WO2009093298A1 - Resource allocation control method and base station - Google Patents

Abstract

A certain amount of resources is allocated to a first call in which the amount of resource allocation is constant during communication, a predetermined virtual amount of resources is allocated to a second call in which the amount of the resource allocation is variable during communication, and resource allocation to a new call is controlled on the basis of the total sum of the amount of the resource allocation allocated to each of the first and second calls and the total amount of the shared resources.

Description

Resource allocation control method and base station

The present invention relates to a resource allocation control method and a base station. The present invention is suitable for use in resource management for a plurality of types of calls including, for example, a call whose resource used for call processing during communication may vary.

In the current communication system, there are multiple types of calls such as voice calls and packet calls. In addition, although the resource usage required for communication by each call is different, the resource usage during call continuation (during communication) is constant.

As the resource management (allocation) technique for a call having a constant resource usage amount during communication in this way, for example, the techniques disclosed in Patent Documents 1 and 2 below can be cited.

That is, in Patent Document 1, the total amount of resources currently used for communication is calculated, and in the acceptance determination at the time of call setting, the calculated total amount of resources being used and a predetermined threshold for call setting Can be used to determine whether call setup is possible, so that call loss rates for call types with different required resource amounts can be maintained fairly, such as wideband and narrowband calls, and limited resources can be used effectively. It is described that it can be used.

Further, Patent Document 2 collects information on the number of held CS (Circuit-Switched) calls and PS (Packet-Switched) calls that are scheduled to be processed in each call processing device or currently being processed, and sets the number of PS calls to be retained. Is multiplied by a predetermined weighting factor, the sum of the number of PS calls held and the number of CS calls held multiplied by this weighting factor is calculated, and the call processing device with the smallest sum is designated as the call processing device with the smallest load. It is described that it is evaluated. Further, when processing other than CS call or PS call processing is allocated to the call processing device, the processing is applied to the call processing device having the smallest value obtained by adding the numerical value corresponding to the load amount of the processing and the sum. The assignment is also described. And according to this technique, it is said that the load distribution process with high accuracy adapted to the actual use of resources for call processing can be realized.

Japanese Patent Laid-Open No. 11-41239 JP 2006-270381 A

However, all of the above-described conventional techniques are intended for calls in which the amount of used resources (resource allocation amount) during communication is constant, and the amount of used resources during communication is not constant, and the amount of unused resources and propagation paths It does not target a best-effort type call such as a call that can change from moment to moment depending on the environment, for example, a call in HSUPA (HighＡSpeed Uplink Packet Access).

For this reason, the above-described conventional technology does not assume a case where a call with a constant amount of used resources during communication and a call with a variable amount of used resources during communication are mixed.

One of the objects of the present invention is to enable efficient resource management (assignment) for a plurality of types of calls including calls whose usage resource amount fluctuates during communication.

Also, it is another object of the present invention to enable resource management that can reduce the probability (call loss rate) of failing to accept an emergency call such as a high-priority call or a 110 call.

In addition, the present invention is not limited to the above-described object, and is an operational effect derived from each configuration shown in the best mode for carrying out the invention described later, and has an operational effect that cannot be obtained by conventional techniques. Can be positioned as one of the purposes.

In order to achieve the above object, the present specification discloses the following “resource allocation control method and base station”.

(1) That is, the resource allocation control method disclosed herein is a communication system in which communication is performed by allocating an amount of resources necessary for communication among the shared resources shared by a plurality of types of calls to the call. In the resource allocation control method in FIG. 1, a predetermined amount of resources are allocated to a first call with a constant resource allocation amount during communication, and a second call whose resource allocation amount may vary during communication A temporary amount of resources is allocated, and resource allocation for a new call is controlled based on the sum of the resource allocation amounts allocated to each of the first and second calls and the total amount of the shared resources.

(2) Here, the provisional amount of resources may be the minimum amount of resources necessary for the second call to maintain a connection, or the second call category or priority depending on the category or priority of the second call. There may be an amount of resources weighted to the minimum required amount.

(3) Further, the control includes a process of monitoring an actual used resource amount actually used for the signal processing of the second call, and a process of updating the sum based on the actual used resource amount;
It is good also as including.

(4) Further, the monitoring of the actual used resource amount is performed periodically, triggered by the occurrence of the new call, or triggered by the release of the call to which the resource has been allocated, or allocated by the second call. It may be carried out when the amount changes.

(5) In addition, the update of the total may be performed when the total exceeds a first threshold value that is smaller than the total amount of the shared resources.

(6) Further, the control includes a process for determining whether the sum exceeds a second threshold value that is larger than the first threshold value and smaller than the total amount of the shared resources, and the determination process. And a process of temporarily limiting the total amount of the shared resources when it is determined that the number is exceeded.
(7) Further, during the restriction, resource allocation may be preferentially performed for calls having a higher priority than the first and second calls.

(8) Further, the restriction may be released when the sum is equal to or less than the second threshold value.

(9) Further, the base station disclosed herein is a base in a communication system in which communication is performed by allocating an amount of resources necessary for communication among the shared resources shared by a plurality of types of calls to the call. For a first call with a fixed resource allocation amount during communication, a fixed amount of resources are allocated, and for a second call whose resource allocation amount may vary during communication, a predetermined temporary amount is allocated. Allocation means for allocating resources, and control means for controlling resource allocation for a new call based on the total amount of resource allocations allocated to each of the first and second calls and the total amount of the shared resources. I have it.

(10) Here, the provisional amount of resources may be the minimum amount of resources necessary for the second call to maintain a connection, or the second call category or priority depending on the category or priority of the second call. There may be an amount of resources weighted to the minimum required amount.

(11) Further, the control means updates the sum total based on the actual used resource amount, a monitoring unit that monitors the actual used resource amount that is actually used for the signal processing of the second call. May be provided.

(12) Further, the monitoring unit may monitor the actual used resource amount periodically, triggered by the occurrence of the new call, triggered by the release of the call to which the resource has been allocated, or the second It may be performed in response to a change in the resource allocation amount of the call.

(13) The updating unit may update the sum when the sum exceeds a first threshold value that is smaller than the total amount of the shared resources.

(14) Further, the control means determines whether or not the sum exceeds a second threshold value that is larger than the first threshold value and smaller than the total amount of the shared resources, and the determination unit And a limiting unit that temporarily limits the total amount of the shared resources when it is determined that the number of shared resources is exceeded.

(15) The control unit may preferentially perform resource allocation for a call having a higher priority than the first and second calls during the restriction by the restriction unit.

(16) Furthermore, the control means may release the restriction by the restriction unit when the sum is equal to or less than the second threshold value.

According to the disclosed technique described above, efficient resource management (allocation) is possible for a plurality of types of calls including a call (second call) in which the amount of resource used varies during communication.

It is a figure which shows an example of the radio | wireless communications system which concerns on one Embodiment of this invention. It is a block diagram which shows the structural example of the wireless base station (BTS) shown in FIG. It is a block diagram which shows the structural example of the call processing function part of BTS shown in FIG. FIG. 4 is a diagram illustrating an example of call reception resource accumulation data used in the call processing function unit illustrated in FIG. 3. It is a figure which shows the example of an image of the actual use resource data used with the call processing function part shown in FIG. FIG. 4 is a flowchart for explaining the operation (call admission determination (resource allocation)) of the BTS shown in FIGS. 1 to 3. FIG. It is a flowchart which shows an example of the subsequence A shown in FIG. It is a flowchart which shows an example of the subsequence B shown in FIG. It is a flowchart which shows an example of the subsequence C shown in FIG. It is a figure which shows the example of an update of the call reception resource accumulation data in the subsequence A shown in FIG. It is a figure which shows the example of an update of the call reception resource accumulation data in the subsequence B shown in FIG. It is a figure which shows the example of an update of call reception resource accumulation data in order to demonstrate the maximum value restriction | limiting process shown in FIG. 8 or FIG.

Explanation of symbols

10. Wireless terminal (user terminal: UE (User Equipment))
20 BTS (Base Transceiver Station)
21 Upper network interface (IF)
22 Radio Function Unit 23 Call Processing Function Unit 231 Input / Output Unit 232 Call Admission Determination Processing Unit 233 Resource Matching Processing Unit 234 Used Resource Collection Processing Unit 235 Call Accepted Resource Accumulation Database 236 Actual Used Resource Database 24 Baseband Function Unit 24-1˜ 24-N Baseband signal processor (shared resource group)
30 core network

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiment described below is merely an example, and there is no intention to exclude various modifications and technical applications that are not explicitly described below. In other words, the present invention can be implemented with various modifications (combining the embodiments, etc.) without departing from the spirit of the present invention.

FIG. 1 is a diagram illustrating an example of a wireless communication system according to an embodiment of the present invention. The radio communication system shown in FIG. 1 includes at least one radio terminal (user terminal: UE (User Equipment)) 10 and at least one radio base station (BTS: Base Transceiver) that can communicate with the UE 10 via a radio link. Station) 20 and a core network 30 such as a public network in which the BTS 20 is accommodated.

Note that the BTS 20 may be communicably connected to the core network 30 via a host network device such as a radio network controller (RNC: Radio Network Controller) (not shown). The UE 10 is connected to the BTS 20 via a wireless link, and can communicate with a communication device such as a server device deployed in another UE 10 or the core network 30 via the BTS 20.

The BTS 20 can be accessed simultaneously by a plurality of UEs 10, and the access calls include a plurality of types of calls such as voice calls, packet calls, and HSUPA calls. The HSUPA call means a call that accesses and communicates using a radio channel defined by HSUPA. The BTS 20 allocates and manages the resources necessary to process these calls from a limited number of shared resources.

Here, the shared resource means, for example, a resource shared by the plurality of types of calls and allocated for signal processing of the call. Therefore, like HSUPA, allocation of radio resources (for example, bandwidth and transmission rate) used for communication in the radio section with UE 10 is adaptively controlled according to the propagation path environment with UE 10 and the availability of shared resources. In the communication to be performed, the amount of resources allocated to call processing according to the control also varies during the communication. Note that, regarding the voice call and the packet call, it is assumed that such a change in the amount of used resources during communication does not occur. That is, in this example, a voice call and a packet call are first calls with a constant resource allocation amount during communication, and an HSUPA call is a second call whose resource allocation amount can vary during communication.

The shared resources that can be allocated by the BTS 20 can be divided into a plurality of shared resource groups, for example, in units of a certain capacity that can be accommodated. In this case, resource allocation and release for each shared resource can be managed by a scheduler for each shared resource, or can be managed by a scheduler common to some or all of each shared resource.

Assuming that the scheduler is provided in the signal processing unit for each shared resource, in the former case, one shared resource can be handled as corresponding to one signal processing unit set (allocated) for call processing. it can. Therefore, resource allocation in that case corresponds to allocation of a certain call processing to any one of the signal processing units (schedulers).

Then, if the number of signal processing units is increased or decreased, the number of calls that can be accommodated (processed) by the BTS 20 (the number of users when the user (UE 10) is different for each call type) can be increased or decreased. The shared resource group may be uniformly the same resource amount, or a part or all of the resource amount may be different.

FIG. 2 shows a configuration example of the BTS 20 of this example. The BTS 20 shown in FIG. 2 includes, for example, an upper network interface (IF) 21, a radio function unit 22, a call processing function unit 23, and a baseband signal processing unit corresponding to a shared resource group (# 1 to #N). (# 1 to #N) 24-1 to 24-N (N is an integer of 2 or more). The baseband signal processor 24-i (where i = 1 to N) constitutes the baseband function unit 24.

Here, the upper network IF 21 has an interface function with the core network 30 (or RNC), and performs data transmission to the core network 30 and data reception from the core network 30.

The wireless function unit 22 includes a wireless interface with the UE 10 and performs communication (transmission / reception) processing using a wireless link. Here, the transmission processing (downlink processing) for the UE 10 includes, for example, DA conversion of transmission data processed by the baseband signal processing unit 24-i, frequency conversion (up-conversion) to a predetermined radio frequency, Processing such as power amplification to the transmission power is included. In addition, the reception process (uplink process) of the signal transmitted by the UE 10 includes, for example, processes such as low noise amplification of the received radio signal, frequency conversion (down conversion) to a baseband signal, and AD conversion.

The baseband signal processing unit 24-i has a transmission baseband processing function for performing error correction coding, framing, data modulation, spread modulation, etc. on the transmission user data signal and various transmission control signals, and also for the receiving user A reception baseband processing function for performing despreading demodulation, data demodulation, deframing, error correction decoding and the like on the data signal and various reception control signals is provided.

The baseband signal processing unit 24-i has a scheduler (not shown) and shared resources for performing various baseband signal processing. As described above, the scheduler performs adaptive resource allocation control (increase / decrease) within a range in which all of the shared resources are not occupied by the best effort type call.

The call processing function unit 23 calls the baseband function unit 24 (shared resource #i) according to the type of call that has occurred (whether it is a voice call, a packet call, or a HSUPA call, etc.). (Resource) is set (allocated) and released.

The type of call that has occurred may be included, for example, in a call setting instruction (control signal) received from an upper network device such as an RNC via the upper network IF 21, or based on a received signal from the UE 10. It is also possible for the call processing function unit 23 to identify autonomously. The resources to be set / released are N shared resources # 1 to #N (baseband signal processing units 24-1 to 24-N) for the purpose of effective use and load distribution, such as round robin. Determined by algorithm.

However, the call processing function unit (allocation means) 23 of this example allocates a fixed amount (fixed) of resources for calls (for example, voice calls and packet calls) in which the amount of used resources (resource allocation amount) during communication is constant. For HSUPA calls in which the amount of used resources can vary during allocation and communication, a temporary (provisional) temporary used resource amount (resource allocated amount) is allocated and managed. This makes it possible for HSUPA calls to handle call processing (resource setting / release and management) as well as calls with a fixed amount of resources during communication such as voice calls and packet calls.

As an example of a provisional resource determination (calculation) method, for example, a method of uniformly setting a minimum value for HSUPA calls (a minimum resource amount necessary for maintaining a connection through a wireless channel of HSUPA) And a method of weighting the minimum value according to a category for each HSUPA call, a priority, and the like.

Then, the call processing function unit (control means) 23 sums up the resource allocation amount of the voice call, packet call, and HSUPA call, and the total amount (maximum value) of the allocatable resource amount for each shared resource #i (in other words, , The reception (resource allocation) of a newly generated call is controlled based on the unused resource amount for each shared resource #i.

For example, the call processing function unit 23 may use the tentative usage resource at a certain timing after the call is accepted (when a call is set up or released, a periodic timing, a timing when the amount of HSUPA call usage varies, etc.). The amount of resources and the amount of resources actually used for call processing (actually used resource amount) are collated, while the provisional used resource amount is updated, the acceptance decision of the newly generated call is made and accepted Perform resource allocation for calls that are determined to be acceptable.

Therefore, for example, as shown in FIG. 3, the call processing function unit 23 of this example includes an input / output unit 231, a call admission determination processing unit 232, a resource matching processing unit 233, a used resource collection processing unit 234, A reception resource accumulation database 235 and an actual use resource database 236 are provided.

Here, the input / output unit 231 has a communication interface function between the call processing function unit 23 and the outside (the host network IF 21 and the baseband signal processing unit 24-i).

The call reception resource accumulation database 235 includes, for each shared resource #i, a total (resource allocation) of resources used by the call received by the call reception determination processing unit 232 in the past (including the provisional resource used for the HSUPA call). Data (call reception resource accumulation data (hereinafter sometimes referred to as “data A”)) is held.

For example, in the example shown in FIG. 4, “voice call # 1” and “packet call # 1” are set in the shared resource # 1 (baseband signal processing unit # 1), which is necessary for each call processing. The shaded portion obtained by accumulating (adding) the resource amount represents the total amount of resources in use (allocated).

Note that X and Y shown in FIG. 4 (where Y <X, and X <total amount of shared resources #i that can be allocated (maximum value: MAX)) are both threshold values related to the amount of resources used. As will be described later, the threshold (first threshold) Y has significance as an opportunity (condition) for updating the data A with the following actual use resource data, and the threshold (second threshold) X is an emergency call. Or the priority call, it is meaningful as a trigger (condition) for limiting the maximum value of the resource amount that can be used (allocated) by the scheduler. The emergency call is a call (voice call) such as 110 call or 119 call. The priority call may be a voice call, a packet call, or an HSUPA call, and is a call that has a higher priority than other calls.

The actual use resource database 236 stores, for each shared resource #i (baseband signal processing unit 24-i), data indicating the sum of resources actually used during communication by calls accepted in the past (actual use resource data). (Hereinafter may be referred to as “data B”).

For example, in the example shown in FIG. 5, “voice call # 2”, “packet call # 2”, and “HSUPA call # 1” are set in the shared resource # 1 (baseband signal processing unit 24-1). The shaded portion represents the amount of resources actually used in the shared resource # 1 (baseband signal processing unit 24-1) for processing each call.

This actual use resource data is, for example, each shared resource #i (at a certain time interval (period), a change point of the resource usage of the best effort type call, a call setup and / or release timing, etc. Information on the resource usage status is collected from the baseband signal processing unit 24-i) by in-house communication or the like, and is used to collate with the call reception resource accumulation data and update the data.

In this example, the used resource collection processing unit 234 performs the collection. That is, the used resource collection processing unit 234 of this example serves as a monitoring unit that monitors the actual used resource amount actually used (occupied) in the signal processing of the HSUPA call, which is a best effort type call, The monitoring can be performed, for example, periodically, when a new call is generated, or when a resource-allocated call is released.

The call admission determination processing unit 232 determines whether it is possible to accept a newly generated call (allocate resources) based on the data A held and managed in the call admission resource accumulation database 235. It is. For example, the call admission determination processing unit 232 is more likely to accept a newly generated call as the unused resource amount of the shared resource #i has a margin.

The resource collation processing unit (update unit) 233 is a specific resource that can be determined that there is no room for the unused resource amount in a certain shared resource #i (baseband signal processing unit 24-i) at the time when the call setting is received. When the condition is satisfied, the data A and the data B are collated, and the data A used for the call admission judgment processing in the call admission judgment processing unit 232 is updated with the latest data B. .

The specific condition is, for example, when the total amount of used resources represented by the data A exceeds the threshold Y. With this update, the call admission determination processing unit 232 can perform admission determination for a newly generated call based on the actual used resource amount (that is, the actual unused resource amount) in the shared resource #i. It becomes possible.

It should be noted that data A and data B are collated (update of data A by data B) at the time of call release, the collection timing of the data B [a certain time interval (cycle), and best-effort call resources. It is also possible to carry out at the point of change in the amount used, etc.].

(Description of operation)
In the BTS 20 (call processing function unit 23) of the present example configured as described above, in the call setting reception process with a constant amount of resources used during a call such as a voice call or a packet call, the sharing shown in FIG. Data A for each resource #i (baseband signal processing unit 24-i) is searched to determine a shared resource #i (baseband signal processing unit 24-i) that can be set up by the data B shown in FIG. Update to data A and call setting to the determined shared resource #i (baseband signal processing unit 24-i) are performed.

Also for the HSUPA call, the BTS 20 (call processing function unit 23) treats the use resource amount of the HSUPA call as a temporary provisional use resource amount, so that the call use such as a voice call or a packet call is continued. Resource management (allocation) can be performed in the same way as a call with a fixed resource amount.

Note that even when a call cannot be set for a certain shared resource #i (baseband signal processing unit 24-i) as a resource setting destination candidate, another shared resource #j (baseband signal processing unit 24) capable of setting a call -J: If j ≠ i) in any of j = 1 to N, the call is accepted and call setting is performed for the shared resource #j.

Hereinafter, a more detailed operation of the BTS 20 (call acceptance determination (resource allocation)) will be described in detail with reference to FIGS.

As shown in FIG. 6, when the call processing function unit 23 receives a call setting request for a newly generated call, the BTS 20 is configured to share resources that can be set by the call admission determination processing unit 232. #I is determined and determined based on the data A of the call reception resource accumulation database 235 (process 1001).

That is, the call admission determination processing unit 232 first determines the type of a call that has newly occurred (voice call, packet call, emergency call, priority call, HSUPA call) (process 1002), and then calls a voice call, packet call, or emergency call. If it is a call or a priority call, the amount of resources required to process each call is calculated (processes 1003 and 1004). On the other hand, when the newly generated call is an HSUPA call, the call admission determination processing unit 232 calculates the resource amount necessary to process the HSUPA call as a predetermined temporary temporary resource amount. (Process 1005).

Then, the call admission determination processing unit 232 compares the current use resource amount a with the threshold values X and Y with reference to the data A, and whether the relationship is a ≦ Y or Y <a ≦ X. Or a> X is determined (processing 1006).

As a result, if a ≦ Y, the subsequence A shown in FIG. 7 is performed. If Y <a ≦ X, the subsequence B shown in FIG. 8 is used. If a> X, the subsequence C shown in FIG. The call admission determination processing unit 232 performs each (processing 1007, 1008, 1009).

(When a ≦ Y)
First, sub-sequence A in the case of a ≦ Y will be described. As shown in FIG. 7, the call admission determination processing unit 232 sets the target (setting destination) shared resource #i determined by the round robin or the like. It is determined that there is room in unused resources, the call is allowed to be accepted, and the calculated used resource amount is added to the data A as the resource amount necessary for the processing of the call and updated (processing 1071). The resource to be used is set for the baseband signal processing unit 24-i corresponding to the shared resource #i (processing 1072).

For example, as shown in (1) of FIG. 10, “voice call # 1”, “packet call # 1”, and “HSUPA call # 1” are newly set up in the shared resource #i. When the call is the HSUPA call # 2, the call admission determination processing unit 232 adds the used resource amount calculated for the HSUPA call # 2 to the data A and updates as shown in (2) of FIG. .

(When Y <a ≦ X)
On the other hand, in the subsequence B in the case where the current used resource amount a is Y <a ≦ X, the call admission determination processing unit 232 sends data to the resource collation processing unit 233 as shown in FIG. The resource collation processing unit 233 that has requested the collation between A and data B collates the data A and the data B, and updates the data A with the data B if there is a mismatch (process 1081). .
For example, data A is in the state shown in (1) of FIG. 11 and data B is in the state shown in (2) of FIG. 11 (the actual amount of resources used in HSUPA call # 1 increases) 11), the data A shown in (1) of FIG. 11 is updated with the data B shown in (2) of FIG.

Then, the call admission determination processing unit 232 determines whether or not the newly generated call can be accepted (resource setting) based on the updated data A (processing 1082).

As a result, if it is determined that the unused resource amount of the shared resource #i is still sufficient and can be accepted, the call admission determination processing unit 232 allows the call to be accepted and the resources necessary for the processing of the call The calculated used resource amount is added to the data A and updated as the amount (from the Yes route of the processing 1082 to the processing 1083), and the baseband signal processing unit 24-i corresponding to the shared resource #i Setting is performed (processing 1084).

For example, if the newly generated call is HSUPA call # 3, the call admission determination processing unit 232 uses the amount of used resources calculated for the HSUPA call # 3 as data A as shown in (3) of FIG. Add to and update.

Then, the call admission determination processing unit (determination unit) 232 checks whether or not the used resource amount in the data A exceeds the threshold value X by the setting (processing 1085). In other words, in this case, a resource amount obtained by adding the amount of used resources for a new call to data A after updating data A with data B is used.

As a result of this determination, if the used resource amount exceeds the threshold value X, the call admission determination processing unit (restriction unit) 232 uses the scheduler of the target shared resource #i (baseband signal processing unit 24-i). Processing for temporarily limiting (decreasing) the maximum value of the resource amount is performed (from the Yes route of processing 1085 to processing 1086). If not exceeded, the call admission judgment processing unit 232 finishes the process (No route of the process 1085). Details of the maximum value limiting process will be described later.

On the other hand, when it is determined in the process 1082 that the unused resource amount of the shared resource #i has no margin and the call cannot be accepted (No in process 1082), the call admission determination processing unit 232 6 can perform resource setting for the process after process 1006 in FIG. 6 in order to confirm whether or not the call resource can be set for another shared resource #j (j ≠ i in any of j = 1 to N). The process is repeated until a new shared resource #j is found (from the No route of process 1087 to process 1088).

As a result, if there is no shared resource #j that can be set, the call admission determination processing unit 232 determines that call setting is impossible, and ends the processing (from the Yes route of the processing 1087 to the processing 1089). In this case, a call loss occurs for the call.

(When a> X)
Next, sub-sequence C when the current used resource amount a is a> X will be described. As shown in FIG. 9, the call admission determination processing unit 232, as in the case of Y <a ≦ X, The resource collation processing unit 233 is requested to collate the data A and the data B, and the resource collation processing unit 233 that has received the request collates the data A and the data B. Data A is updated (processing 1091).

Then, the call admission determination processing unit 232 checks whether the newly generated call type is an emergency call or a priority call (process 1092), and if it is an emergency call or a priority call, accepts the call. The calculated used resource amount is added to the data A as the resource amount necessary for the processing of the call and updated (from the Yes route of the processing 1092 to the processing 1093), and the baseband signal processing unit 24 corresponding to the shared resource #i is updated. A resource to be used is set for -i (process 1094).

On the other hand, when the newly generated call type is a general call other than an emergency call or a priority call, the call admission determination processing unit (restriction unit) 232 sets the target shared resource #i (baseband signal processing unit 24- For the scheduler of i), the maximum resource amount limit processing is performed (from the No route of the processing 1092 to the processing 1095).

Then, the call admission determination processing unit 232 performs processing after the processing 1006 in FIG. 6 to check whether it is possible to set the resource of the general call for another shared resource #j. Is repeated until it is discovered (from the No route of process 1096 to process 1097).

As a result, if there is no other shared resource #j that can be set, the call admission determination processing unit 232 determines that call setting is impossible and ends the processing (from the Yes route of the processing 1096 to the processing 1098). In this case, a call loss occurs for the general call.

That is, when the amount of used resources of data A is a> X, the call admission determination processing unit (control unit) 232 uses the remaining unused resources while the maximum value restriction process is not released (during restriction). As a preferential assignment to priority calls and emergency calls such as call 110, general calls with low priority are not accepted (resource assignment).

(Maximum value limit processing)
In the process 1086 of FIG. 8 or the process 1095 of FIG. 9, the call admission determination processing unit 232 controls the scheduler of the target baseband signal processing unit 24-i to reduce the maximum value of the available resource amount.

Since the scheduler increases / decreases the amount of used resources within a range not exceeding the specified maximum value, for example, as shown in FIG. 12, it is possible to secure unused resources that are not managed by the scheduler by limiting the maximum value. become. In this state, only priority calls and emergency calls can be accepted, so that priority calls and emergency calls can be accepted even near the processing capacity limit of the baseband signal processing unit 24-i.

(Maximum value restriction release processing)
When either of the following conditions (1) and (2) is satisfied during the execution of the maximum value limiting process, the call admission determination processing unit 232 cancels the maximum value limiting process for the scheduler.

(1) When the used resource amount a managed by the data A for the shared resource #i (baseband signal processing unit 24-i) to be released at the time of call release becomes a <X by the call release

(2) When the resource collation processing unit 233 collates the data A and the data B when the call is released or periodically, and the actual used resource amount b managed by the data B satisfies b <X. Through the processing, it is possible to accept general calls other than emergency calls and priority calls.

As described above, according to the BTS of this example, a provisional (simple) provisional resource amount can be assigned to a call such as an HSUPA call whose use resource amount fluctuates during communication. Even when a call with a fixed amount of used resources is mixed with a call that fluctuates, resource management (call setting acceptance / rejection, determination of allocation destination resource, resource relocation) can be performed efficiently, and shared resource # i can be used effectively.

Therefore, for example, the amount of used resources of the HSUPA call is greatly increased by adaptively controlling according to the amount of unused resources, the propagation path environment between the UE 10 and the like, and the communication system (radio base station) Even when the number of calls that can be accommodated is within the range, it is possible to avoid a situation (occurrence of call loss) that prevents new call setting (acceptance) from being performed.

In addition, when the amount of resources that can be allocated is insufficient (when the total amount of used resources represented by the data A exceeds the threshold Y), the data A is appropriately updated with the actual used resource amount (data B). Since it is possible to determine whether or not to accept a new call, even when the resource allocation amount for the HSUPA call varies with time, it is possible to perform an appropriate admission determination according to the variation.

Furthermore, when the amount of resources that can be allocated is almost exhausted (when the total amount of used resources represented by data A exceeds the threshold value X), the scheduler limits the maximum value of the amount of resources that can be allocated to general calls. Therefore, it is possible to accept emergency calls and priority calls even near the capacity limit of accommodation (processing), and it is possible to reduce the call loss occurrence rate of emergency calls and priority calls.

Claims (16)

A resource allocation control method in a communication system for performing communication by allocating a required amount of resources for communication from among shared resources shared by a plurality of types of calls,
For a first call with a constant resource allocation amount during communication, a predetermined amount of resource is allocated, and for a second call whose resource allocation amount may vary during communication, a predetermined provisional amount of resource is allocated,
Control resource allocation for a new call based on a total resource allocation amount allocated to each of the first and second calls and a total amount of the shared resources;
A resource allocation control method. The provisional amount of resources may be the minimum amount of resources required for the second call to maintain a connection, or the minimum required amount depending on the category or priority of the second call. The resource allocation control method according to claim 1, characterized in that the amount of resources is weighted to each other. The control is
A process of monitoring an actual amount of resources actually used for signal processing of the second call;
Processing to update the sum based on the actual resource usage amount;
The resource allocation control method according to claim 1 or 2, characterized by comprising: The monitoring of the actual used resource amount is performed periodically, triggered by the occurrence of the new call, triggered by the release of a call to which resources have already been allocated, or triggered by a change in the resource allocated amount of the second call. The resource allocation control method according to claim 3, wherein the resource allocation control method is implemented. 5. The resource allocation control method according to claim 3, wherein the updating of the sum is performed when the sum exceeds a first threshold value that is smaller than a total amount of the shared resources. The control is
A process for determining whether the sum exceeds a second threshold value that is greater than the first threshold value and less than the total amount of the shared resources;
A process of temporarily limiting the total amount of the shared resources when it is determined that the determination is exceeded,
The resource allocation control method according to claim 5, comprising: The resource allocation control method according to claim 6, wherein during the restriction, resource allocation is preferentially performed for a call having a higher priority than the first and second calls. The resource allocation control method according to claim 6 or 7, wherein the restriction is released when the sum becomes equal to or less than the second threshold value. A base station in a communication system that performs communication by allocating a necessary amount of resources to perform communication from among shared resources shared by a plurality of types of calls,
Allocation means for allocating a certain amount of resources for a first call with a constant resource allocation amount during communication, and allocating a predetermined provisional amount of resources for a second call whose resource allocation amount may vary during communication When,
Control means for controlling resource allocation for a new call based on a sum of resource allocation amounts allocated to each of the first and second calls and a total amount of the shared resources;
A base station characterized by having The provisional amount of resources may be the minimum amount of resources required for the second call to maintain a connection, or the minimum required amount depending on the category or priority of the second call. Base station according to claim 9, characterized in that it is a weighted amount of resources. The control means includes
A monitoring unit for monitoring the amount of actually used resources actually used for signal processing of the second call;
An update unit that updates the total based on the actual resource usage amount;
The base station according to claim 9 or 10, characterized by comprising: The monitoring unit
Monitoring of the actual used resource amount periodically, triggered by the occurrence of the new call, triggered by the release of a call to which resources have already been allocated, or triggered by a change in the resource allocated amount of the second call The base station according to claim 11, wherein the base station is implemented. The update unit
The base station according to claim 11 or 12, wherein the update of the sum is performed when the sum exceeds a first threshold value that is smaller than a total amount of the shared resources. The control means includes
A determination unit that determines whether or not the sum exceeds a second threshold value that is larger than the first threshold value and smaller than the total amount of the shared resources;
A limiting unit that temporarily limits the total amount of the shared resource when it is determined that the determination unit exceeds the limit,
14. The base station according to claim 13, characterized by comprising: The control means includes
The base station according to claim 14, wherein, during the restriction by the restriction unit, resource allocation is preferentially performed for a call having a higher priority than the first and second calls. The control means includes
The base station according to claim 14 or 15, wherein the restriction by the restriction unit is canceled when the sum is equal to or less than the second threshold value.

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