CN103781111A - Method for reporting power headroom - Google Patents
Method for reporting power headroom Download PDFInfo
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- CN103781111A CN103781111A CN201210405658.1A CN201210405658A CN103781111A CN 103781111 A CN103781111 A CN 103781111A CN 201210405658 A CN201210405658 A CN 201210405658A CN 103781111 A CN103781111 A CN 103781111A
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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
- H04W52/04—TPC
- H04W52/38—TPC being performed in particular situations
- H04W52/383—TPC being performed in particular situations power control in peer-to-peer links
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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
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
- H04W52/365—Power headroom reporting
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Abstract
The invention discloses a method for reporting power headroom. The method comprises steps: an eNB configures D2D PHR parameters for a UE via RRC signaling, and the D2D PHR parameters comprise a periodic D2D PHR timer, a prohibit D2D PHR timer and a D2D link path loss change door limit; when triggering conditions are met, the UE triggers the D2D PHR, and the triggering conditions comprise a first triggering condition; overtime happens to the periodic D2D PHR timer; and information of configuring the D2D PHR parameters is received. The first triggering conditions comprise that the UE has cellular uplink resources for transmitting new data, overtime happens to the prohibit D2D PHR timer, and when the D2D PHR is transmitted last time, the path loss change value of the D2D link is larger than the D2D link path loss change door limit. When the embodiment of the invention is applied, the power headroom information on the D2D link can be known by the eNB, and resource scheduling and power control can be carried out on the D2D link.
Description
Technical field
The application relates to communication technical field, more specifically, relates to a kind of method of reporting power margin.
Background technology
In existing LTE system, the transfer of data between two UE is all to realize by the relaying of network side, and transmitting terminal user (UE) is first sent to network side by communication data, afterwards network side again by this data retransmission to receiving terminal UE.Even if two very near UE of distance want to communicate, these communication datas also will just can be issued the other side through the transmission of network side so.Equipment is exactly the application scenarios for transmitting terminal UE and receiving terminal UE close together to the introducing of equipment (D2D) technology, now between two UE, can directly transmit communication data, and no longer need network side to carry out relaying.
Introduce the load that D2D technology can reduce network side, in addition due to two UE close together, can effectively reduce the transmitting power of UE, thereby realize energy-conservation.In order to be different from this D2D transmission technology, be cellular transmission hereinafter referred to as original transmission means.
Controlled in order to guarantee network, can the central controlled D2D transmission of Adoption Network side.Network side has the ability to control whole D2D transmitting procedure, by network side by foundation, maintenance and the release of control signal control D2D communication link, and business datum is directly transmitted between two UE.
By network side, central controlled D2D transmits as shown in Figure 1.In this network, eNB need to be that UE distributes the resource of two types: the cell resource of control channel between eNB and UE, and the D2D resource of service data transmission between two UE.
In existing LTE system, UE need to report to eNB the power headroom reporting (PHR) (PHR) of oneself, and PHR carries out scheduling of resource and power control for eNB to UE.PHR is the difference between UE nominal maximum transmission power and current Uplink Shared Channel (UL-SCH) through-put power estimated value.
ENB is UE configuration PHR relevant parameter by " phr-Config " cell in " MAC-MainConfig " cell in RRC signaling, for controlling the triggering of PHR, these parameters comprise: periodicPHR-Timer, prohibitPHR-Timer, dl-PathlossChange.
The trigger condition of PHR comprises following three kinds, when meeting arbitrary condition in following three kinds of conditions, triggers PHR.
1, UE has the ascending resource of transmission new data, and prohibitPHR-Timer is overtime and after transmitting PHR last time, the changing value of path loss is greater than dl-PathlossChange;
2, periodicPHR-Timer is overtime;
3, receiving when forbidding the configuration of this function or reshuffle PHR parameter from high level non-.
PHR reports by MAC Control Element (MAC CE).If UE has triggered PHR and met the report condition of PHR, UE produces a PHR MAC CE and is reported eNB.
In LTE single-carrier system, as shown in Figure 2, wherein " R " is reserved bit to the form of PHR MAC CE, and " PH " takies 6 bits.
In LTE system, the corresponding MAC head of each MAC CE, uses different Logic Channel Identifier (LCID) to represent different MAC CE types therein.LCID in MAC corresponding to PHR MAC CE head is " 11010 ".MAC form corresponding to MAC CE as shown in Figure 3.
After introducing the central controlled D2D of eNB transmission in LTE system, in system, there is the D2D link of service data transmission between the cellular link of control channel between the link of two types: eNB and UE and two UE.UE need to carry out PHR for these two kinds of links and report, and eNB carries out resource distribution and power control to these two kinds of links.The PHR of cellular link reports and can continue to use prior art, and the PHR that still how to realize D2D link reports or an open question.
Summary of the invention
The embodiment of the present invention proposes a kind of method of reporting power margin, can make eNB understand the power margin information on D2D link, thereby D2D link is carried out to scheduling of resource and power control.
The technical scheme of the embodiment of the present invention is as follows:
A method for reporting power margin, described method comprises:
Base station eNB for user UE by radio resource control signaling RRC signal deployment equipment to devices communicating link power headroom reporting D2D PHR parameter, D2D PHR parameter comprises cycle D2D PHR timer, forbid that D2DPHR timer and D2D link path loss change thresholding;
In the time meeting arbitrary trigger condition, UE triggers D2D PHR, and described trigger condition comprises the first trigger condition, cycle D2D PHR timer expiry or receives the message of configuration D2D PHR;
Described the first trigger condition comprises: UE have transmission new data honeycomb ascending resource, forbid D2D PHR timer expiry and transmitting D2D PHR last time after the path loss variation value of D2D link be greater than D2D link path loss variation thresholding;
UE reports D2D PHR to eNB.
ENB is opposite end UE configuration reference signal, and UE obtains the path loss variation value of described D2D link by monitoring described reference signal.
Described UE reports D2D PHR to comprise to eNB: UE reports D2D PHR by RRC signaling.
Described UE reports D2D PHR to comprise to eNB: UE reports D2DPHR by MAC Control Element MAC CE.
Described UE reports D2D PHR to comprise by MAC CE: report D2DPHR by D2D PHR MAC CE, and divide D2D PHR MAC CE and cellular link PHR MACCE by MAC Head Section corresponding to MAC CE.
Described UE reports D2D PHR to comprise by MAC CE: report D2DPHR by D2D PHR MAC CE, and distinguish D2D PHR MAC CE and cellular link PHR MAC CE by different MAC CE forms.
Described UE reports D2D PHR to comprise by MAC CE: report D2DPHR by integrated PHR MAC CE;
D2D PHR and honeycomb PHR are distinguished in position, the position of honeycomb PHR in integrated PHR MAC CE by D2D PHR in integrated PHR MAC CE.
While utilizing multi-carrier transmission data, described UE reports D2D PHR to comprise by MAC CE:
Report D2D PHR by PHR MAC CE;
Distinguish different carrier waves by carrier wave mark;
The PHR of corresponding this carrier wave of each carrier wave being labeled;
The PHR corresponding to carrier wave of D2D link is D2D PHR;
The PHR corresponding to carrier wave of cellular link is honeycomb PHR.
From technique scheme, can find out, eNB is that UE passes through RRC signal deployment D2D PHR parameter in embodiments of the present invention, and D2D PHR parameter comprises cycle D2D PHR timer, forbids that D2D PHR timer and D2D link path loss change thresholding.In the time meeting trigger condition, UE triggers D2D PHR, and described trigger condition comprises the first trigger condition; Cycle D2D PHR timer expiry; Receive the message of configuration D2D PHR.Described the first trigger condition comprises: UE have transmission new data honeycomb ascending resource, forbid D2D PHR timer expiry and transmitting D2D PHR last time after the path loss variation value of D2D link be greater than D2D link path loss variation thresholding.UE reports D2D PHR to eNB.Report the power margin information on D2D link by UE to eNB, can make eNB, based on this information, D2D link be carried out to scheduling of resource and power control.
Accompanying drawing explanation
Fig. 1 is the central controlled D2D transmission of network side schematic diagram;
Fig. 2 is existing PHR MAC CE form schematic diagram;
Fig. 3 is the MAC prefix form schematic diagram that MAC CE is corresponding;
Fig. 4 is the method flow schematic diagram of reporting power margin;
Fig. 5 is integrated PHR MAC CE structural representation.
Embodiment
For making the object, technical solutions and advantages of the present invention express clearlyer, below in conjunction with drawings and the specific embodiments, the present invention is further described in more detail.
In embodiments of the present invention, eNB is UE configuration D2D PHR parameter, and in the time meeting trigger condition, UE triggers D2D PHR, and UE reports D2D PHR to eNB.Report the power margin information on D2D link by UE to eNB, can make eNB, based on this information, D2D link be carried out to scheduling of resource and power control.
Are method flow schematic diagrames of reporting power margin referring to accompanying drawing 4, specifically comprise the following steps:
Step 401, eNB are that UE passes through RRC signal deployment D2D PHR parameter.
D2D PHR is the difference between the transmitting power on nominal maximum transmission power and the D2D transfer resource of UE on D2D link.
ENB is the maximum transmission power on a D2D link of UE configuration by broadcast or special RRC signaling, and UE is according to this maximum transmission power and some other because usually determining own nominal maximum transmission power on D2D link afterwards.
In existing LTE system, while only having UE to there is uplink authorization resource, just can report PHR, and PHR reflection is the difference between the transmitting power estimated value of UE nominal maximum transmission power and current subframe.For D2D network, because honeycomb ascending resource and the D2D transmission resource of UE may be in same subframes, therefore can not limited by this, now D2D PHR reflection be the nominal maximum transmission power of UE on D2D link with send the honeycomb ascending resource place subframe of D2D PHR before or difference between transmitting power in D2D transmission resource afterwards.
ENB is UE configuration D2D PHR parameter, for controlling the triggering of D2D PHR of UE.D2D PHR parameter need to be different from the PHR parameter of cellular link.D2D PHR parameter comprises: cycle D2D PHR timer (D2DperiodicPHR-Timer), forbid that D2D PHR timer (D2DprohibitPHR-Timer) and D2D link path loss change thresholding (D2D-PathlossChange) etc.
D2D PHR parameter is by RRC signal deployment, this need to expand existing RRC signaling, such as increasing " D2Dphr-Cong " cell in " MAC-MainCong " cell in existing RRC signaling, or increase new " D2DMAC-MainConfig " cell.
Step 402, in the time meeting trigger condition, UE triggers D2D PHR.
The triggering of D2D PHR adopts Event triggered mode, and take eNB as UE configuration parameter D2DperiodicPHR-Timer, D2DprohibitPHR-Timer and D2D-PathlossChange are example, and D2D PHR can trigger by following any one event:
1, the first trigger condition
The first trigger condition comprises: UE is useful on the honeycomb ascending resource of transmission new data, and D2DprohibitPHR-Timer is overtime, and the changing value of the path loss of D2D link is greater than D2D link path loss variation thresholding after transmitting D2D PHR last time.
ENB need to be the transmitting power of opposite end UE configuration reference signal (can be existing detection reference signal (SRS), demodulated reference signal (DMRS) or the new D2D link reference signal (D2D-RS) of introducing), then this information is notified to UE, UE obtains the path loss variation value of D2D link by monitoring the reference signal of opposite end UE transmission afterwards.
2, D2DperiodicPHR-Timer is overtime.
3, in the message receiving from high-rise configuration D2D PHR parameter.
Step 403, UE report D2D PHR to eNB
UE reports D2D PHR to eNB, and a kind of scheme is to report by RRC signaling, and this need to expand existing RRC signaling, or defines new RRC signaling.
Another kind of scheme is to report by the form of MAC CE.Now, the PHR MAC CE of D2D PHR MAC CE and cellular link need to be distinguished, following several differentiating method can be adopted.
(1) distinguish by MAC head
The form of D2D PHR MAC CE is reused the form of existing honeycomb PHR MAC CE, distinguishes between the two by different MAC heads.
In existing LTE system, dissimilar MAC CE correspondence has the MAC head of Different L CID value.Can define new MAC head and distribute new LCID for it for D2D PHR MAC CE.In existing LTE system, the LCID scope of " 01011 " to " 11000 " is reserved, and can therefrom select a LCID for identifying D2DPHR MAC CE, if LCID is " 11000 ".
(2) distinguish by MAC CE form
D2D PHR MAC CE uses identical MAC head with existing honeycomb PHR MAC CE, distinguishes between the two by different MAC CE forms.
The form of existing honeycomb PHR MAC CE as shown in Figure 2, wherein comprises two reserved bit.Can expand one of them reserved bit for distinguishing honeycomb PHR MAC CE and D2D PHR MAC CE, as " 0 " represents honeycomb PHR MAC CE, and " 1 " represents D2D PHR MAC CE.
(3) integrated PHR MAC CE
Referring to accompanying drawing 5, integrated PHR MAC CE comprises D2D PHR and honeycomb PHR simultaneously, and the PHR of these two kinds of links is reported together eNB by UE.Now, can distinguish the position in integrated PHR MAC CE by these two kinds of PHR, such as first byte is honeycomb PHR, and second byte is D2D PHR.
Need to be an integrated new MAC head of PHR MAC CE definition, new MAC reusable existing MAC form, need to distribute a new LCID for it.
It should be noted that, technical scheme of the present invention is applicable to the scene of D2D link employing multi-carrier transmission.Now, UE need to report the PHR of multiple communities on D2D link.
Existing LTE network has been supported multi-carrier transmission, and following introducing after D2D technology, probably adopts the resource distribution mode based on carrier wave, distributes some carrier waves for cellular communication, and distributes other carrier wave for D2D communication.
First, distinguish different carrier waves by carrier wave mark.Then, UE can be integrated in the PHR of all carrier waves in a PHR MAC CE and report, and its corresponding carrier wave is distinguished in the position by PHR in PHR MAC CE, and what the most forward PHR in for example position was corresponding is first carrier wave.After eNB receives this PHR, if find that corresponding carrier wave distributes to cellular link, think that the PHR of this carrier wave is honeycomb PHR, if find that corresponding carrier wave distributes to D2D link, think that the PHR of this carrier wave is D2D PHR.
The above, be only preferred embodiment of the present invention, is not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (8)
1. a method for reporting power margin, is characterized in that, described method comprises:
Base station eNB for user UE by radio resource control signaling RRC signal deployment equipment to devices communicating link power headroom reporting D2D PHR parameter, D2D PHR parameter comprises cycle D2D PHR timer, forbid that D2DPHR timer and D2D link path loss change thresholding;
In the time meeting arbitrary trigger condition, UE triggers D2D PHR, and described trigger condition comprises the first trigger condition, cycle D2D PHR timer expiry or receives the message of configuration D2D PHR;
Described the first trigger condition comprises: UE have transmission new data honeycomb ascending resource, forbid D2D PHR timer expiry and transmitting D2D PHR last time after the path loss variation value of D2D link be greater than D2D link path loss variation thresholding;
UE reports D2D PHR to eNB.
2. the method for reporting power margin according to claim 1, is characterized in that, eNB is opposite end UE configuration reference signal, and UE obtains the path loss variation value of described D2D link by monitoring described reference signal.
3. the method for reporting power margin according to claim 1, is characterized in that, described UE reports D2D PHR to comprise to eNB: UE reports D2D PHR by RRC signaling.
4. the method for reporting power margin according to claim 1, is characterized in that, described UE reports D2D PHR to comprise to eNB: UE reports D2D PHR by MAC Control Element MAC CE.
5. the method for reporting power margin according to claim 4, it is characterized in that, described UE reports D2D PHR to comprise by MAC CE: report D2D PHR by D2D PHR MAC CE, and divide D2D PHR MAC CE and cellular link PHR MAC CE by MAC Head Section corresponding to MAC CE.
6. the method for reporting power margin according to claim 4, it is characterized in that, described UE reports D2D PHR to comprise by MAC CE: report D2D PHR by D2D PHR MAC CE, and distinguish D2D PHR MAC CE and cellular link PHR MAC CE by different MAC CE forms.
7. the method for reporting power margin according to claim 4, is characterized in that, described UE reports D2D PHR to comprise by MAC CE: report D2D PHR by integrated PHR MAC CE;
D2D PHR and honeycomb PHR are distinguished in position, the position of honeycomb PHR in integrated PHR MAC CE by D2D PHR in integrated PHR MAC CE.
8. the method for reporting power margin according to claim 4, is characterized in that, while utilizing multi-carrier transmission data, described UE reports D2D PHR to comprise by MAC CE:
Report D2D PHR by PHR MAC CE;
Distinguish different carrier waves by carrier wave mark;
The PHR of corresponding this carrier wave of each carrier wave being labeled;
The PHR corresponding to carrier wave of D2D link is D2D PHR;
The PHR corresponding to carrier wave of cellular link is honeycomb PHR.
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| CN201210405658.1A CN103781111A (en) | 2012-10-23 | 2012-10-23 | Method for reporting power headroom |
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| CN201210405658.1A CN103781111A (en) | 2012-10-23 | 2012-10-23 | Method for reporting power headroom |
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| WO2015117517A1 (en) * | 2014-08-20 | 2015-08-13 | 中兴通讯股份有限公司 | Overload control method and device for d2d communication device discovery |
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| CN111148207A (en) * | 2018-11-02 | 2020-05-12 | 华为技术有限公司 | Reporting method, obtaining method and device of power headroom report |
| WO2020088679A1 (en) * | 2018-11-02 | 2020-05-07 | 华为技术有限公司 | Reporting method for power headroom report, acquisition method, and device |
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