Novel MBMS user detection scheme for 3GPP LTE

• US 20080165717A1
• Filed: 01/04/2007
• Published: 07/10/2008
• Est. Priority Date: 01/04/2007
• Status: Abandoned Application

• Current Assignee: Apple Inc.
• Original Assignee: Apple Inc.
• Inventors: Chen, Ning, Keating, Jeffrey, Ekambaram, Natarajan
• Application Number:
  US11/619,833
• Publication Number:
  US 20080165717A1
• Time in Patent Office: Days
• US Class Current: 370/312
• CPC Class Codes: H04W 72/30 Resource management for broadcast services

Abstract

An MBMS user detection system and methodology (300) is provided for advertising available MBMS services by multiplexing user feedback requests (303) using time, frequency and/or code diversity so that one or more MBMS service users can be detected in a single polling time interval. Available MBMS services are assembled into a user feedback request (302) and assigned unique multiplex signaling codes so that a code for a first MBMS service (302.1) is orthogonal to a code for a second MBMS service (302.k). In addition, a queuing model (610) is provided for analyzing and optimizing how services are advertised in the user feedback requests.

Claims

1. A method for detecting a plurality of Multimedia Broadcast Multicast Service (MBMS) service requests, comprising:

sending a user feedback request message in a first polling interval, where the user feedback request message comprises a plurality of available MBMS services and a corresponding plurality of multiplex signaling codes such that a unique multiplex signaling code is assigned to each available MBMS service; and

detecting a plurality of user feedback messages in the first polling interval, where each of the plurality of user feedback messages requests an MBMS service and is sent using a multiplex signaling code assigned to the requested MBMS service in the user feedback request message.

2. The method of claim 1, where the plurality of multiplex signaling codes comprises:

first access signaling information defined by a first frequency/code combination; and

second access signaling information defined by a second frequency/code combination that is orthogonal to the first frequency/code combination.

3. The method of claim 1, where the plurality of multiplex signaling codes comprises:

first access signaling information defined by one or both of a first signature sequence and a first frequency band; and

second access signaling information defined by one or both of a second signature sequence and a second frequency band, such that the first access signaling information is orthogonal to the second access signaling information.

4. The method of claim 1, further comprising sending one or more acknowledgment messages, where an acknowledgment message identifies one or more MBMS services that have been requested in previously detected user feedback messages.

5. The method of claim 1, where the user feedback request message is sent by a controller, such as an enhanced Node-B device, base station or network controller.

6. The method of claim 1, where the plurality of user feedback messages are sent by one or more user devices, such as a user equipment device, subscriber station or mobile device.

7. The method of claim 1, further comprising using a queuing model to adjust how many available MBMS services are included in the user feedback request message in response to changes in an average incoming service rate parameter.

8. The method of claim 1, further comprising using a queuing model to adjust the first polling interval in response to changes in an average incoming service rate parameter.

9. A method for multiplexing a plurality of Multimedia Broadcast Multicast Service (MBMS) service requests, comprising:

receiving a user feedback request message in a first polling interval, where the user feedback request message comprises a plurality of available MBMS services and a corresponding plurality of multiplex signaling codes such that a unique multiplex signaling code is assigned to each available MBMS service;

selecting one or more of the plurality of available MBMS services to be one or more requested MBMS services; and

sending one or more user feedback messages in the first polling interval, where each user feedback message identifies a requested MBMS service and is sent using a multiplex signaling code assigned to the requested MBMS service in the user feedback request message.

10. The method of claim 9, where the plurality of multiplex signaling codes comprises:

first access signaling information defined by a first frequency/code combination; and

second access signaling information defined by a second frequency/code combination that is orthogonal to the first frequency/code combination.

11. The method of claim 9, where the plurality of multiplex signaling codes comprises:

first access signaling information defined by one or both of a first signature sequence and a first frequency band; and

second access signaling information defined by one or both of a second signature sequence and a second frequency band, such that the first access signaling information is orthogonal to the second access signaling information.

12. The method of claim 9, further comprising receiving one or more acknowledgment messages, where an acknowledgment message identifies one or more MBMS services that have been requested in previously detected user feedback messages.

13. The method of claim 9, where the user feedback request message is sent by a controller, such as an enhanced Node-B device, base station or network controller.

14. The method of claim 9, where the one or more user feedback messages are sent by one or more user devices, such as a user equipment device, subscriber station or mobile device.

15. A communication device for multiplexing user feedback requests using frequency and code diversity signals, comprising:

a selection module for selecting one or more of a plurality of available Multimedia Broadcast Multicast Service (MBMS) services from a user feedback request message received in a first polling interval, where the user feedback request message comprises a plurality of available MBMS services, each of which has an assigned multiplex signaling code constructed from a unique combination of code sequence and frequency band so that the multiplex signaling codes are orthogonal to one another; and

a user feedback and encoding module for sending one or more user feedback messages in the first polling interval, where each of the one or more user feedback messages requests an MBMS service and is encoded using the assigned multiplex signaling code for the requested MBMS service.

16. The communication device of claim 15, where a first multiplex signaling code assigned to a first MBMS service comprises a first code sequence on a first frequency band, and where a second multiplex signaling code assigned to a second MBMS service comprises a second code sequence on a second frequency band, where the first code sequence and first frequency band are orthogonal to the second code sequence and the second frequency band.

17. The communication device of claim 15, where a first multiplex signaling code assigned to a first MBMS service comprises a first code sequence on a first frequency band.

18. The communication device of claim 17, where the user feedback and encoding module generates a user feedback message requesting the first MBMS service by transmitting a one-bit request message using the first code sequence on the first frequency band in a preamble sequence for non-synchronous Random Access Channel (RACH) access.

19. The communication device of claim 15, where the user feedback and encoding module is configured to receive one or more acknowledgment messages, where an acknowledgment message identifies one or more MBMS services that have been requested in previously detected user feedback messages.

20. The communication device of claim 19, where the user feedback and encoding module is configured to stop sending user feedback messages requesting any MBMS services identified in the acknowledgement message.