CN100344093C - Downlink compression mode scheduling method - Google Patents
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Abstract
The present invention discloses a scheduling method of a downlink compression mode. In the method, when a new UE needs to start a compression mode, a frame which satisfies the lowest frequency of the compression enabled mode is searched in the TGPL period by the present invention to start the compression mode of the UE by establishing the coincidence relationship of each frame of a transmission gap period length (TGPL) and the frequency of a compression enabled mode of the frame at a network side. When the present invention is used for switching, the present invention is also applicable. Therefore, power increase caused by a compression mode is effectively reduced; the interference of a system is reduced; thus, performance reduction caused by the startup of the compression mode of the system is avoided.
Description
Technical field
The present invention relates to the compact model treatment technology, refer to a kind of dispatching method of downlink compression mode especially.
Background technology
In Wideband Code Division Multiple Access (WCDMA) (WCDMA) system, radio network controller (RNC) is after the event measurement report of receiving user terminal (UE), after the measurement result of judging RNC satisfies startup compact model condition, send message to UE and base station node B respectively by the channel reconfigure command, notify them to start compact model, carry the parameter that starts compact model in the message; Behind the response message that UE and NodeB return success, RNC sends to UE and measures control messages, requires UE to measure the signal of alien frequencies.Behind alien-frequency district, the link of former sub-district is deleted at the UE successful switch, and compact model stops with regard to corresponding; Perhaps UE reporting measurement message indicates former cell signal quality and improves, and RNC also will stop compact model.
In order to measure the cell signal of homologous ray alien frequencies and different system under the connection status, adopted the method for compact model.When needs are measured the signal of alien frequencies, dispose several time slots in certain frame or certain two continuous frames and do not send signal, allow UE in these several time slots, jump on the frequency that needs to measure from current operating frequency, do corresponding surveying work, jump back to again on the original operating frequency after measurement is finished, proceed original business.But in order to guarantee that data do not lose, the data that need these several time slots do not had to send are by the configuration compact model, send this data at other time slots of same frame.
Since condensed frame will be before sending on the less time slot data of full frame, so the signal interference ratio of down link (SIR) desired value need make corresponding adjustment, is enough to the signal of demodulation condensed frame to guarantee power that UE receives.With respect to normal frame, sir target value adjustment (SIRcm_target) descending sir target value (SIRtarget) when equaling normal frame under the compact model produces a deviant (Δ SIRcoding) sum that different mechanisms calculated in gap (Gaps) with considering compact model again with deviant (Δ SIRpilot) sum that the minimizing of considering frequency pilot sign under the compact model is calculated, and promptly can be expressed as follows:
SIRcm_target＝SIRtarget+ΔSIRpilot+ΔSIRcoding
For different network environments and measuring object, and the compression method that adopts, this several values can have different values.Generally speaking, the measurement of different system is than the deviant height of homologous ray different-frequency measure requirement.
Because compact model may cause signal transmission power that a unexpected lifting is arranged, and system is caused extra interference, especially in the place, edge of sub-district covering, the surplus of power control is smaller, and this influence will be more obvious.If in a sub-district, two or more UE start compact model simultaneously at same frame, then power ramp will add up, and the interference of system is obviously increased.Especially, there is the more UE while when same frame starts compact model in the sub-district, will causes bigger interference, cause systematic function, be subjected to bigger influence as capacity and covering, even may cause call drop system.
At present, it is not do any scheduling to handle that UE is started compact model, as long as UE starts compact model, just starts in the frame of UE correspondence.In existing WCDMA agreement, the time that each UE starts compact model is separate, and just compressed mode frame is random distribution in time, does not carry out unified scheduling.So prior art is not to carrying out the dispatching method of downlink compression mode under many UE situation.
Fig. 1 is the embodiment that prior art UE starts downlink compression mode.Generally speaking, all UE use same set of compressed-mode parameter in sub-district.The measurement of UE under compact model is to carry out in the cycle with transmission interval cycle length (TGPL), and each cycle is finished one group of measurement, has a plurality of compressed mode frames, and the value in TGPL cycle is according to deciding for the parameter of cell configuration.
Here suppose that a TGPL has eight frames in the cycle.Fig. 1 empty lattice represents not have UE to start the frame of compact model, i.e. normal frame; Hypographous lattice represents to have UE to start the frame of compact model, i.e. condensed frame among Fig. 1.
As can be seen from Figure 1, in the cycle, five UE being arranged at a TGPL, is respectively UE1, UE2, UE3, UE4, UE5, and they have all started downlink compression mode simultaneously on second frame.Because it is separate that each UE starts the time of compact model, just compressed mode frame is random distribution in time, do not carry out unified scheduling,, promptly in second frame, started compact model so these five states that UE is the most extreme are to start compact model in same frame.
The down link sir target value of such five UE has promoted the value of Δ SIRpilot and Δ SIRcoding addition simultaneously at synchronization, and behind the compact model frame end, the sir target value reduces the value of Δ SIRpilot and Δ SIRcoding addition again simultaneously, concerning system, can cause of short duration larger interference, simultaneously also bigger power fluctuation can appear for transmitter, the spike that causes power is unfavorable for the maximization of the stable and efficient of systematic function.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of dispatching method of downlink compression mode, and this method can reduce because a plurality of UE start the influence of compact model to system simultaneously, thereby can improve systematic function.
For achieving the above object, technical scheme of the present invention specifically is achieved in that
A kind of dispatching method of downlink compression mode is set up each frame and the corresponding relation that starts the compact model number of times in frame among the transmission interval cycle length T GPL, and this method also comprises the steps:
A. there is UE need start downlink compression mode if RNC judges, then enters step B; There is UE to stop to start downlink compression mode if RNC judges, then enters step D; Do not have UE to stop to start downlink compression mode yet, return steps A if both have UE need start downlink compression mode;
B. search the compact model that the frame that has started the compact model least number of times starts this UE in the cycle at TGPL;
C. increase the compact model number of times of startup and the record of this frame correspondence, return steps A then;
D. reduce compact model number of times of startup and record that this UE starts compact model place frame correspondence, return steps A then.
The described method of searching of step B comprises: begin to search one by one frame that starts the compact model least number of times and the compact model that starts this UE the frame that satisfies condition at first from the present frame of UE correspondence.
Described corresponding relation is: network side according to the TGPL of the system cycle in a database table setting up of the maximum of number of frame;
The method that starts the compact model number of times that record reduces described in compact model number of times or the step D that starts that record increases described in the step C comprises: the number of times that will start compact model is recorded in this database table.
The maximum of described TGPL number of frame in the cycle is determined according to the parameter of cell configuration.
Corresponding frame of index in the described database table is deposited in the form of each index correspondence and has been started the compact model number of times in this frame.
The method of the compact model of described this UE of startup comprises: RNC sends the scheduling message that starts compact model to UE and NodeB respectively, and behind the response message that UE and NodeB return success, RNC sends to UE and measures control messages, starts the compact model of this UE.
After UE starts compact model soft handover takes place, RNC sends the compact model relevant parameter of UE in former sub-district to the purpose sub-district, and UE basis in the purpose sub-district is dispatched at the compact model relevant parameter of former sub-district then.
When there is a plurality of branches sub-district described purpose sub-district, RNC chooses a branch sub-district of load maximum in the described purpose sub-district, and sending the compact model relevant parameter of a branch sub-district of this load maximum to each branch sub-district, each branch's sub-district compact model adopts the compact model relevant parameter of a branch sub-district of this load maximum to dispatch.
As seen from the above technical solutions, when the present invention starts the UE different-frequency measure at network side, according to the condensed frame situation that has started compact model in the sub-district, initiatively stagger the regular hour with these compressed mode frames, make different UEs start compact model at the different frame place, thereby compressed mode frame is evenly distributed on the time domain.Like this, reduced the power ramp that causes because of compact model effectively, reduced the interference of system, thereby avoided system because the performance that compression mode starting causes reduces.
The present invention is suitable equally when switching.If after starting compact model soft handover takes place, the situation of former sub-district is followed in the purpose sub-district on the scheduling parameter of compact model so, in when, promptly soft handover taking place, the scheduling relevant parameter of the compact model of this sub-district continues to finish corresponding compact model scheduling according to these parameters in the purpose sub-district by the purpose sub-district that RNC is transferred to switching.Under the situation that a plurality of soft handover purpose branch sub-district is arranged, compact model scheduling parameter according to the sub-district of load maximum in the purpose branch sub-district starts the compact model measurement, and the scheduling parameter of other purpose sub-district compact models is followed the parameter of this sub-district and carried out the scheduling of compact model.
Description of drawings
Fig. 1 is the embodiment that prior art UE starts downlink compression mode;
Fig. 2 is the scheduling flow figure of compact model of the present invention;
Fig. 3 is the embodiment that UE of the present invention starts downlink compression mode.
Embodiment
Core concept of the present invention is: by set up TGPL existing corresponding relation that starts the compact model number of times in each frame and this frame in the cycle at network side, when new UE need start compact model, the present invention searched in the cycle at TGPL and satisfies the compact model that the frame that starts the compact model least number of times starts this UE at first.
Fig. 2 is the scheduling flow figure of compact model of the present invention, and concrete job step is as follows:
Step 200: when system start-up, set up TGPL each frame and the corresponding relation that in frame, starts the compact model number of times in the cycle.
Can set up a database table in this step, the size of database table is the maximum of TGPL frame in the cycle, corresponding frame of index in the table is deposited in the form of each index correspondence and has been started the compact model number of times in this frame, has promptly started the quantitative value of the UE of compact model in this frame.Here the maximum of TGPL frame in the cycle is a determined value after the parameter of cell configuration is determined.
Step 201:RNC has judged whether that according to UE reporting measurement result the UE needs start compact model or have UE to stop compact model, does not judge in this step if continue; If there is UE need start compact model, then execution in step 202; If there is UE to stop compact model, then execution in step 205.
Step 202: search the frame that starts the compact model minimum number in the cycle at TGPL.
In this step preferably from UE and TGPL the cycle corresponding present frame begin to search can satisfy condition at first and start the frame of compact model, do like this and improved the efficient of searching.Here can be to begin order from present frame to search backward or forward.
From step 202 as can be seen, reduced a plurality of UE like this and started the probability of compact model in the cycle in the same frame at TGPL, can UE be distributed in fifty-fifty in TGPL each frame in the cycle well and start compact model, obviously reduced adding up of power ramp, the interference of system has also obviously been reduced.
Step 203: the compact model that starts this UE in the frame that in previous step is rapid, finds.
In this step, RNC sends message to UE and NodeB respectively by the channel reconfigure command, notifies them to start compact model, carries the scheduling parameter that the present invention starts compact model in the message; Behind the response message that UE and NodeB return success, RNC sends to UE and measures control messages, requires UE to measure the signal of alien frequencies, promptly starts the compact model of UE.
Step 204: the compact model of the startup number of times of frame correspondence that will start the compact model of this UE adds one.
The compact model number of times of depositing in the form with this frame manipulative indexing in database table in this step that started in this frame adds one.
Step 205: the compact model of the startup number of times of frame correspondence that will stop the UE place of compact model subtracts one.
In this step, behind the UE successful switch, or after the recovery normally of the signal of this sub-district, UE can occur and stop compact model.At this moment, the compact model number of times of depositing in the form with frame manipulative indexing in database table at this UE place that started in this frame subtracts one.
Scheduling flow from the invention described above compact model, as can be seen, particularly at the WCDMA networking initial stage, under the situation of 2G and 3G coexistence of systems or the limited place of 3G covering, more alien frequencies and isosystem measurement will be had, adopt the method will reduce the power ramp amplitude that causes because of compact model, reduce system interference, thus the decline of having avoided systematic function when compression mode starting, to cause.
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing preferred embodiment that develops simultaneously, the present invention is described in more detail.
Fig. 3 is the embodiment that UE of the present invention starts downlink compression mode.Here suppose that a TGPL has eight frames in the cycle.Fig. 3 empty lattice represents not have UE to start the frame of compact model, i.e. normal frame; Hypographous lattice represents to have UE to start the frame of compact model, i.e. condensed frame among Fig. 3.In conjunction with the scheduling flow of Fig. 2 compact model of the present invention, the present invention a TGPL in the cycle to five needs start compact models UE specifically be performed such scheduling:
At first, suppose TGPL respectively corresponding eight index of eight frames in the cycle, and set up the database table that has started the corresponding relation of compact model number of times in eight index and each frame.The initial condition of database table is: deposit the number of times that has started compact model in first frame in the form of the index T1 correspondence of first frame, promptly start the number N1 of the UE of compact model, N1 equals zero.By that analogy, deposit the number of times that has started compact model in the i frame in the form of the index Ti correspondence of i frame, promptly start the number Ni of the UE of compact model, Ni equals zero.I from 2 to 8 in the present embodiment.Table 1 has shown the corresponding relation of index and the number of the UE that has started compact model after the initialization:
| Index | Started the number of the UE of compact model |
| T1 | N1＝0 |
| T2 | N2＝0 |
| T3 | N3＝0 |
| T4 | N4＝0 |
| T5 | N5＝0 |
| T6 | N6＝0 |
| T7 | N7＝0 |
| T8 | N8＝0 |
Table 1
When RNC detects the UE1 that needs the startup compact model, suppose that UE1 is corresponding to second frame of TGPL in the cycle at this moment, from TGPL the cycle second frame begin to search the frame that has started the compact model least number of times, before this owing to start compact model without any UE, so N1=0, N2=0, N3=0, N4=0, N5=0, N6=0, N7=0, N8=0, as shown in table 1, system is by searching database table, starts the compact model of UE1 at second frame of full first condition.
Then, N2 is added one, i.e. N2=1.At this moment, index is as shown in table 2 with the corresponding relation of the number of the UE that starts compact model:
| Index | Started the number of the UE of compact model |
| T1 | N1＝0 |
| T2 | N2＝1 |
| T3 | N3＝0 |
| T4 | N4＝0 |
| T5 | N5＝0 |
| T6 | N6＝0 |
| T7 | N7＝0 |
| T8 | N8＝0 |
Table 2
RNC continues to detect whether the UE that needs to start compact model is arranged, when RNC detects the UE2 that needs the startup compact model, suppose that UE2 is corresponding to seven frame of TGPL in the cycle at this moment, from TGPL the cycle the 7th frame begin to search the frame that has started the compact model least number of times, before this because UE1 has started compact model in second frame, so N1=0, N2=1, N3=0, N4=0, N5=0, N6=0, N7=0, N8=0, as shown in table 2, system starts the compact model of UE2 by searching database table at the 7th frame that satisfies condition at first.At this moment, index is as shown in table 3 with the corresponding relation of the number of the UE that starts compact model:
| Index | Started the number of the UE of compact model |
| T1 | N1＝0 |
| T2 | N2＝1 |
| T3 | N3＝0 |
| T4 | N4＝0 |
| T5 | N5＝0 |
| T6 | N6＝0 |
| T7 | N7＝1 |
| T8 | N8＝0 |
Table 3
In the present embodiment, when needs start compact model, suppose UE3 corresponding to TGPL second frame in the cycle, UE4 is corresponding to TGPL second frame in the cycle, and UE5 is corresponding to TGPL second frame in the cycle.So, according to the method described above, UE3 starts compact model in the 3rd frame, UE4 starts compact model in the 4th frame, UE5 starts compact model in the 5th frame, such five UE same TGPL in the cycle by the time startup compact model that staggers, index is as shown in table 4 with the corresponding relation of the number of the UE that has started compact model:
| Index | Started the number of the UE of compact model |
| T1 | N1＝0 |
| T2 | N2＝1 |
| T3 | N3＝1 |
| T4 | N4＝1 |
| T5 | N5＝1 |
| T6 | N6＝0 |
| T7 | N7＝1 |
| T8 | N8＝0 |
Table 4
Clearly, have only the risen value of Δ SIRpilot and Δ SIRcoding sum of a UE in the descending sir target value of synchronization, so base station down power will big increase can not occur, and make the fluctuation of base station down power reduce to minimum simultaneously, reduce system interference, improved systematic function.
Behind alien-frequency district, the link of former sub-district is deleted at the UE successful switch, and compact model stops with regard to corresponding, and this method subtracts one with the compact model of the startup number of times that this UE starts the frame correspondence at compact model place.
If the UE2 in the foregoing description has carried out soft handover after starting compact model, so, RNC will be transferred to the purpose sub-district that switches to the relevant parameter that UE2 carries out compact model scheduling among the present invention, UE2 carries out corresponding compact model scheduling in the purpose sub-district, promptly in the purpose sub-district, start compact model in the 3rd frame in the cycle at TGPL.
Under the situation that a plurality of soft handover purpose branch sub-district is arranged, the monitoring information that RNC returns by NodeB to the cell operation situation, select the sub-district of load maximum in current each purpose branch, it is the sub-district of power consumption ratio maximum, RNC sends to other branch sub-district respectively with the compact model scheduling parameter of the branch sub-district of this load maximum, makes all purpose branch sub-districts all adopt this compact model scheduling parameter to carry out the scheduling of compact model.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (8)
1. the dispatching method of a downlink compression mode is characterized in that, sets up each frame and the corresponding relation that starts the compact model number of times in frame among the transmission interval cycle length T GPL, and this method also comprises the steps:
A. there is user's terminal UE need start downlink compression mode if radio network controller (RNC) is judged, then enters step B; There is UE to stop to start downlink compression mode if RNC judges, then enters step D; Do not have UE to stop to start downlink compression mode yet, return steps A if both have UE need start downlink compression mode;
B. search the compact model that the frame that has started the compact model least number of times starts this UE in the cycle at TGPL;
C. increase the compact model number of times of startup and the record of this frame correspondence, return steps A then;
D. reduce compact model number of times of startup and record that this UE starts compact model place frame correspondence, return steps A then.
2. method according to claim 1 is characterized in that, the described method of searching of step B comprises: begin to search one by one frame that starts the compact model least number of times and the compact model that starts this UE the frame that satisfies condition at first from the present frame of UE correspondence.
3. method according to claim 1 is characterized in that, described corresponding relation is: network side according to the TGPL of the system cycle in a database table setting up of the maximum of number of frame;
The method that starts the compact model number of times that record reduces described in compact model number of times or the step D that starts that record increases described in the step C comprises: the number of times that will start compact model is recorded in this database table.
4. method according to claim 3 is characterized in that: the maximum of described TGPL number of frame in the cycle is determined according to the parameter of cell configuration.
5. method according to claim 3 is characterized in that: corresponding frame of index in the described database table, and deposit in the form of each index correspondence and started the compact model number of times in this frame.
6. method according to claim 1 and 2, it is characterized in that, the method of the compact model of described this UE of startup comprises: RNC sends the scheduling message that starts compact model to UE and base station node B respectively, behind the response message that UE and NodeB return success, RNC sends to UE and measures control messages, starts the compact model of this UE.
7. method according to claim 1, it is characterized in that: after UE starts compact model, soft handover takes place, RNC sends the compact model relevant parameter of UE in former sub-district to the purpose sub-district, and UE basis in the purpose sub-district is dispatched at the compact model relevant parameter of former sub-district then.
8. method according to claim 7, it is characterized in that: when there is a plurality of branches sub-district described purpose sub-district, RNC chooses a branch sub-district of load maximum in the described purpose sub-district, and sending the compact model relevant parameter of a branch sub-district of this load maximum to each branch sub-district, each branch's sub-district compact model adopts the compact model relevant parameter of a branch sub-district of this load maximum to dispatch.
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| US20030108013A1 (en) * | 2001-11-19 | 2003-06-12 | Samsung Electronics Co., Ltd. | Method and apparatus for uplink transmission power control in a CDMA communication system |
| CN1426172A (en) * | 2001-12-12 | 2003-06-25 | 华为技术有限公司 | Method for controlling downward special physical channel power under compressed mode |
| CN1429032A (en) * | 2001-12-24 | 2003-07-09 | 华为技术有限公司 | Open-loop power control method in switching process between frequencies |
| JP2003348012A (en) * | 2002-05-23 | 2003-12-05 | Ntt Docomo Inc | Method for controlling transmission power in soft handover and radio controller |
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| CN1357984A (en) * | 2000-12-05 | 2002-07-10 | 华为技术有限公司 | Compresision mode control method of CDMA system |
| CN1399426A (en) * | 2001-07-20 | 2003-02-26 | 华为技术有限公司 | Regulation method of power-controlling time interval set in compression mode |
| US20030108013A1 (en) * | 2001-11-19 | 2003-06-12 | Samsung Electronics Co., Ltd. | Method and apparatus for uplink transmission power control in a CDMA communication system |
| CN1426172A (en) * | 2001-12-12 | 2003-06-25 | 华为技术有限公司 | Method for controlling downward special physical channel power under compressed mode |
| CN1429032A (en) * | 2001-12-24 | 2003-07-09 | 华为技术有限公司 | Open-loop power control method in switching process between frequencies |
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