Sleep mode control for real-time services in broadband wireless access communication systems

摘要

Consideration of Quality of Service is taken into account during the establishment of a sleep cycle in a mobile station providing real-time services. Upon the mobile station's identification of a need for a real-time service to enter into sleep mode, a request conveying that need is sent to the base station. The base station replies with a start frame number and other sleep parameters. Thereafter the mobile station enters sleep mode comprising sleep intervals interleaved with listening intervals. To prevent transmission packets from being buffered at the mobile station for an excessive period of time due to attempts to transmit packets to the base station during a sleep interval, the length of the sleep interval is set so as not to exceed the maximum latency value reflecting the QoS of the real-time service negotiated during establishment of the real-time services.

主权项

1. A computer implemented method for controlling sleep modes used with broadband wireless access communication system's real-time services, the method comprising:
establishing wireless service between a base station and a mobile station wherein the base station and the mobile station set a maximum latency value required while running each real-time service; receiving at the base station a sleep request from the mobile station to enter into a sleep mode wherein the sleep request identifies sleep parameters; sending from the base station to the mobile station a sleep response selecting sleep parameters wherein sleep parameters include a start frame number for a sleep interval and a power savings class; initiating the sleep interval at the mobile station at the start frame number wherein the sleep interval is set according to the power savings class and according to the maximum latency value for each real-time service; responsive to the completion of the sleep interval, initiating a listening interval at the mobile station according to the power savings class; synchronizing the listening interval of the mobile station with packet transmission from the mobile station; and responsive to the base station transmitting to the mobile station during the listening interval at the mobile station, terminating the sleep mode and resuming normal operations.