Wireless communication system, communication control apparatus, communication terminal apparatus, and control program of communication control apparatus

• US 9,301,260 B2
• Filed: 08/20/2010
• Issued: 03/29/2016
• Est. Priority Date: 09/18/2009
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Goto, Jungo, Hamaguchi, Yasuhiro, Yokomakura, Kazunari, Nakamura, Osamu, Takahashi, Hiroki
• Primary Examiner(s): TRAN, PHUC H
• Application Number:
  US13/496,809
• Publication Number:
  US 20120218961A1
• Time in Patent Office: 2,048 Days
• Field of Search: 370/311, 370/329, 370 22-238
• US Class Current: 1/1
• CPC Class Codes: H04B 17/382 for resource allocation, admission control or handover
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/247 where the output power of a terminal is based on a path parameter sent by another terminal
• CPC Class Codes: H04W 52/26 using transmission rate or quality of service QoS [Quality of Service]
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA

Abstract

To perform control so as to achieve a transmission power that satisfies a desired communication quality by an access method which a mobile station apparatus uses, in consideration of the frequency-selective diversity effect, when switching an access method to the one having a different frequency-selective diversity effect. In a wireless communication system in which a communication control apparatus and a communication terminal apparatus that are able to use a plurality of types of access methods perform wireless communication using any of the access methods, the communication control apparatus, when the necessity of changing the access method arises, determines the access method after change and notifies the communication terminal apparatus of switching the access method before change to the determined access method, and performs the transmission power control in accordance with communication characteristics of the determined access method.

Claims

1. A wireless communication system comprising:

a control apparatus; and

a communication terminal apparatus, wherein

the communication terminal apparatus is configured to;

receive, from the control apparatus, control information indicating an access method for transmitting data, wherein the control information is information indicating one of a first access method and a second access method, wherein the first access method allocates a plurality of subcarriers continuously to form a single cluster of subcarriers and the second access method non-continuously allocates the plurality of subcarriers in at least a first cluster and a second cluster, wherein the first cluster includes a first portion of the plurality of subcarriers continuously allocated to form the first cluster and the second cluster includes a second portion of the plurality of subcarriers continuously allocated to form the second cluster;

modify a transmission power for transmitting the data by using a value, wherein the value is calculated by dividing the first number of resource blocks which the communication terminal apparatus uses for transmitting the data by the second number of resource blocks which the control apparatus can allocate, wherein the transmission power is modified so that the transmission power decreases in case in which the first number of resource blocks is decreased, if the second number of resource blocks is a fixed value; and

transmit the data using the transmission power modified to the control apparatus, and

the control apparatus is configured to;

receive the data from the communication terminal apparatus.

2. A communication terminal apparatus comprising:

a receive part configured to receive, from a control apparatus, control information indicating an access method for transmitting data, wherein the control information is information indicating one of a first access method and a second access method, wherein the first access method allocates a plurality of subcarriers continuously to form a single cluster of subcarriers and the second access method non-continuously allocates the plurality of subcarriers in at least a first cluster and a second cluster, wherein the first cluster includes a first portion of the plurality of subcarriers continuously allocated to form the first cluster and the second cluster includes a second portion of the plurality of subcarriers continuously allocated to form the second cluster;

a control part configured to modify a transmission power for transmitting the data by using a value, wherein the value is calculated by dividing a first number of resource blocks which the communication terminal apparatus uses for transmitting the data by a second number of resource blocks which the control apparatus can allocate, wherein the transmission power is modified so that the transmission power decreases in case in which the first number of resource blocks is decreased, if the second number of resource blocks is a fixed value; and

a transmit part configured to transmit the data using the transmission power modified to the control apparatus.

transmitting the data using the transmission power modified to the control apparatus.

3. The communication terminal apparatus according to claim 2, wherein

the control part is configured to modify the transmission power by performing open loop TPC (Transmit Power Control).

4. A non-transitory computer-readable medium having instructions stored thereon, such that when the instructions are read and executed by a processor, the processor is configured to perform the steps of:

receiving, from a control apparatus, control information indicating an access method for transmitting data, wherein the control information is information indicating one of a first access method and a second access method, wherein the first access method allocates a plurality of subcarriers continuously to form a single cluster of subcarriers and the second access method non-continuously allocates the plurality of subcarriers in at least a first cluster and a second cluster, wherein the first cluster includes a first portion of the plurality of subcarriers continuously allocated to form the first cluster and the second cluster includes a second portion of the plurality of subcarriers continuously allocated to form the second cluster;

modifying a transmission power for transmitting the data by using a value, wherein the value is calculated by dividing a first number of resource blocks which the communication terminal apparatus uses for transmitting the data by a second number of resource blocks which the control apparatus can allocate, wherein the transmission power is modified so that the transmission power decreases in case in which the first number of resource blocks is decreased, if the second number of resource blocks is a fixed value; and

transmitting the data using the transmission power modified to the control apparatus.

5. A modifying method of a transmission power for transmitting data comprising:

receiving, from a control apparatus, control information indicating an access method for transmitting the data, wherein the control information is information indicating one of a first access method and a second access method, wherein the first access method allocates a plurality of subcarriers continuously to form a single cluster of subcarriers and the second access method non-continuously allocates the plurality of subcarriers in at least a first cluster and a second cluster, wherein the first cluster includes a first portion of the plurality of subcarriers continuously allocated to form the first cluster and the second cluster includes a second portion of the plurality of subcarriers continuously allocated to form the second cluster;

modifying the transmission power for transmitting the data by using a value, wherein the value is calculated by dividing the first number of resource blocks which a communication terminal apparatus uses for transmitting the data by the second number of resource blocks which the control apparatus can allocate, wherein the transmission power is modified so that the transmission power decreases in case in which the first number of resource blocks is decreased, if the second number of resource blocks is a fixed value; and

transmitting the data using the transmission power modified to the control apparatus.