CN102754363B - During sleep pattern, method and the mobile station apparatus of coverage loss operation is effectively performed in BWA - Google Patents
During sleep pattern, method and the mobile station apparatus of coverage loss operation is effectively performed in BWA Download PDFInfo
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- 238000005457 optimization Methods 0.000 claims description 14
- 238000005259 measurement Methods 0.000 claims description 13
- 238000013468 resource allocation Methods 0.000 claims description 11
- 238000001514 detection method Methods 0.000 claims description 6
- 230000002618 waking effect Effects 0.000 claims 2
- 238000012360 testing method Methods 0.000 abstract description 3
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
A kind of for detecting the method for coverage loss and the equipment for performing the method during the sleep pattern of mobile radio station.Method for the coverage loss detecting the mobile radio station operated in sleep pattern in BWA comprises step: the sleeping window when the very first time and sleep cycle of launching super frame header (SFH) from serving BS is independently revived; Detect this super frame header; Further, if testing result is successfully, come in sleeping window or audit window operation according to sleep cycle, and, if testing result is unsuccessfully, wake until successfully super frame header detected.
Description
This application claims the rights and interests of the korean patent application No.10-2010-0105885 submitted on October 28th, 2010, this korean patent application is comprised in this by reference, as fully explained at this.
The application also requires the U.S. Provisional Application No.61/302 submitted on February 8th, 2010, and the rights and interests of 478, its content is contained entirely in this by reference.
Technical field
The present invention relates to BWA, and relate more specifically to a kind of for detecting the method for coverage loss and the equipment for performing the method during the sleep pattern of mobile radio station.
Background technology
It is important for making the mobile radio station of the power supply in order to mobility with the battery depended on reduce power consumption.In this respect, the various methods for reducing power consumption have been proposed.One of the method is sleep pattern.
Sleep pattern to refer to stop with base station not used for the operation of the mobile radio station of the flow transmitted and received to reduce power consumption.
If the mobile radio station carrying out communicating in normal mode or activity pattern with base station no longer has the flow for transmitting and receiving with base station, then it is to Base Transmitter Sleep Request (MOB_SLP-REQ or AAI_SLP-REQ) message, to enter a sleep mode.Sleep response (MOB_SLP-RSP or AAI_SLP-RSP) is launched to mobile radio station in the base station having received sleep response message, wherein, sleep response message comprises the parameter relevant to the sleep pattern of mobile radio station, such as initial sleep cycle and audit window (LW).
The mobile radio station having received sleep response message enters sleep pattern by using the parameter relevant to sleep pattern.
Mobile radio station alternately repeats sleep interval and listening intervals.Mobile radio station can receive data at listening intervals to Base Transmitter data with from base station.Because mobile radio station can not receive data to Base Transmitter data with from base station, so be buffered in the data of sleep interval to Base Transmitter at sleep interval.
With reference to Fig. 1, above-mentioned sleep mode operation is described in more detail.
Fig. 1 is the figure of the example of the sleep mode operation process of the mobile radio station be shown in common IEEE 802.16 system.
See Fig. 1, when mobile radio station is changed from normal mode to sleep pattern, its first sleep cycle only comprises sleeping window.Second sleep cycle of mobile radio station comprises sleeping window and audit window to each of last sleep cycle.First sleep cycle has the length of the initial sleep cycle comprised in sleep response message.
Mobile radio station receives flow instruction (TRF-IND) message at audit window from base station, and wherein, traffic indication message indicates whether there is the flow for the transmitting to mobile radio station in a base station.If traffic indication message comprises negative instruction, then it means in a base station not used for the flow of the transmitting to mobile radio station.If traffic indication message comprises the instruction of affirmative, then it means the flow had in a base station for the transmitting to mobile radio station.
In FIG, if receive the traffic indication message comprising negative instruction at the audit window of the second sleep cycle, then mobile radio station determines whether the flow not used for the transmitting to down link, and twice sleep cycle being increased to previous sleep cycle is large.
If mobile radio station receives traffic indication message, then it increases sleep cycle according to following equation 1.
[equation 1]
Current sleep cycle=min (the previous sleep cycle of 2*, last sleep cycle)
See equation 1, the twice that current sleep cycle is set to previous sleep cycle by mobile radio station and the smaller value of last sleep cycle comprised in sleep response message.In other words, sleep cycle can not be set to be greater than last sleep cycle by mobile radio station.This is to prevent sleep cycle from increasing constantly.
If mobile radio station receives the traffic indication message comprising instruction certainly at the audit window of the 3rd sleep cycle, then sleep cycle is reset to initial sleep cycle by it.
Thereafter, mobile radio station can receive flow being included in the audit window in MOB_SLP-RSP message to Base Transmitter flow with from base station.Now, if mobile radio station fail be included in the audit window in sleep response message terminate to base station flow launch and receives from the flow of base station, then it by expansion audit window and continue to Base Transmitter flow and from base station reception flow.If receive last PDU indicating device or audit window end mark to Base Transmitter flow with from the mobile radio station of base station reception flow from base station at the audit window of expansion, then its stops the expansion of audit window, and enters sleeping window.
In IEEE 802.16m system, respectively MOB_SLP-REQ/RSP message can be replaced with AAI_SLP-REQ/RSP message.And mobile radio station is assigned with by AAI_SLP-REQ/RSP message the sleep cycle identifier (SCID) being suitable for its flow attribution when entering in sleep pattern.SCID is the identifier of the mobile radio station of sleep pattern, and is mapped to the parameter (initial sleep cycle, audit window length, TIMF mark, LWEF mark, last sleep cycle, NSCF, T_AMS timer etc.) used after mobile radio station enters sleep pattern.And mobile radio station and base station can perform SCID conversion in sleep pattern by considering the flow attribution of mobile radio station or change the parameter value being mapped to SCID.
Meanwhile, can for the specific time period not from mobile radio station transmit uplink data, or can not to the feedback of Base Transmitter down link data (ACK or NACK).Now, base station can retain timer by triggers resource, and the link information at storing mobile station (context (context)) promotes that the network of mobile radio station reenters.Impliedly provide the method in a general mobile communication system.Because base station determines that mobile radio station has lost the timing of the network coverage and basis is not determined, so base station is by the link information at unnecessarily storing mobile station.
In this respect, in common IEEE 802.16m system, if the service of mobile radio station loss of service base station covers, then may produced problem and limit context and retain (the deregistration with contextretention:DCR) pattern of cancellation and coverage loss pattern because cause due to asynchronous between serving BS and mobile radio station.
But, because the mobile radio station operated in sleep pattern only performs the transmitting and receiving of normal data at audit window, if so do not limit the operating process and coverage loss generation of determining coverage loss, how to perform the operating process that network reenters.
Summary of the invention
Therefore, the present invention relates to a kind of method for effectively performing coverage loss operation in BWA during sleep pattern, the method essentially eliminates because one or more problems of causing of the restriction of prior art and shortcoming.
An object of the present invention is to provide a kind of for detecting the method for coverage loss and the equipment for performing the method during the sleep pattern of mobile radio station.
If the mobile radio station that another object of the present invention is to provide a kind of sleep pattern detects coverage loss, carry out method that effective network reenters and the equipment for performing the method.
Those skilled in the art can understand, the object that can be realized by the present invention is not limited to above specifically described object, further, by the detailed description carried out below in conjunction with accompanying drawing, more clearly can understand that the present invention can realize above and other object.
In order to realize these objects with other advantages and according to object of the present invention, as implemented at this and broadly describing, for detecting a method for the coverage loss of the mobile radio station operated in sleep pattern in BWA, comprise step: the sleeping window when the very first time and sleep cycle of launching super frame header (SFH) from serving BS is independently revived; Detect this super frame header; And, if the result detected is successfully, then operate at this sleeping window or audit window according to this sleep cycle, and, if the result of this detection is unsuccessfully, wake until this super frame header successfully detected.
Now, this very first time preferably lucky time of launching this super frame header before this sleeping window terminates.
And the method comprises further: if failed number of times and preset times as many, then scan new channel to the detecting step of super frame header continuously; Base Transmitter first message found to the result due to this scanning step, this first message comprises the identifier for identifying this mobile radio station about the link information (context) of this mobile radio station and is set to the range finding object indication field of the value indicating the network caused because of coverage loss to reenter; Further, receive the second message from the base station of this discovery, this second message comprise instruction reenter period at network can the optimization information of abridged process.
And the method comprises further: the Base Transmitter to this discovery switches ranging code; Receive the 3rd message from the base station of this discovery, the 3rd message comprises the emission results of this switching ranging code; Further, if this emission results is successfully, then from the base station receiving uplink resource allocation information of this discovery, wherein, use the uplink resource indicated by this uplink resource allocation information to perform the step of transmitting first message.
Preferably, this first message is distance measurement request (AAI_RNG-REQ) message, this second message is ranging response (AAI_RNG-RSP) message, 3rd message is that range finding confirms (AAI_RNG-ACK) message, this identifier is context reserved identifier (CRID), because the value that the indication network of coverage loss reenters is 0b1000, and this optimization information reenters process Optimal Parameters.
In another aspect of the present invention, a kind of base station in BWA determines the method for the coverage loss of the mobile radio station operated in sleep pattern, comprise: with by this BTS management first timer for this mobile radio station expire time immediate audit window, launch the first uplink resource allocation information (UL license) to this mobile radio station; And, if receive response signal by the uplink resource indicated by this first uplink resource allocation information from this mobile radio station, then reset this first timer, and if do not receive this response signal from this mobile radio station, then launch at least one second uplink resource allocation information to this mobile radio station, until receive this response signal.
Now, the method comprises further: if preset times does not receive this response signal from this mobile radio station continuously, then launch for asking first message of finding range to this mobile radio station, and start second timer; Further, if receive from this mobile radio station the second message that instruction has successfully performed this range finding before this second timer expires, then this first timer is restarted.
And the method comprises further: if do not receive this second message from this mobile radio station before this second timer expires, then start the 3rd timer.
And this response signal comprises media access control protocol data unit (MAC PDU), and this media access control protocol data unit comprises: tentation data; And there is bandwidth request (BR) header of BR size 0.
Preferably, this first message is uncalled ranging response (AAI_RNG-RSP) message, this second message is range finding checking (AAI_RNG-CFM) message, this first timer is active base station timer (Active_BS_Timer), this second timer is T58 timer, and the 3rd timer is resource reservation timer.
In another aspect of the present invention, a kind of mobile station apparatus for performing sleep pattern in BWA comprises: processor: and, radio frequency (RF) module, for externally transmitted radio signal and from external reception radio signal under the control of this processor, wherein, this processor is independently revived from sleep pattern at the sleeping window of the very first time and sleep cycle when launching super frame header (SFH) from serving BS, detect this super frame header, if the result of this detection is successfully, then operate at this sleeping window or audit window according to this sleep cycle, and if this testing result is unsuccessfully, then wake until this super frame header successfully detected.
Now, this very first time preferably lucky time of launching this super frame header before this sleeping window terminates.
And, this processor: as many failing detects this super frame header if it is continuously with preset times, then scan new channel; Base Transmitter first message found to the result due to this scanning, this first message comprises the identifier for identifying this mobile radio station about the link information (context) of this mobile radio station and is set to the range finding object indication field of the value indicating the network caused because of coverage loss to reenter; Further, receive the second message from the base station of this discovery, this second message comprise instruction reenter period at this network can the optimization information of abridged process.
And, this processor: the Base Transmitter to this discovery switches ranging code; Receive the 3rd message from the base station of this discovery, the 3rd message comprises the emission results of this switching ranging code; And, if this emission results is successfully, then from the base station receiving uplink resource allocation information of this discovery, wherein, use the uplink resource indicated by this uplink resource allocation information to launch this first message.
Preferably, this first message is distance measurement request (AAI_RNG-REQ) message, this second message is ranging response (AAI_RNG-RSP) message, 3rd message is that range finding confirms (AAI_RNG-ACK) message, this identifier is context reserved identifier (CRID), because the value that the indication network of coverage loss reenters is 0b1000, and this optimization information reenters process Optimal Parameters.
According to embodiments of the invention, advantage below can be obtained.
First, the mobile radio station operated in sleep pattern wakes, until it normally receives super frame header, accordingly, this mobile radio station can determine coverage loss.
In addition, effectively, the mobile radio station operated in sleep pattern can reenter by disclosed network in an embodiment of the present invention the network that process performs optimization and reenter process.
Those skilled in the art can understand, the effect that can be realized by the present invention is not limited to above specifically described, and, according to the detailed description carried out below in conjunction with accompanying drawing, other advantages of the present invention can be more clearly understood.
Accompanying drawing explanation
Accompanying drawing is included to provide further understanding of the present invention, and in this application involved and form its part, accompanying drawing diagram (one or more) of the present invention embodiment, and is used from specification one and explains principle of the present invention.In the accompanying drawings:
Fig. 1 is the figure of the example of the sleep mode operation process of the mobile radio station be shown in general IEEE 802.16 system;
Fig. 2 is that diagram can be applied to embodiments of the invention, figure for the example of the method for the coverage loss of base stations detected;
Fig. 3 is that diagram mobile radio station that is according to an embodiment of the invention, sleep pattern successfully receives the figure of super frame header at sleeping window;
Fig. 4 is the figure that diagram mobile radio station that is according to an embodiment of the invention, sleep pattern fails to receive at sleeping window super frame header;
Fig. 5 is the figure of the example illustrating coverage loss recovery process according to an embodiment of the invention;
Fig. 6 is the figure of the example of the sleep mode operation process of the mobile radio station illustrated according to another embodiment of the invention;
Fig. 7 is the figure of the example of the sleep mode operation process of the mobile radio station illustrated according to still another embodiment of the invention;
Fig. 8 is the figure of the example of the sleep mode operation process of the mobile radio station illustrated according to still a further embodiment; And
Fig. 9 is the block diagram of the example illustrating reflector according to another embodiment of the invention and receiver.
Embodiment
Now in detail with reference to the preferred embodiments of the present invention, illustrate the example of the preferred embodiment in the accompanying drawings.As possible, use identical Reference numeral to indicate same or similar part by running through accompanying drawing.
The present invention relates to wireless access system.Below, the method that embodiments of the invention disclose the coverage loss for determining the mobile radio station operated in sleep pattern method, effectively network reenter and the equipment for performing the method.
By combining structural detail of the present invention with predefined type and feature realizes the following examples.Optionally should consider each of structural detail or feature, unless specified independently.Can each of execution architecture element or feature, and not with other structural details or Feature Combination.And, can by some structural details and/or feature combination with one another, to form embodiments of the invention.The order of the operation described in an embodiment of the present invention can be changed.Some structural details of an embodiment or feature can comprise in another embodiment, or can be replaced by the structural detail of correspondence or the feature of another embodiment.
In the description of the drawings, process that theme of the present invention is fuzzy or step may be made by underground.And, by understandable for underground one of ordinary skilled in the art process or step.
In this manual, embodiments of the invention are described based on data transmitting and receiving between the base station and mobile station.In this case, base station refers to the terminal node of network, and it performs with mobile radio station and directly communicates.According to possible situation, can perform by the upper node of base station the specific operation being described to be performed by base station.
In other words, obviously, various operations in order to perform with mobile station communicate in the network comprising the multiple network nodes together with this base station can be performed by base station or the network node except base station.Base station (BS) can be replaced by the term of such as fixed station, Node B, eNodeB (eNB) and access point (AP).And mobile radio station can be replaced by the term of such as subscriber equipment (UE), subscriber station (SS), mobile subscriber station (MSS) and mobile terminal (MT).
And emitting side refers to the fixing and/or mobile node providing data, services or voice service, and receiver side finger receives the fixing and/or mobile node of data, services or voice service.Therefore, in the uplink, mobile radio station can be emitting side, and base station can be receiver side.Equally, in the downlink, mobile radio station can be receiver side, and base station can be emitting side.
Simultaneously, in the present invention, the example of mobile radio station comprises personal digital assistant (PDA), cell phone, personal communication service (PCS) phone, global mobile system (GSM) phone, wideband CDMA (WCDMA) phone and mobile broadband system (MBS) phone.
Can realize according to embodiments of the invention by such as hardware, firmware, software or its various means combined.
If by hardware implementing according to embodiments of the invention, then can pass through: one or more application-specific integrated circuit (ASIC) (ASIC), digital signal processor (DSP), digital signal processor (DSPD), programmable logic device (PLD), field programmable gate array (FPGA), processor, controller, microcontroller, microprocessor etc., realize embodiments of the invention.
If realize according to embodiments of the invention by firmware or software, then can realize method according to an embodiment of the invention by the one performing the module of function as above or operation, process or function.Such as, software code can be stored in a memory cell, then can be driven by processor.It is inner or outside that this memory cell can be positioned at processor, to receive data by known various means to processor transmitting data with from processor.
Embodiments of the invention can by wireless access system, that is, normative document support disclosed at least one of IEEE 802 system, 3GPP system, 3GPP LTE system and 3GPP2 system.That is, in an embodiment of the present invention, above normative document can support the step that is not described to illustrate technical characteristic of the present invention or part.And, by above normative document, all terms disclosed herein can be described.Specifically, embodiments of the invention can by IEEE802.16 system, that is, one or more normative document supports of P802.16e-2004, P802.16e-2005, P802.16Rev2 and IEEEP802.16m.
There is provided the following particular term used in an embodiment of the present invention to help understand the present invention, and in the scope that this particular term does not depart from technical spirit of the present invention, various amendment can be carried out wherein.
In this manual, based on IEEE 802.16 system, the present invention will be described.Specifically, assuming that mobile radio station is the advanced mobile station (AMS) meeting the specification limited in IEEE 802.16m standard, and base station is the senior base station (ABS) with the standard identical standard of AMS.
Coverage loss
First, definition can be applied to " coverage loss (coverageloss) " of embodiments of the invention.
Coverage loss refers to the temporary transient dropout occurred because of the decay produced when mobile radio station moves to the region of the coverage (that is, covering) of losing base station.
Next, by definition of activities base timer (active_ABS_timer).
Active base station timer refer to by base station be in mobile radio station each keep timer.Active base station timer can be started when completing when initial network enters based on registration request/response (AAI_REG-REQ/AAI_REG-RSP) completing of message between a mobile station and a base station.Alternatively, complete when network reenters can start active base station timer when processing optimization based on the switching comprised at ranging response message (HO).When base station receives data from mobile radio station, the active base station that can reset timer.Now, the example of data comprises media access control protocol data unit (MAC PDU (MPDU)) and feedback information.
And, if the base station of correspondence did not switch (HO) completion notice message by backbone network from network reception before the Preset Time when the mobile radio station using the base station of this correspondence as serving BS performs the switching to another target BS, then can start active base station timer.Now, this Preset Time is preferably started the time of deadline date (Ranging_Initiation_Deadline) information instruction by range finding.
Next, resource will be defined and retain timer.
If active base station timer (Active_ABS_timer) expires for specific mobile radio station, then base station performs the prior defined procedure of the coverage loss for determining corresponding mobile radio station.This process will be called as " coverage loss detection ".The process of coverage loss detection will be described in detail after a while.Even if if also not from the response of mobile radio station after the process of coverage loss detection, then base station can start resource reservation timer.If resource retains timer expiration, then base station can discharge the context of corresponding mobile radio station.
Also by definition of activities mobile radio station timer (Active_AMS_Timer).
In the mode that the active base station timer with above-mentioned is identical, active mobiles timer can be started when completing when initial network enters based on registration request/response (AAI_REG-REQ/AAI_REG-RSP) completing of message between a mobile station and a base station.Alternatively, complete when network reenters can start active mobiles timer when processing optimization based on the switching comprised at ranging response message (HO).Mobile radio station can identify the time (that is, until active mobiles timer expiration) retaining it in a network and connect upper and lower Wonder maintenance active mobiles timer.
Next, by defining context reserved identifier (CRID).
CRID can be distributed from base station to mobile radio station by registration response (AAI_REG-RSP) message.CRID is the identifier that may be used for identifying from network (specifically, retaining entity (such as, authenticator ASN-GW) or the base station of the link information (context) of corresponding mobile radio station) corresponding mobile radio station.And CRID may be used for being identified in and retains relative to context the mobile radio station operated in (DCR) pattern of cancellation.This CRID can be assigned to mobile radio station by registration reply message, or can by reentering ranging response (AAI_RNG-RSP) message of period at network or entering cancellation response (AAI_DREG-RSP) message of period in DCR pattern and be updated.
Below, describe for the method by using above-mentioned timer to detect the coverage loss of mobile radio station and base station with reference to Fig. 2.
Fig. 2 is that diagram can be applied to embodiments of the invention, figure for the example of the method for the coverage loss of base stations detected.
See Fig. 2, first, according to completing of entering of initial network or network reenters completes, while mobile radio station starts active mobiles timer (S201), the active base station timer of the base station initiated mobile radio station for correspondence.
Now, can be entered by the initial network that completed of registration request/response (AAI_REG-REQ/AAI_REG-RSP) message between a mobile station and a base station, further, can depend on that the switching (HO) comprised at ranging response message processes optimization and reenters to complete network.When initial network enters, context reserved identifier (CRID) can be distributed by registration response (AAI_REG-RSP) message to mobile radio station.When network reenters, new CRID can be distributed by ranging response (AAI_RNG-RSP) message to mobile radio station.
Now, if active base station timer is expired for the mobile radio station of correspondence, then base station assigns up link (UL) permits that pulse train (S202) is to identify the state of corresponding mobile radio station.
Mobile radio station passes through distributed UL license to Base Transmitter MPDU or the bandwidth request header (BR header) with bandwidth on demand size 0.If base station receives MPDU or BR header, then can reset active base station timer.
But, by the continuous UL of predetermined quantity, base station can not by permitting that the uplink resource that (coverage loss detects UL and permits) indicates receives data (comprising the MAC PDU of data or BR header) (S203, S204) from mobile radio station.
In this case, uncalled ranging response (AAI_RNG-RSP) message is launched to mobile radio station in base station, makes mobile radio station carry out execution cycle range finding based on cycle ranging code.For this reason, the distance measurement request bit of ranging response message is set to ' 1 ' (S205) by base station.
Now, base station can start instruction for receiving the timer (such as, retry timer or T58 timer) of the stand-by period of the message for checking of finding range.
Mobile radio station according to the distance measurement request of base station to Base Transmitter cycle ranging code (S206).
Base station in response is launched range finding and is confirmed ((AAI_RNG-ACK) message (S207) in ranging code to mobile radio station.Now, acknowledge message of finding range can comprise the information (distance measuring states) being used to indicate ranging success or failure and the ranging code launched from mobile radio station.
Mobile radio station verifies (AAI_RNG-CFM) message (S208) in response to range finding acknowledge message to Base Transmitter range finding.Now, mobile radio station can comprise its station ID (STID) in range finding checking message.
If base station receives the range finding acknowledge message of launching from mobile radio station, then it upgrades active base station timer (S209).
If base station fails to receive range finding before T58 timer expiration confirm (AAI_RNG-CFM) message, then it starts resource reservation timer, the dynamic context of the mobile radio station that release is corresponding, and static context is moved to the contextual network entity at storing mobile station.
Meanwhile, if, downlink synchronization synchronous with physics (PHY) layer of base station or uplink synchronisation failure, then mobile radio station can be defined as coverage loss state.Such as, if mobile radio station fails to receive the super frame header (SFH) be equal to preset times (NLOST-SFH) continuously from base station, then fault can be defined as the coverage loss of self-corresponding base station by it.
First embodiment
One embodiment of the present of invention propose and whether have successfully received super frame header (that is, mobile radio station and base station synchronization) from base station determine coverage loss by being identified in the mobile radio station operated in sleep pattern.
Below, by describe according to this embodiment be used for receive the method for super frame header and be used for determining the method for coverage loss.
Mobile radio station upgrades super frame header (SFH) periodically in sleep pattern.In other words, if mobile radio station is identified by P-SFH IE have updated SFH, then it was revived from the time (such as, just upgrading the time of corresponding S-SFHSP IE before sleeping window terminates) of launching the S-SFH SP IE upgraded, and upgraded SFH.But the mobile radio station operated in sleep pattern can revive to detect SFH, but may fail to receive SFH (audit window such as, arranged with frame unit may not or mobile radio station overlapping with SFH transmitting site may not with base station synchronization).In this case, the mobile radio station of sleep pattern can revive to detect SFH from sleeping window.
Specifically, fail to receive SFH if this embodiment proposes mobile radio station, then mobile radio station continues to keep wake states (even if that is, also reviving at sleeping window) successfully to receive SFH, and has nothing to do with sleep cycle.Thereafter, if mobile radio station receives SFH (that is, mobile radio station and base station synchronization), then it can operate according to sleep cycle.On the other hand, if mobile radio station fails to receive SFH continuously reach pre-determined number (that is, NLOST-SFH), then it can be defined as coverage loss state.In this case, mobile radio station can perform coverage loss recovery process.Coverage loss recovery process will be described below.
With reference to Fig. 3 to Fig. 5, the method for operating sleep pattern according to this embodiment is described.
Fig. 3 is the figure that diagram is according to an embodiment of the invention, the mobile radio station of sleep pattern successfully receives super frame header at sleeping window, and Fig. 4 is the figure that diagram is according to an embodiment of the invention, the mobile radio station of sleep pattern fails to receive super frame header at sleeping window.And Fig. 5 is the figure of the example illustrating coverage loss recovery process according to an embodiment of the invention.
First, with reference to figure 3, because the framing bit that SFH is launched into is before audit window starts, even if so the mobile radio station operated in sleep pattern also revives to receive SFH before sleeping window terminates.But if mobile radio station receives SFH with failing, it continues to wake until next SFH launches timing and has nothing to do with audit window, then operates according to sleep cycle and if it receives SFH.In figure 3, because the time when receiving SFH is sleeping window, then mobile radio station operates in sleep pattern.
On the contrary, when supposing that the value of NLOST-SFH is 4, if fail to receive SFH for other three times in the mobile radio station state of reviving after it fails to receive SFH, then it is defined as coverage loss state, and performs coverage loss recovery process.
Below, with reference to Fig. 5, the coverage loss recovery process according to this embodiment is described.
Fig. 5 is the figure of the example illustrating coverage loss recovery process according to an embodiment of the invention.
If mobile radio station determination coverage loss state, then it scans new channel to find base station.If found base station, then mobile radio station is by synchronous with physical down link (PHY DL) for the base station found, and switches (HO) ranging code (S501) to Base Transmitter.Now, the base station found can be identical with previous serving BS, or can be another base station.
Base station successfully receives ranging code, launch range finding confirmation (AAI_RNG-ACK) message by mobile radio station being set to success status to mobile radio station, and distribute uplink bandwidth (UL BW) (S502 and S503) to mobile radio station.
Mobile radio station has the distance measurement request message (S504) of range finding object indicating device to Base Transmitter by the uplink resource that distributes, this range finding object indicating device is set to be used to indicate because the value (such as, 0b1000) that reenters of the network that causes of coverage loss.Now, mobile radio station comprises CRID in distance measurement request message, and if secure connection information is useful, the message authentication code based on password (CMAC) key being used as new authenticate key (AK) to produce protects CRID.
Base station can obtain the link information (S505) of mobile radio station by means of the network entity using the CRID request of launching via request message to store the link information of corresponding mobile radio station.
Omissible MAC control message is determined by using the link information of the mobile radio station obtained in base station, and comes to launch ranging response (AAI_RNG-RSP) message (S506) to mobile radio station by arranging handover optimization parameter.
In other words, omit omissible process (signaling, control MAC message) by the process Optimal Parameters that reenters of AAI_RNG-RSP message, accordingly, process can be reentered by simplified network.
Now, ranging response message can comprise come self-corresponding base station, for identifying the station identifier (STID) of mobile radio station.If upgrade CRID, then ranging response message may further include new CRID.And if useful from the CMAC value of the distance measurement request message of mobile radio station transmitting, then ranging response message can be encoded and is transmitted into mobile radio station.
Thereafter, mobile radio station can perform network according to Optimal Parameters and reenter process.
Second embodiment
An alternative embodiment of the invention proposes and uses the value of active base station timer to determine coverage loss.
When mobile radio station enters sleep pattern, can by the value of predetermined MAC message to mobile radio station launch activities base timer.In more detail, during sleep pattern start-up course, provided the value of active base station timer to mobile radio station from base station by AAI_SLP-RSP message.By the value of active base station timer, mobile radio station can identify when base station assigns UL license is to detect coverage loss.Now, the time (that is, frame that is that indicated by start frame number value and that comprise in AAI_SLP-RSP message) when the time of application activity base timer, preferably mobile radio station operated in sleep pattern after sleep pattern start treatment terminates.
With reference to Fig. 6, the operating process when the mobile radio station when AAI_SLP-RSP message comprises the value of active base station timer is described.
Fig. 6 is the figure of the example of the sleep mode operation process of the mobile radio station illustrated according to another embodiment of the invention.
See Fig. 6, mobile radio station is revived with the time detecting coverage loss in base station assigns UL license, and be assigned with UL license, and by being permitted denotable UL resource by the UL of correspondence to Base Transmitter PDU co-pending (when there is no PDU co-pending, there is BR header or the only byte of padding of BR size 0).Thereafter, mobile radio station operates according to sleep cycle again.
3rd embodiment
The effective transmitting timing other embodiments contemplated from base station to the UL license of the mobile radio station distribution operated sleep pattern of the present invention, to determine the coverage loss of corresponding mobile radio station.
In more detail, this embodiment proposes, if the time of active base station timer expiration is sleeping window interval, then base station is permitted distributing UL with the time of active base station timer expiration immediate audit window to mobile radio station.
Fig. 7 is the figure of the example of the sleep mode operation process of the mobile radio station illustrated according to still another embodiment of the invention.
See Fig. 7, because and the end time of the 3rd super frame corresponding to the time of active base station timer expiration is sleeping window interval, permit so base station distributes UL at the audit window existed with the time of active base station timer expiration immediate second frame place to mobile radio station.As a result, mobile radio station is assigned with UL license, and by being permitted denotable UL resource to Base Transmitter PDU (when not having PDU co-pending, there is the BR header of BR size 0) co-pending by the UL of correspondence.In this embodiment, because distribute UL license for the listening intervals of mobile radio station, so it is advantageous that mobile radio station need not know the value of active base station timer, and need not revive from sleeping window.
4th embodiment
This embodiment of the present invention proposes, base station starts in sleep pattern or launches the next cycle ranging parameters be used to indicate for distributing the timing information that UL permits to mobile radio station, to detect the coverage loss of the mobile radio station of sleep pattern at audit window by predetermined MAC message or header during sleep mode operation.
In this case, next cycle ranging parameters can be uncalled sleep response message, and header can be sleep control header (SCH) or sleep control extension header (SCEH).This describes with reference to Fig. 8.
Fig. 8 is the figure of the example of the sleep mode operation process of the mobile radio station illustrated according to still a further embodiment.
See Fig. 8, if active base station timer terminates at the sleeping window of mobile radio station, then base station launches next cycle ranging parameters at previous audit window to mobile radio station in advance, to launch timing to mobile radio station notice UL license.Result, the time that mobile radio station is being indicated by next cycle ranging parameters revives, be assigned with UL license, and by being permitted denotable UL resource to Base Transmitter PDU (when not having PDU co-pending, there is the BR header of BR size 0) co-pending by the UL of correspondence.Thereafter, mobile radio station operates according to sleep cycle again.
Table 3 below illustrates the example of next cycle ranging parameters.
[table 1]
The configuration of mobile radio station and base station
Using describe as an alternative embodiment of the invention, mobile radio station and the base station that can be performed embodiments of the invention by it.
Mobile radio station is in the uplink as reflector operation, and mobile radio station operates as receiver in the downlink.Further, base station is in the uplink as receiver operation, and base station operates as reflector in the downlink.In other words, each of mobile radio station and base station can comprise reflector for transmitting and receiving information or data and receiver.
Reflector and receiver can comprise the processor, module, parts and/or the device that perform embodiments of the invention.Specifically, reflector and receiver can comprise for the module (device) of coded message, for the module of the message of decoding and coding and the antenna for transmitting and receiving message.The example of reflector and receiver is described with reference to Fig. 9.
Fig. 9 is the block diagram of the example illustrating reflector according to another embodiment of the invention and receiver.
See Fig. 9, left side represents the structure of reflector, and right side represents the structure of receiver.Each of reflector and receiver can comprise antenna 5,10, processor 20,30, transmitter module 40,50, receiver module 60,70 and memory 80,90.Each element can perform the function corresponding with the function of the other side.Below, each element will be described in more detail.
Antenna 5,10 for externally launching the signal produced by transmitter module 40,50, or from external reception radio signal, to transmit this radio signal to receiver module 60,70.If support MIMO function, then two or more antenna can be set.
Antenna, transmitter module and receiver module can form radio frequency (RF) module.
Processor 20,30 controls the integrated operation of mobile radio station usually.Such as, processor 20,30 can perform: for performing the controller function of the above embodiment of the present invention; Media interviews according to service characteristic and radio conditions control the variable controlling functions of (MAC) frame; Handoff functionality; Certification and encryption function etc.In more detail, processor 20,30 can perform restarting and performing the entirety control that network reenters process for base stations detected, as shown in Figures 2 and 3.
Particularly, the processor of mobile radio station can by launching SFH to determine the time of coverage loss and independently to revive with sleep cycle and receive SFH during sleep mode operation.Now, if the processor of mobile radio station fails to receive SFH, then it continues to wake and is not transformed into sleep state, and receives next SFH.If the processor of mobile radio station fails to receive SFH reach preset times, then it can perform coverage loss recovery process.In other words, the processor of mobile radio station is controlled to by Base Transmitter distance measurement request message, wherein, distance measurement request message comprises range finding object indication field and CRID, and this range finding object indication field is set to the value indicating the network based on coverage loss to reenter.Thereafter, if receive ranging response message from base station, then the processor of mobile radio station can be optimized according to the switching comprised at ranging response message (HO) process the network that the value of field performs optimization and reenters process.
In addition, the processor of mobile radio station can perform the overall control operation of disclosed process in the above-described embodiments.
Transmitter module 40,50 performs from processor 20,30 scheduling and is then launched into predictive encoding and the modulation of outside data, and right rearward-facing antenna 10 transmits the data of coding and modulation.
Receiver module 60,70 performs decoding and demodulation to recover initial data for by antenna 5,10 from the radio signal of external reception, and then to the data of this recovery of processor 20,30 transmission.
Memory 80,90 can store the program of process for the treatment of device 20,30 and control, or can perform the function (restarting counting etc.) for temporarily storing input/output data.And, memory 80,90 can comprise: at least one type in flash memory type, hard disk type, Multimedia Micro Cards type, card-type memory (such as, SD or XD memory), random access memory (RAM), static RAM (SRAM), read-only memory (ROM), Electrical Erasable programmable read only memory (EEPROM), programmable read only memory (PROM), magnetic memory, disk and CD.
Simultaneously, base station can perform controlling functions for performing the above embodiment of the present invention by least one of above-mentioned module, OFDM (OFDMA) packet scheduling, time division duplex (TDD) packet scheduling and channel multiplexing function, media interviews based on service characteristic and radio conditions control the variable controlling functions of (MAC) frame, quick flow Real Time Control Function, handoff functionality, certification and encryption function, for the grouping modulation and demodulation function that data are launched, fast packet channel encoding function and modulated in real time demodulator controlling functions, or the individual components that may further include for performing above-mentioned functions, module or part.
Obvious for those skilled in the art, when not departing from spirit of the present invention and necessary characteristic, the present invention can be embodied in other specific forms.Therefore, embodiment is above counted as illustrative and indefiniteness in all fields.Should determine scope of the present invention by the reasonable dismissal of appended claim, and the institute in equivalency range of the present invention changes and is included in scope of the present invention.
Claims (6)
1., for detecting a method for the coverage loss of the mobile radio station operated in sleep pattern in BWA, described method comprises step:
When from serving BS launch super frame header time, only be followed by described sleep pattern sleeping window audit window frame before revive;
When described super frame header is successfully detected, then ensure that the information of described super frame header is updated;
When described super frame header is not detected, during audit window and sleeping window, keep waking until described super frame header successfully detected;
If the described detection of described super frame header failed preset times continuously, then scan new channel;
The Base Transmitter distance measurement request message found to the result due to described scanning step, described distance measurement request message comprises the identifier identifying described mobile radio station and the range finding object instruction indicating the network caused because of coverage loss to reenter; Further,
Receive ranging response message from the base station of described discovery, described ranging response message comprise instruction reenter period at described network can the optimization information of abridged process.
2. method according to claim 1, comprises further:
Base Transmitter to described discovery switches ranging code;
Receive the 3rd message from the base station of described discovery, described 3rd message comprises the information of the distance measuring states about described switching ranging code; Further,
If described distance measuring states is successfully, then from the base station receiving uplink resource allocation information of described discovery, wherein, the uplink resource indicated by described uplink resource allocation information is used to perform the transmitting of the first message.
3. method according to claim 2, wherein, described 3rd message is range finding acknowledge message, and described identifier is context reserved identifier, because the value that the indication network of coverage loss reenters is 0b1000, and described optimization information reenters process Optimal Parameters.
4. in BWA, perform a mobile station apparatus for sleep pattern, described mobile station apparatus, comprising:
Processor: and,
Radio-frequency module, for externally transmitted radio signal and from external reception radio signal under the control of described processor,
Wherein, described processor is configured to:
When from serving BS launch super frame header time only be followed by described sleep pattern sleeping window audit window frame before revive,
When described super frame header is successfully detected, then ensure that the information of described super frame header is updated;
When described super frame header is not detected, then keep waking until described super frame header successfully detected during audit window and sleeping window;
If as many failing detects described super frame header with preset times continuously, then scan new channel,
The Base Transmitter distance measurement request message found to the result due to described scanning, described distance measurement request message comprises the identifier identifying described mobile radio station and the range finding object instruction indicating the network caused because of coverage loss to reenter; Further,
Receive ranging response message from the base station of described discovery, described ranging response message comprise instruction reenter period at described network can the optimization information of abridged process.
5. mobile station apparatus according to claim 4, wherein, described processor is further configured to: the Base Transmitter to described discovery switches ranging code; Receive the 3rd message from the base station of described discovery, described 3rd message comprises the information of the distance measuring states about described switching ranging code; Further, if described distance measuring states is successfully, then from the base station receiving uplink resource allocation information of described discovery, wherein, the uplink resource indicated by described uplink resource allocation information is used to launch the first message.
6. mobile station apparatus according to claim 5, wherein, described 3rd message is range finding acknowledge message, and described identifier is context reserved identifier, because the value that the indication network of coverage loss reenters is 0b1000, and described optimization information reenters process Optimal Parameters.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
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| US30247810P | 2010-02-08 | 2010-02-08 | |
| US61/302,478 | 2010-02-08 | ||
| KR1020100105885A KR101670749B1 (en) | 2010-02-08 | 2010-10-28 | Method for efficiently performing Coverage Loss Operation during Sleep Mode in a Broadband Wireless Access System |
| KR10-2010-0105885 | 2010-10-28 | ||
| PCT/IB2011/000390 WO2011095895A2 (en) | 2010-02-08 | 2011-02-08 | Method for efficiently performing coverage loss operation during sleep mode in a broadband wireless access system |
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| CN102754363A CN102754363A (en) | 2012-10-24 |
| CN102754363B true CN102754363B (en) | 2015-09-30 |
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| CN101040550A (en) * | 2004-10-14 | 2007-09-19 | 以色列奥维通有限公司 | Method and apparatus for power savings in wireless systems |
| US20080182567A1 (en) * | 2007-01-30 | 2008-07-31 | Stmicroelectronics R&D Co. Ltd. (Beijing) | Sleep mode control for real-time services in broadband wireless access communication systems |
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| CA2651868C (en) * | 2006-05-13 | 2014-11-25 | Lg Electronics Inc. | Method of performing procedures for initial network entry and handover in a broadband wireless access system |
| WO2009060395A1 (en) | 2007-11-05 | 2009-05-14 | Nokia Corporation | Layer-1 signaling of traffic indication for power saving class of type 1 in wimax |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101040550A (en) * | 2004-10-14 | 2007-09-19 | 以色列奥维通有限公司 | Method and apparatus for power savings in wireless systems |
| US20080182567A1 (en) * | 2007-01-30 | 2008-07-31 | Stmicroelectronics R&D Co. Ltd. (Beijing) | Sleep mode control for real-time services in broadband wireless access communication systems |
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| "Sleep Mode operation in 16m";XINQI;《IEEE C802.16M-09/0591R3》;20090302;全文 * |
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| KR20110092200A (en) | 2011-08-17 |
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