We claim:
1. A method (600) for a mobile Station (105) capable of sending event-based acknowledgment
information (250; 258), the method comprising:
classifying (605) a downlink data block (175) as unreported;
receiving (610) a poll from a network (110) requesting the mobile Station (105) to send polled acknowledgment information (250; 258) during a period;
sending (655) during the period the event-based acknowledgment information (250; 258) for the downlink data block (175), when an acknowledgment Omission criterion (655) indicates the polled acknowledgment information (215; 230) is likely to not be received completely by the network (110) during the period; and
refraining from sending (665) during the period event-based acknowledgment (250; 258) information for the downlink data block (175) classified as unreported, when the acknowledgment Omission criterion (655) indicates the polled acknowledgment information (215; 230) is likely to be received completely by the network (110) during the period.
2. A method (600) as claimed in claim 1, wherein the acknowledgment Omission criterion (655) indicates that the polled acknowledgment information (215; 230) is likely to not be received completely by the network (110) when an estimated uplink Channel quality is less than a threshold, and indicates that the polled acknowledgment information (215; 230) is likely to be received completely by the network (110) when the estimated uplink Channel quality is greater than or equal to the threshold.
3. A method (600) as claimed in claim 1 wherein the acknowledgment Omission criterion (655) indicates that the polled acknowledgment information (215; 230) is likely to not be received completely by the network (110) when an estimated uplink Channel quality is less than a threshold and the polled acknowledgment information comprises a piggybacked ACK/NACK (PAN) field (215) to be sent by the mobile Station (105) according to an enhanced general packet radio Service (EGPRS) polled fast ACK/NACK reporting (FANR) procedure, and wherein the acknowledgment Omission criterion (655) indicates that the polled acknowledgment information (215; 230) is likely to be received completely by the network (110) when the estimated uplink Channel quality is greater than or equal to the threshold, or the polled acknowledgment information (215; 230) comprises an ACK/NACK field to be sent by the mobile Station in an EGPRS ACK/NACK control message (230).
4. A method (600) as claimed in claim 1 wherein the acknowledgment Omission criterion (655) indicates that the polled acknowledgment information (215; 230) is likely to not be received completely by the network (110) when a remaining amount of acknowledgment information to send is greater than or equal to a threshold, and indicates that the polled acknowledgment information (215; 230) is likely to be received completely by the network

(110) when the remaining amount of acknowledgment Information to send is less than the threshold.
5. A method (600) as claimed in claim 1 wherein the acknowledgment Omission criterion (655) indicates that the polled acknowledgment information (215; 230) is likely to not be received completely by the network (110) when a downlink Channel assignment is greater than or equal to a threshold, and indicates that the polled acknowledgment information (215; 230) is likely to be received completely by the network (110) when the downlink Channel assignment is less than the threshold.
6. A method (600) as claimed in claim 1 wherein the event-based acknowledgment information (250; 258) comprises a PAN field (250) according to an EGPRS event-based FANR procedure or an ACK/NACK field in an EGPRS ACK/NACK control message.
7. A method as claimed in claim 1 wherein the polled acknowledgment information comprises at least one of a piggy-backed ACK/NACK (PAN) field or an ACK/NACK field in an EGPRS ACK/NACK control message (258).
8. A method (600) as claimed in claim 1 wherein classifying the downlink data block as unreported comprises setting an element of a receive State array to an unreported State, the element corresponding to the downlink data block.
9. A method (600) as claimed in claim 1, wherein the mobile Station (105) refrains from sending during the period event-based acknowledgment information (250; 258).
10. A method (600) as claimed in claim 1, wherein the mobile Station (105) refrains from sending event-based acknowledgment information (250; 258) for the downlink data block (175) classified as unreported.
11. A method (600) as claimed in claim 1, wherein the polled acknowledgement information (215; 230) includes acknowledgement information for the downlink data block (175) classified as unreported.
12. A method (600) as claimed in claim 1, wherein the period is one radio block period.
13. A mobile Station (105) comprising:
an event-based acknowledgment processor (245) to generate event-based acknowledgment information (250; 258) for a downlink data block (175) classified as unreported;

a polled acknowledgment processor (240) to generate polled acknowledgment Information (215; 230) in response to a poll (210; 225) requesting the mobile Station to send poll acknowledgment information during a period, received from a network (110); and
an acknowledgment transmission unit (260) to send the event-based acknowledgment information (250; 258) during the period, when an acknowledgement Omission criterion (655) indicates the polled acknowledgment information (215; 230) is likely to not be received completely by the network (110) during the period; and to refrain from sending the event-based acknowledgment information (250; 258) during the period, when the acknowledgment Omission criterion (655) indicates the polled acknowledgment information (215; 230) is likely to not be received completely by the network (110) during the period.
14. A mobile Station (105) as claimed in claim 13 wherein the acknowledgment transmission unit (260) is to determine that the polled acknowledgment information (215; 230) has a likelihood of not being received completely by the network (110) when an estimated uplink Channel quality is less than a threshold, and the acknowledgment transmission unit (260) is to determine that the polled acknowledgment information (215; 230) has a likelihood of being received completely by the network (110) when the estimated uplink Channel quality is greater than or equal to the threshold.
15. A mobile Station (105) as claimed in claim 14 wherein the acknowledgment transmission unit (260) is to determine that the polled acknowledgment information (215; 230) has a likelihood of not being received completely by the network (110) when an estimated uplink Channel quality is less than a threshold and the polled acknowledgment information (215; 230) generated by the polled acknowledgment processor (240) comprises a piggy-backed ACK/NACK (PAN) field (215) to be sent by the mobile Station (105) according to an enhanced general packet radio Service (EGPRS) polled fast ACK/NACK reporting (FANR) procedure, and the acknowledgment transmission unit (260) is to determine that the polled acknowledgment information (215; 230) as a likelihood of being received completely by the network (110) when the estimated uplink Channel quality is greater than or equal to the threshold, or the polled acknowledgment information (215; 230) generated by the polled acknowledgment processor (240) comprises an ACK/NACK field to be sent by the mobile Station in an EGPRS ACK/NACK control message (230).
16. A mobile Station (105) as claimed in claim 14 wherein the acknowledgment transmission unit (260) is to determine that the polled acknowledgment information (215; 230) is likely not to be received completely by the network (110) when a remaining amount of acknowledgment information to send is greater than or equal to a threshold, and the acknowledgment transmission unit (260) is to determine that the polled acknowledgment

Information (215; 230) has a likelihood of being received completely by the network (110) when the remaining amount of acknowledgment Information to send is less than the threshold.
17. A mobile Station (105) as claimed in claim 16 wherein the acknowledgment transmission unit (260) is to determine that the polled acknowledgment information (215; 230) has a likelihood of not being received completely by the network (110) when a downlink Channel assignment is greater than or equal to a threshold, and the acknowledgment transmission unit (260) is to determine that the polled acknowledgment information (215; 230) has a likelihood of being received completely by the network (110) when the downlink Channel assignment is less than the threshold.
18. A method (600) for a mobile Station (105) configured to send event-based acknowledgment information (250; 258), the method comprising:
classifying (605) a downlink data block (175) as unreported;
determining if a poll is received from a network (110) requesting the mobile Station (105) to send polled acknowledgment information (215; 230) during a period; and
if a poll is received, sending during the period polled acknowledgment
information, or if a poll is not received, sending during the period event-based acknowledgment information (215; 230) for the downlink data block (175) classified as unreported.
19. A mobile Station (105) configured to send event-based acknowledgment information (250;
258), the mobile Station (105) comprising:
a processor, the processor being configured to:
classify a downlink data block (175) as unreported;
determine if a poll is received from a network (110) requesting the mobile Station (105) to send polled-acknowledgment information (215; 230) during a period; and
if a poll is received, send during the period polled acknowledgment information (215; 230), or if a poll is not received, send during the period event-based acknowledgment information (250; 258) for the downlink data block classified as unreported.