Method and apparatus for admission control and resource tracking in a wireless communication system

• US 20060268702A1
• Filed: 03/29/2006
• Published: 11/30/2006
• Est. Priority Date: 04/01/2005
• Status: Active Grant

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Cuffaro, Angelo, Ali, Ahmed
• Granted Patent: US 7,801,043 B2
• Time in Patent Office: Days
• US Class Current: 370/230
• CPC Class Codes: H04L 47/10 Flow control; Congestion control
• CPC Class Codes: H04L 47/15 in relation to multipoint traffic arrangements for broadcast or multicast in data networks H04L12/18
• CPC Class Codes: H04L 47/28 in relation to timing considerations
• CPC Class Codes: H04L 47/70 Admission control; Resource allocation
• CPC Class Codes: H04L 47/762 triggered by the network
• CPC Class Codes: H04L 47/822 Collecting or measuring resource availability data
• CPC Class Codes: H04L 47/824 Applicable to portable or mobile terminals
• CPC Class Codes: H04L 47/826 Involving periods of time
• 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 8/04 Registration at HLR or HSS [Home Subscriber Server]

Abstract

A method and apparatus for admission control and resource tracking in a wireless communication system are disclosed. A wireless transmit/receive unit (WTRU) and a base station maintain parameters for admission control including parameters for the amount of time available for admission of traffic of each access category and for the amount of time available for admission of all access categories and parameters for admitted time and used time for the WTRU. Upon receipt of an admission request for a traffic stream from the WTRU, the base station determines whether to accept or deny the request based on the medium time for the requested traffic stream and the available time for the access category and total available time. The base station tracks the actually transmitted time by the WTRU, reclaims the unused time and returns the reclaimed time to either a common pool or to the WTRU as needed.

Claims

1. A method for admission control in a wireless communication system comprising a wireless transmit/receive unit (WTRU) and a base station, the method comprising:

the base station and the WTRU maintaining parameters for admission control, wherein the base station parameters include parameters for an amount of time available for admission of traffic of each access category and for an amount of time available for admission of all access categories, and the WTRU parameters include parameters for admitted time and used time for the WTRU;

the base station receiving an admission request for a traffic stream from the WTRU, the traffic stream being associated with a particular access category;

the base station determining whether to accept or deny the request based on a medium time for the requested traffic stream, the available time for the access category and total available time; and

if the medium time is less than the available time for the access category and the total available time, the base station admitting the request and updating the available time parameters, otherwise the base station rejecting the request.

2. The method of claim 1 wherein the WTRU explicitly requests an admission amount for the access category in the admission request.

3. The method of claim 2 wherein the WTRU request includes nominal medium access control (MAC) service data unit (MSDU) size, mean data rate, minimum physical layer (PHY) rate and surplus bandwidth allowance.

4. The method of claim 1 further comprising:

the WTRU adding the medium time for the traffic stream to the admitted time when the WTRU receives a response indicating that the request is accepted; and

the WTRU updating the used time each time the WTRU transmits data packets.

5. The method of claim 4 further comprising:

the WTRU determining each time the WTRU transmits data packets whether the used time is less than the admitted time, whereby the WTRU transmits data packets only if the used time is less than the admitted time for the WTRU.

6. The method of claim 4 wherein the used time is reset every one second interval.

7. The method of claim 1 wherein the base station reserves a minimum available time for each access category.

8. The method of claim 1 further comprising:

the base station tracking the actually transmitted time by the WTRU and comparing the actually transmitted time and the admitted time for the WTRU, whereby unused time is returned to a common pool.

9. The method of claim 8 wherein the tracking is performed for each traffic stream.

10. The method of claim 8 wherein the unused time is returned only if the base station has a minimum available time for the access category.

11. The method of claim 8 further comprising:

the base station determining whether actually transmitted time by the WTRU exceeds a currently allocated time for the WTRU, whereby unused time is returned to the WTRU if the actually transmitted time by the WTRU exceeds a currently allocated time for the WTRU.

12. Apparatus for admission control in a wireless communication system, the apparatus comprising:

a wireless transmit/receive unit (WTRU), comprising;

an admission control parameters database for maintaining parameters for admission control including parameters for admitted time and used time for the WTRU; and

a transmitter for transmitting an admission request for a traffic stream associated with a particular access category; and

a base station, comprising;

an admission control parameters database for maintaining parameters for admission control including parameters for an amount of time available for admission of traffic of each access category and for an amount of time available for admission of all access categories;

a receiver for receiving the admission request from the WTRU; and

a processor for determining whether to accept or deny the request based on a medium time for the requested traffic stream, the available time for the access category and total available time,

whereby the base station admits the request and updates the available time parameters if the medium time is less than the available time for the access category and the total available time, otherwise the base station rejects the request.

13. The apparatus of claim 12 wherein the WTRU explicitly requests an admission amount for the access category in the admission request.

14. The apparatus of claim 13 wherein the WTRU request includes nominal medium access control (MAC) service data unit (MSDU) size, mean data rate, minimum physical layer (PHY) rate and surplus bandwidth allowance.

15. The apparatus of claim 12 further comprising a receiver, wherein the processor in the WTRU adds the medium time for the traffic stream to the admitted time when the receiver in the WTRU receives a response indicating that the request is accepted, and the processor updates the used time each time the transmitter in the WTRU transmits data packets.

16. The apparatus of claim 15 wherein the processor in the WTRU determines each time the WTRU transmits data packets whether the used time is less than the admitted time, whereby the transmitter in the WTRU transmits data packets only if the used time is less than the admitted time for the WTRU.

17. The apparatus of claim 15 wherein the used time is reset every one second interval.

18. The apparatus of claim 12 wherein the base station reserves minimum available time for each access category.

19. The apparatus of claim 12 wherein the processor in the base station tracks the actually transmitted time by the WTRU and compares the actually transmitted time and the admitted time for the WTRU, whereby the unused time is returned to a common pool.

20. The apparatus of claim 19 wherein the tracking is performed for each traffic stream.

21. The apparatus of claim 19 wherein the unused time is returned only if the base station has a minimum available time for the access category.

22. The apparatus of claim 19 wherein the processor in the base station determines whether actually transmitted time by the WTRU exceeds a currently allocated time for the WTRU, whereby the unused time is returned to the WTRU if the actually transmitted time by the WTRU exceeds a currently allocated time for the WTRU.