INTERLEAVING DATA OVER FRAMES COMMUNICATED IN A WIRELESS CHANNEL

• US 20090310540A1
• Filed: 08/21/2009
• Published: 12/17/2009
• Est. Priority Date: 04/03/2000
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Apple Inc.
• Inventors: Barany, Peter A., Bontu, Chandra S.
• Granted Patent: US 8,406,172 B2
• Time in Patent Office: Days
• US Class Current: 370/328
• CPC Class Codes: H04B 7/2656 for structure of frame, burst

Abstract

A mobile communications system includes a radio access network, such as an Enhanced General Packet Radio Service (EGPRS) network, in which mobile stations are able to enter into a discontinuous transmission (DTX) mode. During DTX mode of a first mobile station that is allocated a channel portion (e.g., a time slot of a frame), the radio access network is able to multiplex traffic from another mobile station onto the same channel portion. A mechanism is provided to enable the first mobile station to send a request for re-allocation of the channel portion. The request includes a real-time fast access associated control channel (RTFACCH) resource request message (RTRRM). In response to the RTRRM, the radio access network sends an RTFACCH resource assignment message (RTUAM). An interleaving scheme is also provided for half-rate mobile stations, in which one set of traffic frames are interleaved over plural bursts according to a first algorithm and a second set of traffic frames are interleaved over plural bursts according to a second algorithm.

Claims

1. A method of interleaving speech data communicated with a particular mobile station over a plurality of frames, comprising:

receiving, by a system from the particular mobile station in a communications session over a wireless channel, a first set of the speech data, wherein the first set of speech data has been interleaved by the particular mobile station according to a first algorithm over a first set of plural frames, wherein a first frame in the first set is spaced apart from a second frame in the first set by at least one other frame not in the first set; and

receiving, by the system from the particular mobile station in the communications session over the wireless channel, a second set of the speech data, wherein the second set of speech data has been interleaved by the particular mobile station according to a second, different algorithm over a second set of plural frames.

2. The method of claim 1, wherein the speech data interleaved according to the first or second algorithm comprises speech data interleaved over frames of a multiframe.

3. The method of claim 2, wherein interleaving over frames of the multiframe comprises interleaving over a General Packet Radio Service multiframe.

4. The method of claim 2, wherein the multiframe comprises plural blocks and each block comprises plural frames, each frame containing plural bursts, the speech data being carried in data frames interleaved over bursts in the plural frames, the method further comprising:

receiving an end-of-data indicating frame to indicate that a data frame is the last data frame, wherein the end-of-data indicating frame is interleaved according to predetermined algorithms,

wherein the data frames interleaved according to the first and second algorithms and the end-of-data indicating frame interleaved according to the predetermined algorithms enable the end-of-data indicating frame to end within the same block carrying the last data frame.

5. The method of claim 2, wherein the multiframe comprises plural blocks, each of the plural blocks having multiple frames.

6. The method of claim 5, wherein selection of interleaving according to the first algorithm or the second algorithm is based on which block of the multiframe a particular set of speech data starts on.

7. A method of interleaving speech data over a plurality of frames, comprising:

interleaving, by a half-rate mobile station, a first set of the speech data according to a first algorithm over a first set of plural frames for communication over a wireless channel in a communications session, wherein a first frame in the first set is spaced apart from a second frame in the first set by at least one other frame not in the first set;

interleaving, by the half-rate mobile station, a second set of the speech data according to a second, different algorithm over a second set of plural frames for communication over the wireless channel in the communications session; and

transmitting, by the half-rate mobile station, the interleaved first and second sets of speech data to a radio network over the wireless channel in the communications session.

8. The method of claim 7, wherein the first and second sets of speech data are interleaved over frames of a multiframe.

9. The method of claim 8, wherein the multiframe comprises plural blocks, each of the plural blocks having multiple frames.

10. The method of claim 9, further comprising:

selecting between using the first algorithm and the second algorithm to interleave a particular set of speech data based on which block of the multiframe a particular set of speech data starts on.

11. A system for communicating over a wireless channel in a mobile communications network, comprising:

an interface to receive speech data from a mobile station; and

at least one processor to;

process a first set of speech data that has been interleaved by the mobile station according to a first algorithm over a first set of plural frames, wherein a first frame in the first set is spaced apart from a second frame in the first set by at least one other frame not in the first set; and

process a second set of speech data that has been interleaved by the mobile station according to a second, different algorithm over a second set of plural frames.

12. The system of claim 11, wherein the speech data interleaved according to the first or second algorithm comprises speech data interleaved over frames of a multiframe.

13. The system of claim 12, wherein the multiframe comprises plural blocks, each of the plural blocks having multiple frames.

14. The system of claim 13, wherein selection of interleaving according to the first algorithm or second algorithm is based on which block of the multiframe a particular set of speech data starts on.