CN1734968B

CN1734968B - Out-ring power control method for upline enhancement special channel

Info

Publication number: CN1734968B
Application number: CN 200410088722
Authority: CN
Inventors: 王婷; 李小强; 张玉建; 杜高科; 李周镐
Original assignee: Beijing Samsung Telecommunications Technology Research Co Ltd; Samsung Electronics Co Ltd
Current assignee: Beijing Samsung Telecommunications Technology Research Co Ltd; Samsung Electronics Co Ltd
Priority date: 2004-08-10
Filing date: 2004-11-01
Publication date: 2012-01-04
Anticipated expiration: 2024-11-01
Also published as: CN1734968A

Abstract

An operation method for uplink outer loop power control in E-DCH, comprising steps: Node B measures uplink reception quality and reports to RNC; RNC sets the target signal-to-noise ratio of outer loop power control according to the uplink reception quality of DCH transmission channel; RNC transmits the target SNR to Node B; RNC sets an additional E-DPDCH/DPCCH power offset according to the QoS and uplink reception quality of E-DCH and DCH; RNC will add E-DPDCH/DPCCH power offset Pass it to UE; RNC transmits additional E-DPDCH/DPCCH power offset to Node B; UE decides uplink E-DPDCH/DPCCH power offset and additional E-DPDCH/DPCCH power offset according to Rel99 DPDCH transmit power, transmit E-DCH data. The present invention can compensate the difference between the SIR targets of the E-DCH and DCH in the outer loop power control, and can avoid setting the SIR target according to the service with a higher SIR target in Rel99, thus avoiding another channel with lower requirements on the SIR target Transmitting with unnecessary high power reduces uplink interference. The invention enables RNC to control the physical layer transmission times of E-DCH data.

Description

Outer loop power control method for uplink enhanced dedicated channel

Technical Field

The present invention relates to third generation mobile communication, and more particularly, to a method for controlling uplink outer loop power in an E-DCH.

Background

The second generation mobile communication System includes gsm (global System for mobile communications) and IS (inter Standard) -95, and a main object IS to provide voice service. GSM, which used TDMA technology and was commercially available in 1992, was used primarily in europe and china. And IS-95 adopts a code division multiple access technology, mainly used in the united states and korea.

Currently, mobile communication technology has evolved into a third generation mobile communication system, which provides high-rate and high-quality data service and multimedia service in addition to voice service. The third generation mobile communication system includes an asynchronous CDMA system (or referred to as WCDMA system or UMTS) studied by the 3GPP international organization for standardization, i.e., timing between base stations is asynchronous, and a synchronous CDMA system (or referred to as CDMA2000) studied by the 3GPP2 international organization for standardization, i.e., timing between base stations is the same.

Both synchronous and asynchronous third generation mobile communication systems are standardizing for providing high rate, high quality data packet services. For example: while 3GPP is standardizing HSDPA (high speed downlink access for short) to increase the Data rate of downlink, 3GPP2 is standardizing lxEV-DV (Evolution-Data and Voice). The 3GPP continues to perform an enhanced uplink packet data transmission (E-DCH) again, thereby improving the capacity and coverage of the uplink. Compared with the uplink DCH of Rel99/4/5, the E-DCH moves the scheduling function from the RNC to the Node B to realize quick scheduling; a harq (hybrid Automatic Retransmission request) mechanism is introduced, and Retransmission is performed in the physical layer.

The kind of physical channel after introducing the E-DCH is shown in fig. 7. The method comprises 701 Dedicated Physical Control Channel (DPCCH) in Rel99, 702 Dedicated Physical Data Channel (DPDCH), 705 uplink control channel HS-DPCCH for HSDPA in Rel5, 703 enhanced dedicated physical data channel (E-DPDCH) for transmitting E-DCH data after introducing the uplink enhanced dedicated channel, and 704 enhanced dedicated physical control channel (E-DPCCH) for transmitting control information for decoding E-DPDCH, such as E-TF (E-DCH transport format), scheduling information, HARQ information (such as received sequence number RSN), and the like. The E-DCH and DCH are present in two coded composite transport channels CcTrCH.

In the WCDMA system of Rel99, an outer loop power control mechanism is employed. The purpose is to maintain the communication quality at a set target value. If the communication quality is too high, wireless resources are wasted; the communication quality is too low to meet the communication requirement. The outer loop power control functions to keep the communication quality stable by setting a proper target signal-to-noise ratio (SIR target) for fast power control. Under different channel conditions, the target signal-to-noise ratio (SIR target) is different in order to achieve a certain target block error rate (BLER target). And the fast power control of the inner ring is compared with the actual signal-to-noise ratio (SIR) according to the target SIR target set by the power control of the outer ring to complete the power control of the inner ring. The adjusting frequency of the outer loop power control is 10-100 Hz.

Taking the uplink outer loop power control as an example, the RNC estimates the uplink reception quality after macro diversity, when the reception quality is better than the target requirement, the RNC decreases the SIR target, and when the reception quality is lower than the target requirement, the RNC increases the SIR target and transmits the SIR target to the Node B through a higher layer signaling. There are several methods for uplink quality estimation, such as: the result of block error rate BLER detected based on CRC, or transport channel bit error rate (TrCH BER), or physical channel bit error rate (physical channel BER), or SIR, or Eb/NO, or other methods.

In Rel99, for the case of multiple services in the uplink, the multiple services are multiplexed onto one coded composite transport channel (CcTrCH). Because multiple services have a common fast power control, the multiple services only correspond to a common SIR target, and the SIR target is determined according to the service with the highest requirement on the SIR target by the RNC for estimating the uplink receiving quality of each service. Due to the adoption of non-uniform rate matching, there is no large gap between the SIR target of multiple services. As shown in fig. 1, the operation method of outer loop power control in the case of coexistence of multiple services in Rel99 is explained.

In Rel99, the DPDCH/DPCCH power offset is related to the TFC used by the DPDCH, and there are two calculation methods: one is that UE obtains the DPDCH/DPCCH normalized power offset corresponding to each TFC in TFCS through high-level signaling, namely DPDCH/DPCCH gain factor, and the other is that UE obtains the DPDCH/DPCCH normalized power offset corresponding to each TFC through calculation, namely DPDCH/DPCCH gain factor. For detailed calculation, refer to 3GPP TS25.214, section 5.1.2.5. In the present invention, the power offset of DPDCH/DPCCH is the dB value of the ratio of the power of DPDCH to the power of DPCCH, i.e., the power offset (dB) of DPDCH/DPCCH is 10 × log₁₀(DPDCH power (milliwatts)/DPCCH power (milliwatts)). The E-DPDCH/DPCCH power offset refers to the dB value of the ratio of the E-DPDCH power and the DPCCH power, i.e. the E-DPDCH/DPCCH power offset (dB) is 10 log₁₀(E-DPDCH power (milliwatts)/DPCCH power (milliwatts)). The E-DPCCH/DPCCH power offset is a dB value of a ratio of E-DPCCH power to DPCCH power, i.e. the E-DPCCH/DPCCH power offset (dB) is 10 log₁₀(E-DPCCH power (milliwatts)/DPCCH power (milliwatts)). This definition applies to the following description.

Because the uplink enhanced dedicated transport channel E-DCH is introduced, the E-DCH transport channel and the dedicated transport channel DCH can exist simultaneously, and the E-DCH and the DCH are respectively loaded on different CcTrCHs for code division multiplexing. Since the E-DCH and the DCH use the same fast power control process, the E-DCH and the DCH need to carry out outer loop power control by the common SIR target. According to the fast power control method of Rel99, the SIR target is set according to the reception quality of the DPDCH, but the resulting TPC command is applied to the DPCCH to directly change the power of the DPCCH and indirectly change the power of the DPDCH. Hereinafter, the SIR target of the DCH refers to the SIRtarget set according to the reception quality of the DPDCH, and the SIR target of the E-DCH refers to the SIRtarget set according to the reception quality of the E-DPDCH. Due to the different characteristics of the E-DCH and DCH channels, such as: the E-DCH and the DCH have different QoS because different services (such as the E-DCH carries packet service and the DCH carries voice service) can be carried; E-DCH has a physical layer retransmission mechanism, while DCH does not; the coding chains of the E-DCH and the DCH are different; the E-DCH may differ from the DCH TTI; the effect of macro diversity is different, and these differences result in different SIR targets required for E-DCH and DCH.

Unlike Rel99, E-DCH and DCH cannot narrow the difference in SIR target by non-uniform rate matching, so the difference in SIR target may be large. If the SIR target is set according to the reception quality and QoS requirements of one of the channels, it may result in the reception quality of the other channel not meeting the requirements. Or if the SIR target is set according to the principle of Rel99 and the SIR target is higher, another channel with lower SIR target requirement may be caused to transmit with unnecessarily large power, thereby causing larger uplink interference. It is therefore necessary to introduce the method of the present invention to compensate for the difference in SIR target for E-DCH and DCH.

Disclosure of Invention

The invention aims to provide a method for controlling uplink and downlink outer loop power in an E-DCH, which can compensate the transmission power of the E-DPDCH when the SIR target of the E-DCH is different from that of the DCH.

According to an aspect of the present invention, an operating method for outer loop power control of an uplink data channel in an E-DCH includes the steps of:

node B measures up going receiving quality and reports to RNC;

RNC sets the target signal-to-noise ratio of outer ring power control according to the up receiving quality of DCH transmission channel;

RNC transmits the target signal-to-noise ratio to Node B;

RNC sets an additional E-DPDCH/DPCCH power offset according to QoS and uplink receiving quality of E-DCH and DCH;

the RNC transmits the power offset of the additional E-DPDCH/DPCCH to the UE;

RNC transmits the power offset of the additional E-DPDCH/DPCCH to Node B;

and the UE determines the transmission power of the uplink E-DPDCH according to the E-DPDCH/DPCCH power offset and the additional E-DPDCH/DPCCH power offset in the Rel99 and transmits E-DCH data.

According to another aspect of the present invention, an operating method for outer loop power control of an uplink control channel in an E-DCH comprises the steps of:

RNC sets initial value of power offset of E-DPCCH/DPCCH and transmits it to UE

RNC sets the initial value of the power offset of E-DPCCH/DPCCH and transmits it to Node B;

the RNC reconfigures the power offset of the E-DPCCH/DPCCH;

the RNC transmits the reconfigured E-DPCCH/DPCCH power offset to the UE;

RNC transmits the reconfigured E-DPCCH/DPCCH power offset to Node B;

the UE calculates E-DPCCH transmission power according to the power offset of the E-DPCCH/DPCCH and transmits the E-DPCCH.

The invention can compensate the difference of SIRtarget of E-DCH and DCH caused by the following reasons in the outer loop power control: the E-DCH and the DCH have different QoS due to different possibly carried services (for example, the E-DCH carries packet service, and the DCH carries voice service); E-DCH has a physical layer retransmission mechanism, while DCH does not; the coding chains of the E-DCH and the DCH are different; the E-DCH may differ from the DCH TTI; the effect of macro diversity is different. The difference between the SIR targets of the E-DCH and the DCH in the outer loop power control is compensated, the SIR target can be prevented from being set according to the service with higher SIR target in Rel99, and therefore the phenomenon that another channel with lower requirement on the SIR target is transmitted with unnecessarily large power is avoided, and further uplink interference is reduced. The invention can make RNC control the physical layer transmission times of E-DCH data.

Drawings

Fig. 1 is a schematic diagram of outer loop power control in the case of multi-traffic in Rel 99;

FIG. 2 is a flow chart of outer loop power control of an uplink data channel in E-DCH in accordance with the present invention;

FIG. 3 is a flow chart of RNC operation in E-DCH outer loop power control;

FIG. 4 is a flow chart of Node B operation in E-DCH outer loop power control;

FIG. 5 shows an embodiment of the additional E-DPDCH/DPCCH power offset setting in the E-DCH;

FIG. 6 is E-DPDCH/DPCCH gain factor calculation;

fig. 7 is an uplink physical channel category;

fig. 8 is a flow chart of outer loop power control of the uplink control channel in E-DCH in accordance with the present invention.

Detailed Description

The invention provides a method for controlling the outer loop power of an uplink data channel in an E-DCH, which comprises the following steps as shown in figure 2:

201: node B measures the up receiving quality and reports it to RNC, including DCH up receiving quality and E-DCH up receiving quality;

202: RNC sets the target signal-to-interference ratio (SIR target) of outer ring power control according to the up receiving quality of DCH transmission channel;

203: RNC transmits the target signal-to-noise ratio to Node B;

204: the RNC sets an additional E-DPDCH/DPCCH power offset (additional E-DPDCH/DPCCH power offset) according to the QoS and the uplink receiving quality of the E-DCH and the DCH;

205: the RNC transmits an additional E-DPDCH/DPCCH power offset (additional E-DPDCH/DPCCHPower offset) to the UE;

206: RNC sends additional E-DPDCH/DPCCH power offset to Node B;

207: and the UE determines the transmission power of the uplink E-DPDCH according to the E-DPDCH/DPCCH power offset and an additional E-DPDCH/DPCCH power offset in the Rel99, and transmits E-DCH data.

The E-DPDCH/DPCCH power offset in Rel99 refers to the E-DPDCH/DPCCH power offset corresponding to the E-DCH transport format (E-TF) one-to-one, because the DPDCH/DPCCH gain factors correspond to the DCH Transport Format Combinations (TFCs) one-to-one in Rel99, in this sense, the E-DPDCH/DPCCH power offset corresponding to the E-DCH transport format (E-TF) one-to-one is called as the E-DPDCH/DPCCH power offset in Rel 99. The additional E-DPDCH/DPCCH power offset refers to an additional E-DPDCH/DPCCH power offset common to all E-TF independent of an E-DCH transport format (E-TF).

In the present invention, the RNC determines a target signal-to-interference ratio (SIR target) of the outer loop power control and an additional power offset, and can change the E-DCH average number of transmissions by changing the additional offset.

Operation of the RNC:

as shown in fig. 3.

301: the RNC sets a target signal-to-interference ratio (SIR target) for outer loop power control based on the uplink reception quality of the DCH transport channel, the SIR target will decrease when the uplink reception quality is higher than the target value, the SIR target will increase when the uplink reception quality is lower than the target value, and then the RNC transmits the SIR target value to the Node B through NBAP signaling, which is the same process as in Rel 99.

302: the RNC sets an additional E-DPDCH/DPCCH power offset. Since the target signal-to-noise ratio (SIRtarget) of the outer loop power control is set according to the uplink reception quality of the DCH without considering the reception quality of the E-DCH, the RNC sets an additional E-DPDCH/DPCCH power offset, which serves to compensate for the difference between the SIR targets of the E-DCH and the DCH. The additional power offset is set according to the QoS of the E-DCH and the receiving quality of the uplink DCH and the E-DCH. Due to the variation of channel conditions, different code chains of DCH and E-DCH, different TTIs and different gains of macro diversity, the SIR target of E-DCH and DCH varies, so the additional E-DPDCH/DPCCH power offset is introduced to compensate the difference of SIRtarget.

303: RNC transmits additional E-DPDCH/DPCCH power offset) to the UE. The signaling may be through RRC signaling, FP signaling, or through other methods.

The transmission of the additional E-DPDCH/DPCCH power offset may be transmitted periodically or in an event-triggered manner.

304: the RNC transmits an additional E-DPDCH/DPCCH power offset (additional E-DPDCH/DPCCHPower offset) to the Node B. Its purpose is for Node B scheduling.

Operation of Node B:

401: node B measures up receiving quality and reports it to RNC, including DCH up receiving quality and E-DCH up receiving quality. The uplink reception quality may be a block error rate, i.e. a CRC check result, or a transport channel bit error rate, a physical channel bit error rate, SIR, or Eb/NO. The number of E-DCH data transmissions may also be reported to the RNC.

402: and the Node B receives a target signal-to-noise ratio set by the RNC and performs uplink inner-loop power control according to the target signal-to-noise ratio.

403: the Node B receives the additional power offset from the RNC, and the additional power offset is used for more accurately estimating the uplink ROT, so that the Node B scheduling is carried out.

Operation of the UE:

and the UE determines the transmission power of the uplink E-DPDCH according to the E-DPDCH/DPCCH power offset and an additional E-DPDCH/DPCCH power offset in the Rel99, and transmits E-DCH data.

The invention is also suitable for the situation of a plurality of DCH, when a plurality of DCH exist at the same time, the SIRtarget of the outer loop power control can be determined according to the DCH with the highest SIR target requirement, and the additional E-DPDCH/DPCCH power offset can be determined by comparing the DCH with the highest SIR target requirement with the E-DCH, which is the same as the processing procedure of Rel 99.

The invention is not only suitable for the case of non-soft handover (None SHO), but also suitable for the case of Soft Handover (SHO). For the case of soft handover, the setting of the outer loop power control SIR target is based on the result of DCH after macro diversity, and the setting of the additional E-DPDCH/DPCCH power offset is based on the result of E-DCH after macro diversity and the result of DCH. And, in case of soft handover, the RNC shall transmit the additional E-DPDCH/DPCCH power offset to the scheduling Node B, or to the non-scheduling Node B at the same time.

The method is not only suitable for the condition that the E-DCH bears one kind of QoS data, but also suitable for the condition that the E-DCH bears a plurality of kinds of QoS data. Under the condition that the E-DCH bears various QoS data, the RNC can respectively set additional E-DPDCH/DPCCH power offset (additional E-DPDCH/DPCCH power offset) aiming at the difference of the QoS of the E-DCH bearing data; alternatively, the same additional E-DPDCH/DPCCH power offset may be set for all QoS carried by the E-DCH.

The invention provides a method for controlling the outer ring power of an uplink control channel in an E-DCH, which comprises the following steps as shown in figure 8:

801: RNC sets the initial value of the power offset of E-DPCCH/DPCCH and transmits the initial value to UE;

802: RNC sets the initial value of the power offset of E-DPCCH/DPCCH and transmits it to Node B;

803: the RNC calculates the power offset of the reconfigured E-DPCCH/DPCCH;

the RNC reconfigures the power offset of the E-DPCCH/DPCCH in the following two ways:

one method is that the power offset of the E-DPCCH/DPCCH can be reconfigured when the RNC reconfigures the power offset of the additional E-DPDCH/DPCCH directly according to the change of the power offset of the E-DPDCH/DPCCH.

Another method is that the RNC can reconfigure the E-DPCCH/DPCCH power offset according to the E-DPCCH reception quality assistance information provided by the Node B, independently of whether the additional E-DPDCH/DPCCH power offset changes.

804: the RNC transmits the reconfigured E-DPCCH/DPCCH power offset to the UE;

805: RNC transmits the reconfigured E-DPCCH/DPCCH power offset to Node B;

806: the UE calculates E-DPCCH transmission power according to the power offset of the E-DPCCH/DPCCH and transmits the E-DPCCH.

Operation of the RNC:

firstly, RNC sets the initial value of the power offset of E-DPCCH/DPCCH and transmits the initial value to UE and Node B;

the E-DPCCH is composed of fields of an E-DCH transport format (E-TF), a Received Sequence Number (RSN), scheduling information and the like, and different fields can set different power offsets relative to the DPCCH because the performance requirements and the coding modes of the fields can be different.

Then, the RNC calculates the power offset of the reconfigured E-DPCCH/DPCCH;

different fields of the E-DPCCH may be reconfigured with different power offsets relative to the DPCCH when reconfigured.

The RNC resets the power offset of E-DPCCH/DPCCH, and the first method can be directly based on the change of the power offset of E-DPDCH/DPCCH. Since the decoding result of the E-DPDCH depends on the E-DCH transmission format (E-TF), the Receiving Sequence Number (RSN) and other information carried in the E-DPCCH, the receiving quality of the E-DPDCH also depends on the receiving quality of the E-DPCCH. In order to guarantee the reception quality of the E-DPCCH, the RNC may reset the power offset of the E-DPCCH/DPCCH when the additional E-DPDCH/DPCCH power offset changes.

The RNC resets the power offset of E-DPCCH/DPCCH, and the second method can receive the quality auxiliary information according to the E-DPCCH provided by the Node B.

RNC transmits the reconfigured E-DPCCH/DPCCH power offset to UE and Node B;

operation of Node B:

if the RNC reconfigures the power offset of E-DPCCH/DPCCH by adopting the first method, namely directly according to the change of the power offset of E-DPDCH, the Node B only needs to receive the corresponding information sent by the UE and the RNC.

If the RNC reconfigures the power offset of the E-DPCCH/DPCCH by adopting a second method, namely, the RNC reconfigures the power offset of the E-DPCCH/DPCCH according to the E-DPCCH receiving quality auxiliary information provided by the Node B. In this case, the Node B needs to estimate the quality of E-DPCCH and report the result to the RNC, in addition to receiving the corresponding information sent by the UE and the RNC.

Operation of the UE:

Three examples of the invention are given below.

The first embodiment is as follows: embodiment of method for controlling outer loop power of uplink data channel in E-DCH

The Node B measures the uplink receiving quality and reports the uplink receiving quality to the RNC, the uplink receiving quality comprises DCH uplink receiving quality and E-DCH uplink receiving quality, the uplink receiving quality comprises DCH and E-DCH error block rate, namely CRC check results and DCH and E-DCH transmission channel error bit rates, and the E-DCH data transmission times can also be reported to the RNC.

The RNC sets a target signal-to-interference ratio (SIR target) of outer loop power control according to the uplink receiving quality of the DCH transmission channel, the SIR target is reduced when the uplink receiving quality of the DCH is higher than a target value, the SIR target is increased when the uplink receiving quality of the DCH is lower than the target value, and then the RNC transmits the SIR target value to the Node B through NBAP signaling, and the process is the same as the process in Rel 99.

The RNC sets an additional E-DPDCH/DPCCH power offset (additional E-DPDCH/DPCCH power offset) according to the QoS of the E-DCH and the uplink receiving quality. The specific operation is shown in fig. 5.

The parameters used in fig. 5 will be explained first:

SIR _ target _ e: SIR target of E-DCH transmission channel;

SIR _ target _ d: SIR target of DCH transmission channel;

delta _ pre: the difference between the SIR target of the previous E-DCH transmission channel and the DCH transmission channel is set by the network as the initial value;

delta _ cur: the difference between the SIR target of the current E-DCH transmission channel and the DCH transmission channel;

APO: additional E-DPDCH/DPCCH power offset (additional E-DPDCH/DPCCH poweroffset) with the unit of dB;

step _ size: step size of APO increase or decrease.

According to step 501 in FIG. 5: the RNC sets the initial values of delta _ pre, APO, step _ size.

For example: delta _ pre is 0, APO OdB, step size 0.1 dB.

According to step 502 in FIG. 5: the RNC calculates the SIR target, i.e. SIR _ target _ E and SIR _ target _ d, of each of the E-DCH and DCH according to the uplink reception quality reported by the Node B and the QoS of the E-DCH and DCH, the method is the same as Rel99, and is described in the foregoing description of 201.

According to step 503 in FIG. 5: the RNC calculates the difference delta cur between the SIR target of the current E-DCH transport channel and the DCH transport channel,

delta_cur＝SIR_target_e-SIR_target_d。

according to step 504 in FIG. 5: and the RNC compares whether the difference between the current E-DCH transport channel and the DCH transport channel SIRtarget is larger than the difference between the previous E-DCH transport channel and the DCH transport channel SIRtarget.

If the comparison result is greater than the predetermined value, step 505 is executed: the additional E-DPDCH/DPCCH power offset APO increases by one step size,

if the comparison result is less than the predetermined value, step 506 is executed: the additional E-DPDCH/DPCCH power offset APO is reduced by one step size.

And then setting the difference between the current E-DCH transmission channel and the DCH transmission channel SIR target as the difference between the previous E-DCH transmission channel and the DCH transmission channel SIR target.

Finally, returning to step 502, the next calculation process is performed.

The RNC transmits an additional E-DPDCH/DPCCH power offset (additional E-DPDCH/DPCCHPower offset) to the UE and the Node B;

and the UE determines the transmission power of the uplink E-DPDCH according to the E-DPDCH/DPCCH power offset and an additional E-DPDCH/DPCCH power offset in the Rel 99. The specific operation is shown in fig. 6.

The ratio of E-DPDCH to DPCCH power depends not only on the transport format used but also on 602 the additional E-DPDCH/DPCCH power offset APO. The gain factor related to 603 transport formats and 602 additional E-DPDCH/DPCCH power offset APO is noted as 604 β_EU，

β_EU＝f(APO，E_TF)；

Similar to the calculation of the DPDCH to DPCCH power ratio in Rel99, the E-DPDCH to DPCCH power ratio is related to the transport format used, and the E-DPDCH/DPCCH gain factor related to the transport format is denoted as beta_EU2，

β_EU2＝g(E_TF)；

The gain factor of E-DPDCH/DPCCH related to the additional E-DPDCH/DPCCH power offset APO is recorded as beta_EU1，

Then

β_EU＝β_c·β_EU1·β_EU2

Wherein, beta_cIs the gain factor of the DPCCH.

β_EU/β_cIs the power ratio of E-DPDCH/DPCCH, the power of DPCCH is changed by the action of fast power control, and the power of E-DPDCH can be calculated according to the power of DPCCH and the power ratio of E-DPDCH/DPCCH.

Example two: in the embodiment of the method for controlling the outer ring power of the uplink control channel in the E-DCH, the RNC sets the initial value of the power offset of the E-DPCCH/DPCCH and transmits the initial value to the UE and the Node B. The RNC reconfigures the power offset of the E-DPCCH/DPCCH.

The RNC resets the power offset of the E-DPCCH/DPCCH, and can change the power offset of the E-DPDCH/DPCCH according to the change of the power offset of the E-DPCCH/DPCCH. When the power offset of the additional E-DPDCH/DPCCH is increased, the power offset of the E-DPCCH/DPCCH is also increased; when the power offset of the additional E-DPDCH/DPCCH is reduced, the power offset of the E-DPCCH/DPCCH is kept unchanged or reduced. In order to ensure the quality of the E-DPCCH, the power offset of the E-DPCCH/DPCCH is decreased at a lower rate than the increased rate. The method is simple to adjust the power offset of the E-DPCCH/DPCCH, and does not need the Node B to estimate and report the quality of the E-DPCCH.

In order to enable the RNC to accurately set the power offset of the E-DPCCH/DPCCH, when the RNC resets the power offset of the E-DPCCH/DPCCH, the auxiliary information of the E-DPCCH receiving quality provided by the Node B can also be used. When the RNC finds that the quality of the E-DPCCH is lower than a set threshold value, the power offset of the E-DPCCH/DPCCH is increased, and therefore the receiving quality of the E-DPCCH is enhanced.

RNC transmits the reconfigured E-DPCCH/DPCCH power offset to UE and Node B; finally, the UE calculates E-DPCCH transmission power according to the power offset of the E-DPCCH/DPCCH, and transmits the E-DPCCH.

Example three: embodiment of method for controlling outer loop power of uplink data channel in E-DCH when E-DCH bears multiple QoS data

From the MAC layer, when the E-DCH channel carries multiple QoS, data of different QoS may be respectively carried in different MAC _ d flows, and the multiple MAC _ d flows may be mapped into one MAC _ E PDU. Therefore, in one TTI, the E-DCH can carry only the data of the QoS1, only the data of the QoS2, and simultaneously the data of the QoS1 and the QoS 2.

In this case, the uplink data channel outer loop power control in E-DCH can be performed as follows: the Node B measures the uplink receiving quality and reports the uplink receiving quality to the RNC, wherein the uplink receiving quality comprises DCH uplink receiving quality and the uplink receiving quality of QoSi (i is 1, 2, …, N; N is the maximum number of QoS which can be carried by the E-DCH) data in the E-DCH, and the uplink receiving quality can comprise DCH and E-DCH block error rates, namely CRC checking results, DCH and E-DCH transmission channel bit error rates and the transmission times of each QoS data in the E-DCH.

The RNC sets a target signal-to-noise ratio (SIR target) of the DPCCH of the outer loop power control according to the uplink receiving quality of the DCH transmission channel, when the uplink receiving quality of the DCH is higher than the target value, the SIR target is reduced, when the uplink receiving quality of the DCH is lower than the target value, the SIR target is increased, then the RNC transmits the SIR target value to the Node B through NBAP signaling, and the process is the same as the process in Rel 99.

The RNC sets an additional E-DPDCH/DPCCH power offset (additional E-DPDCH/DPCCH Down offset) for each QoS of the E-DCH according to the requirements of various QoS of the E-DCH, the requirements of the QoS of the DCH and the uplink receiving quality of the DCH, and the additional E-DPDCH/DPCCH Down offset is recorded as: and APO _ QoSi (i is 1, 2, …, N; N is the maximum number of QoS which can be carried by the E-DCH), wherein the APO _ QoSi corresponds to an additional E-DPDCH/DPCCH power offset of the QoSi in the E-DCH, and the additional E-DPDCH/DPCCH power offset is common to all E-TF. For generating APO _ QoSi, referring to the first embodiment, SIR _ target _ E and APO in an algorithm of "the RNC sets an additional E-DPDCH/DPCCH power offset according to QoS and uplink reception quality of the E-DCH and the DCH" may be replaced with SIR _ target _ E _ QoSi and APO _ QoSi. Wherein, SIR _ target _ E _ QoSi is SIR target corresponding to QoSi in E-DCH.

And the RNC transmits the additional E-DPDCH/DPCCH power offset APO _ QoSi (i is 1, 2, …, N; N is the maximum number of QoS which can be carried by the E-DCH) corresponding to each QoS to the UE and the Node B.

And the UE determines the transmission power of the uplink E-DPDCH according to the E-DPDCH/DPCCH power offset in the Rel99 and an additional E-DPDCH/DPCCH power offset (additional E-DPDCH/DPCCH power offset) corresponding to each QoS of the E-DCH.

If the current TTI, E-DCH only carries QoSi (i ═ 1, 2, …, N; N is the maximum number of QoS that E-DCH can carry)

β_EU＝β_c·β_EUI·β_EU2，

Wherein,

β_EU2is a gain factor corresponding to E-TF one by one, and can be recorded as beta_EU2(E _ TF). Beta corresponding to each E-TF in the E-TFS can be obtained through higher layer signaling_EU2(ii) a The beta corresponding to each E-TF can also be obtained by calculation_EU2At this time, it is necessary to know the reference E-TF and the reference beta corresponding thereto_EU2Reference E-TF and reference beta corresponding thereto_EU2Is transmitted through higher layer signaling. For the above method for calculating the power offset of E-DPDCH/DPCCH, Table 1 lists the calculation of the power offset of E-DPDCH/DPCCH when the E-DCH carries two kinds of QoS data at most and there are 5E-TFs. The method can be extended to the case that N (N is an integer greater than or equal to 1) kinds of QoS data are carried in the E-DCH at most, and M (M is an integer greater than or equal to 1) E-TFSs are provided.

If the current TTI and E-DCH bear data of a plurality of QoS, the additional E-DPDCH/DPCCH power offset APO is the maximum value of the additional E-DPDCH/DPCCH power offset corresponding to the QoS, and beta_EU＝β_c·β_EU1·β_EU2，

Wherein,

β_EU2is a gain factor related to E-TF and can be denoted as beta_EU2(E _ TF). Beta corresponding to each E-TF in the E-TFS can be obtained through higher layer signaling_EU2(ii) a The beta corresponding to each E-TF can also be obtained by calculation_EU2At this time, it is necessary to know the reference E-TF and the reference beta corresponding thereto_EU2Reference E-TF and reference beta corresponding thereto_EU2Is transmitted through higher layer signaling.

Claims

1. A method for controlling outer loop power of an uplink enhanced dedicated channel (E-DCH), comprising the steps of:

a base station (Node B) measures uplink reception quality and reports it to a Radio Network Controller (RNC);

RNC sets the target signal-to-noise ratio of outer ring power control according to the uplink receiving quality of the Dedicated Channel (DCH) transmission channel;

RNC transmits the target signal-to-noise ratio to Node B;

the RNC sets an additional enhanced dedicated physical data channel/dedicated physical control channel (E-DPDCH/DPCCH) power offset according to the quality of service (QoS) and the uplink receiving quality of the E-DCH and the DCH;

the RNC transmits the additional E-DPDCH/DPCCH power offset to User Equipment (UE);

RNC transmits the power offset of the additional E-DPDCH/DPCCH to Node B;

and the UE determines the transmission power of an uplink enhanced dedicated physical data channel (E-DPDCH) according to the E-DPDCH/DPCCH power offset and the additional E-DPDCH/DPCCH power offset in the Rel99 and transmits the E-DCH data.

2. The method of claim 1 wherein the E-DPDCH/DPCCH power offset in Rel99 is a one-to-one E-DPDCH/DPCCH power offset corresponding to an E-DCH transport format (E-TF).

3. The method of claim 1 wherein the additional E-DPDCH/DPCCH power offset is an additional E-DPDCH/DPCCH power offset common to all E-TFs independent of E-DCH transport format (E-TF).

4. Method according to claim 1, characterized in that the E-DPDCH/DPCCH power offset β_EUThe calculation of (c) may utilize the following formula:

β_EU＝β_c·β_EU1·β_EU2；

wherein, beta_cIs the gain factor, beta, of a Dedicated Physical Control Channel (DPCCH)_EU1Is an E-DPDCH/DPCCH gain factor, β, related to the additional E-DPDCH/DPCCH power offset (APO)_EU2Is an E-DPDCH/DPCCH gain factor corresponding one-to-one to the transport format.

5. The method of claim 4, wherein β EU1 is calculated by the following equation:

where APO is the additional E-DPDCH/DPCCH power offset.

6. The method of claim 1, wherein when the E-DCH can carry multiple QoS data, the RNC can set an additional E-DPDCH/DPCCH power offset for different QoS data carried by the E-DCH.

7. The method of claim 1, wherein when the E-DCH can carry multiple QoS data, the UE determines the transmit power of the uplink E-DPDCH according to the power offset of the E-DPDCH/DPCCH in Rel99 and the power offset of the additional E-DPDCH/DPCCH corresponding to each QoS of the E-DCH.

8. The method of claim 7, wherein:

if the current TTI, E-DCH carries only data of QoSi, where i is 1, 2.

9. The method of claim 7, wherein:

if the E-DCH carries data of a plurality of QoS in the current Transmission Time Interval (TTI), the additional E-DPDCH/DPCCH power offset (APO) is the maximum value of the additional E-DPDCH/DPCCH power offsets corresponding to the QoS.

10. The method of claim 1 wherein the RNC communicating the additional E-DPDCH/DPCCH power offset to the UE and Node B is periodic.

11. The method of claim 1 wherein the RNC communicating the additional E-DPDCH/DPCCH power offset to the UE and Node B is event triggered.

12. The method of claim 1 wherein the RNC transmits an additional E-DPDCH/DPCCH power offset to a Node B, and in case of soft handover, to a scheduling Node B and a non-scheduling Node B.

13. The method of claim 1 wherein the RNC transmits the additional E-DPDCH/DPCCH power offset to the Node B and, in the case of soft handover, only to the scheduling Node B.

14. The method of claim 1 wherein the RNC communicating the additional E-DPDCH/DPCCH power offset to the UE is transmitted via Radio Resource Control (RRC) signaling.

15. The method of claim 1 wherein the RNC communicating the additional E-DPDCH/DPCCH power offset to the Node B is via base station application part (NBAP) signaling.

16. The method of claim 1 wherein the RNC communicating the additional E-DPDCH/DPCCH power offset to the Node B is transmitted via a user plane Frame Protocol (FP).

17. The method of claim 1 wherein the RNC communicating the additional E-DPDCH/DPCCH power offset to the Node B is transmitted via a control frame of the user plane.

18. The method according to claim 1, characterized in that the uplink reception quality comprises a DCH uplink reception quality and an E-DCH uplink reception quality.