Erased frame and idle frame suppression in a wireless communications system

• US 20070127413A1
• Filed: 12/01/2005
• Published: 06/07/2007
• Est. Priority Date: 12/01/2005
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Shahidi, Reza, Baglin, Vincent
• Granted Patent: US 7,376,102 B2
• Time in Patent Office: Days
• US Class Current: 370/331
• CPC Class Codes: H04W 28/0247 based on conditions of the access network or the infrastructure network central resource management H04W28/16
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 52/12 Outer and inner loops
• CPC Class Codes: H04W 52/143 Downlink power control
• CPC Class Codes: H04W 52/40 during macro-diversity or soft handoff
• CPC Class Codes: H04W 8/04 Registration at HLR or HSS [Home Subscriber Server]
• CPC Class Codes: H04W 92/12 between access points and access point controllers

Abstract

A method of reducing loading on backhaul communications links in a wireless communications system suppresses a portion of the upward flow of frame information for idle and/or erased frames in certain situations, such as when multiple ones of such frames are successively encountered. A radio base station abstains from sending a frame header to a BSC/ANC for second and following frames of the Idle type and/or the radio base station abstains from sending a frame header to a BSC/ANC for second and following frames of the Erased type. The header may also or alternatively be suppressed for an Idle frame immediately following a Good frame. The BSC/ANC in effect fills in the suppressed frame information in such situations, forwards appropriate indications of frame type to the frame selection algorithm.

Claims

1. A method of controlling frame forwarding operations of a first radio base station in a wireless communications system, comprising:

receiving first and second successive frames from a mobile station at said first radio base station, said second frame received after said first frame;

classifying said first and second frames at said first radio base station;

in response to both said first and second frames being classified differently, said first radio base station sending at least a header associated with said second frame to a call anchor associated with said mobile station;

said header indicating the classification of said second frame;

in response to both said first and second frames being classified as erased frames, said first radio base station abstaining from sending said header to said call anchor.

2. The method of claim 1 wherein if said second frame is classified as a good frame, said first radio station sending at least a header associated with said second frame to said call anchor comprises said first radio station sending said header and a payload associated with said second frame to said call anchor.

3. The method of claim 1 further comprising classifying said frames as idle frames if a frame boundary is encountered without receipt of corresponding frame transmissions from said mobile station.

4. The method of claim 1 further comprising, if both said first and second frames are classified as idle frames, said first radio base station abstaining from sending said header to said call anchor.

5. The method of claim 1 wherein classifying said first and second frames at said first radio base station comprises classifying said frames as either good, idle, or erased.

6. A method of controlling frame forwarding operations of a first radio base station in a wireless communications system, comprising:

classifying first and second frames associated with a mobile station at a first radio base station, said second frame immediately successive to said first frame;

in response to both said first and second frames being classified differently, said first radio base station sending at least a header associated with said second frame to a call anchor associated with said mobile station;

said header indicating the classification of said second frame;

in response to both said first and second frames being classified as idle frames, said first radio base station abstaining from sending said header to said call anchor.

7. The method of claim 6 wherein if said second frame is classified as a good frame, said first radio station sending at least a header associated with said second frame to said call anchor comprises said first radio station sending said header and a payload associated with said second frame to said call anchor.

8. The method of claim 6 further comprising classifying said frames as idle frames if a corresponding frame boundary is encountered without receipt of corresponding frame transmissions from said mobile station.

9. The method of claim 6 wherein classifying said first and second frames at said first radio base station comprises classifying said frames as either good, idle, or erased.

10. A method of controlling frame forwarding operations of a first radio base station in a wireless communications system;

said first radio base station having at least an idle frame state;

a good frame state, and an erased frame state;

said method comprising;

receiving a reverse link frame from a mobile station at the first radio base station while the first radio base station is in said erased frame state;

classifying said received frame by said first radio base station;

in response to said received frame being classified as a good frame, said first radio base station sending said received frame and a header to a call anchor associated with said mobile station and transitioning to said good frame state;

in response to said received frame being classified as an erased frame, said first radio base station abstaining from sending said frame to said call anchor and abstaining from sending said header to said call anchor, and further remaining in said erased frame state;

in response to said received frame being classified as an idle frame, said first radio base station sending said header to said call anchor but abstaining from sending said frame to said call anchor;

said header comprising an idle indication; and

further transitioning to said idle frame state.

11. The method of claim 10 wherein said classifying said received frame comprises classifying said received frame as idle if a frame boundary is encountered without receipt of corresponding frame transmissions from said mobile station.

12. A method of controlling frame forwarding operations of a first base station in a wireless communications system;

said base station having at least an idle frame state;

a good frame state, and an erased frame state;

said method comprising;

receiving a reverse link packet from a mobile station at said first base station while first said base station is in said idle frame state;

classifying said received frame;

in response to said received frame being classified as a good frame, said first base station sending said received frame and a header to a call anchor associated with said mobile station and transitioning to said good frame state;

in response to said received frame being classified as an erased frame, said first base station abstaining from sending said frame to said call anchor but sending said header to said call anchor;

said header comprising an erasure indication; and

further transitioning to said erased frame state;

in response to said received frame being classified as an idle frame, said first base station abstaining from sending said frame to said call anchor, abstaining from sending said header to said call anchor, and remaining in said idle state.

13. A method of supplying frame classification information by an anchor base station to a frame selection algorithm, said anchor base station having at least an idle frame receipt state;

a good frame receipt state, and an erased frame receipt state;

said method comprising;

in response to being in said idle frame receipt state and receiving neither a frame nor a header from said first radio base station at a frame boundary, said anchor base station supplying an indication, corresponding to said first base station, to said frame selection algorithm indicating an idle frame and remaining in said idle frame receipt state; and

in response to being in said erased frame receipt state and receiving neither a frame nor a header from a first radio base station at a frame boundary, said anchor base station supplying an indication, corresponding to said first base station, to said frame selection algorithm indicating an erased frame and remaining in said erased frame receipt state.

14. The method of claim 13 further comprising said anchor base station supplying an indication, corresponding to said first base station, to said frame selection algorithm indicating an idle frame and transitioning to said idle frame receipt state in response to being in said good frame receipt state and receiving neither a frame nor a header from a first radio base station at a frame boundary.

15. The method of claim 13 further comprising said anchor base station:

supplying an indication, corresponding to said first base station, to said frame selection algorithm indicating a good frame and remaining in said good frame receipt state in response to being in said good frame receipt state and receiving a good frame indication;

supplying an indication, corresponding to said first base station, to said frame selection algorithm indicating an idle frame and transitioning to said idle frame receipt state in response to being in said good frame receipt state and receiving neither a frame nor a header from a first radio base station at a frame boundary;

supplying an indication, corresponding to said first base station, to said frame selection algorithm indicating an erased frame and transitioning to said erased frame receipt state in response to being in said good frame receipt state and receiving an erased frame indication;

supplying an indication, corresponding to said first base station, to said frame selection algorithm indicating a good frame and transitioning to said good frame receipt state in response to being in said erased frame receipt state and receiving a good frame indication;

supplying an indication, corresponding to said first base station, to said frame selection algorithm indicating an idle frame and transitioning to said idle frame receipt state in response to being in said erased frame receipt state and receiving an idle frame indication;

supplying an indication, corresponding to said first base station, to said frame selection algorithm indicating a good frame and transitioning to said good frame receipt state in response to being in said idle frame receipt state and receiving a good frame indication; and

supplying an indication, corresponding to said first base station, to said frame selection algorithm indicating an erased frame and transitioning to said erased frame receipt state in response to being in said idle frame receipt state and receiving an erased frame indication.

16. A radio base station for a wireless communications system, comprising:

a receiver operative to receive first and second frames from a mobile station on a reverse link;

said second frame immediately successive to said first frame;

one or more processing circuits operatively coupled to said receiver and configured to;

classify said first and second frames;

send at least a header associated with said second frame to a call anchor associated with said mobile station in response to both said first and second frames being classified differently;

said header indicating the classification of said second frame;

abstain from sending said header to said call anchor in response to both said first and second frames being classified as idle frames.

17. The radio base station of claim 16 wherein said one or more processing circuits are further configured to, if said second frame is classified as a good frame, send said header and a payload associated with said second frame to said call anchor.

18. The radio base station of claim 16 wherein said one or more processing circuits are further configured to classify said frames as idle frames if a corresponding frame boundary is encountered without receipt of corresponding frame transmissions from said mobile station.

19. The radio base station of claim 16 wherein said one or more processing circuits are further configured to classify said first and second frames as either good, idle, or erased.

20. A radio base station for a wireless communications system, comprising:

a receiver operative to receive first and second frames from a mobile station on a reverse link;

said second frame immediately successive to said first frame;

one or more processing circuits operatively coupled to said receiver and configured to;

classify said first and second frames;

send at least a header associated with said second frame to a call anchor associated with said mobile station in response to both said first and second frames being classified differently;

said header indicating the classification of said second frame;

abstain from sending said header to said call anchor in response to both said first and second frames being classified as erased frames.

21. An anchor base station in a wireless communications system, comprising:

at least a first radio base station operative to receive reverse link transmissions from a plurality of mobile stations, including at least a first mobile station;

one or more processing circuits operatively coupled to said radio base station and configured to;

track a frame receipt state associated with said first mobile station between at least an idle frame receipt state;

a good frame receipt state, and an erased frame receipt state;

supply an indication, corresponding to said first radio base station, to a frame selection algorithm indicating an erased frame in response to being in said erased frame receipt state and receiving neither a frame nor a header from said radio base station at a frame boundary; and

supply an indication, corresponding to said first radio base station, to a frame selection algorithm indicating an idle frame in response to being in said idle frame receipt state and receiving neither a frame nor a header from said radio base station at a frame boundary.

22. The method of claim 21 wherein said one or more processing circuits are further configured to:

supply an indication, corresponding to said first radio base station, to a frame selection algorithm indicating an idle frame in response to being in said good frame receipt state and receiving neither a frame nor a header from said radio base station at a frame boundary.

23. A method of controlling frame forwarding operations of a first radio base station in a wireless communications system, comprising:

receiving first and second successive frames from a mobile station at said first radio base station, said second frame received after said first frame;

classifying said first and second frames at said first radio base station;

in response to both said first and second frames being classified differently, said first radio base station;

if said second frame is other than an idle frame, sending at least a header associated with said second frame to a call anchor associated with said mobile station;

said header indicating the classification of said second frame;

if said second frame is an idle frame and said first frame is an erased frame, sending said header to said call anchor;

said header indicating the classification of said second frame;

if said second frame is an idle frame and said first frame is a good frame, abstaining from sending said header to said call anchor;

in response to both said first and second frames being classified as idle frames, said first radio base station abstaining from sending said header to said call anchor.

24. A method of supplying frame classification information by an anchor base station to a frame selection algorithm, said anchor base station having at least an idle frame receipt state;

a good frame receipt state, and an erased frame receipt state;

said method comprising;

in response to being in said good frame receipt state and receiving neither a frame nor a header from said first radio base station at a frame boundary, said anchor base station supplying an indication, corresponding to said first base station, to said frame selection algorithm indicating an idle frame and transitioning to said idle frame receipt state;

in response to being in said idle frame receipt state and receiving neither a frame nor a header from said first radio base station at a frame boundary, said anchor base station supplying an indication, corresponding to said first base station, to said frame selection algorithm indicating an idle frame and remaining in said idle frame receipt state.