Medium access control for wireless systems

• US 8,416,746 B2
• Filed: 07/06/2010
• Issued: 04/09/2013
• Est. Priority Date: 07/07/2008
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Apple Inc.
• Inventors: Fong, Mo-Han, Zhang, Hang, Novak, Robert
• Primary Examiner(s): ROSE, KERRI M
• Application Number:
  US12/831,058
• Publication Number:
  US 20110075604A1
• Time in Patent Office: 1,008 Days
• Field of Search: 370329-332, 370/338, 370464-469, 455436-440, 455450-453
• US Class Current: 370/332
• CPC Class Codes: H04L 63/162 at the data link layer
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 52/262 taking into account adaptive modulation and coding [AMC] scheme AMC per se H04L1/0001
• CPC Class Codes: H04W 74/00 Wireless channel access
• CPC Class Codes: H04W 8/26 Network addressing or numbering for mobility support

Abstract

A method for execution by a mobile station (MS) in a mobile communications network, the method comprising: receiving a first MS identifier from the network during a ranging operation involving the MS; using the first MS identifier to extract the contents of at least one message received from the network during said ranging operation; using a second MS identifier, different from the first MS identifier, to extract the contents of at least one message received from the network after said ranging operation is complete. Also, a method for execution by the base station, comprising: outputting a first message destined for the MS, the first message including a first identifier for use by the MS during a ranging operation; determining that said ranging operation is complete; outputting a second message destined for the MS, the second message including a second identifier for use by the MS in subsequent communication with the network.

Claims

1. A method for execution by a mobile station in a mobile communications network, the method comprising:

receiving a first mobile station identifier from the network during a ranging operation involving the mobile station;

using the first mobile station identifier to extract the contents of at least one message received from the network during said ranging operation;

receiving a second mobile station identifier subsequent to completion of the ranging operation;

using the second mobile station identifier, different from the first mobile station identifier, to extract the contents of at least one message received from the network after said ranging operation is complete.

2. The method defined in claim 1, wherein the first mobile station identifier is included in a first message received from the network during the ranging operation.

3. The method defined in claim 2, further comprising, prior to receipt of the first message:

sending a ranging message to the network, the ranging message characterized by a set of ranging resources.

4. The method defined in claim 3, wherein the first message further identifies the set of ranging resources.

5. The method defined in claim 4, further comprising:

determining that the first message is destined for the mobile station based on the set of ranging resources identified in the first message.

6. The method defined in claim 1, further comprising, after receiving the first mobile station identifier:

sending a ranging message to the network, the ranging message being characterized by a set of ranging resources.

7. The method defined in claim 1, wherein at least one of the at least one message received during the ranging operation comprises an indication of completion of the ranging operation.

8. The method defined in claim 1, wherein the second mobile station identifier is included in a particular message received during the ranging operation.

9. The method defined in claim 8, further comprising:

determining that the particular message is destined for the mobile station based on a presence of the first mobile station identifier in the particular message.

10. The method defined in claim 1, the mobile station being uniquely addressable relative to other mobile stations by a unique identifier, the method further comprising, prior to receiving the second mobile station identifier:

sending a message including the unique identifier to the network.

11. The method defined in claim 10, wherein the message including the unique identifier is sent in accordance with uplink parameters, the method further comprising, after receiving the second mobile station identifier and prior to sending the message including the unique identifier:

receiving a granting message from the network, the granting message indicating the uplink parameters for transmission of the message including the unique identifier.

12. The method defined in claim 11, wherein the granting message includes the first mobile station identifier.

13. The method defined in claim 12, wherein at least one of the at least one message received during the ranging operation comprises the granting message.

14. The method defined in claim 1, further comprising:

carrying out a scanning and synchronization process to identify a base station in the network from which to expect to receive the first mobile station identifier.

15. A mobile station comprising:

receive circuitry configured for;

receiving messages from a network, at least one of the messages received during a ranging operation and comprising a first mobile station identifier; and

receiving a second mobile station identifier subsequent to completion of the ranging operation;

a processing entity configured for extracting the contents of at least one message received from the network during said ranging operation based on the first mobile station identifier and for extracting the contents of at least one message received from the network after said ranging operation is complete based on a second mobile station identifier different from the first mobile station identifier.

16. A method for execution by a base station in a mobile communications network, comprising:

outputting a first message destined for a mobile station, the first message including a first mobile station identifier for use by the mobile station during a ranging operation;

determining that said ranging operation is complete;

outputting a second message destined for the mobile station, the second message including a second mobile station identifier for use by the mobile station in subsequent communication with the network.

17. The method defined in claim 16, wherein said outputting the first message is performed after receiving a ranging message from the mobile station, the ranging message characterized by a set of ranging resources.

18. The method defined in claim 17, further comprising assigning the set of ranging resources to be used by the mobile station in transmitting the ranging message.

19. The method defined in claim 18, further comprising, after outputting the first message:

receiving a second ranging message; and

processing the second ranging message to determine whether the ranging operation is complete.

20. The method defined in claim 19, wherein the second ranging message is characterized by a second set of ranging resources.

21. The method defined in claim 20, further comprising assigning the second set of ranging resources to be used by the mobile station in transmitting the second ranging message.

22. The method defined in claim 21, wherein the second set of ranging resources is different from the first set of ranging resources.

23. The method defined in claim 22, wherein the second set of ranging resources includes a smaller timing offset than the first set of ranging resources.

24. The method defined in claim 23, further comprising outputting a third message destined for the mobile station, the third message comprising the second set of ranging resources.

25. The method defined in claim 16, further comprising:

receiving a globally unique identifier from the mobile station;

consulting a memory based on the globally unique identifier to obtain the second mobile station identifier.

26. The method defined in claim 16, further comprising, prior to completion of said ranging operation, sending at least one message to the mobile station that uses the first mobile station identifier.

27. The method defined in claim 16, further comprising, after to completion of said ranging operation, sending at least one message to the mobile station that uses the second mobile station identifier.

28. A base station comprising:

transmit circuitry configured for outputting messages destined for a mobile station;

a processing entity configured for determining when a ranging operation involving a mobile station is complete, for inserting into a first one of the messages transmitted during the ranging operation a first mobile station identifier for use by the mobile station during said ranging operation, and for inserting into a second one of the messages a second mobile station identifier for use by the mobile station after said ranging operation is complete.

29. A method for data transmission, comprising:

accessing a memory to obtain an amount of data associated with a service flow established with a recipient and to be transmitted thereto;

accessing the memory to obtain control information characterizing the service flow;

formulating a datagram by placing at least some of the data into a payload of the datagram and placing, in a header of the datagram, the control information characterizing the service flow, wherein the control information characterizing the service flow occupies a fewer than sixteen bits of the header;

modulating a radio frequency signal with the datagram and releasing the radio frequency signal over a wireless medium.

30. The method defined in claim 29, wherein the control information characterizing the service flow occupies at least three bits of the header.

31. The method defined in claim 29, wherein the control information characterizing the service flow occupies at least four bits of the header.