Air link up/down protocol (ALUDP)
An air link up/down protocol (ALUDP) may be Synchronized ALUDP (S-ALUPD) or Non-Synchronized ALUDP (NS-ALUDP). A method for wireless communications includes monitoring and managing the air link status between a Subscriber Station (SS) and a Base Station (BS).
1. A method for detecting coverage loss at a base station (BS), the method comprising:
starting a coverage loss detection (CLD) timer for a subscriber station (SS) to perform a CLD procedure;
on a condition that the CLD timer for the SS expires during the CLD procedure:
allocating an uplink (UL) grant to the SS to enable identification of the status of the SS during the CLD procedure;
receiving an UL data burst from the SS via the allocated UL grant during the CLD procedure;
resetting the CLD timer for the SS based on the received UL data burst from the SS during the CLD procedure; and
transmitting an unsolicited unicast ranging acknowledgement (RNG-ACK) to the SS based on the received UL data burst from the SS during the CLD procedure, wherein the unsolicited unicast RNG-ACK enables the SS, which has previously started a periodic ranging timer associated with a periodic ranging procedure, to reset the periodic ranging timer.
2. The method of claim 1 , wherein the CLD timer for the SS is started upon an initial network entry of the SS.
3. The method of claim 1 , wherein the CLD timer for the SS is started upon a network reentry of the SS.
4. The method of claim 1 , wherein the UL data burst includes identification information of the SS.
5. The method of claim 1 , further comprising:
determining whether an UL transmission parameter adjustment is required.
6. The method of claim 1 , further comprising:
on a condition that the CLD timer for the SS expires during a scanning interval of the SS:
deferring allocating an uplink (UL) grant to the SS to identify the status of the SS to a next available interleaving interval of the SS.
7. The method of claim 6 , further comprising:
detecting the next available interleaving interval of the SS.
8. A base station (BS) configured to detect coverage loss, the BS comprising:
a coverage loss detection (CLD) timer capable of being started for a subscriber station (SS) to perform a CLD procedure;
a transmitter configured to allocate an uplink (UL) grant to the SS to enable identification of the status of the SS during the CLD procedure;
a receiver configured to receive an UL data burst from the SS via the allocated UL grant during the CLD procedure;
a processor configured to reset the CLD timer for the SS based on the received UL data burst from the SS during the CLD procedure; and
the transmitter further configured to transmit an unsolicited unicast ranging acknowledgement (RNG-ACK) to the SS based on the received UL data burst from the SS during the CLD procedure, wherein the unsolicited unicast RNG-ACK enables the SS, which has previously started a periodic ranging timer associated with a periodic ranging procedure, to reset the periodic ranging timer.
9. The BS of claim 8 , wherein the CLD timer for the SS is started upon an initial network entry of the MS.
10. The BS of claim 8 , wherein the CLD timer for the MS is started upon a network reentry of the MS.
11. The BS of claim 8 , wherein the UL data burst includes identification information of the SS.
12. The BS of claim 8 , wherein the processor is further configured to determine whether an UL transmission parameter adjustment is required.
13. The BS of claim 8 , wherein the transmitter is further configured to defer allocating an uplink (UL) grant to the SS to identify the status of the SS to a next available interleaving interval of the SS on a condition that the CLD timer for the SS expires during a scanning interval of the SS.
14. The BS of claim 13 , wherein the receiver is further configured to detect the next available interleaving interval of the SS.