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Mobile WiMAX Indoor RAS SPI-2210 System Description/Ed.07
© SAMSUNG Electronics Co., Ltd. 2-5
Uplink
Collaborative SM (CSM)
Collaborative SM is the technology that doubles the frequency efficiency in view
of the indoor SPI-2210 as two MSs with each individual antenna send data
simultaneously by using the same channel.
Beamforming
The indoor SPI-2210 can carry out the following beamforming function later according to
Mobile WiMAX Wave 2 Profile: For the beamforming, the indoor SPI-2210 is designed on
the basis of 4Tx and 4Rx.
Downlink
DL dedicated pilots for Partial Usage of Subchannels (PUSC) and B-AMC (23)
Uplink
UL sounding channel (type A) with decimation and cyclic shift
UL PUSC and B-AMC (23)
The beamforming operation method following the Wave 2 Profile is as follows:
1) If an MS in a specific area transmits the sounding signal to the indoor SPI-2210, the
indoor SPI-2210 analyzes this signal.
2) The indoor SPI-2210 estimates an appropriate beamforming coefficient on the basis of
the result analyzed in step 1).
3) The indoor SPI-2210 carries out the beamforming for the uplink and the downlink.
Since the uplink and downlink channels have the high correlation in TDD method, the
beamforming can be supported.
2.2.2 Call Processing Function
Cell Initialization Function
The indoor SPI-2210 announces the MAC Management message such as DCD/UCD/
MOB_NBR-ADV to the cell area in service periodically to enable the MS receiving the
message to carry out the appropriate call processing function.
Call Control and Wireless Resource Allocation Function
The indoor SPI-2210 enables an MS to enter to or exit from the network. When an MS enters
to or exit from the network, the indoor SPI-2210 transmits/receives the signaling message
required for call processing via R1 interface with the MS or R6 interface with ACR.
The indoor SPI-2210 allocates various management/transport Connection Identifier (CID)
required for the network entry and service to a MS. When the MS exit from the network,
the indoor SPI-2210 collects and release the allocated CID.