CN101388691A - Method and apparatus for power control - Google Patents
Method and apparatus for power control Download PDFInfo
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- CN101388691A CN101388691A CNA2007101216893A CN200710121689A CN101388691A CN 101388691 A CN101388691 A CN 101388691A CN A2007101216893 A CNA2007101216893 A CN A2007101216893A CN 200710121689 A CN200710121689 A CN 200710121689A CN 101388691 A CN101388691 A CN 101388691A
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Abstract
The implement of the invention discloses a method for controlling power, which comprises: judging the type of a communication channel which needs power control and selecting a corresponding power control strategy to control and synchronize power for the communication channel which needs power control according to the judging result. The implement of the invention discloses a device for controlling the power, which comprises a judging module and a control module. In the method and the device which are provided by the implement of the invention, since existing communication channel resources are fully utilized to control the power of each communication channel, thereby the power control effect to each communication channel is improved, and corresponding communication channel resources also can be saved simultaneously. Furthermore, the allocation of each communication channel to control power is more flexible.
Description
Technical field
The present invention relates to mobile communication technology, refer in particular to a kind of method and apparatus of power control.
Background technology
In order to adapt to the rapid growth of data service among the mobile network, at TD SDMA (TD-SCDMA, Time Division Synchronous Code Division Multiple Access) introduced high speed downlink packet access (HSDPA respectively in the technology, High Speed Downlink PackageAccess) technology and high speed uplink packet insert (HSUPA, High Speed Uplink Package Access) technology, above-mentioned two technology can be collectively referred to as the HSPA technology.
In the HSDPA technology, increased high speed descending sharing channel (HS-DSCH newly, High SpeedDownlink Shared Channel), be mapped to high-speed physical downlink shared channel (HS-PDSCH) (HS-PDSCH, HighSpeed Physical Downlink Shared Channel) on, is used to carry high-speed down data.Wherein, HS-PDSCH is responsible for carrying the data of HS-DSCH, simultaneously also can bearer control signalling.For the signaling of supporting that HSDPA is relevant, system has also increased by two physical channels: high speed descending sharing channel shared control channel (HS-SCCH, Shared Control Channel for HS-DSCH), high speed descending sharing channel is shared information channel (HS-SICH, Shared Information Channel for HS-DSCH), by base station (NodeB) control, be used to transmit the control information relevant and the feedback information of terminal with HS-DSCH or HS-PDSCH.
In the HSUPA technology, increased a dedicated channel newly, i.e. uplink dedicated transmission channel (E-DCH of Zeng Qianging, Enhanced Dedicated Channel), be mapped to the enhancing uplink physical channel (E-PUCH that increases newly, Enhanced Uplink Physical Channel) on, is used to carry the high speed uplink data.Wherein, E-PUCH is responsible for carrying the data of E-DCH, simultaneously also can bearer control signalling.In addition, the HSUPA technology has also been introduced two new physical channels in physical layer: E-DCH mixed automatic re-transmission indicating channel (E-HICH, E-DCH Hybrid ARQ Indicator Channel) and E-DCH absolute grant channel (E-AGCH, E-DCH Absolute Grant Channel).Wherein, E-HICH is responsible for the response information transmission (for example, ACK/NACK etc.) in the transmitting HARQ process; E-AGCH is responsible for transmitting base station scheduling information, the distribution of scheduling resource.The transfer resource of E-DCH is distributed by E-AGCH by base station (Node B), subsequently by E-HICH echo reply information.In the HSUPA technology, generally will set up relevant resource of non-scheduling (Non-scheduled) and the relevant resource of scheduling (Scheduled) simultaneously for a subscriber equipment (UE).Therefore, the channel resource of E-DCH can be divided into scheduling and two classes non-scheduling, and is corresponding, and the E-PUCH channel resource also can be divided into scheduling and two classes non-scheduling; But owing to have only the E-AGCH of scheduling, and do not have the E-AGCH of non-scheduling, therefore E-AGCH is not done differentiation.
According to the 3GPP agreement, in actual application environment, the scene of normally used HSPA has following described several:
Scene 1, in this scene, comprise: the E-DCH of scheduling, the E-DCH of non-scheduling, uplink special physical channel (DPCH, Dedicated Physical Channel) and descending DPCH.Wherein, the E-DCH of scheduling (being mapped on the E-PUCH of scheduling) is used for transmitting up business; E-DCH of non-scheduling (being mapped on the E-PUCH of non-scheduling) and descending DPCH are used for transmitting signaling and guarantee rate business, and up DPCH only is used for to descending DPCH rate of doing work control.In addition, the control corresponding channel that is disposed in this scene is: the E-HICH of E-AGCH, non-scheduling and the E-HICH of scheduling.
Scene 2, in this scene, comprise: the E-DCH of HS-PDSCH, scheduling and the E-DCH of non-scheduling.Wherein, HS-PDSCH is the Traffic Channel of HSDPA, is used for transmitting downlink signaling and business; The E-DCH of scheduling is used for transmitting up business, and the E-DCH of non-scheduling is used for transmitting up signaling and guarantees rate business.In addition, control corresponding channel: HS-SCCH, HS-SICH, E-AGCH, the E-HICH of non-scheduling and the E-HICH of scheduling have also been disposed in this scene.
Scene 3: in this scene, comprise: HS-PDSCH, up DPCH and descending DPCH.Wherein, HS-PDSCH and up DPCH are used for transmitting signaling and business, and descending DPCH only is used for to up DPCH rate of doing work control.In addition, control corresponding channel: HS-SCCH and HS-SICH have also been disposed in this scene.
And in the prior art, according to 3rd Generation Partnership Project (3GPP, 3rdGeneration Partnership Project) agreement, the power control relation in the HSPA technology is:
1) E-PUCH carries out power control to E-AGCH;
2) E-HICH of non-scheduling or E-AGCH carry out power control to E-PUCH;
3) carry out power control between descending DPCH and the up DPCH mutually;
4) carry out power control between HS-SCCH and the HS-SICH mutually.
By above power control relation as can be known, because in same Transmission Time Interval (TTI), the E-PUCH of non-scheduling and E-AGCH can not exist simultaneously, so the E-PUCH that in fact uses non-scheduling is to E-AGCH channel power control (abbreviation power control, down together) nonsensical, therefore transmitting power control (TPC, Transmitter Power Control) command word of transmitting in the E-PUCH of non-scheduling does not play the power control effect; In addition, all there is not power control for the E-HICH of HS-PDSCH, non-scheduling and the E-HICH of scheduling; And the TPC command word of all not carrying out power control among the E-HICH of scheduling and the HS-PDSCH.
Therefore, in the prior art, there is following problem in the Poewr control method relevant with HSPA: on the one hand, channel resource (comprising the TPC command word that comprises in the channel) utilance is too low; On the other hand, bad to the effect of the power of some channels control, and to some channel even there is not power control.Specifically, can be summarized as several problems as described below:
Summary of the invention
In view of this, the main purpose of the embodiment of the invention is to provide a kind of method and apparatus of power control, thereby obtains better power control effect.
For achieving the above object, the technical scheme in the embodiment of the invention is achieved in that
A kind of method of power control, this method comprises:
Judge required type of carrying out the channel of power control;
According to described judged result, select corresponding power control strategy that the required channel that carries out power control is carried out power control and synchronous.
A kind of device of power control also is provided in the embodiments of the invention, and this device comprises: judge module and control module;
Described judge module is used for required type of carrying out the channel of power control is judged, judged result is sent to control module;
Described control module is used for according to received judged result, selects corresponding power control strategy that the required channel that carries out power control is carried out power control and synchronous.
A kind of method and apparatus of power control is provided in the embodiments of the invention in summary.In the method and apparatus that the embodiment of the invention provided, because having made full use of existing channel resource comes each channel is carried out power control, therefore in the power control effect that improves each channel, also can save corresponding channel resources (for example, up DPCH or the shared channel resource of descending DPCH).In addition, can make that also to carry out the configuration of power control for each channel more flexible.
Description of drawings
Fig. 1 is the flow chart of the method for power control in the embodiment of the invention.
Fig. 2 is the schematic representation of apparatus of power control in the embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention express clearlyer, the present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
Fig. 1 is the flow chart of the method for power control in the embodiment of the invention.As shown in Figure 1, the method for power control in embodiments of the present invention comprises step as described below:
Promptly judge that according to channel logo the required channel that carries out power control is up DPCH, descending DPCH, E-PUCH, E-HICH, E-AGCH or other channel.
In step 102, described corresponding power control strategy comprises: according to concrete channel situation, select the lighter channel of idle channel or load that the required channel that carries out power control is carried out power control.Concrete power control strategy will be described in detail in each embodiment subsequently.
First preferred embodiment: when the required channel that carries out power control is descending DPCH, use the E-PUCH of non-scheduling and/or the E-PUCH of scheduling to replace up DPCH that descending DPCH is carried out power control and synchronous.
Below, will further introduce the specific embodiments of described first preferred embodiment:
Using the TPC command word among the E-PUCH of non-scheduling is descending DPCH power control, and only uses the TPC command word among the E-PUCH that dispatches to control as the E-AGCH power.
Specifically, because stipulate in agreement TS25.224: UE should be provided with the TPC command word and come the power of E-AGCH is controlled in E-PUCH.But, because the E-DCH that E-AGCH only is used for dispatching transmits, so only need use the TPC command word that comprises among the E-PUCH of scheduling just to can be the control of E-AGCH power, and need not to use the TPC command word that is comprised among the E-PUCH of non-scheduling to control as the E-AGCH power; In addition, in the prior art, up DPCH only is used for transmitting the command word to descending DPCH rate of doing work control, and therefore, if collocating uplink DPCH, then the utilance to resource is too low; And if collocating uplink DPCH not then will lack power control to descending DPCH.
Therefore, can solve above-mentioned problem by following method: promptly UE sends the TPC command word that is used for descending DPCH power control in the E-PUCH of non-scheduling, network side parses above-mentioned TPC command word from the E-PUCH of non-scheduling, be used for to descending DPCH power control; Simultaneously, UE sends the TPC command word that is used for the control of E-AGCH power in the E-PUCH of scheduling, and network side parses the TPC command word from the E-PUCH of scheduling, be used for the E-AGCH power is controlled.
In addition, also can use the E-PUCH of non-scheduling and/or the E-PUCH of scheduling to replace up DPCH that descending DPCH is carried out synchronously.
At this moment, because collocating uplink DPCH again, thereby code source saved; And because UE has the restriction of uplink capacity, for example restriction of the physical channel number of every time slot, so also help improving for configuration flexibility after saving up DPCH.
In above-mentioned method, need make amendment to agreement TS25.224, and the part of concrete amended agreement TS25.224 is:
E-AGCH power control section branch: for 1.28Mcps TDD, UE is provided with the TPC command word and controls the E-AGCH through-put power in the E-PUCH of scheduling.
Descending DPCH power control section branch: UE generates the TPC command word according to the quality objective of high level setting, transmitting power with control node B, the TPC command word is in the combination of transmitted channel (CCTrCHs, Coded Composite Transport Channel) of relevant up coding
It perhaps is non-scheduling Transmit among the E-PUCH
More than shown in sign have the part of underscore to be modification content to agreement.
In addition, when resource cycle indication (RDI, resource duration indicator) existed and greater than 1 o'clock, can use the TPC command word among the E-PUCH of first scheduling after each E-AGCH to control as the E-AGCH power; And use the TPC command word among other the E-PUCH of scheduling is descending DPCH power control.
Certainly, TPC command word in the E-DCH of above-mentioned use scheduling is when descending DPCH power is controlled, still can use the TPC command word among the E-DCH of non-scheduling simultaneously is descending DPCH power control, thereby further improves the power control effect for descending DPCH.
Second preferred embodiment: when the required channel that carries out power control is E-PUCH, use E-HICH or descending DPCH or HS-PDSCH that E-PUCH is carried out power control and synchronous.
Below, will further introduce the specific embodiments of described second preferred embodiment:
2.1, use the TPC command word among the E-HICH to come E-PUCH is carried out power control, perhaps use the TPC command word among E-AGCH and the E-HICH to come E-PUCH is carried out power control.
Owing to do not have TPC command word and SS among the E-HICH of scheduling, therefore also need are made amendment to the physical channel structure of the E-HICH of scheduling, add TPC command word and SS, the physical channel structure of the E-HICH of described amended scheduling can adopt the physical channel structure identical with the E-HICH of non-scheduling.
In the present embodiment, can realize by two kinds of methods as described below E-PUCH is carried out power control:
1) can be to the basic performance number P of E-PUCH
E-baseThe control of employing closed power is therefore to control P
E-baseThe TPC command word be set as follows: in the Transmission Time Interval (TTI) of an E-PUCH, if transmit data among the E-AGCH, then by E-AGCH transmission TPC command word; If do not transmit data among the E-AGCH, and transmission during data, then by E-HICH transmission TPC command word among the E-HICH.
2) directly by the TPC command word transmitted among the E-HICH basic performance number P to E-PUCH
E-baseCarry out closed power control.
2.2, when having disposed descending DPCH, use the TPC command word among the descending DPCH to carry out power control to the E-PUCH of scheduling or to E-PUCH (promptly comprising the E-PUCH of scheduling and the E-PUCH of non-scheduling).Therefore (DTX, DiscontinuousTransmission) process and special burst (special burst) can guarantee the effect of power control because descending DPCH has discontinuous transmission.
2.3, in scene 2, use the TPC command word among the HS-PDSCH that E-PUCH is carried out power control.
In addition, in scene 3, also can use the TPC command word among the HS-PDSCH that up DPCH is carried out power control.
Owing to do not have TPC command word and simultaneous bias signal (SS in the physical channel structure of HS-PDSCH, Synchronisation Shift), so also need the physical channel structure of HS-PDSCH is made amendment, add TPC command word and/or SS, the physical channel structure of described amended HS-PDSCH can be referring to table 1 as follows:
Table 1
Listed 12 kinds of structure of time slot in the table 1, wherein, Slot Format is a time slot format; SF is a spreading factor; Midamble length is a training sequence length, and unit is chip (chip); N
TFCI code wordBe transformat combination indication (TFCI) bit number; N
SSBe the SS bit number; N
TPCBe the TPC bit number; N
Bits/SlotBe every time slot bit number; N
Data/SlotBe every time slot data bit number; N
Data/data field (1)It is the data bit number of first data field; N
Data/data field (2)It is the data bit number of second data field; QPSK is a quadrature transposition keying; 16QAM is 16 quadrature amplitude modulation.
The 3rd preferred embodiment: when the required channel that carries out power control be in the same time slot comprise the channel set of at least two equidirectional channels the time, with the some channels in the described channel set is the benchmark physical channel, the difference power of each non-benchmark physical channel and benchmark physics interchannel in the calculating channel set; Described benchmark physical channel is carried out power control,, each non-benchmark physical channel is carried out power control according to the power that carries out the benchmark physical channel after power is controlled and the difference power of described each non-benchmark physical channel and benchmark physics interchannel.
Specifically, when a plurality of equidirectional (promptly all be up or all be descending) physical channel during at same time slot, can be with the some physical channels in this time slot as the benchmark physical channel, the power of benchmark physical channel is made as reference power value P, other the power of equidirectional i physical channel in the same time slot is made as P
i(i=1,2 ...), with P
iBe made as OFFSET with the difference of P
i, i.e. P
i=P+OFFSET
i(i=1,2 ...).Described OFFSET
iCan define by physical layer, also can dispose by high level.At this moment, only need this benchmark physical channel is carried out power control, add OFFSET on the reference power value P after carrying out power control
iJust can get the performance number P ' after the power control of carrying out of i physical channel
i
According to above-mentioned method, following described several execution modes can be arranged:
1, E-AGCH and E-HICH (UE has a plurality of E-HICH) are configured in same time slot, as the benchmark physical channel, the power of E-AGCH is as reference power value P with E-AGCH.The power P of i E-HICH
iP differs OFFSET with the reference power value
i, i.e. P
i=P+OFFSET
i(i=1,2 ...).OFFSET
iCan define perhaps high-rise configuration by physical layer.Owing in present agreement, can carry out power control to E-AGCH, but E-HICH do not had power control.Therefore, by using the said method that is provided in the present embodiment can improve power control performance to E-HICH.
2, in scene 1, any two or more physical channels among the E-HICH of the E-HICH of descending DPCH, E-AGCH, non-scheduling and scheduling are configured in same time slot, with some physical channels wherein is the benchmark physical channel, uses certain of E-PUCH of the E-PUCH of non-scheduling and scheduling to make up the benchmark physical channel is carried out power control.For other physical channel, then the difference OFFSET according to this physical channel and benchmark physics interchannel comes this physical channel power control.
3, in scene 2, any two or more physical channels among the E-HICH of the E-HICH of HS-SCCH, E-AGCH, non-scheduling and scheduling are configured in same time slot, so that wherein some physical channels are as the benchmark physical channel, certain of the E-PUCH of use HS-SICH, non-scheduling and the E-PUCH of scheduling makes up the benchmark physical channel is carried out power control.For other physical channel, then the difference OFFSET according to this physical channel and benchmark physics interchannel comes this physical channel power control.
In addition, in scene 2, can also be configured in same time slot to any two or more physical channels among the E-PUCH of the E-PUCH of HS-SICH, non-scheduling and scheduling, with wherein some be the benchmark physical channel, use certain of E-HICH of the E-HICH of HS-SCCH, E-AGCH, non-scheduling and scheduling to make up the benchmark physical channel carried out power control.For other physical channel, then the difference OFFSET according to this physical channel and benchmark physics interchannel comes this physical channel power control.
4, in scene 3, up DPCH and HS-SICH are configured in same time slot, with HS-SICH the benchmark physical channel, use HS-SCCH to come the benchmark physical channel is carried out power control.Up DPCH then comes this physical channel power control according to the difference OFFSET between itself and the HS-SICH.Therefore, during the method stated in the use, do not need configurating downlink DPCH, thereby improved the utilance of resource.
In 4 kinds of above-mentioned execution modes, described certain combination is defined as: choose the physical channel of some arbitrarily from the set of described physical channel, make up by certain algorithm then.
Fig. 2 is for carrying out the schematic representation of apparatus of power control in the embodiment of the invention.As shown in Figure 2, the device that carries out power control in the embodiment of the invention comprises: judge module 201 and control module 202.
Described judge module 201 is used for required type of carrying out the channel of power control is judged, judged result is sent to control module 202;
Described control module 202 is used for according to received judged result, selects corresponding power control strategy that the required channel that carries out power control is carried out power control.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1, a kind of method of power control is characterized in that this method comprises:
Judge required type of carrying out the channel of power control;
According to described judged result, select corresponding power control strategy that the required channel that carries out power control is carried out power control and synchronous.
2, method according to claim 1 is characterized in that, described the required channel that carries out power control is carried out power control and comprises synchronously:
When the required channel that carries out power control is descending DPCH, use the E-PUCH of non-scheduling and/or the E-PUCH of scheduling to replace up DPCH that descending DPCH is carried out power control and synchronous.
3, method according to claim 2 is characterized in that, the E-PUCH of the non-scheduling of described use and/or the E-PUCH of scheduling replace up DPCH that descending DPCH is carried out power control and comprise synchronously:
When resource cycle indication greater than 1 the time, using TPC command word among the E-PUCH of non-first scheduling after the E-AGCH and simultaneous bias signal is that descending DPCH carries out power control and synchronously.
4, method according to claim 3 is characterized in that, the E-PUCH of the non-scheduling of described use and/or the E-PUCH of scheduling replace up DPCH that descending DPCH is carried out power control and also further comprise synchronously:
When resource cycle indication greater than 1 the time, using TPC command word among the E-PUCH of non-scheduling and simultaneous bias signal is that descending DPCH carries out power control and synchronously.
5, method according to claim 1 is characterized in that, described the required channel that carries out power control is carried out power control and comprises synchronously:
When the required channel that carries out power control is E-PUCH, use E-HICH or descending DPCH or HS-PDSCH that E-PUCH is carried out power control and synchronous.
6, method according to claim 1 is characterized in that, described the required channel that carries out power control is carried out power control and comprises synchronously:
When the required channel that carries out power control is E-PUCH, use E-HICH and E-AGCH that E-PUCH is carried out power control and synchronous.
7, method according to claim 6 is characterized in that, described use E-HICH and E-AGCH carry out power control to E-PUCH and comprise synchronously:
In the Transmission Time Interval of an E-PUCH, when transmitting data among the E-AGCH,, E-PUCH is carried out power control and synchronous by E-AGCH transmission TPC command word and simultaneous bias signal;
In E-AGCH, do not transmit data, and transmission during data among the E-HICH,, E-PUCH is carried out power control and synchronously then by E-HICH transmission TPC command word and simultaneous bias signal.
8, according to claim 5,6 or 7 described methods, it is characterized in that this method also further comprises:
In the E-HICH physical channel structure of scheduling, add TPC command word and simultaneous bias signal;
Perhaps, the physical channel structure of the E-HICH of scheduling adopts the physical channel structure identical with the E-HICH of non-scheduling.
9, method according to claim 1 is characterized in that, described the required channel that carries out power control is carried out power control and comprises synchronously:
When the required channel that carries out power control is up DPCH, use HS-PDSCH that up DPCH is carried out power control and synchronous.
10, according to claim 5 or 9 described methods, it is characterized in that this method also further comprises:
In the HS-PDSCH physical channel structure, add TPC command word and simultaneous bias signal.
11, method according to claim 1 is characterized in that, described the required channel that carries out power control is carried out power control and comprises synchronously:
When the required channel that carries out power control be in the same time slot comprise the channel set of at least two equidirectional channels the time, with any one channel in the described channel set is the benchmark physical channel, the difference power of each non-benchmark physical channel and benchmark physics interchannel in the calculating channel set; Described benchmark physical channel is carried out power control and synchronous, according to the power that carries out the benchmark physical channel after power is controlled and the difference power of described each non-benchmark physical channel and benchmark physics interchannel, each non-benchmark physical channel is carried out power control and synchronous.
12, a kind of device of power control is characterized in that this device comprises: judge module and control module;
Described judge module is used for required type of carrying out the channel of power control is judged, judged result is sent to control module;
Described control module is used for according to received judged result, selects corresponding power control strategy that the required channel that carries out power control is carried out power control and synchronous.
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| CNA2007101216893A CN101388691A (en) | 2007-09-12 | 2007-09-12 | Method and apparatus for power control |
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| CNA2007101216893A CN101388691A (en) | 2007-09-12 | 2007-09-12 | Method and apparatus for power control |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102111861A (en) * | 2009-12-28 | 2011-06-29 | 电信科学技术研究院 | Method and equipment for controlling power of downlink control channel |
| CN102647775A (en) * | 2012-04-26 | 2012-08-22 | 华为技术有限公司 | Inner-loop power control processing method, system and radio network controller |
| CN102026350B (en) * | 2009-09-23 | 2014-08-13 | 中兴通讯股份有限公司 | Method and terminal for power regulation |
| CN104380824A (en) * | 2012-06-15 | 2015-02-25 | 瑞典爱立信有限公司 | Mitigating ghost signalling effects in radio systems |
-
2007
- 2007-09-12 CN CNA2007101216893A patent/CN101388691A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102026350B (en) * | 2009-09-23 | 2014-08-13 | 中兴通讯股份有限公司 | Method and terminal for power regulation |
| CN102111861A (en) * | 2009-12-28 | 2011-06-29 | 电信科学技术研究院 | Method and equipment for controlling power of downlink control channel |
| CN102111861B (en) * | 2009-12-28 | 2014-05-07 | 电信科学技术研究院 | Method and equipment for controlling power of downlink control channel |
| CN102647775A (en) * | 2012-04-26 | 2012-08-22 | 华为技术有限公司 | Inner-loop power control processing method, system and radio network controller |
| WO2013159595A1 (en) * | 2012-04-26 | 2013-10-31 | 华为技术有限公司 | Inner-loop power control processing method and system, and radio network controller |
| CN102647775B (en) * | 2012-04-26 | 2015-03-11 | 华为技术有限公司 | Inner-loop power control processing method, system and radio network controller |
| CN104380824A (en) * | 2012-06-15 | 2015-02-25 | 瑞典爱立信有限公司 | Mitigating ghost signalling effects in radio systems |
| CN104380824B (en) * | 2012-06-15 | 2018-06-29 | 瑞典爱立信有限公司 | Mitigate the phantom signaling effect in wireless system |
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