Voice-data integrated multiaccess by self-reservation and stabilized aloha contention

• US 9,351,318 B2
• Filed: 08/18/2014
• Issued: 05/24/2016
• Est. Priority Date: 10/07/1998
• Status: Expired due to Fees

• Current Assignee: AT&T Intellectual Property II LP (AT&T, Inc.)
• Original Assignee: AT&T Intellectual Property II LP (AT&T, Inc.)
• Inventors: Ho, Jin-Meng
• Primary Examiner(s): Jagannathan, Melanie
• Application Number:
  US14/462,001
• Publication Number:
  US 20140355549A1
• Time in Patent Office: 645 Days
• US Class Current: 1/1
• CPC Class Codes: H04W 28/20 Negotiating bandwidth
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 74/006 in the downlink, i.e. towards the terminal
• CPC Class Codes: H04W 74/08 Non-scheduled access, e.g. ALOHA hybrid access H04W74/02
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access
• CPC Class Codes: H04W 74/0875 with assigned priorities based access

Abstract

A multiple access communication protocol that includes an uplink and a downlink channel is disclosed. The uplink channel has a plurality of frames, such that each frame has a first selectable number of minislots and a second selectable number of slots. A reservation request of a first type is sent into a first selected minislot of a selected frame of the uplink channel when information of a first type is to be sent. The reservation request of the first type requests an assignment for at least one slot for transmitting information of the first type in at least one frame that is subsequent to the selected frame. A reservation request of a second type is sent into a second selected minislot of the selected frame when the second selected minislot is available in the selected frame and when information of a second type is to be sent.

Claims

1. A method, comprising:

responsive to a first reservation request, via a downlink channel, broadcasting, by a central station, information regarding an assignment of a first slot of a plurality of slots to transmit voice traffic, the plurality of slots transmitted via an uplink channel, wherein the first reservation request is to cause a contention-free reservation of the first slot;

via the downlink channel, broadcasting, by the central station, information regarding a reassignment of a second slot of the plurality of slots to transmit data traffic, the second slot previously assigned to transmit the voice traffic, where the data traffic that is assigned to the second slot is based on a blocked binary tree algorithm, wherein the second slot is reassigned to the data traffic during a period of speech silence in the voice traffic; and

responsive to a second reservation request to transmit a speech talkspurt of the voice traffic, via the downlink channel, broadcasting, by the central station, information regarding a reassignment of the second slot to the voice traffic.

2. The method of claim 1, further comprising:

receiving the first reservation request in a first selected minislot of a frame of a plurality of frames transmitted via the uplink channel, each frame of the plurality of frames comprising a variable number of minislots and a variable number of slots.

3. The method of claim 1, further comprising:

receiving information indicating that a frame transmitted via the uplink channel comprises the voice traffic in the first slot.

4. The method of claim 1, further comprising:

responsive to a determination of an end of a speech talkspurt in the voice traffic, broadcasting information regarding an assignment of a minislot to carry the voice traffic, the minislot adapted to transmit at least one of silence compression and background imitation during the period speech silence in the voice traffic.

5. The method of claim 1, further comprising:

responsive to a third reservation request, broadcasting information regarding an assignment of a third slot to transmit the data traffic, wherein the data traffic assigned to the third slot is based on a blocked binary tree algorithm.

6. The method of claim 1, further comprising:

before an end of a frame comprising the first reservation request, via the downlink channel, broadcasting a feedback message comprising;

minislot assignments for sending reservation requests related to the voice traffic and the data traffic, in the uplink channel, slot assignments for transmitting the voice traffic and the data traffic in the uplink channel, minislot contention results for reservation requests for slots for the data traffic received in the frame comprising the first reservation request, and a measurement of a data traffic backlog.

7. The method of claim 1, further comprising:

via the downlink channel, broadcasting a feedback message comprising;

minislot assignments for requests related to the data traffic, the minislot assignments selected by the central station for a contention subgroup of terminals, the minislot assignments identified by a level in a virtual stack from a plurality of minislots available for sending reservation requests for the data traffic that have experienced unresolved collisions.

8. The method of claim 1, further comprising:

via a downlink channel, broadcasting a feedback message comprising;

a number of minislots available in the second frame for sending reservation requests for slots for the data traffic, and

a new allocation time for reservation requests for slots for the data traffic to be initiated in the second frame.

9. The method of claim 1, further comprising:

via the uplink channel, receiving a third reservation request for an assigned slot for the data traffic via a predetermined minislot selected independently and at random with equal probability from a plurality of minislots available for sending new reservation requests for assigned slots for the data traffic arriving between a first allocation time and a second allocation time.

10. The method of claim 1, further comprising:

via the uplink channel, receiving a third reservation request for an assigned slot for the data traffic; and

making a determination that a virtual stack level associated with the third reservation request for the assigned slot for the data traffic has a smaller value than the number of minislots available for sending reservation requests for slots for the data traffic.

11. The method of claim 1, further comprising:

via the uplink channel, receiving a third reservation request for at least one slot for the data traffic; and

making a determination that a number of virtual stack levels associated with reservation requests for assigned slots for the data traffic undergoing collision resolution is smaller than the number of minislots available for sending reservation requests for assigned slots for the data traffic.

12. The method of claim 1, further comprising:

assigning at least one minislot in the uplink channel based upon minislot contention information, wherein the minislot contention information comprises information relating to a successful sending of a third reservation request for a slot for the data traffic.

13. The method of claim 1, further comprising:

assigning at least one minislot in the uplink channel based upon minislot contention information, wherein the minislot contention information comprises information relating to a collision of a third reservation request for a slot for the data traffic.

14. The method of claim 1, further comprising:

adjusting a virtual stack level value identifying a contention subgroup of terminals from which a third reservation request for a slot for the data traffic in the uplink channel has been received, the virtual stack level value based on minislot contention information.

15. The method of claim 1, further comprising:

subtracting one from a virtual stack level value for each noncolliding contention subgroup of terminals identified by virtual stack levels less than a particular virtual stack level associated with a third reservation request for a slot for the data traffic, the virtual stack level adapted to identify a contention subgroup of terminals sending reservation requests for slots for the data traffic via the uplink channel.

16. The method of claim 1, further comprising:

adding one to a virtual stack level value for each colliding contention subgroup of terminals identified by a virtual stack level that is less than a particular virtual stack level associated with a third reservation request for a slot for the data traffic, the virtual stack level adapted to identify a contention subgroup of terminals sending reservation requests for slots for the data traffic via the uplink channel.

17. The method of claim 1, further comprising:

receiving a message indicative of an end of an additional speech talkspurt in a portion of the voice traffic that is transmitted in the first slot.

18. A communication system comprising:

at least one user terminal to communicate on an uplink channel; and

a central station to communicate on a downlink channel, the central station to;

responsive to a first reservation request, broadcast information regarding an assignment of a first slot of a plurality of slots to transmit voice traffic, the plurality of slots transmitted via an uplink channel, wherein the first reservation request is to cause a contention-free reservation of the first slot;

broadcast information regarding a reassignment of a second slot of the plurality of slots to transmit data traffic, the second slot previously assigned to transmit voice traffic, the data traffic assigned to the second slot based on a blocked binary tree algorithm, wherein the second slot is reassigned to the data traffic during a period of speech silence in the voice traffic; and

responsive to a second reservation request to transmit a speech talkspurt of the voice traffic, via the downlink channel, broadcasting information regarding a reassignment of the second slot to the voice traffic.

19. A central station embodying instructions to:

responsive to a first reservation request, via a downlink channel, broadcast information regarding an assignment of a first slot of a plurality of slots to transmit voice traffic, the plurality of slots transmitted via an uplink channel, wherein the first reservation request is to cause a contention-free reservation of the first slot;

via the downlink channel, broadcast information regarding a reassignment of a second slot of the plurality of slots to transmit data traffic, the second slot previously assigned to transmit voice traffic, the data traffic assigned to the second slot based on a blocked binary tree algorithm, wherein the second slot is reassigned to the data traffic during a period of speech silence in the voice traffic; and

responsive to a second reservation request to transmit a speech talkspurt of the voice traffic, via the downlink channel, broadcast information regarding a reassignment of the second slot to the voice traffic.