CN101868020A - Method and device for controlling user equipment transmitting power in universal mobile telecommunication system - Google Patents

Method and device for controlling user equipment transmitting power in universal mobile telecommunication system Download PDF

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Publication number
CN101868020A
CN101868020A CN201010169848A CN201010169848A CN101868020A CN 101868020 A CN101868020 A CN 101868020A CN 201010169848 A CN201010169848 A CN 201010169848A CN 201010169848 A CN201010169848 A CN 201010169848A CN 101868020 A CN101868020 A CN 101868020A
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cell
transmitting power
current service
base station
information
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张家宝
邓云
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ZTE Corp
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ZTE Corp
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Priority to CN201010169848A priority Critical patent/CN101868020A/en
Priority to PCT/CN2010/075846 priority patent/WO2011140749A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/146—Uplink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/16—Deriving transmission power values from another channel

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a method for controlling user equipment transmitting power in a universal mobile telecommunication system (UMTS). The method comprises the following steps that: after a user equipment (UE) obtains the system message of the adjacent cell of the current serving cell and when the communication with a base station to which the current cell belongs needs to be recovered, the transmitting power is adjusted according to the signal message of the current serving cell or the transmit power control (TPC) of a dedicated physical control channel (DPCCH) and the UE adopts the adjusted transmitting power to send messages to the base station to which the current cell belongs. The invention also discloses a device for controlling the UE transmitting power in the UMTS. The method and the device can avoid the reduction of system capacity caused by improper transmitting power.

Description

Method and device for controlling user equipment transmitting power in universal mobile communication system
Technical Field
The present invention relates to a Universal Mobile Telecommunications System (UMTS) technology, and more particularly, to a method and an apparatus for controlling a User Equipment (UE) transmission power in a UMTS.
Background
With the development of wireless network construction technology, indoor coverage has become an important implementation of wireless network construction technology. The reasonable indoor coverage scheme can not only enable the network system to play a role to the greatest extent, further create greater value for operators, but also greatly save the cost of the operators for building the network, and further really realize low investment and high return. Therefore, the wireless access equipment of the home base station is generated. The home base station is deployed in a private place such as a home, a company, or a school as a dedicated resource of a private user, and can provide various high-speed wireless access services to the user and also provide a premium benefit. At present, there are three access modes of the femtocell, which are respectively: the cells under the corresponding coverage are respectively called as an open mode femtocell cell, a closed mode femtocell cell and a mixed mode femtocell cell. The femtocell cell in the Closed mode only allows authorized users to access, the authorized users form a Closed Subscriber Group (CSG), and the femtocell cell in the Closed mode may be referred to as a CSG cell for short; the Hybrid mode femtocell allows unauthorized user access in addition to authorized user access, but the authorized user has priority guarantee of service quality, priority allocation of resources and privilege of charges, and the Hybrid mode femtocell is simply referred to as a Hybrid (Hybrid) cell.
Since the authorized user enjoys the priority guarantee right of the service quality, the priority distribution right on the resource and the preferential right on the charge when the authorized user is in the corresponding CSG cell or the Hybrid cell, when the user enters the corresponding CSG cell or the Hybrid cell, the user needs to switch from the adjacent macro base station cell to the corresponding CSG cell or the Hybrid cell, thereby using the resource of the CSG cell or the Hybrid cell. In the switching process, the UE needs to acquire the system message of the CSG cell or the Hybrid cell, and at the moment, the UE interrupts the communication with the macro base station cell; after acquiring the system message of the CSG cell or the Hybrid cell, the UE sends the initial access control information to the network side, so that the UE needs to resume communication with the macro base station cell, send the initial access control information to the macro base station cell, and receive the initial access control information by forwarding of the macro base station cell, thereby implementing handover.
In addition to the above, when the UE acquires the system message of the neighboring macro cell under the permission of the network side, it is also necessary to interrupt the communication with the current serving cell; after the system message of the adjacent macro cell is acquired, the UE needs to send the acquired information to the network side, and at this time, the UE also needs to resume communication with the current serving cell, send the acquired information to the current serving cell, and the network side receives the acquired information through forwarding of the base station of the current serving cell.
Since UMTS is an interference limited system, its system capacity is mainly limited by the interference between UEs and base stations in the system, that is, when the signal of each UE reaches the base station, the minimum signal-to-noise ratio required to ensure the communication quality can be achieved, the capacity of UMTS will be maximized, so that when each UE transmits information to the base station, the transmitted power needs to be controlled to ensure the capacity of UMTS. In other words, the higher the transmit power, the lower the capacity of the UMTS, while ensuring that the signal is clear.
However, in the existing UMTS protocol, there is no technical solution for controlling the transmission power when the UE resumes communication with the base station of the current serving cell.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a method and an apparatus for controlling UE transmission power in UMTS, where after the UE acquires the system message of the cell adjacent to the current serving cell, and when it needs to resume the communication with the base station of the current serving cell, the UE can control the transmission power, thereby ensuring the capacity of the UMTS.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the invention provides a method for controlling UE transmitting power in UMTS, which comprises:
after the UE acquires the system information of the cell adjacent to the current serving cell and needs to resume communication with the base station to which the current serving cell belongs, the UE adjusts the transmit Power according to the signal information of the current serving cell or the Transmit Power Control (TPC) in a Dedicated Physical Control Channel (DPCCH);
and the UE sends information to the base station to which the current service cell belongs by adopting the adjusted transmitting power.
In the foregoing scheme, the adjusting the transmission power specifically includes: and the UE adjusts the transmitting power according to the signal quality of the current service cell before and after the system information of the cell adjacent to the current service cell is acquired.
In the foregoing scheme, the adjusting the transmission power specifically includes: and the UE acquires the transmitting power of the information which is sent to the base station of the current service cell before the system information of the cell adjacent to the current service cell is acquired, and the transmitting power is used as the transmitting power when the UE resumes the communication with the base station of the current service cell.
In the foregoing scheme, the adjusting the transmission power specifically includes: and the UE adjusts the transmitting power according to the TPC in the DPCCH which is received recently before the system message of the cell adjacent to the current service cell is acquired.
In the foregoing scheme, the adjusting the transmission power specifically includes:
and the UE adjusts the transmitting power according to the function of the signal quality difference of the current service cell before and after the system information of the cell adjacent to the current service cell is acquired.
In the above scheme, the current serving cell is an active set, and the adjusting the transmission power specifically includes:
and the UE adjusts the transmitting power according to the signal quality of the cell with the best signal quality in the front and back active set of the system information of the cell adjacent to the current service cell.
In the above scheme, the current serving cell is an active set, and the adjusting the transmission power specifically includes:
and the UE adjusts the transmitting power according to the function of the difference of the signal quality sum of all or part of the cells in the front and back active set of the system information of the cell adjacent to the current service cell.
In the foregoing solution, when the cell adjacent to the current serving cell is a Closed Subscriber Group (CSG) cell or a Hybrid (Hybrid) cell, the UE acquires a system message of the cell adjacent to the current serving cell, specifically:
the UE determines to approach the CSG cell or the Hybrid cell according to the stored fingerprint (fingerprint) information, and reports an entering approach indication to a network side;
after receiving the approach indication, the network side sends a measurement configuration signaling about the frequency of the CSG cell or the Hybrid cell to the UE;
the UE measures the cells meeting the measurement event on the frequency of the CSG cell or the Hybrid cell according to the signaling, and reports the primary scrambling code identifier (PSC) and the signal quality of each cell meeting the measurement event to a network side after measurement;
after receiving the reported PSC of each cell meeting the measurement event, the network side determines the CSG cell or the Hybrid cell according to the PSC;
the network side sends a signaling for acquiring the system message of the CSG cell or the Hybrid cell to the UE;
and the UE establishes a measurement gap and acquires the system message of the CSG cell or the Hybrid cell.
The invention also provides a device for controlling the UE transmitting power in the UMTS, which comprises: the device comprises an adjusting module and a transmitting module; wherein,
the adjusting module is used for adjusting the transmitting power according to the signal information of the current service cell or TPC in DPCCH and sending the adjusted transmitting power to the sending module after the UE acquires the system information of the cell adjacent to the current service cell and when the UE needs to resume the communication with the base station to which the current service cell belongs;
and the transmitting module is used for transmitting information to the base station to which the current service cell belongs according to the adjusted transmitting power transmitted by the adjusting module.
In the foregoing solution, the adjusting module is specifically configured to:
adjusting the transmitting power according to the signal quality of the current service cell before and after the system information of the cell adjacent to the current service cell is acquired, and transmitting the adjusted transmitting power to a transmitting module; or,
adjusting the transmitting power according to the TPC in the DPCCH which is received recently before the system message of the cell adjacent to the current service cell is acquired, and sending the adjusted transmitting power to a sending module; or,
and obtaining the transmitting power of the information which is sent to the base station of the current service cell before the system information of the cell adjacent to the current service cell is obtained, and sending the obtained transmitting power to a sending module.
The method and the device for controlling the UE transmitting power in the UMTS provided by the invention can adjust the transmitting power and adopt the adjusted transmitting power to send information to the base station to which the current service cell belongs after the UE acquires the system information of the cell adjacent to the current service cell and needs to recover the communication with the base station to which the current service cell belongs, thereby avoiding the reduction of the system capacity caused by improper transmitting power.
In addition, the UE can adjust the transmitting power according to the function of the signal quality difference value of the cell with the best signal quality in the activation set before and after the system information of the cell adjacent to the current service cell is acquired; or, the transmitting power is adjusted according to the function of the difference value of the signal quality sum of all or part of the cells in the active set before and after the system information of the cell adjacent to the current service cell is acquired, so that when the UE is in a soft handover state, the signals of the cells in the active set can be comprehensively activated, the transmitting power can be better adjusted, and the capacity of the UMTS can be further ensured.
Drawings
FIG. 1 is a flowchart illustrating a method for controlling UE transmission power in UMTS, in accordance with the present invention;
FIG. 2 is a flowchart illustrating a method for controlling UE transmit power according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating a radio frame format of a typical UMTS downlink physical channel in the prior art;
FIG. 4 is a flowchart illustrating a method for controlling UE transmit power according to a second embodiment of the present invention;
FIG. 5 is a diagram illustrating an apparatus for controlling UE transmit power in UMTS, in accordance with the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The method for controlling UE transmitting power in UMTS of the invention, as shown in figure 1, includes the following steps:
step 101: after the UE acquires the system information of the cell adjacent to the current serving cell and when the communication with the base station to which the current serving cell belongs needs to be restored, the UE adjusts the transmitting power according to the signal information of the current serving cell or the TPC in the DPCCH;
specifically, the specific implementation of the UE to adjust the transmission power may be as follows:
the transmitting power can be adjusted according to the signal quality of the current service cell before and after the system information of the cell adjacent to the current service cell is obtained; or,
the transmitting power of the information which is sent to the base station of the current service cell before the system information of the cell adjacent to the current service cell is obtained can be used as the transmitting power when the UE recovers the communication with the base station to which the current service cell belongs; or,
the transmission power can also be adjusted according to the TPC in the DPCCH received recently before the system message of the cell adjacent to the current service cell is acquired.
Step 102: and the UE sends information to the base station to which the current service cell belongs by adopting the adjusted transmitting power.
In practical application, the UE can select one of the three ways to adjust the transmission power.
The first embodiment is as follows:
the scene description of the present embodiment is: the UE is located in a macro cell 1 governed by a macro base station, and is in a connection state with the macro base station to which the cell 1 belongs, the cell 1 is called a current serving cell, and at this time, a Radio Network Controller (RNC) to which the macro base station belongs is called a source RNC; the home base station cells adjacent to cell 1 are cell 2, cell 3, and cell 4.
The method for controlling UE transmission power in this embodiment, as shown in fig. 2, includes the following steps:
step 201: at a certain moment, the UE determines to approach a certain CSG cell or Hybrid cell which is accessed and authorized before according to the stored fingerprint (fingerprint) information, and then reports an entering approach indication to the source RNC;
here, after accessing the authorized CSG cell or Hybrid cell, the UE stores fingerprint (fingerprint) information of the CSG cell or Hybrid cell, where the fingerprint information may include: primary Scrambling Code (PSC), CSG ID, Global Cell Identifier (CGI), frequency (f1), address, access network technology, and neighbor Cell information of the CSG Cell or Hybrid Cell; the UE can automatically detect the CSG cell or the Hybrid cell which is close to a certain previously accessed and authorized according to the stored fingerprint information;
the incoming proximity indication includes: frequency (f1) of the CSG cell or Hybrid cell and access network technology; the Access network technology may be Universal Terrestrial Radio Access (UTRAN) or evolved UTRAN (E-UTRAN).
Step 202: after receiving the approach indication, the source RNC sends measurement configuration signaling about f1 to the UE;
here, after receiving the proximity indication, if the UE is not configured with the measurement configuration of f1, the source RNC sends measurement configuration signaling about f1 to the UE; if the measurement configuration about f1 has been sent and the measurement report of f1 has been obtained, sending a signaling for acquiring a system message of a designated cell to the UE through a Radio Resource Control (RRC) layer, and then executing steps 205-207;
the measurement configuration signaling for f1 includes: measuring gaps, the range of the CSG cell or the PSC of the Hybrid cell to be measured, and measuring events; the UE knows the time of communication interruption with the macro base station in the process of acquiring the CSG cell or Hybrid cell system message according to the measurement gap, measures the femtocell cell within the PSC range according to the PSC range of the CSG cell or Hybrid cell to be measured, and can find the adjacent cell of the cell 1 meeting the measurement event on f1 according to the measurement event;
the source RNC can know the range of the PSC of the CSG cell, or Hybrid cell according to f 1;
the UMTS protocol specifies: the source RNC must send the range of the PSC of the CSG cell or Hybrid cell that needs to be measured to the UE, otherwise, the UE does not measure the CSG cell or Hybrid cell according to the measurement event during the measurement.
Step 203: after receiving the configuration signaling, the UE measures the cells meeting the measurement event on the f1 according to the configuration signaling, and reports the PSC and the signal quality of each cell meeting the measurement event to the source RNC after measurement;
here, it is assumed that cells satisfying the measurement event include: cell 2, cell 3, and cell 4; wherein only the PSC of the cell 2 is within the range of the PSC of the CSG cell or Hybrid cell to be measured;
the source RNC knows the signal strength of each cell according to the signal quality of each cell.
Step 204: after receiving the reported PSC of each cell meeting the measurement event, the source RNC determines that the cell 2 is the CSG cell or the Hybrid cell according to the PSC range of the CSG cell or the Hybrid cell to be measured, and sends a signaling for acquiring a system message of the cell 2 to the UE through an RRC layer;
here, the signaling for acquiring the system message of the cell 2 may include: the UE acquires the start and end times of the system message of cell 2.
Step 205: after receiving the signaling for acquiring the system message of the cell 2, the UE creates a measurement gap, acquires the system message of the cell 2, and then executes step 206;
here, when the UE receives the signaling for acquiring the system message of cell 2, it measures that the signal quality of cell 1 is a1, and at this time, the transmission power of the UE is P1; the measured signal quality can be the received power of a common pilot channel and has the unit of dBm, and can also be Ec/No of the common pilot channel and has the unit of dB, wherein the Ec/No represents the quality condition of the signal after descrambling and before despreading, the Ec represents the energy of a chip, and the No represents the broadband thermal noise;
if the signaling for acquiring the system message of the cell 2 does not include: the UE acquires the starting time and the ending time of the system message of the cell 2, and the UE automatically establishes the measurement gap by adopting the default time, for example, the protocol specifies that the time for acquiring the system message by the UE is 150 milliseconds, and the time for establishing the measurement gap by the UE is 150 milliseconds, wherein the starting time is when the UE receives a signaling for acquiring the system message of the cell 2; if the signaling for acquiring the system message of the cell 2 includes: UE obtains the starting time and the ending time of the system message of the cell 2, and the UE creates a measurement gap according to the starting time and the ending time in the signaling;
the UE acquires a system message of the cell 2, specifically:
reading the CSG ID and the CGI in a system message block 3 or 4 of the cell 2;
after the UE establishes the measurement gap, the UE actively interrupts the communication with the macro base station to which the cell 1 belongs;
in step 201-205, the information interaction between the UE and the source RNC needs to be forwarded through the macro base station to which the cell 1 belongs.
Step 206: after obtaining the system information of the cell 2, the UE adjusts the transmitting power, and sends initial access control information to a macro base station to which the cell 1 belongs by adopting the adjusted transmitting power;
here, after acquiring the system message of the cell 2, when it is necessary to send initial access control information to the macro base station to which the cell 1 belongs, the UE measures the signal quality of the cell 1 as a 2; the UE compares A1 with A2, if A2 is more than A1, the UE transmits the initial access control information by using the transmission power which is reduced by one step compared with P1; if A2 is less than A1, the UE transmits the initial access control information by adopting the transmission power which is increased by one step compared with P1; if a2 is a1, the UE may transmit the initial access control information using P1, may also transmit the initial access control information using transmission power that is one step lower than P1, or may also transmit the initial access control information using transmission power that is one step higher than P1;
the step size can adopt the step size specified by the UMTS protocol;
the purpose of sending the initial access control information to the macro base station to which the cell 1 belongs by the UE is: the source RNC receives initial access control information.
Step 207: the source RNC receives the initial access control information, implements a switching decision according to the initial access control information and ends the current processing flow;
specifically, the source RNC sends a handover signaling to the base station to which the cell 2 belongs, and switches the connection between the UE and the macro base station to the connection with the home base station to which the cell 2 belongs.
It is seen from this embodiment that, after acquiring the system message of the cell 2, the adjustment of the transmission power when sending the initial access control information to the macro base station to which the cell 1 belongs depends on the difference of the signal qualities of the current serving cells before and after acquiring the system message of the CSG cell or the Hybrid cell, and in practical applications, the adjustment value of the transmission power may also be a function of the difference of the signal qualities of the current serving cells before and after acquiring the system message of the CSG cell or the Hybrid cell, for example: the function can be different adjustment step lengths according to the size of the difference value, or can be integer multiples of the step length according to the size of the difference value; for example, one can use: w ═ k × Δ x; wherein, W represents the transmission power, k is a constant, the value of which can be specified in advance in the UMTS protocol, and Δ x represents the difference of the signal quality of the current serving cell; the function may be all functions according to the inventive solution with the difference in signal quality of the current serving cell as a variable.
In this embodiment, after the UE acquires the system message of the cell 2, the UE may also directly send the initial access control information to the macro base station to which the cell 1 belongs, by using the transmission power P1 of the UE when the UE receives the signaling for acquiring the system message of the cell 2;
after the UE acquires the system message of the cell 2, the UE may also adjust the transmit power according to the TPC command in the DPCCH received last time when the UE receives the signaling for acquiring the system message of the cell 2, in other words, adjust the transmit power according to the TPC command in the DPCCH received last time. Specifically, fig. 3 is a schematic diagram of a format of a radio frame typical of a UMTS Downlink Physical Channel (DPCH) in the prior art, and as can be seen from fig. 3, a radio frame includes 15 slots, and each slot in the radio frame includes a plurality of DPDCHs and a plurality of Dedicated Physical Control Channels (DPCCHs). The DPCCH is a downlink channel for carrying control information generated at the physical layer. DPCCH including TPC, transport format combinationA Transport Format Combination Indicator (TFCI), a pilot. Including N in TPC per slotTPCA bit. If N is presentTPCThe UE adopts the transmitting power which is increased by one step length compared with P1 to send the initial access control information as 1; if N is presentTPCAt 0, the UE transmits the initial access control information with a transmission power decreased by one step from P1.
Example two:
the application scenario of this embodiment is: the UE is located in a macro cell 1 under the control of a macro base station and is in a connection state with the macro base station to which the cell 1 belongs, and at the moment, an RNC to which the macro base station belongs is called a source RNC; the femtocell cells adjacent to the cell 1 include a cell 2, a cell 3, a cell 4, a cell 5, and a cell 6; the frequencies of the cell 2 and the cell 3 are the same as the frequency of the cell 1, and because there is a neighboring cell with the same frequency, the source RNC adds two wireless links corresponding to the cell 2 and the cell 3 to the UE, that is, at this time, the UE is in a soft handover state. Cell 1, cell 2 and cell 3 constitute an active set, and cell 1, cell 2 and cell 3 are all referred to as current serving cells.
The method for controlling UE transmission power in this embodiment, as shown in fig. 4, includes the following steps:
step 401: at a certain moment, the UE determines to approach a certain CSG cell or Hybrid cell which is accessed and authorized before according to the stored fingerprint (fingerprint) information, and then reports an entering approach indication to the source RNC;
the incoming proximity indication includes: frequency (f2) of the CSG cell or Hybrid cell and access network technology; wherein the access network technology may be UTRAN or E-UTRAN.
Step 402: after receiving the approach indication, the source RNC sends measurement configuration signaling about f2 to the UE;
here, the measurement configuration signaling regarding f2 includes: measuring gaps, the range of the CSG cell or the PSC of the Hybrid cell to be measured, and measuring events;
after receiving the proximity indication, if the measurement configuration of f2 is not configured for the UE, the source RNC sends measurement configuration signaling about f2 to the UE; if the measurement configuration about f2 has been transmitted and the measurement report of f2 has been obtained, signaling for acquiring a system message of a specified cell is transmitted to the UE through the RRC layer, and then steps 405 to 407 are performed.
Step 403: after receiving the configuration signaling, the UE measures the cells meeting the measurement event on the f2 according to the configuration signaling, and reports the PSC and the signal quality of each cell meeting the measurement event to the source RNC after measurement;
here, it is assumed that cells satisfying the measurement event include: cell 4, cell 5, and cell 6; wherein only the PSC of the cell 4 is within the range of the PSC of the CSG cell or Hybrid cell to be measured;
the source RNC knows the signal strength of each cell according to the signal quality of each cell.
Step 404: after receiving the reported PSC of each cell meeting the measurement event, the source RNC determines that the cell 4 is the CSG cell or the Hybrid cell according to the PSC range of the CSG cell or the Hybrid cell to be measured, and sends a signaling for acquiring a system message of the cell 4 to the UE through RRC;
here, the signaling of the system message for acquiring the cell 4 may include: the UE acquires the start and end times of the system message of the cell 4.
Step 405: after receiving the signaling for acquiring the system message of the cell 4, the UE creates a measurement gap, acquires the system message of the cell 4, and then executes step 406;
here, when the UE receives the signaling for acquiring the system message of the cell 4, the measured signal qualities of the cell 1, the cell 2, and the cell 3 are a1, a2, and A3, respectively, at this time, a1 is the maximum, and the transmission power of the UE is P1; the measured signal quality can be the received power of a common pilot channel and has the unit of dBm, and can also be Ec/No of the common pilot channel and has the unit of dB, wherein the Ec/No represents the quality condition of the signal after descrambling and before despreading, the Ec represents the energy of a chip, and the No represents the broadband thermal noise;
if the signaling for acquiring the system message of the cell 4 does not include: the UE acquires the starting time and the ending time of the system message of the cell 4, and the UE automatically establishes the measurement gap by adopting the default time, for example, the protocol specifies that the time for acquiring the system message by the UE is 150 milliseconds, and the time for establishing the measurement gap by the UE is 150 milliseconds, wherein the starting time is when the UE receives a signaling for acquiring the system message of the cell 4; if the signaling for acquiring the system message of the cell 4 includes: UE obtains the starting time and the ending time of the system message of the cell 4, and the UE creates a measurement gap according to the starting time and the ending time in the signaling;
the UE acquires a system message of the cell 4, specifically:
reading the CSG ID and the CGI in the system message block 3 or 4 of the cell 4;
after the UE establishes the measurement gap, the UE actively interrupts the communication with the macro base station to which the cell 1, the cell 2 and the cell 3 belong;
in steps 401-405, the information interaction between the UE and the source RNC needs to be forwarded through the macro base station to which the cell 1 belongs.
Step 406: after obtaining the system message of the cell 4, the UE adjusts the transmitting power, and sends initial access control information to the macro base stations of the cell 1, the cell 2 and the cell 3 by adopting the adjusted transmitting power;
here, when the UE needs to send initial access control information to the macro base stations to which cell 1, cell 2, and cell 3 belong after acquiring the system message of cell 4, the measured signal qualities of cell 1, cell 2, and cell 3 are B1, B2, and B3, respectively, where B2 is the largest; at this time, the UE compares a1 and B2, and if B2 > a1, the UE transmits initial access control information with a transmission power decreased by one step from P1; if B2 is less than A1, the UE transmits the initial access control information by using the transmission power which is increased by one step compared with P1; if B2 is a1, the UE may transmit the initial access control information using P1, may transmit the initial access control information using a transmission power that is one step lower than P1, or may transmit the initial access control information using a transmission power that is one step higher than P1;
the size of the step size can be defined in advance, for example: specified by a protocol;
the purpose of sending the initial access control information to the macro base station to which the cell 1, the cell 2 and the cell 3 belong by the UE is as follows: the source RNC receives initial access control information.
Step 407: the source RNC receives the initial access control information, implements a switching decision according to the initial access control information and ends the current processing flow;
specifically, the source RNC sends a handover signaling to the home base station to which the cell 4 belongs, and switches the connection between the UE and the macro base station to the connection with the home base station to which the cell 4 belongs.
It is seen from this embodiment that, after the UE acquires the system message of the cell 4, the adjustment of the transmission power when sending the initial access control information to the macro base station to which the cells 1, 2, and 3 belong depends on the difference of the signal quality of the best current serving cell measured before and after the UE interrupts communication, and in practical applications, the adjustment value of the transmission power may also be a function of the difference of the signal quality of the best current serving cell measured before and after the UE interrupts communication, such as: the function can be different adjustment step lengths according to the size of the difference value, or can be integer multiples of the step length according to the size of the difference value; for example, one can use: w ═ k × Δ x; wherein W represents the transmit power, k is a constant, whose value can be specified in advance in the UMTS protocol, and Δ x represents the difference in measured signal quality of the best current serving cell; the function may be all functions according to the inventive solution with the difference in measured signal quality of the best current serving cell as a variable. In addition, in practical applications, the adjustment value of the transmission power may also be a function of the difference between the sum of all, or part, of the signal qualities of the current serving cell measured before and after the UE interrupts communication, such as: in the second embodiment, the magnitude of the adjustment value of the transmission power may be calculated as a function of the difference between (a1+ a2+ A3) and (B1+ B2+ B3); for example, one can use: w ═ k × Δ x; wherein, W represents the transmission power, k is a constant, the value of which can be specified in advance in the UMTS protocol, and Δ x represents the difference between the measured signal quality sum of all, or part, of the current serving cell; the function may be all functions according to the solution of the present invention, which take the difference of the measured signal quality sum of all or part of the current serving cells as a variable;
when the signal quality of the current service cell is selected as the basis for controlling the transmitting power, the threshold value for regulating the signal quality can be realized in the UMTS protocol, and the selected object can be only used when the signal quality of the current service cell is higher than the threshold value.
The application scenarios in the first embodiment and the second embodiment have the following common features: and the UE acquires the system message of the CSG cell or the Hybrid cell, and sends the initial access control information to the source RNC after acquiring the system message of the CSG cell or the Hybrid cell. In practical application, the UE may also acquire the system message of the neighboring macro cell under the permission of the source RNC, and when the acquired information is sent to the source RNC after the system message of the neighboring macro cell is acquired, the scheme provided by the present invention is also applicable.
In the above scheme, the source RNC may be referred to as the network side.
Based on the above method, the present invention further provides a device for controlling UE transmission power in UMTS, as shown in fig. 5, the device includes: an adjustment module 51 and a transmission module 52; wherein,
an adjusting module 51, configured to, after the UE acquires the system message of the cell adjacent to the current serving cell and when communication with the base station to which the current serving cell belongs needs to be resumed, adjust transmit power according to signal information of the current serving cell or a TPC in a DPCCH, and send the adjusted transmit power to a sending module 52;
a transmitting module 52, configured to send information to the base station to which the current serving cell belongs according to the adjusted transmitting power sent by the adjusting module 51.
The adjusting module 51 is specifically configured to:
adjusting the transmitting power according to the signal quality of the current serving cell before and after the system information of the cell adjacent to the current serving cell is acquired, and sending the adjusted transmitting power to the sending module 52; or,
adjusting the transmitting power according to the TPC command received most recently before the system message of the cell adjacent to the current serving cell is acquired, and sending the adjusted transmitting power to the sending module 52; or,
the transmitting power of the information which is most recently sent to the base station of the current serving cell before the system information of the cell adjacent to the current serving cell is acquired is obtained, and the obtained transmitting power is sent to the sending module 52.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements, etc. that are within the spirit and principle of the present invention should be included in the present invention.

Claims (10)

1. A method for controlling User Equipment (UE) transmit power in a Universal Mobile Telecommunications System (UMTS), the method comprising:
after the UE acquires the system information of the cell adjacent to the current serving cell and when the communication with the base station to which the current serving cell belongs needs to be restored, the UE adjusts the transmitting power according to the signal information of the current serving cell or the Transmission Power Control (TPC) in a Dedicated Physical Control Channel (DPCCH);
and the UE sends information to the base station to which the current service cell belongs by adopting the adjusted transmitting power.
2. The method according to claim 1, wherein the adjusting the transmission power is in particular: and the UE adjusts the transmitting power according to the signal quality of the current service cell before and after the system information of the cell adjacent to the current service cell is acquired.
3. The method according to claim 1, wherein the adjusting the transmission power is in particular: and the UE acquires the transmitting power of the information which is sent to the base station of the current service cell before the system information of the cell adjacent to the current service cell is acquired, and the transmitting power is used as the transmitting power when the UE resumes the communication with the base station of the current service cell.
4. The method according to claim 1, wherein the adjusting the transmission power is in particular: and the UE adjusts the transmitting power according to the TPC in the DPCCH which is received recently before the system message of the cell adjacent to the current service cell is acquired.
5. The method according to claim 2, wherein the adjusting the transmission power is in particular:
and the UE adjusts the transmitting power according to the function of the signal quality difference of the current service cell before and after the system information of the cell adjacent to the current service cell is acquired.
6. The method according to claim 2, wherein the current serving cell is an active set, and the adjusting the transmission power specifically comprises:
and the UE adjusts the transmitting power according to the signal quality of the cell with the best signal quality in the front and back active set of the system information of the cell adjacent to the current service cell.
7. The method according to claim 5, wherein the current serving cell is an active set, and the adjusting the transmission power specifically comprises:
and the UE adjusts the transmitting power according to the function of the difference of the signal quality sum of all or part of the cells in the front and back active set of the system information of the cell adjacent to the current service cell.
8. The method according to any one of claims 1 to 7, wherein when the cell adjacent to the current serving cell is a Closed Subscriber Group (CSG) cell or a Hybrid (Hybrid) cell, the UE acquires a system message of the cell adjacent to the current serving cell, specifically:
the UE determines to approach the CSG cell or the Hybrid cell according to the stored fingerprint (fingerprint) information, and reports an entering approach indication to a network side;
after receiving the approach indication, the network side sends a measurement configuration signaling about the frequency of the CSG cell or the Hybrid cell to the UE;
the UE measures the cells meeting the measurement event on the frequency of the CSG cell or the Hybrid cell according to the signaling, and reports the primary scrambling code identifier (PSC) and the signal quality of each cell meeting the measurement event to a network side after measurement;
after receiving the reported PSC of each cell meeting the measurement event, the network side determines the CSG cell or the Hybrid cell according to the PSC;
the network side sends a signaling for acquiring the system message of the CSG cell or the Hybrid cell to the UE;
and the UE establishes a measurement gap and acquires the system message of the CSG cell or the Hybrid cell.
9. An apparatus for controlling UE transmission power in UMTS, comprising: the device comprises an adjusting module and a transmitting module; wherein,
the adjusting module is used for adjusting the transmitting power according to the signal information of the current service cell or TPC in DPCCH and sending the adjusted transmitting power to the sending module after the UE acquires the system information of the cell adjacent to the current service cell and when the UE needs to resume the communication with the base station to which the current service cell belongs;
and the transmitting module is used for transmitting information to the base station to which the current service cell belongs according to the adjusted transmitting power transmitted by the adjusting module.
10. The apparatus of claim 9, wherein the adjustment module is specifically configured to:
adjusting the transmitting power according to the signal quality of the current service cell before and after the system information of the cell adjacent to the current service cell is acquired, and transmitting the adjusted transmitting power to a transmitting module; or,
adjusting the transmitting power according to the TPC in the DPCCH which is received recently before the system message of the cell adjacent to the current service cell is acquired, and sending the adjusted transmitting power to a sending module; or,
and obtaining the transmitting power of the information which is sent to the base station of the current service cell before the system information of the cell adjacent to the current service cell is obtained, and sending the obtained transmitting power to a sending module.
CN201010169848A 2010-05-10 2010-05-10 Method and device for controlling user equipment transmitting power in universal mobile telecommunication system Pending CN101868020A (en)

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