Wireless channel setting method for mobile communication system and mobile communication control apparatus

• US 7,088,960 B2
• Filed: 06/23/2003
• Issued: 08/08/2006
• Est. Priority Date: 06/24/2002
• Status: Expired due to Fees

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Ueda, Shinji, Nakamura, Takehiro, Kato, Yasuhiro, Onoe, Seizo, Ohto, Yutaka, Maebara, Akihiro
• Primary Examiner(s): Gesesse, Tilahun
• Application Number:
  US10/600,329
• Publication Number:
  US 20040005898A1
• Time in Patent Office: 1,142 Days
• Field of Search: 455/442, 455/452, 455/439, 455/453, 455/522, 455/67.11, 455/26.1, 455/69, 455/115.3, 455/226.3, 455/127.1, 455/67.13, 455/277.2
• US Class Current: 455/69
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 36/06 Reselecting a communication resource in the serving access point

Abstract

Disclosed is a mobile communication system whereby, to reduce the connection time, a mobile station closely located to a base wireless station is permitted to continue to use a common channel for exchanging signals, and to suppress an increase in interference, an individual channel is set for a mobile station located near the edge of a cell, and to obtain a stabilized communication quality and to prevent an increase in the connection time, the probability that the transmission power will reach an upper limit is reduced. When communication between a mobile station and a wireless base station is started, the wireless base station measures the transmission power and the communication quality in the communication with the mobile station and the utilization ratio for a common channel, and compares the obtained values with predetermined threshold values. When the obtained values are lower than the threshold values, the wireless base station continues to use the common channel for signal transmission/reception. On the other hand, when the obtained values exceed the threshold values, the wireless base station sets an individual channel and sets a wireless channel so as to be capable of the continued use of the individual channel for the exchange of signals.

Claims

1. A wireless channel setting method for a mobile communication system in which a common channel, which all mobile stations are permitted to use for signal exchange at the start of communication, and an individual channel, which is tuned through the setting process for each mobile station, are switched so as to be used as a wireless channel between a mobile station and a wireless base station, the method comprising the steps of:

receiving, at the wireless base station a transmission signal from a specific mobile station through the common channel; and

sequentially comparing, to a respective corresponding predetermined threshold value, a transmission power value to transmit to the mobile station, a communication quality level to transmit with a mobile station, and a utilization ratio of the common channel, wherein

when the transmission power value, the communication quality level and utilization ratio are lower than the respective corresponding predetermined threshold values, the wireless base station continues the signal transmission/reception, through the common channel, with the specific mobile station, and

when any of the sequentially compared transmission power value communication quality level, and utilization ratio exceed the respective corresponding predetermined threshold value, the wireless base station sets said individual channel and continues signal transmission/reception, through the individual channel, with the specific mobile station.

2. A mobile communication apparatus comprising:

a control signal processor for setting and switching wireless signals in accordance with a received instruction;

a wireless channel setting controller for determining which wireless channel is to be used by each mobile station based on a notified transmission power over the common channel, and for instructing the wireless channel to be used to the control signal processor; and

a transmission power measuring unit configured to measure the transmission power value over the wireless channel for each mobile station, and for notifying the transmission power value to the wireless channel setting controller,

a communication quality measuring unit configured to measure the communication quality level for each mobile station, and for notifying the communication quality to the wireless channel setting controller,

a utilization ratio measuring unit configured to measure the utilization ratio for the common channel, and for notifying the utilization ratio to the wireless channel setting controller,

wherein the wireless channel setting controller sequentially compares the transmission power value, the communications quality level and the utilization ratio, respectively with corresponding predetermined threshold values and,

when the transmission power value, the communication quality level and the utilization ratio are each lower than the respective corresponding predetermined threshold values, the wireless channel setting controller continues the transmission/reception of signals through the common channel with the specific mobile station, and

when any of the transmission power value, the communications quality level. and utilization ratio exceed the respective correpsonding predetermined threshold values, the wireless channel setting controller sets the individual channel for the specific mobile station and transmits an instruction to the control signal processor to continue the transmission/reception of signals through the individual channel.