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802.16 2005, section
8.3.5 states: The BS shall transmit DL bursts intended for an SS such that the end of any DL burst shall not be transmitted to
the SS later than (SSRTG+RTD) before its scheduled uplink and the beginning of any DL burst to
the SS shall not be transmitted to the SS earlier than (SSTTG RTD) after the
end of its scheduled uplink allocation, where RTD denotes Round-Trip Delay. The
parameters SSRTG and SSTTG are capabilities provided by the SS to BS upon
request during network entry (see 11.8.3.1). My Questions 1) Does the above paragraph say: The SS can start
transmitting before the last symbol of the BTS DL Frame has arrived? Say a particular mobile (SS) is a long way from the
BTS and needs to start its UL transmission early, can it transmit before the
last symbol (destined to another SS) has arrived? In other words, it is possible to extend the RTD
(round trip delay) if the SS(s) filling the first 3 UL symbols (tile
structure), a) receives all its DL
data in the first few DL symbols; and b) is allowed to commence
transmitting before the last DL symbol has arrived. Can you confirm the last statement follows from
section 8.3.5 ? 2) If the UL/DL symbol ratio is such that the number of
DL payload symbols is an odd number, in the case of PUSC where the payload is
arranged into 2-symbol wide clusters, is there any payload in the last (odd)
symbol? In this case, at the end of the DL frame only one
symbol is available and no 14x2 subcarrier cluster can be formed. Is payload
sent in a 1-symbol cluster or is the symbol discarded? If yes, the TTG would be ~100 us longer (TTG = 105us
+ one symbol duration) for a 10MHz WiMAX Forum bandclass 3 case. Thank You, W.Oberhammer |