CN102281621A - Method, base station and user terminal for implementing transmission power control in wireless network - Google Patents

Abstract

The invention discloses a method, a base station and a user terminal for implementing transmission power control in a wireless network. The method for implementing transmission power control in the wireless network comprises the following steps of: allocating a plurality of identifiers to the user terminal (400) to identify the user terminal (400), wherein at least two of the identifiers correspond to different transmission power control (TPC) commands respectively; after a receiving end receives a data transmission channel, determining the TPC command to be executed according to the quality of the received data transmission channel; identifying the user terminal (400) by using the identifier corresponding to the TPC command in a physical control channel, and sending the identifier to a sending end of the data transmission channel; receiving the physical control channel from the sending end the data transmission channel, and extracting the identifiers of the user terminal (400) from the received physical control channel; and implementing power control on the data transmission channel according to the TPC commands corresponding to the identifiers. According to the invention, the error rate of the transmitted TPC commands is greatly reduced, and the flexibility and adaptability of the transmission power control method are greatly improved.

Description

In wireless network, implement method, base station and the user terminal of transmitting power control

Technical field

The present invention relates to a kind of method of transmitting power control and the base station and user terminal of described wireless network in wireless network, implemented.

Background technology

In mobile communication system according to 3G (the 3rd third-generation mobile communication technology) standard, for example TD SDMA inserts (TD-SCDMA) system and Wideband Code Division Multiple Access (WCDMA) inserts in (WCDMA) system, inner loop power control is finished by transmitting power control (TPC) order that user terminal (UE) or base station (that is B node) send.According to above-mentioned 3G standard, the TPC order only is the symbol of one 2 bit, when the TPC order is " 00 ", and the order of this TPC order representative " reduction power ", and when it equals " 11 ", the order of this TPC order representative " increase power ".The equipment that receives described TPC order should be ordered according to this TPC and be increased or reduce its transmitting power, thereby realizes the purpose of transmitting power control.

In high-speed packet access evolution (HSPA+) system according to 3G standard, strengthening dedicated channel (E-DCH) is a uplink channel, is used for improving power system capacity and data throughout and reduces the delay of dedicated channel in up link.Because E-DCH is a up channel, it sends to the B node by user terminal.The transmitting power that is used for this enhancing dedicated channel (E-DCH) is controlled to be up-link transmission power control, so corresponding TPC order is to send to user terminal by the B node.More specifically, the B node sends to user terminal by the interior ring TPC order that E-DCH absolute grant channel (E-AGCH) will be used for E-DCH, user terminal is ordered according to the TPC that receives and is adjusted its uplink transmit reference power then, i.e. the expectation of benchmark on E-DCH transmitting power.

The concrete burst structure of E-AGCH figure 1 illustrates.As shown in Figure 1; an E-AGCH pulse train comprises 864 chips; these chips are divided into 6 fields; first field is the data symbol field; be used to carry data message; second field is the Midamble field; carry and be used for channel estimating; the information of functions such as adjustment synchronously, its length is fixed as 144 chips, and the 3rd field is simultaneous bias (SS) field; the 4th field is the TPC field; be used to carry above-mentioned TPC order, the 5th field is the data symbol field, is used to carry data message; last field is protection interval (GP) field, is used to provide the interval of the protection between the adjacent pulse string.

But above-mentioned TPC scheme has two problems: error rate is high and flexibility is low.

At first, compare with the E-AGCH piece, it is high a lot of that the error rate of TPC in transmission course wanted.This is because TPC only is a symbol behind the spread spectrum, without any coding gain, and the E-AGCH piece be because will take chnnel coding for this symbol, thereby has high coding gain, whether the E-AGCH piece has CRC check simultaneously, can judge data block and transmit correctly.In general, the Block Error Rate of E-AGCH piece (BLER) is probably in 1% level, or even 0.1% level, and the error rate of TPC probably can have 10%.

For the two there being one get more information about, the curve chart of Fig. 2 has provided a contrast between the error rate of the Block Error Rate (BLER) of E-AGCH piece and TPC order.In the curve chart of Fig. 2, abscissa is the signal interference ratio (ior/ioc) on the receiving terminal institute receive channel, and unit is dB, and wherein ior and ioc are respectively the signal that receives and the energy of interference.The ordinate of curve chart shown in Figure 2 is corresponding target bit error, comprises the Block Error Rate of E-AGCH piece, the error rate and the bit error rate in the channel (BER) of TPC command field, and these three indexs are represented with 3 curves respectively in Fig. 2.Can find out significantly from figure, when transmitting power was very little, the error rate of the Block Error Rate of E-AGCH piece and TPC command field all was higher than the bit error rate in the channel, and this is because E-AGCH piece and TPC order all comprise a plurality of bits.As for the contrast between the error rate of the Block Error Rate of E-AGCH piece and TPC command field, when signal interference ratio is low, channel bit error rate is very high, and the E-AGCH piece comprises the bit more much more than TPC command field, the coding gain of E-AGCH piece is not enough to remedy the higher Block Error Rate that more bits cause, so the Block Error Rate of E-AGCH piece is higher than the error rate of TPC command field.When signal interference ratio begin to be increased to probably-thereby the 12dB channel bit error rate descends slightly, for example drops to 10 ^-0.8The time, the Block Error Rate of E-AGCH piece sharply descends, and drops under the error rate of TPC command field, even is reduced under the bit error rate of channel.After this, along with the further increase of signal interference ratio and the further reduction of bit error rate, the Block Error Rate of E-AGCH piece also descends at faster speed, thereby poor more far away more with the error rate of TPC.

The above results means that inner loop power control can not be very accurate, because the TPC that user terminal receives order needs not be equal to the TPC order that the B node is sent.This problem may not be an especially severe in 3G mobile communications network R4 version standard, because TPC order is not relevant with any other judgement or algorithm in the B node.But in HSPA+, this may have a strong impact on High Speed Uplink Packet and insert (HSUPA) service, orders and realizes because the neighbor cell interference control algolithm among the HSUPA also depends on described TPC.In the HSUPA system, stored a closed loop amount P in the user terminal _E-base, P _E-baseDefinition in 3G communication standard 3GPP 25.224.When receiving the TPC order at every turn, closed loop amount P _E-baseQuilt is increased progressively according to following formula or is successively decreased:

$P_{e-\mathrm{base}}={\mathrm{PRX}}_{\mathrm{des}\_\mathrm{base}}+\mathrm{step}*\underset{i}{\mathrm{\Σ}}{\mathrm{TPC}}_i={\mathrm{PRX}}_{\mathrm{des}\_\mathrm{base}}+P_{\mathrm{TPC}}---\left(1\right)$

Wherein, PRX _Des-baseRepresent E-PUCH benchmark expectation received power, on behalf of TPC order power, step adjust step-length, TPC _iIndication is to increase power or reduction power, for " increase power " order, TPC _iEqual 1, for " reduction power " order, TPC _iEqual-1, and P _TPCRepresent power adjustment.Also kept a P in the B node _E-base, the B node is thought the P of its storage _E-baseWith user terminal storage should be consistent.If but TPC is not correctly received, the P that stores in user terminal and the B node so _E-baseJust can not be consistent.This may cause the neighbor cell interference control algolithm meaningless, or even controls to wrong direction, will do a detailed explanation to this problem below.

In user terminal, its transmitting power Txpwr is that promptly power resource relevant information (PRRI) is definite by absolute permission power indication, and PRRI sends to the transmitting power that user terminal is used to refer to user terminal by the B node by E-AGCH, wherein

Txpwr＝PRRI·P _{e_base_ue}·L

Wherein, P _{E_base_ue}Expression UE side P _E-base, L represents path loss.

In addition, user terminal can be to B node transmitted power surplus (UPH), and UPH is used for characterizing the high transmit power that user terminal can have, and draws by following formula:

$\mathrm{UPH}=\frac{P_{\max }}{P_{e\_\mathrm{base}\_\mathrm{ue}}\·L}$

Mention above, the transmitting power of user terminal is determined by power resource relevant information (PRRI), and PRRI obtains according to following formula in the B node:

$\mathrm{PRRI}=\min (\frac{P_c}{P_{e\_\mathrm{base}\_\mathrm{NodeB}}},\frac{P_{\mathrm{RoT}}}{P_{e\_\mathrm{base}\_\mathrm{NodeB}}},\mathrm{UPH})\×\frac{\mathrm{SF}}{16}$

P wherein _cRepresent maximum receiving code power, definition in 3G communication standard 3GPP 25.433, P _RoTRepresentative for suppress to the interference of neighbor cell the maximum power that can distribute, P _{E-base_NodeB}Represent the P that stores in the B node _E-base, SF represents spreading factor.

If TPC command transfer error rate reached 10% and user terminal any TPC order except that " reduction power " order that receives all is construed to " increase power " order, the P that stores in the user terminal so _E-baseTo be much higher than the P that in the B node, stores _E-baseSo the B node can not be controlled to be the user terminal power that receives and be lower than P _RoT, but be much higher than it, so just can not realize that neighbor cell interference controlled.If user terminal is decoded as " reduction power " order, the P that stores in the user terminal so mistakenly with too many " increase power " order _E-baseThe P that stores in the B node will be significantly less than _E-base, this will cause PRRI to be significantly smaller than carrying out the required numerical value of correct power control, thus throughput can be very low, because user terminal can not be with enough power emission, even also be like this when channel condition is very good.

In addition, the TPC scheme of prior art also has a shortcoming, and that is exactly that flexibility is very low.In fact, the TPC of prior art order power adjustment step-length is semi-static.It can be 1dB, 2dB, 3dB that TPC order power is adjusted step-length, need be by radio resource controller (RRC) by control signaling user terminal but change step-length.So in the HSPA+ system, TPC order power is adjusted in fact normally 1dB of step-length.In the HSPA+ system, this semi-static TPC order power is adjusted the power control performance that step-length can not be realized ideal.Because HSUPA serves the normally service of big transmitting power, the interference that the neighbor cell user terminal causes is very big.And user terminal is distributed in different positions, and it all is different carrying out the transmitting users terminal at each Transmission Time Interval (TTI).So if used smart antenna, the fluctuation of channel quality is very large.And user terminal is not launched at each TTI, so along with moving, the channel quality when launching of the channel quality during last emission is may difference very big next time.Following table has provided the deviation of channel quality in the HSPA+ system.

Table one

The TPC order power that is fixed as 1dB of prior art scheme is adjusted step-length and can not be adapted to so big deviation.

So, need a kind of new transmit power controlling method, can under the situation of the existing protocol standard not being made big modification, overcome above-mentioned defective and problem.

Summary of the invention

Technical problem to be solved by this invention provides a kind of method of implementing transmitting power control in wireless network.Described method not only can reduce the error rate of TPC command transfer greatly, and can also realize dynamic TPC order power adjustment step-length, has improved the flexibility and the adaptability of transmit power controlling method greatly.

In order to overcome above-mentioned technical problem, according to the invention provides a kind of method of initiating transmitting power control at receiving terminal, wherein, receiving terminal receives transfer of data from transmitting terminal on data transmission channel, receiving terminal is user terminal or base station, at receiving terminal is under the situation of user terminal, transmitting terminal is the base station, at receiving terminal is under the situation of base station, transmitting terminal is a user terminal, wherein said user terminal is assigned with a plurality of identifiers, be used to identify described user terminal, at least two transmitting powers control TPC orders that correspondence is different respectively in described a plurality of identifier, described method comprises: relatively the quality metrics and the destination channel quality metrics of this data transmission channel are ordered so that determine the TPC that needs are carried out at receiving terminal; From described a plurality of identifiers, select to order corresponding identifier at receiving terminal with the TPC that determines; Send physical control channel from receiving terminal, in physical control channel, adopt the identifier of described selection to come identifying subscriber terminal.

In order to overcome above-mentioned technical problem, a kind of method of implementing transmitting power control at transmitting terminal also is provided according to the present invention, wherein, transmitting terminal sends transfer of data to receiving terminal on data transmission channel, transmitting terminal is user terminal or base station, at transmitting terminal is under the situation of user terminal, receiving terminal is the base station, at transmitting terminal is under the situation of base station, receiving terminal is a user terminal, wherein said user terminal is assigned with a plurality of identifiers, be used to identify described user terminal, in described a plurality of identifier at least two corresponding different respectively transmitting powers control TPC orders, described method comprises: receive physical control channel and extract the identifier of user terminal from the physical control channel that receives at transmitting terminal; Determine and the corresponding TPC order of the identifier that extracts at transmitting terminal; And on data transmission channel, implement transmitting power at transmitting terminal based on described definite TPC order and control.

In order to overcome above-mentioned technical problem, a kind of user terminal of wireless network also is provided according to the present invention, this user terminal receives data transmission channel from the base station, described user terminal comprises: memory, memory allocation is given a plurality of identifiers of this user terminal, described a plurality of identifier is used to identify described user terminal, at least two corresponding different respectively transmitting power control TPC orders in described a plurality of identifiers; Device is determined in the TPC order, and the channel quality of the data transmission channel of more current reception is measured with the destination channel quality metrics so that need to determine the TPC order of execution; Choice device is selected to order corresponding identifier with the TPC that determines from described a plurality of identifiers; And transmitting device, be used to send physical control channel, wherein in this physical control channel, adopt the identifier of described selection to identify described user terminal.

In order to overcome above-mentioned technical problem, a kind of user terminal of wireless network also is provided according to the present invention, this user terminal sends data transmission channel to the base station, described user terminal comprises: memory, memory allocation is given a plurality of identifiers of this user terminal, described a plurality of identifier is used to identify described user terminal, at least two corresponding different respectively transmitting power control TPC orders in described a plurality of identifiers; Receiving system, the identifier that is used for receiving physical control channel and extracts user terminal from the physical control channel that receives; And emission power control device, determine that according to the identifier that extracts the TPC of required execution orders, on data transmission channel, implement transmitting power control based on described definite TPC order.

In order to overcome above-mentioned technical problem, a kind of base station of wireless network also is provided according to the present invention, this base station is to the user terminal to transmit data transmission channel, wherein the described user terminal of wireless network has been assigned with a plurality of identifiers and has been used to identify described user terminal, at least two corresponding different respectively transmitting power control TPC orders in described a plurality of identifier, described base station comprises: receiving system, the identifier that is used for receiving physical control channel and extracts described user terminal from the physical control channel that receives; And emission power control device, determine that according to the identifier that extracts the TPC of required execution orders, on data transmission channel, implement transmitting power control based on described definite TPC order.

In order to overcome above-mentioned technical problem, a kind of base station of wireless network also is provided according to the present invention, this base station receives data transmission channel from user terminal, wherein the described user terminal of wireless network has been assigned with a plurality of identifiers and has been used to identify described user terminal, at least two corresponding different respectively transmitting power control TPC orders in described a plurality of identifier, described base station comprises: device is determined in the TPC order, and the channel quality of the data transmission channel of more current reception is measured with the destination channel quality metrics so that need to determine the TPC order of execution; Choice device is selected to order corresponding identifier with the TPC that determines from described a plurality of identifiers; And transmitting device, be used to send physical control channel, wherein in this physical control channel, adopt the identifier of described selection to identify described user terminal.

In wireless network, all to use identifier to come identifying subscriber terminal.For example in TD-SCDMA system and WCDMA system, Radio Network Temporary Identifier (RNTI) is used to identifying subscriber terminal in physical control channel.For example in HSPA+, user terminal is shared physical control channel.So each user terminal has been assigned with RNTI and has belonged to which user terminal so that stipulate this physical control channel.Because RNTI will be subjected to the protection of physical control channel coding, so its accuracy is identical with the Block Error Rate of physical control channel piece.For example, 16 bit CRC check positions of RNTI and physical control channel piece carry out mould 2 got the verification that appends to physical control channel to the end and.So if the transmission of described physical control channel piece is correct, RNTI also should correctly have been transmitted so.Therefore, the present inventor expects, if RNTI is used for transmitting the probability of the correct transmission of TPC order will the raising greatly TPC order.According to thought of the present invention, identify same user terminal by using a plurality of RNTI, the TPC order that at least two among described a plurality of RNTI are corresponding different respectively simultaneously should comprise two different TPC orders " increase power " and " reduction power " at least.Like this, the TPC order just can transmit by physical control channel, and described TPC order can access the coding gain the same with RNTI.Thereby the error rate of TPC order equals the Block Error Rate of physical control channel, greatly reduces with respect to prior art.Correctly do not receive the TPC order even receive a side of TPC order, a side who sends the TPC order understands that also the TPC order of described mistake can not cause any power control action, because the wrong physical control channel that transmits will be dropped.Therefore, the P in the user terminal _E-baseWith the P in the B node _E-baseCan be consistent, thereby can realize neighbor cell interference control.

In addition, can represent with a plurality of identifiers, therefore can realize power control mode more flexibly, can also realize dynamic TPC order power adjustment step-length because TPC orders.For example, distribute a plurality of RNTI to user terminal, at least two in them correspond respectively to different TPC orders.Because RNTI quantity is many, thereby the TPC that can realize order is also many, for example ± 1dB, ± 2dB, ± 3dB......, thus realized more power adjustment step-length.When channel quality changed fast, the present invention's TPC order flexibly can be so that power control be more effective.

Description of drawings

Fig. 1 illustrates the burst structure of E-AGCH channel;

Fig. 2 illustrates the contrast between E-AGCH Block Error Rate (BLER) and the TPC transmitted error rate;

Fig. 3 illustrates the schematic block diagram according to RNS (RNS) in the wireless network of the present invention;

Fig. 4 illustrates the schematic block diagram according to the user terminal in the wireless network of the present invention (UE);

Fig. 5 illustrates three state and the conversion of user terminal between this three state that user terminal in the present invention can have; And

Fig. 6 illustrates the flow chart that carries out transmit power controlling method in wireless network according to the present invention.

Embodiment

The embodiment of this aspect is described below with reference to accompanying drawings.

Fig. 3 illustrates the schematic block diagram according to RNS (RNS) 300 in the wireless network of the present invention.Only show in the drawings and the assembly or the module that realize that the present invention is relevant, omitted for the assembly same as the prior art or the description of module.But those skilled in the art are after having read instruction of the present invention, can understand being connected and interactive relation of the existence of described prior art assembly or module and they and assembly according to the present invention or module.RNS 300 comprises a plurality of base stations, i.e. B node 340_1-N.RNS 300 also comprises the radio network controller (RNC) 320 that described a plurality of base stations are controlled.It should be noted that the internal frame diagram that only shows B node 340_1 in the drawings, but can understand that other B node 340_2-N has the structure similar to it.

B node 340 receives data transmission channel to the user terminal to transmit data transmission channel with from user terminal.In HSPA and HSPA+ system, described data transmission channel is respectively HSPA and HSPA+ high-speed data transmission channel, and for example High Speed Uplink Packet inserts (HSUPA) channel or high-speed downlink packet inserts (HSDPA) channel.

According to the present invention, the user terminal of wireless network (UE) has been assigned with a plurality of identifiers and has been used to identify described user terminal, at least two corresponding different respectively transmitting power control TPC orders in described a plurality of identifiers.In one embodiment of the invention, by radio network controller (RNC) 320 for user terminal distributes described a plurality of identifiers.It will be appreciated by those skilled in the art that also and can distribute described identifier to user terminal by other entity.Preferably, described identifier is the Radio Network Temporary Identifier (RNTI) that is used for identifying subscriber terminal.As shown in Figure 3, described B node 340 comprises and is used to control the transmit power control module of the transmitting power on the transmitting uplink data channel and is used to carry out the TPC command execution module at the TPC of downlink data transmission channel order that is received.Transmit power control module comprises: device 341 is determined in the TPC order, and the channel quality that is used for the data transmission channel of more current reception is measured with the destination channel quality metrics so that determine the TPC order that needs are carried out; Choice device 342 is selected to order corresponding identifier with the TPC that determines from described a plurality of identifiers; And transmitting device 343, be used to send physical control channel, wherein adopt the identifier of described selection to identify described user terminal.The TPC command execution module comprises: receiving system 345, the identifier that is used for receiving physical control channel and extracts described user terminal from the physical control channel that receives; And emission power control device 346, determine that according to the identifier that extracts the TPC of required execution orders, on data transmission channel, implement transmitting power control based on described definite TPC order.Be included in the corresponding module although among Fig. 3 some independent device are illustrated as, one skilled in the art will appreciate that these devices also can realize independently of each other.It should be noted that above-mentioned transmitting device 343 that is used to send and receive physical control channel and receiving system 345 can be respectively with the transmitting device and the receiving system of the transmission channel that transmits and receive data be same device.Replacedly, described transmitting device and receiving system also can be integrated in the transceiver arrangement.

It will be understood by those skilled in the art that above-mentioned various device can realize by hardware, software, firmware or their combination in any.For example, described device can use the preferred circuit technology of abundant existence in the present technique field to realize.As another example, described various devices can use separation electronic component, use one or more integrated circuits, use programmable circuit or use their combination in any to realize.Described various device also can completely or partially use and utilize one or more processors of suitable software programming to realize.

Fig. 4 illustrates the schematic block diagram according to the user terminal in the wireless network of the present invention 400.Only show in the drawings and the assembly or the module that realize that the present invention is relevant, omitted for the assembly same as the prior art or the description of module.But those skilled in the art are after having read instruction of the present invention, can understand being connected and interactive relation of the existence of described prior art assembly or module and they and assembly according to the present invention or module.This user terminal 400 sends data transmission channel and receives data transmission channel from B node 340 to B node 340.Described user terminal 400 comprises: memory 410, memory allocation is given a plurality of identifiers of this user terminal, described a plurality of identifier is used to identify described user terminal, at least two corresponding different respectively transmitting power control TPC orders in described a plurality of identifiers; Transmit power control module 420 is used to control the transmitting power on the downlink data transmission channel; And TPC command execution module 430, be used to carry out the TPC order that is received at the transmitting uplink data channel.Transmit power control module 420 comprises: device 422 is determined in the TPC order, and the channel quality of the data transmission channel of more current reception is measured with the destination channel quality metrics so that need to determine the TPC order of execution; Choice device 424 is selected to order corresponding identifier with the TPC that determines from described a plurality of identifiers; And transmitting device 426, be used to send physical control channel, wherein adopt the identifier of described selection to identify described user terminal.TPC command execution module 430 comprises: receiving system 432, the identifier that is used for receiving physical control channel and extracts user terminal from the physical control channel that receives; And emission power control device 434, determine that according to the identifier that extracts the TPC of required execution orders, on data transmission channel, implement transmitting power control based on described definite TPC order.Be included in the corresponding module although among Fig. 4 some independent device are illustrated as, one skilled in the art will appreciate that these devices also can realize independently of each other.It should be noted that above-mentioned transmitting device 426 receiving systems 432 that are used to send and receive physical control channel can be respectively with the transmitting device and the receiving system of the transmission channel that transmits and receive data be same device.Replacedly, described transmitting device and receiving system also can be integrated in the transceiver arrangement.

It will be understood by those skilled in the art that above-mentioned various device can realize by hardware, software, firmware or their combination in any.For example, described device can use the preferred circuit technology of abundant existence in the present technique field to realize.As another example, described various devices can use separation electronic component, use one or more integrated circuits, use programmable circuit or use their combination in any to realize.Described various device also can completely or partially use and utilize one or more processors of suitable software programming to realize.

For the ease of understanding, will under background, describe how on the HSUPA channel of the up link between B node 340 and the user terminal 400, to carry out transmitting power control according to the present invention below in detail according to the wireless network of TD-SCDMA standard.But it will be understood by those skilled in the art that to the invention is not restricted to above-mentioned network, also be not limited to above-mentioned uplink channel.In HSUPA, the down link physical control channel is E-AGCH.Like this, TPC order just having become E-AGCH order.

Radio network controller 320 distributes a plurality of RNTI for user terminal 400, at least two corresponding different respectively TPC orders among wherein said a plurality of RNTI.It will be understood by those skilled in the art that RNTI only is a preferred examples of operable identifier, the present invention does not get rid of the identifier that uses other type.Certainly, also can distribute described RNTI to user terminal by other entity, and distribute the number of RNTI to select arbitrarily as required, but according to the needs of transmitting power control, be at least 2, correspond respectively to TPC order " reduction power " and TPC order " increase power ".In this example, radio network controller 320 distributes 7 RNTI for user terminal 400,6 corresponding different respectively TPC order+1dB wherein ,+2dB ,+3dB ,-1dB ,-2dB and-3dB, the increase and the reduction of power do not carried out in a remaining expression.Like this B node 340 just can send flexibly TPC order+1dB ,+2dB ,+3dB ,-1dB ,-2dB and-3dB.It will be appreciated by those skilled in the art that and also can distribute 6 RNTI, respectively corresponding 6 different TPC order+1dB ,+2dB ,+3dB ,-1dB ,-2dB and-3dB.According to a preferred embodiment, radio network controller 320 distributes an original RNTI for earlier user terminal 400, and then generates 6 other RNTI based on this original RNTI.About how generating 6 other RNTI, there is multiple mode.For example when physical control channel is E-AGCH, the RNTI that is used for identifying subscriber terminal 400 is E-DCH Radio Network Temporary Identifier (E-RNTI), it is the sequence of one 16 bit, and other 6 E-RNTI can obtain by the sequence phase XOR of 16 bits that original E-RNTI is different with 6 so.For example,

TPC：+1dB $[x_0{x}_1...x_{15}]\⊕[0101...0100]$

TPC：-1dB $[x_0,x_1...x_{15}]\⊕[0001...0101]$

TPC：+2dB $[x_0{x}_1...x_{15}]\⊕[1010...1000]$

TPC：-2dB $[x_0{x}_1...x_{15}]\⊕[0010...1010]$

TPC：+3dB $[x_0{x}_1...x_{15}]\⊕[1111...1100]$

TPC：-3dB $[x_0{x}_1...x_{15}]\⊕[0011...1111]$

Preferably, corresponding to the E-RNTI of " increase power " and corresponding to the mutual vector distance between the E-RNTI of " reduction power " (that is, and Euclidean distance, it refers in the n-dimensional space distance between two points.For example, in two-dimensional space, the Euclidean distance between two points (0,0) and (3,4) is

) greater than corresponding between those E-RNTI of " increase power " and corresponding to the mutual vector distance between those E-RNTI of " reduction power ".More preferably, has big mutual vector distance between described 7 E-RNTI.It will be understood by those skilled in the art that mutual vector distance is big more, the probability that an E-RNTI mistake is decoded as another E-RNTI is more little, because vector distance has reflected vector (that is similitude E-RNTI).Therefore, distribute preferably for user terminal 400 and have the maximum E-RNTI of vector distance mutually that can realize.Certainly, distribute such E-RNTI also can for user terminal 400, the mutual vector distance between the described E-RNTI is greater than a threshold value.In a preferred embodiment, with described original E-RNTI and 6 sequences that have big mutual vector distance each other XOR mutually, so that had 7 E-RNTI of big vector distance each other.

It will be understood by those skilled in the art that and also can adopt alternate manner to obtain other 6 E-RNTI, for example pass through forms mode.In the form of setting up, corresponding 6 other E-RNTI of each original E-RNTI have distributed after the original E-RNTI, and other 6 E-RNTI can obtain by the mode of tabling look-up.It will be understood by those skilled in the art that the present invention is not limited to the above-mentioned mode of obtaining a plurality of E-RNTI, any mode that can access a plurality of E-RNTI all is applicable to the present invention.

After distributing 7 E-RNTI, just can begin according to transmit power controlling method of the present invention.In this embodiment of the present invention, B node 340 is communicated by letter on uplink data transmission channel (being the HUSPA data transmission channel in this example) with user terminal 400.In case B node 340 receives the HUSPA data transmission channel that sends from described user terminal 400, the channel quality that the definite device 341 of TPC order of B node 340 is just measured the HUSPA data transmission channel of current reception is measured.Described channel quality is measured and can be characterized with signal to noise ratio (snr), Block Error Rate (BLER) or the error rate (BER) or the like parameter.Then, the definite device 341 of TPC order is measured the channel quality of measuring with the destination channel quality metrics and is compared.The destination channel quality metrics is the desired value that channel quality is measured, and indicates the HUSPA data transmission channel to wish the channel quality that reaches.Generally speaking, it is that current HUSPA data transmission channel quality and this HUSPA data transmission channel are to the interference of adjacent channel, sub-district or a compromise between institute's consumed power.Those skilled in the art understand, under the changeless situation of other condition, the channel quality that current channel will be realized is high more, and needed transmitting power is just high more, thereby the power that consumes is also many more, and this transmitting power is also big more to the interference of neighbor cell or adjacent channel.Remain on a suitable value so wish channel quality, that is, and the destination channel quality.It had both guaranteed that current channel can correctly receive, again energy minimization to the interference of neighbor cell or channel so that realize the maximization of overall system performance, perhaps energy minimization power consumption again.Measure with described destination channel quality metrics by the channel quality of measuring on the HSUPA data transmission channel with current reception and to compare, can determine that the transmitting power on the current HSUPA data transmission channel is to need to increase or reduce.For example, if signal to noise ratio (snr) is lower than desired value or Block Error Rate (BLER), the error rate (BER) is higher than desired value, so current HSUPA data transmission channel just needs to increase transmitting power and improve current channel signal to noise ratio (snr) and reduce the Block Error Rate (BLER) or the error rate (BER).So the TPC order that needs to carry out is exactly " increase power " order.On the other hand, if signal to noise ratio (snr) is higher than desired value or Block Error Rate (BLER), the error rate (BER) is lower than desired value, the quality of so current receive channel just is better than the destination channel quality, just reduce transmitting power, like this can saving power or reduce interference to neighbor cell or channel.So the TPC order that needs to carry out is exactly " reduction power " order.For scheme, can determine that needing to adjust how many transmitting powers could realize the destination channel quality according to the difference size between measured value and the desired value with a plurality of adjustment step-lengths.Adjustment amount if desired is big, just selects bigger adjustment step-length, otherwise just adopts less adjustment step-length.In this way, need can determine the TPC that carries out to order.Certainly, it will be understood by those skilled in the art that described destination channel quality metrics also can be the target zone that channel quality is measured.If the channel quality of measuring so just can keep transmitting power constant, thereby do not need to send any TPC order within described target zone.If the channel quality of measuring is better than the last dividing value of described target zone, just reduces transmitting power, thereby need to carry out TPC order " reduction power ".If the channel quality of measuring is worse than the floor value of described target zone, just needs to increase transmitting power, thereby need to carry out TPC order " increase power ".The mode that it will be understood by those skilled in the art that any definite transmission channel aimed quality can be applicable to the present invention.

After having determined the TPC order that needs to carry out, the choice device 343 of B node 340 just selects one to order the identifier of corresponding identifier as this user terminal 400 with definite TPC from a plurality of identifiers of distributing to the user terminal 400 that therefrom receives the HSUPA data transmission channel.For example,, so just select to order corresponding E-RNTI, as the identifier that is used in the user terminal 400 in (being E-AGCH in this example) in the physical control channel with this TPC if determined to need to carry out TPC order+2dB.After this, just can will use the physical control channel of above-mentioned selected E-RNTI to send to user terminal 400 by the transmitting device 343 of the transmission physical control channel of B node 340.

After the receiving system 432 of user terminal 400 received above-mentioned E-AGCH control channel, it extracted the identifier of this user terminal 400, i.e. E-RNTI from E-AGCH.After this, the emission power control device 434 of user terminal 400 is determined the TPC order of required execution according to the E-RNTI that extracts, and implements transmitting power based on described definite TPC order on the HSUPA data transmission channel and control.For example, after having determined aforesaid TPC order+2dB, just the transmitting power on the HSUPA data transmission channel is increased 2dB according to this TPC order.After this, B node 340 continues the channel quality on the monitoring HSUPA data transmission channel and measures decision according to the channel quality of measuring and whether initiate new transmitting power control, if and decision initiates transmitting power control, so also to determine to need to send which type of TPC order.In this way, just can realize the transmitting power control of up link.

In order to further describe operation principle of the present invention, Fig. 5 illustrates three state and the conversion of user terminal 400 between this three state that user terminal 400 is had according to the present invention in the above example.As mentioned above, HSUPA user terminal 400 has 7 E-RNTI.According to a preferred embodiment, original E-RNTI does not also correspond to any TPC order.When some traditional user terminal can not support that new TPC proposed by the invention orders, B node 340 can use original E-RNTI to identify this user terminal, this means that the TPC order will transmit according to the conventional method, just transmit in the traditional TPC command field in physical control channel, for example the TPC field among the E-AGCH.If when user terminal 400 can support that described new TPC orders, the B node just can use other 6 E-RNTI with TPC implication to identify this user terminal 400.Originally the field that was used for transmitting the TPC order can be used for transmitting out of Memory, for example is used for expanding the simultaneous bias SS command field of physical control channel.For example described traditional TPC command field only repeats the content of SS command field so that improve the probability of the correct transmission of SS order, and perhaps described traditional TPC command field is used for making the step-length of SS order more flexible.On the other hand, if the resource-constrained of E-RNTI, use of the present invention is restricted, and so also can use original E-RNTI.Use original E-RNTI to show in this Transmission Time Interval (TTI) and will carry out transmitting power control according to traditional TPC command field.If used original E-RNTI among the N continuous TTI, this means that after this all nonprimitive E-RNTI of this user terminal are invalid, wherein the size of N can be selected as required, N 〉=2.

Therefore, for a user terminal, it has three kinds of states:

1. do not have high-speed data transmission service, in this state, do not set up any HSUPA service;

2.TPC E-RNTI, this state are when having set up the HSUPA service, support the default setting of the user terminal of new TPC order proposed by the invention.In this state, user terminal should be construed to E-RNTI the TPC order;

3. original TPC, this state are the default settings of not supporting the user terminal of new TPC order proposed by the invention.In this state, only use traditional method to obtain the TPC order that needs are carried out according to the TPC command field in the physical control channel.

If do not set up any HSUPA service, user terminal will be in " not having high-speed data transmission service " so.In case distributed high-speed data transmission service, whether user terminal will support new TPC order according to the present invention to change to state " TPC E-RNTI " or " original TPC " according to it.Under state " TPC E-RNTI " or " original TPC ", user terminal will remain under the described state usually, until the end of HSUPA service.In case finish described HSUPA service, user terminal just turns back to state from state " TPC E-RNTI " or " original TPC " " does not have high-speed data transmission service ".Receive original E-RNTI if be in a user terminal N continuous TTI of " TPC E-RNTI " state, user terminal will get the hang of " original TPC " so, and it is invalid that nonprimitive E-RNTI becomes, until the end of HSUPA service.

Though above for brevity, only describe with reference to the accompanying drawings and how in up link HSUPA, to carry out transmitting power control, but those skilled in the art can understand after the instruction of having read specification, and similar flow process is followed in the transmitting power control on the down link HSDPA in identical network.But the transmitting terminal of data transmission channel has become B node 340, the receiving terminal of data transmission channel has become user terminal 400, and data transmission channel is the HSDPA data transmission channel, and physical control channel also becomes HS-SCCH, and described TPC order becomes a HS-SCCH order.Simultaneously, what monitor the data transmission channel that receives and initiate transmitting power control is the transmit power control module of user terminal 400, i.e. device 422, choice device 424 and transmitting device 426 are determined in the TPC of user terminal 400 order.And receive the TPC order and what carry out transmitting power control is the TPC command execution module of B node 340, i.e. the receiving system 345 of B node 340 and emission power control device 346.

Fig. 6 illustrates the flow chart of the transmit power controlling method that carries out in wireless network according to the present invention.Described method both can be carried out uplink channel, also can carry out downlink channel.When a specific embodiment according to the present invention was carried out transmitting power control to uplink channel, described transmitting terminal and receiving terminal were respectively user terminal and base station, i.e. the B node.When another specific embodiment according to the present invention was carried out transmitting power control to downlink channel, described transmitting terminal and receiving terminal were respectively B node and user terminal.

Get back to Fig. 6, the user terminal of being discussed in the wireless network 400 is assigned with a plurality of identifiers at step S601, is used to identify described user terminal 400, at least two corresponding different respectively transmitting power control TPC orders in described a plurality of identifiers.Then at receiving terminal execution in step S602, S603 and the S604 of data transmission channel.At step S602, the quality metrics of the data transmission channel of more current reception and destination channel quality metrics are so that need to determine the TPC that carries out to order.At step S603, from described a plurality of identifiers, select to order corresponding identifier with the TPC that determines.At step S604, send physical control channel, in physical control channel, adopt the identifier of described selection to come identifying subscriber terminal 400.

Then at transmitting terminal execution in step S605, S606 and the S607 of data transmission channel.At step S605, described transmitting terminal receives physical control channel and extract the identifier of user terminal 400 from the physical control channel that receives.At step S606, determine and the corresponding TPC order of the identifier that extracts.At step S607, on data transmission channel, implement power control at last based on described definite TPC order.

Below in conjunction with the accompanying drawings and with reference to the preferred embodiments of the present invention the present invention is described in detail; but those skilled in the art will know that; foregoing detailed description only is for the present invention that explains, and never is protection scope of the present invention to be restricted to above-mentioned specific embodiment.Scope of the present invention is only limited by claims.Under the situation that does not break away from described claim institute restricted portion, those skilled in the art can make various modifications and variations to the foregoing description, and described modification and modification fall into protection scope of the present invention equally.

In claims, be positioned at any Reference numeral between round parentheses and do not constitute restriction claim." comprise " that a speech do not get rid of element listed in the claim or other element outside the step or the existence of step.Word " " before the element or " a kind of " do not get rid of and have a plurality of these elements.

The present invention can realize by the hardware that comprises different elements, also can be by the computer realization of suitable programming.In enumerating the equipment claim of several means, several means can realize with one or more hardware entities.In mutually different dependent claims, set forth true of some measure and do not mean that the combination of these measures can not advantageously use only.

Claims (21)

1. initiate the method for transmitting power control at receiving terminal for one kind,

Wherein, receiving terminal receives transfer of data from transmitting terminal on data transmission channel, receiving terminal is user terminal or base station, is under the situation of user terminal at receiving terminal, and transmitting terminal is the base station, at receiving terminal is under the situation of base station, transmitting terminal is a user terminal, and wherein said user terminal (400) is assigned with a plurality of identifiers (S601), is used to identify described user terminal (400), at least two corresponding different respectively transmitting power control TPC orders in described a plurality of identifier

Described method comprises:

Relatively the quality metrics and the destination channel quality metrics of this data transmission channel are ordered (S602) so that determine the TPC that need carry out at receiving terminal;

From described a plurality of identifiers, select to order corresponding identifier (S603) at receiving terminal with the TPC that determines;

Send physical control channel (S604) from receiving terminal, in physical control channel, adopt the identifier of described selection to come identifying subscriber terminal (400).

2. according to the process of claim 1 wherein, described data transmission channel is HSPA or HSPA+ high-speed data transmission channel.

3. according to the method for claim 2, wherein, if described TPC order is used for up-link transmission power control, then described physical control channel is the E-AGCH channel, if described TPC order is used for down-link transmitting power control, then described physical control channel is the HS-SCCH channel.

4. according to the process of claim 1 wherein, distribute a plurality of identifiers to comprise for user terminal (400):

Distribute an original identifier for user terminal (400),

Produce other identifier based on described original identifier; And

Give user terminal (400) with other identifier allocation that is produced.

5. according to the method for claim 4, wherein, produce other identifier based on described original identifier and comprise described original identifier and the sequence XOR that has big vector distance are each other produced described other identifier.

6. according to the method for claim 4 or 5, wherein, described original identifier does not correspond to the TPC order, the TPC order that described other identifier is corresponding different respectively.

7. according to the method for claim 6, wherein,, show that then the TPC field in the described physical control channel of employing is carried out transmitting power control in the Transmission Time Interval TTI of correspondence if adopt original identifier identifying subscriber terminal (400).

8. according to the method for claim 7, wherein, if used original identifier in a N continuous Transmission Time Interval TTI, the identifier beyond the then original identifier is invalid, wherein N 〉=2.

9. according to any one method among the claim 1-5, wherein, the TPC field in the described physical control channel is used to simultaneous bias (SS) field.

10. according to the method for claim 9, wherein, the TPC field in the described physical control channel repeats the content of simultaneous bias (SS) field.

11. according to any one method among the claim 1-4, wherein, described a plurality of identifiers are selected as having big vector distance each other.

12. according to any one method among the claim 1-5, wherein, described a plurality of identifiers are Radio Network Temporary Identifiers of distributing to user terminal (400).

13. according to any one method among the claim 1-5, wherein, described a plurality of identifiers are distributed to user terminal (400) by radio network controller.

14. according to any one method among the claim 1-5, wherein, described wireless network is followed the TD-SCDMA standard.

15. according to any one method among the claim 1-5, wherein, described TPC order comprises that power increase order that increases the predetermined power amount and the power that reduces the predetermined power amount reduce order.

16. according to the method for claim 15, wherein, described TPC order comprises+1dB ,+2dB ,+3dB ,-1dB ,-2dB and-3dB.

17. the method in the control of transmitting terminal enforcement transmitting power,

Wherein, transmitting terminal sends transfer of data to receiving terminal on data transmission channel, transmitting terminal is user terminal or base station, is under the situation of user terminal at transmitting terminal, and receiving terminal is the base station, at transmitting terminal is under the situation of base station, receiving terminal is a user terminal, and wherein said user terminal (400) is assigned with a plurality of identifiers (S601), is used to identify described user terminal (400), at least two corresponding different respectively transmitting power control TPC orders in described a plurality of identifier

Described method comprises:

Receive physical control channel and from the physical control channel that receives, extract the identifier (S605) of user terminal (400) at transmitting terminal;

Determine and the corresponding TPC order of the identifier that extracts (S606) at transmitting terminal; And

On data transmission channel, implement transmitting power control (S607) at transmitting terminal based on described definite TPC order.

(340) receive data transmission channel 18. the user terminal of a wireless network (400), this user terminal (400) are from the base station, and described user terminal (400) comprising:

Memory (410), memory allocation is given a plurality of identifiers of this user terminal (400), and described a plurality of identifiers are used to identify described user terminal (400), at least two corresponding different respectively transmitting power control TPC orders in described a plurality of identifiers;

Device (422) is determined in the TPC order, and the channel quality of the data transmission channel of more current reception is measured with the destination channel quality metrics so that need to determine the TPC order of execution;

Choice device (424) is selected to order corresponding identifier with the TPC that determines from described a plurality of identifiers; With

Transmitting device (426) is used to send physical control channel, wherein adopts the identifier of described selection to identify described user terminal (400) in this physical control channel.

19. the user terminal of a wireless network (400), this user terminal (400) sends data transmission channel to base station (340), and described user terminal (400) comprising:

Memory (410), memory allocation is given a plurality of identifiers of this user terminal (400), and described a plurality of identifiers are used to identify described user terminal (400), at least two corresponding different respectively transmitting power control TPC orders in described a plurality of identifiers;

Receiving system (432) is used for receiving physical control channel and extracts the identifier of user terminal (400) from the physical control channel that receives; With

Emission power control device (434) determines that according to the identifier that extracts the TPC of required execution orders, and implements transmitting power control based on described definite TPC order on data transmission channel.

20. the base station of a wireless network (340), this base station (340) send data transmission channel to user terminal (400),

Wherein the described user terminal (400) of wireless network has been assigned with a plurality of identifiers and has been used to identify described user terminal (400), at least two corresponding different respectively transmitting powers control TPC orders in described a plurality of identifiers, and described base station (340) comprising:

Receiving system (345), the identifier that is used for receiving physical control channel and extracts described user terminal (400) from the physical control channel that receives; And

Emission power control device (346) determines that according to the identifier that extracts the TPC of required execution orders, and implements transmitting power control based on described definite TPC order on data transmission channel.

21. the base station of a wireless network (340), this base station (340) receive data transmission channel from user terminal (400),

Wherein the described user terminal (400) of wireless network has been assigned with a plurality of identifiers and has been used to identify described user terminal (400), at least two corresponding different respectively transmitting powers control TPC orders in described a plurality of identifiers, and described base station (340) comprising:

Device (341) is determined in the TPC order, and the channel quality of the data transmission channel of more current reception is measured with the destination channel quality metrics so that need to determine the TPC order of execution;

Choice device (342) is selected to order corresponding identifier with the TPC that determines from described a plurality of identifiers; With

Transmitting device (343) is used to send physical control channel, wherein adopts the identifier of described selection to identify described user terminal (400) in this physical control channel.

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