Mobile communication method

• US 6,925,302 B2
• Filed: 05/22/2003
• Issued: 08/02/2005
• Est. Priority Date: 05/23/2002
• Status: Expired due to Fees

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Watanabe, Hitoshi, Kojima, Junichiroh
• Primary Examiner(s): Trinh, Sonny
• Assistant Examiner(s): TORRES, MARCOS L
• Application Number:
  US10/442,925
• Publication Number:
  US 20030220108A1
• Time in Patent Office: 803 Days
• Field of Search: 455/452.1, 455/450, 455/453, 455/439, 455/438, 455/437, 455/512, 455/509, 455/166.2, 455/150.1, 455/161.1, 455/410, 455/435.3
• US Class Current: 455/435.3
• CPC Class Codes: H04W 28/0289 Congestion control load shedding arrangements in network planning H04W16/08; performing reselection for handling the traffic H04W36/22; wireless traffic scheduling H04W72/12
• CPC Class Codes: H04W 36/22 for handling the traffic
• CPC Class Codes: H04W 4/90 Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
• CPC Class Codes: H04W 76/50 for emergency connections
• CPC Class Codes: H04W 8/18 Processing of user or subscriber data, e.g. subscribed services, user preferences or user profiles; Transfer of user or subscriber data

Abstract

In a mobile terminal communication method, when a zone in which a mobile terminal is positioned becomes in a congestion state, a calling channel having high emergency can be secured. A connection priority rank is given to each mobile terminal. When an area in which a calling mobile terminal is positioned is in the congestion state, the number of currently-used calling channels in the same connection priority rank as that of the mobile terminal is compared with the number of the calling channels set to the rank. Depending on its result, the call is disconnected or another mobile terminal in a low connection priority rank is handed off to another area.

Claims

1. A mobile terminal communication method comprising the steps of:

(a) setting a connection priority rank for each mobile terminal to store the same;

(b) deciding whether an area in which a first calling mobile terminal is positioned is in a congestion state or not;

(c) when not being in the congestion state, allocating a calling channel to establish calling; and

(d) when being in the congestion state,

(d-1) when the number of currently-used calling channels in the same connection priority rank as that of the first mobile terminal is larger than the number of calling channels set to the rank, disconnecting said call;

(d-2) when the number of currently-used calling channels in the same connection priority rank as that of the first mobile terminal is smaller than the number of calling channels set to the rank, searching for the rank in which the number of currently-used calling channels is larger than the set number of calling channels in the order of the lowest rank of the respective connection priority ranks set in the area in which the first mobile terminal is positioned; and

(d-3) selecting a second mobile terminal belonging to the first corresponding rank to hand off the second mobile terminal to another area, and allocating a calling channel to the first mobile terminal to establish calling.

2. The communication method according to claim 1, wherein when a second mobile terminal cannot be handed off, a call of the second mobile terminal is disconnected.

3. The communication method according to claim 1, wherein said congestion state is a state that all currently-usable calling channels in said area are in use.

4. The communication method according to claim 1, wherein said area is part of a zone in which a base station communicates with a mobile terminal.

5. The communication method according to claim 1, wherein a base station receives a call from a mobile terminal, and a base control station controlling one or more base stations controls calling based on the connection priority rank of said call and the congestion state of said area.

6. A mobile terminal communication method comprising the steps of:

(a) setting a connection priority rank to each mobile terminal to store the same;

(b) when a first calling mobile terminal belongs to the highest connection priority rank, allocating a calling channel to establish calling;

(c) when said first mobile terminal is not in the highest connection priority rank, deciding whether a base station which has received a call is in a congestion state or not;

(d) when not being in the congestion state, allocating a calling channel to establish calling;

(e) when being in the congestion state, when said first calling mobile terminal is in the lowest connection priority rank, disconnecting the call;

(f) searching for a base station which is adjacent said base station which has received the call and is not in the congestion state, when there is no corresponding base station, disconnecting the call, and when there is a corresponding base station, permitting use of an available channel of the base station; and

(g) when there is not the available channel, allocating a calling channel of a second mobile terminal having the longest call in a zone of said adjacent base station to said first mobile terminal.

7. The communication method according to claim 6, wherein said second mobile terminal having the longest call is moved to another calling channel.

8. The communication method according to claim 6, wherein said congestion state is a state that all currently-usable calling channels except for the number of the calling channels in the highest connection priority rank in one base station are in use.

9. The communication method according to claim 6, wherein a base station receives a call from a mobile terminal, and a base control station controlling one or more base stations controls calling based on the connection priority rank of said call and the congestion state of the base station.