Bandwidth allocation

• US 5,729,531 A
• Filed: 10/18/1995
• Issued: 03/17/1998
• Est. Priority Date: 10/18/1995
• Status: Expired due to Term

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Sicher, Alan Eric, Diachina, John, Raith, Alex Krister, Andersson, Karl-Erik, Henry, Raymond C., Prokup, Steven, Billstrom, Lars
• Primary Examiner(s): MARCELO, MELVIN C
• Application Number:
  US08/544,490
• Time in Patent Office: 881 Days
• Field of Search: 370/17, 370/50, 370/79, 370/95.1, 370/95.3, 370/252, 370/317-321, 370/329-337, 370/347, 370/442, 455/63, 455/423, 455/426, 455/434, 455/435, 455/438, 455/452, 455/453
• US Class Current: 370/252
• CPC Class Codes: H04W 36/22 for handling the traffic
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/52 based on load
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method for reassigning mobile stations a new phase within a channel is disclosed. In a communication system, a plurality of mobile stations attempt to communicate on a limited number of channels. The invention first uses a general allocation method to approximately evenly distribute the mobile stations on the available channels. After a mobile station begins active communication on the system, a second allocation method is used to change the phase of some mobile stations on a channel which has become heavily loaded. In addition, a message can also be sent to mobile stations assigned to but not yet actively communicating on the heavily loaded channel indicating that the mobile stations should change to a new channel.

Claims

1. A method for assigning mobile stations to phases within a channel in a communication system, comprising the steps of:

distributing mobile stations among available channels prior to or after registration so that said mobile stations are approximately evenly distributed before said mobile stations begin communicating with the system;

assigning mobile stations to predetermined phases within their assigned channel; and

reassigning mobile stations to different phases within their assigned channel to further distribute the mobile stations once the mobile stations begin communicating with the system.

2. A method according to claim 1, wherein said distribution of mobile stations is based on attributes of the mobile stations.

3. A method according to claim 1, wherein said distribution of each mobile station is based on a mobile station identity.

4. A method according to claim 1, wherein some of said mobile stations are in a sleep mode after registration and therefore have a minimum bandwidth communication path with the system.

5. A method according to claim 1, wherein some of said mobile stations are reading all timeslots after registering with the system and therefore have a maximum bandwidth communication path activated with the system.

6. A method according to claim 1, wherein said phases relate to time slots within a TDMA frame.

7. In a wireless packet data communication system wherein multiple mobile stations transmit packets of data on a single TDMA channel, a method comprising the steps of:

providing a plurality of TDMA channels on a single frequency including said single TDMA channel;

dividing a plurality of mobile stations among said plurality of TDMA channels to achieve substantially even loading of each of said plurality of TDMA channels whereby said multiple mobile stations are assigned to said single TDMA channel;

transmitting, by at least some of said multiple mobile stations on said single TDMA channel;

evaluating loading of said single TDMA channel; and

selectively reassigning at least one of said multiple mobile stations either to another of said plurality of TDMA channels on said single frequency or to a TDMA channel on another frequency.

8. The method of claim 7 wherein said step of selectively reassigning further comprises the step of:

reassigning said at least one of said multiple mobile stations to said another of said plurality of TDMA channels on said single frequency when said at least one of said multiple mobile stations has begun transmitting on said single TDMA channel.

9. The method of claim 7 wherein said step of selectively reassigning further comprises the steps of:

reassigning said at least one of said multiple mobile stations to said TDMA channel on another frequency when said at least one of said multiple mobile stations has not yet begun transmitting on said single TDMA channel.