JP3539224B2 - Communication bandwidth control method - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a communication band control method performed for one communication device to communicate with a plurality of communication devices. In particular, in a wireless communication system having a wireless base station and a plurality of wireless terminals, it is a method of centralized management control of wireless resources performed by the wireless base station, and flexibly allocates or releases a wireless channel according to a user request. The present invention relates to a technology for implementing and improving the efficiency of processing.
[0002]
Problems to be solved by the prior art and the invention
2. Description of the Related Art In recent years, multimedia services have attracted attention in access-type wireless communication. In particular, in a wireless communication system, the frequency utilization efficiency is improved by providing a transmission path capable of changing the transmission rate according to the service content. For example, in the time division multiple access scheme, the number of channels assigned to one user can be changed according to the transmission speed.
[0003]
In such a radio access system, there is a conventional circuit switching-based channel control method that allocates a fixed communication band when a new call is generated. This is a method of performing communication band allocation processing at the time of calling and performing communication in a fixed band until disconnection.
[0004]
However, the fixed communication band allocating method has a problem in that when the user information rate that is not suitable for traffic in which the user information rate changes drastically decreases, the band used is smaller than the band initially allocated, so that the frequency is effective. May not be available. On the other hand, when the user information rate increases, the communication band becomes insufficient, and thus the utilization efficiency of the radio resources decreases. Therefore, the method has a disadvantage that radio resources are excessively used for a change in the user information rate.
[0005]
On the other hand, it has been proposed to change the allocation of the communication band when the user information rate changes. However, since the allocation of the communication band is affected by the fluctuation of the user information rate, when the user information rate changes drastically, the processing load for changing the communication band in the radio base station becomes heavy. Further, when allocating a communication band according to an allocation request, it is difficult to predict a traffic change related to another wireless terminal, so it is difficult to determine how much to add or reduce a communication band, and effective use of wireless resources is difficult. It will be difficult.
[0006]
FIG. 1 is a flowchart of a conventional communication band allocation method in a wireless base station. This is a method in which the amount of transmission data is measured by the wireless terminal side, the measurement value is periodically transmitted to the wireless base station side, and the wireless base station side performs allocation processing as needed.
[0007]
First, a message notifying the transmission data amount t is received from the wireless terminal. Next, let R be the communication band currently used. Next, when the communication band R is different from the transmission data amount t requested by the wireless terminal, the communication band is allocated or released. If R = t, no processing is performed.
[0008]
However, in the method of FIG. 1, it is necessary to always transmit a control message for notifying the amount of transmission data, regardless of a change in the user information rate, and a useless control message is transmitted.
[0009]
FIG. 2 is a flowchart of a conventional communication band release method in a wireless base station. This is a method of releasing radio resources when user data is not received for a certain period of time.
[0010]
First, wait until data is received. Next, after the data is received once, it is in a waiting state until a certain number of times i are counted. When new data is received, the count i = 0 is started again from the beginning. When the counter i reaches N, the communication band is released. N is a cycle for determining a certain time.
[0011]
However, in the method of FIG. 2, it is necessary to confirm that there is no user data for a certain period of time in order to release the communication band. In order to accurately control the communication band, it is necessary to lengthen the certain time for confirmation to some extent. Accordingly, a delay occurs in releasing the radio resource, and the utilization efficiency of the radio resource is reduced. If possible, it is desirable to release the radio resources immediately when the radio resources become unnecessary.
[0012]
FIG. 3 is a flowchart of a conventional communication band allocation method in a wireless terminal. This describes the processing of the wireless terminal in response to the communication band assignment message from the wireless base station.
[0013]
First, the wireless terminal receives a communication band assignment message from the wireless base station. Next, a response to the assignment message is transmitted to the radio base station. At this time, even if the transmission data is still stored in the transmission buffer or the like of the wireless terminal even if the content of the allocation message is included, an allocation request message is transmitted to the wireless base station.
[0014]
However, in the method shown in FIG. 3, if there is a simultaneous transmission request between the wireless base station and the wireless terminal, the allocation processing is performed separately, and one of them waits for the processing. This results in increased processing delay and reduced transmission throughput.
[0015]
Further, in the conventional communication band control method as described above, no consideration is given to a communication band used by a wireless terminal other than the wireless terminal to be allocated. That is, the allocation process is performed only on the whole unused radio resources. For this reason, radio resources cannot be allocated in consideration of the communication state of other radio terminals, and it is difficult to control the radio resources so that the throughput of the entire radio terminal providing the service is improved. It becomes.
[0016]
Accordingly, an object of the present invention is to provide a communication band control method having means for solving the above-mentioned problems. As a result, it is not necessary to transmit useless control messages for controlling the communication band, the communication band can be released as soon as possible, and there is no delay for controlling the communication band, thereby improving the transmission efficiency. I do.
[0017]
[Means for Solving the Problems]
The communication band control method according to the present invention includes a step of determining whether or not a first communication device needs to periodically allocate / release a communication band; Transmitting an allocation / release message to the second communication device only when the allocation / release is required; and responding to the allocation / release message transmitted from the first communication device by the second communication device. When transmitting a message, it is determined whether or not allocation / release needs to be performed also in the second communication device, and if it is necessary to transmit an allocation / release message, the second communication device determines the response and the content of the allocation / release. Transmitting the composed message to the first communication device. Thus, the necessity of allocation / release of the communication band is confirmed in a short cycle, and the allocation / release processing is performed only when it is necessary, so that wireless resources are not wasted for a long time. Normally, when the user information rate is changed simultaneously between the wireless base station and the wireless terminal, if the processing is performed one by one, the processing delay increases, and as a result, the throughput decreases. The present invention reduces the processing delay by devising so that the messages used for allocation / release can be transmitted at the same time so that the processing delay does not increase in such a case. In addition, when the communication band is changed, the priority of communication is determined from the communication state of the other terminals that are providing the service, and control is performed in accordance with the priority to effectively use wireless resources.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0022]
FIG. 4 is a flowchart of the communication band allocation method of the present invention in the radio base station. This is shown for the allocation process in one cycle. N is a cycle for determining whether or not there is a need for allocation processing, and i is a counter for confirming the cycle N. For example, when the time division multiplexing method is adopted, i can be set to one frame unit.
[0023]
In FIG. 4, first, a predetermined cycle is counted. Next, it is determined whether it is necessary to allocate a communication band. The judgment factors here are as follows: (1) The wireless base station receives from the wireless terminal an increase in the amount of transmission data or receives a control message of a transmission request; (3) It is determined whether an allocation request has been made by confirming the occurrence of a new call or connection. As a result, the communication band is allocated only when the communication band needs to be allocated.
[0024]
FIG. 5 is a flowchart of the communication band releasing method of the present invention in the radio base station. This is shown for the allocation processing within one cycle, as in FIG. N is a cycle for determining whether or not the release processing is necessary, and i is a counter for checking the cycle N. It is also preferable to process N and i as the same as those at the time of assignment shown in FIG.
[0025]
In FIG. 5, first, a predetermined cycle is counted. Next, it is determined whether it is necessary to release the communication band. The determination factors include: (1) the wireless base station receives a control message of a transmission data reduction or transmission request from the wireless terminal; (2) a decrease in the storage amount of the transmission buffer in the wireless base station; ▼ By confirming a call or connection disconnection, etc., it is determined whether release processing is necessary. Thus, the communication band release processing is performed only when the communication band needs to be released.
[0026]
FIG. 6 is a flowchart of the message transmission of the present invention in the radio base station.
[0027]
First, the radio base station starts an allocation process and transmits an allocation message for notifying a channel to be used to the radio terminal. Thereafter, a message received from the wireless terminal is determined. Here, the message includes an assignment request message and a response to the assignment message transmitted by the radio base station. In the present invention, both messages can be included in one message. Therefore, the messages here include a message including only the assignment request, a message including only the response to the assignment message, and a message including both the assignment request and the response.
[0028]
If a message including only the assignment request is received before the response is received, the assignment process is started while maintaining a state of waiting for the response. When a message containing only a response is received, communication using the allocated communication channel is started. Further, when the message of the assignment request + response is received, communication using the communication channel assigned according to the content of the response is started, and at the same time, the assignment process for the assignment request is started again.
[0029]
FIG. 7 is a configuration diagram of a message transmitted from a wireless terminal according to the present invention. The message includes an assignment request message and a response to the assignment message transmitted by the radio base station in one message. This either combines both messages into one, or uses what is defined as a new message.
[0030]
FIG. 8 is a flowchart of the message transmission of the wireless terminal of the present invention with respect to the processing of the wireless base station in FIG.
[0031]
First, the wireless terminal receives the assignment message and starts transmission processing of the response. Next, it is determined whether it is necessary to make an allocation request. The determination factor here is performed by confirming the state of a buffer for storing transmission data of the wireless terminal or a request for establishing a new connection. Based on this determination, if there is an allocation request, a message of response + allocation request is transmitted, and if there is no allocation request, a message of only response is transmitted.
[0032]
The foregoing has described one embodiment in a wireless communication system. However, various changes, modifications, and omissions of the scope of the technical idea and viewpoint of the present invention can be easily performed by those skilled in the art. The above description is merely an example and does not limit the present invention. For example, even in a wired communication system stretched like a net such as the Internet, the required amount and the allocated amount can be considered as the number of link connections. Accordingly, the invention is limited only as defined by the appended claims and equivalents thereof.
[0033]
【The invention's effect】
FIG. 9 is a graph illustrating the difference between the effects of the conventional fixed communication band allocation method and the communication band control method according to the present invention. The conventional fixed communication band allocation method is represented by a broken line. In this method, when the user information rate changes, the result is that radio resources are additionally allocated, and radio resource utilization efficiency is reduced. On the other hand, the communication band control method according to the present invention is represented by a solid line and changes gradually according to the transmission request amount. In this method, control for dynamically allocating a communication band according to a user information rate or a generated data rate is performed, so that radio resources can be effectively used.
[0034]
Further, since the present invention refers to the user information rate periodically, it is possible to prevent the processing load from becoming abnormally heavy when the rate changes drastically, and to wirelessly communicate with a plurality of wireless terminals. The allocation process can be performed in consideration of the priority of resource allocation. Therefore, it is possible to improve the serviceability so as to achieve a fair throughput for all wireless terminals without reducing or increasing the throughput of a specific wireless terminal.
[0035]
Furthermore, in order to shorten the processing procedure, in the present invention, messages can be transmitted at the same time for processing that occurs at the same time, so that processing delay can be reduced, throughput can be improved, and radio resource utilization efficiency can be improved. .
[Brief description of the drawings]
FIG. 1 is a flowchart of a conventional communication band allocation method in a radio base station.
FIG. 2 is a flowchart of a conventional communication band release method in a wireless base station.
FIG. 3 is a flowchart of a conventional communication band allocation method in a wireless terminal.
FIG. 4 is a flowchart of a communication band allocation method according to the present invention in a radio base station.
FIG. 5 is a flowchart of a communication band release method according to the present invention in a radio base station.
FIG. 6 is a flowchart of message transmission according to the present invention in a radio base station.
FIG. 7 is a configuration diagram of a message according to the present invention.
FIG. 8 is a flowchart of message transmission by the wireless terminal to the wireless base station of FIG. 6 according to the present invention;
FIG. 9 is a graph of user information rate and time for comparing the effects of the conventional method and the method of the present invention.

Claims (1)

In a communication band control method performed for a first communication device to communicate with a plurality of second communication devices,
The first communication device periodically determining whether it is necessary to allocate / release a communication band;
Transmitting the allocation / release message to the second communication device only when the first communication device needs to allocate / release the communication band;
When the second communication device transmits a response message to the allocation / release message transmitted from the first communication device, does the second communication device need to perform allocation / release also? Deciding whether or not to transmit an allocation / release message, and transmitting a message composed of the response and the content of the allocation / release to the first communication device when it is necessary to transmit the allocation / release message. Bandwidth control method.

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