A kind ofly switch the back and keep dormant method carrying out the sub-district
Technical field
The present invention relates to the mobile communication technology field, be meant especially and a kind ofly switch the back and keep dormant method carrying out the sub-district.
Background technology
802.16e system is a mobile wide-band wire-less accessing system, system mainly is made up of travelling carriage and base station.Portable terminal can switch roaming between the different base station sub-district.So-called handoff procedure is exactly that portable terminal interrupts and being connected of current base station, and is connected to the process of new base station.Hereinafter MSS specially refers to portable terminal, and BS specially refers to the base station.The base station of the current connection of MSS is called serving BS (Serving BS), and the purpose base station that will switch is called purpose base station (Target BS).
In order to save the electrical source consumption of MSS, the IEEE802.16e/D5 draft has defined the sleep state of MSS.So-called sleep pattern is a portable terminal in the time interval of consulting in advance with the base station, the temporary transient process of getting in touch with the base station of interrupting.Realize that sleep mode procedures can reduce the transmission request of portable terminal on up link and down link, thereby reduce the power consumption of MSS.MSS can initiatively send sleep request message (MOB_SLP_REQ) request to Serving BS and enter sleep pattern, Serving BS sends sleep response message (MOB_SLP_RSP) agreement or refuses MSS and enters sleep pattern then, also can initiatively send sleep response message (MOB_SLP_RSP) by BS and require MSS to enter sleep pattern.
After MSS enters sleep pattern, at sleep state with intercept between state alternately conversion.Under sleep state, MSS discord Serving BS is mutual, can not intercept the message of Serving BS; Under the state of intercepting, MSS must intercept the message of Serving BS, and may finish sleep pattern according to the indication of Serving BS and return normal mode or continue sleep pattern.MSS enters the time started of sleep pattern by the appointment of the Start Frame parameter among the MOB_SLP_RSP, and the time that each sleep state continuously continues is called sleeping window; After switching to the state of intercepting from sleep state, the time that the state of intercepting continues is called listen window at every turn, and the length of listen window is specified by MOB_SLP_RSP message equally.
Switch if MSS runs into the sub-district in sleep procedure, then MSS must the disrupted sleep pattern enter normal condition, after MSS finishes handoff procedure, reenters sleep pattern again.
Need to prove that the size setting of sleeping window realizes according to following formula:
Initial_sleep_window obtains from MOB_SLP_RSP message in the following formula.
Final_sleep_window obtains according to following formula:
final_sleep_window=final_sleep_window_base×2
(final_sleep_window_exp?onent)(2)
Wherein final_sleep_window_base and final_sleep_window_exponent parameter are to obtain from MOB_SLP_RSP message.I
0Expression is the lasting time of sleep state for the first time, I
kRepresent the lasting time of sleep state the K+1 time.By above-mentioned formula (1) and (2) as can be known, the initial sleeping window of portable terminal is the shortest, if portable terminal never carries out business in a period of time, its sleeping window can be more and more longer, reach final_sleep_window the longest length of one's sleep, therefore can further reduce and activate the number of times of intercepting, reach more purpose of power saving.
At present, under sleep pattern, will carry out the sub-district when switching, must the disrupted sleep pattern get back to normal mode if in the up-to-date agreement IEEE802.16e/D5 of IEEE802.16, stipulated MSS, finish handoff procedure by the time after, reenter sleep pattern again.And sleep procedure and handoff procedure are two independently processes fully.After switching is finished, can send sleep request message (MOB_SLP_REQ) by MSS and ask to enter sleep pattern, also can initiatively send sleep response message (MOB_SLP_RSP) and come requirement MSS to enter sleep pattern by Target BS.
As shown in table 1, sleep response (MOB_SLP_RSP) message comprises management message type (Management message type), sleep approval (Sleep-approved), time started (Startframe), initial sleeping window (initial_sleep window), maximum sleeping window radix (final_sleepwindow base), listen window (listening_window), maximum sleeping window index sleep state parameters such as (final_sleepwindow exponent).
Syntax |
Size |
Notes |
MOB-SLP-RSP_Message_Format () |
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Management message type=51 |
8bits |
Type of message=51 expressions: this message is sleep response message |
Sleep-a pproved |
1bit |
Sleep allows indication 0: refusal MSS enters sleep pattern 1: allow MSS to enter sleep pattern |
If (Sleep-approved==0) |
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REQ-duration |
7bits |
If refusal MSS enters sleep pattern, promptly during Sleep-approved==0, comprise the REQ-duration parameter in the message.The REQ-duration parameter has been stipulated a time span, and during this period of time MSS can not initiate the sleep request to Serving BS once more, initiates the sleep request to Serving BS again after during this period of time. |
} |
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Else{ |
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If (SHO or FBSS capability enabled) |
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If in register requirement/registration reply message reciprocal process, support soft handover (SHO) and fast base station to select (FBSS) function, then in this message, comprise " Maintain Active Set and Anchor BS ID " parameter. |
Maintain Active Set and Anchor BS ID |
1bit |
1: under sleep pattern, MSS preserves Active set and Anchor BS ID before the SHO/FBSS timer expiry.0: under sleep pattern, do not preserve Active Set (Active set) and anchorage station identifications (Anchor BS ID). |
If (Active Set and Anchor BS ID maintained) |
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If " Maintain Active Set and Anchor BS ID " parameter value is " 1 ", then in this message, comprise " SHO/FBSS duration (s) " this parameter |
SHO/FBSS duration (s) |
3bits |
MSS preserves Activc set after entering sleep and the Anchor BS ID time is 10 * 2
sFrame, " s " are the numerical value of this parameter.
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} |
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} |
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Start frame |
6bits |
Begin to enter the initial frame number of sleep pattern |
Initial-sleep window |
6bits |
Initially begin the initial window size of sleeping |
Final-sleep window base |
10bits |
Maximum sleeping window radix |
Listening-window |
4bits |
The listen window size |
Final-sleep window exponent |
3bits |
Maximum sleeping window index |
SLPID |
10bits |
Sleep ID number of MSS |
Sleep duration |
8bits |
The sleep duration is a unit with the 20ms frame.During this period of time MSS can not initiatively send upstream data, after during this period of time, |
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MSS just can send upstream data to Serving BS. |
TLV encoded information |
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The TLV coded message |
} |
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Padding |
Variable |
The filling bit position. |
} |
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Table 1
MSS is after the MOB_SLP_RSP message that receives Target BS transmission, obtain Startframe, initial_sleep window, final_sleep window base, listening_window, sleep state parameters such as final_sleep window exponent, enter sleep pattern according to Start frame parameter in the moment of regulation, according to initial_sleep window, final_sleep window base, these three parameters of final_sleep window exponent are provided with the length of sleeping window, and the length of listen window is set according to the listening_window parameter.
Therefore, according to the regulation of the agreement when running into switch instances in the sleep procedure among the present 802.16e/D5 as can be known, be in the portable terminal of sleep pattern, owing to need carry out cell switch process, its sleep pattern will be interrupted, finish switching after, portable terminal need carry out complete sleep request process, regain the sleep pattern parameter from target BS, begin new sleep procedure.And, when portable terminal reenters sleep procedure, the initial sleeping window length of portable terminal must be set to intial-sleepwindow, like this, portable terminal need be from initial sleeping window, circulation is carried out sleep state and is intercepted state, and dormant sleeping window begins to increase gradually from intial-sleep window.But, because portable terminal may during this period of time never have business, after it carried out switching, the mobile terminal sleeping window is smaller, so the time of mobile terminal sleeping state is shorter, need intercept repeatedly, so for portable terminal, power consumption increases.
And in fact, the sleep pattern parameter before and after switching may be just the same, and the sleep state parameter of transmitting in the sleep request process after therefore switching comprises redundant information, the interface-free resources between waste base station and portable terminal.
Summary of the invention
In view of this, the object of the present invention is to provide and a kind ofly switch the back and keep dormant method carrying out the sub-district, make it after finishing switching, still can keep original sleep state, reduce the power consumption of portable terminal.
In order to achieve the above object, the invention provides and a kind ofly switch the back and keep dormant method carrying out the sub-district, this method comprises:
A. be in portable terminal disrupted sleep pattern when carrying out the sub-district switching of sleep pattern, preserve the preceding sleep state parameter of switching under this sleep pattern, the sleep state parameter before this switching comprises the listen window parameter at least, interrupts preceding sleeping window parameter;
B. after switching is finished, target BS sends the sleep Indication message that contains the zero-time of sleeping to this portable terminal, does not comprise listen window listening_window, maximum sleeping window radix final_sleep window base, maximum sleeping window index final_sleep window exponent and initial sleeping window initial-sleep window parameter in the described sleep Indication message;
C. the sleep state parameter before the sleep zero-time parameter that sends according to target BS of portable terminal and the switching of self preserving enters sleep pattern once more, and sleeping window parameter and listen window parameter before the interruption of preserving according to step a respectively of the initial sleeping window length of this sleep pattern and listen window length obtain.
Sleeping window parameter before the described interruption is the sleeping window length before interrupting, or interrupts advancing into dormant number of times.Sleep state parameter before the described switching comprises listening_window, final_sleepwindow base, final_sleep window exponent and interrupts preceding sleeping window length.
Sleep state parameter before the described switching comprises that initial-sleep window, listening_window, final_sleep window base, final_sleep window exponent and interruption advance into dormant number of times.
Sleeping window parameter before described interruption is for interrupting advancing into dormant number of times and initial-sleep
During the window parameter, the initial sleeping window length of this sleep pattern described in the step c is according to initial-sleep window parameter, final_sleep window base parameter, final_sleep windowexponent parameter and enters dormant number of times and calculate.
During portable terminal disrupted sleep pattern, determine that current sleeping window length has reached maximum among the step a, the sleep state parameter before the then described switching comprises sleep maximized window length and listening_window.
The Indication message of sleep described in the step b also further comprises SLPID, Sleep duration and TLVencoding information parameter.
The described sleep Indication message of step b further comprises Maintain Active Set and Anchor BS ID parameter, is illustrated in whether MSS preserves Active se and Anchor BS ID switch (SHO or FBSS) timer expiry between soft handover or fast base station before under the sleep pattern;
Then among the step c portable terminal when the sleep state that enters once more in the sleep pattern is finished in switching, portable terminal determines whether preserve Active set and Anchor BS ID before SHO or FBSS timer expiry according to this parameter, if, then before SHO or FBSS timer expiry, preserve Active set and AnchorBS ID, and the BS among Anchor BS and the Active set is scanned at sleeping window, otherwise, do not handle.
When method of the present invention is carried out the sub-district switching when MSS disrupted sleep pattern, preserve the sleep state parameter under this sleep pattern, after finishing the sub-district switching, target BS sends the sleep Indication message that contains the zero-time of sleeping to this portable terminal; Portable terminal is according to receiving that sleep zero-time that target BS sends and the sleep state parameter of self preserving enter sleep pattern, and the initial sleeping window under the sleep pattern is the sleeping window length before interrupting at this moment.Therefore, the sleeping window size of this method MSS before and after switching is consistent, has kept dormant continuity, and having reduced MSS must iteration repeatedly just can return to the number of times that switches preceding sleeping window size, has reduced and has intercepted number of times, has saved power.And, because this method only needs target BS to send the sleep zero-time, and do not need to send other sleep state parameter, so saved the interface-free resources between base station and the portable terminal.
Description of drawings
Fig. 1 is for realizing the schematic flow sheet of the inventive method.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Sleep state parameter under the sleep pattern, after finishing the sub-district switching, target BS sends the sleep Indication message that contains the zero-time of sleeping to this portable terminal; Portable terminal is according to receiving that sleep zero-time that target BS sends and the sleep state parameter of self preserving enter sleep pattern.
Referring to shown in Figure 1, realize that method of the present invention may further comprise the steps:
Step 101: be in portable terminal disrupted sleep pattern when carrying out the sub-district switching of sleep pattern, and preserve the sleep state parameter under this sleep pattern, this sleep state parameter comprises the listen window parameter at least, interrupts preceding sleeping window parameter.
Sleeping window length before the sleeping window parameter can be to interrupt also can advance into dormant number of times for initial-sleepwindow and interruption.
Step 102: after the sub-district switching was finished, target BS sent the sleep Indication message that contains the zero-time of sleeping to this portable terminal.
Step 103: portable terminal is according to the sleep zero-time of target BS transmission and the sleep state parameter of self preserving, enter sleep pattern once more, and the initial sleeping window length of this sleep pattern and listen window length obtain according to sleeping window parameter before the interruption of being preserved and listen window parameter respectively.
The sleep state parameter that portable terminal is preserved in the step 101 can comprise following several situation.
A kind of situation is: the sleep state parameter comprises listening_window, final_sleep windowbase, final_sleep window exponent and interrupts preceding sleeping window length.Like this, in step 103, portable terminal can enter sleep state directly with interrupting preceding sleeping window length as initial sleeping window.And behind the sleep state, intercept according to the listening_window that is preserved.After this, when entering the sleep state under this sleep pattern once more, utilize formula (1) and (2), and the final_sleep window exponent that preserves and final_sleep window base calculate and carry out dormant sleeping window length once more and get final product.
Second kind of situation: the sleep state parameter that portable terminal is preserved comprises that initial-sleep window, listening_window, final_sleep window base, final_sleep window exponent and interruption advance into dormant number of times, promptly the k+1 time, perhaps k value.Like this, in step 103, portable terminal can utilize the k value, calculates the sleeping window length before interrupting, and the sleeping window length before will interrupting enters sleep state as initial sleeping window.
When this sleeping window finishes, enter the state of intercepting, listen window length is the listening_window that is preserved.After this, when portable terminal enters sleep state once more, utilize formula (1) and (2), and the final_sleep window exponent that preserves and final_sleep window base calculate and carry out dormant sleeping window length once more and get final product.
The third situation, if before the portable terminal disrupted sleep pattern, the sleeping window of determining self has been maximized window length, so, portable terminal can only be preserved maximized window length and listening_window gets final product in the step 101.Certainly, the sleeping window of determining self has been that the method for maximum sleeping window length is a lot of, such as, can judge double not change, can think to have reached maximum sleeping window.
And the sleep Indication message that contains the zero-time of sleeping in the step 102 can be by self-defined realization.Table 2 is depicted as an embodiment of the sleep Indication message of the present invention's definition.Ginseng is shown in Table 2, and the sleep Indication message form of present embodiment definition comprises SLPID parameter, Sleep duration parameter and TLV encoding information parameter.
In addition, in the sleep Indication message that present embodiment provides, may further include MaintainActive Set and Anchor BS ID parameter, this parameter takies a bit, when it is " 1 ", be illustrated in that MSS preserves Active set and AnchorBS ID under the sleep pattern before the SHO/FBSS timer expiry, during for " 0 ", be illustrated in and do not preserve Active set and Anchor BS ID under the sleep pattern.Therefore, portable terminal is received MOB_SLP_RSP message, if Maintain Active Set andAnchor BS ID parameter is " 1 ", when then after switching is finished, entering the sleep state in the sleep pattern once more, portable terminal is preserved Active set and Anchor BS ID before the SHO/FBSS timer expiry, and at sleeping window BS among the Active set and Anchor BS is scanned.
Syntax |
Size |
Notes |
MOB-HOSLP-IND_Message_Format(){ |
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|
Management?message?type=?? |
8bits |
The Indication message type code, temporarily uncertain |
If(SHO?or?FBSS?capability?enabled){ |
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If in register requirement/registration reply message reciprocal process, support soft handover (SHO) and fast base station to select (FBSS) function, then |
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In this message, comprise " Maintain Active Set and Anchor BS ID " parameter. |
Maintain Active Set and Anchor BS ID |
1bit |
1: under sleep pattern, MSS preserves Active set and Anchor BS ID before the SHO/FBSS timer expiry.0: under sleep pattern, do not preserve Active set and Anchor BS ID. |
If (Active Set and Anchor BS ID maintained) |
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|
SHO/FBSS duration (s) |
3bits |
If " Maintain Active Set and Anchor BS ID " parameter value is " 1 ", then in this message, comprise " SHO/FBSS duration (s) " this parameter |
} |
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|
} |
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|
Start frame |
6bits |
Begin to enter the initial frame number of sleep pattern |
Sleep duration |
8bits |
The sleep duration is a unit with the 20ms frame.During this period of time MSS can not initiatively send upstream data, and after during this period of time, MSS just can send upstream data to Serving BS. |
SLPID |
10bits |
Sleep ID number of MSS |
TLV encoded information |
|
The TLV coded message |
Padding |
Variable |
To ensure octet-aligned |
} |
|
|
Table 2
Therefore, in the present embodiment, Target BS can notify MSS to enter sleep pattern by the MOB_HOSLP_IND message of this definition.After MSS received this message, the moment of Start_frame parameter regulation therein entered sleep pattern, the sleeping window length before initial sleeping window is set to interrupt.
In a word, the above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.