JPH1141192A - Channel assignment control method for radio communication system and spreading code assignment control method and carrier assignment control method and radio communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure unused continuous frequency width, and to reduce the generation of the same channel interference by operating the assignment of frequency channels in two adjacent radio zones using the same frequency band by channel repetition preferentially from the mutually opposite edges of the available zone. SOLUTION: Frequency channels are assigned and arranged from the left side (low frequency side) of a whole frequency band 3-1 in response to calling from a terminal in a radio zone 3-2, and frequency channels are assigned and arranged from the right side (high frequency side) of the band 3-1 in response to calling from a terminal in a radio zone 3-3. Thus, unused continuous frequency width can be easily ensured at the right side of the band 3-1 in the radio zone 3-2, and at the left side of the band 3-1 in the radio zone 3-3. Moreover, the possibility of the generation of interference between adjacent radio zones using the same assigned band especially when traffic is small can be extremely reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio communication system permitting a plurality of frequency channel widths, and a CD permitting use of a plurality of spreading codes for transmitting and receiving a series of signals.
The present invention relates to a wireless communication system using an MA and a multicarrier wireless communication system that allows a plurality of carriers to be used for transmitting and receiving a series of signals.

[0002]

2. Description of the Related Art In a conventional wireless communication system, the frequency width of each channel used in the system is generally constant. In this case, when a new call is generated, as shown in FIG. 1, an unused channel (hereinafter, referred to as an empty channel) from among the available communication channels in the zone where the target terminal is located. Is selected and assigned to the terminal (Okumura, Shinji, "Basics of Mobile Communication", The Institute of Electronics, Information and Communication Engineers, p209). Channel selection from a plurality of free channels is performed at random because it has no effect on the system. In addition, CDMA (Code Divisio
In a wireless communication system using n Multiple Access (code division multiplexing), a series of signals is transmitted and received by using one spreading code of one code family in which several mutually orthogonal spreading codes are collected. It is usual to do.

On the other hand, with the spread of multimedia in recent years, since information including different transmission speeds is transmitted by one wireless communication system, a wireless communication system allowing a plurality of frequency channel widths or a series of signal transmission / reception is required. A wireless communication system using CDMA that allows use of a plurality of spreading codes is conceivable.

First, a radio communication system that allows a plurality of frequency channel widths will be described. As shown in FIG. 2, the frequency band 2-1 allocated to the radio system
If a call requesting a new wide frequency channel width 2-2 is made, the requested frequency channel width may be equal to or less than the requested frequency channel width, despite the presence of a free channel. There is a problem that a call may have to be dropped because there is no continuous unused area having a wider frequency width. In the case of a wireless communication system using CDMA that allows the use of a plurality of spreading codes for transmission and reception of a series of signals, the use of a large number of spreading codes is required if a plurality of spreading codes are randomly assigned. When a call is generated, the number of cases where a plurality of spreading codes having successive numbers can be assigned is reduced. Therefore, in the case of consecutive numbers, only the number of the first code to be used and the number of codes to be used in the spreading code family need be notified. Many control bits must be used to notify the spreading code number, and the ratio of bits used for the communication itself is relatively reduced, resulting in a problem that the frequency use efficiency is reduced. This problem also arises in multi-carrier wireless communication systems that allow the use of multiple carriers for transmitting and receiving a series of signals.

[0005] In particular, when it is necessary to allocate a channel or spread code during a call due to movement, the above procedure must be performed each time. It is desirable that the amount of information to be notified is small. In addition, when a minimum zone is used as in the case of future mobile communication, channel allocation or spreading code allocation during communication due to movement is frequently required. Therefore, information that needs to be notified to channel allocation or spreading code allocation during communication is required. If the volume is large, it becomes difficult to process such information when the traffic becomes large, and there is a problem that a call loss or the like occurs.

[0006]

As described above, in a radio communication system that allows a plurality of frequency channel widths, if allocation of free channels is continued at random,
When a call requesting a new wide frequency channel width occurs, if there is no unused area having a frequency width equal to or larger than the requested frequency channel width even though there are available channels, There has been a problem that the call may have to be dropped.

Further, when a plurality of spreading codes are randomly assigned to a wireless communication system using CDMA which permits the use of a plurality of spreading codes for transmission / reception of a series of signals, similarly to a conventional wireless system, When a new call requesting the use of a large number of spreading codes is made, the number of consecutive spreading codes that can be assigned is reduced, and more control bits are used to notify the number of each spreading code to be used. Therefore, there is a problem that the ratio of bits used for the communication itself is relatively reduced, and the frequency use efficiency is reduced.

In a multi-carrier wireless communication system that allows the use of a plurality of carriers for transmitting and receiving a series of signals, if a plurality of carriers are randomly assigned as in a conventional wireless system, a large number of carriers are newly added. When a call requiring use occurs, it is less likely that multiple carriers with consecutive numbers can be assigned, and many control bits must be used to indicate the number of each carrier to use, and the call itself However, there is a problem that the ratio of the bits used for the data transmission is relatively reduced, and the frequency utilization efficiency is reduced.

The present invention has been made to solve such a problem, and an FDM that allows a plurality of frequency channel widths is provided.
To provide a radio communication system capable of improving the frequency utilization efficiency of a radio communication system using FDMA and reducing the frequency of occurrence of channel interference between two adjacent radio zones, and a method of controlling channel allocation thereof And

Another object of the present invention is to improve the probability that a spreading code of a serial number can be assigned in a wireless communication system using CDMA that permits the use of a plurality of spreading codes for transmitting and receiving a series of signals. And a spread code allocation control method therefor.

Further, the present invention provides a multi-carrier radio communication system which allows a plurality of carriers to be used for transmitting and receiving a series of signals. It is an object of the present invention to provide a system and a carrier allocation control method thereof.

[0012]

In order to achieve the above object, a method of controlling channel allocation in a wireless communication system according to the present invention is directed to an FDM that allows a plurality of frequency channel widths.
Or two adjacent channels using the same frequency band by channel repetition in a wireless communication system using FDMA.
It is characterized in that allocation of frequency channels in one wireless zone is controlled so as to be preferentially performed from opposite ends of bands usable in these wireless zones.

According to this control method, even when a new call requesting a wide frequency channel width is generated, the probability of securing an unused continuous frequency width corresponding to the call can be increased, and the frequency of occurrence of co-channel interference can be increased. Can be reduced.

According to a second aspect of the present invention, there is provided a wireless communication system using FDM or FDMA permitting a plurality of frequency channel widths, wherein a plurality of wireless channels using the same frequency band by channel repetition. It is characterized in that allocation of frequency channels in the zones is controlled such that all available bands in these wireless zones are divided and priority is given to each of the partial areas assigned to each of the wireless zones, starting from the top. And

According to this control method, even when a new call requesting a wide frequency channel width is generated, the probability that an unused continuous frequency width corresponding to the call can be secured can be increased, and co-channel interference may occur. A wireless communication system that can be reduced can be realized.

In the above-described channel assignment control of the radio communication system, the frequency channel assignment is changed with respect to the temporal variation of the frequency band being used in each radio zone, thereby eliminating an unused area having a narrow frequency width. Thus, even when a call requiring a new wide frequency channel width is generated, the probability that an unused continuous frequency width corresponding to the call can be secured can be further increased, and co-channel interference can be further reduced. A communication system can be realized.

Furthermore, the spread code allocation control method for a wireless communication system according to the present invention uses CDMA that permits the use of a plurality of spread codes for transmitting and receiving a series of signals. In a wireless communication system, the assignment of spreading codes in two adjacent wireless zones using the same code family is preferentially performed from opposite ends of numbers assigned to spreading codes belonging to code families usable in these wireless zones. By controlling it to take place,
Even when a call that requires the use of a large number of spreading codes is newly generated, the probability of being able to assign multiple spreading codes of successive numbers increases, the amount of information for notifying the spreading codes to be used decreases, and the It is possible to relatively increase the ratio of bits used for the bit rate, and improve the frequency use efficiency.

According to a fifth aspect of the present invention, there is provided a spread code allocation control method for a wireless communication system, comprising:
In a wireless communication system using CDMA that allows use of a plurality of spreading codes for transmission and reception of a series of signals,
Spreading code allocation in a plurality of radio zones using the same code family is prioritized from the top of a plurality of code groups divided so that numbers assigned to spreading codes belonging to the code families usable in these radio zones are continuous. By performing such control, even if a call requesting the use of a large number of spreading codes is newly generated, the probability that a plurality of spreading codes with successive numbers can be assigned increases, and the spreading code to be used is increased. , The amount of information used for the communication itself can be relatively increased, and the ratio of bits used for the call itself can be relatively increased, thereby realizing a wireless communication system capable of improving the frequency use efficiency.

In the spread code allocation control of the wireless communication system, the spread code allocation is changed with respect to the temporal variation of the spread code in use in each wireless zone, so that the unused spread codes adjacent in the numerical order are changed. By eliminating the codes, even if a call that requires the use of a large number of spreading codes is newly generated, the probability that a plurality of spreading codes of successive numbers can be assigned further increases, and the notification of the spreading code to be used is performed. , The ratio of bits used for the call itself can be relatively increased, and the frequency use efficiency can be improved.

Further, according to a seventh aspect of the present invention, there is provided a carrier communication control method for a wireless communication system, wherein a plurality of carriers are used for transmitting and receiving a series of signals. In a communication system, control is performed such that assignment of carriers in two wireless zones using the same carrier set is performed preferentially from opposite ends of numbers assigned to carriers belonging to a carrier set usable in these wireless zones. By doing so, even when a call requesting the use of many new carriers occurs, the probability of being able to allocate a plurality of carriers of consecutive numbers increases, the amount of information for notifying the carriers to be used decreases, The ratio of bits used for the call itself can be relatively increased, and the frequency use efficiency can be improved.

According to the present invention, there is provided a method for controlling carrier allocation in a wireless communication system, comprising:
In a wireless communication system using a multicarrier that allows the use of a plurality of carriers for transmission and reception of a series of signals, the assignment of carriers in a plurality of wireless zones using the same carrier set may be performed by using carriers that can be used in these wireless zones. A call requesting the use of a large number of new carriers has been generated by controlling the numbers assigned to the carriers belonging to the set to be performed with priority from the beginning of a plurality of carrier subsets that have been divided so as to be consecutive. Also in this case, the probability that a plurality of carriers with consecutive numbers can be allocated increases, the amount of information for notifying the carrier to be used decreases, the ratio of bits used for the call itself can be relatively increased, and frequency usage can be increased. Efficiency can be improved.

In the above-described carrier allocation control method for a wireless communication system, a carrier allocation is changed in accordance with a temporal variation of a carrier being used in each wireless zone, thereby eliminating unused carriers adjacent in numerical order. By this means, even when a call requesting the use of many new carriers occurs, the probability of being able to allocate a plurality of carriers with consecutive numbers is further increased, and the amount of information for notifying the carriers to be used is reduced, It is possible to provide a wireless communication system capable of relatively increasing the ratio of bits used for a call itself and improving the frequency use efficiency.

[0023]

Embodiments of the present invention will be described below in detail.

First, a first embodiment of the present invention will be described with reference to FIGS.

As shown in FIG. 3, a frequency band 3-1 is assigned to the radio communication system of the present embodiment.
A service is provided in two wireless zones 3-2 and 3-3 at different locations. The frequency band 3-1 of the wireless communication system includes a plurality of frequency bands f1, f
.., F25. Here, each divided frequency band is called a “unit channel”.

In this radio communication system, information including different transmission rates is transmitted by one radio communication system, so that a plurality of frequency channel widths are allowed. Specifically, the exchange can be performed using a frequency channel width that is an integral multiple of the bandwidth of the unit channel. For example, a voice signal is transmitted using a frequency channel width of one unit channel, and a higher quality voice or data signal is transmitted by using a frequency channel width of two to three unit channels.
Furthermore, using a frequency channel width of four or more unit channels enables higher-speed data signal communication and image communication.

Here, it is assumed that a call requesting two unit channels occurs at the terminal 3-10 in the wireless zone 3-2. In this case, the frequency channel 3-4 is allocated and arranged on the left side (lower frequency side) of the entire frequency band 3-1. Hereinafter, the terminal 3-11 and the terminal 3 in the wireless zone 3-3.
-12, the terminal 3-13, and the terminal 3-14, the terminal 3-15 in the wireless zone 3-2 call in this order,
Frequency channels 3-5, 3-6, 3-7, 3-
8, 3-9 are allocated and arranged.

As described above, for a call from a terminal in the wireless zone 3-2, a frequency channel is allocated and arranged from the left side (lower frequency side) of the entire frequency band 3-1. -3 for outgoing calls from terminals within -3
The frequency channel is assigned from the right side of
Be placed.

As a result, in the wireless zone 3-2, the band 3
In the wireless zone 3-3, on the right side of the band 3-1 and on the left side of the band 3-1, it is easy to secure unused continuous frequency widths. Further, there is an effect that the possibility that interference between adjacent wireless zones using the same allocated band is particularly low when traffic is small is obtained. in addition,
Software transceivers (eg, Mitola, J., “The soft
ware radio architecture, ”IEEE Communication Magaz
ine, Vol.33, No.5 (May 1995). ) Or when the direct conversion transceiver is used for a radio station (for example, a base station) that needs to receive a plurality of frequency channels, the probability that the band in the case of batch modulation / demodulation becomes narrower than that in the case of random allocation. Therefore, it is possible to reduce receiver noise and avoid signal degradation due to wideband characteristics of the amplifier.

Next, as shown in FIG.
After communication regarding 3-14 (shown in FIG. 3 and not shown in FIG. 4) is finished and use of frequency channels 3-5 and 3-8 (shown in FIG. 3 and not shown in FIG. 4) is finished , A new terminal 4-10 in the wireless zone 3-3 makes a call and the unit channel 3
If one is requested, the wireless channel 3-3 has an unused area of three or more unit channels on the rightmost side of the band 3-1. Therefore, the frequency channel 4-1 is allocated and arranged at this position. Thus, in the wireless zone 3-3, it is possible to maintain a state in which an unused continuous frequency width is left on the left side of the band 3-1.

Next, the terminal 4-11 in the wireless zone 3-2
Makes a call and requests two unit channels, in the radio zone 3-2, the frequency channels 3-4 and 3-9 of the band 3-1.
Since there is no unused area of two or more unit channels, the frequency channel is allocated and arranged at the position 4-2 where the unused area of two or more unit channels is located on the leftmost side. Subsequently, when the terminal 4-12 in the wireless zone 3-2 calls and requests one unit channel, the wireless zone 3-2
Since there is one unused area of the unit channel between the frequency channels 3-4 and 3-9 of the band 3-1, the frequency channel 4-3 is allocated and arranged at this position. Thereby, in the wireless zone 3-2, it is possible to maintain a state in which an unused continuous frequency width is left as much as possible on the right side of the band 3-1.

FIG. 5 shows a second embodiment of the present invention.
In this embodiment, after the state of FIG.
Of the control signal between the base station 5-11 of the wireless zone 3-3 and the terminals 3-12 and 3-13 after the communication relating to the terminal 3-11 in the terminal is completed and the use of the frequency channel 3-5 is terminated. Through the exchange, the frequency channels 3-6 and 3-7 are changed to the frequency channels 5-1 and 5-2, respectively, so as to eliminate these right empty channel groups. After this change, when a new terminal 4-10 in the wireless zone 3-3 makes a call and requests three unit channels, the frequency is set to the position of 5-4 immediately adjacent to the leftmost channel after the change. Assign a channel. Accordingly, in the wireless zone 3-3, it is possible to maintain a state in which an unused continuous frequency width is left on the left side of the band 3-1 and, as shown in FIG. It is also possible to prevent an unused area having a narrow frequency width from remaining. Further, in this embodiment, after the communication regarding the terminal 3-14 in the wireless zone 3-2 shown in FIG. 3 ends and the use of the frequency channel 3-8 ends, the base station in the wireless zone 3-2 By exchanging control signals between the terminal 5-12 and the terminal 3-14, the frequency channel 3-9 is changed so that the left empty channel group is eliminated.
Change to -3. After this change, when the terminals 4-11 and 4-12 in the wireless zone 3-2 make a call and request two unit channels and one unit channel, respectively, the frequency is placed at the position on the right of the frequency channel 5-3. Channels 5-5 and 5-6 are allocated and arranged. Accordingly, in the wireless zone 3-2, it is possible to maintain a state in which an unused continuous frequency width is left on the left side of the band 3-1 and, as shown in FIG. It is also possible to prevent unused areas having a narrow frequency width from remaining between channels.

FIG. 6 shows a third embodiment of the present invention.
This wireless communication system is assigned a frequency band 6-1 and has four wireless zones 6-2 and 6 at different locations.
Services are provided at -3, 6-4, and 6-5. The frequency band 6-1 of the wireless communication system is divided into a plurality of frequency bands f1, f2,..., F25 for each certain frequency width. In this wireless communication system, as in the previous embodiments, information including different transmission rates is transmitted by one wireless communication system, so that a plurality of frequency channel widths are allowed.

The frequency band 6-1 is divided into four partial areas a, b, c, d (6-6, 6-7, 6-8, 6-9). It is conceivable that this division method is largely distributed to a place where there is a lot of traffic by reflecting the traffic prediction of each wireless zone. Further, when such prediction is difficult, it is conceivable to divide almost equally.
Here, suppose that a call requested for two unit channels is generated at the terminal 6-10 in the wireless zone 6-2. On the other hand, the frequency is located at the leftmost (lower frequency) side of the partial area 6-6. Channels 6-20 are allocated and arranged. Hereinafter, a terminal 6-11 in the wireless zone 6-3, a terminal 6-12 in the wireless zone 6-4, a terminal 6-13 in the wireless zone 6-5, a terminal 6-14 in the wireless zone 6-2, When the terminals 6-15 in the radio zone 6-4 call in this order, the frequency channels 6-21, 6-22, 6-23, 6-24,
6-25 are allocated and arranged.

As described above, for a call from a terminal in the wireless zone 6-2, the number of unit channels requested from the left end (lower frequency) of the partial area a (6-6) is the same. Unused areas equal to or more than that are sequentially allocated and arranged as frequency channels. Similarly, the wireless zones 6-3, 6-
4 and 6-5, the partial areas b, c, d (6-7, 6-8, 6-9: f in FIG.
9, f14, and f22), unused areas equal to or more than the number of unit channels requested from the left end are sequentially allocated and arranged as frequency channels.

Thus, each of the partial areas a, b, c, d
In (6-6, 6-7, 6-8, 6-9), it is easy to secure unused continuous frequency widths on the far side from the left end to the right. Further, similarly to the first embodiment, an effect is obtained that the possibility that interference between adjacent wireless zones using the same allocated band occurs particularly when traffic is small is extremely low. In addition, similarly to the first embodiment, when a software transceiver or a direct conversion transceiver is used for a radio station (for example, a base station) that needs to receive a plurality of frequency channels, and is randomly assigned. In comparison with the above, the probability of narrowing the band in the case of batch modulation / demodulation increases, so that it is possible to reduce receiver noise and avoid signal degradation due to the wide band characteristics of the amplifier. Also in the present embodiment, after this, after the communication regarding some terminals is completed and the use of the frequency channel used in those communication is completed, a terminal in the wireless zone newly makes a call and one to one. When requesting more unit channels, as in the first embodiment shown in FIG. 4, the unused areas equal to or more than the number of unit channels requested from the beginning of the partial area are sequentially assigned. By allocating and arranging as a frequency channel, it is possible to maintain a state in which a continuous frequency width unused in the wireless zone is left as much as possible.

Further, similarly to the second embodiment shown in FIG. 5, by exchanging control signals between the base station in the radio zone and a group of terminals in a call, the frequency channel in use is changed to a partial area. By changing the frequency so as to reduce the frequency from the beginning, it is possible to maintain the unused continuous frequency width in the radio zone as much as possible, and to set the unused frequency band between the allocated frequency channels. It is also possible to prevent a narrow area from remaining.

In the embodiment described above, the number of partial regions is four. However, the generality is not lost even if the number is two or more and up to the number of unit channels.

In the above-described embodiment, the TDD system or the packet communication system using the same frequency for the uplink and the downlink, or a radio communication system equivalent thereto is used. The same effect can be obtained for a system and a wireless communication system equivalent thereto by adopting any of the channel allocation control methods described in the above embodiments for each band. Note that the same allocation method or different allocation methods may be used for uplink and downlink frequency bands. For example, when the upstream traffic is smaller than that of the downstream, the frequency of the upstream band is frequently changed so as to close the gap, and the downstream is similarly changed at the same time interval. It is also conceivable to reduce the amount of work related to control by taking a larger value.

As shown in FIG. 7, each of the four partial regions a, b, c, d (6-6, 6-7, 6-8,
In 6-9), in the partial area a, the frequency channel 6-31 is allocated from the left end, in the partial area b, the frequency channel 6-32 is allocated from the right end, and in the partial area c, the frequency channel 6-33 is allocated from the left end. In d, by assigning the frequency channel 6-34 from the right end, each of the partial areas a, b, c, d (6-6, 6-7,
6-8, 6-9), an unused continuous frequency width can be secured, and an unused frequency band having a wider frequency width than the unused continuous frequency width obtained in the third embodiment of FIG. It becomes easy to secure.

FIGS. 8 and 9 show a fourth embodiment of the present invention. This wireless communication system uses CDMA. This radio communication system is assigned the spreading code family 7-1 shown in FIG. 8, and services are provided in two radio zones 7-2 and 7-3 at different locations. There are 25 codes in the spreading code family 7-1, and the numbers are assigned from c1 to c25, respectively.

In this CDMA radio communication system, a plurality of spreading codes can be used for transmitting and receiving a series of signals in order to transmit a signal of an equivalently wide band. For example, by using one or two spreading codes to transmit a voice signal, by using two or three codes, it is possible to transmit a higher quality voice or data signal, and furthermore to transmit four or more signals. By using a spreading code, a higher speed data signal or image signal can be transmitted.

Here, if a call requesting two spreading codes occurs at terminal 7-10 in radio zone 7-2,
On the other hand, two codes 7-4 (C1, C2) on the smaller side (left side in the figure) of the spreading code family 7-1 are assigned. Hereinafter, terminal 7-11 in wireless zone 7-3, terminal 7-12 in wireless zone 7-3, terminal 7-13 in wireless zone 7-3, terminal in wireless zone 7-2, 7-14 ,
When the terminal 7-15 in the wireless zone 7-2 calls in this order, the code groups 7-5, 7-6, 7-7, 7-
8, 7-9 are allocated and arranged.

As described above, to a call from a terminal in the wireless zone 7-2, a code is assigned from the side of the spreading code family 7-1 having a smaller number (left side in the figure).
-3 for a call from a terminal in -3.
Are assigned from the side with the larger number (right side in the figure). Thereby, on the right side of the code group 7-1 in the wireless zone 7-2, and on the left side of the code group 7-1 in the wireless zone 7-3,
A continuous spreading code of an unused number can be secured. Therefore, in many cases, only the number of the first code to be used and the number of codes to be used in the spreading code family need to be notified, and the number of control bits for notifying the numbers of the respective spreading codes to be used can be reduced. The ratio of bits used for the bit rate is relatively increased, and the frequency use efficiency can be improved.

Next, as shown in FIG. 9, the terminal 7-14 (shown in FIG. 8 and not shown in FIG. 9) in the wireless zone 7-2 terminates the communication, and also ends in the wireless zone 7-2. When the terminal 8-11 calls and requests two spreading codes, the wireless zone 7-
In No. 2, since there is no more than one unused code between the used code groups 7-4 and 7-9, the position at the position 8-2 where there are two or more unused codes on the leftmost side is next. A code is assigned. Subsequently, when the terminal 8-12 in the wireless zone 7-2 makes a call and requests one code, in the wireless zone 7-2, the unit channel is placed between the used code groups 7-4 and 7-9. Since there is one unused code, this code is assigned. As a result, in the wireless zone 7-2, it is possible to maintain a state in which continuous codes of unused numbers are left as much as possible on the right side of the spreading code family 7-1.

FIG. 10 shows a fifth embodiment of the present invention. In this embodiment, after the state of FIG.
After completion of the communication related to and the use of the code group 7-5, the base station 9-11 and the terminal 7-1 in the wireless zone 7-3 are terminated.
The code groups 7-6 and 7-7 are changed to code groups 9-1 and 9-2, respectively, so as to eliminate these unused codes by exchanging control signals between 2, 7-13. I do. After this change, the terminal 8- in the wireless zone 7-3 is newly added.
When 10 calls and requests three codes, a code 9-4 immediately adjacent to the leftmost code after the change is assigned. As a result, in the wireless zone 7-3, it is possible to maintain a state in which a continuous code group of unused numbers is left on the left side of the code family 7-1, and to keep unused code groups among the allocated code groups. It is also possible to prevent an area having a small number of codes from remaining.

In the present embodiment, the terminal 7-
14 and the use of the code group 7-8 ends, the base station 9-12 and the terminal 7- in the wireless zone 7-2.
14 through the exchange of control signals with the code group 7-.
9 so as to eliminate this unused code on the left,
Make the change to 3. After this change, when the terminals 8-11 and 8-12 in the wireless zone 7-2 call and request two codes and one code, respectively, the code is placed in the position immediately to the right of 9-3 in the code group. Groups 9-5, 9-6 are assigned. As a result, in the wireless zone 7-2, it is possible to maintain a state in which a continuous code of an unused number is left on the left side of the code family 7-1, and to use the unused code among the assigned code groups. It is also possible to prevent an area having a small number of codes from remaining.

FIG. 11 shows a sixth embodiment of the present invention. This wireless communication system is assigned a spreading code family of 10-1, and services are provided in four wireless zones 10-2, 10-3, 10-4, and 10-5 at different locations. There are 25 codes in the spreading code family 10-1, and they are numbered c1 to c25, respectively. In this wireless communication system, as in the above embodiment, information including different transmission rates is transmitted by one wireless communication system, so that a plurality of spread codes are allowed to be used.

The spreading code family of 10-1 has four partial areas a, b, c, d (10-6, 10-7, 10-8, 10-8).
-9). It is conceivable that this division method is largely distributed to a place where there is a lot of traffic by reflecting the traffic prediction of each wireless zone. Further, when such prediction is difficult, it is conceivable to divide almost equally.

If it is assumed that a call requesting two spreading codes is generated at terminal 10-10 in radio zone 10-2, on the other hand, a call is made to the leftmost side (lower number side) of partial area 10-6. ) Are assigned. Less than,
Terminal 10-11 in wireless zone 10-3, wireless zone 1
0-10, terminal 10-12 in wireless zone 10-5, terminal 10-13 in wireless zone 10-2
4. When the terminals 10-15 in the wireless zone 10-4 call in this order, the code groups 10-21, 10-2
2, 10-23, 10-24, and 10-25 are assigned.

As described above, for a call from a terminal in the wireless zone 10-2, the number of codes required from the left end (lower number) of the partial area a (10-6) is equal to or less than the required number. The unused code groups are sequentially allocated. Similarly, for calls from terminals in the wireless zones 10-3, 10-4, and 10-5, the partial areas b, c, and d (10-7, 10-
8, 10-9: Unused code groups equal to or more in number than the requested number of codes from the left end of c9, c14, c22) are allocated in order.

Thus, each of the partial areas a, b, c, d
In (10-6, 10-7, 10-8, 10-9), it becomes easy to secure unused continuous codes on the far side from the left end to the right. Further, similarly to the fifth embodiment, an effect is obtained that the possibility that interference between adjacent wireless zones using the same code family occurs particularly when traffic is small is extremely low.

Also in the present embodiment, after this, after the communication relating to some terminals has been completed and the use of the codes used in those communication has been completed, a terminal in the wireless zone newly makes a call. When one or more codes are requested, as in the fifth embodiment shown in FIG. 9, the number of unused codes equal to or more than the number of codes requested from the beginning of the partial area is obtained. Make an assignment. As a result, it is possible to maintain a state in which consecutive codes of unused numbers are left as much as possible in each wireless zone.

Also, similarly to the fifth embodiment shown in FIG. 10, the exchange of control signals between the base station in the radio zone and the group of terminals during a call causes the code groups in use to be changed to respective parts. By changing the code so that it is packed to the head of the area, it is possible to maintain a state in which unused codes whose numbers are consecutive in the wireless zone are kept as much as possible, and between the allocated code groups. An unused area with a small number of codes can be prevented from remaining.

In the above-described embodiment, the number of partial areas is four, but this number may be any number from 2 to the total number of codes.

In the above-described embodiment, the frequency band or the spreading code family used by another system exists on both sides of the frequency band or the spreading code family assigned to the radio communication system. However, even when these systems are the same system like a mobile phone system and are used in a zone other than the corresponding wireless zone, the effect obtained in the above embodiment is not lost.

Further, in each of the fourth, fifth, and sixth embodiments, a wireless communication system using CDMA that permits the use of a plurality of spreading codes for transmitting and receiving a series of signals has been described. In a multi-carrier wireless communication system that allows the use of a plurality of carriers for transmitting and receiving signals, a code is replaced by a carrier, a spreading code family is a set of carriers, and a code group is replaced by a subset of the carriers. A similar effect can be obtained by a method similar to the method described in each of the fifth and sixth embodiments.

In the above-described embodiment, the TDD system or the packet communication system using the same frequency for the uplink and the downlink, or a radio communication system equivalent thereto is used. For a system or a wireless communication system equivalent thereto, the same effect can be obtained for each band by adopting any of the methods described in the above embodiments. Note that the same code allocation method may be used for the uplink and downlink frequency bands, or different code allocation methods may be used. For example, if the traffic on the upstream is smaller than that on the downlink, the respective codes are frequently changed so as to close the gap for the upstream band, and the same change time interval is used for the downstream for the upstream. It is also conceivable to reduce the amount of work related to control by taking a larger value.

FIG. 12 is a block diagram showing an example of an apparatus for realizing the embodiment shown in FIGS. 3 and 5, and FIG.
FIG. 3 shows an example of a control flow in the case of using the apparatus shown in FIG.

The radio transmission / reception unit 12-1 realizes communication between the terminal and its communication partner by exchanging radio signals with the terminal. The wireless transmission data forming unit 12-2 includes a communication partner transmission data extracting unit 12-
The communication data extracted in step 3 and various control data (for example, channel allocation data, transmission power control data, data format, QoS request contents, error control, continuation and start / end of communication), etc. It is configured to conform to the format and sent to the wireless transmission / reception unit 12-1. The wireless reception data extraction unit 12-4 extracts communication data to be sent to the communication partner from the reception data from the terminal sent from the wireless transmission / reception unit 12-1 and extracts the communication data to be sent to the communication partner.
-5, and various control data and the like are extracted and sent to the communication management device 12-6 and other control devices (not shown in FIG. 12). Communication status management device 12-
6 manages the status of communication between the terminal and its communication partner.
The channel assignment management device 12-7 exchanges the communication status between the communication status management device 12-6 and the terminal and the communication partner thereof, and allocates a channel to be used for communication between the terminal and the communication partner. It manages and sends local signal and other channel assignment information necessary for controlling the radio circuit to the radio transmission / reception unit 12-1.

An example of the control flow shown in FIG. 13 will be described below. It is assumed that these controls are performed mainly by the channel assignment management device 12-7 in FIG. At the start of system use, N (USED) indicating the number of used unit channels is set to zero. Next, whether there is a new channel request is checked by exchange with the communication status management device 12-6.

If there is a new channel request, the following processing is performed. First, the number of unit channels requested in the channel request is defined as N (D). If N (D) exceeds a difference obtained by subtracting the number of used unit channels N (USED) from the total number of unit channels N (TOTAL) prepared in the system, the number of unit channels becomes larger. Run short.
Therefore, after rejecting the channel assignment and notifying the terminal that has requested the channel assignment or the other party that has requested a call with the terminal, the process returns to immediately before the process of checking for a new channel request. If the number of unit channels is not insufficient, the unit channel number assigned to each unit channel in order of frequency is (N (USED) +1).
No. to (N (USED) + N (D)) are allocated to the channel request, the number of unit channels N (USEI)) is increased by N (D), and a new channel request is checked. Return to just before.

If there is no new channel request,
Check if any terminal has terminated communication since the last check. If not, the process returns immediately before the process of checking for a new channel request. If there is a terminal that has finished communication, the following processing is performed. First, the unit channel number used in the completed communication is confirmed. Here, from (N (F) +1) to (N (F) + N (U))
Up to the number). If (N (F) + N (U)
If the unit channels after the (+1) th are already allocated and used, the (N (F) + N (U) +1) to the N (U)
The communication allocated up to the number SED) is re-allocated from the number (N (F) +1) to the number N (USED) -N (U). For example, when the device shown in FIG. 12 is used, the channel assignment management device
2 to notify the terminal of the channel change and its timing to the terminal, and to the radio transmitting and receiving unit 12-1 by transmitting a local signal and other channel allocation information necessary for controlling the radio circuit. Done. Thereafter, regardless of whether or not the (N (F) + N (U) +1) -th and later unit channels have been used, the number N (USED) of unit channels is reduced by N (U), and The process returns immediately before the process for checking a proper channel request. In the description of FIG. 12 and FIG. 13, the unit channel is replaced with a spreading code or a carrier, respectively, so that a plurality of spreading codes can be used for transmitting and receiving a series of signals. The device and control flow as described above can also be used in a wireless communication system using a multicarrier that allows the use of a plurality of carriers for transmission and reception.

[0064]

As described above, according to the channel assignment control method for a radio communication system of the present invention, the assignment of frequency channels in two adjacent radio zones using the same frequency band by repeating the channel is performed. In the case where a call requesting a new wide frequency channel width is generated, the unused continuous frequency width corresponding to the new frequency band can be controlled by performing control so that priority is given to the opposite end of the available band in The probability of securing can be increased, and the possibility of co-channel interference can be reduced. Also,
Assignment of frequency channels in a plurality of wireless zones using the same frequency band by channel repetition is prioritized from the top of each partial area assigned to each wireless zone by dividing the entire band usable in these wireless zones. By doing so, even when a new call requesting a wide frequency channel width occurs, the probability that an unused continuous frequency width corresponding to the call can be secured can be increased, and the possibility of co-channel interference occurring can be reduced. .

In the above-described channel allocation control method for a wireless communication system, a frequency channel allocation is changed in response to a temporal variation of a frequency band being used in each wireless zone, so that an unused area having a narrow frequency width is obtained. By eliminating this, even when a call requesting a new wide frequency channel width occurs, the probability that an unused continuous frequency width corresponding to the call can be secured can be further increased, and the case where co-channel interference occurs can be further reduced. A wireless communication system can be realized.

According to the spread code allocation control method for a wireless communication system of the present invention, spread code allocation in two adjacent wireless zones using the same code family is assigned to a code family usable in these wireless zones. By giving priority to the opposite ends of the numbers assigned to the spreading codes to which they belong, it is possible to allocate a plurality of spreading codes of successive numbers even when a call requesting the use of a large number of new spreading codes occurs. As a result, the amount of information for notifying the spreading code to be used is reduced, the ratio of bits used for the communication itself can be relatively increased, and the frequency use efficiency can be improved.

Further, the allocation of spreading codes in a plurality of radio zones using the same code family is performed by dividing a plurality of codes divided so that the numbers assigned to the spreading codes belonging to the code families usable in these radio zones are continuous. By giving priority from the top of the group, even if a call requesting the use of a large number of spreading codes is newly generated, the probability that a plurality of spreading codes with successive numbers can be assigned increases, and the spreading code to be used is increased. , The amount of information for notifying the call decreases, the ratio of bits used for the call itself can be relatively increased, and the frequency use efficiency can be improved.

Further, in the spread code allocation control of the wireless communication system, by changing the spread code allocation with respect to the temporal variation of the spread code being used in each wireless zone, unused spread adjacent code numbers can be changed. By eliminating the codes, even if a call that requires the use of a large number of spreading codes is newly generated, the probability that a plurality of spreading codes of successive numbers can be assigned further increases, and the notification of the spreading code to be used is performed. , The ratio of bits used for the call itself can be relatively increased, and the frequency use efficiency can be improved.

Further, according to the carrier allocation control method for a radio communication system of the present invention, the allocation of carriers in two radio zones using the same carrier set is assigned to carriers belonging to a carrier set usable in these radio zones. By giving priority to the opposite ends of the given numbers, even if a call requesting the use of a larger number of carriers occurs, the probability of being able to assign a plurality of carriers of successive numbers is increased and used. The amount of information for carrier notification is reduced, the ratio of bits used for the call itself can be relatively increased, and the frequency use efficiency can be improved.

Further, the assignment of carriers in a plurality of radio zones using the same carrier set is performed by dividing a plurality of carrier subsets divided such that numbers assigned to carriers belonging to a carrier set usable in these radio zones are continuous. By giving priority to the top of the list, even if a call requesting the use of a large number of carriers occurs, the probability that multiple carriers with consecutive numbers can be assigned increases. , The ratio of bits used for the call itself can be relatively increased, and the frequency use efficiency can be improved.

Further, in the carrier allocation control method for a radio communication system, the carrier allocation is changed in accordance with the time variation of the carrier being used in each radio zone, thereby eliminating unused carriers adjacent in numerical order. By this means, even when a call requesting the use of many new carriers occurs, the probability of being able to allocate a plurality of carriers with consecutive numbers is further increased, and the amount of information for notifying the carriers to be used is reduced, It is possible to provide a wireless communication system capable of relatively increasing the ratio of bits used for a call itself and improving the frequency use efficiency.

[Brief description of the drawings]

FIG. 1 is a diagram showing a channel assignment method of a conventional wireless communication system.

FIG. 2 is a diagram showing a conventional channel allocation method in a wireless communication system that allows a plurality of frequency channel widths.

FIG. 3 is a diagram showing a channel assignment method in the wireless communication system according to the first embodiment of the present invention.

FIG. 4 is a diagram showing a channel assignment change in the wireless communication system according to the first embodiment;

FIG. 5 is a diagram showing a channel assignment method in the wireless communication system according to the second embodiment of the present invention.

FIG. 6 is a diagram showing a channel assignment method in a wireless communication system according to a third embodiment of the present invention.

FIG. 7 is a diagram showing a modification of the channel assignment method of the wireless communication system according to the third embodiment of the present invention.

FIG. 8 is a diagram showing a spreading code assignment method in a wireless communication system according to a fourth embodiment of the present invention.

FIG. 9 is a diagram showing a spreading code assignment method in the wireless communication system according to the fourth embodiment.

FIG. 10 is a diagram showing a spread code assignment change in the wireless communication system according to the fifth embodiment of the present invention.

FIG. 11 is a diagram illustrating a spreading code assignment method in a wireless communication system according to a sixth embodiment of the present invention.

FIG. 12 is a block diagram showing the configuration of an apparatus for realizing the wireless communication system according to the embodiment shown in FIGS. 3 and 5;

FIG. 13 is a flowchart showing a control flow of the apparatus of FIG. 12;

[Explanation of symbols]

3-1, 6-1: Frequency band of wireless communication system 2-2, 3-3: Wireless zone 3-5 to 3-9: Frequency channel 3-10 to 3-15, 4-10 ４−4-12 Terminals 5-11 to 5-12 Base station 4-1 to 4-3 Assigned frequency channels 5-1 to 5-6 周波 数 Frequency channels after assignment change 6 2-6-5, 7-2, 7-3, 10-2 to 10-5
... wireless zone 6-6 to 6-9 ... partial area of system frequency band 6-20 to 6-25 ... frequency channel 7-1, 10-1 ... spreading code family of wireless communication system 7-4 ... 7-9 Assigned code group 7-10-7-15 Terminal 8-1 to 8-3, 9-1 to 9-6 Code group after assignment change 10-10 to 10-15 Terminal 10-20 to 10-25... Assigned code group

Claims (15)

[Claims] In a wireless communication system using FDM or FDMA that allows a plurality of frequency channel widths, allocation of frequency channels in two adjacent wireless zones using the same frequency band by channel repetition is performed in these wireless zones. A channel allocation control method for a wireless communication system, characterized in that control is performed in such a manner that priority is given to the opposite ends of the bands that can be used in (1). 2. In a wireless communication system using FDM or FDMA that allows a plurality of frequency channel widths, allocation of frequency channels in a plurality of wireless zones using the same frequency band by channel repetition is used in these wireless zones. A channel allocation control method for a wireless communication system, characterized in that control is performed such that all possible bands are divided and priority is given to each partial area associated with each wireless zone from the beginning. 3. The channel assignment control method for a wireless communication system according to claim 1, wherein the assignment of frequency channels is changed with respect to a temporal variation of a frequency band used in each of the wireless zones. Channel allocation control method for a wireless communication system. 4. In a wireless communication system using CDMA that allows the use of a plurality of spreading codes for transmission and reception of a series of signals, the assignment of spreading codes in two adjacent wireless zones using the same code family includes: A spread code allocation control method for a wireless communication system, characterized in that control is performed such that numbers given to spreading codes belonging to code families usable in these wireless zones are preferentially performed from opposite ends. 5. A wireless communication system using CDMA that permits the use of a plurality of spreading codes for transmission and reception of a series of signals, wherein the assignment of the spreading codes in a plurality of wireless zones using the same code family is performed by the wireless communication system. A spreading code for a wireless communication system, wherein control is performed such that numbers assigned to spreading codes belonging to code families usable in a zone are preferentially performed from the head of a plurality of code groups divided so as to be continuous. Assignment control method. 6. The spread code allocation control method for a wireless communication system according to claim 4, wherein the spread code allocation is changed with respect to a temporal variation of the spread code used in each of the wireless zones. Spread code allocation control method for a wireless communication system. 7. In a wireless communication system using a multicarrier that allows a plurality of carriers to be used for transmission and reception of a series of signals, the assignment of carriers in two wireless zones using the same carrier set is performed in these wireless zones. A carrier assignment control method for a wireless communication system, characterized in that control is performed such that priority is given to opposing ends of numbers assigned to carriers belonging to a carrier set usable in (1). 8. In a wireless communication system using a multicarrier that allows a plurality of carriers to be used for transmission and reception of a series of signals, the assignment of carriers in a plurality of wireless zones using the same carrier set is performed in these wireless zones. Carrier allocation control for a wireless communication system, characterized in that control is performed such that numbers assigned to carriers belonging to a carrier set usable in a plurality of carrier subsets are divided and arranged so as to be preferentially performed from the beginning. Method. 9. The carrier allocation control method for a wireless communication system according to claim 7, wherein a carrier allocation is changed in response to a temporal variation of a carrier being used in each of the wireless zones. A carrier allocation control method for a communication system. 10. In a radio communication system using FDM or FDMA that allows a plurality of frequency channel widths, frequency channels are allocated to two adjacent radio zones using the same frequency band by channel repetition. Wireless communication system comprising means for performing control so as to preferentially start from opposite ends of bands available for use in the wireless communication system. 11. In a radio communication system using FDM or FDMA that allows a plurality of frequency channel widths, frequency channel allocation in a plurality of radio zones using the same frequency band by channel repetition is used in these radio zones. A wireless communication system, comprising: means for dividing all possible bands and performing control from the head of each partial area corresponding to each of the wireless zones so that the partial area is prioritized. 12. A wireless communication system using CDMA that allows the use of a plurality of spreading codes for transmission and reception of a series of signals, wherein the assignment of spreading codes in two adjacent wireless zones using the same code family is performed. A wireless communication system comprising: means for controlling so that numbers given to spreading codes belonging to code families usable in these wireless zones are given priority from opposite ends. 13. A wireless communication system using CDMA that allows the use of a plurality of spreading codes for transmission and reception of a series of signals. In a wireless communication system using CDMA, allocation of spreading codes in a plurality of wireless zones using the same code family is performed. A wireless communication system, comprising: means for performing control so that priority is given to the head of a plurality of code groups divided so that numbers assigned to spreading codes belonging to code families usable in a zone are continuous. . 14. A wireless communication system using a multicarrier that allows a plurality of carriers to be used for transmission and reception of a series of signals. In the wireless communication system, the assignment of carriers in two wireless zones using the same carrier set is performed. A wireless communication system comprising: means for controlling priority from the opposite ends of the numbers assigned to the carriers belonging to the carrier set usable in (1). 15. A wireless communication system using a multicarrier that allows a plurality of carriers to be used for transmitting and receiving a series of signals. In the wireless communication system, a carrier is assigned in a plurality of wireless zones using the same carrier set. A wireless communication system comprising: means for performing control so that priority is given to a plurality of carrier subsets divided such that numbers assigned to carriers belonging to a carrier set usable in the above are consecutive.