CN104812043A - Uplink transmission power scaling method for inter-base-station carrier aggregation - Google Patents

Abstract

The invention provides an uplink transmission power scaling method for inter-base-station carrier aggregation. UE, according to characteristics of transmitted data of different service cells, calculates independent power scaling factors for a primary base station and a secondary base station so as to adjust transmission power of each component carrier and enable the UE transmission power scaling strategy to be more flexible; and therefore, on one hand, forward compatibility of the power scaling strategy and the conventional CA is ensured, and on the other hand, with the significance of different data being taken into full consideration, data transmission is guaranteed to the largest degree.

Description

A kind of uplink transmission power Zoom method for carrier aggregation between base station

Technical field

The application relates to wireless communication technology, particularly for the uplink transmission power Zoom method of carrier aggregation between base station.

Background technology

In order to make LTE-Advanced reach descending 1Gbps speed, up 500Mbps speed, makes full use of the frequency range of each dispersion, 3GPP version 10(Rel-10 simultaneously) introduce carrier aggregation technology (Carrier Aggregation, CA).By being polymerized the member carrier (Component Carrier, CC) of maximum 5 20MHz width, making system bandwidth reach 100MHz, thus meeting rate requirement.

As 3GPP version 8(Rel-8), subscriber equipment (UE) needs to do uplink power control at each member carrier, and the power grade (Power Class) based on oneself limits maximum transmission power.To control and maximum power limits because UE carries out independent power at each member carrier, so inevitably can occur that the transmitting power sum of UE at each member carrier is more than the problem of UE maximum transmission power.In order to address this problem, in the carrier aggregation (in base station CA, i.e. intra-eNodeB CA, hereinafter referred to as traditional C A) of 3GPP version 10 and version 11, introduce and employing UE transmitting power convergent-divergent (Power Scaling).

Physical Uplink Control Channel (PUCCH) and coexisting of Physical Uplink Shared Channel (PUSCH) make the processing mode of UE to transmitting power convergent-divergent different to different channels.Control information is the key message ensureing that data correctly receive, meanwhile, different from PUSCH, and PUCCH transmission not mixed self-adapting retransmits (HARQ), so any PUCCH transmission priority is all always higher than the PUSCH transmission of carrying out simultaneously.So first UE arranges the power needed for PUCCH, then dump power is used as PUSCH power setting.Similarly, in PUSCH, carry ascending control information (UCI, comprises transmitting and scheduling request, HARQ ACK/NACK, channel status indicate, etc.) PUSCH transmission priority higher than the PUSCH transmission of not carrying UCI.Based on above-mentioned, when UE arrives maximum transmission power, first reduce the PUSCH power that (Scale down) does not carry UCI, make power sum be no more than maximum transmission power.The value of zoom factor (Scaling factor) is unified to all member carriers, and exception is, when the power of some member carrier drops to below effective value, the transmitting power on these carrier waves is directly set to 0.

3GPP is at version 12(Rel-12) propose small-cell enhancing (Small Cell Enhancement, SCE) demand, the target scene that small-cell strengthens includes the enhancing of scene that macrocell covers and the scene not having macrocell to cover, the scene of indoor and the scene of outdoor, ideal and imperfect backhaul, as shown in Figure 1.

Macro base station is as the dominant base (Master eNodeB) of UE, and small-cell base station is as the prothetic group station (Secondary eNodeB) of UE.Macrocell and small-cell can be operated in different frequency ranges.When there being dominant base subordinate MPS process, can adopt the technology (Inter-eNodeB CA) of carrier aggregation between base station, wherein, dominant base and prothetic group station are independently dispatched and distributing radio resource.Macro base station and small-cell base station can be polymerized more than one member carrier, but main member carrier (Primary CC) can only at macro base station.

For UE, macrocell coverage area is large, has the link of comparatively lasting stability, although and small-cell coverage is little, channel quality is better.Based on the different characteristics of Liang Zhong community, dissimilar data can be transmitted for UE in dominant base and prothetic group station, and such as, dominant base is more suitable for transmitting high-level signaling, and prothetic group station is more suitable for service data transmission; Or dominant base is more suitable for transmission and ensures bit rate traffic (GBR traffic), prothetic group station is more suitable for transmission non-guaranteed bit rate traffic (non-GBR business).

Summary of the invention

A kind of uplink transmission power Zoom method for carrier aggregation between base station of the present application.UE is according to the feature of different service cells transmission data, by calculating independently power-scaling factors to each Serving cell thus the transmitting power of adjustment on each member carrier, make UE transmitting power convergent-divergent strategy more flexible, ensure that the forward compatibility of power scaling strategy and traditional C A on the one hand, also taken into full account the importance of different pieces of information on the other hand, maximum possible ensure that transfer of data.

For achieving the above object, of the present invention as follows:

For a uplink transmission power Zoom method for carrier aggregation between base station, the method comprises:

UE calculates a public zoom factor for each member carrier;

According to each Serving cell transmit the feature of data, calculate the specific zoom factor for dominant base or prothetic group station;

UE comprehensively uses described public zoom factor and described specific zoom factor, calculates final data transmission power.

Further,

Use the UE of carrier aggregation between base station, if when the transmitting power sum of UE on each carrier wave limits more than the maximum transmission power of UE, UE can reportedly be input into row power scaling by logarithm.

Further, the method comprises:

UE uses independently power-scaling factors to dominant base or prothetic group station.

Further, the method comprises:

Described public zoom factor is based on the transmitting power sum of UE needed for each member carrier, and the residue of UE can be distributed power calculation and obtain.Here, the residue of UE can be distributed power and referred to the power that the remaining Physical Uplink Shared Channel (PUSCH) that can be used for not carrying ascending control information (UCI) of UE transmits.

The residue of UE can be distributed power and be comprised any one in following situation:

1) only have the PUSCH data of not carrying UCI, there is no ascending control information.

2) when PUCCH and PUSCH coexists, first UE sets the transmitting power of PUCCH, then dump power is used for the PUSCH transfer of data of not carrying UCI;

3) when the PUSCH carrying UCI and the PUSCH not carrying UCI coexists, first UE sets the PUSCH transmitting power of carrying UCI, then dump power is used for the PUSCH transmission of not carrying UCI;

4) PUCCH, carries the PUSCH of UCI, and when the PUSCH not carrying UCI coexists, first UE sets the transmitting power of PUCCH, and then the PUSCH transmitting power of UCI is carried in setting, then dump power is used for the PUSCH transmission of not carrying UCI.

The computational methods of specific zoom factor comprise:

UE physical layer, according to the equivalent data importance factor at dominant base or prothetic group station, considers the data importance factor of all member carrier data simultaneously, draws specific zoom factor corresponding to dominant base or prothetic group station; Or

UEMAC layer, according to mathematical logic channel priority, generates an equivalent importance factor.And then draw specific zoom factor to dominant base or prothetic group station.

Here, the specific zoom factor of described independent base station, all member carriers under each base station adopt unified specific zoom factor.

Finally, UE uses comprehensive zoom factor to carry out power scaling to the PUSCH data transmission power that each member carrier does not carry UCI.

For a uplink transmission power Zoom method for carrier aggregation between base station, the method process comprises:

UE receives the Grant for resource allocation from base station;

UE calculates a public zoom factor for each member carrier;

According to each Serving cell transmit the feature of data, calculate the specific zoom factor for dominant base or prothetic group station;

UE comprehensively uses described public zoom factor and described specific zoom factor, calculates final data transmission power.

Further,

Use the UE of carrier aggregation between base station, if when the transmitting power sum of UE on each carrier wave limits more than the maximum transmission power of UE, UE can reportedly be input into row power scaling by logarithm.

Further, this device comprises,

UE uses independently power-scaling factors to dominant base or prothetic group station.

Further, this device comprises:

Described public zoom factor is based on the transmitting power sum of UE needed for each member carrier, and the residue of UE can be distributed power calculation and obtain.

The computational methods of specific zoom factor comprise:

UE physical layer, according to the equivalent data importance factor at dominant base or prothetic group station, considers the data importance factor of all member carrier data simultaneously, draws specific zoom factor corresponding to dominant base or prothetic group station; Or

UEMAC layer, according to mathematical logic channel priority, generates an equivalent importance factor.And then draw specific zoom factor to dominant base or prothetic group station.

Here, the specific zoom factor of described independent base station, all member carriers under each base station adopt unified specific zoom factor.

Finally, UE uses comprehensive zoom factor to carry out power scaling to the PUSCH data transmission power that each member carrier does not carry UCI.

By the method for the present patent application, can power scaling strategy in forward compatibility traditional C A, taking into full account the traffic performance of different members carrier transmission, while carrying out power scaling more neatly, at utmost ensure that business is transmitted.

Accompanying drawing explanation

Fig. 1 is the deployment scenario that small-cell strengthens;

Fig. 2 is the inventive method schematic flow sheet;

Fig. 3 is the inventive method power-scaling factors computational process schematic diagram;

Fig. 4 is that the inventive method uses standard QCI characteristic.

Embodiment

Basic thought of the present invention is: apply for a kind of uplink transmission power Zoom method for carrier aggregation between base station and device.Between base station in carrier aggregation scene, because on each Serving cell of UE to transmit the importance of data different, so need the power-scaling factors different to the employing at dominant base or prothetic group station, power scaling can be carried out more neatly, also can ensure the compatibility of power scaling in being polymerized with convention carrier, can ensure that business is transmitted further simultaneously.

For making the object of the application, technical scheme and advantage clearly understand, to develop simultaneously embodiment referring to accompanying drawing, the method and apparatus of the application is described in further detail.

As shown in Figure 2, a kind of uplink transmission power Zoom method for carrier aggregation between base station, the method specifically comprises:

Step 201, UE receives the Grant for resource allocation from base station.

Here, Grant for resource allocation mainly indicates UE to carry out Wireless Data Transmission on concrete Radio Resource.UE therefrom can learn that transfer of data needs position and the resource size of the Radio Resource taken, and the data type that can transmit and type of service.The type of data may comprise following one or more:

1) Physical Uplink Control Channel data (PUCCH);

2) the Physical Uplink Shared Channel data (PUSCH with UCI) of ascending control information are carried;

3) the Physical Uplink Shared Channel data (PUSCH without UCI) of ascending control information are not carried.

Step 202, UE, according to data importance, calculates the comprehensive power zoom factor being used for each base station

w _C＝α _public*α _spec,C，

Wherein, α _publicbe the public zoom factor of all member carriers of user, can power calculation be distributed by the residue of the transmitting power sum of UE needed for each member carrier and UE and be obtained; α _{spec, C}be the specific zoom factor for base station C, determined in data importance that each Serving cell passes by UE.

Here, data importance is the further classification to above-mentioned PUSCH without UCI data, specifically comprises: high-level signaling data; Higher priority business datum, such as GBR traffic; Lower-priority traffic data, such as non-GBR business, etc.

For the transmitting power of UE after guaranteed output convergent-divergent is no more than maximum power restriction, w _cthe following restrictive condition of demand fulfillment:

$\left\{\begin{array}{c}{w}_C\≤1\\ \underset{i\∈\mathrm{noUCI}}{\mathrm{\Σ}}{w}_C\·{\tilde{P}}_{\mathrm{PUSCH},i}\≤P_{\mathrm{PowerClass}}-\mathrm{\Σ}{P}_{\mathrm{PUCCH}}-\underset{j\∈\mathrm{UCI}}{\mathrm{\Σ}}{P}_{\mathrm{PUSCH},j}\end{array}\right.$

Here, P _powerClassrepresent the maximum power restriction carried out based on UE ability rating.P _pUCCHrepresent the transmitting power of PUCCH, between base station in carrier aggregation, UE may send PUCCH on multiple member carrier, therefore use and number, if UE does not have PUCCH to send, then P _pUCCH=0. represent the PUSCH transmitting power sum of carrying UCI, if UE does not send the PUSCH carrying UCI, then this is 0. it is the transmitting power that member carrier i calculates before power scaling adjustment.

If there is $\underset{i\∈\mathrm{noUCI}}{\mathrm{\Σ}}{w}_C\·{\tilde{P}}_{\mathrm{PUSCH},i}>P_{\mathrm{PowerClass}}-\mathrm{\Σ}{P}_{\mathrm{PUCCH}}-\underset{j\∈\mathrm{UCI}}{\mathrm{\Σ}}{P}_{\mathrm{PUSCH},j}$ Situation, then need w _ccarry out finely tuning and iterative computation, till meeting above-mentioned restrictive condition.

Step 203, UE uses comprehensive power zoom factor w _cconvergent-divergent is carried out to the PUSCH transmitting power of not carrying UCI of each member carrier on the C of base station.

$P_{\mathrm{PUSCH},i}=w_C*{\tilde{P}}_{\mathrm{PUSCH},i}$

Here, it is the transmitting power that member carrier i calculates before power scaling adjustment.

Further, as Fig. 3, in step 202, UE rated output zoom factor is divided into following two steps to carry out:

Step 301, UE calculates public zoom factor α _public.

${\mathrm{\α}}_{\mathrm{public}}=\frac{P_{\mathrm{PowerClass}}-\mathrm{\Σ}{P}_{\mathrm{PUCCH}}-\underset{j\∈\mathrm{UCI}}{\mathrm{\Σ}}{P}_{\mathrm{PUSCH},j}}{\underset{i\∈\mathrm{noUCI}}{\mathrm{\Σ}}{P}_{\mathrm{PUSCH},i}},$

Wherein, P _powerClassrepresent the maximum power restriction carried out based on UE ability rating.P _pUCCHrepresent the transmitting power of PUCCH, if UE does not have PUCCH to send, then P _pUCCH=0. represent the PUSCH transmitting power sum of carrying UCI, if UE does not send the PUSCH carrying UCI, then this is 0.In like manner represent that the PUSCH carrying UCI is required and send sum.Thus, the implication of above formula can be regarded as, and the real surplus of UE can distribute power and the ratio of PUSCH power demand carrying UCI.

Step 302, UE calculates specific zoom factor α _{spec, C}.Specificity factor can be calculated by two kinds of methods and generate, and specifically comprises:

1) UE physical layer calculates: macrocell and small-cell have different features, therefore UE data transmission scheme according to a preconcerted arrangement, cell ID (Cell ID) and the mapping table transmitting the data importance factor is safeguarded by its physical layer, such as, high-level signaling is 3, GBR data are 2, non-GBR data is 1, etc.UE can calculate the equivalent data importance factor under each base station according to mapping table, consider the data importance factor of all member carrier data simultaneously, draw the specific zoom factor corresponding to each base station.

Such as: macrocell passes high-level signaling and GBR traffic data, small-cell passes non-GBR business datum, so the average importance factor of dominant base is (3+2)/2=2.5, the average importance factor at prothetic group station is 1, by normalization or equivalent process, the specific zoom factor that can obtain dominant base is 2.5/ (2.5+1) ≈ 0.7, and the specific zoom factor at prothetic group station is 1/ (2.5+1) ≈ 0.3.

2) UE MAC layer calculates: MAC layer, according to mathematical logic channel priority, after logic channel multiplexing generations MAC PDU, calculates an equivalent importance factor, this importance therefore can by each priority of logical channels on average or Equivalent Calculation draw.UE can generate different MAC PDU to different districts, and therefore MAC layer can calculate the equivalent importance factor to different base station.UE physical layer can obtain this factor according to interlayer operation, and then draws the specific zoom factor to dominant base or prothetic group station by normalization or equivalent operation.

Such as: macrocell transmission logic channel priority is 1, the data of 2, it is 3 that small-cell passes priority of logical channels, the data of 4,5, then the average importance factor of dominant base is 2/ (1+2) ≈ 0.7, average importance 3/ (3+4+5)=0.25 at prothetic group station, by normalization or equivalent process, the specific zoom factor of dominant base is 0.7/ (0.7+0.25) ≈ 0.7, and the specific zoom factor at prothetic group station is 0.25/ (0.7+0.25) ≈ 0.3.

Step 303, UE calculates comprehensive zoom factor wC.Comprehensive zoom factor can be calculated by public zoom factor and specific zoom factor and obtain, such as:

w _C＝α _public*α _spec,C

The foregoing is only the preferred embodiment of the application, not in order to limit the application, within all spirit in the application and principle, any amendment made, equivalent replacements, improvement etc., all should be included within scope that the application protects.

Claims (15)

1., for a uplink transmission power Zoom method for carrier aggregation between base station, it is characterized in that, the method comprises:

UE calculates a public zoom factor for each member carrier;

According to each Serving cell transmit the feature of data, calculate the specific zoom factor for dominant base or prothetic group station;

UE comprehensively uses described public zoom factor and described specific zoom factor, calculates final data transmission power.

2. method according to claim 1, is characterized in that:

Use the UE of carrier aggregation between base station, if when the transmitting power sum of UE on each carrier wave limits more than the maximum transmission power of UE, UE can reportedly be input into row power scaling by logarithm.

3. method according to claim 1 and 2, is characterized in that, the method comprises further:

UE uses independently power-scaling factors to dominant base or prothetic group station.

4. method according to claim 1, is characterized in that:

Described public zoom factor is based on the transmitting power sum of UE needed for each member carrier, and the residue of UE can be distributed power calculation and obtain.Here, the residue of UE can be distributed power and referred to the power that the remaining Physical Uplink Shared Channel (PUSCH) that can be used for not carrying ascending control information (UCI) of UE transmits.

5. method according to claim 4, is characterized in that: the residue of UE can be distributed power and be comprised any one in following situation:

1) only have the PUSCH data of not carrying UCI, there is no ascending control information.

2) when PUCCH and PUSCH coexists, first UE sets the transmitting power of PUCCH, then dump power is used for the PUSCH transfer of data of not carrying UCI;

3) when the PUSCH carrying UCI and the PUSCH not carrying UCI coexists, first UE sets the PUSCH transmitting power of carrying UCI, then dump power is used for the PUSCH transmission of not carrying UCI;

4) PUCCH, carries the PUSCH of UCI, and when the PUSCH not carrying UCI coexists, first UE sets the transmitting power of PUCCH, and then the PUSCH transmitting power of UCI is carried in setting, then dump power is used for the PUSCH transmission of not carrying UCI.

6. method according to claim 1, is characterized in that, the computational methods of specific zoom factor comprise:

UE physical layer, according to the equivalent data importance factor at dominant base or prothetic group station, considers the data importance factor of all member carrier data simultaneously, draws specific zoom factor corresponding to dominant base or prothetic group station; Or,

UE MAC layer, according to mathematical logic channel priority, generates an equivalent importance factor.And then draw specific zoom factor to dominant base or prothetic group station.

7. method according to any one of claim 1 to 6, is characterized in that, the specific zoom factor of described independent base station, and all member carriers under each base station adopt unified specific zoom factor.

8. method according to any one of claim 1 to 7, it is characterized in that, the method comprises further:

UE uses comprehensive zoom factor to carry out power scaling to the PUSCH data transmission power that each member carrier does not carry UCI.

9., for a uplink transmission power Zoom method for carrier aggregation between base station, it is characterized in that, comprise step:

Receive the Grant for resource allocation from dominant base or prothetic group station;

Calculate a public zoom factor for each member carrier;

According to each Serving cell transmit the feature of data, calculate the specific zoom factor for dominant base or prothetic group station;

The described public zoom factor of comprehensive use and described specific zoom factor, calculate final data transmission power.

10. method according to claim 9, is characterized in that:

Use the UE of carrier aggregation between base station, if when the transmitting power sum of UE on each carrier wave limits more than the maximum transmission power of UE, UE can reportedly be input into row power scaling by logarithm.

11. methods according to claim 9 or 10, it is characterized in that, this device comprises further:

UE uses independently power-scaling factors to dominant base or prothetic group station.

12. methods according to claim 9, is characterized in that:

Described public zoom factor is based on the transmitting power sum of UE needed for each member carrier, and the residue of UE can be distributed power calculation and obtain.

13. methods according to claim 9, is characterized in that, the calculating of specific zoom factor comprises:

UE physical layer, according to the equivalent data importance factor at dominant base or prothetic group station, considers the data importance factor of all member carrier data simultaneously, draws specific zoom factor corresponding to dominant base or prothetic group station; Or,

UE MAC layer, according to mathematical logic channel priority, generates an equivalent importance factor.And then draw specific zoom factor to dominant base or prothetic group station.

14. according to any one of claim 9 to 13 method, it is characterized in that, the specific zoom factor of described independent base station, all member carriers under each base station adopt unified specific zoom factor.

15. according to any one of claim 9 to 14 method, it is characterized in that, this device comprises further:

UE uses comprehensive zoom factor to carry out power scaling to the PUSCH data transmission power that each member carrier does not carry UCI.