 to UserK, and signals from the respective terminals User1 to UserK are received.

Next, the channel allocation processing executed by the channel allocation unit 18 according to the first embodiment of the present invention will be described below with reference to the flowchart shown in FIG.
When a communication request is generated from a new terminal, the new terminal first transmits a control signal to the base station 1 using the control slot 2 to request communication. Upon receiving this control signal, the base station 1 starts the channel allocation process (step S1). As a result, the terminal ID is recognized from the control signal received in step S2. Next, the signal vector U _d is calculated from the control signal by the above equation (5) (step S3). Note that the signal vector U _d
As described above, the calculation is performed using the output value of the matched filter with respect to the known signal in the control signal.

Next, communication slot #n (n = 1, 2, ...
.., N), the predicted SINR γ _{n of the} new terminal is calculated (step S4). The predicted SINR γ _n of the new terminal for this communication slot #n is calculated by the following equation. γ _n = U _d ^H Φ _n ^-1 U _d (8) where U _d is the signal vector of the new terminal. When the predicted SINR γ _n for each communication slot is calculated by the above equation (8), this result is stored in the channel allocation unit 18. In the channel allocation unit 18, the calculated predicted SINR
γ _n is stored as the new terminal predicted SINR table shown in FIG. 7. From the new terminal predicted SINR table including the predicted SINRγ _{1 to} SINRγ _N of the new terminal in the communication slots # 1 to #N, the communication slots # 1 to
It is possible to obtain the predicted SINR value for a new terminal when the new terminal is accommodated in any of #N.

Therefore, the prediction SNR table for the new terminal stored in the channel allocation unit 18 is referred to, and the prediction S
The communication slots # 1 to #N are rearranged so that the priority increases in the order of increasing INRγ _n (step S5). This process is called determination of communication slot allocation priority. When the predicted SINRγ _n of the communication slot #n is the largest, the communication slot #n has the highest channel allocation priority. Also, the second predicted SINR
Communication slot #n ′ with the highest γ _n will have the second highest channel allocation priority. When the channel allocation priority is determined in this way, the communication slot #n having the highest priority is selected in step S6, and the predicted SINRγ _n of the new terminal in the communication slot #n is the SINRγ _req required for communication. It is determined whether the value is satisfied (step S7).

SINR required for communication in this determination
If the γ _req value is not satisfied, the process jumps to step S12, communication is disabled, the channel allocation process is terminated, and the call is treated as a call loss. If the SINR γ _{re q} value required for communication is satisfied in the above determination, the predicted SINR value of the terminal currently in communication is calculated (step S8). For example, the predicted SINR γ _nk of the terminal k in the communication slot #n is calculated by the following equation. γ _nk = U _nk ^H (Φ + U _d U _d ^H −U _nk U _nk ^H ) ⁻¹ U _nk (9) where U _nk is the signal vector of terminal k in communication slot #n and U _d is the new terminal. Is the signal vector of. The predicted SINRγ _nk for the terminal k (k = 1, 2, ..., K) in communication in the communication slot #n can be derived from the above equation (9). These results are stored in the channel allocating unit 18 as the predicted SINR table for the terminal during communication shown in FIG.

Next, the calculated prediction S of the terminal during communication is calculated.
INRγ_nkSINRγ required for communication with respect to the value_reqValue
It is determined whether or not it is larger than that (step S9). this
In the judgment, the predicted SINR γ of all communicating terminals_nk
SINRγ value required for communication _reqDetermined to be greater than the value
If so, communication slot #n is determined in step S10.
It is determined that a new terminal can be assigned to the. Also, step S9
In the determination of, the predicted SINRγ for the terminal in communication
_nkSINRγ required for communication_reqLess than
If it is determined that the communication slot #n
If it is impossible to allocate a new terminal, step
It branches to S11. Current priority in step S11
Whether or not the rank p reaches the last priority communication slot
Is determined, but currently p = 1 and set in step S6
Therefore, it is determined No and the process proceeds to step S13.
Mu. In step S13, the priority p is incremented by 1
And the next priority communication slot #n 'is set.
Then, the process returns to step S7.

Then, the communication slot of the next priority #
Steps S7 to S9 described above for n '
Processing is performed and predicted SINR γ of all terminals in communication
_{When it is} determined that the _nk value is larger than the SINRγ _req value required for communication, it is determined in step S10 that a new terminal can be assigned to the communication slot #n ′ having the priority. Also in this processing, if it is determined that there is one of the predicted SINRγ _nk values for the terminals in communication that is lower than the SINRγ _req required for communication, the communication slot #n ′ targeted for the processing is determined. It is determined that it is impossible to allocate a new terminal, and the communication slot of the next priority is set in step S12. in this way,
When it is continuously determined that it is impossible to allocate a new terminal to the communication slot that is the target of the process, the processes of steps S7 to S13 are repeated until the priority p reaches the last communication slot. Like If the new terminal allocation condition is not satisfied even when the priority order p reaches the last communication slot, the process proceeds from step S11 to step S12, and the channel allocation process is terminated because it is impossible to allocate the channel to the new terminal. And treat it as a call loss.

By executing such channel allocation processing, the SINRγ _req required for communication of the new terminal is secured, and at the same time the SINRγ _req required for communication is secured for the terminal in communication. Therefore, when the channel is assigned to the new terminal, the communication quality is always ensured even for the terminal in communication. Note that the channel assigned to the new terminal here is time-
It is a channel assigned to a new terminal in the spatial domain, and if SINRγ _req required for communication of a new terminal and communication of a terminal in communication can be secured, channels of a plurality of terminals can be assigned to one communication slot.

(Second Embodiment) Next, the second embodiment of the present invention will be described.
The channel allocation method according to the second embodiment of the present invention will be described below. Yes, it is possible to set a plurality of spatially and code-divided channels in the frequency band shared by all terminals. Further, the channel allocation device according to the second exemplary embodiment of the present invention is
Since the channel allocation method of the first embodiment of the present invention is embodied, the channel allocation device according to the second embodiment of the present invention will be described to explain the second embodiment of the present invention. A form of channel allocation method shall be described.

FIG. 9 shows the second embodiment of the present invention.
The description will be given using ~ 12. The configuration of the base station 1 including the channel allocation device according to the second embodiment of the present invention as the channel allocation unit 18 is the same as that of the first embodiment, and therefore its description is omitted. However, the channel format used for communication and the channel status table stored in the communication status storage unit 14 are different. These will be described below. FIG. 9 shows an outline of a CDMA channel format according to the second embodiment of the present invention.
Shown in. The CDMA channel format shown in FIG. 9 is
The horizontal axis represents time and the vertical axis represents the amount of data during communication. In the illustrated example, the control signal transmitted through the control signal channel and the channel of each terminal 1 to 3 that is in communication. User1 to User3 are shown.

In the CDMA system, different unique spreading codes are used for individual terminals in multiplexing. Since this spreading code is not completely orthogonal, each terminal receives a small amount of interference power from many other terminals. That is, terminal 1 (User1) to terminal 3 (User3) shown in FIG.
Interact with each other with slight interference. Also, TD
Unlike MA, there are no time slots and all signals are transmitted simultaneously. The control channel for transmitting the control signal may be set in the same frequency band as the frequency band in which the channel is set or may be set in a different frequency band. However, since the control signal has a signal level lower than that of all the other signals, it will not be a particular problem here.

Further, the base station 1 in the second embodiment
The channel status table stored in the communication status storage unit 14 is as shown in FIG. That is, CDMA
Since there is no communication slot in the channel state table for use, signal vectors U ₁ , U _2, ... For terminal 1 (User1), terminal 2 (User2) ... Terminal K (UserK) are shown in FIG. It is composed of U _K and the inter-element correlation matrix Φ in the channel for CDMA. Further, in the base station 1, the communication signal receiving unit 13 receives the signal of the terminal in communication using the optimum signal combination (adaptive array) among the plurality of antenna elements 11 _{1 to} 11 ₄ in the base station antenna 11. . The inter-element correlation matrix is Φ,
When the signal vector of the terminal k is given by U _k , the combined weight vector w for the desired signal is expressed by the following equation. w = (Φ−U _k U _k ^H ) ⁻¹ U _k (10) Therefore, FIG. 10 stored in the communication state storage unit 14 is used.
Signal vector U _k in the channel state table shown in
By using the correlation matrix Φ and, the adaptive array combining weight vector can be calculated for each terminal.

Next, the channel allocation processing executed in the channel allocation unit 18 according to the second embodiment of the present invention will be described with reference to the flowchart shown in FIG. When the base station 1 receives the control signal transmitted from the new terminal by the specific spreading code assigned for the control channel (step S20),
The channel allocation process is activated. As a result, from the control signal received in step S21, I
D is recognized, and then, in step S22, the signal vector U _d is calculated from the control signal by the equation (5). When calculating the signal vector U _d ,
The calculation is performed using the output value of the matched filter for the known signal in the control signal. Furthermore, in the base station 1, the predicted SINR γ _d of the new terminal and the predicted SINR of the terminal in communication
γ _k (where k = 1, 2, ... K) is calculated (step S23). Note that the predicted SINRγ of the new terminal
_d is calculated by the following formula. γ _d = G × (U _d ^H Φ ⁻¹ U _d ) (11) where G is a spreading gain in CDMA.

Also, the predicted SINRγ of the terminal during communication_kIs
It is given by the following formula.   γ_k= G × {U_k ^H(Φ + U_dU_d ^H-U_kU_k ^H)^-1U_k} (12) Where U_kIs the signal vector of the communicating terminal (terminal k)
And k = 1, 2, ... K. like this
And the predicted SINR γ for each terminal in communication _kCalculate
When output, this result is the new value calculated by equation (11).
Predicted SINRγ of terminal_dTogether with the CDMA shown in FIG.
SINR table for new terminals and terminals in communication
Stored in. In addition, prediction for new terminals and terminals in communication
The SINR table is stored in the channel allocation unit 18.
There is. Thus, the prediction S for new terminals and terminals in communication
Accommodates a new terminal by referring to the INR table
SINRγ of new terminal when_dValue and end of communication
End predicted SINRγ_kCan be obtained.

Then, in determining whether or not the new terminal can be accommodated in step S24, it is determined whether or not the calculated predicted SINRγ _d value of the new terminal satisfies the SINR _req necessary for communication, and whether the terminal in communication is in use. Predicted SINR γ
A determination is made as to whether _k satisfies the SINR _req required for communication. Here, the predicted SIN of the new terminal
The Rγ _d value satisfies the SINR _req value required for communication, and the terminal 1 (User1), the terminal 2 (User2), ... Terminal K
If the predicted SINRγ _k of all (UserK) terminals in communication satisfies the SINR _req value required for communication, the process proceeds to step S25, and a new terminal is accommodated. In this case, a unique spreading code for communication that is not used is assigned from the utilization channel notifying unit 19 of the base station 1. If No is determined in step S24, the predicted SINRγ _d value of the new terminal does not satisfy the SINR _req value required for communication, or the predicted SINR γ _k of at least some of the communicating terminals is necessary for communication. SI
Since the NR _req value is not satisfied, step S2
In step 6, the new terminal cannot be accommodated, the channel allocation processing is terminated, and the call is treated as a call loss.

As described above, in the second embodiment of the present invention, when the SDMA method is applied to the CDMA method, it is necessary for the predicted SINRγ _{d of the} new terminal and the predicted SINR γ _k of the terminal in communication. By setting the SINRγ _req condition, it is possible to decide whether or not to accommodate a new terminal while maintaining the communication quality of the terminal during communication at a predetermined level or higher.

(Third Embodiment) Third Embodiment of the Present Invention
A channel allocation method and apparatus in the form of
In the SDMA system having an open communication slot
The optimal combining method is the signal combining method between the antennas of the active array.
Channel allocation method and device
It is placed. In the first embodiment of the present invention described above
In such a channel allocation method and apparatus, the base station antenna
The adaptive array antenna which is the antenna 11 is an antenna
Element 11 ₁~ 11_FourWhen the optimal synthesis method is performed between
Was used as the channel allocation device. However, Ada
The adaptive array antenna is not limited to the optimal combining method, but the maximum ratio
Adaptive using synthesis methods such as synthesis method and equal gain synthesis method
Array antennas are also known, and such a synthesis method is adopted.
When used, the channel allocation according to the first embodiment
This method and channel allocation device can not be adopted
won.

The above-mentioned problem can be solved by the channel allocating method and apparatus according to the third embodiment of the present invention. The synthesizing method other than the optimal synthesizing method is used as the signal synthesizing method between the antennas of the adaptive array antenna. For example, a combining method such as a maximum ratio combining method or an equal gain combining method can be used. The channel allocation method and apparatus according to the third embodiment of the present invention can be applied even when there is a weight control error in the adaptive array. Hereinafter, the channel allocation method according to the third embodiment of the present invention will be described to explain the channel allocation method according to the third embodiment of the present invention. The configuration of the base station 1 including the channel allocation device according to the third embodiment of the present invention as the channel allocation unit 18 is the same as that of the first embodiment, and therefore its description is omitted. However, the method of calculating the predicted SINR of a new terminal and the predicted SINR of a terminal in communication differs from that of the first embodiment. Accordingly, the new terminal prediction S stored in the channel allocation unit 18
A difference also occurs in the configurations of the INR table and the predicted SINR table for the terminal during communication.

The flowchart of the channel allocation processing executed in the channel allocation unit 18 of the base station 1 according to the third embodiment of the present invention is the same as the flowchart of the first embodiment shown in FIG. It That is,
Channel allocation is performed by the same channel allocation processing as the flowchart shown in FIG. However, since the synthesizing method is not limited to the optimal synthesizing method and the method of calculating the predicted SINR of a new terminal and the method of calculating the predicted SINR of a terminal in communication are different, the calculation methods in step S4 and step S8 are different. . less than,
Predicted SI of a new terminal according to the third embodiment of the present invention
A method of calculating the NR and the predicted SINR of the terminal during communication will be described with reference to the flowchart shown in FIG.

As described above, when the signal vector U _d of the new terminal is calculated in step S3 in the flowchart of the channel allocation process shown in FIG. 6, communication slot #n
Predicted SINR γ _n for (n = 1, 2, ..., N)
Is calculated in step S4. At this time, in the third embodiment of the present invention, the predicted weight vector w _n of the new terminal when the new terminal is accommodated in the communication slot #n
Is calculated. Usually, the prediction weight vector w _n of the new terminal is determined by the signal vector U _d of the new terminal, the inter-element correlation matrix Φ, and the combining method thereof. For example, in the case of the maximum ratio combining method, the prediction weight vector w _n for the communication slot #n is given by the following equation. W _n = Φ ′ ⁻¹ · U _d (13) Here, since it is the maximum ratio combining method, Φ ′ takes out only the diagonal components of the correlation matrix Φ, and the other components are 0.
It is said to be a matrix. In this way, the prediction weight vector w _n can usually be derived from the new signal vector U _d and the correlation matrix Φ, and the communication slot #n (n = 1, n = 1,
2 ,. ． ． , N), the prediction weight vector w _n is calculated in step S4.

The result of this calculation is the channel allocation unit 18
The predicted SINR for the new terminal shown in FIG.
Stored in a table. Further, using the calculated prediction weight vector w _n , the predicted SINR γ _{n of the} new terminal is represented by the following equation. γ _n = w _n ^H (U _d U _d ^H ) w _n / w _n ^H Φ _n w _n (14) Using this equation (14), the predicted SINR γ _n for each communication slot #n is calculated in step S4. Calculation is performed, and the calculation result is the predicted SIN for the new terminal shown in FIG.
It is stored in the R table. In addition, step S shown in FIG.
5, the predicted SINR γ _n of the new terminal in the predicted SINR table for the new terminal shown in FIG.
A process of rearranging the communication slots # 1 to #N is performed such that the priority increases in the order of increasing γ _n .

Further, during communication performed in step S8
Predicted SINRγ of terminal_nkIs calculated as follows.
Predicted SINRγ of the terminal in communication in communication slot #n_nk
When calculating
Vector w_nkCalculate (k = 1, 2, ..., K)
It In the calculation, the signal vector U of the terminal in communication
_nkAnd the correlation matrix Φ_nUsing the prediction weight vector w_nkTo
decide. For example, in the case of the maximum ratio combining method, the above (1
It is calculated using the formula 3). In addition, in the case of other synthesis methods,
It is calculated by a calculation formula based on the synthesis method of. Determined
Measurement weight vector w_nkThe value is stored in the channel allocation unit 18.
The predicted SINR test for the terminal during communication shown in FIG.
Stored in a table.

Using the prediction weight vector w _nk thus calculated, the terminal k (k = 1, 1) in communication.
2 ,. ． ． , K) predicted SINRγ _nk is given by the following equation. γ _nk = w _nk ^H (U _nk U _nk ^H ) w _nk / w _nk ^H (Φ + U _d U _d ^H −U _nk U _nk ^H ) w _nk (15) In communication slot #n using the above equation (15) SINRγ _nk of the terminal k (k = 1, 2, ..., K) during communication of
Is calculated in step S8. The calculated predicted SINR γ _nk of the terminal in communication is stored in the predicted SINR table for terminal in communication shown in FIG. Furthermore, step S9 shown in FIG.
Then, the predicted SINR stored in the predicted SINR table for the terminal in communication as the predicted SINR γ _nk of the terminal in communication
The γ _nk value is used to determine whether or not the predicted SINR value of the terminal during communication is larger than the SINR γ _req value required for communication. Then, based on this determination result, whether or not to allocate a communication slot to a new terminal is performed as described above. As described above, the channel allocation apparatus according to the third embodiment of the present invention can perform channel allocation for a new terminal not only by the optimal combining method but also by various combining methods. Furthermore, when channel allocation is performed for a new terminal, it is possible to always achieve the communication quality for the terminal in communication.

(Fourth Embodiment) A channel allocation method and apparatus according to the fourth embodiment of the present invention is such that, when the SDMA method is applied to the CDMA method, the adaptive array of the adaptive array is changed by a combining method other than the optimum combining method. The channel allocation method and device are used when signals are combined between antennas. A channel allocation method and apparatus according to a fourth embodiment of the present invention is a combination method other than the optimum combination method as a signal combination method between antennas of an adaptive array antenna, for example, a combination method such as a maximum ratio combination method or an equal gain combination method. Can be used. The channel assignment method and apparatus according to the fourth embodiment of the present invention can be applied even when there is a weight control error in the adaptive array. Less than,
A channel allocation method according to the fourth embodiment of the present invention will be described by describing a channel allocation device according to the fourth embodiment of the present invention.

A base station 1 including a channel allocation device according to a fourth embodiment of the present invention as a channel allocation unit 18.
Since the configuration of is similar to that of the second embodiment, its description is omitted. However, the method of calculating the predicted SINR of a new terminal and the predicted SINR of a terminal during communication is different from that of the second embodiment. Along with that, the prediction S for the new terminal and the terminal during communication stored in the channel allocation unit 18
A difference will also occur in the structure of the INR table. Further, the flowchart of the channel allocation processing executed in the channel allocation unit 18 of the base station 1 according to the fourth embodiment of the present invention is the same as the flowchart of the second embodiment shown in FIG. That is, channel allocation is performed by the same channel allocation processing as the flowchart shown in FIG. However, since the synthesizing method is not limited to the optimal synthesizing method and the method of calculating the predicted SINR of a new terminal and the method of calculating the predicted SINR of a terminal in communication are different, the calculation method in step S23 is different. A method of calculating the predicted SINR of a new terminal and the predicted SINR of a terminal in communication in the fourth embodiment of the present invention will be described below with reference to the flowchart shown in FIG.

As described above, in the flowchart shown in FIG. 11, the signal vector U _d of the new terminal is determined by step S
When calculated in step 22, the predicted SINR of the new terminal and the predicted SINR of the terminal in communication are calculated in step S23. At this time, in the fourth embodiment of the present invention, the predicted weight vector w _d of the new terminal and the predicted weight vector w _k of the terminal in communication are first calculated.
Normally, the prediction weight vector w _d of the new terminal is determined by the signal vector U _d of the new terminal, the inter-element correlation matrix Φ, and the combining method thereof. Similarly, the predicted weight vector w _k of the terminal in communication is determined by the signal vector U _k of the terminal in communication, the inter-element correlation matrix Φ, and the combining method thereof. For example, in the case of the maximum ratio combining method, the prediction weight vector w _d and the prediction weight vector w _k can be calculated by using the equation (13).

Then, the calculated result is stored in the predicted SINR table for the new terminal and the terminal in communication shown in FIG. Further, using the calculated prediction weight vector w _d of the new terminal, the predicted SINR γ _{d of the} new terminal is expressed by the following equation. γ _d = G × w _d ^H (U _d U _d ^H ) w _d / w _d ^H Φw _d (16) Also, the predicted SINR γ _k of the terminal k (k = 1, 2, ..., K) in communication. Is given by γ _k = G × w _k ^H (U _k U _k ^H ) w _k / w _k ^H (Φ + U _d U _d ^H −U _k U _k ^H ) w _k (17) Here, G is a spreading gain. The predicted SINR γ _{d of the} new terminal calculated in this way and the terminal k in communication
The predicted SINR γ _k of (k = 1, 2, ..., K) is stored in the predicted SINR table for new terminals and terminals in communication shown in FIG. Then, step S shown in FIG.
24, the predicted SINR γ _d of the new terminal in the predicted SINR table for the new terminal and the terminal during communication shown in FIG.
And it is determined whether or not the predicted SINRγ _k of the terminal k (k = 1, 2, ..., K) in communication satisfies the SINR _req required for communication. Then, based on this determination result, whether or not to accommodate a new terminal is performed as described above,
When accommodating, a unique spreading code is assigned to the new terminal. As described above, the channel allocation device according to the fourth embodiment of the present invention can perform channel allocation for a new terminal not only in the case of optimal combining but also under various combining methods. Further, it becomes possible to determine whether or not a new terminal can be accommodated while maintaining the communication quality of the terminal during communication at a predetermined level or higher.

(Fifth Embodiment) In a channel assignment method and apparatus according to a fifth embodiment of the present invention, transmission power control is performed on the terminal side in the SDMA system having a time division multiplexed communication slot. In this case, the channel allocation method and device are used. In the SDMA method, many terminals access the base station 1 at the same time and cause slight interference with each other. Therefore, it is preferable that signals from each terminal arrive at the base station 1 with the same power. By performing such transmission power control on the terminal side, it is possible to treat the signal qualities of the signals from each terminal that reach the base station 1 equally. The channel allocating method and apparatus according to the fifth embodiment of the present invention perform channel allocating processing capable of ensuring sufficient communication quality in a new terminal and a terminal in communication even if transmission power control is performed on the terminal side. Is something that can be done. The configuration of the base station 1 is as shown in FIG.

Channel allocation according to the fifth embodiment of the present invention
In the method and apparatus, the terminal side controls the transmission power during communication.
Channel allocation is performed on the assumption that this will happen.
That is, the signal vector U of the new terminal_dTo calculate
Therefore, it is received from the received control signal during transmission power control.
The predicted signal level and the predicted signal vector
U _d'Is used to perform the channel allocation processing. Since
To explain in detail below, the signal vector calculated from the control signal.
Cutle U_dFrom the predicted signal vector U using_d’
calculate.   U_d’= {P₀ ^1/2/ (U_d ^HU_d)^1/2} U_d                      (18) This equation (18) is the prediction signal vector U_d’Always power
P₀And reaches the base station 1 by transmission power control.
The incoming signal power is always P₀It is assumed that

Then, the predicted signal vector U _d 'calculated by the above equation (18) is replaced with the signal vector U _d , and the above equation (8) is calculated to calculate the predicted SINRγ _n in each communication slot of the new terminal. calculate. The predicted SINR γ _{n of the} calculated new terminal (where n = 1, 2, ...
..N) is stored in the new terminal predicted SINR table shown in FIG. In addition, the prediction signal vector U _d 'calculated by the above equation (18) is replaced with the signal vector U _d , and the above equation (9) is calculated to obtain the prediction S of the terminal during communication.
INRγ _nk (where k = 1, 2, ... K) is calculated. The predicted SINR γ _nk of the calculated terminal during communication is shown in FIG.
It is stored in the predicted SINR table for the terminal during communication shown in FIG. Subsequent channel allocation processing proceeds according to the flowchart of FIG. As a result, in the channel allocation method and apparatus according to the fifth embodiment of the present invention, even if the new terminal performs transmission power control, the channel is allocated to the new terminal when the channel is allocated to the new terminal. Securing communication quality will always be achieved.

(Sixth Embodiment) The channel assignment method and apparatus according to the sixth embodiment of the present invention are applied when the transmission power control is performed on the terminal side when the SDMA method is applied to the CDMA method. A channel allocation method and apparatus. At this time, the configuration of the base station 1 is as shown in FIG. In the channel allocation method and apparatus of the sixth embodiment of the present invention, the signal vector U _{d of the} new terminal is
In calculating, the signal level received during transmission power control is predicted from the received control signal, and the predicted signal vector U _d 'is used to perform channel allocation processing. Described in detail below, the predicted signal vector U _d ′ is calculated from the signal vector U _d calculated from the control signal using the following equation. U _d '= {P ₀ ^1/2 / (U _d ^H U _d ) ^1/2 } U _d (19) In this equation (19), the prediction signal vector U _d ' has always the power P _0. It is assumed that the signal power arriving at the base station 1 is always P ₀ due to the transmission power control.

Then, the prediction signal vector U _d 'calculated by the above equation (19) is replaced with the signal vector U _d , and the above (1
The predicted SINR of the new terminal is calculated by calculating equation (1).
Calculate γ _d . Predicted SINR γ _{d of the} calculated new terminal
Is the predicted SI for the new terminal and the terminal in communication shown in FIG.
It is stored in the NR table. Also, the predicted signal vector U _d 'calculated by the above equation (19) is replaced with the signal vector U _d , and the above equation (12) is calculated to calculate the predicted SINR γ _k (where k = 1 , 2, ...
K) is calculated. Predicted SIN of the calculated terminal in communication
Rγ _k is stored in the predicted SINR table for new terminals and terminals in communication shown in FIG. Subsequent channel allocation processing proceeds according to the flowchart of FIG. As a result, in the channel allocation method and apparatus of the sixth exemplary embodiment of the present invention, even when a new terminal performs transmission power control when the SCDMA method is applied to the CDMA method, the communication quality of the terminal being in communication is predetermined. It becomes possible to decide whether to accommodate a new terminal while maintaining the level or higher.

(Seventh Embodiment) The channel assignment apparatus of the present invention can also be applied to a communication system in an indoor environment as shown in FIG. In this communication system,
As shown in FIG. 19, a plurality of indoor antennas 110a to 110f are provided on the wall or ceiling of the room 100. These indoor antennas 110a to 110f are used for the central control station 11
Connected to 1. In addition, inside the room 100, a plurality of terminals 112a to 112c are in communication. The central control station 111 is provided with the channel allocation device according to the present invention, and when a new terminal requests the central control station 111 for communication, based on the signal vector received by the plurality of indoor antennas 110a to 110f. Te, as SINRganma _req necessary for communication with respect to terminal in communication at the same time SINRganma _req required for communication of the new terminal is secured is secured, above the channel assignment process is performed.

As described above, the channel allocation method and apparatus according to the seventh embodiment of the present invention depends on the antenna spacing, unlike the above-described first to sixth embodiments of the present invention. The channel allocation method and apparatus can be applied to any antenna interval without performing the above. In the first to sixth embodiments of the present invention, the adaptive array antenna,
It is considered to be a communication system when the antenna spacing such as a diversity antenna is about several wavelengths. As described above, the channel allocation method and apparatus according to the seventh embodiment of the present invention is an environment in which a plurality of indoor antennas 110a to 110f are set on a wall or a ceiling in an indoor environment as shown in FIG. Can also be applied to. That is, the channel allocation method and apparatus according to the seventh embodiment of the present invention can be applied to a case where outputs from a plurality of antennas are combined in an environment in which a plurality of antennas surround a terminal. As described above, the channel allocation method and apparatus according to the seventh embodiment of the present invention can be applied to a distributed antenna system having a sufficiently wide antenna interval.

(Eighth Embodiment) A channel allocation method according to an eighth embodiment of the present invention is a channel allocation method in the SDMA system having time-division-multiplexed communication slots. The channel allocation method is capable of accommodating the above channels and simultaneously creating communication slots with a low utilization state. The configuration of the base station 1 including the channel allocation device according to the eighth embodiment of the present invention, which embodies the channel allocation method according to the eighth embodiment of the present invention, as the channel allocation unit 18 is the same as that of the first embodiment. Since it is the same as that of No. 1, the description thereof will be omitted. However, the channel allocation processing executed by the channel allocation unit 18 is different from that of the first embodiment. Therefore, the channel allocation processing executed by the channel allocation unit 18 according to the eighth embodiment of the present invention will be described below with reference to the flowchart shown in FIG.

When a communication request is made from a new terminal,
First, the new terminal uses the control slot 2 to the base station 1 to transmit a control signal to the effect that communication is desired. Base station 1
In, when the control signal is received, the channel allocation processing is started (step S31). As a result, the terminal ID is recognized from the control signal received in step S32. Next, the signal vector U _d is calculated from the control signal by the above equation (5) (step S33). As described above, the signal vector U _d is calculated by using the output value of the matched filter for the known signal in the control signal.

Next, communication slot #n (n = 1, 2, ...
.., N), the predicted SINR γ _{n of the} new terminal is calculated (step S34). The predicted SINR γ _n of the new terminal for this communication slot #n is calculated by the above equation (8). When the predicted SINR γ _n for each communication slot is calculated by the above equation (8), this result is stored in the channel allocation unit 18. The channel allocation unit 18 stores the calculated predicted SINR γ _n as the new terminal predicted SINR table shown in FIG. 7. Predicted SINR γ _{1 to} S of the new terminal in the communication slots # 1 to #N
A predicted SINR value for a new terminal when the new terminal is accommodated in any of the communication slots # 1 to #N can be obtained from the predicted SINR table for new terminal composed of INRγ _N.

Therefore, the prediction SINR table for new terminals stored in the channel allocation unit 18 is referred to, and the prediction S
The communication slots # 1 to #N are rearranged so that the priority becomes higher in ascending order of INRγ _n (step S35). This process is called determination of communication slot allocation priority. When the predicted SINR γ _n of the communication slot #n is the smallest, the communication slot #n has the highest channel allocation priority. Also, the second predicted SINR
The communication slot #n ′ having a smaller γ _n will have the second highest channel allocation priority. When the channel allocation priority is determined in this way, the communication slot #n having the highest priority (p = 1) is selected in step S36, and the prediction S of the new terminal in the communication slot #n is selected.
It is determined whether INRγ _n satisfies the SINRγ _req value required for communication (step S37).

SINR required for communication in this determination
If the γ _req value is not satisfied, the process jumps to step S43, the priority is incremented by 1 and the communication slot #n 'having the next priority (p = 2) is selected, and the communication slot #n is selected. Prediction S of new terminals in '
It is determined whether INRγ _n 'has the SINRγ _req value required for communication (step S37). This step S
The process of 43 and step S37 is repeatedly performed until the predicted SINRγ _n of the new terminal in the selected communication slot satisfies the SINRγ _req value required for communication. Then, in step S37, the SINRγ required for communication is
_When it is determined that the _req value is satisfied, the predicted SINR value of the terminal currently in communication is calculated by the above equation (9) (step S38). According to the above equation (9), the terminal k in communication in the communication slot #n (where k = 1,
2 ,. ． ． , K) can be derived for each predicted SINR γ _nk . These results are obtained by the channel allocation unit 1
8 is stored as the predicted SINR table for the terminal during communication shown in FIG.

Next, the calculated prediction S of the terminal during communication
It is determined whether the INRγ _nk value is larger than the SINRγ _req value required for communication (step S39). In this determination, the predicted SINR γ of all communicating terminals
If it is determined that the _nk value is larger than the SINRγ _req value required for communication, the communication slot #
It is determined that a new terminal can be assigned to n. Also, step S
In the judgment of 39, the predicted SIN for the terminal in communication
If it is determined that some of the Rγ _nk values are below the SINRγ _req required for communication, it is determined that it is impossible to allocate a new terminal to the communication slot #n, and the process branches to step S41. In step S41, it is determined whether or not the current priority level p has reached the last priority (p = N) communication slot. If p = N has not been reached, the process proceeds to step S43. In step S43, the priority p is incremented by 1 as described above, the communication slot of the next priority is set, and the process returns to step S37.

Then, the processes of steps S37 to S39 are performed for the next priority communication slot. This step S37 to step S3
The process of 9 is repeated by incrementing the priority by 1 until it is determined that the predicted SINRγ _nk values of all terminals in communication are larger than the SINRγ _{re q} value required for communication. Even if the above-described processing is repeatedly performed until the priority p reaches the last communication slot N, if the new terminal allocation condition is not satisfied, the process proceeds from step S41 to step S42, and it is not possible to allocate the channel to the new terminal. If possible, the channel allocation process is terminated and treated as a call loss.

As described above, in the eighth embodiment of the present invention, the predicted SINR for the new terminal is referred to by referring to the predicted SINR table for the new terminal.
The priority is set to increase in ascending order of γ _n , and it is determined whether or not the communication slots satisfy the new terminal allocation condition in the order of priority. As a result, many channels can be accommodated in one communication slot, and a communication slot with a low utilization state can be created. As described above, in the eighth embodiment of the present invention, it is possible to make unused communication slots easy to use in other base stations and the like by providing different usage states depending on the communication slots. In the channel allocating method and apparatus according to the eighth embodiment of the present invention, the signal combining method between the antennas of the adaptive array in the SDMA method having the time division multiplexed communication slots is
A synthesis method other than the optimum synthesis method may be used.

Further, in the channel allocation method and apparatus according to the eighth embodiment of the present invention, in the SDMA system having the time-division-multiplexed communication slots as in the above-mentioned fifth embodiment of the present invention. Transmission power control may be performed on the terminal side. Furthermore, the channel allocating apparatus according to the eighth embodiment of the present invention can be applied to the indoor communication system as shown in FIG.

(Ninth Embodiment) A channel allocation method according to a ninth embodiment of the present invention is a channel allocation method in an SDMA system having communication slots time-division-multiplexed, which reduces the amount of calculation. Is a possible channel allocation method. The configuration of the base station 1 including the channel allocation device according to the ninth embodiment of the present invention, which embodies the channel allocation method according to the ninth embodiment of the present invention, as the channel allocation unit 18 is the same as that of the first embodiment. Since it is the same as that of No. 1, the description thereof will be omitted. However, the channel allocation processing executed by the channel allocation unit 18 is different from that of the first embodiment. Therefore, the channel allocation processing executed by the channel allocation unit 18 according to the ninth embodiment of the present invention will be described below with reference to the flowchart shown in FIG.

When communication is requested from a new terminal,
First, the new terminal uses the control slot 2 to the base station 1 to transmit a control signal to the effect that communication is desired. Base station 1
In, when the control signal is received, the channel allocation processing is started (step S51). As a result, the terminal ID is recognized from the control signal received in step S52. Next, the signal vector U _d is calculated from the control signal according to the equation (5) (step S53). As described above, the signal vector U _d is calculated by using the output value of the matched filter for the known signal in the control signal.

Next, the priority of the communication slots # 1 to #N is randomly determined (step S54). At this time, the base station 1 prepares a uniform random number of 0 to 1 corresponding to each communication slot, and determines the priority order in the descending order of the random numbers. Set. When the channel allocation priorities of the communication slots are determined in this way, step S55
The communication slot #n having the highest priority (p = 1) is selected in step S56, and the predicted SINRγ _{n of the} new terminal and the predicted SINR γ _{n k} of the terminal in communication are selected for the communication slot #n in step S56. calculate. The predicted SINR γ _n of the new terminal for this communication slot #n is calculated by the above equation (8), and the predicted SINR γ _nk of the terminal in communication is calculated by the above equation (9).

Next, the predicted SINRγ _n of the new terminal in the communication slot #n is the SINRγ _req required for communication.
It is determined whether or not the value is satisfied and the calculated predicted SINRγ _nk of the terminal in communication in the communication slot #n satisfies the SINRγ _req value required for communication (step S57). Here, communication slot #n
If it is determined that the predicted SINRγ _n of the new terminal and the predicted SINR γ _{n k} of the terminal currently communicating with each other both satisfy the SINRγ _req value required for communication, it is determined that the new terminal can be assigned to the communication slot #n. Step S58
At, a new terminal is assigned to communication slot #n. Also, the predicted SINR of the new terminal in communication slot #n
If it is determined that γ _n or the predicted SINR γ _nk of the terminal in communication does not satisfy the SINR γ _req value required for communication, it is determined that a new terminal cannot be assigned to the communication slot #n, and the step It branches to S59.
In this step S59, it is determined whether or not the current priority level p has reached the last priority (p = N) communication slot. If it has not reached p = N, the process proceeds to step S61. In step S61, the priority order p is 1 as described above.
Is incremented by 1 to set the next priority communication slot, and the process returns to step S56.

Then, the processes of steps S56 and S57 are performed for the next priority communication slot. This step S56 and step S5
In the process of 7, the predicted SINR γ _n of the new terminal and the predicted SINR γ _nk of the terminal in communication in the communication slot of the priority set in step S61 are the SIN required for communication.
The priority is incremented by 1 and repeated until both Rγ _req values are determined to be satisfied.
Here, if the above-mentioned new terminal allocation condition is not satisfied even if the above-described processing is repeatedly performed until the priority p reaches the last communication slot N, the process proceeds from step S59 to step S60, and the channel is transmitted to the new terminal. Since it is impossible to allocate the channel, the channel allocation processing is terminated, and it is treated as a call loss.

As described above, in the ninth embodiment of the present invention, the priority order of the communication slots # 1 to #N is randomly determined, and a new terminal is set in the communication slot of this random priority order. SINRγ _n and the predicted SINRγ _nk of the terminal during communication are SINRγ required for communication
_It is determined whether or not both _req values are satisfied. This eliminates the need to calculate the predicted SINRγ _n of the new terminal in all communication slots # 1 to #N when it is assumed that the new terminal is accommodated. That is,
Since the predicted SINR γ _{n of the} new terminal has to be performed only for the communication slots required after the priority order is determined, the calculation amount can be reduced. In the channel allocation method and apparatus according to the ninth embodiment of the present invention, a signal combining method between antennas of an adaptive array in the SDMA method having a time division multiplexed communication slot is
A synthesis method other than the optimum synthesis method may be used.

Furthermore, in the channel allocating method and apparatus according to the ninth embodiment of the present invention, in the SDMA method having the time-division multiplexed communication slots as in the above-mentioned fifth embodiment of the present invention. Transmission power control may be performed on the terminal side. Furthermore, the channel allocation device according to the ninth embodiment of the present invention can be applied to the communication system in the indoor environment as shown in FIG.

(Tenth Embodiment) The tenth embodiment of the present invention is a channel allocation method and apparatus in the SDMA method having time-division multiplexed communication slots, which is required for a new terminal in the channel allocation processing. SIN
When R is the first required SINRγ _req and the SINR required for the terminal in communication is the second required SINRγ _req ,
The channel allocation method and device are adapted to smoothly accommodate new terminals by setting the first required SINRγ _{r eq} and the second required SINRγ _req to different values. In the above description of the first, third, fifth, seventh, eighth and ninth embodiments, the channel allocation processing in the SDMA method having the time division multiplexed communication slots (see FIGS. 6 and 2).
0, 21), the first required SINR γ _req for the new terminal and the second required SI for the communicating terminal.
The description has been made assuming that NRγ _req is the same value. However, different values may be used for the first required SINRγ _req for the new terminal and the second required SINRγ _req for the terminal in communication.

Here, a case will be described in which the value of the second required SINRγ _req for the terminal in communication is smaller than the first required SINRγ _req for the new terminal. In this case, the predicted SINR γ _n of the new terminal becomes _equal to or larger than the first required SINR γ _req, and the predicted SINR γ _n of each terminal in communication.
A communication slot having NRγ _nk equal to or larger than the second required SINRγ _req will be assigned to the new terminal. Normally, the terminal assigned to the communication slot starts communication under the SINR of the first required SINR γ _req or more at the beginning of communication. However, when newer terminals are accommodated in the same slot, the SINR value is expected to decrease as the number of accommodated terminals increases.

Thus, the predicted SINR of the terminal during communication
In many cases, the value gradually decreases compared to when communication is started. Assuming such a situation, by setting the second required SINRγ _req required for each communicating terminal to be smaller than the first required SINRγ _req required for the new terminal in advance, accommodation of the new terminal can be made smoother. It is possible to proceed to. The configuration of the base station 1 including the channel allocation device that executes the channel allocation processing according to the tenth embodiment of the present invention described above as the channel allocation unit 18 is similar to that of the first embodiment, and therefore the description thereof will be omitted. Omit it. In addition,
In the channel allocating method and apparatus according to the tenth embodiment of the present invention, the signal combining method between the antennas of the adaptive array in the SDMA method having the time division multiplexed communication slots is a combining method other than the optimum combining method. May be.

Furthermore, in the channel allocating method and apparatus according to the tenth embodiment of the present invention, in the SDMA system having the time-division multiplexed communication slots as in the above-mentioned fifth embodiment of the present invention. Transmission power control may be performed on the terminal side. Furthermore, the channel allocation device according to the tenth embodiment of the present invention can be applied to a communication system having an indoor environment as shown in FIG.

(Eleventh Embodiment) The eleventh embodiment of the present invention is a channel allocation method and apparatus when the SDMA system is applied to the CDMA system, and predicts terminals in communication in the channel allocation process. The channel allocation method and apparatus are designed to reduce the calculation load on the base station 1 by only calculating the predicted SINRγ _d of the new terminal without calculating the SINRγ _n . The configuration of the base station 1 including the channel allocation device according to the eleventh embodiment of the present invention as the channel allocation unit 18 is the same as that of the second embodiment, and therefore its description is omitted. However, the channel allocation processing method is different from that of the second embodiment.

Channel allocation processing in the eleventh embodiment of the present invention will be described with reference to the flowchart shown in FIG. When the base station 1 receives the control signal transmitted from the new terminal by the specific spreading code assigned for the control channel (step S
70), the channel allocation process is started. This allows
The ID of the new terminal is recognized from the control signal received in step S71, and then the signal vector U _d is calculated from the control signal in step S72. Furthermore, the base station 1 calculates the predicted SINR γ _d of the new terminal (step S73). Note that the signal vector U
_For the calculation of _d and the prediction SINRγ _d of the new terminal, the same method as the above-described calculation method in the second embodiment of the present invention is used.

Next, in step S74, in determining whether to accommodate the new terminal, it is determined whether the calculated predicted SINRγ _d value of the new terminal satisfies the SINR _req required for communication. Here, if the predicted SINRγ _d value of the new terminal satisfies the SINR _req value required for communication, the process proceeds to step S75, and the new terminal is accommodated. In this case, the unique spreading code for communication that is not used by the utilization channel notifying unit 19 of the base station 1 will be assigned to the new terminal. If No is determined in step S74,
The predicted SINR γ _d value of the new terminal is the SINR required for communication
_{Since the req} value is not satisfied, the new terminal cannot be accommodated in step S76, the channel allocation processing is terminated, and the call is treated as a call loss.

As described above, in the eleventh embodiment of the present invention, only the predicted SINR γ _d of the new terminal is calculated in the channel allocation process, and the predicted SINR γ _d value of this new terminal is the SINR required for communication. _A new terminal is accommodated when the _req value is satisfied. As a result, it is not necessary to calculate the predicted SINRγ _n of the terminal during communication when it is assumed that a new terminal has been accommodated, and it is possible to reduce the calculation amount in the channel allocation processing.

In the channel allocating method and apparatus according to the eleventh embodiment of the present invention, signal combining between the antennas of the adaptive array may be performed by a combining method other than the optimum combining method. Furthermore, in the channel allocation method and apparatus according to the eleventh embodiment of the present invention, transmission is performed on the terminal side when the SDMA method is applied to the CDMA method as in the sixth embodiment of the present invention described above. Power control may be performed. Furthermore, the channel assignment device according to the eleventh embodiment of the present invention can be applied to the communication system of the indoor environment as shown in FIG.

In the channel allocation method and apparatus of the present invention in the SDMA system having the time division multiplexed communication slots described above, the number of communication slots has been described as N slots from communication slots # 1 to #N. The number may be one (N = 1). In this case, as a result of executing the channel allocation processing in each embodiment, if it is determined that the channel allocation condition different in each of the above-described embodiments is satisfied, a new terminal is assigned to one communication slot. If it is accommodated and the channel allocation condition is not satisfied, it may be treated as a call loss.

[0093]

As described above, according to the present invention, when a new terminal is accommodated in each communication slot of the communication slot allocation candidates, the predicted signal-to-interference power ratio of all terminals in communication can be secured at a predetermined level or higher. Since the slot is selected from the communication slot allocation candidates, it is possible to sufficiently secure the communication quality of the terminal in communication even if a new terminal is accommodated. Further, when a communication slot in which the predicted signal-to-interference power ratio of the terminal being communicated can be secured at a small predetermined level different from the predetermined level of the new terminal is assigned as the communication slot for setting the channel of the new terminal, the new terminal is Will be able to proceed smoothly.

Furthermore, when it is assumed that the new terminal is accommodated, the new terminal is assigned a priority in the order of the calculated predicted signal-to-interference power ratio of the new terminal in the communication slot, and the communication slots are assigned in the order of priority. When the allocation candidate is used, many channels can be accommodated in one communication slot, and at the same time, a communication slot with a low utilization state can be created. In this way, by providing a difference in the usage state depending on the communication slot, it becomes possible to make the unused communication slot easy to use in another base station or the like. Furthermore, if the communication slots accommodating the new terminals are randomly given priority, and the communication slot allocation candidates are in the order of priority, the predicted signal pairs of the new terminals in all the communication slots when the new terminals are assumed to be accommodated are assumed. There is no need to calculate the interference power ratio. That is, since the predicted signal-to-interference power ratio of the new terminal has to be performed only for the communication slots required after the priority order is determined, the calculation amount can be reduced.

Furthermore, the predicted signal-to-interference power ratio of the new terminal and the predicted signal-to-interference power ratio of all terminals in communication are used by using the inter-element correlation information in the antenna means and the weight information set in the antenna means. By calculating, it becomes possible to apply even when a synthesis method other than the optimal synthesis method is used. Therefore, it can be applied to non-optimal combining reception such as diversity. Furthermore, using the inter-element correlation information in the antenna means and the reception information replaced as the transmission power of the new terminal has been transmission power controlled, the predicted signal-to-interference power ratio of the new terminal and all terminals in communication are used. By calculating the predicted signal-to-interference power ratio, it can be applied to a communication system that performs transmission power control.

Furthermore, in the code-space division multiple access system, by accommodating the new terminal when the new terminal is accommodated and the predicted signal-to-interference power ratio of the new terminal can be secured at a predetermined level or more. , CDMA method can be applied, and only the calculation of the predicted signal-to-interference power ratio of the new terminal needs to be performed, so that the calculation amount can be reduced. Furthermore, in the code-space division multiple access method, by accommodating the new terminal, when accommodating the new terminal, if the predicted signal-to-interference power ratio of all terminals in communication can be secured at a predetermined level or more, , CDMA systems can be combined and applied.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a base station including a channel allocation device according to a first embodiment of the present invention as a channel allocation unit.

FIG. 2 is a diagram showing a configuration of a base station antenna of a base station including the channel allocation device according to the first embodiment of the present invention.

FIG. 3 is a diagram showing a configuration of a channel format in the channel allocation device according to the first exemplary embodiment of the present invention.

FIG. 4 is a diagram showing a communication state of a base station including the channel allocation device according to the first embodiment of the present invention.

FIG. 5 is a diagram showing a channel state table in the channel allocation device according to the first exemplary embodiment of the present invention.

FIG. 6 is a diagram showing a flowchart of channel allocation processing in the channel allocation device according to the first embodiment of the present invention.

FIG. 7 is a diagram showing a predicted SNIR table for a new terminal in the channel allocation device according to the first exemplary embodiment of the present invention.

FIG. 8 is a diagram showing a predicted SNIR table for a terminal during communication in the channel allocation device according to the first exemplary embodiment of the present invention.

FIG. 9 is a diagram showing a CDMA channel format in a channel allocation device according to a second exemplary embodiment of the present invention.

FIG. 10 is a diagram showing a channel state table in the channel allocation device according to the second exemplary embodiment of the present invention.

FIG. 11 is a diagram showing a flowchart of channel allocation processing in the channel allocation device according to the second embodiment of the present invention.

FIG. 12 is a prediction SI for a new terminal and a terminal during communication in the channel allocation device according to the second exemplary embodiment of the present invention.
It is a figure which shows an NR table.

FIG. 13 is a diagram showing a new terminal predicted SNIR table in the channel allocation device according to the third exemplary embodiment of the present invention.

FIG. 14 is a diagram showing a predicted SNIR table for terminals during communication in the channel allocation device according to the third exemplary embodiment of the present invention.

FIG. 15 is a prediction SI for a new terminal and a terminal during communication in the channel allocation device according to the fourth exemplary embodiment of the present invention.
It is a figure which shows an NR table.

FIG. 16 is a diagram showing a predicted SNIR table for a new terminal in the channel allocation device according to the fifth embodiment of the present invention.

FIG. 17 is a diagram showing a predicted SNIR table for a terminal in communication in the channel allocation device according to the fifth embodiment of the present invention.

FIG. 18 is a prediction SI for a new terminal and a terminal during communication in the channel allocation device according to the sixth exemplary embodiment of the present invention.
It is a figure which shows an NR table.

FIG. 19 is a diagram showing a configuration of a communication system to which a channel allocation device according to a seventh exemplary embodiment of the present invention is applied.

FIG. 20 is a diagram showing a flowchart of channel allocation processing in the channel allocation device according to the eighth embodiment of the present invention.

FIG. 21 is a diagram showing a flowchart of channel allocation processing in the channel allocation device according to the ninth embodiment of the present invention.

FIG. 22 is a diagram showing a flowchart of channel allocation processing in the channel allocation device according to the eleventh embodiment of the present invention.

[Explanation of symbols]

1 base station, 2 control slots, 3 communication slots, 1
1 base station antenna, 111, 112, 113, 114
Antenna element, 12 channel management unit, 13 communication signal receiving unit, 14 communication state storing unit, 15 terminal signal separating unit, 16 signal demodulating unit, 17 control signal receiving unit, 18
Channel allocation unit, 19 utilization channel notification unit, 110a
~ 110f Indoor antenna, 111 Central control station, 11
2a to 112c terminals

─────────────────────────────────────────────────── ─── Continuation of front page (56) Reference JP-A-9-102979 (JP, A) JP-A-11-313364 (JP, A) JP-A-11-225369 (JP, A) JP-A-2000-106696 (JP, A) Special Table 7-505017 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H04B ^7/ 24-7/26 102 H04Q ^7/ 00-7/38

Claims (24)

(57) [Claims] 1. A channel allocation method in a multiple access system using a time domain and a space domain, wherein a communication slot in which a predicted signal-to-interference power ratio of a new terminal can be large when it is assumed that the new terminal is accommodated. The communication slot is a communication slot allocation candidate, and when the new terminal is accommodated in each communication slot of the communication slot allocation candidate, the communication slot is a communication slot that can secure a predicted signal-to-interference power ratio of all terminals in communication at a predetermined level or more. A channel allocation method, wherein the channel is selected from allocation candidates and is allocated as a communication slot for setting the channel of the new terminal. 2. A channel allocation method in a multiple access system using a time domain and a space domain, wherein a communication slot in which a predicted signal-to-interference power ratio of a new terminal when it is assumed to be accommodated is large When a new terminal is accommodated in each communication slot of the communication slot allocation candidates and the new terminal is accommodated, the predicted signal-to-interference power ratio of the new terminal can be secured at a predetermined level or more, and the predicted signal of the terminal in communication. A communication slot whose interference power ratio can be secured at a predetermined level or more different from the predetermined level of the new terminal is selected from the communication slot allocation candidates and assigned as a communication slot for setting the channel of the new terminal. Channel allocation method. 3. A channel allocation method in a multiple access method using a time domain and a space domain, wherein a predicted signal-to-interference power ratio of a new terminal in a communication slot when a new terminal is assumed to be accommodated is calculated. hand,
Priority is given to the communication slots in the ascending order of the calculated predicted signal-to-interference power ratio to make communication slot allocation candidates in order of priority, and the new terminal is accommodated in each communication slot of the communication slot allocation candidates. At this time, a communication slot that can secure the predicted signal-to-interference power ratio of all terminals in communication at a predetermined level or more is assigned as the communication slot for setting the channel of the new terminal by selecting from the communication slot assignment candidates in the priority order. A channel allocation method characterized by the above. 4. A channel allocation method in a multiple access system using a time domain and a space domain, wherein a communication slot accommodating a new terminal is randomly given a priority order,
When a new terminal is accommodated in the communication slot allocation candidate as a communication slot allocation candidate in the order of priority,
The predicted signal-to-interference power ratio of the new terminal can be secured at a predetermined level or more, and the predicted signal-to-interference power ratio of all terminals in communication when the new terminal is accommodated in the communication slot allocation candidate communication slot. A channel allocation method, wherein communication slots that can be secured at a predetermined level or higher are selected from the communication slot allocation candidates in the order of priority and are allocated as communication slots for setting channels of the new terminal. 5. The predicted signal-to-interference power of the new terminal using the inter-element correlation information for each communication slot in the antenna means having a plurality of antenna elements and the weight information set in the plurality of antenna elements. The channel allocation method according to any one of claims 1 to 4, wherein a ratio and a predicted signal-to-interference power ratio of all terminals in communication are calculated. 6. The new information is obtained by using inter-element correlation information for each communication slot in an antenna means having a plurality of antenna elements and reception information replaced by transmission power control of the transmission power of the new terminal. 5. The channel allocation method according to claim 1, wherein a predicted signal-to-interference power ratio of a terminal and a predicted-signal-to-interference power ratio of all terminals in communication are calculated. 7. The channel allocation method according to claim 1, further comprising distributed antenna means including a plurality of antenna elements. 8. A channel allocation method in a code-space division multiple access system, wherein a predicted signal-to-interference power ratio of a new terminal when it is assumed that the new terminal is accommodated can be secured at a predetermined level or more. , An interference parameter indicating the state of interference based on the current communication state , which is adapted to accommodate the new terminal.
Data before the channel allocation process
When performing the channel allocation process, the
The prediction signal based on the parameter and the interference parameter.
A channel allocation method characterized in that a signal-to -interference power ratio is calculated . 9. A channel allocation method in a code-space division multiple access system, wherein a predicted signal-to-interference power ratio of a new terminal can be large when it is assumed that the new terminal is accommodated. interference said upon receiving the new terminal, when a prediction signal-to-interference power ratio of all terminals in the communication can be secured above a predetermined level, said being adapted to accommodate the new terminal, based on the current communication state Interference parameter indicating the state of
Data before the channel allocation process
When the channel allocation process is performed, the number indicating the communication status of the new terminal is displayed.
One parameter, the second parameter indicating the communication status of the communicating terminal
The prediction signal based on the interference parameter and the interference parameter.
A channel allocation method characterized in that a signal-to -interference power ratio is calculated . 10. The predicted signal-to-interference power ratio of the new terminal and the during-communication using the inter-element correlation information in the antenna means including a plurality of antenna elements and the weight information set in the plurality of antenna elements. 10. The channel allocation method according to claim 8 or 9, wherein the predicted signal-to-interference power ratios of all the terminals are calculated. 11. A predicted signal pair of the new terminal using inter-element correlation information in an antenna means including a plurality of antenna elements and reception information replaced by transmission power control of the new terminal. 10. The channel allocation method according to claim 8 or 9, wherein an interference power ratio and a predicted signal-to-interference power ratio of all terminals in communication are calculated. 12. The channel allocation method according to claim 8 or 9, further comprising distributed antenna means having a plurality of antenna elements. 13. A channel allocating device in a multiple access system using a time domain and a space domain, wherein a communication slot capable of obtaining a large predicted signal-to-interference power ratio of the new terminal when it is assumed that the new terminal is accommodated. Selecting means for selecting as the communication slot allocation candidate, and the predicted signal-to-interference power ratio of all terminals in communication when the new terminal is accommodated in each communication slot of the communication slot allocation candidates selected by the selecting means. A channel allocating device, comprising: a channel allocating unit that allocates a communication slot that can be secured at a predetermined level or higher as a communication slot for selecting a channel from the communication slot allocation candidate and setting a channel of the new terminal. 14. A channel allocation device in a multiple access system using a time domain and a space domain, wherein a communication slot in which a predicted signal-to-interference power ratio of the new terminal is large when it is assumed that the new terminal is accommodated is provided. Selecting means for selecting as a communication slot allocation candidate, and a predicted signal-to-interference power ratio of all terminals in communication when the new terminal is accommodated in each communication slot of the communication slot allocation candidates selected by the selecting means. A communication slot that can be secured at a predetermined level or higher and at which the predicted signal-to-interference power ratio of the terminal being communicated can be secured at a predetermined level different from the predetermined level of the new terminal is selected from the communication slot allocation candidates, and the new slot of the new terminal Channel allocation means for allocating as a communication slot for setting a channel; Apparatus. 15. A channel allocation device in a multiple access method using a time domain and a space domain, wherein a predicted signal-to-interference power ratio of a new terminal in a communication slot when a new terminal is assumed to be accommodated is calculated. hand,
Selecting means for giving priority to the communication slots in order of decreasing calculated predicted signal-to-interference power ratio and selecting as communication slot allocation candidates in order of priority; and communication slot allocation candidates selected by the selecting means. In each of the communication slots, when accommodating the new terminal, a communication slot capable of ensuring a predicted signal-to-interference power ratio of all terminals in communication at a predetermined level or more is selected from the communication slot allocation candidates in the order of priority, and A channel allocating device comprising: a channel allocating means for allocating a channel of a new terminal as a communication slot. 16. A channel allocation device in a multiple access system using a time domain and a space domain, wherein a communication slot accommodating a new terminal is randomly given a priority order and selected as a communication slot allocation candidate in the order of the priority order. Selecting means, and when a new terminal is accommodated in the communication slot allocation candidate communication slot selected by the selecting means, the predicted signal-to-interference power ratio of the new terminal can be secured at a predetermined level or more, and the communication slot allocation is performed. When a new terminal is accommodated in a candidate communication slot, a communication slot that can secure the predicted signal-to-interference power ratio of all terminals in communication at a predetermined level or more is selected from the communication slot allocation candidates in the order of priority. Channel allocation means for allocating as a communication slot for setting the channel of the new terminal, A characteristic channel allocation device. 17. Inter-element correlation information for each communication slot in an antenna means having a plurality of antenna elements,
The weight information set in the plurality of antenna elements may be used to further include a calculation unit that calculates a predicted signal-to-interference power ratio of the new terminal and a predicted signal-to-interference power ratio of all terminals in communication. The channel allocation device according to any one of claims 13 to 16, characterized in that: 18. Inter-element correlation information for each communication slot in an antenna means having a plurality of antenna elements,
Using the received data replaced by the transmission power of the new terminal being transmission power controlled, the predicted signal to interference power ratio of the new terminal and the predicted signal to interference power ratio of all terminals in communication are calculated. The channel allocation device according to any one of claims 13 to 16, characterized by further comprising arithmetic means. 19. The channel allocation device according to claim 13, further comprising a distributed antenna means including a plurality of antenna elements. 20. A channel allocation device in a code-space division multiple access system, which calculates a predicted signal-to-interference power ratio of a new terminal when it is assumed that the new terminal is accommodated. If the predicted signal to interference ratio of the new terminal calculated by the calculating means can be secured above a predetermined level, said a channel allocation unit which is adapted to accommodate the new terminal, by the computing means, the current communication state Based on the state of interference
Prior to the channel allocation process
Hold and hold a new terminal when performing channel allocation processing.
In the parameter indicating the communication state of the and the interference parameter
A channel allocation device, wherein the predicted signal-to-interference power ratio is calculated based on the above . 21. A channel allocation device in a code-space division multiple access system, wherein a predicted signal-to-interference power ratio of a new terminal when it is assumed that the new terminal is accommodated is calculated, and the new terminal is calculated. And a calculation unit that calculates the predicted signal-to-interference power ratio of all terminals in communication, and the predicted signal-to-interference power ratio of the new terminal calculated by the calculation unit can be large, and If the predicted signal to interference power ratio of all terminals can be secured above a predetermined level, said a channel allocation unit which is adapted to accommodate the new terminal, the said computing means Zhou interference based on the current communication state
Prior to the channel allocation process
Hold and hold a new terminal when performing channel allocation processing.
Parameter indicating the communication status of the terminal, the communication status of the communicating terminal
The second parameter indicating the state and the interference parameter
A channel allocation device, wherein the predicted signal-to-interference power ratio is calculated based on the above . 22. The calculation means uses the inter-element correlation information in the antenna means including a plurality of antenna elements and the weight information set in the plurality of antenna elements, so that the predicted signal-to-interference power of the new terminal is obtained. 22. The channel allocation device according to claim 20, wherein a ratio and a predicted signal-to-interference power ratio of all terminals in communication are calculated. 23. The computing means uses the inter-element correlation information in an antenna means having a plurality of antenna elements and the reception information replaced by the transmission power of the new terminal being transmission power controlled, to thereby obtain the new information. 22. The channel allocation device according to claim 20, wherein the predicted signal-to-interference power ratio of the terminal and the predicted-signal-to-interference power ratio of all terminals in communication are calculated. 24. The channel allocation device according to claim 20, further comprising a distributed antenna means composed of a plurality of antenna elements.