Method for providing reserved communication access using multiple random access resources

• US 5,278,833 A
• Filed: 03/28/1991
• Issued: 01/11/1994
• Est. Priority Date: 03/28/1991
• Status: Expired due to Term

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Crisler, Kenneth J., Needham, Michael L.
• Primary Examiner(s): Olms, Douglas W.
• Assistant Examiner(s): Patel, Ajit
• Application Number:
  US07/676,923
• Time in Patent Office: 1,020 Days
• Field of Search: 370/85.2, 370/87.7, 370/104.1, 370/85.1, 370/94.1, 370/95.1, 370/95.3
• US Class Current: 370/348
• CPC Class Codes: H04B 7/2659 for data rate control
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 74/08 Non-scheduled access, e.g. ALOHA hybrid access H04W74/02
• CPC Class Codes: Y10S 370/913 Wireless or radio

Abstract

A communication resource is subdivided as a function of time into a plurality of time slots (210). These time slots are further subdivided on a non-periodic basis into a least two random access sub-slots (220), during which communication units (101) may request one or more reserved time slots (240). In response to such requests for reserved time slots from a requesting communication unit during one of the random access sub-slots, one or more reserved time slots are provided for use by the requesting communication unit.

Claims

1. A method of providing reserved communication resources, comprising the steps of:

A) subdividing a communication resource as a function, at least in part, of time, to provide a plurality of time slots;

B) on a non-periodic basis, subdividing at least one of the plurality of time slots into at least two random access sub-slots, during which random access sub-slots communication units can request a reserved time slot;

C) upon receiving a request for at least one reserved time slot from a requesting communication unit during one of the random access sub-slots, providing at least one reserved time slot for use by the requesting communication unit.

2. The method of claim 1, wherein step C includes the steps of:

C1) upon receiving a request for at least one reserved time slot from more than one requesting communication unit, providing at least one reserved time slot for use by a first requesting communication unit.

3. The method of claim 2, wherein step C further includes the steps of:

C2) queueing at least a second requesting communication unit, other than the first requesting communication unit, for subsequent provision of at least one reserved time slot.

4. A method of receiving a data packet, comprising the steps of:

A) subdividing a communication resource as a function, at least in part, of time, to provide a plurality of time slots;

B) on a non-periodic basis, subdividing at least one of the plurality of time slots into at least two random access sub-slots, during which said random access sub-slots, communication units can request a reserved time slot;

C) upon receiving a request for at least one reserved time slot from a requesting communication unit during one of the random access sub-slots, providing at least one reserved time slot for use by the requesting communication unit;

D) receiving said data packet during said at least one reserved time slot from said requesting communication unit.

5. The method of claim 4, wherein step C includes the steps of:

C1) upon receiving a request for at least one reserved time slot from more than one requesting communication unit, providing at least one reserved time slot for use by a first requesting communication unit.

6. The method of claim 5, wherein step C further includes the steps of:

C2) queueing at least a second requesting communication unit, other than the first requesting communication unit, for subsequent provision of at least one reserved time slot.

7. A method of transmitting a data packet, comprising the steps of:

A) determining whether a communication resource is available for random access;

B) upon determining that the communication resource is available for random access, choosing one of a plurality of random access subslots;

C) transmitting a request for at least one reserved time slot in the chosen random access subslot;

D) determining whether the reserved time slot has been assigned to support transmission of the data packet;

E) upon determining that the reserved time slot has been assigned to support transmission of the data packet, transmitting at least part of the data packet in the reserved time slot;

F) upon determining that the reserved time slot has not been assigned to support transmission of the data packet, repeating from step A.

8. The method of claim 7, and further including the step of:

F) upon determining that the reserved time slot has not been assigned to support transmission of the data packet, determining whether the request has been queued.

9. The method of claim 8, and further including the step of:

G) when the request has not been queued, repeating from step A.

10. The method of claim 9, and further including the step of:

H) when the request has been queued, monitor the communication to determine when the reserved time slot has been assigned to support transmission of the data packet.

11. A method of allocating radio frequency communication resources, comprising the steps of:

A) providing at least one radio frequency channel;

B) on a periodic basis, subdividing the radio frequency channel as a function of time into a plurality of time division multiplexed frames;

C) subdividing the time division multiplexed frames into a plurality of time division multiplexed time slots;

D) subdividing at least some of any of the time division multiplexed time slots that are not being currently used for reserved communication purposes into at least two random access sub-slots;

E) monitoring the random access sub-slots;

F) upon receiving a request for at least one reserved time slot from a requesting radio communication unit during one of the random access sub-slots, providing at least one reserved time slot for use by the requesting radio communication unit;

G) from time to time, using at least some of the subdivided time slots as reserved time slots by not subdividing the time slots into sub-slots.

12. The method of claim 11, wherein each time slot, and each sub-slot, includes a synchronization field.

13. The method of claim 11, wherein:

A) the at least one radio frequency channel is used for inbound messages from radio communication units.

14. The method of claim 13, and further comprising the step of:

H) providing at least one other radio frequency channel for outbound messages to radio communication units, which at least one other radio frequency channel is also subdivided into time division multiplexed frames and time slots, but not sub-slots.