User's Manual

Mobile WiMAX Indoor RAS SPI-2210 System Description/Ed.07
© SAMSUNG Electronics Co., Ltd. 4-22
Classification Description
(1)~(4) The MS, in order to request a handover, sends the S-RAS (Serving RAS) an
MOB_MSHO-REQ message including the neighbor BS (RAS) ID and handover-
related parameters. The S-RAS sends the ACR an HO-Request message
including the received MOB_MSHO-REQ parameters and context information.
The ACR forwards the HO-Request message to the T-RAS (Target RAS).
(5)~(11) The T-RAS sends the ACR an HO-Response message including its own
capability information. The S-RAS sends the MS an MOB_BSHO-RSP message
including the Recommended Neighbor BS-IDs, HO-ID, and parameter results.
(12)~(18) The MS, in order to notify the final execution of the handover, sends the S-RAS
an MOB_HO-IND message including the HO-IND Type and Target BS-ID.
The S-RAS sends the T-RAS an HO-Confirm message including the context
information and data integrity information (e.g., the Buffered SDU SN) of the MS.
(19)~(22) The T-RAS sends a Context-Request message to the ACR (authenticator) to
obtain the AK Context information. The ACR responds with a Context-Response
message including the AK context information.
(23)~(28) The path pre-registration procedure is performed to set up a new data path
between the ACR and T-RAS. In addition, a forwarding path to transmit the traffic
that the S-RAS has not yet transmitted to the MS is set up to the T-RAS, and is
used to send that traffic to the T-RAS.
(29) In the event that the T-RAS requests an HO for the MS, it notifies the MS of the
UL_MAP IE so that the MS can send an HO Ranging Request message via the
uplink.
(30) The MS sends the T-RAS an RNG-REQ message including the MAC address,
Serving BS-ID, and HO Indication.
(31)~(36) The Path Registration procedure is performed to exchange the service flow (SF)
information to be mapped to the data path generated between the ACR and T-
RAS in steps (23)~(28).
(37) The T-RAS responds with an RNG-RSP message including the HO Optimization
flag and the CID_Update and SA-TEK_Update information.
(38) Once it has received the RNG-RSP message successfully, the MS sends a
bandwidth request (BR) MAC PDU to the RAS to notify it.
(39)~(41) The T-RAS sends an HO-Complete message to the S-RAS to notify the handover
is completed.
(42)~(45) The RAS sends the new CMAC_KEY_COUNT updated value for the MS to the
ACR which is the authenticator.
(46)~(47) When the handover procedure is completed, the previous path, i.e. the existing
path between the S-RAS and ACR, is released.