Shared transmission of control information in high data rate communications systems

• US 20020080820A1
• Filed: 12/21/2000
• Published: 06/27/2002
• Est. Priority Date: 12/21/2000
• Status: Abandoned Application

• Current Assignee: Nortel Networks Limited (Nortel Networks Corporation)
• Original Assignee: Nortel Networks Limited (Nortel Networks Corporation)
• Inventors: Cheong, Yoon Chae, Periyalwar, Shalini S., Hashem, Bassam M.
• Application Number:
  US09/741,349
• Publication Number:
  US 20020080820A1
• Time in Patent Office: Days
• US Class Current: 370/471
• CPC Class Codes: H04W 48/12 using downlink control channel
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

A method for sharing transmission of control messages over high data rate networks. Whenever there are data transmitted on the downlink, the control messages are piggybacked. If there is no data transmitted on the downlink, a shared control MAC frame is used. The variable size shared control MAC frame includes same type of control messages for a plurality of fixed terminals. Control information identifiers (CIIDs) are used to indicate the type of the transmitted control messages. The appropriate control information is timely delivered to an identified terminal. Such scalable MAC frame allows for flexibility and an efficient use of high data rate (HDR) transmissions.

Claims

1. A method for transmitting a type of control messages to a plurality of fixed terminals of a wireless communications systems, each said fixed terminals having a connection identification (CID), said method comprising the steps of:

a) determining when to broadcast said type of control messages;

b) if data is currently transmitted on the downlink, piggybacking said control messages with said transmitted data; and

c) if data is not currently transmitted on the downlink, transmitting a media access control (MAC) information to said fixed terminals, said MAC information comprising a control message for each said fixed terminals.

2. The method of claim 1, wherein said MAC information comprising a MAC control frame structure for distributing said control message to each said fixed terminals, said MAC control frame structure comprising:

one activity field for each said fixed terminals, said activity field including a first field containing said CID and a second field containing control information,

a control information identifier (CIID) field specifying said type of control messages, and

a number field indicating the number of said control messages contained in said MAC control frame structure.

3. The method of claim 2, further comprising the step of accessing said control information based on said CID.

4. The method of claim 1, wherein said type of control messages including power control, time alignment, acknowledgements, and combinations thereof.

5. The method of claim 1, wherein said control messages are automatically included in a downlink frame whenever the size of said downlink frame is smaller than a minimum granularity.

6. The method of claim 2, further comprising the step of signalling in advance to a designated terminal a location in said MAC frame containing said control information for said designated terminal.

7. A computer-readable medium containing computer executable instructions for transmitting a type of control messages to a plurality of fixed terminals in a wireless communications systems, each said fixed terminals having a connection identification (CID), said medium for performing the steps of:

a) determining when to broadcast said type of control messages;

b) if data is currently transmitted on the downlink, piggybacking said control messages with said transmitted data; and

c) if data is not currently transmitted on the downlink, transmitting a media access control (MAC) information to said plurality of fixed terminals, said MAC information comprising a control message for each said fixed terminals.

8. The computer-readable medium of claim 7, wherein said MAC information comprising a MAC control frame structure for distributing said control message to each said fixed terminals, said MAC control frame structure comprising:

one activity field for each said fixed terminals, said activity field including a first field containing said CID and a second field containing control information,

a control information identifier (CIID) field specifying said type of control messages, and

a number field indicating the number of said control messages contained in said MAC control frame structure.

9. The computer-readable medium of claim 8, further comprising the step of accessing said control information based on said CID.

10. The computer-readable medium of claim 7, wherein said type of control messages including power control, time alignment, acknowledgements, and combinations thereof.

11. The computer-readable medium of claim 7, wherein said control messages are automatically included in a downlink frame whenever the size of said downlink frame is smaller than a minimum granularity.

12. The computer-readable medium of claim 8, further performing the step of signalling in advance to a designated terminal a location in said MAC frame containing said control information for said designated terminal