Uplink detection of schedule mobiles for avoiding access delays

• US 6,519,469 B1
• Filed: 07/02/1999
• Issued: 02/11/2003
• Est. Priority Date: 07/02/1999
• Status: Expired due to Term

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Lindskog, Jan, Rydnell, Gunnar, Pohjanvuori, Timo
• Primary Examiner(s): Le, Thanh Cong
• Assistant Examiner(s): Corsaro, Nick
• Application Number:
  US09/347,022
• Time in Patent Office: 1,320 Days
• Field of Search: 370/348, 370/349, 370/355, 370/352, 370/311, 455/466, 455/455, 455/450, 455/452, 455/574
• US Class Current: 455/466
• CPC Class Codes: H04L 1/0045 Arrangements at the receiver end
• CPC Class Codes: H04L 1/0061 Error detection codes
• CPC Class Codes: H04L 1/0072 Error control for data other than payload data, e.g. control data
• CPC Class Codes: H04W 72/12 Wireless traffic scheduling
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network

Abstract

The present invention provides a method and system for reducing the delay of the transmission of packet data including storing, by a base station, data associated with a mobile station from a first packet data transaction. A packet for starting a second packet data transaction is received from a mobile station and the base station determines whether or not the packet has been correctly received. The base station correlates at least one field in the packet with the stored data. If the base station is able to identify the mobile station based on the correlation with the stored data, then the base station reserves a resource for transmission of a subsequent packet from the mobile station regardless of whether or not the packet has been correctly received.

Claims

1. A method for transmitting packet data in a radiocommunication system comprising the steps of:

storing, by a base station, data associated with a mobile station from a first packet data transaction;

receiving, from said mobile station, a packet for starting a second packet data transaction;

determining, by said base station, whether said packet has been correctly received;

correlating said stored data with at least one field in said packet; and

reserving, by said base station, a resource for transmission of at least one subsequent packet from said mobile station regardless of whether said packet has been correctly received if said step of correlating verifies an identity of said mobile station.

2. The method of claim 1, wherein said step of storing data stored a mobile identification number field.

3. The method of claim 1, wherein said step of determining is based on a checksum value.

4. The method of claim 1, wherein step of reserving said resource assigns at least one time slot.

5. The method of claim 1, wherein said step of receiving receives said packet during a fast page mode time slot.

6. The method of claim 1, said method further comprising the step of:

transmitting, by said base station, a transmission opportunity message to said mobile station, wherein said packet from said mobile station is received in response to said transmission opportunity message.

7. The method of claim 6, wherein said transmitting step transmits said transmission opportunity message in an active mode.

8. The method of claim 6, wherein said transmitting step transmits said transmission opportunity message in a fast page mode.

9. The method of claim 6, wherein said transmitting step transmits said transmission opportunity message while said mobile station is in a sleep mode.

10. A method for reducing the delay of the transmission of packet data comprising:

receiving a packet, said packet including a first portion, a second portion, and a packet type field said second portion including a checksum;

decoding the contents of the packet;

verifying the accuracy of the contents based on said checksum;

comparing said first portion of said packet with a stored portion if said verifying step indicates an error in the decoding step; and

assigning a time slot for the receipt of an additional packet if said first portion matches said stored portion.

11. The method of claim 10, wherein said first portion and said stored portion include a mobile identification number field.

12. The method of claim 10, wherein said first portion and said stored portion include at least one of a mobile station capability field and a modulation proposal field.

13. The method of claim 10, wherein said comparing step compares said first portion and said packet data field with said stored portion.

14. The method of claim 10, wherein said packet is received in a first mode and wherein said time slot is assigned for a second mode.

15. The method of claim 14, wherein said first mode is a fast page mode and wherein said second mode is an active mode.

16. The method of claim 10, wherein said first portion and said stored portion each comprise a predetermined number of bits, said comparing step further comprising:

comparing each bit of said first portion with said second portion,

indicating that said first portion matches said second portion if a respective predetermined number of bits match from said first portion and said second portion.

17. A base station comprising:

a transceiver for receiving a data packet from a mobile station, said data packet including a first portion, a second portion, and a packet type field;

decoding the means for decoding contents of the packet;

verifying means for verifying the accuracy of the contents based on a checksum; and

a processor for comparing said first portion of said data packet with a stored portion if said verifying means indicates an error in the decoding of the packet contents,

wherein said processor assigns a time slot for the receipt of an additional packet if said first portion matches said stored portion.

18. The base station of claim 17, wherein said first portion and said stored portion comprise a mobile identification number field.

19. The base station of claim 17, wherein said first portion and said stored portion comprise at least one of a mobile station capability field and a modulation proposal field.

20. The base station of claim 17, wherein said processor compares said packet type field and said first portion with said stored portion.

21. The base station of claim 17, wherein said second portion includes a checksum.