Apparatus and method for transmitting system information block in a broadband wireless communication system
An operation method of the femto BS includes configuring a subframe set including at least two types of subframes among subframes having predefined different structures, and, if a duration of a subframe carrying the subframe set arrives, transmitting one of the subframes included in the subframe set according to predefined order. The subframes having the predefined different structures include a first type subframe including a synchronization signal and a Master Information Block (MIB), a second type subframe including the synchronization signal, a third type subframe including the synchronization signal and system information, a fourth type subframe including the synchronization signal, the MIB, and the system information, and a fifth type subframe including the system information.
1. An operation method of a femto Base Station (BS) in a wireless communication system supporting a femtocell, the method comprising:
configuring a subframe set comprising at least two types of subframes among subframes having predefined different structures; and
if a duration of a subframe carrying the subframe set arrives, transmitting one of the subframes comprised in the subframe set according to predefined order, wherein the duration is discontinuously distributed in a frame and no subframe is transmitted in a period other than the duration,
wherein the subframes having the predefined different structures comprise:
a first type subframe comprising a synchronization signal and a Master Information Block (MIB);
a second type subframe comprising the synchronization signal;
a third type subframe comprising the synchronization signal and system information;
a fourth type subframe comprising the synchronization signal, the MIB, and the system information; and
a fifth type subframe comprising the system information, and
wherein the synchronization signal included in the subframe set is the same, in a physical layer structure, as a synchronization signal transmitted through an operation frequency band of the femtocell BS, and
wherein the subframe set is transmitted during preset burst duration every preset system information transmission period, and the system information transmission period and the burst duration are defined in a unit of frame.
2. The method of claim 1 , wherein the duration of a subframe carrying the subframe set arrives over a period of duration of five subframes.
3. The method of claim 1 , wherein the system information comprises at least one of a plurality of parameters shown in a Table:
Parameter
Content
plmn-IdntitList
PLMN (Public Land Mobile Network) identity list. The PLMN
means one mobile communication service provider.
Cell Identity
Identity on cell of BS
CSG Idication
Indication representing if cell of BS transmitting system
information is cell applying CSG (Closed Subscriber Group).
CSG Identity
Identity representing CSG mode. The CSG mode comprises at least
one of open mode, close mode, and hybrid mode.
RAT-indicator
Identity indicating Radio Access Technology (RAT) of BS
transmitting system information.
hybrid-access-mode
Identity indicating hybrid access mode of BS transmitting system
indicator
information.
TDD-indicator
Identity distinguishing duplex schemes of BS transmitting system
information.
dl-CarrierFreqInfo
DL operation frequency information of BS transmitting system
information.
Low-duty-mode-
Identity representing current operation mode of BS transmitting
indicator
system information. The operation mode is distinguished into first
mode generally operating and second mode discontinuing partial
function for power control.
ul-CarrierFreqInfo
UL operation frequency information of BS transmitting system
information. Including only in case of operating in Frequency-
Division Duplex (FDD).
SwitchingTimeInfo
DL/UL switching time information. Including only in case of
operating in Time-Division Duplex (TDD).
RACH-
Preamble information necessary for random accessing BS
preambleInfo
transmitting system information.
SIBx_transmission —
Configuration information including period of transmission of
subframe_set_conf
subframe set, burst duration information, i.e., duty cycle of burst
duration, information on whether current SIBx is n th subframe
among subframe set (or among burst duration) or timing
information at which next subframe set will be transmitted, SIBx
contents change identifying counter, etc.
tracking area code
Code of tracking area to which BS transmitting system information
belongs. The tracking area means a bundle of BSs used for call of
MS.
4. The method of claim 3 , wherein the subframes included in the subframe set are transmitted at an operation frequency band of an upper BS of the femto BS.
5. The method of claim 4 , wherein the system information has the same structure as the MIB, and is CRC-processed using a Cyclic Redundancy Check (CRC) mask representing the system information.
6. The method of claim 4 , wherein the subframes comprised in the subframe set are transmitted through a system information transmission duration assigned by the upper BS or an upper network element.
7. The method of claim 1 , wherein the subframes comprised in the subframe set each comprise a control channel at a start portion of the subframe.
8. The method of claim 1 , wherein the system information comprises a System Information Block (SIB) for the femto BS, and the MIB comprises system information for an upper BS.
9. An operation method of a Base Station (BS) in a wireless communication system, the method comprising:
configuring a subframe set comprising at least two types of subframes among subframes having predefined different structures; and
transmitting one of each of the subframes comprised in the subframe set according to predefined order in every five subframes, wherein no subframe is transmitted in a period other than the every five subframes, a duration of the every five subframes being discontinuously distributed in a frame,
wherein the subframes having the predefined different structures comprise:
a first type subframe comprising a synchronization signal and a Master Information Block (MIB);
a second type subframe comprising the synchronization signal;
a third type subframe comprising the synchronization signal, the MIB, and reference signals;
a fourth type subframe comprising the synchronization signal and the reference signals; and
a fifth type subframe comprising system information, and
wherein the subframe set is transmitted during preset burst duration every preset system information transmission period, and the system information transmission period and the burst duration are defined in a unit of frame.
10. The method of claim 9 , wherein the subframe set comprises a single first type subframe and a single second type subframe, and
wherein the transmitting of one of the subframes comprised in the subframe set according to the predefined order comprises alternately transmitting the first type subframe and the second type subframe in every five subframes.
11. The method of claim 10 , wherein the subframe set comprising the single first type subframe and the single second type subframe is used in one of a case where no MS has access to the BS and a case where at least one MS does not perform communication although being in access to the BS.
12. The method of claim 11 , further comprising transmitting system information through one of the first type subframe and the second type subframe.
13. The method of claim 11 , further comprising transmitting the fifth type subframe according to a period independent of a period of transmission of the subframe set.
14. The method of claim 11 , further comprising:
periodically transmitting system information through one of the first type subframe and the second type subframe; and
transmitting the fifth type subframe according to a period independent of a period of transmission of the subframe set.
15. The method of claim 9 , wherein the subframe set comprises a single third type subframe and a single fourth type subframe, and
wherein the transmitting of one of the subframes comprised in the subframe set according to the predefined order comprises alternately transmitting the third type subframe and the fourth type subframe over in every five subframes.
16. The method of claim 15 , wherein the subframe set comprising the single third type subframe and the single fourth type subframe is used in one of a case where no MS has access to the BS and a case where at least one MS does not perform communication although being in access to the BS.
17. A femto Base Station (BS) apparatus in a wireless communication system supporting a femtocell, the apparatus comprising:
a controller configured to configure a subframe set comprising at least two types of subframes among subframes having predefined different structures; and
a transmitter configured to, if a duration of a subframe carrying the subframe set arrives, transmit one of the subframe s comprised in the subframe set according to predefined order, wherein the duration is discontinuously distributed in a frame and no subframe is transmitted in a period other than the duration,
wherein the subframes having the predefined different structures comprise:
a first type subframe comprising a synchronization signal and a Master Information Block (MIB);
a second type subframe comprising the synchronization signal;
a third type subframe comprising the synchronization signal and system information;
a fourth type subframe comprising the synchronization signal, the MIB, and the system information; and
a fifth type subframe comprising the system information, and
wherein the synchronization signal included in the subframe set is the same, in a physical layer structure, as a synchronization signal transmitted through an operation frequency band of a femtocell BS, and
wherein the controller is configured to transmit the subframe set during a preset burst duration every preset system information transmission period, and the system information transmission period and the burst duration are defined in a unit of frame.
18. The apparatus of claim 17 , wherein the duration of a subframe carrying the subframe set arrives over a period of duration of five subframes.
19. The apparatus of claim 18 , wherein the system information comprises at least one of a plurality of parameters shown in a Table:
Parameter
Content
plmn-IdntitList
PLMN (Public Land Mobile Network) identity list. The PLMN
means one mobile communication service provider.
Cell Identity
Identity on cell of BS
CSG Idication
Indication representing if cell of BS transmitting system
information is cell applying CSG (Closed Subscriber Group).
CSG Identity
Identity representing CSG mode. The CSG mode comprises at least
one of open mode, close mode, and hybrid mode.
RAT-indicator
Identity indicating Radio Access Technology (RAT) of BS
transmitting system information.
hybrid-access-mode
Identity indicating hybrid access mode of BS transmitting system
indicator
information.
TDD-indicator
Identity distinguishing duplex schemes of BS transmitting system
information.
dl-CarrierFreqInfo
DL operation frequency information of BS transmitting system
information.
Low-duty-mode-
Identity representing current operation mode of BS transmitting
Indicator
system information. The operation mode is distinguished into first
mode generally operating and second mode discontinuing partial
function for power control.
ul-CarrierFreqInfo
UL operation frequency information of BS transmitting system
information. Including only in case of operating in Frequency-
Division Duplex (FDD).
SwitchingTimeInfo
DL/UL switching time information. Including only in case of
operating in Time-Division Duplex (TDD).
RACH-
Preamble information necessary for random accessing BS
preambleInfo
transmitting system information.
SIBx_transmission —
Configuration information including period of transmission of
subframe_set_conf
subframe set, burst duration information, i.e., duty cycle of burst
duration, information on whether current SIBx is n th subframe
among subframe set (or among burst duration) or timing
information at which next subframe set will be transmitted, SIBx
contents change identifying counter, etc.
tracking area code
Code of tracking area to which BS transmitting system information
belongs. The tracking area means a bundle of BSs used for call of
MS.
20. The apparatus of claim 19 , wherein the subframes included in the subframe set are transmitted at an operation frequency band of an upper BS of the femto BS.
21. The apparatus of claim 20 , wherein the system information has the same structure as the MIB, and is CRC-processed using a Cyclic Redundancy Check (CRC) mask representing the system information.
22. The apparatus of claim 17 , wherein the subframes comprised in the subframe set are transmitted through a system information transmission duration assigned by the upper BS.
23. The apparatus of claim 17 , wherein the subframes comprised in the subframe set each comprise a control channel at a start portion of the subframe.
24. The apparatus of claim 17 , wherein the system information comprises a System Information Block (SIB) for the femto BS, and wherein the MIB comprises system information for an upper BS.
25. A Base Station (BS) apparatus in a wireless communication system, the apparatus comprising:
a controller configured to configure a subframe set comprising at least two types of subframes among subframes having predefined different structures; and
a transmitter configured to transmit one of each of the subframes comprised in the subframe set according to predefined order in every five subframes, wherein no subframe is transmitted in a period other than the every five subframes, a duration of the every five subframes being discontinuously distributed in a frame,
wherein the subframes having the predefined different structures comprise:
a first type subframe comprising a synchronization signal and a Master Information Block (MIB);
a second type subframe comprising the synchronization signal;
a third type subframe comprising the synchronization signal, the MIB, and reference signals;
a fourth type subframe comprising the synchronization signal and the reference signals; and
a fifth type subframe comprising system information, and
wherein the subframe set is transmitted during preset burst duration every preset system information transmission period, and the system information transmission period and the burst duration are defined in a unit of frame.
26. The apparatus of claim 25 , wherein the subframe set comprises a single first type subframe and a single second type subframe, and
wherein the controller is configured to alternately transmit the first type subframe and the second type subframe in every five subframes.
27. The apparatus of claim 26 , wherein the subframe set comprising the single first type subframe and the single second type subframe is used in one of a case where no MS has access to the BS and a case where at least one MS does not perform communication although being in access to the BS.
28. The apparatus of claim 25 , wherein the subframe set comprises a single third type subframe and a single fourth type subframe, and
wherein the controller is configured to alternately transmit the third type subframe and the fourth type subframe in every five subframes.
29. The apparatus of claim 28 , wherein the subframe set comprising the single third type subframe and the single fourth type subframe is used in one of a case where no MS has access to the BS and a case where at least one MS does not perform communication although being in access to the BS.