Mobile communication systems, mobile stations, base station controllers and packet data service nodes

• US 7,085,579 B2
• Filed: 03/30/2001
• Issued: 08/01/2006
• Est. Priority Date: 04/17/2000
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Mizutani, Mika, Yano, Masashi, Matsui, Susumu, Hirata, Tetsuhiko
• Primary Examiner(s): Eng, George
• Assistant Examiner(s): Cho, Un C.
• Application Number:
  US09/823,135
• Publication Number:
  US 20010031634A1
• Time in Patent Office: 1,950 Days
• Field of Search: 455/512, 455/450, 455/451, 455/452.1, 455/517, 455/67.11, 455/550.1, 455/55, 370/329, 370/330, 370/331
• US Class Current: 455/512
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 52/0254 detecting a user operation or a tactile contact or a motion of the device
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/56 based on priority criteria
• CPC Class Codes: H04W 76/20 Manipulation of established connections
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A mobile communication system with a packet switching function which enables sharing of radio resources among mobile stations, wherein a mobile station which has generated a request for communication quality assurance periodically sends a packet for requesting preferential use of a radio channel in order to prevent timeout of the state transition timer, timeout of which would cancel radio channel assignment to the mobile station and bring it into a dormant state if a certain period elapses without transmission or reception of a signal, so that it can remain in the active state and hold the radio channel continuously. In addition, when the mobile station requesting communication quality assurance moves from one cell to another or requests radio channel assignment, the base station controller controls the radio base station so that the mobile station can be assigned a radio channel by sending a priority request packet.

Claims

1. A mobile station for wireless communication with a base station, said mobile station having a control section comprising:

a CPU,

a memory,

a bus, connecting said CPU, said memory to a transmission and reception processor;

a PPP keep alive timer and a wireless channel state timer, wherein said point-to-point protocol (PPP) keep alive timer and said wireless channel state timer are set to operate in parallel;

wherein when said mobile station requests preferential use of a wireless communication channel, said wireless communication channel having been assigned by said base station, said CPU periodically causes sending of a priority request to said base station via said transmission/reception processor;

wherein said PPP keep alive timer begins counting from a time of one of a last signal transmission and a last signal reception; and

wherein upon timeout of said PPP keep alive timer, said control section causes sending of said base station said priority request, and restarts said PPP keep alive timer.

2. The mobile station as defined in claim 1, wherein,

if said radio channel is used preferentially, said control section sets a counting period for said PPP keep alive timer to a value smaller than a channel holding period, said channel holding period being a time measured from any of a last signal transmission and a last signal reception, and until said base station cancels a radio channel assignment to said mobile station.

3. The mobile station as defined in claim 2, wherein said wireless channel state timer counts said channel holding period;

and wherein

if said wireless channel state timer reaches said channel holding period, said control section discontinues sending said priority request.